Abstract:
The present invention discloses a driver for amplifying an operating voltage of a low driving-voltage luminary. The driver includes a driving circuit providing a first signal, and a negative multiple voltage circuit electrically connected to the driving circuit and the luminary respectively for transforming the first signal into a second signal to be transmitted to the luminary, thereby the luminary being driven in response to the second signal. The luminary circuit is connected between power source (Vdd) and the negative multiple voltage circuit.

Description:
FIELD OF THE INVENTION 
   The present invention is related to a driver for amplifying an operating voltage, and more particularly to a driver for amplifying an operating voltage of a low driving voltage and driving the luminary. 
   BACKGROUND OF THE INVENTION 
   Some luminaries including a light emitting display (LED), a laser diode and a liquid crystal display (LCD) are applied widely due to the properties of long life, low driving voltage, high reaction speed and shockproof, thus the development of the photoelectric industry is expedited vigorously. 
   Recently, several circuit devices of low driving-voltage luminaries have been disclosed, but all of them usually includes more transistors or are composed of complex integrated circuit devices. The inventor of the present invention disclosed a circuit device of a low driving-voltage luminary in 2001 and 2002. Shown in FIG.  1 ( a ) and  1 ( b ), the circuit device is composed of two transistor Q and Q′, a resistor P, an inductor L and a capacitor and includes least elements without introducing any transformer. The circuit device of a low driving-voltage luminary drives the luminary via the lowest voltage about 1 V. However, some luminaries having protecting circuits are driven via an operating voltage about 4.5 V, so as to keep the electric device operating stably and protect luminaries. Therefore, the present invention is attempted to improve the prior art and provides a driver for amplifying an operating voltage of a low driving voltage, wherein the electric device can be operated stably and conform to being economic. Although the prior art discloses a driver for driving a low driving-voltage luminary, the driver of the prior art can&#39;t provide the luminary with a wide-ranged operating voltage or drive a luminary having a protecting circuit stably. 
   Hence, the present invention is attempted to improve the prior art and provides a driver for amplifying an operating voltage of a low driving voltage and driving the luminary. 
   SUMMARY OF THE INVENTION 
   It is one object of the present invention to provide a device for amplifying an operating voltage of a low driving voltage and driving the luminary. 
   According to the present invention, a driver for amplifying an operating voltage of a luminary includes a driving circuit providing a first signal, and a negative multiple voltage circuit electrically connected to the driving circuit and the luminary respectively for transforming the first signal into a second signal to be transmitted to the luminary, thereby the luminary being driven in response to the second signal. 
   Certainly, the first signal can be an alternating current signal. 
   Certainly, the second signal can be a direct current signal. 
   Certainly, the second signal can be a negative voltage. 
   Preferably, the second signal has an absolute voltage larger than that of the first signal. 
   Certainly, the operating voltage can be larger than 4.5 V. 
   Certainly, the luminary can be driven via a relatively low driving voltage. 
   Certainly, the relatively low driving voltage can be used less than 1.5 V. 
   Certainly, the driving circuit can be a step-up circuit via capacitor-inductor oscillating. 
   Certainly, the negative multiple voltage circuit further includes a first capacitor electrically connected to the driving circuit, a first diode having an anode electrically connected to the first capacitor and a cathode grounded, a second diode having an anode and a cathode electrically connected to the first capacitor and the anode of the first diode simultaneously, and a second capacitor having one terminal electrically connected to the anode of the second diode and the luminary simultaneously and another terminal grounded. 
   Preferably, the driver further includes a protecting circuit electrically connected between the anode of the second diode and the luminary. 
   According to the present invention, a driver for amplifying an operating voltage of a luminary and driving the luminary includes a driving circuit providing a first signal, and a rectifying circuit electrically connected to the driving circuit and the luminary respectively for transforming the first signal into a second signal to be transmitted to the luminary, thereby the luminary being driven in response to the second signal. 
   Certainly, the first signal can be an alternating current signal. 
   Certainly, the second signal can be a direct current signal. 
   Certainly, the second signal can be a negative voltage. 
   Preferably, the second signal has an absolute voltage larger than that of the first signal. 
   Certainly, the operating voltage can be larger than 4.5 V. 
   Certainly, the luminary can be driven via a relatively low driving voltage. 
   Certainly, the relatively low driving voltage can be used less than 1.5 V. 
   Certainly the driving circuit can be a step-up circuit via capacitor-inductor oscillating. 
   Preferably, the rectifying circuit further includes a diode having a cathode electrically connected to the driving circuit and an anode, and a capacitor having one terminal electrically connected to the anode of the diode and the luminary simultaneously and another terminal grounded. 
   Preferably, the driver further includes a protecting circuit electrically connected between the anode of the diode and the luminary. 
   According to the present invention, a driver for amplifying an operating voltage of a luminary and driving the luminary includes a driving circuit providing a first signal, and a step-up circuit electrically connected to the driving circuit and the luminary respectively for transforming the first signal into a second signal to be transmitted to the luminary, thereby the luminary being driven in response to the second signal. 
   Certainly, the first signal can be an alternating current signal. 
   Certainly, the second signal can be a direct current signal. 
   Certainly, the operating voltage can be larger than 4.5 V. 
   Certainly, the luminary can be driven via a relatively low driving voltage. 
   Certainly, the relatively low driving voltage can be used less than 1.5 V. 
   Certainly, the driving circuit can be a step-up circuit via capacitor-inductor oscillating. 
   Preferably, the step-up circuit further includes a first capacitor electrically connected to the driving circuit, a first diode having an anode electrically connected to the first capacitor and a cathode grounded, a second diode having an anode, and a cathode electrically connected to the first capacitor and the anode of the first diode simultaneously, and a second capacitor having one terminal electrically connected to the anode of the second diode and the luminary simultaneously and another terminal grounded. 
   Preferably, the driver further includes a protecting circuit electrically connected between the anode of the second diode and the luminary. 
   Certainly, the step-up circuit can be a negative multiple voltage circuit. 
   Preferably, the negative multiple voltage circuit further includes a first capacitor electrically connected to the driving circuit, a first diode having an anode electrically connected to the first capacitor and a cathode grounded, a second diode having an anode, and a cathode electrically connected to the first capacitor and the anode of the first diode simultaneously, and a second capacitor having one terminal electrically connected to the anode of the second diode and the luminary simultaneously and another terminal grounded. 
   Preferably, the driver further includes a protecting circuit electrically connected between the anode of the second diode and the luminary. 
   Certainly, the step-up circuit is a rectifying circuit 
   Preferably, the rectifying circuit further includes a diode having a cathode electrically connected to the driving circuit and an anode, a capacitor having one terminal electrically connected to the anode of the diode and the luminary simultaneously and another terminal grounded. 
   Preferably, the driver further includes a protecting circuit electrically connected between the anode of the diode and the luminary. 
   Now the foregoing and other features and advantages of the present invention will be more clearly understood through the following descriptions with reference to the drawings, wherein: 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIGS.  1 ( a )- 1 ( b ) illustrate a driver of the prior art for driving a low driving-voltage luminary; 
       FIG. 2  illustrates a functional diagram of the present invention; 
       FIG. 3  illustrates a first preferred embodiment of the driver for amplifying an operating voltage of a low driving voltage according to the present invention; 
       FIG. 4  illustrates a second preferred embodiment of the driver for amplifying an operating voltage of a low driving voltage according to the present invention; 
       FIG. 5  illustrates a third preferred embodiment of the driver for amplifying an operating voltage of a low driving voltage according to the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   Please referring to  FIG. 2 , it illustrates a functional diagram of the present invention. The driver for amplifying an operating voltage of a luminary  11  includes a driving circuit  12 , and a step-up circuit  13  electrically connected to the driving circuit  12  and the luminary  11 . Furthermore, the driver includes a protecting circuit  14  electrically connected between the step-up circuit  13  and the luminary  11 . Meanwhile, the driving circuit can be a step-up circuit via capacitor-inductor oscillating. The preferred embodiment of the present invention of the luminary  11  is composed of a laser diode and a photo diode. 
   Please referring to  FIG. 3 , it illustrates a first preferred embodiment of the driver for amplifying an operating voltage of a low driving voltage according to the present invention. In the preferred embodiment, the driving circuit is composed of a first transistor Q 1 -NPN and a second transistor Q 2 -PNP. Meanwhile, the collector of the second transistor Q 2 -PNP is electrically connected to the base of the first transistor Q 1 -NPN, the collector of the first transistor Q 1 -NPN is electrically connected to the base of the second transistor Q 2 -PNP via a first capacitor C 1 , a grounded resistor for biasing voltage is electrically connected the connecting point of the base of the second transistor Q 2 -PNP and the first capacitor C 1 , the emitter of the second transistor Q 2 -PNP is electrically connected to a source Vdd, and the emitter of the first transistor Q 1 -NPN is grounded. Furthermore, the driving circuit includes a first inductor L 1  having one terminal electrically connected to the source Vdd and another terminal electrically connected to the collector of the first transistor Q 1 -NPN. Meanwhile, the operating voltage of the first inductor L 1  can be relatively low due to an effect of the self-agitated oscillation. The connecting point A of the collector of the first transistor Q 1 -NPN and the first inductor L 1  has an amplified voltage and is electrically connected to a negative multiple voltage circuit. The negative multiple voltage circuit includes a second capacitor C 2  electrically connected to the driving circuit a first diode D 1  having an anode electrically connected to the second capacitor C 2  and a cathode grounded, a second diode D 2  having an anode and a cathode electrically connected to the second capacitor C 2  and the anode of the first diode D 1  simultaneously, and a third capacitor C 3  having one terminal electrically connected to the anode of the second diode D 2  and the luminary simultaneously and another terminal grounded. Meanwhile the negative multiple voltage circuit can transform and amplify an alternating current signal sent from the driving circuit into a direct current signal. Thus the connecting point M of the anode of the second diode D 2  and the third capacitor C 3  has a negative amplified voltage, wherein the absolute voltage of the connecting point M is larger than that of the connecting point A. 
   Finally, the negative amplified voltage can drive the luminary having a protecting circuit and electrically connected to the connecting point M. Meanwhile the protecting circuit includes a third transistor Q 3 -NPN and a fourth transistor Q 4 -NPN. The emitter of the third transistor Q 3 -NPN is electrically connected to the connecting point M of the anode of the second diode D 2  and the third capacitor C 3 , the collector of the third transistor Q 3 -NPN is electrically connected to the base of the fourth transistor Q 4 -NPN, the base of the third transistor Q 3 -NPN is electrically connected to a photo diode D 4  via a resistor R 3 , the emitter of the fourth transistor Q 4 -NPN is electrically connected with a resistor R 4  and the connecting point M, and the collector of the fourth transistor Q 4 -NPN is electrically connected to a laser diode D 3 . The operating principle of the protecting circuit is described as the following. 
   When the emitter of the third transistor Q 3 -NPN electrically connected to the connecting point M receives the negative amplified voltage, and then provide an outputting current to the base of the fourth transistor Q 4 -NPN, thereby the inputting current of the collector of the fourth transistor Q 4 -NPN increasing and the laser diode D 3  triggering the photo diode D 4  continuously. When the laser diode D 3  triggers the photo diode D 4  continuously, the monitoring current Im is increased simultaneously, so as to conduct the third transistor Q 3 -NPN. On the contrary, the outputting and the inputting current of the collector and the base of the fourth transistor Q 4 -NPN reduces respectively , thereby the laser diode D 3  reducing the triggering current of the photo diode D 4  and the laser light outputting stably. 
   Please referring to  FIG. 4 , it illustrates a second preferred embodiment of the driver for amplifying an operating voltage of a low driving voltage according to the present invention. Comparing  FIG. 4  with  FIG. 3 , the driver omits the second diode D 2  and the third capacitor C 3 . In the fact, the operating principle of the second embodiment according to  FIG. 4  is the same as that of  FIG. 3 , and the second embodiment also can achieve the effect as the first embodiment does. Accordingly, the driver of the present invention is variable. Even if any equivalent element is omitted or added, the effect of the driver according to the present invention can&#39;t be influenced and the present invention is patentable. 
   Please referring to  FIG. 5 , it illustrates a third preferred embodiment of the driver for amplifying an operating voltage of a low driving voltage according to the present invention. In the preferred embodiment, the driving circuit is composed of a fifth transistor Q 5 -NPN and a sixth transistor Q 6 -PNP. Meanwhile, the collector of the fifth transistor Q 5 -NPN is electrically connected to the base of the sixth transistor Q 6 -PNP, the base of the fifth transistor Q 5 -NPN is electrically connected to the collector of the sixth transistor Q 6 -PNP via a fourth capacitor C 4 , a fifth resistor R 5  is electrically connected the connecting point of the base of the fifth transistor Q 5 -NPN and the fourth capacitor C 4 , the emitter of the sixth transistor Q 6 -PNP is electrically connected to a source Vdd, and the emitter of the fifth transistor Q 5 -NPN is grounded. Furthermore, the driving circuit includes a second inductor L 2  having one terminal grounded and another terminal electrically connected to the collector of the sixth transistor Q 6 -PNP. Meanwhile, the operating voltage of the second inductor L 2  can be relatively low due to an effect of the self-agitated oscillation. The connecting point A′ of the collector of the sixth transistor Q 6 -PNP and the second inductor L 2  has an amplified voltage and is electrically connected to a rectifying circuit. The rectifying circuit includes a fifth diode D 5  and a fifth capacitor C 5 . The fifth diode has a cathode electrically connected to the connecting point A′ and an anode electrically connected to the fifth capacitor C 5 . The fifth capacitor C 5  has one terminal electrically connected to the anode of the fifth diode D 5  and the luminary simultaneously and another terminal grounded. Meanwhile the rectifying circuit can transform and amplify an alternating current signal sent from the driving circuit into a direct current signal. Thus the connecting point M′ of the anode of the fifth diode D 5  and the fifth capacitor C 5  has a negative amplified voltage. 
   Finally, the negative amplified voltage can drive the luminary having a protecting circuit and electrically connected to the connecting point M′. Meanwhile the protecting circuit includes a seventh transistor Q 7 -NPN and a eighth transistor Q 8 -NPN. The emitter of the seventh transistor Q 7 -NPN is electrically connected to the connecting point M′ of the anode of the fifth diode D 5  and the fifth capacitor C 5 , the collector of the seventh transistor Q 7 -NPN is electrically connected to the base of the eighth transistor Q 8 -NPN, the base of the seventh transistor Q 7 -NPN is electrically connected to a photo diode D 4 ′ via a resistor R 7 , the emitter of the eighth transistor Q 8 -NPN is electrically connected with a resistor R 8  and the connecting point M′, and the collector of the eighth transistor Q 8 -NPN is electrically connected to a laser diode D 3 ′. The operating principle of the protecting circuit is described as the following. 
   When the emitter of the seventh transistor Q 7 -NPN electrically connected to the connecting point M′ receives the negative amplified voltage, and then provide an inputting current to the base of the eighth transistor Q 8 -NPN, thereby the outputting current and the inputting current of the collector and the base of the eighth transistor Q 8 -NPN increasing respectively and the laser diode D 3 ′ triggering the photo diode D 4 ′ continuously. When the laser diode D 3 ′ triggers the photo diode D 4 ′ continuously, the monitoring current Im′ is increased simultaneously, so as to conduct the seventh transistor Q 7 -NPN. On the contrary, the outputting current of the collector of the eighth transistor Q 8 -NPN reduces, thereby the laser diode D 3 ′ reducing the triggering current of the photo diode D 4 ′ and the laser light outputting stably. 
   Accordingly, the present invention provides a step-up circuit electrically connected between a driving circuit and a protecting circuit, thereby the operating voltage being amplified for triggering the luminary continuously, so as to output a light stably. 
   Although the present invention has been described and illustrated in detail, it is to be clearly understood that the same is by the way of illustration and example only and is not to be taken by way of limitation, the spirit and scope of the present invention being limited only by the terms of the appended claims.