Patent Publication Number: US-9844110-B1

Title: Current adjustment apparatus for LED lighting fixture

Description:
BACKGROUND 
     Technical Field 
     The present disclosure relates to a driving apparatus. More particularly, the present disclosure relates to a driving current adjustment apparatus for LED lighting fixture. 
     Description of Related Art 
     A light emitting diode (LED) is a kind of semiconductor device, which exploits the property of direct-bandgap semiconductor material to convert electric energy into light energy efficiently and has advantages of long lifetime, high stability, and low power consumption, and the LED is widely used in indoor and outdoor lighting and developed to replace the traditional non-directivity fluorescent lamp, gas discharge lamp (such as HID lamp), and incandescent lamp. 
     The LED-based lighting fixture (hereafter “the LED lighting fixture”) may be driven by an LED driver which may convert input power, for example, utility alternative current (AC) power, into required form for use by the LED lighting fixture. Commonly, the LED lighting fixtures with different illuminance require different power specifications, hence a manufacturer have to manufacture a large number of different LED drivers just to meet the requirements of different power specifications; however, it consumes lots of money and elongates the development time. 
     SUMMARY 
     In view of the above, this disclosure discloses a current adjustment apparatus for LED lighting fixture, capable of adjusting current in correspondence to the required power specification to lower development cost and time. 
     According to one aspect of the present disclosure, the current adjustment apparatus for LED lighting fixture includes a communication interface, a current generating module, and a current adjustment module; the current generating module includes a microprocessor, a memory, and a current generating unit; the memory is electrically connected to the microprocessor and configured to store a current setting parameter; the current generating unit is electrically connected to the microprocessor and configured to generate a driving current for driving the LED lighting fixture. The current adjustment module is configured to generate a setting signal and a writing signal. The microprocessor makes the current generating unit generate the driving current with particular level in response to the current setting parameter when the current adjustment module is not physically connected to the current generating module; the microprocessor makes the current generating unit generate the driving current with another particular level in accordance with the setting signal when the current generating module is physically connected to the current adjustment module and the microprocessor receives the setting signal via the communication interface; and the microprocessor further overwrites the current setting parameter in accordance with the setting signal when the microprocessor receives the writing signal via the communication interface. 
     In the present disclosure, the current adjustment module may adjust the driving current generated by the current generating module, hence the current adjustment apparatus for the LED lighting fixture may be widely used in LED lighting fixtures with different power specifications, and has advantages of lowering the development time and cost. 
    
    
     
       BRIEF DESCRIPTION OF DRAWING 
       Embodiment of the present disclosure will be described by way of example embodiment, but not limitations, illustrated in the accompanying drawings in which like references denote similar elements, and in which: 
         FIG. 1  is a circuit block diagram of a current adjustment apparatus for light emitting diode (LED) lighting fixture according to a 1st embodiment of the present disclosure; 
         FIG. 2  is a circuit block diagram of a current generating unit of the current adjustment apparatus for LED lighting fixture according to the 1st embodiment of the present disclosure; 
         FIG. 3  is a timing diagram of a current adjustment module of the current adjustment apparatus for LED lighting fixture according to the 1st embodiment of the present disclosure; 
         FIG. 4  is a circuit block diagram of a current adjustment apparatus for LED lighting fixture according to a 2nd embodiment of the present disclosure; 
         FIG. 5  is a circuit block diagram of a current adjustment apparatus for LED lighting fixture according to a 3rd embodiment of the present disclosure; 
         FIG. 6  is a circuit block diagram of a current adjustment apparatus for LED lighting fixture according to a 4th embodiment of the present disclosure; and 
         FIG. 7  is a circuit block diagram of a current adjustment apparatus for LED lighting fixture according to a 5th embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Reference is made to  FIG. 1 , which is a circuit block diagram of a current adjustment apparatus for light emitting diode (LED) lighting fixture according to a 1st embodiment of the present disclosure. In  FIG. 1 , the current adjustment apparatus for LED lighting fixture  1  is configured to drive an LED lighting fixture  3  including one or more white and/or multicolored LEDs  30  with specific parameters. 
     The current adjustment apparatus for LED lighting fixture  1  includes a communication interface  12 , a current generating module  14 , and a current adjustment module  16 , and the current generating module  14  is interconnected with the current adjustment module  16  by the communication interface  12  consolidating data transmissions and power delivery; the current generating module  14  and the current adjustment module  16  may be communicated with each other via the communication interface  12 . 
     The communication interface  12  is a wire-based interface and may be a universal serial bus (USB) interface. In addition, the communication interface  12  includes a connector plug  122  and a mating port  124  configured to mate with the connector plug  122 , and the mating of the connector plug  122  and the mating port  124  supports communications via a USB interface. In  FIG. 1 , the connector plug  122  is arranged on the current adjustment module  16 , and the mating port  124  is arranged on the current generating module  14 , the mating of the connector plug  122  and the mating port  124  provides a communication between the current adjustment module  16  and the current generating module  14 . As used herein, mating the connector plug  122  with the mating port  124  refers to providing a physical connection (or called mechanical connection). 
     The current generating module  14  includes a memory  142 , a microprocessor  144 , and a current generating unit  146 ; the memory  142  is configured to store a current setting parameter and may be, for example, an electrically-erasable programmable read-only memory (EEPROM) or flash memory. 
     The microprocessor  144  is electrically connected to the memory  142  and the current generating unit  146 ; the microprocessor  144  is further electrically connected to the mating port  124  via the path  145 . The path  145  may represent one or more components, which may include (processing) components that convey electrical signals between the microprocessor  144  and the mating port  124 . The microprocessor  144  is, for example, a pulse width modulator configured to generate a pulse width modulating (PWM) signal for the current generating unit  146 . 
     The current generating unit  146  is configured to generate a driving current Tout in response to the PWM signal sent from the microprocessor  144 . The LED lighting fixture  3  is connected to the current generating unit  146  and receives the driving current Iout generated by the current generating unit  146 . 
     Reference is made to  FIG. 2 , which is a circuit block diagram of the current generating unit according to the 1st embodiment of the present disclosure. In  FIG. 2 , the current generating unit  146  includes an alternating current (AC)/direct current (DC) converter  1460  and a DC/DC converter  1462 ; the AC/DC converter  1460  is electrically connected to a power supply terminal  5  for receiving an AC power from the power supply terminal  5  and convert the AC power into a DC power. The DC/DC converter  1462  electrically connected to the AC/DC converter  1460  and the microprocessor  144  is configured to step up/step down the DC power and adjust the level of the driving current Tout in accordance with a duty cycle of the PWM signal generated by the microprocessor  144 . 
     With referring again to  FIG. 1 ; when the current generating module  14  is not physically connected to the current modulating module  16 , the microprocessor  144  generates the PWM signal with particular duty cycle in accordance with the current setting parameter stored in the memory  142 , and the current generating unit  146  then outputs the driving current Tout with particular level in response to the duty cycle of the PWM signal. 
     The current adjustment module  16  includes a setting signal generator  162  and a write-erase unit  164 ; the setting signal generator  162  is configured to generate a setting signal. The setting signal generator  162  may be an active component (such as microprocessor or IC) or a passive component (such as one or more resistors or Dip switches), and may generate, for example, one or more DC voltage signals, DC current signals, PWM signals, digital logic signals or any other form of electrical signals. The setting signal generator  162  may be electrically connected to the connector plug  122  via the path  163 ; the path  163  may represent one or more components, which may include processing components that convey electrical signals between the setting signal generator  162  and the connector plug  122 . 
     The write-erase unit  164  may generate a writing signal or an erase signal in accordance with a trigger instruction. The write-erase unit  164  is electrically connected to the connector plug  122  via the path  165 ; the path  165  may represent one or more components, which may include processing components that convey electrical signals between the write-erase unit  164  and the connector plug  122 . 
     When the current adjustment module  16  is physically connected to the current generating module  14  via the connected connector plug  122  and the mating port  124 , the microprocessor  144  receives the setting signal from the setting signal generator  162  and modulates the duty cycle of the PWM signal in accordance with the setting signal, thus the level of the driving current Tout outputted from the current generating unit  146  is adjusted. 
     It should be noted that the microprocessor  144  may preferentially modulate the duty cycle of the PWM signal in accordance with the setting signal when the current adjustment module  16  and the current generating module  14  are physically connected and communicated with each other via the USB interface; in the other words, the microprocessor  144  may be no longer modulate the duty cycle of the PWM signal in accordance with the current setting parameter stored in the memory  142  when the current modulating module  16  is physically connected to the current generating module  14 . 
     Additionally, the microprocessor  144  may receive a writing signal provided by the write-erase unit  164  after the current adjustment module  16  is physically connected to the current generating module  14  and communicated with the current generating module  14  via the USB interface; after the microprocessor  144  receives the writing signal, it overwrites the current setting parameter stored in the memory  142  in accordance with the setting signal to produce a new current setting parameter. 
     As mentioned previously the microprocessor  144  may modulate the duty cycle of the PWM signal in response to the current setting parameter when the current generating module  14  is not physically connected to the current adjustment module  16 ; thus after the microprocessor  144  overwrites the current setting parameter in accordance with the setting signal, even if the current adjustment module  16  is separated from the current generating module  14 , the duty cycle of the PWM signal generated by the microprocessor  144  is the same as that of the PWM signal while the current adjustment module  16  is physically connected to the current generating module  14 . To put it differently, after the microprocessor  144  successfully overwrites the current setting parameter in accordance with the setting signal, the level of the driving current Tout will not be changed when the current generating module  14  and the current adjustment module  16  are separated. 
     Furthermore, the microprocessor  144  may receive an erase signal provided by the write-erase unit  164  while the current adjustment module  16  is physically connected to the current generating module  14  and communicated with the current generating module  14  via the USB interface. When the current adjustment module  16  is physically connected to the current generating module  14 , the microprocessor  144  modulates the duty cycle of the PWM signal in accordance with the setting signal from the current adjustment module  16  to adjust the level of the driving current Tout; in the meanwhile, the microprocessor  144  further erases the current setting parameter stored in the memory  142  to reset to a factory default. Thereafter, when the current adjustment module  16  is separated from the current generating module  14 , the microprocessor  144  will modulate the duty cycle of the PWM signal in response to the factory default to adjust the level of the driving current Tout. It should be noted that the maximum level of the driving current Tout is occurred when current setting parameter is reset to the factory default. 
     In the present disclosure, the write-erase unit  164  is, for example, a normally open pressed switch. The write-erase unit  164  is configured to generate the writing signal or the erase signal in accordance with duration of the trigger instruction. Reference is made to  FIG. 3 ; when the duration of the trigger instruction continues for a first predetermined time length t 1  (such as 1 second), a writing signal is generated; when the duration of the trigger instruction exceeds a second predetermined time length t 2  (such as 4 seconds), the erase signal is generated; wherein the second predetermined time length t 2  is longer than the first predetermined time length t 1 . In the other words, the write-erase unit  164  may generate the writing signal when the duration of the trigger instruction is longer than the first predetermined time length t 1  but less than the second predetermined time length t 2 . The first predetermined time length t 1  is used for preventing user from triggering the writing signal inadvertently. 
     With referring again to  FIG. 1 ; the current adjustment module  16  may further include an indicator  166  electrically connected to the connector plug  122  via the path  167 . The indicator  166  is, for example, an LED. The path  167  may represent one or more components, which may include processing components that convey an electrical signal between the indicator  166  and the connector plug  122 . The microprocessor  144  may generates a (high level) response signal after receiving the writing signal and successfully overwriting the current setting parameter, as shown in  FIG. 3 . The (high level) response signal is transmitted to the current adjusting module  16  from the microprocessor  144  via the communication interface  12  and indicated by the indicator  166 , thus user may know that the current setting parameter is successfully overwritten in accordance with the setting signal. Besides, the microprocessor  144  may stop generating the response signal or generate a low level response signal (as shown in  FIG. 3 ) after receiving the erase signal and successfully resetting the current setting parameter to the factory default; thereafter, the indicator  166  may stop indicating, thus user may know that the current setting parameter is successfully reset to the factory default. 
     It should be noted that the microprocessor  144  may generate the response signal (with high level) when the current setting parameter stored in the memory  142  is not reset to the factory default. As mentioned previously the microprocessor  144  may generate the (high level) response signal after the current setting parameter is overwritten in accordance with the setting signal to make the indicator  166  to indicate the response signal; that is to say, the microprocessor  144  may generate the (high level) response signal to drive the indicator  166  to indicate the response signal before it receive the erase signal and reset the current setting parameter to the factory default. That is to say, the microprocessor  144  may generate the (high level) response signal to drive the indicator  166  to indicate the response signal and inform user that the current setting parameter is not reset to the factory default even if the current adjustment module  16  is again physically reconnected to the current generating module  14  after being separated from it. Besides, the current adjustment module  16  may overwrite the current setting parameter stored in the memory  142  in accordance with the setting signal or reset the current setting parameter to the factory default while the current generating module  14  being powered on. When the current generating module  14  is under powered on condition, it may generate the driving current Tout for the LED lighting fixture  3  in response to the current setting parameter when it is not physically connected to the current adjustment module  16 . 
     The current generating unit  146  may electrically connected to the mating port  124  via the path  147 , and when the current adjustment module  16  is physically connected to the current generating module  14  via the communication interface  12 , the current generating unit  146  supplies an operation power to the current adjustment module  16  using USB power delivery protocol. Thereafter the write-erase unit  164  of the current adjustment module  16  may generate the writing signal or the erase signal in accordance with the duration of the trigger instruction, and the indicator  166  may indicate the response signal from the microprocessor  144 . The path  147  may represent one or more components, which may include processing components that convey electrical signals between the current generating unit  146  and the mating port  124 . 
     Moreover, the current adjustment module  16  may overwrite the current setting parameter stored in the memory  142  in accordance with the setting signal or reset the current setting parameter to the factory default when the current generating module  14  being powered off. When the current generating module  14  is under powered off condition, the current generating unit  146  cannot supply the operation power to the current adjustment module  16  via the path  147  (namely the path  147  may be not existed in the current generating module  14 ) and generate the driving current Tout for the LED lighting fixture  3 . Accordingly, a power supply  18  (as shown in  FIG. 4 ) may be provided to supply operation power to the current adjustment module  16  and the current generating module  14 . 
       FIG. 4  is a circuit block diagram of a current adjustment apparatus for LED lighting fixture according to a 2nd embodiment of the present disclosure. In  FIG. 4 , the power supply  18  may supply DC operation power for processing an off-line burning procedure. The power supply  18  may be physically connected to the current adjustment module  16  by mating a plug connector  190  of a cable assembly  19  connected to the power supply  18  with a mating port  168  of the current adjustment module  16 . When the plug connector  190  is mated with the mating port  168 , the power supply  18  may supply the DC operation power to the current adjustment module  16  using USB power delivery protocol. 
     In addition, the mating port  168  may be electrically connected to the connector plug  122  via the path  169 ; therefore the power supply  18  may further conduct the DC operation power to the current generating module  14  using USB power delivery protocol to power the memory  142  and the microprocessor  144 . The path  169  may represent one or more components, which may include processing components that convey electrical signals between the mating port  168  and the connector plug  122 . Therefore, the write-erase unit  164  of the current adjustment module  16  may generate the writing signal or the erase signal in accordance with the duration of the trigger instruction, the microprocessor  144  may overwrite the current setting parameter stored in the memory  142  in accordance with the setting signal or reset the current setting parameter to the factory default in accordance with the erase signal, and the indicator  166  may indicate the response signal from the microprocessor  144 . 
     Reference is made to  FIG. 5 , which is a circuit block diagram of a current adjustment apparatus for LED lighting fixture according to a 3rd embodiment of the present disclosure. In  FIG. 5 , the current adjustment apparatus for LED lighting fixture  1  includes a communication interface  12 , a plurality of current generating modules  14 - 1 ˜ 14 - n , and a current adjustment module  16 ; wherein n is an integral. The scheme of each of the current generating modules  14 - 1 ˜ 14 - n  is the same as the current generating module  14  shown in  FIG. 4  mentioned above and is not repeated here for brevity. The current adjustment module  16  shown in  FIG. 5  may overwrite the current setting parameter(s) stored in the memories  142  of the current generating modules  14 - 1 ˜ 14 - n  in accordance with the setting signal or reset the current setting parameter(s) stored in the memories  142  of the current generating modules  14 - 1 ˜ 14 - n  to the factory default in accordance with the erase signal. 
     The current generating modules  14 - 1 ˜ 14 - n  are physically connected to the current adjustment module  16  via the communication interface  12 , which allows data and power delivering between the current generating modules  14 - 1 ˜ 14 - n  and the current adjustment module  16 . The communication interface  12  is a wire-based interface and may be a universal serial bus (USB) interface. In  FIG. 5 , the communication interface  12  includes a plurality of mating ports  122 - 1 ˜ 122 - n  respectively arranged on the current adjustment module  16 , a plurality of mating ports  124 - 1 ˜ 124 - n  respectively arranged on the current generating modules  14 - 1 ˜ 14 - n , and a plurality of cables  126 - 1 ˜ 426 - n.    
     The mating ports  122 - 1 ˜ 122 - n  are respectively mated with connector plugs  1260 - 1 ˜ 1260 - n  arranged at one end of the cables  126 - 1 ˜ 126 - n , and the mating ports  124 - 1 ˜ 124 - n  are respectively mated with connector plugs  1262 - 1 ˜ 1262 - n  arranged at the other end of the cables  126 - 1 ˜ 126 - n ; the mating of the mating ports  122 - 1 ˜ 122 - n  and the connector plugs  1260 - 1 ˜ 1260 - n , and the mating of the connector plugs  1262 - 1 ˜ 1262 - n  and the mating ports  124 - 1 ˜ 124 - n  support communications via a USB interface. 
     The current adjustment module  16  includes a setting signal generator  162 , a write-erase unit  164 , and a plurality of indicators  166 - 1 ˜ 166 - n . The setting signal generator  162  is configured to generate a setting signal and electrically connected to the mating ports  122 - 1 ˜ 122 - n  via the path  163 . The write-erase unit  164  is configured to generate a writing signal or an erase signal in accordance with duration of the trigger instruction. The write-erase unit  164  is electrically connected to the mating ports  122 - 1 ˜ 422 - n  via the path  165 . The indicators  166 - 1 ˜ 166 - n  are electrically connected to the mating ports  122 - 1 ˜ 122 - n  via the paths  167 - 1 ˜ 167 - n , respectively. An amount of the indicators  166 - 1 ˜ 166 - n  is the same as an amount of the current generating modules  14 - 1 ˜ 14 - n , and the indicators  166 - 1 ˜ 166 - n  are configured to indicate the response signal and inform user that the current setting parameter(s) stored in the memories  142  are overwritten in accordance with the setting signal from the current adjustment module  16  or the current setting parameter(s) are reset to the factory default(s) in accordance with the erase signal. 
     The microprocessors  144  may generate the (high level) response signal after receiving the writing signal and successfully overwriting the current setting parameter(s) in accordance with the setting signal; the (high level) response signal is then transmitted to the current adjustment module  16  via the communication interface  12  for driving the corresponding indicators  166 - 1 ˜ 166 - n  to indicate the response signal and inform user that the current setting parameter(s) stored in the memories  142  are overwritten in accordance with the setting signal. Besides, after the microprocessors  144  of the current generating modules  14 - 1 ˜ 14 - n  receive the erase signal from the current adjustment module  16  and successfully reset the current setting parameter(s) to the factory default, the microprocessors  144  may stop generating the response signal or generate the response signal with low level to make the corresponding indicators  166 - 1 ˜ 166 - n  stop indicating the response signal, thus user may know that the current setting parameter(s) are reset to the factory default. 
     The current adjustment apparatus  1  shown in  FIG. 5  may further includes a power supply  18  physically connected to the current adjustment module  16  via a connector plug  190  of a cable assembly  19  and the mating port  168  of the current adjustment module  16 . When the connector plug  190  is mated with the mating port  168 , the power supply  18  may supply an operation power to the current adjustment module  16  using USB power delivery protocol. 
     The mating port  168  may further electrically connected to the mating ports  122 - 1 ˜ 122 - n  via the path  169 , thus the operation power may be supplied to the current generating modules  14 - 1 ˜ 14 - n  using USB power delivery protocol for powering the memories  142  and the microprocessors  144 . Thereafter, the write-erase unit  164  of the current adjustment module  16  may generate the writing signal or the erase signal in accordance with the duration of the trigger instruction to make the microprocessor  144  overwrite the current setting parameter(s) stored in the memories  142  in accordance with the setting signal or reset the current setting parameter(s) to the factory default in accordance with the erase signal, and the indicators  166 - 1 ˜ 166 - n  may indicate the response signal from corresponding microprocessor(s)  144 . 
     Reference is made to  FIG. 6 , which is a circuit block diagram of a current adjustment apparatus for LED lighting fixture according to a 4th embodiment of the present disclosure. In  FIG. 6 , the current adjustment apparatus for LED lighting fixture  1  includes a communication interface  12 , a current generating module  14 , and a current adjustment module  16 ; the current generating module  14  is interconnected with the current adjustment module  16  by the communication interface  12  consolidating data transmissions and power delivery; the current generating module  14  and the current adjustment module  16  may be communicated with each other via the communication interface  12 . 
     The communication interface  12  is a wire-based interface and may be a universal serial bus (USB) interface. The communication interface  12  includes a connector plug  122  and a mating port  124  configured to mate with the connector plug  122 , and the mating of the connector plug  122  and the mating port  124  supports communications via a USB interface. In  FIG. 6 , the connector plug  122  is arranged on the current adjustment module  16 , and the mating port  124  is arranged on the current generating module  14 , the mating of the connector plug  122  and the mating port  124  provides a communication between the current adjustment module  16  and the current generating module  14 . As used herein, mating the connector plug  122  with the mating port  124  refer to providing a physical connection. 
     The current generating module  14  includes a memory  142 , a microprocessor  144 , and a current generating unit  146 ; the memory  142  is electrically connected to the microprocessor  144  and configured to store a current setting parameter. 
     The microprocessor  144  is electrically connected to the memory  142  and the current generating unit  146 ; the microprocessor  144  is, for example, a pulse width modulator configured to modulate a duty cycle of a pulse width modulating (PWM) signal in response to the current setting parameter stored in the memory  142  or in accordance with a setting signal form the current adjustment module  16 . More particular, the microprocessor  144  may modulate the duty cycle of the PWM signal in response to the current setting parameter form the memory  142  when the current generating module  14  is not physically connected to the current adjustment module  16 ; on the contrary, when the current generating module  14  is physically connected to the current adjustment module  16 , the microprocessor  144  may modulate the duty cycle of the PWM signal in accordance with the setting signal form the current adjustment module  16 . 
     The current generating unit  146  receives the PWM signal generated by the microprocessor  144  and generates a driving current Iout in accordance with the PWM signal. The LED lighting fixture  3  is connected to the current generating unit  146  for receiving the driving current Iout from the current generating unit  146 . 
     The current adjustment module  16  is configured to generate the setting signal, a writing signal, and an erase signal and indicate a response signal from the current generating module  14 . In  FIG. 6 , the current adjustment module  16  includes a user interface (UI) allows controlling operations of the current adjustment module  16  and is, for example, includes an input unit  1602  and a display  1604  with appropriate form for user. 
     The input unit  1602  may include appropriate component(s), such as buttons, keypad or the combination thereof, for providing user of the current adjustment module  16  to input controlling information (including, but not limited to, a setting signal, a writing signal, and an erase signal). 
     The display  1604  may include appropriate components for providing display functionality to the user of the current adjustment module  16 , wherein the display  1604  may show information inputted by user or a response signal from the current generating module  14 . Additionally, the current adjustment module  16  may be a touch-sensitive display consolidating input functionality providing by the input unit  1602  and display functionality providing by the display  1604 , and user may input the setting signal, the writing signal, and the erase signal thereby. 
     When the current adjustment module  16  is physically connected to the current generating module  14  via the connector plug  122  and the mating port  124 , the microprocessor  144  receives the setting signal from the current adjustment module  16  and modulates the duty cycle of the PWM signal in accordance with the setting signal, thus the level of the driving current Tout outputted from the current generating unit  146  is adjusted. It should be noted that the current generating module  14  may electrically connected to the mating port  124  via the path  147 , hence when the current adjustment module  16  is physically connected to the current generating module  14 , the current generating module  14  may supply an operation power to the current adjustment module  16  using USB power delivery protocol. In addition, the microprocessor  144  may receive the writing signal provided by the current adjustment module  16  when the current adjustment module  16  is physically connected to the current generating module  14  and communicate with the current generating module  14  via the USB interface; after the microprocessor  144  receives the writing signal, it overwrites the current setting parameter stored in the memory  142  in accordance with the setting signal to produce a new current setting parameter. 
     Furthermore, the microprocessor  144  may receive an erase signal provided by the current adjustment module  16  while the current adjustment module  16  is physically connected to the current generating module  14 . After that, the microprocessor  144  modulates the duty cycle of the PWM signal in accordance with the setting signal from the current adjustment module  16  to adjust the level of the driving current Tout; in the meanwhile, the microprocessor  144  further erases the current setting parameter stored in the memory  142  to reset to a factory default. Thereafter, when the current adjustment module  16  is separated from the current generating module  14 , the microprocessor  144  will modulate the duty cycle of the PWM signal in response to the factory default to adjust the level of the driving current Tout. It should be noted that the maximum level of the driving current Tout is occurred when current setting parameter is reset to the factory default. 
     The current adjustment apparatus for the LED lighting fixture  1  shown in  FIG. 6  is mainly configured to overwrite the current setting parameter stored in the memory  142  in accordance with the setting signal or reset the current setting parameter to the factory default in accordance with the erase signal when the current generating module  14  is under powered on condition; however, in the practical application, the current adjustment apparatus for the LED lighting fixture  1  may overwrite the current setting parameter stored in the memory  142  in accordance with the setting signal or reset the current setting parameter to the factory default when the current generating module  14  is under powered off condition (namely providing an off-line burning functionality). 
     Reference is made to  FIG. 7 , which is a circuit block diagram of a current adjustment apparatus for LED lighting fixture according to a 5th embodiment of the present disclosure. In  FIG. 7 , the current adjustment apparatus for LED lighting fixture  1  includes a communication interface  12 , a current generating module  14 , and a current adjustment module  16 , and the scheme of the communication interface  12  and the current generating module  14  are the same as the communication interface  12  and the current generating module  14  shown in  FIG. 6  mentioned above and is not repeated here for brevity. 
     The current adjustment module  16  includes a user interface (UI)  160  and a battery  161 ; the user interface  160  allows controlling operations of the current adjustment module  16  and, for example, includes an input unit  1602  and a display  1604 . The battery  161  not only supplies an operation power to the user interface  160 , but also supplies a DC power to the current generating module  14  using USB power delivery protocol. 
     Therefore, the input unit  1602  of the user interface  160  may generate the writing signal or the erase signal in accordance with a duration of the trigger instruction, the microprocessor  144  of the current generating module  14  may overwrite the current setting parameter stored in the memory  142  in accordance with the setting signal or reset the current setting parameter to the factory default in accordance with the erase signal, and the display  1604  of the current adjustment module  16  may display the response signal from the microprocessor  144 . 
     Although the present disclosure has been described with reference to the foregoing preferred embodiment, it will be understood that the disclosure is not limited to the details thereof. Various equivalent variations and modifications can still occur to those skilled in this art in view of the teachings of the present disclosure. Thus, all such variations and equivalent modifications are also embraced within the scope of the disclosure as defined in the appended claims.