Low-loss rectifying circuit

Abstract

The utility model discloses a low loss rectification circuit, including MOS tube rectification unit, high beam and low beam switching unit and high beam and low beam control unit, the MOS tube rectification unit is used for outputting the low beam driving signal or high beam driving signal of car light, the input end of the high beam and low beam switching unit is connected with the output end of the MOS tube rectification unit, and the output end of the high beam and low beam switching unit is connected with the output end of the MOS tube rectification unit. The high and low beam switching unit is used for outputting a corresponding low beam control signal or a high beam control signal according to the low beam driving signal or the high beam driving signal, and the input end of the high and low beam control unit is connected with the output end of the high and low beam switching unit. And the high and low beam control unit is used for controlling the switching of high and low beams of the automobile lamp according to the low beam control signal or the high beam control signal. According to the rectifying circuit, the MOS tube is adopted to replace a common diode, and the MOS tube has extremely low on resistance in a conducting state, so that the power loss in the rectifying circuit and the heating problem caused by the power loss are greatly reduced, and the conversion efficiency of the rectifying circuit is improved.

Description

Technical Field

[0002] The utility model relates to the technical field of rectifier circuits, in particular to a low-loss rectifier circuit.

Background Art

[0004] Automobile headlamps (commonly known as "automobile headlights") are the main equipment for automobiles to drive at night. There are various specifications and models of existing automobile headlamp light sources, such as H4 and H7, including different types of bulbs such as incandescent lamps and xenon lamps. The H4 headlamp is a single-lamp high and low beam dual light source, mainly including H4 halogen lamps and H4 xenon lamps. The H4 lamp is connected to the original vehicle through a set of three-position connectors. Two lighting power supply lines and a common line respectively form a low beam and a high beam power supply circuit. The low beam and the high beam form a difference due to different reflection heights generated by different light source focal lengths.

[0005] The traditional H4 headlamp rectifier circuit is usually based on a bridge rectifier circuit of ordinary diodes, and has the disadvantage of a relatively large conduction voltage drop. At present, the power supply voltage of automobile lamps in a 12V system is usually between 11 and 13.5V, while the voltage drop of the rectifier circuit based on ordinary diodes is generally above 1.2V, and the voltage drop of the linear drive circuit itself is above 0.5V. These power losses will cause the headlamp to generate a high amount of heat, resulting in an extremely low conversion efficiency of the rectifier circuit.

Content of the Utility Model

[0007] In order to solve the technical problems of large power loss, high heat generation, and low conversion efficiency caused by the high conduction voltage drop of the current ordinary diode rectifier circuit, the utility model proposes a low-loss rectifier circuit.

[0008] The utility model is realized by the following technical solutions:

[0009] A low-loss rectifier circuit includes a MOS transistor rectification unit, a high and low beam switching unit, and a high and low beam control unit. The MOS transistor rectification unit is used to output a low beam drive signal or a high beam drive signal of the headlamp. The input end of the high and low beam switching unit is connected to the output end of the MOS transistor rectification unit. The high and low beam switching unit is used to output a corresponding low beam control signal or high beam control signal according to the low beam drive signal or the high beam drive signal. The input end of the high and low beam control unit is connected to the output end of the high and low beam switching unit. The high and low beam control unit is used to control the switching of the high and low beams of the headlamp according to the low beam control signal or the high beam control signal.

[0010] A low-loss rectifier circuit as described above, the MOS transistor rectifier unit includes a first MOS transistor rectifier circuit, a second MOS transistor rectifier circuit, and a third MOS transistor rectifier circuit. The output terminal of the first MOS transistor rectifier circuit is connected to the input terminal of the high and low beam switching unit, and the first MOS transistor rectifier circuit is used to output the low beam driving signal of the vehicle lamp; the output terminal of the second MOS transistor rectifier circuit is connected to the input terminal of the high and low beam switching unit, and the second MOS transistor rectifier circuit is used to output the first high beam driving signal of the vehicle lamp; the output terminal of the third MOS transistor rectifier circuit is connected to the input terminal of the high and low beam switching unit, and the third MOS transistor rectifier circuit is used to output the second high beam driving signal of the vehicle lamp.

[0011] A low-loss rectifier circuit as described above, the first MOS transistor rectifier circuit includes a PMOS transistor Q3, an NMOS transistor Q4, a resistor R4, a resistor R5, a resistor R11, and a resistor R12. The drain of the PMOS transistor Q3 is connected to the low beam input port L. A resistor R5 is connected between the source and the gate of the PMOS transistor Q3. A resistor R4 is connected between the gate of the PMOS transistor Q3 and the common input port COM. A resistor R12 is connected between the drain of the PMOS transistor Q3 and the gate of the NMOS transistor Q4. The drain of the NMOS transistor Q4 is connected to the common input port COM. A resistor R11 is connected between the gate and the source of the NMOS transistor Q4. The source of the NMOS transistor Q4 is grounded.

[0012] A low-loss rectifier circuit as described above, the second MOS transistor rectifier circuit includes a PMOS transistor Q3, an NMOS transistor Q4, a diode D3, a diode D4, a resistor R4, a resistor R5, a resistor R11, and a resistor R12. The anode of the diode D4 is connected to the high beam input port H. A reverse-biased diode D3 is connected between the anode of the diode D4 and the ground. The cathode of the diode D4 is connected to the source of the PMOS transistor Q3. A resistor R5 is connected between the source and the gate of the PMOS transistor Q3. A resistor R4 is connected between the gate of the PMOS transistor Q3 and the common input port COM. A resistor R12 is connected between the drain of the PMOS transistor Q3 and the gate of the NMOS transistor Q4. The drain of the NMOS transistor Q4 is connected to the common input port COM. A resistor R11 is connected between the gate and the source of the NMOS transistor Q4. The source of the NMOS transistor Q4 is grounded.

[0013] A low-loss rectifier circuit as described above, the third MOS transistor rectifier circuit includes a PMOS transistor Q3, an NMOS transistor Q4, a diode D3, a diode D4, a resistor R4, a resistor R5, a resistor R11, and a resistor R12. The positive electrode of the diode D4 is connected to the high beam input port H. A reverse-biased diode D3 is connected between the positive electrode of the diode D4 and the ground. The negative electrode of the diode D4 is connected to the source electrode of the PMOS transistor Q3. A resistor R5 is connected between the source electrode and the gate electrode of the PMOS transistor Q3. A resistor R4 is connected between the gate electrode of the PMOS transistor Q3 and the common input port COM. The drain electrode of the PMOS transistor Q3 is connected to the low beam input port L. A resistor R12 is connected between the drain electrode of the PMOS transistor Q3 and the gate electrode of the NMOS transistor Q4. The drain electrode of the NMOS transistor Q4 is connected to the common input port COM. A resistor R11 is connected between the source electrode and the gate electrode of the NMOS transistor Q4. The source electrode of the NMOS transistor Q4 is grounded.

[0014] A low-loss rectifier circuit as described above, the high and low beam switching unit is used to output a corresponding low beam control signal according to the low beam drive signal, the high and low beam switching unit is used to output a corresponding first high beam control signal according to the first high beam drive signal, and the high and low beam switching unit is used to output a corresponding second high beam control signal according to the second high beam drive signal.

[0015] A low-loss rectifier circuit as described above, the high and low beam switching unit includes a diode Dz1, a diode Dz2, a transistor Qz1, a MOS transistor Qz2, a resistor Rz1, a resistor Rz2, a resistor Rz4, a resistor Rz5, a resistor Rz6, and a resistor Rz7. The positive electrode of the diode Dz2 is connected to the output terminal of the MOS transistor rectifier unit. The common point of the negative electrodes of the diode Dz2 and the diode Dz1 is connected to the emitter of the transistor Qz1. One end of the resistor Rz7 is connected to the output terminal of the MOS transistor rectifier unit, and the other end of the resistor Rz7 is connected to the common point of the positive electrode of the diode Dz1 and the resistor Rz1. The resistor Rz1 is connected to the resistor Rz2. A resistor Rz4 is connected between the negative electrode of the diode Dz1 and the resistor Rz2. The common point of the resistor Rz2 and the resistor Rz4 is connected to the collector of the transistor Qz1. The collector of the transistor Qz1 is connected to the resistor Rz5. The resistor Rz5 is connected to the gate electrode of the MOS transistor Qz2. A resistor Rz6 is connected between the gate electrode of the MOS transistor Qz2 and the ground. The source electrode of the MOS transistor Qz2 is grounded. The drain electrode of the MOS transistor Qz2 is connected to the input terminal of the high and low beam control unit.

[0016] A low-loss rectifier circuit as described above, wherein the high-low beam control unit 300 includes a low beam control circuit and a high beam control circuit. The input end of the low beam control circuit is connected to the output end of the high-low beam switching unit. The low beam control circuit is configured to control the vehicle lamp to switch to the low beam according to the low beam control signal. The input end of the high beam control circuit is connected to the output end of the high-low beam switching unit. The high beam control circuit is configured to control the vehicle lamp to switch to the high beam according to the first high beam control signal or the second high beam control signal.

[0017] A low-loss rectifier circuit as described above, wherein the low beam control circuit includes an MOS transistor Q6, a light-emitting diode LED1, a zener diode D2, a resistor R15, and a resistor R17. The gate of the MOS transistor Q6 is connected to the output end of the high-low beam switching unit. A resistor R15 is connected between the gate of the MOS transistor Q6 and the positive electrode of the light-emitting diode LED1. The negative electrode of the light-emitting diode LED1 is connected to the drain of the MOS transistor Q6. A reversely biased zener diode D2 is connected between the gate of the MOS transistor Q6 and the ground. The source of the MOS transistor Q6 is connected to the negative electrode of the vehicle lamp.

[0018] A low-loss rectifier circuit as described above, wherein the high beam control circuit includes an MOS transistor Q7, a light-emitting diode LED2, a resistor R15, a resistor R16, and a resistor R17. A resistor R15 and a resistor R16 are connected between the gate of the MOS transistor Q7 and the output end of the high-low beam switching unit. A resistor R17 is connected between the gate of the MOS transistor Q7 and the ground. The common point of the resistor R15 and the resistor R16 is connected to the positive electrode of the light-emitting diode LED2. The negative electrode of the light-emitting diode LED2 is connected to the drain of the MOS transistor Q7. The source of the MOS transistor Q7 is connected to the negative electrode of the vehicle lamp.

[0019] Compared with the prior art, a low-loss rectifier circuit proposed by the present utility model has the following beneficial effects:

[0020] 1. The rectifier circuit of the present utility model adopts the design of using MOS transistors instead of ordinary diodes. By utilizing the extremely low on-resistance of MOS transistors in the conducting state, the power loss in the rectification circuit and the heat generation problem caused by the power loss are greatly reduced, and the conversion efficiency of the rectifier circuit is improved.

[0021] 2. The MOS transistor rectification unit of the present utility model uses PMOS transistors and NMOS transistors in cooperation for rectification. By utilizing the extremely low on-resistance of PMOS transistors and NMOS transistors, the power loss in the rectification process is greatly reduced compared with ordinary diodes, and the conversion efficiency of the rectifier circuit is improved. At the same time, PMOS transistors and NMOS transistors can conduct electricity bidirectionally. In the rectifier circuit, they can automatically adapt to the polarity change of the input signal without changing the circuit configuration, which can further improve the rectification efficiency.

Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below.

[0024] Figure 1 It is a structural block diagram of the low-loss dual-lamp rectifier circuit of the present invention;

[0025] Figure 2 It is the circuit schematic diagram of the present invention.

Detailed Embodiments

[0027] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Specific embodiments, in combination with Figures 1 to 2 As shown, the technical solution of the present invention is further described. A low-loss rectifier circuit includes a MOS tube rectification unit 100, a high-low beam switching unit 200, and a high-low beam control unit 300. The MOS tube rectification unit 100 is used to output a low beam drive signal or a high beam drive signal of the vehicle lamp. The input end of the high-low beam switching unit 200 is connected to the output end of the MOS tube rectification unit 100. The high-low beam switching unit is used to output a corresponding low beam control signal or high beam control signal according to the low beam drive signal or the high beam drive signal. The input end of the high-low beam control unit 300 is connected to the output end of the high-low beam switching unit 200. The high-low beam control unit is used to control the switching of the high and low beams of the vehicle lamp according to the low beam control signal or the high beam control signal.

[0029] Further, as a preferred embodiment rather than a limitation of this solution, the MOS tube rectification unit 100 includes a first MOS tube rectification circuit, a second MOS tube rectification circuit, and a third MOS tube rectification circuit. The output end of the first MOS tube rectification circuit is connected to the input end of the high-low beam switching unit 200. The first MOS tube rectification circuit is used to output a low beam drive signal of the vehicle lamp. The output end of the second MOS tube rectification circuit is connected to the input end of the high-low beam switching unit 200. The second MOS tube rectification circuit is used to output a first high beam drive signal of the vehicle lamp. The output end of the third MOS tube rectification circuit is connected to the input end of the high-low beam switching unit 200. The third MOS tube rectification circuit is used to output a second high beam drive signal of the vehicle lamp.

[0030] In this embodiment, the rectifier circuit uses MOS transistors instead of ordinary diodes. By taking advantage of the extremely low on-resistance of MOS transistors in the on state, the power loss in the rectifier circuit and the heat generation caused by the power loss are greatly reduced, and the conversion efficiency of the rectifier circuit is improved.

[0031] Further, as a preferred implementation manner of this solution rather than a limitation, the first MOS transistor rectifier circuit includes a PMOS transistor Q3, an NMOS transistor Q4, a resistor R4, a resistor R5, a resistor R11, and a resistor R12. The drain of the PMOS transistor Q3 is connected to the low beam input port L. A resistor R5 is connected between the source and the gate of the PMOS transistor Q3. A resistor R4 is connected between the gate of the PMOS transistor Q3 and the common input port COM. A resistor R12 is connected between the drain of the PMOS transistor Q3 and the gate of the NMOS transistor Q4. The drain of the NMOS transistor Q4 is connected to the common input port COM. A resistor R11 is connected between the gate and the source of the NMOS transistor Q4. The source of the NMOS transistor Q4 is grounded.

[0032] Further, as a preferred implementation manner of this solution rather than a limitation, the second MOS transistor rectifier circuit includes a PMOS transistor Q3, an NMOS transistor Q4, a diode D3, a diode D4, a resistor R4, a resistor R5, a resistor R11, and a resistor R12. The anode of the diode D4 is connected to the high beam input port H. A reverse-biased diode D3 is connected between the anode of the diode D4 and the ground. The cathode of the diode D4 is connected to the source of the PMOS transistor Q3. A resistor R5 is connected between the source and the gate of the PMOS transistor Q3. A resistor R4 is connected between the gate of the PMOS transistor Q3 and the common input port COM. A resistor R12 is connected between the drain of the PMOS transistor Q3 and the gate of the NMOS transistor Q4. The drain of the NMOS transistor Q4 is connected to the common input port COM. A resistor R11 is connected between the gate and the source of the NMOS transistor Q4. The source of the NMOS transistor Q4 is grounded.

[0033] Further, as a preferred implementation manner of this solution rather than a limitation, the third MOS transistor rectification circuit includes a PMOS transistor Q3, an NMOS transistor Q4, a diode D3, a diode D4, a resistor R4, a resistor R5, a resistor R11, and a resistor R12. The positive electrode of the diode D4 is connected to the high beam input port H. A reverse-biased diode D3 is connected between the positive electrode of the diode D4 and the ground. The negative electrode of the diode D4 is connected to the source electrode of the PMOS transistor Q3. A resistor R5 is connected between the source electrode and the gate electrode of the PMOS transistor Q3. A resistor R4 is connected between the gate electrode of the PMOS transistor Q3 and the common input port COM. The drain electrode of the PMOS transistor Q3 is connected to the low beam input port L. A resistor R12 is connected between the drain electrode of the PMOS transistor Q3 and the gate electrode of the NMOS transistor Q4. The drain electrode of the NMOS transistor Q4 is connected to the common input port COM. A resistor R11 is connected between the source electrode and the gate electrode of the NMOS transistor Q4. The source electrode of the NMOS transistor Q4 is grounded.

[0034] In this embodiment, the MOS transistor rectification unit uses a PMOS transistor and an NMOS transistor in cooperation for rectification. By taking advantage of the extremely low on-resistance of the PMOS transistor and the NMOS transistor, the power loss during the rectification process is greatly reduced compared with that of an ordinary diode, and the conversion efficiency of the rectification circuit is improved. At the same time, the PMOS transistor and the NMOS transistor can conduct electricity bidirectionally. In the rectification circuit, they can automatically adapt to the polarity change of the input signal without changing the circuit configuration, which can further improve the rectification efficiency.

[0035] When a positive voltage is input to the high beam input port H, a forward-biased diode D4 is connected between the high beam input port H and the source electrode of the PMOS transistor. A reverse-biased diode D3 is connected between the diode D4 and the ground. Such a design is to prevent the gate electrode of the PMOS transistor Q3 from being damaged by a too high voltage impact when an overvoltage or transient voltage appears at the high beam input port H, ensuring the stability and reliability of the circuit.

[0036] Further, as a preferred implementation manner of this solution rather than a limitation, the input ends of the high and low beam switching unit are respectively connected to the output ends of the first MOS transistor rectification circuit, the second MOS transistor rectification circuit, and the third MOS transistor rectification circuit. The high and low beam switching unit is used to output a corresponding low beam control signal according to the low beam drive signal, the high and low beam switching unit is used to output a corresponding first high beam control signal according to the first high beam drive signal, and the high and low beam switching unit is used to output a corresponding second high beam control signal according to the second high beam drive signal.

[0037] Further, as a preferred implementation manner rather than a limitation of this solution, the high-low beam switching unit includes a diode Dz1, a diode Dz2, a triode Qz1, a MOS transistor Qz2, a resistor Rz1, a resistor Rz2, a resistor Rz4, a resistor Rz5, a resistor Rz6, and a resistor Rz7. The positive electrode of the diode Dz2 is connected to the output end of the MOS rectifier unit. The common point of the negative electrode of the diode Dz2 and the negative electrode of the diode Dz1 is connected to the emitter of the triode Qz1. One end of the resistor Rz7 is connected to the output end of the MOS rectifier unit, and the other end of the resistor Rz7 is connected to the common point of the positive electrode of the diode Dz1 and the resistor Rz1. The resistor Rz1 is connected to the resistor Rz2. A resistor Rz4 is connected between the negative electrode of the diode Dz1 and the resistor Rz2. The common point of the resistor Rz2 and the resistor Rz4 is connected to the collector of the triode Qz1. The collector of the triode Qz1 is connected to the resistor Rz5. The resistor Rz5 is connected to the gate of the MOS transistor Qz2. A resistor Rz6 is connected between the gate of the MOS transistor Qz2 and the ground. The source of the MOS transistor Qz2 is grounded, and the drain of the MOS transistor Qz2 is connected to the input end of the high-low beam control unit.

[0038] In this embodiment, the high-low beam switching unit can not only switch the high-low beam output of the vehicle lamp, but also feedback corresponding control signals to the control unit to achieve different constant current outputs for high and low beams, and further achieve different power outputs for high and low beams.

[0039] Further, as a preferred implementation manner rather than a limitation of this solution, the high-low beam control unit 300 includes a low beam control circuit and a high beam control circuit. The input end of the low beam control circuit is connected to the output end of the high-low beam switching unit. The low beam control circuit is used to control the vehicle lamp to switch to low beam according to the low beam control signal. The input end of the high beam control circuit is connected to the output end of the high-low beam switching unit. The high beam control circuit is used to control the vehicle lamp to switch to high beam according to the first high beam control signal or the second high beam control signal.

[0040] Further, as a preferred implementation manner rather than a limitation of this solution, the low beam control circuit includes a MOS transistor Q6, a light-emitting diode LED1, a voltage stabilizing diode D2, a resistor R15, and a resistor R17. The gate of the MOS transistor Q6 is connected to the output end of the high-low beam switching unit. A resistor R15 is connected between the gate of the MOS transistor Q6 and the positive electrode of the light-emitting diode LED1. The negative electrode of the light-emitting diode LED1 is connected to the drain of the MOS transistor Q6. The gate of the MOS transistor Q6 is connected to the negative electrode of the voltage stabilizing diode D2. The positive electrode of the voltage stabilizing diode D2 is connected to GND. The source of the MOS transistor Q6 is connected to the negative electrode of the vehicle lamp.

[0041] Further, as a preferred implementation manner rather than a limitation of this solution, the high beam control circuit includes an MOS transistor Q7, a light-emitting diode LED2, a resistor R15, a resistor R16, and a resistor R17. A resistor R15 and a resistor R16 are connected between the gate of the MOS transistor Q7 and the output terminal of the high and low beam switching unit. A resistor R17 is connected between the gate of the MOS transistor Q7 and the ground. The common point of the resistor R15 and the resistor R16 is connected to the positive electrode of the light-emitting diode LED2. The negative electrode of the light-emitting diode LED2 is connected to the drain of the MOS transistor Q7. The source of the MOS transistor Q7 is connected to the negative electrode of the vehicle lamp.

[0042] In this embodiment, the high and low beam control unit uses an MOS transistor to control the switching between high beam and low beam. Utilizing the fast switching ability of the MOS transistor, it has a fast response ability during the switching between high beam and low beam. At the same time, the MOS transistor can control its on and off states by changing the gate voltage, thereby realizing the fast switching of the vehicle lamp's high and low beams.

[0043] Furthermore, as a preferred implementation manner rather than a limitation of this solution, the high beam control circuit further includes a zener diode D1. The positive electrode of the zener diode D1 is connected to the gate of the MOS transistor Q7, and the negative electrode of the zener diode D1 is connected to the drain of the MOS transistor Q6.

[0044] In this embodiment, a zener diode is connected between the gate of the MOS transistor Q7 and the drain of the MOS transistor Q6. In fact, it is to prevent the gate of the MOS transistor Q7 from being damaged by high voltage impact when switching between high beam and low beam.

[0045] The working principle of this embodiment is as follows:

[0046] For a low-loss rectifier circuit proposed by the present utility model, when the vehicle lamp is switched to the low beam mode, the specific principle is as follows: The low beam input port L is connected to a positive voltage, and the common input port COM is connected to a negative voltage. At this time, no loop is formed between the high beam input port H and the common input port COM. After being rectified by the first MOS rectifier circuit, a constant low beam drive signal is output. The low beam drive signal is output as a low beam control signal through the high and low beam switching unit. The low beam control signal makes a positive voltage difference form between the gate and the source of the MOS transistor Q6 through the zener diode D2, and the MOS transistor Q6 conducts. While the gate voltage of the MOS transistor Q7 is pulled low by the MOS transistor Q6 through the zener diode Q1, the MOS transistor Q7 is cut off, thereby controlling the light-emitting diode LED1 to conduct and realizing the lighting of the vehicle lamp's low beam.

[0047] When the vehicle lamp switches to the first high - beam mode, the specific principle is as follows: The high - beam input port H is connected to a positive voltage, and the common input port COM is connected to a negative voltage. After being rectified by the second MOS - tube rectification circuit, a constant first high - beam driving signal is output. The first high - beam driving signal makes the transistor Qz1 in the high - low beam switching unit conduct. At this time, a positive voltage difference is formed between the gate and the source of the MOS tube Qz2, and the MOS tube Qz2 conducts to output the first high - beam control signal. At the same time, when the MOS tube Qz2 conducts, the gate of the MOS tube Q6 is grounded, the MOS tube Q6 is cut off, the voltage - stabilizing diode D1 becomes ineffective, a positive voltage difference is formed between the gate and the source of the MOS tube Q7, the MOS tube Q7 conducts, and then controls the light - emitting diode LED2 to conduct, realizing the lighting of the high - beam lamp of the vehicle lamp.

[0048] When the vehicle lamp switches to the second high - beam mode, the specific principle is as follows: Both the high - beam input port H and the low - beam input port L are connected to positive voltages, and the common input port COM is connected to a negative voltage. After being rectified by the third MOS - tube rectification circuit, a constant second high - beam driving signal is output. The second high - beam driving signal makes the transistor Qz1 in the high - low beam switching unit conduct. At this time, a positive voltage difference is formed between the gate and the source of the MOS tube Qz2, and the MOS tube Qz2 conducts to output the second high - beam control signal. At the same time, when the MOS tube Qz2 conducts, the gate of the MOS tube Q6 is grounded, the MOS tube Q6 is cut off, the voltage - stabilizing diode D1 becomes ineffective, a positive voltage difference is formed between the gate and the source of the MOS tube Q7, the MOS tube Q7 conducts, and then controls the light - emitting diode LED2 to conduct, realizing the lighting of the high - beam lamp of the vehicle lamp.

[0049] Those of ordinary skill in the art should understand that: As described above, an implementation manner is provided in combination with specific content, and it is not considered that the specific implementation of the present utility model is only limited to these descriptions. At the same time, due to different industry names, it is not limited to the above names, nor limited to English names. Those that are similar or identical to the method, structure, etc. of the present utility model, or those that make several technical deductions or substitutions under the premise of the concept of the present utility model, should be regarded as within the protection scope of the present utility model.

Claims

1. A low-loss rectifier circuit, characterized in that, Comprising: A MOS transistor rectification unit for outputting a low beam drive signal or a high beam drive signal of a vehicle lamp; A high and low beam switching unit, the input end of which is connected to the output end of the MOS transistor rectification unit, and the high and low beam switching unit is used to output a corresponding low beam control signal or high beam control signal according to the low beam drive signal or the high beam drive signal; A high and low beam control unit, the input end of which is connected to the output end of the high and low beam switching unit, and the high and low beam control unit is used to control the switching of the high and low beams of the vehicle lamp according to the low beam control signal or the high beam control signal.

2. The low-loss rectifier circuit according to claim 1, characterized in that The MOS transistor rectification unit includes: A first MOS transistor rectification circuit, the output end of which is connected to the input end of the high and low beam switching unit, and the first MOS transistor rectification circuit is used to output a low beam drive signal of the vehicle lamp; A second MOS transistor rectification circuit, the output end of which is connected to the input end of the high and low beam switching unit, and the second MOS transistor rectification circuit is used to output a first high beam drive signal of the vehicle lamp; A third MOS transistor rectification circuit, the output end of which is connected to the input end of the high and low beam switching unit, and the third MOS transistor rectification circuit is used to output a second high beam drive signal of the vehicle lamp.

3. The low-loss rectifier circuit according to claim 2, wherein The first MOS transistor rectification circuit includes a PMOS transistor Q3, an NMOS transistor Q4, a resistor R4, a resistor R5, a resistor R11, and a resistor R12. The drain of the PMOS transistor Q3 is connected to the low beam input port L. A resistor R5 is connected between the source and the gate of the PMOS transistor Q3. A resistor R4 is connected between the gate of the PMOS transistor Q3 and the common input port COM. A resistor R12 is connected between the drain of the PMOS transistor Q3 and the gate of the NMOS transistor Q4. The drain of the NMOS transistor Q4 is connected to the common input port COM. A resistor R11 is connected between the gate and the source of the NMOS transistor Q4. The source of the NMOS transistor Q4 is grounded.

4. A low-loss rectifier circuit according to claim 2, wherein The second MOS transistor rectification circuit includes a PMOS transistor Q3, an NMOS transistor Q4, a diode D3, a diode D4, a resistor R4, a resistor R5, a resistor R11, and a resistor R12. The positive electrode of the diode D4 is connected to the high beam input port H. A reverse-biased diode D3 is connected between the positive electrode of the diode D4 and the ground. The negative electrode of the diode D4 is connected to the source of the PMOS transistor Q3. A resistor R5 is connected between the source and the gate of the PMOS transistor Q3. A resistor R4 is connected between the gate of the PMOS transistor Q3 and the common input port COM. A resistor R12 is connected between the drain of the PMOS transistor Q3 and the gate of the NMOS transistor Q4. The drain of the NMOS transistor Q4 is connected to the common input port COM. A resistor R11 is connected between the gate and the source of the NMOS transistor Q4. The source of the NMOS transistor Q4 is grounded.

5. The low-loss rectifier circuit according to claim 2, characterized in that, The third MOS transistor rectifier circuit includes a PMOS transistor Q3, an NMOS transistor Q4, a diode D3, a diode D4, a resistor R4, a resistor R5, a resistor R11, and a resistor R12. The positive electrode of the diode D4 is connected to the high beam input port H. A reverse-biased diode D3 is connected between the positive electrode of the diode D4 and the ground. The negative electrode of the diode D4 is connected to the source electrode of the PMOS transistor Q3. A resistor R5 is connected between the source electrode and the gate electrode of the PMOS transistor Q3. A resistor R4 is connected between the gate electrode of the PMOS transistor Q3 and the common input port COM. The drain electrode of the PMOS transistor Q3 is connected to the low beam input port L. A resistor R12 is connected between the drain electrode of the PMOS transistor Q3 and the gate electrode of the NMOS transistor Q4. The drain electrode of the NMOS transistor Q4 is connected to the common input port COM. A resistor R11 is connected between the source electrode and the gate electrode of the NMOS transistor Q4. The source electrode of the NMOS transistor Q4 is grounded.

6. The low-loss rectifier circuit according to claim 2, wherein The high and low beam switching unit is used to output a corresponding low beam control signal according to the low beam driving signal, the high and low beam switching unit is used to output a corresponding first high beam control signal according to the first high beam driving signal, and the high and low beam switching unit is used to output a corresponding second high beam control signal according to the second high beam driving signal.

7. A low-loss rectifier circuit according to claim 1, wherein The high and low beam switching unit includes a diode Dz1, a diode Dz2, a triode Qz1, a MOS transistor Qz2, a resistor Rz1, a resistor Rz2, a resistor Rz4, a resistor Rz5, a resistor Rz6, and a resistor Rz7. The positive electrode of the diode Dz2 is connected to the output end of the MOS transistor rectifier unit. The common point of the negative electrodes of the diode Dz2 and the diode Dz1 is connected to the emitter of the triode Qz1. One end of the resistor Rz7 is connected to the output end of the MOS transistor rectifier unit, and the other end of the resistor Rz7 is connected to the common point of the positive electrode of the diode Dz1 and the resistor Rz1. The resistor Rz1 is connected to the resistor Rz2. A resistor Rz4 is connected between the negative electrode of the diode Dz1 and the resistor Rz2. The common point of the resistor Rz2 and the resistor Rz4 is connected to the collector of the triode Qz1. The collector of the triode Qz1 is connected to the resistor Rz5. The resistor Rz5 is connected to the gate electrode of the MOS transistor Qz2. A resistor Rz6 is connected between the gate electrode of the MOS transistor Qz2 and the ground. The source electrode of the MOS transistor Qz2 is grounded. The drain electrode of the MOS transistor Qz2 is connected to the input end of the high and low beam control unit.

8. A low-loss rectifier circuit according to claim 6, characterized in that, The high and low beam control unit includes: A low beam control circuit, the input end of the low beam control circuit is connected to the output end of the high and low beam switching unit, and the low beam control circuit is used to control the vehicle lamp to switch to low beam according to the low beam control signal; A high beam control circuit, the input end of the high beam control circuit is connected to the output end of the high and low beam switching unit, and the high beam control circuit is used to control the vehicle lamp to switch to high beam according to the first high beam control signal or the second high beam control signal.

9. The low-loss rectifier circuit according to claim 8, characterized in that, The low beam control circuit includes an MOS transistor Q6, a light-emitting diode LED1, a zener diode D2, a resistor R15, and a resistor R17. The gate of the MOS transistor Q6 is connected to the output terminal of the high and low beam switching unit. A resistor R15 is connected between the gate of the MOS transistor Q6 and the positive electrode of the light-emitting diode LED1. The negative electrode of the light-emitting diode LED1 is connected to the drain of the MOS transistor Q6. A reversely biased zener diode D2 is connected between the gate of the MOS transistor Q6 and the ground. The source of the MOS transistor Q6 is connected to the negative electrode of the vehicle lamp.

10. A low-loss rectifier circuit according to claim 8, characterized in that, The high beam control circuit includes an MOS transistor Q7, a light-emitting diode LED2, a resistor R15, a resistor R16, and a resistor R17. A resistor R15 and a resistor R16 are connected between the gate of the MOS transistor Q7 and the output terminal of the high and low beam switching unit. A resistor R17 is connected between the gate of the MOS transistor Q7 and the ground. The common point of the resistor R15 and the resistor R16 is connected to the positive electrode of the light-emitting diode LED2. The negative electrode of the light-emitting diode LED2 is connected to the drain of the MOS transistor Q7. The source of the MOS transistor Q7 is connected to the negative electrode of the vehicle lamp.

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