CN210112322U - Power-adjustable LED driving power supply - Google Patents
Power-adjustable LED driving power supply Download PDFInfo
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- CN210112322U CN210112322U CN201821648283.0U CN201821648283U CN210112322U CN 210112322 U CN210112322 U CN 210112322U CN 201821648283 U CN201821648283 U CN 201821648283U CN 210112322 U CN210112322 U CN 210112322U
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Abstract
The utility model relates to a power adjustable LED drive power supply. The LED driving power supply with adjustable power comprises a voltage detection circuit, a light emitting circuit and a light control circuit; the input end of the voltage detection circuit is respectively connected with a detection voltage input end VIN and a reference signal input end VER, and the voltage detection circuit is connected with the light-emitting circuit; one end of the light-emitting circuit is connected with a power supply VCC; the light control circuit performs light emission control according to the detection result of the voltage detection circuit; the light control circuit is coupled with the light emitting circuit, and the light emitting circuit adjusts the output power according to the light emitting of the light control circuit. The utility model discloses, go the control output through the opto-coupler after handling input voltage signal, change output terminal voltage or current benchmark for the automatic power reduction of power uses after input voltage reduces, realizes output power and adjusts.
Description
Technical Field
The utility model relates to a LED drive power supply field, more specifically say, relate to a power adjustable LED drive power supply.
Background
With the continuous development and popularization of LED lighting technology, various driving power supplies appear in the market, from a few watts to hundreds of watts, the product series is increasingly rich and diversified, the functions are also increasingly perfect, and powerful guarantee is provided for the rapid popularization and development of LED lighting. Provides a powerful contribution to the high-quality life of people. Currently, LED driving power is going to standardization and standardization, and designers will tend to control cost more after ensuring industry standards in design.
The prior LED driving power supply technology has the following disadvantages: the current specifications of the LED driving power supply on the market are not universal enough, mainly because the commercial power voltage standards of various countries are not unified, for example, the voltage of 110V is used in japan, the power supply designed according to the 110V input voltage cannot be used in the environment of 277V in the united states, and the power supply designed according to the 277V input voltage cannot be used in the country of the 110V input voltage environment. In order to solve the problem, many power supply enterprises make power supplies with wide input ranges of 90-305V, but the wider input range of the design has higher corresponding cost, which is a problem faced by all power supply enterprises, and the power supplies designed according to the input wide ranges generally have the condition of excessive high-voltage input design, so that the cost performance is not high.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a power adjustable LED drive power supply is provided.
The utility model provides a technical scheme that its technical problem adopted is: an LED driving power supply with adjustable power is constructed, and comprises a voltage detection circuit, a light emitting circuit and a light control circuit;
the input end of the voltage detection circuit is respectively connected with a detection voltage input end VIN and a reference signal input end VER, and the voltage detection circuit is connected with the light-emitting circuit; one end of the light-emitting circuit is connected with a power supply VCC; the light control circuit performs light emitting control according to the detection result of the voltage detection circuit;
the light control circuit is coupled with the light emitting circuit, and the light emitting circuit adjusts the output power according to the light emission of the light control circuit.
Furthermore, the power-adjustable LED driving power supply of the present invention, the light-emitting circuit includes a resistor R12, a capacitor C10, and a light-emitting element U1-a;
the power supply VCC is connected with one end of the capacitor C10 through the resistor R12, and the other end of the capacitor C10 is connected with the output end of the voltage detection circuit; the light emitting element U1-A is connected in parallel across the capacitor C10.
Furthermore, the power-adjustable LED driving power supply of the present invention, the light control circuit includes an adjustable resistor VR, a resistor R10, and a photo resistor U1-B;
one end of the photosensitive resistor U1-B is connected with an output power control terminal VERI through the adjustable resistor VR, and the other end of the photosensitive resistor U1-B is connected with the output power control terminal VERI through the resistor R10; the other end of the photoresistor U1-B is grounded.
Further, power adjustable LED drive power supply, voltage detection circuit includes: the detection circuit is connected between the detection voltage input end VIN and the ground in series and is used for detecting the input voltage to generate a detection voltage;
a processing circuit connected between the detection circuit and the light-emitting circuit, comparing and amplifying the detection voltage and a reference voltage, and outputting a control signal to the light-emitting circuit when the detection voltage is lower than the reference voltage so as to stop the light-emitting circuit;
the hysteresis circuit is connected between the detection circuit and the light-emitting circuit and used for reducing the detection voltage to enable the processing circuit to stably work after the processing circuit is started; and
and a current limiting resistor R8 connected between the processing circuit and the light emitting circuit for limiting the current of the control signal.
Further, power adjustable LED drive power supply, detection circuitry includes first resistance R1, second resistance R2, third resistance R3 and fourth resistance R4, first resistance R1, second resistance R2, third resistance R3 and fourth resistance R4 are established ties in proper order between power bus's input and the ground.
Further, power adjustable LED drive power supply, still include: a single-phase rectifier circuit connected in series between the third resistor R3 and the fourth resistor R4 for rectifying the bus voltage;
the single-phase rectification circuit comprises a first diode D1, wherein the anode of the first diode D1 is connected with the third resistor R3, the cathode of the first diode D1 is connected with the fourth resistor R4, and the node between the cathode of the first diode D1 and the fourth resistor R4 is also connected to the processing circuit;
the voltage of the node between the cathode of the first diode D1 and the fourth resistor R4 is the detection voltage.
Further, power adjustable LED drive power supply, still include: and the voltage stabilizing circuit is connected with the fourth resistor R4 in parallel, carries out filtering processing on the detection voltage, and clamps the detection voltage within a preset range when the bus voltage rises.
Further, power adjustable LED drive power supply, voltage stabilizing circuit includes filter capacitor C1 and zener diode ZD1, filter capacitor C1 with zener diode ZD1 all with fourth resistance R4 is parallelly connected, just zener diode ZD 1's positive pole ground connection.
Further, the power-adjustable LED driving power supply of the present invention, the processing circuit includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first triode Q1 and a second triode Q2, a first end of the fifth resistor R5 is connected between a cathode of the first diode D1 and the fourth resistor R4, and a second end of the fifth resistor R5 is connected to a base of the first triode Q1;
an emitter of the first transistor Q1 is connected to the reference signal input VER, a collector of the first transistor Q1 is connected to a base of the second transistor Q2 through the sixth resistor R6, a first end of the seventh resistor R7 is connected between the sixth resistor R6 and the base of the second transistor Q2, and a second end of the seventh resistor R7 is connected to ground;
the emitter of the second transistor Q2 is connected to ground, and the collector of the second transistor Q2 is connected to the light emitting circuit through the current limiting resistor R8.
Further, power adjustable LED drive power supply, the hysteresis circuit includes second diode D2 and hysteresis resistance R74, second diode D2 with the hysteresis resistance R74 after establishing ties with processing circuit connects in parallel, just second diode D2's positive pole with first diode D1's negative pole is connected.
Implement the utility model discloses a power adjustable LED drive power supply has following beneficial effect: the LED driving power supply with adjustable power comprises a voltage detection circuit, a light emitting circuit and a light control circuit; the input end of the voltage detection circuit is respectively connected with a detection voltage input end VIN and a reference signal input end VER, and the voltage detection circuit is connected with the light-emitting circuit; one end of the light-emitting circuit is connected with a power supply VCC; the light control circuit performs light emission control according to the detection result of the voltage detection circuit; the light control circuit is coupled with the light emitting circuit, and the light emitting circuit adjusts the output power according to the light emitting of the light control circuit. The utility model discloses, go the control output through the opto-coupler after handling input voltage signal, change output terminal voltage or current benchmark for the automatic power reduction of power uses after input voltage reduces, realizes output power and adjusts.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of a power-adjustable LED driving power supply of the present invention;
fig. 2 is a schematic structural diagram of the medium voltage detection circuit of the present invention;
fig. 3 is a circuit diagram of the medium voltage detection circuit of the present invention;
fig. 4 is a circuit diagram of the middle lighting circuit and the light control circuit of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the power-adjustable LED driving power supply of the present invention includes a voltage detection circuit 100, a light emitting circuit 200, and a light control circuit 300, wherein the input terminal of the voltage detection circuit 100 is respectively connected to a detection voltage input terminal VIN and a reference signal input terminal VER, and the voltage detection circuit 100 is connected to the light emitting circuit 200; one end of the light-emitting circuit 200 is connected to a power supply VCC; the light control circuit 300 performs light emission control based on the detection result of the voltage detection circuit 100; the light control circuit 300 is coupled to the light emitting circuit 200, and the light emitting circuit 200 adjusts the output power according to the light emission of the light control circuit 300.
Referring to fig. 2, the power-adjustable LED driving power supply of this embodiment is disposed between the detection voltage input terminal VIN and the light emitting circuit 200, and mainly includes: the detection circuit 10 is connected in series between the input end of the detection voltage input end VIN and the ground, and is used for detecting the bus voltage and generating a corresponding detection voltage. Preferably, in this embodiment, the detection circuit 10 may be composed of a series resistor, and the resistor is connected in series between the input end of the detection voltage input end VIN and the ground to implement series voltage division of the bus voltage by the series resistor, so that the generated detection voltage and the bus voltage are in a linear relationship, that is, when the bus voltage increases, the detection voltage also increases in proportion, and when the bus voltage decreases, the detection voltage also decreases in proportion. Therefore, the bus voltage can be synchronously monitored and controlled by monitoring and controlling the detection voltage.
And the processing circuit 20 is connected between the detection circuit 10 and the light-emitting circuit 200, and is configured to compare and amplify the detection voltage with the reference voltage, and output a control signal to the light-emitting circuit 200 when the detection voltage is lower than the reference voltage, so as to stop the operation of the light-emitting circuit 200.
It is understood that the reference voltage can be preset, and in order to make the detection voltage more stable and make the power device in the circuit to be in a safe working environment, the power-adjustable LED driving power supply of the present embodiment further provides a voltage stabilizing circuit 40, and the voltage stabilizing circuit 40 is connected in parallel with the detection circuit 10.
It can be understood that the voltage stabilizing circuit 40 of the present embodiment may be composed of a capacitor and a voltage regulator tube, wherein the capacitor is used for filtering the detected voltage to make the detected voltage more stable, and meanwhile, may also couple out possible error control caused by the interference signal generated in the circuit and the accidental transient change of the bus voltage. The voltage regulator tube is used for positioning the detection voltage clamp in a safe interval when the bus voltage is continuously increased. Preferably, the safety interval may be a regulated voltage of a regulator tube, which may be determined by the selected regulator tube.
Further, the power-adjustable LED driving power supply of the present embodiment further includes a hysteresis circuit 30, where the hysteresis circuit 30 is connected between the detection circuit 10 and the light emitting circuit 200, and is mainly used to pull down the detection voltage when the processing circuit 20 is turned on, so as to avoid the unstable output control signal phenomenon caused by the fluctuation of the bus voltage at the turn-on point.
It can be understood that the hysteresis circuit 30 may be formed by a resistor and a diode connected in series, the pull-down range of the detection voltage may be adjusted by the resistor, and the value of the pull-down range determines the size of the pull-down range, i.e. the width of the hysteresis range of the detection voltage. Wherein, can confirm according to the actual product design to the resistance of resistance, the utility model discloses do not do specifically and restrict.
In order to make the structure and principle of the power-adjustable LED driving power supply of the present invention clearer, a specific embodiment is now described.
Referring to fig. 3, in the power-adjustable LED driving power supply of this embodiment, the detection circuit 10 includes: the voltage detection circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, wherein the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are sequentially connected in series between an input end VIN of a detection voltage input end VIN and ground. Wherein the detection voltage is taken from the voltage across the fourth resistor R4.
As shown in fig. 3, a single-phase rectifier circuit is provided between the third resistor R3 and the fourth resistor R4. It can be understood that the single-phase rectification circuit is mainly used for rectifying the bus voltage, and can avoid the occurrence of the reverse flow phenomenon.
Preferably, the single-phase rectification circuit of the present embodiment may be composed of diodes, and as shown in fig. 3, the single-phase rectification circuit includes a first diode D1, wherein an anode of the first diode D1 is connected to the third resistor R3, and a cathode of the first diode D1 is connected to the fourth resistor R4, wherein a node between the cathode of the first diode D1 and the fourth resistor R4 is further connected to the processing circuit 20.
Further, the voltage at the node between the cathode of the first diode D1 and the fourth resistor R4 is the detection voltage.
The processing circuit 20 comprises a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first triode Q1 and a second triode Q2, wherein a first end of the fifth resistor R5 is connected between the cathode of the first diode D1 and the fourth resistor R4, and a second end of the fifth resistor R5 is connected with the base of the first triode Q1; an emitter of the first triode Q1 is connected with reference voltage, a collector of the first triode Q1 is connected with a base of the second triode Q2 through a sixth resistor R6, a first end of a seventh resistor R7 is connected between a sixth resistor R6 and a base of the second triode Q2, and a second end of the seventh resistor R7 is connected with ground; the emitter of the second transistor Q2 is connected to ground, and the collector of the second transistor Q2 is connected to the light emitting circuit 200 through a current limiting resistor R8.
Preferably, the first transistor Q1 is a PNP transistor, and the second transistor Q2 is an NPN transistor. Specifically, the fifth resistor R5 is mainly used for limiting the detection voltage, and the first triode Q1 is mainly used for comparing and amplifying the detection voltage with the reference voltage, and is turned on when the detection voltage is lower than the reference voltage; the sixth resistor R6 and the seventh resistor R7 are mainly used for stability adjustment of the amplified detection voltage; the second transistor Q2 is mainly used for amplifying the detection voltage, and is turned on when the first transistor Q1 is turned on.
It will be understood that the specific operation of the processing circuit 20 is: when the voltage across the fourth resistor R4 drops to the on-voltage point of the first transistor Q1, the first transistor Q1 is turned on, and the second transistor Q2 is also turned on at the same time, so that the control signal of the access light-emitting circuit 200 is pulled down, thereby stopping the light-emitting circuit 200, and further avoiding the occurrence of the under-voltage condition.
Preferably, a current limiting resistor R8 is further disposed between the light emitting circuit 200 and the processing circuit 20, and is mainly used for limiting a current of the control signal, and the control signal can be input to the light emitting circuit 200 through the current limiting resistor R8.
The hysteresis circuit 30 includes: a second diode D2 and a hysteretic resistor R74, the second diode D2 is connected in series with the hysteretic resistor R74 and then connected in parallel with the processing circuit 20, and the anode of the second diode D2 is connected with the cathode of the first diode D1.
The second diode D2 mainly utilizes its one-way conduction characteristic, so that the detection voltage is pulled low when the first triode Q1 is turned on, and the unstable output control signal caused by the fluctuation of the bus voltage at the conduction point can be avoided. The hysteresis resistor R74 is mainly used to adjust the hysteresis range of the detection voltage.
Further, the specific operation process of the hysteresis circuit 30 is as follows: when the first transistor Q1 and the second transistor Q2 are turned on, the fourth resistor R4 is connected in parallel with the series circuit formed by the second diode D2, the hysteretic resistor R74 and the second transistor Q2, and at this time, the detection voltage of the fourth resistor R4 is pulled low, thereby ensuring reliable conduction of the first transistor Q1. When the bus voltage VIN rises and the voltage of the circuit formed by the fourth resistor R4, the second diode D2, the hysteresis resistor R74 and the second triode Q2 connected in parallel exceeds the turn-off threshold voltage of the first triode Q1, the first triode Q1 is turned off, and the second triode Q2 also judges simultaneously, at this time, the hysteresis circuit 30 formed by the hysteresis resistor R74 and the second diode D2 is opened, and the detection voltage of the fourth resistor R4 rises to a higher point rapidly, so that the first triode Q1 is turned off reliably.
The voltage stabilizing circuit 40 comprises a filter capacitor C1 and a zener diode ZD1, wherein the filter capacitor C1 and the zener diode ZD1 are both connected in parallel with the fourth resistor R4, and the anode of the zener diode ZD1 is grounded.
It is understood that the filter capacitor C1 is mainly used to filter the detected voltage to make the detected voltage more stable and trend to the reference voltage, and the filter capacitor C1 can also couple out the interference signal generated in the circuit and the possible error control caused by the accidental transient change of the bus voltage.
The zener diode ZD1 is mainly used for clamp control of the detection voltage. It can be understood that, since the detection voltage and the bus voltage are in a linear relationship, when the bus voltage is increasing, the detection voltage is also increasing proportionally, and the breakdown voltages of the base and the emitter of the first transistor Q1 are limited, for example, the transistors packaged by the common SOT-23 are all around 6V, so that when VIN is in a high-voltage state, there is a risk of breakdown of the first transistor Q1, and therefore, the detection voltage can be well clamped in a safe interval through the zener diode ZD1, that is, the voltage stabilizing capability of the zener diode ZD 1.
Referring to fig. 4, the power-adjustable LED driving power supply of the present invention, the light emitting circuit 200 includes a resistor R12, a capacitor C10, and a light emitting element U1-a; the power supply VCC is connected with one end of a capacitor C10 through a resistor R12, and the other end of the capacitor C10 is connected with the output end of the voltage detection circuit 100; the light-emitting element U1-a is connected in parallel across the capacitor C10.
Referring to fig. 4, the power-adjustable LED driving power supply of the present invention, the light control circuit 300 includes an adjustable resistor VR, a resistor R10, and a photo resistor U1-B; one end of the photosensitive resistor U1-B is connected with an output power control end VERI through an adjustable resistor VR, and the other end of the photosensitive resistor U1-B is connected with the output power control end VERI through a resistor R10; the other end of the photo-resistor U1-B is connected to ground.
To sum up, the power-adjustable LED driving power supply is: the variable quantity of the input voltage of the power supply is detected by using a resistor R1, a resistor R2, a resistor R3 and a resistor R4 at the end of a detection voltage input end VIN through a resistor voltage division method, the detected voltage signal is filtered into a stable direct current signal by using the resistor R4 and a capacitor C1, and a voltage stabilizing diode ZD1 is used for protecting a first triode Q1 from being damaged under the condition of overhigh voltage. Comparing a reference signal of a reference signal input end VER with a detected input signal and judging the state of the second triode Q2; the resistor R74 and the second diode D2 are used for adjusting the range of return difference between the detection signal and the output signal, and the stability of the circuit is ensured; the resistor R12, the light-emitting element U1-A and the resistor R8 generate an optical signal to control the on and off of the photosensitive resistor U1-B; VERI is a reference voltage reference point of the secondary that controls the output voltage or current.
The circuit operation process is that when the input voltage is lower than the set voltage value, the second triode Q2 is conducted, and the resistor R74 and the second diode D2 can reliably ensure the conducting state of the second triode Q2. When the second triode Q2 is switched on, the light-emitting element U1-A works to generate and output an optical signal, the photoresistor U1-B changes from high impedance to low impedance after receiving the optical signal, so that the adjustable resistor VR is connected with the set resistor R10 in parallel, the resistance voltage division reference VERI is reduced, the reference is reduced, the output power of the power supply is automatically reduced when the input voltage of the power supply is reduced, and the service life of the power supply is ensured.
The utility model discloses go control output through the opto-coupler after handling input voltage signal, change output terminal voltage or current benchmark for the automatic power reduction of power uses after input voltage reduces, realizes output power and adjusts.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.
Claims (10)
1. The power-adjustable LED driving power supply is characterized by comprising a voltage detection circuit (100), a light emitting circuit (200) and a light control circuit (300);
the input end of the voltage detection circuit (100) is respectively connected with a detection voltage input end VIN and a reference signal input end VER, and the voltage detection circuit (100) is connected with the light-emitting circuit (200); one end of the light-emitting circuit (200) is connected with a power supply VCC; the light control circuit (300) performs light emission control according to the detection result of the voltage detection circuit (100);
the light control circuit (300) is coupled with the light emitting circuit (200), and the light emitting circuit (200) adjusts the output power according to the light emission of the light control circuit (300).
2. The power-adjustable LED driving power supply according to claim 1, wherein the lighting circuit (200) comprises a resistor R12, a capacitor C10, a lighting element U1-A;
the power supply VCC is connected with one end of the capacitor C10 through the resistor R12, and the other end of the capacitor C10 is connected with the output end of the voltage detection circuit (100); the light emitting element U1-A is connected in parallel across the capacitor C10.
3. The power tunable LED driving power supply according to claim 2, wherein the light control circuit (300) comprises an adjustable resistor VR, a resistor R10, a photo resistor U1-B;
one end of the photosensitive resistor U1-B is connected with an output power control terminal VERI through the adjustable resistor VR, and the other end of the photosensitive resistor U1-B is connected with the output power control terminal VERI through the resistor R10; the other end of the photoresistor U1-B is grounded.
4. The power tunable LED driving power supply according to claim 2 or 3, wherein the voltage detection circuit (100) comprises: the detection circuit is connected between the detection voltage input end VIN and the ground in series and is used for detecting the input voltage to generate a detection voltage;
the processing circuit is connected between the detection circuit and the light-emitting circuit (200), compares and amplifies the detection voltage with a reference voltage, and outputs a control signal to the light-emitting circuit (200) when the detection voltage is lower than the reference voltage so as to stop the light-emitting circuit (200);
the hysteresis circuit is connected between the detection circuit and the light-emitting circuit (200) and used for reducing the detection voltage after the processing circuit is started so as to enable the processing circuit to stably work; and
and a current limiting resistor R8 connected between the processing circuit and the light emitting circuit (200) for limiting the current of the control signal.
5. The power-adjustable LED driving power supply according to claim 4, wherein the detection circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, and the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are sequentially connected in series between the input end of the power bus and the ground.
6. The power tunable LED driving power supply according to claim 5, further comprising: a single-phase rectifier circuit connected in series between the third resistor R3 and the fourth resistor R4 for rectifying the bus voltage of the power bus;
the single-phase rectification circuit comprises a first diode D1, wherein the anode of the first diode D1 is connected with the third resistor R3, the cathode of the first diode D1 is connected with the fourth resistor R4, and the node between the cathode of the first diode D1 and the fourth resistor R4 is also connected to the processing circuit;
the voltage of the node between the cathode of the first diode D1 and the fourth resistor R4 is the detection voltage.
7. The power tunable LED driving power supply according to claim 5, further comprising: and the voltage stabilizing circuit is connected with the fourth resistor R4 in parallel, carries out filtering processing on the detection voltage, and clamps the detection voltage within a preset range when the bus voltage of the power supply bus is increased.
8. The power-adjustable LED driving power supply according to claim 7, wherein the voltage stabilizing circuit comprises a filter capacitor C1 and a zener diode ZD1, the filter capacitor C1 and the zener diode ZD1 are both connected in parallel with the fourth resistor R4, and the anode of the zener diode ZD1 is grounded.
9. The power-adjustable LED driving power supply according to claim 6, wherein the processing circuit comprises a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first transistor Q1 and a second transistor Q2, a first end of the fifth resistor R5 is connected between a cathode of the first diode D1 and the fourth resistor R4, and a second end of the fifth resistor R5 is connected to a base of the first transistor Q1;
an emitter of the first transistor Q1 is connected to the reference signal input VER, a collector of the first transistor Q1 is connected to a base of the second transistor Q2 through the sixth resistor R6, a first end of the seventh resistor R7 is connected between the sixth resistor R6 and the base of the second transistor Q2, and a second end of the seventh resistor R7 is connected to ground;
the emitter of the second transistor Q2 is connected to ground, and the collector of the second transistor Q2 is connected to the light emitting circuit (200) through the current limiting resistor R8.
10. The power-adjustable LED driving power supply according to claim 6, wherein the hysteretic circuit comprises a second diode D2 and a hysteretic resistor R74, the second diode D2 is connected in series with the hysteretic resistor R74 and then connected in parallel with the processing circuit, and the anode of the second diode D2 is connected with the cathode of the first diode D1.
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| CN201821648283.0U CN210112322U (en) | 2018-10-11 | 2018-10-11 | Power-adjustable LED driving power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710887A (en) * | 2020-12-08 | 2021-04-27 | 深圳佑驾创新科技有限公司 | Voltage detection circuit, control device and control method for vehicle-mounted electronic equipment |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112710887A (en) * | 2020-12-08 | 2021-04-27 | 深圳佑驾创新科技有限公司 | Voltage detection circuit, control device and control method for vehicle-mounted electronic equipment |
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