A wide voltage output automatic identification lamp belt switch power supply circuit and method

Abstract

The present invention discloses a wide voltage output automatic identification light strip switch power supply circuit and method thereof, characterized in that: it comprises a variable power supply output circuit, a light strip voltage acquisition and voltage locking control circuit, the variable power supply output circuit is used to cyclically output the variable power supply from a low voltage value to a high voltage value in sequence, the light strip voltage acquisition and voltage locking control circuit is used to lock the output voltage of the variable power supply output circuit to power the light strip after the voltage of the light strip acquired matches a certain output voltage of the variable power supply output circuit. The present invention realizes intelligent adaptation when using different light strip voltages, and prevents the light strip from being burned out due to misoperation.

Description

Technical Field

[0001] The present invention relates to the technical field of switching power supplies, and in particular to a wide voltage output automatic identification lamp belt switching power supply circuit and a method thereof. Background Art

[0002] At present, ordinary LED switching power supplies do not have the function of intelligently identifying the voltage of the light strip, and consumers' misoperation during use may cause the light strip to burn out. Summary of the invention

[0003] The present invention provides a wide voltage output automatic identification lamp belt switch power supply circuit and method thereof, which realizes intelligent adaptation when using different lamp belt voltages and prevents the lamp belt from being burned out due to misoperation.

[0004] The technical solution of the present invention is:

[0005] A wide voltage output automatic identification light strip switch power supply circuit includes a variable power supply output circuit, a light strip voltage collection and voltage locking control circuit, wherein the variable power supply output circuit is used to cyclically output the variable power supply from a low voltage value to a high voltage value in sequence, and the light strip voltage collection and voltage locking control circuit is used to lock the output voltage of the variable power supply output circuit to power the light strip after the collected voltage of the light strip matches a certain output voltage of the variable power supply output circuit.

[0006] Furthermore, the variable power supply output circuit includes an MCU controller that can adjust and control the output voltage, and the lamp strip voltage collection and voltage locking control circuit includes a sensing resistor Rs, a first switch tube Q4, and a second switch tube Q5. The sensing resistor Rs is connected in series with the lamp strip, and the first end of the sensing resistor Rs is also connected to the input end of the MCU controller. The second end of the sensing resistor Rs is also connected to the second end of the first switch tube Q4 and the second end of the second switch tube Q5 respectively. The first end of the first switch tube Q4 is connected to the output end of the variable power supply output circuit, the control end of the first switch tube Q4 is connected to the driving end of the MCU controller, and the second end of the first switch tube Q4 is also connected to the control end of the second switch Q5.

[0007] Furthermore, the first switch tube Q4 is a triode, and the second switch Q5 is a MOS tube.

[0008] Furthermore, the variable power supply output circuit also includes a power supply, a voltage conversion circuit, a voltage output circuit and an output voltage adjustment circuit. The power supply circuit is used to provide the total power supply of the system. The voltage conversion circuit is used to convert the voltage of the power supply circuit into a voltage output in a certain range. The input end of the voltage output circuit is connected to the output end of the voltage conversion circuit, the output end of the voltage output circuit is grounded, the output end of the output voltage adjustment circuit is connected to the control end of the voltage output circuit, and the output voltage adjustment circuit changes the voltage of the voltage output circuit by adjusting and controlling the current of the voltage output circuit.

[0009] Furthermore, the voltage output circuit includes a third switch tube Q3, a first resistor R7 and a controllable Zener diode U2, the input end of the third switch tube Q3 is connected to the output end of the voltage conversion circuit, the output end of the first switch tube Q3 is connected to the first end of the first resistor R7, the control end of the third switch tube Q3 is connected to the input end of the third switch tube Q3 through the second resistor R8, the second end of the first resistor R7 is connected to the cathode of the controllable Zener diode U2, and the control end of the controllable Zener diode U2 is connected to the output end of the output voltage adjustment circuit.

[0010] Furthermore, the voltage output circuit also includes a photocoupler, wherein the anode of the light emitting diode PCA in the photocoupler is connected to the second end of the first resistor R7, and the cathode of the light emitting diode PCA in the photocoupler is connected to the cathode of the controllable voltage stabilizing diode U2.

[0011] Furthermore, the output voltage adjustment circuit includes several groups of down-bias resistors, a voltage selection key, a first voltage-dividing resistor R14 and a second voltage-dividing resistor R15, wherein the first end of each group of down-bias resistors is respectively connected to an IO port of the MCU controller, the second end of each group of down-bias resistors is respectively connected to the first end of the first voltage-dividing resistor R14, the second end of the first voltage-dividing resistor R14 is grounded, the first end of the second voltage-dividing resistor R15 is connected to the output end of the voltage conversion circuit, the second end of the second voltage-dividing resistor R15 is respectively connected to the second end of each group of down-bias resistors, the voltage selection key is connected to the MCU controller, and through the operation of the external key, the IO port connected to the down-bias resistor is pulled down to the ground in turn, and the resistors connected in series to the IO port are connected in parallel with the first voltage-dividing resistor R14 in turn.

[0012] Furthermore, the variable power supply output circuit also includes an MCU controller power supply circuit, which includes a depletion-type MOS tube and an LDO regulator. The drain of the depletion-type MOS tube is connected to the output end of the voltage conversion circuit, and the source is connected to the input end of the LDO regulator. The gate of the depletion-type MOS tube and the control end of the LDO regulator are grounded, and the output end of the LDO regulator supplies power to the MCU controller.

[0013] Further, the variable power supply output circuit also includes a switching power supply constant power control circuit, and the switching power supply constant power control circuit is used to perform constant power control on the electrical signal of the voltage at both ends of the wide voltage when the wide voltage is output; the switching power supply constant power control circuit includes a transformer auxiliary VCC winding, a PWM controller, a low voltage output constant power clamp circuit, a high voltage output constant power compensation circuit, a fourth switch tube Q2, a third resistor R1 and a fourth resistor R4, the transformer auxiliary VCC winding senses and samples the voltage of the voltage output circuit, the drain of the fourth switch tube Q2 is connected to the output end of the power supply, the gate of the fourth switch tube Q2 is connected to the driving output end of the PWM controller, the source of the fourth switch tube Q2 is connected to the first end of the third resistor R1 and the first end of the fourth resistor R4 respectively, the second end of the third resistor R1 is grounded, the second end of the fourth resistor R4 is connected to the CS end of the PWM controller, and the input end and the output end of the low voltage output constant power clamp circuit are connected in parallel to the photoelectric receiver CE in the photoelectric coupler. At two ends, the emitter of the photoelectric receiver E of the photoelectric coupler is grounded, and the collector of the photoelectric receiver C of the photoelectric coupler is connected to the FB port of the PWM controller. The low-voltage output constant power clamping circuit is used to clamp the voltage when the output voltage of the variable power supply output circuit is lower than the minimum voltage of the variable voltage so that the voltage tends to the minimum voltage; the first end of the high-voltage output constant power compensation circuit is connected to the voltage output end of the induction coil, and the second end of the high-voltage output constant power compensation circuit is connected to the CS pin of the PWM controller. The high-voltage output constant power compensation circuit is used to reversely compensate the voltage when the output voltage of the variable power supply output circuit is higher than the maximum value of the variable voltage so that the output voltage of the PWM tends to the maximum value of the variable voltage.

[0014] A method for automatically identifying a lamp belt voltage of a wide voltage output automatic identification lamp belt switch power supply circuit, the method comprising:

[0015] The variable power output circuit cyclically outputs the variable power in sequence from a low voltage output value point to a high voltage output value point;

[0016] The light strip voltage collection and voltage locking control circuit collects the induced voltage of the light strip. When the induction resistor in series with the light strip collects the induced voltage for the first time, the light strip voltage collection and voltage locking control circuit locks the output voltage of the variable power supply output circuit to power the light strip. Otherwise, the variable power supply output circuit will cycle the output voltage from the low voltage output value point to the high voltage output value point in sequence until the light strip voltage collection and voltage locking control circuit collects the induced voltage.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: realizing intelligent adaptation when using different light strip voltages, and preventing the light strip from being burned out due to misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 2 is a circuit diagram of an embodiment. DETAILED DESCRIPTION

[0019] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed by the present invention.

[0020] like Figure 1 As shown, a wide voltage output automatic identification light strip switch power supply circuit includes a variable power supply output circuit, a light strip voltage collection and voltage locking control circuit 4, wherein the variable power supply output circuit is used to output the variable power supply in a cycle from a low voltage value to a high voltage value in sequence, and the light strip voltage collection and voltage locking control circuit is used to lock the output voltage of the variable power supply output circuit to power the light strip after the collected voltage of the light strip matches a certain output voltage of the variable power supply output circuit.

[0021] In some embodiments, the variable power supply output circuit includes an MCU controller that can adjust and control the output voltage, and the lamp strip voltage collection and voltage locking control circuit 4 includes a sensing resistor Rs, a first switch tube Q4, and a second switch tube Q5. The sensing resistor Rs is connected in series with the lamp strip, and the first end of the sensing resistor Rs is also connected to the input end of the MCU controller. The second end of the sensing resistor Rs is also connected to the second end of the first switch tube Q4 and the second end of the second switch tube Q5 respectively. The first end of the first switch tube Q4 is connected to the output end of the variable power supply output circuit, the control end of the first switch tube Q4 is connected to the control end of the MCU controller, and the second end of the first switch tube Q4 is also connected to the control end of the second switch Q5.

[0022] In some embodiments, the first switch tube Q4 is a triode, and the second switch Q5 is a MOS tube.

[0023] In some embodiments, the control end of the first switch tube Q4 is further connected to the first end of the seventh resistor R17, and the second end of the seventh resistor R17 is connected to the driving end of the MCU controller. The seventh resistor R7 is used to limit the current of the first switch tube Q4.

[0024] The first end of the second switch tube Q5 is also connected to the first end of an eighth resistor R18 having a current limiting function, and the second end of the eighth resistor R18 is connected to the output end of the MCU controller.

[0025] When the circuit is in use, the variable power supply is outputted in a cycle from a low voltage output value point to a high voltage output value point through a variable power supply output circuit cycle;

[0026] The light strip voltage collection and voltage locking control circuit collects the induced voltage of the light strip. When the induction resistor in series with the light strip collects the induced voltage for the first time, the light strip voltage collection and voltage locking control circuit locks the output voltage of the variable power supply output circuit to power the light strip. Otherwise, the variable power supply output circuit will cycle the output voltage from the low voltage output value point to the high voltage output value point in sequence until the light strip voltage collection and voltage locking control circuit collects the induced voltage.

[0027] Specifically, (1) first set a power-on sequence for the MCU: 9V-12V-24V-36V-48V, with the default value being 9V;

[0028] (2) When the output terminal of the variable output power supply circuit is connected to a 12V light strip, after the MCU controller samples the signal of the sensing resistor RS, the MCU controller will automatically perform a cycle according to its power-on timing. Only when the output voltage of the variable output power supply circuit appears 12V for the first time can the lighting requirement of the light strip be met. Then, the voltage output by the variable output power supply matches the voltage of the light strip. The MCU controller will automatically switch the output voltage to the matching load voltage and save the setting, and keep the current state setting at the next power-on. At the same time, the output terminal DRIVE pin of the MCU controller automatically changes from a high level to a low level, the second switch tube Q5 is turned on, and there is no sampling signal of the sensing resistor RS.

[0029] (3) When the output terminal of the variable output power supply circuit is connected to a 24V light strip, the MCU controller starts to cycle from the 9V default state until the first sampling signal appears at the RS pin of the sensing resistor. Based on the first signal, the MCU will automatically switch the output voltage to the matching load voltage and save the setting, and keep the current setting at the next startup. At the same time, the DRIVE pin of the MCU controller automatically changes from a high level to a low level, Q5 is turned on, and there is no sampling signal at the sensing resistor RS.

[0030] (4) When the variable output power supply circuit output is connected to a 36V or 48V light strip, the automatic identification logic refers to the above steps;

[0031] (5) When the variable output power supply circuit is 48V output and connected to a 12V light strip, the MCU controller automatically starts the above-mentioned power-on voltage output timing after sampling the signal from the induction RS. When the sampled RS signal becomes weak, the program runs a gear corresponding to the output voltage. After that, the MCU will automatically switch the output voltage to the matching load voltage and save the setting, and keep the current state setting at the next startup. At the same time, the DRIVE pin automatically changes from a high level to a low level, Q5 is turned on, and there is no RS sampling signal;

[0032] (6) When the 36V output is connected to a 12V light strip or other voltage ranges, the automatic identification logic refers to step (5);

[0033] (7) When the MCU controller fails to sample a signal at the sensing resistor RS end within 3S, it is considered no-load and the program will not make any identification judgment.

[0034] In some embodiments, the variable power supply output circuit also includes a power supply, a voltage conversion circuit, a voltage output circuit and an output voltage adjustment circuit. The power supply circuit is used to provide a total power supply for the system. The voltage conversion circuit is used to convert the voltage of the power supply circuit into a voltage output in a certain range. The input end of the voltage output circuit is connected to the output end of the voltage conversion circuit, the output end of the voltage output circuit is grounded, the output end of the output voltage adjustment circuit is connected to the control end of the voltage output circuit, and the output voltage adjustment circuit changes the voltage of the voltage output circuit by regulating and controlling the current of the voltage output circuit.

[0035] In some embodiments, the voltage output circuit includes a third switch tube Q3, a first resistor R7 and a reference source chip U2, the input end of the third switch tube Q3 is connected to the output end of the voltage conversion circuit, the output end of the third switch tube Q3 is connected to the first end of the first resistor R7, the control end of the third switch tube Q3 is connected to the input end of the third switch tube Q3 through the second resistor R8, the second end of the first resistor R7 is connected to the negative electrode of the reference source chip U2, and the control end of the controllable voltage regulator diode is connected to the output end of the output voltage adjustment circuit.

[0036] In some embodiments, the voltage output circuit further includes a photocoupler, wherein the anode of the light emitting diode PCA in the photocoupler is connected to the second end of the first resistor R7, and the cathode of the light emitting diode PCA in the photocoupler is connected to the cathode of the controllable voltage regulator diode U2.

[0037] In some embodiments, the output voltage adjustment circuit includes several groups of down-bias resistors, a voltage selection key, a first voltage-dividing resistor R14 and a second voltage-dividing resistor R15, wherein the first end of each group of down-bias resistors is respectively connected to an IO port of the MCU controller, the second end of each group of down-bias resistors is respectively connected to the first end of the first voltage-dividing resistor R14, the second end of the first voltage-dividing resistor R14 is grounded, the first end of the second voltage-dividing resistor R15 is connected to the output end of the voltage conversion circuit, the second end of the second voltage-dividing resistor R15 is respectively connected to the second end of each group of down-bias resistors, the voltage selection key is connected to the MCU controller, and through the operation of the external key, the IO port connected to the down-bias resistor is pulled down to the ground in turn, and the resistors connected in series to the IO port are connected in parallel with the first voltage-dividing resistor R14 in turn.

[0038] In some embodiments, by setting six groups of downward bias resistors R14, R13, R12, R11, R10, and R9, the output voltage range can be 12V; 18V; 24V; 27V; 36V; and 48V.

[0039] In some other embodiments, by setting 9 groups of bias resistors, the output voltage range can be made into nine categories: 5V; 6V; 9; 12V; 18V; 24V; 27V; 36V; 48V, thus achieving the output of 9 voltages.

[0040] The specific output voltage value can be matched by adjusting the resistance value of the bias resistor.

[0041] In some embodiments, the voltage selection key SW1 adopts single-key control, and the touch key is connected to the I / O of the MCU controller. When the key is pressed, the I / O is set to a low level. When the key is pressed twice, the two adjacent I / Os are at a low level, and so on. The MCU controller outputs a low level through other I / Os in sequence, and then the low levels that appear in sequence at the I / O port are connected to the lower bias resistor of the reference source chip U2. By changing the number of parallel edges of the lower bias resistor, the size of its parallel resistance is changed, and then the input control voltage of the reference source chip U2 is changed. The reference source chip U2 outputs different currents according to the size of the input control voltage. The control voltage is high, the pull-down current of the reference source chip U2 is large, and then the luminous intensity of the optocoupler is large, and the electrical signal fed back to the FB end of the PWM controller is large. Since the FB end is negative feedback, the voltage output from Q2 is high, and vice versa, the voltage output from Q2 is low. This method is used to achieve the selection and switching of the output voltage.

[0042] In some embodiments, the switching power supply circuit also includes an MCU controller power supply circuit 3, and the MCU controller power supply circuit 3 includes a depletion-type MOS tube and an LDO regulator. The drain of the depletion-type MOS tube is connected to the output end of the voltage conversion circuit, and the source is connected to the input end of the LDO regulator. The gate of the depletion-type MOS tube and the control end of the LDO regulator are grounded, and the output end of the LDO regulator supplies power to the MCU controller. According to the characteristics of the depletion-type MOS tube, when the output voltage reaches 20-48V, the depletion-type MOS tube Q1 starts to work and plays a role in reducing the voltage, and the output voltage of the depletion-type MOS tube is finally maintained at about 16-24V. When the output voltage is lower than 20V, the depletion-type MOS tube Q1 does not participate in the voltage reduction, and the voltage reduction is handed over to the LDO regulator U1 to perform voltage stabilization. U1 stabilizes the output voltage at about 5V, and the MCU controller provides a stable working voltage;

[0043] In some embodiments, the variable power supply output circuit further includes a switching power supply constant power control circuit, and the switching power supply constant power control circuit is used to perform constant power control on the electrical signal of the voltage at both ends of the wide voltage when the wide voltage is output; the switching power supply constant power control circuit includes a transformer auxiliary VCC winding, a PWM controller, a low voltage output constant power clamp circuit, a high voltage output constant power compensation circuit, a fourth switch tube Q2, a third resistor R1 and a fourth resistor R4, the transformer auxiliary VCC winding senses and samples the voltage of the voltage output circuit, the drain of the fourth switch tube Q2 is connected to the output end of the power supply, the gate of the fourth switch tube Q2 is connected to the driving output end of the PWM controller, the source of the fourth switch tube Q2 is respectively connected to the first end of the third resistor R1 and the first end of the fourth resistor R4, the second end of the third resistor R1 is grounded, the second end of the fourth resistor R4 is connected to the CS end of the PWM controller, and the input end and the output end of the low voltage output constant power clamp circuit are connected in parallel to the photoelectric receiver CE in the photoelectric coupler. At two ends, the emitter of the photoelectric receiver E of the photoelectric coupler is grounded, and the collector of the photoelectric receiver C of the photoelectric coupler is connected to the FB port of the PWM controller. The low-voltage output constant power clamping circuit is used to clamp the voltage when the output voltage of the variable power supply output circuit is lower than the minimum voltage of the variable voltage so that the voltage tends to the minimum voltage; the first end of the high-voltage output constant power compensation circuit is connected to the voltage output end of the induction coil, and the second end of the high-voltage output constant power compensation circuit is connected to the CS pin of the PWM controller. The high-voltage output constant power compensation circuit is used to reversely compensate the voltage when the output voltage of the variable power supply output circuit is higher than the maximum value of the variable voltage so that the output voltage of the PWM tends to the maximum value of the variable voltage.

[0044] In some embodiments, the low voltage output constant power clamp circuit includes a first voltage stabilizing diode D1 and a fifth resistor R3, wherein the positive end of the first voltage stabilizing diode D1 is grounded, the negative end is connected to the first end of the fifth resistor R3, the second end of the fifth resistor R3 is connected to the collector of the photoelectric receiver E of the photoelectric coupler, and the collector of the photoelectric receiver E of the photoelectric coupler is connected to the FB port of the PWM controller. When the output voltage of the variable power supply output circuit is less than the preset minimum output voltage of the variable power supply output circuit, its output current is greater than the current at its minimum output voltage, thereby causing the current input to the FB port of the PWM controller to increase, and by setting the first voltage stabilizing diode D1. When the voltage of the variable power supply output circuit is lower than the preset minimum voltage value, the low voltage is clamped by the low voltage output constant power clamp circuit, so that the power is constant when the low voltage is output.

[0045] In some embodiments, the high voltage output constant power compensation circuit includes a sixth resistor R5 and a second voltage zener diode D2, the anode of the second voltage zener diode D2 is connected to the first end of the sixth resistor R5, the second end of the sixth resistor R5 is connected to the CS port of the PWM controller, and the cathode of the second voltage zener diode D2 is connected to the voltage output end of the induction coil. When the output voltage of the variable power supply output circuit is higher than the maximum voltage of its preset output, the VCC supply voltage will increase with the increase of the output power. By adding a compensation circuit to the CS pin, when the VCC voltage reaches the breakdown voltage of the second voltage zener diode D2, the breakdown voltage will be applied to the CS pin, thereby realizing the constant power mode.

[0046] Through the above power constant circuit design, it is possible to keep the input power constant within a certain range of the rated power in a wide voltage output state. The specific range can be determined by adjusting the voltage regulation range of the first voltage regulator tube and the second voltage regulator tube.

[0047] The variable power output circuit can provide various types of voltage outputs for LED lamps and maintain their power stability.

[0048] A method for automatically identifying a lamp belt voltage of a wide voltage output automatic identification lamp belt switch power supply circuit, comprising:

[0049] The variable power output circuit cyclically outputs the variable power in sequence from a low voltage output value point to a high voltage output value point;

[0050] The light strip voltage collection and voltage locking control circuit collects the induced voltage of the light strip. When the induction resistor in series with the light strip collects the induced voltage for the first time, the light strip voltage collection and voltage locking control circuit locks the output voltage of the variable power supply output circuit to power the light strip. Otherwise, the variable power supply output circuit will cycle the output voltage from the low voltage output value point to the high voltage output value point in sequence until the light strip voltage collection and voltage locking control circuit collects the induced voltage.

[0051] The specific principle of the method can be found in the explanation of the circuit, which will not be repeated here.

[0052] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A wide voltage output automatic identification light strip switch power supply circuit, characterized in that: It includes a variable power supply output circuit, a light strip voltage collection and voltage locking control circuit, the variable power supply output circuit is used to cyclically output the variable power supply from a low voltage value to a high voltage value in sequence, the light strip voltage collection and voltage locking control circuit is used to lock the output voltage of the variable power supply output circuit to power the light strip after the collected voltage of the light strip matches a certain output voltage of the variable power supply output circuit, the variable power supply output circuit also includes a switching power supply constant power control circuit, the switching power supply constant power control circuit is used to perform constant power control on the electrical signal of the voltage at both ends of the wide voltage when the wide voltage is output; The switching power supply constant power control circuit comprises a low voltage output constant power clamp circuit and a high voltage output constant power compensation circuit, wherein the low voltage output constant power clamp circuit is used to clamp the voltage when the output voltage of the variable power supply output circuit is lower than the minimum voltage of the variable voltage so that the voltage tends to the minimum voltage; The high voltage output constant power compensation circuit is used to reversely compensate the voltage when the output voltage of the variable power supply output circuit is higher than the maximum value of the variable voltage, so that the output voltage of the PWM tends to the maximum value of the variable voltage.

2. The wide voltage output automatic identification light strip switch power supply circuit as claimed in claim 1, characterized in that: The variable power supply output circuit includes an MCU controller, and the lamp strip voltage collection and voltage locking control circuit includes a sensing resistor Rs, a first switch tube Q4, and a second switch tube Q5. The sensing resistor Rs is connected in series with the lamp strip, and the first end of the sensing resistor Rs is also connected to the input end of the MCU controller. The second end of the sensing resistor Rs is also connected to the second end of the first switch tube Q4 and the second end of the second switch tube Q5 respectively. The first end of the first switch tube Q4 is connected to the output end of the MCU controller, the control end of the first switch tube Q4 is connected to the driving end of the MCU controller, and the second end of the first switch tube Q4 is also connected to the control end of the second switch Q5.

3. The wide voltage output automatic identification light strip switch power supply circuit as claimed in claim 2, characterized in that: The first switch tube Q4 is a triode, and the second switch Q5 is a MOS tube.

4. The wide voltage output automatic identification light strip switch power supply circuit as claimed in claim 2, characterized in that: The variable power supply output circuit also includes a power supply, a voltage conversion circuit, a voltage output circuit and an output voltage adjustment circuit. The power supply is used to provide the total power supply of the system. The voltage conversion circuit is used to convert the voltage of the power supply into a voltage output within a certain range. The input end of the voltage output circuit is connected to the output end of the voltage conversion circuit, the output end of the voltage output circuit is grounded, the output end of the output voltage adjustment circuit is connected to the control end of the voltage output circuit, and the output voltage adjustment circuit changes the voltage of the voltage output circuit by adjusting and controlling the current of the voltage output circuit.

5. The wide voltage output automatic identification light strip switch power supply circuit as claimed in claim 4, characterized in that: The voltage output circuit includes a third switch tube Q3, a first resistor R7 and a controllable voltage-stabilizing diode U2. The input end of the third switch tube Q3 is connected to the output end of the voltage conversion circuit, the output end of the third switch tube Q3 is connected to the first end of the first resistor R7, the control end of the third switch tube Q3 is connected to the input end of the third switch tube Q3 through the second resistor R8, the second end of the first resistor R7 is connected to the cathode of the controllable voltage-stabilizing diode U2, and the control end of the controllable voltage-stabilizing diode U2 is connected to the output end of the output voltage adjustment circuit.

6. The wide voltage output automatic identification light strip switch power supply circuit as claimed in claim 5, characterized in that: The voltage output circuit further includes a photocoupler, wherein the anode of the light emitting diode PCA in the photocoupler is connected to the second end of the first resistor R7, and the cathode of the light emitting diode PCA in the photocoupler is connected to the cathode of the controllable voltage stabilizing diode U2.

7. The wide voltage output automatic identification light strip switch power supply circuit as claimed in claim 4, characterized in that: The output voltage adjustment circuit includes several groups of down-bias resistors, a voltage selection key, a first voltage-dividing resistor R14 and a second voltage-dividing resistor R15, wherein the first end of each group of down-bias resistors is respectively connected to an IO port of the MCU controller, the second end of each group of down-bias resistors is respectively connected to the first end of the first voltage-dividing resistor R14, the second end of the first voltage-dividing resistor R14 is grounded, the first end of the second voltage-dividing resistor R15 is connected to the output end of the voltage conversion circuit, the second end of the second voltage-dividing resistor R15 is respectively connected to the second end of each group of down-bias resistors, the voltage selection key is connected to the MCU controller, and through the operation of the external key, the IO port connected to the down-bias resistor is sequentially pulled down to the ground, and the resistors connected in series to the IO port are sequentially connected in parallel with the first voltage-dividing resistor R14.

8. The wide voltage output automatic identification light strip switch power supply circuit as claimed in claim 4, characterized in that: The variable power supply output circuit also includes an MCU controller power supply circuit, which includes a depletion-type MOS tube and an LDO regulator. The drain of the depletion-type MOS tube is connected to the output end of the voltage conversion circuit, and the source is connected to the input end of the LDO regulator. The gate of the depletion-type MOS tube and the control end of the LDO regulator are grounded, and the output end of the LDO regulator supplies power to the MCU controller.

9. The wide voltage output automatic identification light strip switch power supply circuit as claimed in claim 6, characterized in that: The switching power supply constant power control circuit also includes a transformer auxiliary VCC winding, a PWM controller, a fourth switch tube Q2, a third resistor R1 and a fourth resistor R4. The transformer auxiliary VCC winding senses and samples the voltage of the voltage output circuit. The drain of the fourth switch tube Q2 is connected to the output end of the power supply, the gate of the fourth switch tube Q2 is connected to the driving output end of the PWM controller, the source of the fourth switch tube Q2 is respectively connected to the first end of the third resistor R1 and the first end of the fourth resistor R4, the second end of the third resistor R1 is grounded, and the second end of the fourth resistor R4 is connected to the CS end of the PWM controller. The input end and the output end of the low voltage output constant power clamp circuit are connected in parallel to the two ends of the photoelectric receiver CE in the photoelectric coupler, the emitter of the photoelectric receiver E of the photoelectric coupler is grounded, and the collector of the photoelectric receiver C of the photoelectric coupler is connected to the FB port of the PWM controller; the first end of the high voltage output constant power compensation circuit is connected to the voltage output end of the induction coil, and the second end of the high voltage output constant power compensation circuit is connected to the CS pin of the PWM controller.

10. The method for automatically identifying the voltage of a light strip of a wide voltage output automatic identification light strip switch power supply circuit according to any one of claims 1 to 9, characterized in that: The method comprises: The variable power output circuit cyclically outputs the variable power in sequence from a low voltage output value point to a high voltage output value point; The light strip voltage collection and voltage locking control circuit collects the induced voltage of the light strip. When the induction resistor in series with the light strip collects the induced voltage for the first time, the light strip voltage collection and voltage locking control circuit locks the output voltage of the variable power supply output circuit to power the light strip. Otherwise, the variable power supply output circuit will cycle the output voltage from the low voltage output value point to the high voltage output value point in sequence until the light strip voltage collection and voltage locking control circuit collects the induced voltage.

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