LED strip controller reverse connection protection circuit and lamps

Abstract

This invention provides a reverse connection protection circuit for a light strip controller and a light fixture. The circuit includes a positive input terminal, a negative input terminal, a rectifier circuit, a reverse connection protection control circuit, a relay switch, a first switching transistor that is high-level conducting, a positive output terminal, and a negative output terminal. The positive input terminal is electrically connected to the positive output terminal through the switching path of the relay switch. The input terminal of the reverse connection protection control circuit is electrically connected to the positive input terminal. The first electromagnetic terminal of the relay switch is electrically connected to the positive output terminal of the rectifier circuit, and the second electromagnetic terminal of the relay switch is electrically connected to the first pole of the first switching transistor. The second pole of the first switching transistor is grounded. The output terminal of the reverse connection protection control circuit is electrically connected to the control terminal of the first switching transistor. The reverse connection protection control circuit controls the switching path to conduct when a positive voltage is input to the positive input terminal and controls the switching path to close when a negative voltage is input to the positive input terminal. Applying this invention can prevent reverse polarity connection of the power supply and improve circuit safety.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, specifically to a reverse connection protection circuit for a light strip controller, and also to a lighting fixture using the reverse connection protection circuit for the light strip controller. Background Technology

[0002] Common constant voltage LED strip control circuits on the market include Figure 1 As shown, the circuit operates normally when the positive input terminal V1 is positive and the negative input terminal V2 is negative. When the input V1 is negative and the input V2 is positive, the positive voltage passes through the diode inside the switching transistor Q, and then through diode D to V1, forming a short-circuit loop that short-circuits the input DC power supply. This circuit relies on the short-circuit protection function of the preceding stage's input power supply to protect the LED strip controller. However, the protection effect is not ideal, and the preceding stage's input power supply protection function is required. If a power supply without protection is connected, there is a risk of damage to the controller.

[0003] Therefore, a more optimized reverse connection protection circuit for the LED strip controller needs to be considered. Utility Model Content

[0004] The primary objective of this invention is to provide a reverse connection protection circuit for a light strip controller that can prevent reverse polarity connection of the power supply and improve circuit safety.

[0005] The second objective of this invention is to provide a lamp that can prevent reverse polarity of the power supply and improve circuit safety.

[0006] To achieve the aforementioned first objective, the reverse connection protection circuit for the LED strip controller provided by this utility model includes a positive input terminal, a negative input terminal, a rectifier circuit, a reverse connection protection control circuit, a relay switch, a first switching transistor that is high-level conducting, a positive output terminal, and a negative output terminal. The first input terminal of the rectifier circuit is electrically connected to the positive input terminal, and the second input terminal of the rectifier circuit is electrically connected to the negative input terminal. The positive input terminal is electrically connected to the positive output terminal through the switching path of the relay switch. The input terminal of the reverse connection protection control circuit is electrically connected to the positive input terminal. The first electromagnetic terminal of the relay switch is electrically connected to the positive output terminal of the rectifier circuit, and the second electromagnetic terminal of the relay switch is electrically connected to the first pole of the first switching transistor. The second pole of the first switching transistor is grounded. The output terminal of the reverse connection protection control circuit is electrically connected to the control terminal of the first switching transistor, and the negative output terminal is electrically connected to the negative input terminal. The reverse connection protection control circuit is used to control the switching path to conduct when a positive voltage is input to the positive input terminal and to control the switching path to close when a negative voltage is input to the positive input terminal.

[0007] As can be seen from the above scheme, the reverse connection protection circuit of the LED strip controller of this utility model is configured with a reverse connection protection control circuit, a relay switch, and a first switch tube that is turned on at a high level. The reverse connection protection control circuit is used to control the switch path of the relay switch to be turned on when a positive voltage is input to the positive input terminal, and to control the switch path to be turned off when a negative voltage is input to the positive input terminal. This allows the lamp to be powered normally when the power supply polarity is normal, and to cut off the power supply circuit when the power supply polarity is reversed, thus playing a role in protecting the circuit.

[0008] In a further embodiment, the reverse connection protection control circuit includes a first diode, the positive terminal of which is electrically connected to the positive input terminal, and the negative terminal of which is electrically connected to the control terminal of the first switching transistor.

[0009] Therefore, the reverse connection protection control circuit sets up a first diode so that when a positive voltage is input to the positive input terminal, the first diode conducts and sends a high level to the first switching transistor, thereby controlling the switching path to be open. When a negative voltage is input to the positive input terminal, the first diode is cut off and sends a low level to the first switching transistor, thereby controlling the switching path to be closed.

[0010] In a further embodiment, a first current-limiting resistor is connected in series with either the positive or negative terminal of the first diode.

[0011] Therefore, by connecting a first current-limiting resistor in series with the positive or negative terminal of the first diode, excessive current can be avoided from damaging the first switching transistor.

[0012] In a further embodiment, the reverse connection protection control circuit includes a first diode and a main control chip. The positive terminal of the first diode is electrically connected to the positive input terminal, the negative terminal of the first diode is electrically connected to the polarity detection pin of the main control chip, and the output terminal of the main control chip is electrically connected to the control terminal of the first switching transistor.

[0013] Therefore, it can be seen that the reverse connection protection control circuit, by setting a first diode and a main control chip, can use the main control chip to detect the voltage output of the first diode, confirm the voltage polarity, and then send a control signal to the control terminal of the first switching transistor, thereby improving the safety of the control and avoiding false triggering.

[0014] In a further embodiment, the reverse connection protection circuit of the LED strip controller also includes a light-emitting diode (LED). The positive terminal of the LED is electrically connected to the second electromagnetic terminal of the relay switch, and the negative terminal of the LED is electrically connected to the first terminal of the first switching transistor.

[0015] Therefore, by setting up an LED, the positive and negative connections of the power supply can be indicated so that the user can be informed.

[0016] In a further embodiment, the reverse connection protection circuit of the LED strip controller also includes a second diode, with the negative terminal of the second diode electrically connected to the positive output terminal and the positive terminal of the second diode electrically connected to the negative output terminal.

[0017] Therefore, by connecting a second diode in parallel between the positive and negative output terminals, the induced voltage in the LED strip load can be discharged, and the residual charge can be quickly released when the circuit is powered off.

[0018] In a further embodiment, the reverse connection protection circuit of the light strip controller also includes a PWM control circuit and a second switching transistor. The power supply terminal of the PWM control circuit is electrically connected to the positive output terminal of the rectifier circuit, the output terminal of the PWM control circuit is electrically connected to the control terminal of the second switching transistor, the first terminal of the second switching transistor is electrically connected to the negative output terminal, and the second terminal of the second switching transistor is electrically connected to the negative input terminal.

[0019] Therefore, by setting up a PWM control circuit and a second switching transistor, the PWM control circuit can output a PWM signal to control the second switching transistor to dim the LED strip.

[0020] In a further embodiment, a second current-limiting resistor is connected in series between the output terminal of the PWM control circuit and the control terminal of the second switching transistor.

[0021] Therefore, by connecting a second current-limiting resistor in series between the output terminal of the PWM control circuit and the control terminal of the second switching transistor, excessive current amplification can be avoided, thus protecting the second switching transistor.

[0022] To achieve the second objective of this utility model, the lamp provided by this utility model is equipped with a reverse connection protection circuit for a light strip controller and an LED light strip. The reverse connection protection circuit for the light strip controller uses the aforementioned reverse connection protection circuit for a light strip controller. The positive terminal of the LED light strip is electrically connected to the positive output terminal, and the negative terminal of the LED light strip is electrically connected to the negative output terminal. Attached Figure Description

[0023] Figure 1 This is the circuit diagram of an existing constant voltage LED strip control circuit.

[0024] Figure 2 This is a circuit diagram of the first embodiment of the lamp of this utility model.

[0025] Figure 3 This is a circuit diagram of the second embodiment of the lamp of this utility model.

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0027] First embodiment of the lamp:

[0028] like Figure 2 As shown, in this embodiment, the lamp is equipped with a reverse connection protection circuit for the LED strip controller and an LED strip 6. The reverse connection protection circuit for the LED strip controller is used to control the operation of the LED strip 6.

[0029] In this embodiment, the reverse connection protection circuit of the LED strip controller includes a positive input terminal Vin1, a negative input terminal Vin2, a rectifier circuit 1, a reverse connection protection control circuit 2, a relay switch K1, a first switch Q1 that is high-level conducting, a positive output terminal Vout1, and a negative output terminal Vout2. The first input terminal of the rectifier circuit 1 is electrically connected to the positive input terminal Vin1, and the second input terminal of the rectifier circuit 1 is electrically connected to the negative input terminal Vin2. The positive input terminal Vin1 is electrically connected to the positive output terminal Vout1 through the switching path of the relay switch K1. The input terminal of the reverse connection protection control circuit 2 is electrically connected to the positive input terminal Vin1. The first electromagnetic terminal of the relay switch K1 is electrically connected to the positive output terminal of the rectifier circuit 1, and the second electromagnetic terminal of the relay switch K1 is electrically connected to the first pole of the first switch Q1. The second pole of the first switch Q1 is grounded. The output terminal of the reverse connection protection control circuit 2 is electrically connected to the control terminal of the first switch Q1. The negative output terminal Vout2 is electrically connected to the negative input terminal Vin2. The positive terminal of LED strip 6 is electrically connected to the positive output terminal Vout1, and the negative terminal of LED strip 6 is electrically connected to the negative output terminal Vout2. The reverse connection protection control circuit 2 controls the switch path to be open when a positive voltage is input to the positive input terminal Vin1, and controls the switch path to be closed when a negative voltage is input to the positive input terminal Vin1. Preferably, the first switching transistor Q1 is an NPN transistor.

[0030] In this embodiment, the reverse connection protection control circuit 2 includes a first diode D1 and a main control chip 3. The positive terminal of the first diode D1 is electrically connected to the positive input terminal Vin1, and the negative terminal of the first diode D1 is electrically connected to the polarity detection pin of the main control chip 3. The output terminal of the main control chip 3 is electrically connected to the control terminal of the first switching transistor Q1. The main control chip 3 is used to send a high-level signal to the first switching transistor Q1 when the first diode D1 outputs a high-level signal, and to send a low-level signal to the first switching transistor Q1 when the first diode D1 outputs a low-level signal. By configuring the first diode D1 and the main control chip 3, the reverse connection protection control circuit 2 can use the main control chip 3 to detect the voltage output of the first diode D1, confirm the voltage polarity, and then send a control signal to the control terminal of the first switching transistor Q1, thereby improving the safety of the control and avoiding false triggering.

[0031] A first current-limiting resistor R1 is connected in series with either the positive or negative terminal of the first diode D1. In this embodiment, the positive terminal of the first diode D1 is connected in series with the first current-limiting resistor R1. By connecting the first current-limiting resistor R1 in series with either the positive or negative terminal of the first diode D1, excessive current that could damage the main control chip 3 can be avoided.

[0032] In this embodiment, the reverse connection protection circuit of the LED strip controller also includes a light-emitting diode (LED) 4. The positive terminal of the LED 4 is electrically connected to the second electromagnetic terminal of the relay switch K1, and the negative terminal of the LED 4 is electrically connected to the first terminal of the first switching transistor Q1. By setting the LED 4, the positive and negative connection of the power supply can be indicated. When the input power supply of the positive input terminal Vin1 and the negative input terminal Vin2 is connected in the correct direction, the LED 4 lights up; when the input power supply of the positive input terminal Vin1 and the negative input terminal Vin2 is reversed, the LED 4 turns off, so that the user can be informed.

[0033] The reverse connection protection circuit of the LED strip controller also includes a second diode D2. The negative terminal of the second diode D2 is electrically connected to the positive output terminal Vout1, and the positive terminal of the second diode D2 is electrically connected to the negative output terminal Vout2. By connecting the second diode D2 in parallel between the positive output terminal Vout1 and the negative output terminal Vout2, the induced voltage in the LED strip load can be discharged, and the residual charge can be quickly released when the circuit is powered off.

[0034] In this embodiment, the reverse connection protection circuit of the LED strip controller further includes a PWM control circuit 5 and a second switch Q2. The power supply terminal of the PWM control circuit 5 is electrically connected to the positive output terminal of the rectifier circuit 1, and the output terminal of the PWM control circuit 5 is electrically connected to the control terminal of the second switch Q2. The first terminal of the second switch Q2 is electrically connected to the negative output terminal Vout2, and the second terminal of the second switch Q2 is electrically connected to the negative input terminal Vin2. A second current-limiting resistor R2 is connected in series between the output terminal of the PWM control circuit 5 and the control terminal of the second switch Q2. Preferably, the PWM control circuit 5 adopts a known wireless remote control PWM control circuit. The second switch Q2 is an NMOS transistor. By setting the PWM control circuit 5 and the second switch Q2, the PWM control circuit 5 can output a PWM signal to control the second switch Q2 to dim the LED strip. Connecting the second current-limiting resistor R2 in series between the output terminal of the PWM control circuit 5 and the control terminal of the second switch Q2 can prevent excessive current amplification and protect the second switch Q2.

[0035] In this embodiment, when the reverse connection protection circuit of the LED strip controller is working, if DC voltages are input to the positive input terminal Vin1 and the negative input terminal Vin2, and the positive input terminal Vin1 is positive and the negative input terminal Vin2 is negative, the input voltage is rectified by the rectifier circuit 1, and a positive output voltage is supplied to the reverse connection protection control circuit 2 and the relay switch K1. The main control chip 3 determines the polarity of the positive input terminal Vin1. Since the positive input terminal Vin1 is positive, the positive voltage is limited by the first current-limiting resistor R1, and then supplied to the polarity detection pin of the main control chip 3 through the first diode D1. After the main control chip 3 detects the high level, it sends a high level to the first switch Q1, causing the first switch Q1 to be forward biased and conducting. At this time, the switching path of the relay switch K1 is opened, supplying power to the LED strip 6, and the LED strip controller works normally. At the same time, the PWM control circuit 5 outputs a PWM signal through the second current-limiting resistor R2 to the second switch Q2 to dim the LED strip 6.

[0036] When DC voltages are input to the positive input terminal Vin1 and the negative input terminal Vin2, and the negative input terminal Vin2 is positive, the main control chip 3 determines the polarity of the positive input terminal Vin1. Since the positive input terminal Vin1 is negative, it cannot pass through the first diode D1. Therefore, the main control chip 3 detects a low level. At this time, the main control chip 3 sends a low level to the first switching transistor Q1, causing the first switching transistor Q1 to be reverse biased and cut off. The switching path of the relay switch K1 is broken, and a loop cannot be formed, thus playing the role of protecting the circuit.

[0037] As can be seen from the above, the reverse connection protection circuit of the LED strip controller of this utility model is configured with a reverse connection protection control circuit 2, a relay switch K1, and a first switch Q1 that is turned on at a high level. The reverse connection protection control circuit 2 is used to control the switch path of the relay switch K1 to be turned on when a positive voltage is input to the positive input terminal Vin1, and to control the switch path to be turned off when a negative voltage is input to the positive input terminal Vin1. This allows the lamp to be powered normally when the power supply polarity is normal, and to cut off the power supply circuit when the power supply polarity is reversed, thus playing a role in protecting the circuit.

[0038] Second embodiment of the lamp:

[0039] like Figure 3 As shown, in this embodiment, the lamp is equipped with a reverse connection protection circuit for the LED strip controller and an LED strip 60. The reverse connection protection circuit for the LED strip controller is used to control the operation of the LED strip 60.

[0040] In this embodiment, the reverse connection protection circuit of the LED strip controller includes a positive input terminal Vin10, a negative input terminal Vin20, a rectifier circuit 10, a reverse connection protection control circuit 20, a relay switch K10, a first switch transistor Q10 that is turned on at a high level, a positive output terminal Vout10, and a negative output terminal Vout20. The first input terminal of the rectifier circuit 10 is electrically connected to the positive input terminal Vin10, and the second input terminal of the rectifier circuit 10 is electrically connected to the negative input terminal Vin20. The positive input terminal Vin10 is connected to the relay switch K10. The switching path is electrically connected to the positive output terminal Vout10. The input terminal of the reverse connection protection control circuit 20 is electrically connected to the positive input terminal Vin10. The first electromagnetic terminal of the relay switch K10 is electrically connected to the positive output terminal of the rectifier circuit 10. The second electromagnetic terminal of the relay switch K10 is electrically connected to the first electrode of the first switching transistor Q10. The second electrode of the first switching transistor Q10 is grounded. The output terminal of the reverse connection protection control circuit 20 is electrically connected to the control terminal of the first switching transistor Q10. The negative output terminal Vout20 is electrically connected to the negative input terminal Vin20. The positive terminal of the LED strip 60 is electrically connected to the positive output terminal Vout10, and the negative terminal of the LED strip 60 is electrically connected to the negative output terminal Vout20. The reverse connection protection control circuit 20 is used to control the switching path to conduct when a positive voltage is input to the positive input terminal Vin10, and to control the switching path to close when a negative voltage is input to the positive input terminal Vin10. Preferably, the first switching transistor Q10 is an NPN transistor.

[0041] In this embodiment, the reverse connection protection control circuit includes a first diode D10. The positive terminal of the first diode D10 is electrically connected to the positive input terminal Vin10, and the negative terminal of the first diode D10 is electrically connected to the control terminal of the first switching transistor Q10. The reverse connection protection control circuit sets the first diode D10 so that when a positive voltage is input to the positive input terminal Vin10, the first diode D10 conducts, sending a high-level signal to the first switching transistor Q10, thereby controlling the switching path to be open. When a negative voltage is input to the positive input terminal Vin10, the first diode D10 is cut off, sending a low-level signal to the first switching transistor Q10, thereby controlling the switching path to be closed.

[0042] A first current-limiting resistor R10 is connected in series with either the positive or negative terminal of the first diode D10. In this embodiment, the negative terminal of the first diode D10 is connected in series with the first current-limiting resistor R10. By connecting the first current-limiting resistor R10 in series with either the positive or negative terminal of the first diode D10, excessive current that could damage the first switching transistor Q10 can be avoided.

[0043] In this embodiment, the reverse connection protection circuit of the LED strip controller also includes a light-emitting diode (LED) 40. The positive terminal of the LED 40 is electrically connected to the second electromagnetic terminal of the relay switch K10, and the negative terminal of the LED 40 is electrically connected to the first terminal of the first switching transistor Q10. By setting the LED 40, the positive and negative power supply connections can be indicated. When the input power supply at the positive input terminal Vin10 and the negative input terminal Vin20 is connected in the correct direction, the LED 40 lights up; when the input power supply at the positive input terminal Vin10 and the negative input terminal Vin20 is connected in the reverse direction, the LED 40 turns off, so that the user can be informed.

[0044] The reverse connection protection circuit of the LED strip controller also includes a second diode D20. The negative terminal of the second diode D20 is electrically connected to the positive output terminal Vout10, and the positive terminal of the second diode D20 is electrically connected to the negative output terminal Vout20. By connecting the second diode D20 in parallel between the positive output terminal Vout10 and the negative output terminal Vout20, the induced voltage in the LED strip load can be discharged, and the residual charge can be quickly released when the circuit is powered off.

[0045] In this embodiment, the reverse connection protection circuit of the LED strip controller further includes a PWM control circuit 50 and a second switch Q20. The power supply terminal of the PWM control circuit 50 is electrically connected to the positive output terminal of the rectifier circuit 10, and the output terminal of the PWM control circuit 50 is electrically connected to the control terminal of the second switch Q20. The first terminal of the second switch Q20 is electrically connected to the negative output terminal Vout20, and the second terminal of the second switch Q20 is electrically connected to the negative input terminal Vin20. A second current-limiting resistor R20 is connected in series between the output terminal of the PWM control circuit 50 and the control terminal of the second switch Q20. Preferably, the PWM control circuit 50 adopts a known wireless remote control PWM control circuit. The second switch Q20 is an NMOS transistor. By setting the PWM control circuit 50 and the second switch Q20, the PWM control circuit 50 can output a PWM signal to control the second switch Q20 to dim the LED strip. Connecting the second current-limiting resistor R20 in series between the output terminal of the PWM control circuit 50 and the control terminal of the second switch Q20 can prevent excessive current amplification and protect the second switch Q20.

[0046] In this embodiment, when the reverse connection protection circuit of the LED strip controller is working, if DC voltages are input to the positive input terminal Vin10 and the negative input terminal Vin20, and the positive input terminal Vin10 is positive and the negative input terminal Vin20 is negative, the input voltage is rectified by the rectifier circuit 10, and a positive output voltage is used to power the relay switch K10. Because the positive input terminal Vin10 is positive, the positive voltage passes through the first diode D10, and then through the first current-limiting resistor R10, sending a high level to the first switch Q10, causing the first switch Q10 to be forward-biased and conducting. At this time, the switching path of the relay switch K10 is turned on, powering the LED strip 60, and the LED strip controller works normally. At the same time, the PWM control circuit 50 outputs a PWM signal through the second current-limiting resistor R20 to the second switch Q20 to dim the LED strip 60.

[0047] When DC voltages are input to the positive input terminal Vin10 and the negative input terminal Vin20, and the negative input terminal Vin20 is positive, the positive input terminal Vin10 is negative, so the first diode D10 cannot pass through. At this time, the control terminal of the first switching transistor Q10 is at a low level, causing the first switching transistor Q10 to be reverse biased and cut off. The switching path of the relay switch K10 is broken, and a circuit cannot be formed, thus playing the role of protecting the circuit.

[0048] It should be noted that the above are only preferred embodiments of the present utility model, but the design concept of the utility model is not limited thereto. Any non-substantial modifications made to the present utility model using this concept shall also fall within the protection scope of the present utility model.

Claims

1. A reverse connection protection circuit for a light strip controller, characterized in that: The device includes a positive input terminal, a negative input terminal, a rectifier circuit, a reverse connection protection control circuit, a relay switch, a first switching transistor that is high-level conducting, a positive output terminal, and a negative output terminal. The first input terminal of the rectifier circuit is electrically connected to the positive input terminal, and the second input terminal of the rectifier circuit is electrically connected to the negative input terminal. The positive input terminal is electrically connected to the positive output terminal through the switching path of the relay switch. The input terminal of the reverse connection protection control circuit is electrically connected to the positive input terminal. The first electromagnetic terminal of the relay switch is electrically connected to the positive output terminal of the rectifier circuit. The second electromagnetic terminal of the relay switch is electrically connected to the first pole of the first switching transistor, and the second pole of the first switching transistor is grounded. The output terminal of the reverse connection protection control circuit is electrically connected to the control terminal of the first switching transistor. The negative output terminal is electrically connected to the negative input terminal. The reverse connection protection control circuit is used to control the switching path to be turned on when a positive voltage is input to the positive input terminal, and to control the switching path to be turned off when a negative voltage is input to the positive input terminal.

2. The reverse connection protection circuit for the LED strip controller according to claim 1, characterized in that: The reverse connection protection control circuit includes a first diode, the positive terminal of which is electrically connected to the positive input terminal, and the negative terminal of which is electrically connected to the control terminal of the first switching transistor.

3. The reverse connection protection circuit for the LED strip controller according to claim 2, characterized in that: The positive or negative terminal of the first diode is connected in series with a first current-limiting resistor.

4. The reverse connection protection circuit for the LED strip controller according to claim 1, characterized in that: The reverse connection protection control circuit includes a first diode and a main control chip. The positive terminal of the first diode is electrically connected to the positive input terminal, the negative terminal of the first diode is electrically connected to the polarity detection pin of the main control chip, and the output terminal of the main control chip is electrically connected to the control terminal of the first switching transistor.

5. The reverse connection protection circuit for the LED strip controller according to any one of claims 1 to 4, characterized in that: The reverse connection protection circuit of the LED strip controller also includes a light-emitting diode (LED). The positive terminal of the LED is electrically connected to the second electromagnetic terminal of the relay switch, and the negative terminal of the LED is electrically connected to the first terminal of the first switching transistor.

6. The reverse connection protection circuit for the LED strip controller according to any one of claims 1 to 4, characterized in that: The reverse connection protection circuit of the LED strip controller also includes a second diode, the negative terminal of which is electrically connected to the positive output terminal, and the positive terminal of which is electrically connected to the negative output terminal.

7. The reverse connection protection circuit for the LED strip controller according to any one of claims 1 to 4, characterized in that: The reverse connection protection circuit of the LED strip controller also includes a PWM control circuit and a second switching transistor. The power supply terminal of the PWM control circuit is electrically connected to the positive output terminal of the rectifier circuit, the output terminal of the PWM control circuit is electrically connected to the control terminal of the second switching transistor, the first terminal of the second switching transistor is electrically connected to the negative output terminal, and the second terminal of the second switching transistor is electrically connected to the negative input terminal.

8. The reverse connection protection circuit for the LED strip controller according to claim 7, characterized in that: A second current-limiting resistor is connected in series between the output terminal of the PWM control circuit and the control terminal of the second switching transistor.

9. A lighting fixture, comprising a reverse connection protection circuit for a light strip controller and an LED light strip, characterized in that: The reverse connection protection circuit of the LED strip controller is the LED strip controller reverse connection protection circuit according to any one of claims 1 to 8; The positive terminal of the LED light strip is electrically connected to the positive output terminal, and the negative terminal of the LED light strip is electrically connected to the negative output terminal.

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