Abstract:
A power-diode driver uses a single power source to supply power to the sub-drivers inside. The sub-drivers are well isolated so that they can be safely and easily expanded by connecting to other device or driver. Thus, the power-diode driver has a changeable turn-on time and a highly modulated assembly. And, hence, the present invention is suitable for mass producing reliable power-diode drivers.

Description:
FIELD OF THE INVENTION 
   The present invention relates to a power-diode driver; more particularly, relates to providing inner sub-drivers with power through a single direct current power source and transferring power and control signal in a high speed with the sub-drivers isolated for flexible expansion. 
   DESCRIPTION OF THE RELATED ARTS 
   When a control signal is transferred in an electric/electronic control, a high-power output is usually isolated from control drivers for insulation. The devices used in such a system may include: (1) photo couplers; and, (2) piezoelectric devices. 
   Concerning the photo coupler, its switching frequency is hard to reach over 10 6  hertz; and, thus, a current in a light-emitting diode (LED) within is usually increased to obtain a required frequency. As a result, operation characteristic is changed and the system becomes unstable and its life time is shortened. Besides, the photo coupler needs an independent auxiliary power source at its secondary side. Hence, it is impossible to control multiple photo coupler with a single auxiliary power source for various controls. Such a situation increases inconvenience. And, a driving with a longer turn-on time required is hard to be achieved by the photo coupler too. 
   In the other hand, the piezoelectric device may be designed to use no independent auxiliary power source at its secondary side. However, its best switching frequency for operation is very narrow and is easily affected by the surrounding temperature; and its energy transformation efficiency is not good enough either. Therefore, the piezoelectric device is not suitable to be used with a wide bandwidth or in an environment having wide-range temperature changes. Hence, the prior arts do not fulfill all users&#39; requests on actual use. 
   SUMMARY OF THE INVENTION 
   The main purpose of the present invention is to provide power to inner sub-drivers of a power-diode driver through a single direct current power source and to transfer power and control signal in a high speed, with the sub-drivers isolated for flexible expansion. 
   To achieve the above purpose, the present invention is a power-diode driver having expansible isolated sub-drivers using a single power source, comprising an input, a trigger pulse transformer and an output, coordinated with a plurality of triggers, a plurality of capacitance, a plurality of resistance, a plurality of diodes and a plurality of transistors, where the trigger pulse transformer is a small EE13 driver or an even smaller driver. 
   Therein, the grounded input is connected with a first diode and a parallelly connected first resistance, both of which are connected with a base of a first NPN transistor. The first NPN transistor has a collector connected with a second resistance and a first inverting Schmitt trigger; and an emitter connected with a first capacitance and a parallelly connected third resistance, both of which are grounded. The first inverting Schmitt trigger is connected with a fourth resistance, which is connected with a second diode. The second diode is connected with a second inverting Schmitt trigger, a fifth resistance and a grounded second capacitance. The second inverting Schmitt trigger and the fifth resistance are connected with a third inverting Schmitt trigger. The third inverting Schmitt trigger is connected with a third diode and a parallelly connected sixth resistance, both of which are connected with a base of a second NPN transistor. The second NPN transistor has an emitter connected with an eighth resistance and a third capacitance; and a collector connected with the trigger pulse transformer. And, the eighth resistance and the third capacitance are grounded. 
   Therein, the trigger pulse transformer has a primary side coil connected with a fourth diode and a seventh resistance; and a secondary side coil connected with a sixth diode and a fifth diode. The sixth diode and the fifth diode are connected with a grounded ninth resistance; a fourth capacitance; an emitter of a third PNP transistor; a base of a fourth PNP transistor; and a seventh diode. The fourth capacitance is connected with the emitter of the third PNP transistor; the base of the grounded fourth PNP transistor; and the seventh diode. The third PNP transistor has the emitter connected with the base of the fourth PNP transistor, and the seventh diode; a collector connected with a tenth resistance; and a base connected with a collector of the fourth PNP transistor, a base of a fifth NPN transistor, a twelfth resistance, an eleventh resistance, and the tenth resistance. The seventh diode is connected with an emitter of the fourth PNP transistor; a collector of the fifth NPN transistor; an eighth diode; a fifth capacitance; a sixth capacitance; and a Zener diode. The fifth capacitance, the sixth capacitance and the Zener diode have a parallel connection. The fourth PNP transistor has the base connected with the seventh diode; the emitter connected with the collector of the fifth NPN transistor, the eighth diode, the fifth capacitance, the sixth capacitance, and the Zener diode; and the collector connected with the base of the fifth NPN transistor, the twelfth resistance, the eleventh resistance, and the tenth resistance. The tenth resistance is connected with the base of the fifth NPN transistor, the twelfth resistance and the grounded eleventh resistance. The eleventh resistance is connected with a base of a sixth NPN transistor; and the twelfth resistance. The twelfth resistance is connected with a base of a fifth NPN transistor; a base of a sixth NPN transistor; and a grounded thirteenth resistance. The fifth NPN transistor has the collector connected with the eighth diode, the fifth capacitance, the sixth capacitance, and the Zener diode; and an emitter connected with the eighth diode, a ninth diode, and a collector of the sixth NPN transistor. The sixth NPN transistor has the base connected with the grounded thirteenth resistance; the collector connected with the eighth diode, and the ninth diode; and a grounded emitter. The eighth diode is connected with the fifth capacitance, the sixth capacitance, the Zener diode and the ninth diode. And, the fifth capacitance, the sixth capacitance and the Zener diode are grounded. 
   And, therein, the grounded output is connected with the eighth diode; the ninth diode; the collector of the sixth NPN transistor; and the emitter of the fifth NPN transistor. 
   Accordingly, a novel power-diode driver having expansible isolated sub-drivers using a single power source is obtained, where, through absorbing a counter-electromotive force by the primary side coil of the trigger pulse transformer, a power and a signal are passed to the secondary side coil with a requested voltage. 

   
     BRIEF DESCRIPTION OF THE DRAWING 
     The present invention will be better understood from the following detailed description of the preferred embodiment according to the present invention, taken in conjunction with the accompanying drawing, in which 
       FIG. 1  is the structural view showing the preferred embodiment according to the present invention. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENT 
   The following description of the preferred embodiment is provided to understand the features and the structures of the present invention. 
   Please refer to  FIG. 1 , which is a structural view showing a preferred embodiment according to the present invention. As shown in the figure, the present invention is a power-diode driver having expansible isolated sub-drivers using a single power source, comprising an input  11 , a trigger pulse transformer  12  and an output  13 , coordinated with a plurality of triggers  21 ˜ 23 , a plurality of capacitance  31 ˜ 36 , a plurality of resistance  401 ˜ 413 , a plurality of diodes  51 ˜ 59  and a plurality of transistors  61 ˜ 66 , where the trigger pulse transformer  12  is a transformer smaller than EE13 transformer and each component in the present invention is able to be further connected with resistance, capacitance, inductance, diode and/or transistor to improve applications in actual needs. Through absorbing a counter-electromotive force by the primary side coil  121  of the trigger pulse transformer  12 , a power and a signal are passed to the secondary side coil  122  of the trigger pulse transformer  12  with a requested voltage. 
   The input  11  receives a control signal from a single chip or a control system. A terminal of the input  11  is grounded and another terminal of the input  11  is connected with a first diode  51  and a parallelly connected first resistance  401 . 
   The first diode  51  and the parallelly connected first resistance  401  are connected with a first NPN transistor  61 , where the first NPN transistor  61  is connected with the first diode  51  and the parallelly connected first resistance  52  through a base of the first NPN transistor  61 . 
   The first NPN transistor  61  is connected with a second resistance  402  and a first inverting Schmitt trigger  21  through a collector of the first NPN transistor  61 ; the first NPN transistor  61  is connected with a third resistance  403  and a first capacitance  31  through an emitter of the first NPN transistor  61 ; and the first NPN transistor  61  is used to improve a transformation efficiency between high and low potentials of a current. 
   The first inverting Schmitt trigger  21  is connected with a fourth resistance  404 , where the first inverting Schmitt trigger  21  is used to make the phase of the signal turned back to the same phase of the signal inputted from the input  11 . 
   The fourth resistance  404  is connected with a second diode  52 . 
   The second diode  52  is connected with a second inverting Schmitt trigger  22 , a fifth resistance  405  and a second capacitance  32 , where a terminal of the second capacitance  32  is grounded and the second inverting Schmitt trigger  22  produces a high-frequency oscillation through a charging and a discharging by the fifth resistance  405  and the second capacitance  32 . The second inverting Schmitt trigger  22  and the fifth resistance  405  are connected with a third inverting Schmitt trigger  23 , where the third inverting Schmitt trigger  23  is used to change a wave form of the signal to obtain a reverse phase toward the phase of the signal inputted from the input  11 . 
   The third inverting Schmitt trigger  23  is connected with a third diode  53  and a parallelly connected sixth resistance  406 . 
   The third diode  53  and the parallelly connected sixth resistance  406  are connected with a second NPN transistor  62 , where the second NPN transistor  62  is connected with the third diode  53  and the sixth resistance  406  through a base of the second NPN transistor  62 . 
   The second NPN transistor  62  is used to drive coils to pass energy and signal through a current heightened. The second NPN transistor  62  is connected with an eighth resistance  408  and a third capacitance  33  through an emitter of the second NPN transistor  62 , where the eighth resistance  408  and the third capacitance  33  have a parallel connection and are grounded. And, the second NPN transistor  62  is connected with the trigger pulse transformer  12  through a collector of the second NPN transistor  62 . 
   The trigger pulse transformer  12  is connected with a fourth diode  54  and a seventh resistance at a primary side coil  121  of the trigger pulse transformer  12 ; and the trigger pulse transformer  12  is connected with a fifth diode  55  and a sixth diode  56  at a secondary side coil  122  of the trigger pulse transformer  12 . 
   The fifth diode  55  and the sixth diode  56  are connected together to be connected with a ninth resistance  409 , a fourth capacitance  34 , a third PNP transistor  63 , a seventh diode  57  and a fourth PNP transistor  64 , where a terminal of the ninth resistance  409  and a terminal of the fourth capacitance  34  are grounded; the third PNP transistor  63  is connected with the fifth diode  55  and the sixth diode  56  through an emitter of the third PNP transistor  63 ; and the fourth PNP transistor  64  is connected with the fifth diode  55  and the sixth diode  56  through a base of the fourth PNP transistor  64 . 
   The third PNP transistor  63  is connected with the ninth resistance  409 , the fourth capacitance  34 , the seventh diode  57  and the fourth PNP transistor  64  through the emitter of the third PNP transistor  63 ; the third PNP transistor  63  is connected with the fourth PNP transistor  64 , a fifth NPN transistor  65 , a twelfth resistance  412 , an eleventh resistance  411  and a tenth resistance  410  through a base of the third P NP transistor  63 ; and the third PNP transistor  63  is connected with the tenth resistance  410  through a collector of the third PNP transistor  63 , where the fourth PNP transistor  64  is connected with the emitter of the third PNP transistor  63  through the base of the fourth PNP transistor  64 ; the fourth PNP transistor  64  is connected with the base of the third PNP transistor  63  through the collector of the fourth PNP transistor  64 ; and the fifth NPN transistor  65  is connected with the base of the third PNP transistor  63  through the base of the fifth NPN transistor  64 . 
   The seventh diode  57  is connected with the fourth PNP transistor  64 , the fifth NPN transistor  65 , the eighth diode  58 , a fifth capacitance  35 , a sixth capacitance  36  and a Zener diode  14 , where the fifth capacitance  35 , the sixth capacitance  36  and the Zener diode  14  are parallelly connected; the fourth PNP transistor  64  is connected with the seventh diode  57  through the base and an emitter of the fourth PNP transistor  64 ; the fifth NPN transistor  65  is connected with the seventh diode  57  through a collector of the fifth NPN transistor  65 ; and the fifth capacitance  35 , the sixth capacitance  36  and the Zener diode  14  are grounded. 
   The fourth PNP transistor  64  is connected with the fifth NPN transistor  65 , the eighth diode  58 , the fifth capacitance  35 , the sixth capacitance  36  and the Zener diode  14  through the emitter of the fourth PNP transistor  64 ; and the fourth PNP transistor  64  is connected with the tenth resistance  410 , the eleventh resistance  411 , the twelfth resistance  412  and the fifth NPN transistor  65  through the collector of the fourth PNP transistor  64 , where the fifth NPN transistor  65  is connected with the collector of the fourth PNP transistor  64  through the base of the fifth NPN transistor  65 ; and the fifth NPN transistor  65  is connected with the emitter of the fourth PNP transistor  64  through the collector of the fifth NPN transistor  65 . 
   The tenth resistance  410  is connected with the fifth NPN transistor  65 , the twelfth resistance  412  and the eleventh resistance  411 , where the fifth NPN transistor  65  is connected with the tenth resistance  410  through the base of the fifth NPN transistor  65 ; and the eleventh resistance  411  is grounded. 
   The twelfth resistance  412  is connected with a sixth NPN transistor  66  and a thirteenth resistance  413 , where the sixth NPN transistor  66  is connected with the twelfth resistance  412  through a base of the sixth NPN transistor  66 ; and the thirteenth resistance  413  is grounded. 
   The fifth NPN transistor  65  is connected with the eighth diode  58 , the fifth capacitance  35 , the sixth capacitance  36  and the Zener diode  14  through the collector of the fifth NPN transistor  65 ; the fifth NPN transistor  65  is connected with the twelfth resistance  412  and the eleventh resistance  411  through the base of the fifth NPN transistor  65 ; and the fifth NPN transistor  65  is connected with the eighth diode  58 , a ninth diode  59  and the sixth NPN transistor  66  through an emitter of the fifth NPN transistor  65 , where the sixth NPN transistor  66  is connected with the eighth diode  58  through a collector of the sixth NPN transistor  66 ; and the sixth NPN transistor  66  is connected with the emitter of the fifth NPN transistor  65  through the collector of the sixth NPN transistor  66 . 
   The eighth diode  58  is connected with the sixth NPN transistor  66 , the ninth diode  59 , the fifth capacitance  35 , the sixth capacitance  36  and the Zener diode  14 , where the ninth diode  59 , the fifth capacitance  35 , the sixth capacitance  36  and the Zener diode  14  are grounded. 
   And, the sixth NPN transistor  66  is connected with the thirteenth resistance  413  through the base of the sixth NPN transistor  66 ; and the sixth NPN transistor  66  is grounded through an emitter of the sixth NPN transistor  66 . 
   A terminal of the output  13  is connected with the ninth diode  59 , the eighth diode  58 , the fifth NPN transistor  65  and the sixth NPN transistor  66 , where the fifth NPN transistor  65  and the sixth NPN transistor  66  are connected with the output  13  through the emitter of the fifth NPN transistor  65  and the collector of the sixth NPN transistor  66 , respectively. And, another terminal of the output  13  is grounded. 
   Thus, a novel expansible isolated power-diode driver using a single power source is obtained through the above structure. 
   When the signal is inputted from the input  11  by the single chip or the control system, the first NPN transistor  61  enhances the transformation efficiency between high and low potentials of the current; and a low voltage of the current is transformed into a high voltage. Because the phase at the collector is reverse to the phase at the base, the first inverting Schmitt trigger  21  is used to return the phase of the signal to the original phase of the signal inputted from the input  11 . The second inverting Schmitt trigger  22  produces a high-frequency oscillation through a charging and a discharging by the fifth resistance  405  and the second capacitance  32 , respectively. Then, the second inverting Schmitt trigger  22  outputs a low potential when the voltage is high; or, reversely, the second inverting Schmitt trigger  22  outputs a high potential when the voltage is low. Therein, the oscillation has a high frequency more than 10 6  hertz; and, after the wave form of the signal is changed by the third inverting Schmitt trigger  23 , a phase reverse to the phase of the inputted signal is obtained with the high frequency. The second NPN transistor  62  heightens the current to drive the coils of the trigger pulse transformer  12  to pass the energy. Under the high transformation efficiency between high and low potentials of the current, when the second NPN transistor  62  is closed, a very high counter-electromotive force is produced. At the moment, a circuit protection is provided by the fourth diode  54  and the seventh resistance  407 , where the counter-electromotive force is absorbed by the primary side coil  121  to be passed to the secondary side coil. Thus, the energy is fully used; an efficiency of the whole circuit is enhanced; and, a reacting time of the whole circuit is improved. 
   In addition, a circuit is designed in the present invention to modify the wave form at the secondary side coil  122  into a standard square waveform. 
   In the present invention, each NPN transistor  61 ,  62 ,  65 ,  66  can be replaced by a field-effect transistors (FET), a metal-oxide semiconductor (MOS) or a complementary metal-oxide semiconductor (CMOS). Therein, the voltage at the sixth capacitance  36  is taken as a standard potential of a direct current to be compared with the voltage at the fourth capacitance  34 . When the voltage at the fourth capacitance  34  is higher than the voltage at the sixth capacitance  36 , the seventh diode  57  and the third PNP transistor  63  are turned on and the fourth PNP transistor is turned off, while the eleventh resistance  411  provides a voltage to turn on the fifth NPN transistor  65 . Hence, when the fifth NPN transistor  65  is a metal oxide semiconductor field effect transistor (MOSFET) for example, a gate of the MOSFET is rapidly heightened to a high potential. On the contrary, when the voltage at the fourth capacitance  34  is lower than the voltage at the sixth capacitance  36 , the seventh diode  57  and the third PNP transistor  63  a returned off and the fourth PNP transistor is turned on, while the thirteenth resistance  413  provides a voltage to turn on the sixth NPN transistor  65 . Then, when the fifth NPN transistor  65  is a MOSFET for example, a gate of the MOSFET is rapidly lowered to a low potential. Hence, with the above structure, a transistor driver according to present invention is improved in efficiency. In addition, each electric component in the present invention can be further connected with a resistance, a capacitance, an inductance, a diode and/or a transistor to enhance performance in an actual need, like matching. 
   To sum up, the present invention is a power-diode driver having expansible isolated sub-drivers using a single power source, where a single direct current power source is required to provide inner sub-drivers with power and to transfer power and control signal in a high speed; and the present invention is suitable for mass production and has a high reliability with a changeable turn-on time and a high-modulated assembly. 
   The preferred embodiment herein disclosed is not intended to unnecessarily limit the scope of the invention. Therefore, simple modifications or variations belonging to the equivalent of the scope of the claims and the instructions disclosed herein for a patent are all within the scope of the present invention.