Lighting switching control circuit

Abstract

The utility model discloses an illumination switching control circuit, which is used for controlling a first illumination unit and a second illumination unit, and comprises a first control unit, a second control unit and a control unit, the first switch unit is connected with the bias voltage, the first control unit and the second end of the first lighting unit, and on-off of the first switch unit is controlled based on the first control signal and the bias voltage so as to control on or off of the first lighting unit; the second control unit is used for generating a second control signal based on the second control voltage; the second switch unit is connected between the bias voltage and the first end of the second lighting unit, is connected with the second control unit, and is used for controlling the on / off of the second switch unit based on the second control signal and the bias voltage so as to control the on / off of the second lighting unit; the first control voltage and / or the second control voltage is energized to energize the bias voltage. According to the utility model, the independent switching control of the high beam and the low beam can be realized, especially the high beam can be independently turned on.

Description

Technical Field

[0001] This utility model belongs to the field of integrated circuit technology, specifically relating to a lighting switching control circuit. Background Technology

[0002] The lighting switching control circuit is part of the vehicle's headlight control circuit, used to control the on / off state of the vehicle's high beam and low beam headlights. Most existing headlights connect the high beam and low beam in series. When the high beam needs to be turned off, a control signal is applied to the control circuit, causing it to short-circuit the high beam module, thus turning off the high beam. Due to the simple structure of this control circuit, it cannot achieve independent switching control of the high beam and low beam, especially the inability to independently turn on the high beam, making the headlight switching control inflexible.

[0003] Therefore, in order to address the aforementioned technical problems, it is necessary to provide a lighting switching control circuit. Utility Model Content

[0004] The purpose of this invention is to provide a lighting switching control circuit that can achieve separate switching control of high beams and low beams, especially the ability to turn on the high beams independently.

[0005] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0006] A lighting switching control circuit is used to control a first lighting unit and a second lighting unit. A first terminal of the first lighting unit is connected to a power supply voltage, and a second terminal of the first lighting unit is connected to a first terminal of the second lighting unit. A second terminal of the second lighting unit is connected to a reference potential. The lighting switching control circuit includes:

[0007] A first control unit is configured to generate a first control signal based on a first control voltage;

[0008] The first switching unit is connected between the power supply voltage and the bias voltage, and is connected to the second terminal of the first control unit and the first lighting unit. It is used to control its own on / off state based on the first control signal and the bias voltage to control the first lighting unit to turn on or off.

[0009] The second control unit is used to generate a second control signal based on the second control voltage;

[0010] The second switching unit is connected between the bias voltage and the first terminal of the second lighting unit, and is connected to the second control unit. It is used to control its own on / off state based on the second control signal and the bias voltage to control the second lighting unit to turn on or off.

[0011] The first control voltage and / or the second control voltage are energized to energize the bias voltage.

[0012] In one or more embodiments of this utility model, the lighting switching control circuit further includes a power-on control unit, which includes a first diode and a second diode. The anode of the first diode receives a first control voltage, and the anode of the second diode receives a second control voltage. The cathodes of the first diode and the second diode are connected to generate a bias voltage.

[0013] In one or more embodiments of the present invention, the first control unit includes a first transistor and a first filtering unit. The first filtering unit is used to filter the first control voltage. The first terminal of the first transistor is connected to a reference potential, the second terminal is connected to a first switching unit and generates a first control signal, and the control terminal is connected to the first filtering unit and receives the first control voltage.

[0014] In one or more embodiments of the present invention, the first switching unit includes a first switching module and a second switching module;

[0015] The first switch module is connected to the first control unit and is used to generate a first switch signal based on a first control signal and a bias voltage. The second switch module is connected in parallel with the first lighting unit and is also connected to the first switch module. It is used to control its own on-state to short-circuit the first lighting unit based on the first switch signal, and / or control its own off-state to turn on the first lighting unit.

[0016] In one or more embodiments of this utility model, the first switching module includes a second transistor, the control terminal of the second transistor receives a first control signal and a bias voltage, the first terminal is connected to a reference potential, and the second terminal is connected to the second switching module and generates a first switching signal; and / or,

[0017] The second switching module includes a third transistor. The control terminal of the third transistor receives a first switching signal, the first terminal is connected to the power supply voltage, and the second terminal is connected to the second terminal of the first lighting unit, the first terminal of the second lighting unit, and the second switching unit.

[0018] In one or more embodiments of this utility model, the first switching module further includes a second filtering unit, the second filtering unit including a third resistor, a fourth resistor, and a second capacitor. The first terminal of the third resistor receives a bias voltage, and its second terminal is connected to the first terminal of the fourth resistor and the control terminal of a second diode. The second terminal of the fourth resistor and the second terminal of the second capacitor are connected to a reference potential. The first terminal of the second capacitor is connected to the control terminal of the second diode; and / or,

[0019] The second switching module further includes a third filtering unit, which includes a fifth resistor, a sixth resistor, and a third capacitor. The first end of the fifth resistor is connected to the first switching module and receives a first switching signal. The second end is connected to the first end of the sixth resistor, the first end of the third capacitor, and the control terminal of the third transistor. The second end of the sixth resistor and the second end of the third capacitor are connected to the power supply voltage.

[0020] In one or more embodiments of the present invention, the second control unit includes a fourth transistor and a fourth filtering unit. The fourth filtering unit is used to filter the second control voltage. The first terminal of the fourth transistor is connected to a reference potential, the second terminal is connected to a second switching unit and generates a second control signal, and the control terminal is connected to the fourth filtering unit and receives the second control voltage.

[0021] In one or more embodiments of the present invention, the second switching unit includes a fifth transistor and a fifth filtering unit, wherein the fifth filtering unit is used to filter the bias voltage;

[0022] The first terminal of the fifth transistor is connected to a reference potential, the second terminal is connected to the first terminal of the second lighting unit and the second switching unit, and the control terminal is connected to the fifth filtering unit and receives the bias voltage.

[0023] In one or more embodiments of the present invention, the second switching unit further includes a voltage regulator unit, which includes a seventh capacitor and a second Zener diode. The first terminal of the seventh capacitor is connected to the second terminal of the fifth transistor and the first terminal of the second lighting unit, and the second terminal is connected to the control terminal of the fifth transistor. The anode of the second Zener diode is connected to a reference potential, and the cathode is connected to the control terminal of the fifth transistor.

[0024] In one or more embodiments of this utility model, the lighting switching control circuit further includes an eighth capacitor, the first terminal of which is connected to the power supply voltage and the second terminal of which is connected to a reference potential; and / or,

[0025] The lighting switching control circuit further includes a ninth capacitor, the first terminal of which is connected to the power supply voltage, and the second terminal of which is connected to a reference potential; and / or,

[0026] The lighting switching control circuit further includes at least one anti-backflow device, which is connected between the first control voltage and the first control unit, and / or between the second control voltage and the second control unit, and / or between the bias voltage and the first switching unit, and / or between the bias voltage and the second switching unit.

[0027] Compared with the prior art, the lighting switching control circuit of this utility model generates a bias voltage based on the first control voltage and the second control voltage, so as to realize flexible and independent switching control of high beam and low beam, especially realizing the lighting requirement of turning on the high beam alone. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a system block diagram of the lighting switching control circuit in this utility model;

[0030] Figure 2 This is a circuit diagram of the lighting switching control circuit in this utility model. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0032] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0033] The terms "coupled," "connected," or "linked" in this specification include both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as an electrical conduction medium, which may have parasitic inductance or capacitance. Indirect connections may also include connections made through other active or passive devices to achieve the same or similar functional purpose, such as connections through switches, follower circuits, or other circuits or components. Furthermore, in this invention, terms such as "first" and "second" are primarily used to distinguish one technical feature from another, and do not necessarily require or imply any actual relationship, quantity, or order between these technical features.

[0034] In the detailed description of this specification, reference is made to the accompanying drawings, which form a part thereof, wherein like reference numerals always denote like parts, and wherein exemplary embodiments are shown by way of example that may be implemented. It should be understood that other embodiments may be utilized, and structural or logical changes may be made, without departing from the scope of this application. Therefore, the following detailed description should not be considered limiting.

[0035] The various operations in the specification may be described sequentially as multiple discrete actions or operations in a manner most conducive to understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in a different order than in the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.

[0036] For the purposes of this application, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of this application, the phrase "A, B and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0037] Various components and devices may be referred to or shown in the singular (e.g., “MOS transistor”, “transistor”, “switch”, etc.) in this document, but this is only for the convenience of discussion, and any element referred to in the singular may include multiple such elements as taught herein.

[0038] The description uses the phrases "in this embodiment," "in other embodiments," or "in some embodiments," each of which may refer to one or more of the same or different embodiments. Furthermore, the terms "comprising," "including," "having," etc., used in relation to embodiments of this application are synonymous.

[0039] like Figure 1 and Figure 2 As shown, this utility model discloses a lighting switching control circuit for controlling a first lighting unit L1 and a second lighting unit L2. The first terminal of the first lighting unit L1 is connected to a power supply voltage L_LED+, and its second terminal is connected to the first terminal of the second lighting unit L2. The second terminal of the second lighting unit L2 is connected to a reference potential GND. The first lighting unit L1 includes one or more LEDs (LED1) connected in series, and the second lighting unit L2 includes one or more LEDs (LED2) connected in series. The lighting switching control circuit includes:

[0040] The first control unit 10 is used to generate a first control signal S1 based on a first control voltage LB_IN;

[0041] The first switching unit 20 is connected between the power supply voltage L_LED+ and the bias voltage VIN, and is connected to the second terminal of the first control unit 10 and the first lighting unit L1. It is used to control its own on / off state based on the first control signal S1 and the bias voltage VIN to control the first lighting unit L1 to turn on or off.

[0042] The second control unit 30 is used to generate a second control signal S2 based on the second control voltage HB_IN;

[0043] The second switching unit 40 is connected between the bias voltage VIN and the first terminal of the second lighting unit L2, and is connected to the second control unit 30. It is used to control its own on / off state based on the second control signal S2 and the bias voltage VIN to control the second lighting unit L2 to turn on or off.

[0044] The first control voltage LB_IN and / or the second control voltage HB_IN are energized to energize the bias voltage VIN.

[0045] The lighting switching control circuit also includes at least one anti-reverse current device, which is connected between the first control voltage LB_IN and the first control unit 10, and / or between the second control voltage HB_IN and the second control unit 30, and / or between the bias voltage and the first switching unit 20, and / or between the bias voltage VIN and the second switching unit 40.

[0046] like Figure 2 As shown, the lighting switching control circuit also includes a power-on control unit 50. The power-on control unit 50 includes a first diode D1 and a second diode D2. The anode of the first diode D1 receives a first control voltage LB_IN, and the anode of the second diode D2 receives a second control voltage HB_IN. The cathodes of the first diode D1 and the second diode D2 are connected to generate a bias voltage VIN. When either or both of the first control voltage LB_IN and the second control voltage HB_IN are powered on, the bias voltage VIN is powered on.

[0047] The first control unit 10 includes a first transistor Q1, a first filter unit 11, and a first anti-reverse current device. The first filter unit 11 is used to filter the first control voltage LB_IN. The first terminal of the first transistor Q1 is connected to the reference potential GND, and the second terminal is connected to the first switching unit 20 and generates a first control signal S1. The control terminal is connected to the first filter unit 11 and receives the filtered first control voltage LB_IN.

[0048] In one embodiment, the first anti-reverse current device includes a third diode D3, and the first filter unit 11 includes a first resistor R1, a second resistor R2, and a first capacitor C1. The anode of the third diode D3 receives a first control voltage LB_IN, and the cathode is connected to the first terminal of the first resistor R1. The second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2, the first terminal of the first capacitor C1, and the control terminal of the first transistor Q1. The second terminals of the second resistor R2 and the second terminal of the first capacitor C1 are connected to a reference potential GND. Exemplarily, the reference potential GND is ground voltage GND.

[0049] like Figure 2 As shown, the first switching unit 20 includes a first switching module 21 and a second switching module 22. The first switching module 21 is connected to the first control unit 10 and is used to generate a first switching signal based on the first control signal S1 and the bias voltage VIN. The second switching module 22 is connected in parallel with the first lighting unit L1 and is connected to the first switching module 21. It is used to control its own opening based on the first switching signal to short-circuit the first lighting unit L1, and / or control its own closing to open the first lighting unit L1.

[0050] Furthermore, in one embodiment, the first switching module 21 includes a second transistor Q2, a second filtering unit, and a second anti-reverse current device. The second filtering unit is used to filter the bias voltage VIN. The control terminal of the second transistor Q2 receives a first control signal S1 and the filtered bias voltage VIN. The first terminal is connected to the reference potential GND, and the second terminal is connected to the second switching module 22 to generate a first switching signal.

[0051] For example, the second filter unit includes a third resistor R3, a fourth resistor R4, and a second capacitor C2. The second anti-reverse current device includes a fourth diode D4. The anode of the third diode D3 receives the bias voltage VIN, and the cathode is connected to the first terminal of the third resistor R3. The second terminal of the third resistor R3 is connected to the first terminal of the fourth resistor R4 and the control terminal of the second diode D2. The second terminal of the fourth resistor R4 and the second terminal of the second capacitor C2 are connected to the reference potential GND. The first terminal of the second capacitor C2 is connected to the control terminal of the second diode D2.

[0052] The second switching module 22 includes a third transistor Q3, a third filtering unit, and a second voltage regulating unit. The control terminal of the third transistor Q3 receives a first switching signal, the first terminal is connected to the power supply voltage L_LED+, and the second terminal is connected to the second terminal of the first lighting unit L1, the first terminal of the second lighting unit L2, and the second switching unit 40.

[0053] For example, the third filter unit includes a fifth resistor R5, a sixth resistor R6 and a third capacitor C3. The first end of the fifth resistor R5 is connected to the first switch module 21 and receives the first switch signal. The second end is connected to the first end of the sixth resistor R6, the first end of the third capacitor C3 and the control terminal of the third transistor Q3. The second end of the sixth resistor R6 and the second end of the third capacitor C3 are connected to the power supply voltage L_LED+.

[0054] For example, the second voltage regulator unit includes a first Zener diode Z1 and a fourth capacitor C4. The anode of the first Zener diode Z1 is connected to the control terminal of the third transistor Q3, and the cathode is connected to the power supply voltage L_LED+. The first terminal of the fourth capacitor C4 is connected to the control terminal of the third transistor Q3, and the second terminal is connected to the reference potential. The second voltage regulator unit is used to stabilize the voltage through charging and discharging to prevent overcurrent from being generated due to excessively fast power-on, which could damage the transistor or other devices.

[0055] like Figure 2 As shown, the second control unit 30 includes a fourth transistor Q4, a fourth filter unit, and a third anti-reverse current device. The fourth filter unit is used to filter the second control voltage HB_IN. The first terminal of the fourth transistor Q4 is connected to the reference potential GND, and the second terminal is connected to the second switching unit 40 to generate the second control signal S2. The control terminal is connected to the fourth filter unit and receives the filtered second control voltage HB_IN.

[0056] For example, the fourth filter unit includes a seventh resistor R7, an eighth resistor R8, and a fifth capacitor C5. The third anti-reverse current device includes a fifth diode. The anode of the fifth diode receives the second control voltage HB_IN, and the cathode is connected to the first terminal of the seventh resistor R7. The second terminal of the seventh resistor R7 is connected to the first terminal of the eighth resistor R8, the first terminal of the fifth capacitor C5, and the control terminal of the fourth transistor Q4. The second terminals of the eighth resistor R8 and the fifth capacitor C5 are connected to the reference potential GND.

[0057] like Figure 2 As shown, the second switching unit 40 includes a fifth transistor Q5, a fifth filter unit, and a fourth anti-reverse current device. The fifth filter unit is used to filter the bias voltage VIN. The first terminal of the fifth transistor Q5 is connected to the reference potential GND, the second terminal is connected to the first terminal of the second lighting unit L2 and the second switching unit 40, and the control terminal is connected to the fifth filter unit and receives the filtered bias voltage VIN.

[0058] For example, the fifth filter unit includes a ninth resistor R9, a tenth resistor R10, and a sixth capacitor C6, and the fourth anti-reverse current device includes a sixth diode D6. The anode of the sixth diode D6 receives the bias voltage VIN, and the cathode is connected to the first terminal of the ninth resistor R9. The second terminal of the ninth resistor R9 is connected to the first terminal of the tenth resistor R10, the first terminal of the sixth capacitor C6, and the control terminal of the fifth transistor Q5. The second terminals of the tenth resistor R10 and the second terminal of the sixth capacitor C6 are connected to a reference potential.

[0059] The second switching unit 40 also includes a voltage regulator unit, which comprises a seventh capacitor C7 and a second Zener diode Z2. The first terminal of the seventh capacitor C7 is connected to the second terminal of the fifth transistor Q5 and the first terminal of the second illumination unit L2, and the second terminal is connected to the control terminal of the fifth transistor Q5. The anode of the second Zener diode Z2 is connected to the reference potential GND, and the cathode is connected to the control terminal of the fifth transistor Q5. The voltage regulator unit is used to stabilize the voltage through charging and discharging, preventing overcurrent from occurring due to excessively rapid power-on and potentially damaging the transistor or other devices.

[0060] This embodiment uses an anti-reverse current device to prevent current backflow and prevent the lighting unit from dimly lighting up.

[0061] The lighting switching control circuit also includes an eighth capacitor C8. The first terminal of the eighth capacitor C8 is connected to the power supply voltage L_LED+, and the second terminal is connected to the reference potential GND. The eighth capacitor C8 is used to stabilize the voltage through charging and discharging, preventing overcurrent from occurring due to rapid power-up and potential damage to transistors or other devices.

[0062] The lighting switching control circuit also includes a ninth capacitor C9. The first terminal of the ninth capacitor C9 is connected to the power supply voltage L_LED+, and the second terminal is connected to the reference potential GND. The ninth capacitor C9 is used to stabilize the voltage through charging and discharging, preventing overcurrent from occurring due to rapid power-up and potential damage to transistors or other devices.

[0063] For example, the first transistor Q1, the second transistor Q2, and the fourth transistor Q4 are all N-channel bipolar transistors, with the first terminal of the first transistor Q1 being the source, the second terminal being the drain, and the control terminal being the gate. The fifth transistor Q5 is an N-channel MOSFET, with the first terminal of the second transistor Q2 being the source, the second terminal being the drain, and the control terminal being the gate. The third transistor Q3 is a P-channel MOSFET, with the first terminal of the third transistor Q3 being the source, the second terminal being the drain, and the control terminal being the gate.

[0064] In this embodiment, the first lighting unit L1 is a low beam headlight and the second lighting unit L2 is a high beam headlight, which is used as an example for illustration:

[0065] In the first state, the first control voltage LB_IN is powered on, the second control voltage HB_IN is powered off, and the bias voltage VIN is powered on. At this time, the first transistor Q1 is turned on and generates a low-level first control signal S1. The control terminal of the second transistor Q2 is strongly pulled down by the first control signal S1, and the second transistor Q2 is turned off. The control terminal voltage of the third transistor Q3 is pulled up by the power supply voltage L_LED+, and the third transistor Q3 is turned off, and the low beam headlights are turned on. At this time, the fourth transistor Q4 is turned off, the fifth transistor Q5 is turned on and short-circuits the high beam headlights, and the high beam headlights are turned off.

[0066] In the second state, the second control voltage HB_IN is powered on, the first control voltage LB_IN is powered off, and the bias voltage VIN is powered on. At this time, the first transistor Q1 is turned off, the control terminal of the second transistor Q2 is pulled up by the bias voltage VIN, the second transistor Q2 is turned on and pulls down the control terminal voltage of the third transistor Q3, the third transistor Q3 is turned on and short-circuits the low beam headlight, turning off the low beam headlight. At this time, the fourth transistor Q4 is turned on, the control terminal voltage of the fifth transistor Q5 is strongly pulled down by the fourth transistor Q4, the fifth transistor Q5 is turned off, and the high beam headlight is turned on.

[0067] In the third state, the first control voltage LB_IN is powered on, the second control voltage HB_IN is powered on, and the bias voltage VIN is powered on. At this time, the first transistor Q1 turns on and generates a low-level first control signal S1. The control terminal of the second transistor Q2 is strongly pulled down by the first control signal S1, and the second transistor Q2 turns off. The control terminal voltage of the third transistor Q3 is pulled up by the power supply voltage L_LED+, and the third transistor Q3 turns off, turning on the low beam headlights. At this time, the fourth transistor Q4 turns on, and the control terminal voltage of the fifth transistor Q5 is strongly pulled down by the fourth transistor Q4, turning off the fifth transistor Q5, turning on the high beam headlights.

[0068] As can be seen from the above technical solutions, this utility model has the following beneficial effects:

[0069] The lighting switching control circuit of this utility model generates a bias voltage VIN based on the first control voltage LB_IN and the second control voltage HB_IN, so as to realize flexible and independent switching control of high beam and low beam, especially realizing the lighting requirement of turning on the high beam alone.

[0070] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0071] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lighting switching control circuit for controlling a first lighting unit and a second lighting unit, wherein a first terminal of the first lighting unit is connected to a power supply voltage, a second terminal of the first lighting unit is connected to a first terminal of the second lighting unit, and a second terminal of the second lighting unit is connected to a reference potential, characterized in that... The lighting switching control circuit includes: A first control unit is configured to generate a first control signal based on a first control voltage; The first switching unit is connected between the power supply voltage and the bias voltage, and is connected to the second terminal of the first control unit and the first lighting unit. It is used to control its own on / off state based on the first control signal and the bias voltage to control the first lighting unit to turn on or off. The second control unit is used to generate a second control signal based on the second control voltage; The second switching unit is connected between the bias voltage and the first terminal of the second lighting unit, and is connected to the second control unit. It is used to control its own on / off state based on the second control signal and the bias voltage to control the second lighting unit to turn on or off. The first control voltage and / or the second control voltage are energized to energize the bias voltage.

2. The lighting switching control circuit according to claim 1, characterized in that, The lighting switching control circuit also includes a power-on control unit, which includes a first diode and a second diode. The anode of the first diode receives a first control voltage, and the anode of the second diode receives a second control voltage. The cathodes of the first diode and the second diode are connected to generate a bias voltage.

3. The lighting switching control circuit according to claim 1, characterized in that, The first control unit includes a first transistor and a first filter unit. The first filter unit is used to filter the first control voltage. The first terminal of the first transistor is connected to a reference potential, the second terminal is connected to a first switching unit and generates a first control signal, and the control terminal is connected to the first filter unit and receives the first control voltage.

4. The lighting switching control circuit according to claim 1, characterized in that, The first switching unit includes a first switching module and a second switching module; The first switching module is connected to the first control unit and is used to generate a first switching signal based on a first control signal and a bias voltage; The second switch module is connected in parallel with the first lighting unit and is connected to the first switch module. It is used to control its own on-state based on the first switch signal to short-circuit the first lighting unit, and / or control its own off-state to turn on the first lighting unit.

5. The lighting switching control circuit according to claim 4, characterized in that, The first switching module includes a second transistor. The control terminal of the second transistor receives a first control signal and a bias voltage. The first terminal is connected to a reference potential, and the second terminal is connected to the second switching module and generates a first switching signal. And / or, The second switching module includes a third transistor. The control terminal of the third transistor receives a first switching signal, the first terminal is connected to the power supply voltage, and the second terminal is connected to the second terminal of the first lighting unit, the first terminal of the second lighting unit, and the second switching unit.

6. The lighting switching control circuit according to claim 5, characterized in that, The first switching module further includes a second filtering unit, which includes a third resistor, a fourth resistor, and a second capacitor. The first terminal of the third resistor receives a bias voltage, and its second terminal is connected to the first terminal of the fourth resistor and the control terminal of a second diode. The second terminal of the fourth resistor and the second terminal of the second capacitor are connected to a reference potential. The first terminal of the second capacitor is connected to the control terminal of the second diode; and / or, The second switching module further includes a third filtering unit, which includes a fifth resistor, a sixth resistor, and a third capacitor. The first end of the fifth resistor is connected to the first switching module and receives a first switching signal. The second end is connected to the first end of the sixth resistor, the first end of the third capacitor, and the control terminal of the third transistor. The second end of the sixth resistor and the second end of the third capacitor are connected to the power supply voltage.

7. The lighting switching control circuit according to claim 1, characterized in that, The second control unit includes a fourth transistor and a fourth filter unit. The fourth filter unit is used to filter the second control voltage. The first terminal of the fourth transistor is connected to a reference potential, the second terminal is connected to a second switching unit and generates a second control signal, and the control terminal is connected to the fourth filter unit and receives the second control voltage.

8. The lighting switching control circuit according to claim 1, characterized in that, The second switching unit includes a fifth transistor and a fifth filtering unit, wherein the fifth filtering unit is used to filter the bias voltage; The first terminal of the fifth transistor is connected to a reference potential, the second terminal is connected to the first terminal of the second lighting unit and the second switching unit, and the control terminal is connected to the fifth filtering unit and receives the bias voltage.

9. The lighting switching control circuit according to claim 8, characterized in that, The second switching unit further includes a voltage regulator unit, which includes a seventh capacitor and a second Zener diode. The first terminal of the seventh capacitor is connected to the second terminal of the fifth transistor and the first terminal of the second lighting unit, and the second terminal is connected to the control terminal of the fifth transistor. The anode of the second Zener diode is connected to a reference potential, and the cathode is connected to the control terminal of the fifth transistor.

10. The lighting switching control circuit according to claim 1, characterized in that, The lighting switching control circuit further includes an eighth capacitor, the first terminal of which is connected to the power supply voltage, and the second terminal of which is connected to a reference potential; and / or, The lighting switching control circuit further includes a ninth capacitor, the first terminal of which is connected to the power supply voltage, and the second terminal of which is connected to a reference potential; and / or, The lighting switching control circuit further includes at least one anti-backflow device, which is connected between the first control voltage and the first control unit, and / or between the second control voltage and the second control unit, and / or between the bias voltage and the first switching unit, and / or between the bias voltage and the second switching unit.

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