TWI715350B - Driving device - Google Patents

Abstract

A driving device for driving a lighting-emitting element includes a bridge rectifier, a first transformer, a second transformer, a power switch element, a controller, a comparison circuit, a resonant circuit, a first output stage circuit, and a second output stage circuit. The first transformer generates a first induction voltage according to a first input voltage and a second input voltage. The first transformer is coupled through the power switch element and the second transformer to a ground voltage. The first output stage circuit generates a first output voltage according to the first induction voltage. The resonant circuit generates a resonant voltage. The phase difference between the resonant voltage and the first output voltage is substantially equal to 180 degrees. The second output stage circuit sums the first output voltage and the resonant voltage, so as to output a second output voltage to the light-emitting element.

Description

Drive device

The present invention relates to a driving device, and more particularly to a driving device that can drive a light-emitting element.

In the lighting application of light-emitting elements, the most common problem is flicker, which means that the brightness of light will periodically change over time. Generally speaking, when the switching frequency of light is below 60Hz, the human eye can easily perceive the flicker of the light source, and when the switching frequency of light is above 60Hz, although the human eye cannot easily detect it, it still easily causes eye fatigue And discomfort. In view of this, it is necessary to propose a new solution to overcome the shortcomings faced by the prior art.

In a preferred embodiment, the present invention provides a driving device for driving a light-emitting element, and includes: a bridge rectifier that generates a rectified potential according to a first input potential and a second input potential; and a first transformer , Including a first main coil and a first auxiliary coil, wherein the first main coil is used to receive the rectified potential, and the first auxiliary coil is used to generate a first induced potential; a second transformer, including A second main coil and a second auxiliary coil, wherein the first and second auxiliary coils are used to generate a second induced potential; a power switch, wherein the first main coil is passed through the power switch and the second Two main coils are coupled to a ground potential, and the power switch performs switching operations based on a clock potential; a controller generates the clock potential; and a first output stage circuit generates based on the first induced potential A first output potential; a resonance circuit; a comparison circuit, which compares the first output potential and the second induced potential with a reference potential, and controls the resonance circuit to generate a resonance potential, wherein the resonance potential and The phase difference between the first output potential is approximately equal to 180 degrees; and a second output stage circuit that sums the first output potential and the resonance potential to generate a second output potential, wherein the light-emitting element is based on the The second output potential selectively generates a light.

In order to make the purpose, features and advantages of the present invention more comprehensible, specific embodiments of the present invention are listed below, with the accompanying drawings, and detailed descriptions are as follows.

Certain words are used in the specification and the scope of the patent application to refer to specific elements. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and the scope of patent application do not use differences in names as a way to distinguish elements, but use differences in functions of elements as a criterion. The terms "including" and "including" mentioned in the entire specification and the scope of the patent application are open-ended terms, so they should be interpreted as "including but not limited to". The term "approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and achieve the basic technical effect. In addition, the term "coupling" includes any direct and indirect electrical connection means in this specification. Therefore, if it is described that a first device is coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connecting means. Two devices.

FIG. 1 is a schematic diagram of a driving device 100 according to an embodiment of the invention. The driving device 100 is used to drive a light-emitting element 190. For example, the driving device 100 can be applied to a desktop computer, a notebook computer, or an integrated computer. As shown in Figure 1, the driving device 100 includes: a bridge rectifier 110, a first transformer 120, a power switch 130, a controller 135, a second transformer 140, a first output stage circuit 150, and a comparator Circuit 160, a resonance circuit 170, and a second output stage circuit 180. It should be noted that although not shown in Figure 1, the driving device 100 may further include other components, such as a voltage regulator or (and) a negative feedback circuit.

The bridge rectifier 110 generates a rectified potential VR according to a first input potential VIN1 and a second input potential VIN2. Both the first input potential VIN1 and the second input potential VIN2 can come from an external power source, and an AC voltage having any frequency and any amplitude can be formed between the first input potential VIN1 and the second input potential VIN2. For example, the frequency of the AC voltage can be about 50Hz or 60Hz, and the root mean square value of the AC voltage can be about 110V or 220V, but it is not limited to this. The first transformer 120 includes a first main winding 121 and a first secondary winding 122. The first primary winding 121 can be located on one side of the first transformer 120, and the first secondary winding 122 can be located opposite to the first transformer 120. The other side. The first main coil 121 is used to receive the rectified potential VR, and in response to the first main coil 121, the first auxiliary coil 122 can be used to generate a first induced potential VS1. The second transformer 140 includes a second main coil 141 and a second secondary coil 142. The second primary coil 141 can be located on one side of the second transformer 140, and the second secondary coil 142 can be located opposite to the second transformer 140. The other side. The first main coil 121 is coupled to a ground potential VSS (for example: 0V) via the power switch 130 and the second main coil 141. The power switch 130 performs switching operations according to a clock potential VA, which can alternately On or off. In response to the second main coil 141, the second auxiliary coil 142 can be used to generate a second induced potential VS2. The controller 135 may be a control integrated circuit, where the controller 135 is used to generate the clock potential VA. The clock potential VA can be maintained at a fixed potential when the driving device 100 is initialized, and a periodic clock waveform can be provided after the driving device 100 enters the normal use stage. The first output stage circuit 150 generates a first output potential VOUT1 according to the first induced potential VS1. The comparison circuit 160 can compare the first output potential VOUT1 (or another potential similar to the first output potential VOUT1) and the second induced potential VS2 with a reference potential VREF, and control the resonance circuit 170 to generate a resonance potential VP , Wherein the phase difference between the resonance potential VP and the first output potential VOUT1 may be approximately equal to 180 degrees. The second output stage circuit 180 can sum the first output potential VOUT1 and the resonance potential VP to generate a second output potential VOUT2. The light emitting element 190 selectively generates a light according to the second output potential VOUT2. For example, if the second output potential VOUT2 is at a high logic level, the light emitting element 190 will generate light, and if the second output potential VOUT2 is at a low logic level, the light emitting element 190 will not generate any light. According to actual measurement results, this circuit design method can reduce the non-ideal stroboscopic phenomenon, so the use of the light-emitting element 190 of the driving device 100 will not easily cause eye fatigue of the user.

The following embodiments will introduce the detailed structure and operation of the driving device 100. It must be understood that these drawings and descriptions are only examples and are not used to limit the scope of the present invention.

FIG. 2 is a schematic diagram showing the driving device 200 according to an embodiment of the invention. In the embodiment in Figure 2, the driving device 200 has a first input node NIN1, a second input node NIN2, and an output node NOUT, and includes a bridge rectifier 210, a first transformer 220, and a power switch 230, a controller 235, a second transformer 240, a first output stage circuit 250, a comparison circuit 260, a resonance circuit 270, and a second output stage circuit 280. The first input node NIN1 and the second input node NIN2 of the driving device 200 can receive a first input potential VIN1 and a second input potential VIN2 respectively from an external power source, and the output node NOUT of the driving device 200 can be used to output a second The potential VOUT2 is output to a light-emitting element 290.

The bridge rectifier 210 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The anode of the first diode D1 is coupled to the first input node NIN1, and the cathode of the first diode D1 is coupled to a first node N1 to output a rectified potential VR. The anode of the second diode D2 is coupled to a ground potential VSS, and the cathode of the second diode D2 is coupled to the first input node NIN1. The anode of the third diode D3 is coupled to the second input node NIN2, and the cathode of the third diode D3 is coupled to the first node N1. The anode of the fourth diode D4 is coupled to the ground potential VSS, and the cathode of the fourth diode D4 is coupled to the second input node NIN2.

The first transformer 220 includes a first main coil 221 and a first secondary coil 222. The first primary coil 221 can be located on one side of the first transformer 220, and the first secondary coil 222 can be located opposite to the first transformer 220. The other side. The first end of the first main coil 221 is coupled to the first node N1 to receive the rectified potential VR, and the second end of the first main coil 221 is coupled to a second node N2. The first end of the first auxiliary coil 222 is coupled to a common node NC, and the second end of the first auxiliary coil 222 is coupled to a third node N3 to output a first induced potential VS1. In some embodiments, the common node NC may provide another ground potential, which may be the same as or different from the aforementioned ground potential VSS.

The power switch 230 includes a first transistor M1. The first transistor M1 can be an N-type metal oxide half field effect transistor. The control terminal of the first transistor M1 is used to receive a clock potential VA, the first terminal of the first transistor M1 is coupled to a fourth node N4, and the second terminal of the first transistor M1 is coupled to the first Two nodes N2. The controller 235 is used to generate the clock potential VA. The clock potential VA can be maintained at a fixed potential (for example, the ground potential VSS) when the driving device 200 is initialized, and a periodic clock waveform can be provided after the driving device 200 enters the normal use phase.

The second transformer 240 includes a second main coil 241, a second secondary coil 242, and a first resistor R1, wherein the second main coil 241 and the first resistor R1 can be located on the same side of the second transformer 240. The second auxiliary winding 242 can be located on the opposite side of the second transformer 240. The first end of the first resistor R1 is coupled to the fourth node N4, and the second end of the first resistor R1 is coupled to the ground potential VSS. The first end of the second main coil 241 is coupled to the fourth node N4, and the second end of the second main coil 241 is coupled to the ground potential VSS. The first end of the second auxiliary coil 242 is coupled to a fifth node N5 to output a second induced potential VS2, and the second end of the second auxiliary coil 242 is coupled to the common node NC.

The first output stage circuit 250 includes a fifth diode D5, a second resistor R2, and a first capacitor C1. The anode of the fifth diode D5 is coupled to the third node N3 to receive the first induced potential VS1, and the cathode of the fifth diode D5 is coupled to a sixth node N6. The first end of the second resistor R2 is coupled to the sixth node N6, and the second end of the second resistor R2 is coupled to a seventh node N7 to output a first output potential VOUT1. The first terminal of the first capacitor C1 is coupled to the seventh node N7, and the second terminal of the first capacitor C1 is coupled to the common node NC. In some embodiments, the resistance value of the second resistor R2 is approximately equal to the resistance value of the first resistor R1, and the two resistance values are relatively small, so that the potential V6 at the sixth node N6 will be close to or It is approximately equal to the first output potential VOUT1 at the seventh node N7.

The comparison circuit 260 includes a potential generator 261, a first comparator 262, and a second comparator 263. For example, the potential generator 261 can be a fixed battery, a voltage source controlled by voltage, or a voltage source controlled by current. The potential generator 261 is used to generate a reference potential VREF, which can be roughly proportional to the resistance of the second resistor R2. The positive input terminal of the first comparator 262 is used to receive the reference potential VREF, the negative input terminal of the first comparator 262 is coupled to the sixth node N6 to receive the potential V6, and the output terminal of the first comparator 262 is coupled Connect to an eighth node N8. If the reference potential VREF is higher than or equal to the potential V6 of the sixth node N6, the first comparator 262 will raise the potential V8 of the eighth node N8 to a high logic level; otherwise, the output terminal of the first comparator 262 will Presents a high impedance state. The positive input terminal of the second comparator 263 is coupled to the fifth node N5 to receive the second induced potential VS2, the negative input terminal of the second comparator 263 is used to receive the reference potential VREF, and the output of the second comparator 263 The terminal system is coupled to the eighth node N8. If the second sensing potential VS2 is higher than or equal to the reference potential VREF, the second comparator 263 will pull the potential V8 of the eighth node N8 to a high logic level; otherwise, the output terminal of the second comparator 263 will be high Impedance state. In some embodiments, the way of setting the reference potential VREF can be as described in the following equation (1):

……………….(1) 其中「VREF」代表參考電位VREF之電位位準，「R2」代表第二電阻器R2之電阻值，「I2MAX」代表通過第五二極體D5之電流I2之最大電流值，「R1」代表第一電阻器R1之電阻值，而「I1MAX」代表通過第一電晶體M1之電流I1之最大電流值。

………………. (1) Where "VREF" represents the potential level of the reference potential VREF, "R2" represents the resistance value of the second resistor R2, and "I2MAX" represents the current I2 passing through the fifth diode D5 "R1" represents the resistance value of the first resistor R1, and "I1MAX" represents the maximum current value of the current I1 passing through the first transistor M1.

According to equation (1), the reference potential VREF can be approximately equal to half of the product of the maximum current value of the fifth diode D5 and the resistance value of the second resistor R2. Because the maximum current value of the fifth diode D5 is also approximately equal to the maximum current value of the first transistor M1, the reference potential VREF can also be approximately equal to the maximum current value of the first transistor M1 and the resistance value of the first resistor R1 Half of the product of the two.

The resonant circuit 270 includes an inductor L1, a second transistor M2, a third resistor R3, and a second capacitor C2. The first end of the inductor L1 is coupled to a ninth node N9 to output a resonance potential VP, and the second end of the inductor L1 is coupled to a tenth node N10. The second transistor M2 can be an N-type MOSFET. The control terminal of the second transistor M2 is coupled to the eighth node N8 to receive the potential V8, the first terminal of the second transistor M2 is coupled to an eleventh node N11, and the second terminal of the second transistor M2 The terminal system is coupled to the tenth node N10. The first end of the third resistor R3 is coupled to the eleventh node N11, and the second end of the third resistor R3 is coupled to the common node NC. The first end of the second capacitor C2 is coupled to the ninth node N9, and the second end of the second capacitor C2 is coupled to the common node NC. The second transistor M2 is enabled or disabled by the first comparator 262 and the second comparator 263. FIG. 3 is an equivalent circuit diagram of the driving device 200 when the second transistor M2 is enabled according to an embodiment of the present invention (that is, the potential V8 of the eighth node N8 is at a high logic level). According to the actual measurement result, this design method helps the resonance circuit 270 to generate an appropriate resonance potential VP to compensate for the non-ideal characteristics of the first output potential VOUT1. For example, the resonance potential VP and the first output potential VOUT1 can be sine waves with the same waveform, and the phase difference between the resonance potential VP and the first output potential VOUT1 can be 180 degrees or -180 degrees, but it is not limited to this.

)並驅動發光元件290。 The second output stage circuit 280 includes a sixth diode D6 and a fourth resistor R4. The anode of the sixth diode D6 is coupled to the seventh node N7 to receive the first output potential VOUT1, and the cathode of the sixth diode D6 is coupled to the ninth node N9. The sixth diode D6 can be used to prevent the resonant potential VP from flowing back to the first output stage circuit 250. The first end of the fourth resistor R4 is coupled to the ninth node N9 to receive the resonance potential VP, and the second end of the fourth resistor R4 is coupled to the output node NOUT. Roughly speaking, the second output stage circuit 280 can add the first output potential VOUT1 and the resonance potential VP to generate the second output potential VOUT2 at the output node NOUT (that is,

) And drive the light emitting element 290.

The light emitting element 290 may include one or a plurality of light emitting diodes connected in series between the output node NOUT and the common node NC. The total number of light-emitting diodes is not particularly limited in the present invention. In other embodiments, the aforementioned light-emitting diodes can also be changed to sub-millimeter light-emitting diodes (Mini LED), micro-light-emitting diodes (Micro LED), or organic light-emitting diodes (Organic LED, OLED) , But not limited to this. For example, if the second output potential VOUT2 is at a high logic level, the light emitting element 290 will generate a light, and if the second output potential VOUT2 is at a low logic level, the light emitting element 290 will not generate any light.

FIG. 4 shows a signal waveform diagram of the driving device 200 according to an embodiment of the present invention, in which the horizontal axis represents time, and the vertical axis represents current value or potential level. In response to the high logic interval and the low logic interval of the clock potential VA, either the first transistor M1 or the fifth diode D5 is enabled either. According to the measurement results in Figure 4, when the current I1 through the first transistor M1 is greater than half of its maximum current value I1MAX, the second induced potential VS2 will be higher than the reference potential VREF, and the second comparator 263 will cause The second transistor M2 of the resonant circuit 270. Furthermore, when the current I2 passing through the fifth diode D5 is less than half of its maximum current value I2MAX, the potential V6 (or the first output potential VOUT1) of the sixth node N6 will be lower than the reference potential VREF, and the first The comparator 262 will enable the second transistor M2 of the resonance circuit 270. In addition, the second transistor M2 of the resonant circuit 270 is disabled. Under this design, the resonant circuit 270 can generate a resonant potential VP that is approximately the same as the waveform of the first output potential VOUT1, but the phase difference between the two is approximately equal to 180 degrees. Since the second output potential VOUT2 can be regarded as the sum of the first output potential VOUT1 and the resonance potential VP, the second output potential VOUT2 will be almost equal to the DC potential, which can completely eliminate the stroboscopic problem of the light emitting element 290.

In some embodiments, the component parameters of the driving device 200 may be as described below. The resistance value of the first resistor R1 may be between 0.99Ω and 1.01Ω, preferably 1Ω. The resistance value of the second resistor R2 may be between 0.99Ω and 1.01Ω, preferably 1Ω. The resistance value of the third resistor R3 may be between 9.9Ω and 10.1Ω, preferably 10Ω. The resistance value of the fourth resistor R4 may be between 446.5Ω and 493.5Ω, preferably 470Ω. The capacitance value of the first capacitor C1 may be between 800 μF and 1200 μF, preferably 1000 μF. The capacitance value of the second capacitor C2 can be between 0.95 μF and 1.05 μF, preferably 1 μF. The inductance value of the inductor L1 can be between 1.67H and 1.85H, preferably 1.76H. The ratio of the number of turns of the first main coil 221 to the first auxiliary coil 222 may be between 1 and 40, preferably 20. The ratio of the number of turns of the second main coil 241 to the second auxiliary coil 242 may be between 0.1 and 10, and preferably may be 1. The frequencies of the first output potential VOUT1 and the resonance potential VP may both be about 120 kHz. The frequency of the second output potential VOUT2 may be about 0 Hz. The above parameter ranges are obtained based on the results of many experiments, which help optimize the conversion efficiency of the driving device 200 and effectively suppress the stroboscopic phenomenon.

The present invention provides a novel driving device, which can suppress the non-ideal flicker of the corresponding light-emitting element, so as to reduce the user's eye fatigue and discomfort. Generally speaking, the driving device of the present invention is not susceptible to the negative effects of general low-frequency noise from the mains, so it is very suitable for use in various electronic devices.

It should be noted that the above-mentioned potential, current, resistance value, inductance value, capacitance value, and other component parameters are not the limiting conditions of the present invention. The designer can adjust these settings according to different needs. The driving device of the present invention is not limited to the state illustrated in Figs. 1-4. The present invention may only include any one or more of the features of any one or more of the embodiments in FIGS. 1-4. In other words, not all the features shown in the figures need to be implemented in the driving device of the present invention at the same time. Although the embodiment of the present invention uses metal oxide half field effect transistors as an example, the present invention is not limited to this. Those skilled in the art can use other types of transistors, such as junction field effect transistors or fins. Type field effect transistors, etc., without affecting the effect of the present invention.

The ordinal numbers in this specification and the scope of the patent application, such as "first", "second", "third", etc., do not have a sequential relationship between each other, and they are only used to distinguish two having the same Different components of the name.

Although the present invention is disclosed as above in a preferred embodiment, it is not intended to limit the scope of the present invention. Anyone who is familiar with the art can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to those defined by the attached patent scope.

100, 200: drive device; 110, 210: Bridge rectifier; 120, 220: the first transformer; 121, 221: the first main coil; 122, 222: the first secondary coil; 130, 230: power switch; 135, 235: Controller; 140, 240: the second transformer; 141, 241: the second main coil; 142, 242: the second secondary coil; 150, 250: the first output stage circuit; 160, 260: comparison circuit; 170, 270: resonance circuit; 180, 280: second output stage circuit; 190, 290: light-emitting element; 261: Potential generator; 262: the first comparator; 263: the second comparator; C1: the first capacitor; C2: the second capacitor; D1: The first diode; D2: The second diode; D3: The third diode; D4: The fourth diode; D5: The fifth diode; D6: The sixth diode; I1, I2: current; I1MAX, I2MAX: maximum current value; L1: inductor; M1: the first transistor; M2: the second transistor; N1: the first node; N2: the second node; N3: the third node; N4: the fourth node; N5: the fifth node; N6: The sixth node; N7: the seventh node; N8: the eighth node; N9: The ninth node; N10: the tenth node; N11: the eleventh node; NC: common node; NIN1: the first input node; NIN2: the second input node; NOUT1: the first output node; NOUT2: the second output node; R1: the first resistor; R2: the second resistor; R3: the third resistor; R4: the fourth resistor; V6, V8: Potential; VA: clock potential; VIN1: the first input potential; VIN2: the second input potential; VOUT1: the first output potential; VOUT2: second output potential; VR: rectification potential; VREF: reference potential; VS1: the first induced potential; VS2: second induction potential; VSS: ground potential; VP: resonance potential.

Figure 1 is a schematic diagram showing a driving device according to an embodiment of the present invention. Figure 2 is a schematic diagram showing the driving device according to an embodiment of the present invention. FIG. 3 shows an equivalent circuit diagram of the driving device according to an embodiment of the invention. Fig. 4 shows a signal waveform diagram of the driving device according to an embodiment of the invention.

100: Drive

110: Bridge rectifier

120: The first transformer

121: first main coil

122: first secondary coil

130: power switch

135: Controller

140: second transformer

141: second main coil

142: The second secondary coil

150: First output stage circuit

160: comparison circuit

170: Resonant circuit

180: second output stage circuit

190: Light-emitting element

VA: clock potential

VIN1: first input potential

VIN2: second input potential

VOUT1: first output potential

VOUT2: second output potential

VR: Rectified potential

VREF: Reference potential

VS1: First induction potential

VS2: second induction potential

VSS: Ground potential

VP: resonance potential

Claims (10)

A driving device is used to drive a light-emitting element, and includes: a bridge rectifier that generates a rectified potential according to a first input potential and a second input potential; a first transformer, including a first main coil and a second A secondary coil, wherein the first primary coil is used to receive the rectified potential, and the first secondary coil is used to generate a first induced potential; a second transformer includes a second primary coil and a second secondary Coils, wherein the first and second auxiliary coils are used to generate a second induced potential; a power switch, wherein the first main coil is coupled to a ground potential via the power switch and the second main coil, The power switch performs switching operations based on a clock potential; a controller that generates the clock potential; a first output stage circuit that generates a first output potential based on the first induced potential; a resonance circuit; A comparison circuit compares the first output potential and the second induced potential with a reference potential, and controls the resonance circuit to generate a resonance potential, wherein the phase difference between the resonance potential and the first output potential Approximately equal to 180 degrees; and a second output stage circuit that sums the first output potential and the resonance potential to generate a second output potential, wherein the light-emitting element selectively generates a second output potential according to the second output potential Light. According to the driving device described in claim 1, wherein the bridge rectifier includes: a first diode having an anode and a cathode, wherein the anode of the first diode is coupled to a first diode An input node to receive the first input potential, and the cathode of the first diode is coupled to a first node to output the rectified potential; a second diode has an anode and a cathode, wherein The anode of the second diode is coupled to the ground potential, and the cathode of the second diode is coupled to the first input node; a third diode has an anode and a cathode , Wherein the anode of the third diode is coupled to a second input node to receive the second input potential, and the cathode of the third diode is coupled to the first node; and a second The quadrupole has an anode and a cathode, wherein the anode of the fourth diode is coupled to the ground potential, and the cathode of the fourth diode is coupled to the second input node. According to the driving device described in claim 2, wherein the first main coil has a first end and a second end, and the first end of the first main coil is coupled to the first node to receive The rectified potential, the second end of the first main coil is coupled to a second node, the first auxiliary coil has a first end and a second end, and the first end of the first auxiliary coil is Is coupled to a common node, and the second end of the first secondary coil is coupled to a third node to output the first induced potential. The driving device described in item 3 of the scope of patent application, wherein the power switch includes: A first transistor has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the first transistor is used to receive the clock potential, and the first transistor of the first transistor The terminal is coupled to a fourth node, and the second terminal of the first transistor is coupled to the second node. According to the driving device described in claim 4, the second transformer further includes: a first resistor having a first end and a second end, wherein the first end of the first resistor is Is coupled to the fourth node, and the second end of the first resistor is coupled to the ground potential; wherein the second main coil has a first end and a second end, and the second main coil has a The first end is coupled to the fourth node, the second end of the second main coil is coupled to the ground potential, the second auxiliary coil has a first end and a second end, the second The first terminal of the secondary coil is coupled to a fifth node to output the second induced potential, and the second terminal of the second secondary coil is coupled to the common node. According to the driving device described in claim 5, wherein the first output stage circuit includes: a fifth diode having an anode and a cathode, wherein the anode of the fifth diode is coupled to The third node receives the first induced potential, and the cathode of the fifth diode is coupled to a sixth node; a second resistor has a first end and a second end, wherein the The first terminal of the second resistor is coupled to the sixth node, and the second terminal of the second resistor is coupled to a seventh node to output the first output potential; and A first capacitor has a first terminal and a second terminal, wherein the first terminal of the first capacitor is coupled to the seventh node, and the second terminal of the first capacitor is coupled to the Common node. According to the driving device described in item 6 of the scope of patent application, the comparison circuit includes: a potential generator for generating the reference potential; a first comparator having a positive input terminal, a negative input terminal, and a Output terminal, wherein the positive input terminal of the first comparator is used to receive the reference potential, the negative input terminal of the first comparator is coupled to the sixth node, and the output of the first comparator Terminal is coupled to an eighth node; and a second comparator having a positive input terminal, a negative input terminal, and an output terminal, wherein the positive input terminal of the second comparator is coupled to the first Five nodes are used to receive the second induced potential, the negative input terminal of the second comparator is used to receive the reference potential, and the output terminal of the second comparator is coupled to the eighth node. The driving device described in item 7 of the scope of patent application, wherein the resistance value of the second resistor is approximately equal to the resistance value of the first resistor, and the reference potential is approximately equal to the maximum current of the fifth diode And half of the product of the resistance value of the second resistor. According to the driving device described in claim 7, wherein the resonance circuit includes: an inductor having a first end and a second end, wherein the first end of the inductor is coupled to a ninth end Node to output the resonance potential, and the second end of the inductor Is coupled to a tenth node; a second transistor has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the second transistor is coupled to the eighth node, The first end of the second transistor is coupled to an eleventh node, and the second end of the second transistor is coupled to the tenth node; a third resistor has a first Terminal and a second terminal, wherein the first terminal of the third resistor is coupled to the eleventh node, and the second terminal of the third resistor is coupled to the common node; and a second The capacitor has a first terminal and a second terminal, wherein the first terminal of the second capacitor is coupled to the ninth node, and the second terminal of the second capacitor is coupled to the common node. According to the driving device described in claim 9, wherein the second output stage circuit includes: a sixth diode having an anode and a cathode, wherein the anode of the sixth diode is coupled to The seventh node receives the first output potential, and the cathode of the sixth diode is coupled to the ninth node; and a fourth resistor having a first end and a second end, wherein The first end of the fourth resistor is coupled to the ninth node to receive the resonance potential, and the second end of the fourth resistor is coupled to an output node to output the second output potential; The light-emitting element includes one or more light-emitting diodes connected in series between the output node and the common node.

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