MOS chopping dimming circuit

By using the dual MOS transistor structure of the MOS chopper dimming circuit and the design of the chopper controller U3, the problems of low energy utilization and poor control accuracy of thyristor chopper dimming are solved, achieving more efficient energy utilization and precise control.

CN223626041UActive Publication Date: 2025-12-02MCWONG LIGHTING SHANGHAI CO LTD
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Patent Information

Application Number
CN202422965073.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-03
Publication Date
2025-12-02
Estimated Expiration
2034-12-03

AI Technical Summary

Technical Problem

Existing silicon controlled rectifier (SCR) chopper dimming suffers from low energy utilization and poor control precision.

Method used

A MOS chopper dimming circuit is adopted, which uses a dual MOS transistor structure to cut off the full-cycle waveform of the AC input, and converts the PWM signal into a 0-4.5V voltage waveform through the chopper controller U3 and the operational amplifier U2. Combined with transistors Q1 and Q6, overcurrent protection and external shutdown control are realized.

Benefits of technology

It improves energy utilization, enhances control precision, reduces turn-on losses, and minimizes heat generation in power devices, resulting in energy savings.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses an MOS chopping dimming circuit, which comprises a JP1 port, a power supply unit, an operational amplifier unit, a chopping controller U3 and a double-MOS tube structure. The JP1 port is connected with a PWM signal; the power supply unit is connected with the JP1 port; the operational amplifier unit is used for converting the PWM signal into a 0-4.5 V waveform; pins of the chopping controller U3 are respectively connected with a resistor R21, a resistor R20, a resistor R22, a resistor R13, a base electrode of a triode Q2, a capacitor EC4, an emitting electrode of the triode Q2 and a resistor R12; the resistor R12 is connected with the null line N; the resistor R13 is connected with a resistor R14 and a diode D1; the resistor R14 is connected with the triode Q2; the diode D1 is connected with a null line N; the capacitor EC4 is grounded; and the double-MOS tube structure comprises an MOS tube Q3 and an MOS tube Q4. The grid electrode of the Q3 is connected with the resistor R20, the capacitor C10 and the grid electrode of the Q4; the source electrode of the Q3 is connected with a capacitor C10 and is grounded; the drain electrode of the Q3 is connected with a resistor R22 and a live wire L; the drain electrode of the Q4 is connected with a resistor R21, a load LOAD interface and an OUT port; and the source electrode of the Q4 is grounded. The energy utilization rate can be increased, and the control precision is improved.
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Description

Technical Field

[0001] This utility model relates to the field of circuit structure technology, specifically to a MOS chopper dimming circuit. Background Technology

[0002] With the rise of smart lighting, dimming of lamps is becoming increasingly widespread in the market. Chopper dimming, which does not require additional control wiring, has gained market acceptance and typically uses silicon controlled rectifier (SCR) chopper dimming. However, SCR chopper dimming currently suffers from low energy efficiency and poor control precision. Therefore, developing a novel chopper dimming circuit to overcome these shortcomings of existing technology is a direction that those skilled in the art need to research. Utility Model Content

[0003] The purpose of this invention is to provide a MOS chopper dimming circuit that can increase energy utilization and improve control accuracy.

[0004] This utility model provides a MOS chopper dimming circuit, which includes:

[0005] The JP1 port is used to connect external devices and receive PWM signals.

[0006] A power supply unit, which is connected to the JP1 port and is used to supply power to the external device through the JP1 port;

[0007] An operational amplifier unit, connected to the JP1 port, is configured to convert the PWM signal into a voltage waveform of 0-4.5V.

[0008] A chopper controller U3 is configured to connect to the operational amplifier unit and receive the 0-4.5V voltage waveform. The chopper controller U3 uses an FL5160 chip. Its pin 8 is connected to one end of resistor R21, its pin 9 to one end of resistor R20, its pin 10 to one end of resistor R22, its pin 7 to one end of resistor R13 and the base of transistor Q2, its pin 6 to the positive terminal of capacitor EC4 and the emitter of transistor Q2, and its pin 1 to one end of resistor R12. The other end of resistor R12 is connected to the AC input neutral line N. The other end of resistor R13 is connected to one end of resistor R14 and the negative terminal of diode D1. The other end of resistor R14 is connected to the collector of transistor Q2. The positive terminal of diode D1 is connected to the AC input neutral line N. The negative terminal of capacitor EC4 is grounded.

[0009] A dual MOSFET structure is provided, comprising a first N-type MOSFET Q3 and a second N-type MOSFET Q4. The gate of the first N-type MOSFET Q3 is connected to the other end of resistor R20, one end of capacitor C10, and the gate of the second N-type MOSFET Q4. The source of the first N-type MOSFET Q3 is connected to the other end of capacitor C10 and grounded. The drain of the first N-type MOSFET Q3 is connected to the other end of resistor R22 and the AC input live wire L. The drain of the second N-type MOSFET Q4 is connected to the other end of resistor R21, the load LOAD interface, and the OUT port. The source of the second N-type MOSFET Q4 is grounded.

[0010] This technical solution employs a dual-MOSFET structure where two N-type MOSFETs respectively cut off the full-cycle waveform of the AC input. Therefore, energy utilization is improved compared to existing technologies. The chopper controller U3 uses the FL5160, which can control the conduction timing of Q1 and Q2 according to the DIM input pin level, exhibiting high accuracy. Resistors R22 and R21 are used to implement overcurrent detection, enabling the circuit to have overcurrent protection.

[0011] Preferably, the power supply unit includes:

[0012] Load power supply U5 uses a UA78M33CD voltage regulator. Pin 1 is connected to the +12V power supply, pin 2 is connected to the JP1 port and grounded, and pin 3 is connected to one end of capacitor C2, one end of capacitor C3, the 3.3V output port, and one end of inductor FB1. The other end of inductor FB1 is connected to the positive terminal of capacitor EC5, one end of capacitor C4, and the 3.3V output port. The negative terminal of capacitor EC5 is grounded. The other end of capacitor C2 is grounded. The other end of capacitor C3 is grounded. The other end of capacitor C4 is grounded.

[0013] This technical solution utilizes Load power supply U5 to power external devices.

[0014] Preferably, the operational amplifier unit includes:

[0015] Operational amplifier U2 has its inverting input connected to one end of resistor R6, and its non-inverting input connected to one end of resistors R8 and R9. Its output is connected to one end of resistor R7. The positive power input is connected to a 12V power supply, one end of capacitor C11, one end of resistor R10, and one end of resistor R33. The negative power input is connected to one end of capacitor C5 and one end of capacitor C6. The other end of capacitor C6 is connected to the other end of resistor R6 and one end of resistor R5. The other end of capacitor C5 is connected to the other end of resistor R5 and one end of resistor R4. The other end of resistor R4 is connected to port JP1. The other end of capacitor C11 is grounded.

[0016] Transistor Q1, the base of which is connected to the other end of resistor R7; the collector of transistor Q1 is connected to the other end of resistor R8, the other end of resistor R10, the cathode of diode D2, one end of capacitor C9, and the anode of diode D4; the emitter of transistor Q1 is connected to the negative input terminal of the operational amplifier U2, the anode of diode D2, the other end of resistor R9, and the other end of capacitor C9; the cathode of diode D4 is connected to pin 2 of chopper controller U3.

[0017] Transistor Q6 has its base connected to one end of resistor R31 and one end of resistor R32; its collector is connected to the other end of resistor R33, one end of resistor R30, and the gate of MOSFET Q5; its emitter is connected to the other end of resistor R32, the source of MOSFET Q5, the other end of resistor R30, and the other end of capacitor C9; and the other end of resistor R31 is connected to port JP1.

[0018] The drain and source of the MOSFET Q5 are connected to the two ends of the capacitor C7, respectively; one end of the capacitor C7 is connected to pin 2 of the chopper controller U3, and the other end of the capacitor C7 is connected to one end of the capacitor C8 and pin 5 of the chopper controller U3, respectively; the other end of the capacitor C8 is connected to one end of the resistor R34 and pin 3 of the chopper controller U3, respectively; the other end of the resistor R34 is connected to pin 4 of the chopper controller U3.

[0019] This technical solution utilizes transistors Q1 and operational amplifier U2 to convert the input PWM waveform into a 0-4.5V voltage waveform, which is then fed to the DIM pin of the chopper controller U3, achieving 0%-100% chopping. Transistors Q5 and Q6 are configured as external shutdown controllers to directly shut down the control output.

[0020] Preferably, it also includes: a short-circuit jumper JP2, which is connected to pin 4, pin 5 of the chopper controller U3 and one end of resistor R34, and the other end of resistor R34 is connected to pin 3 of the chopper controller U3 and the other end of capacitor C9.

[0021] By adopting this technical solution: JP2 is adjusted to back-cut dimming when the MODE pin of the chopper controller U3 is grounded, and otherwise it is adjusted to front-cut dimming.

[0022] Preferably, the operational amplifier U2 is an LM321;

[0023] The transistor Q1 is an MMBT3904; the transistor Q6 is an MMBT3904.

[0024] The first N-type MOSFET Q3 and the second N-type MOSFET Q4 are both 41N60; the resistance values ​​of resistors R4, R5 and R6 are the same, all being 100kΩ.

[0025] Compared with the prior art, the present invention has the following technical advantages:

[0026] First, this invention can increase energy utilization and improve control precision.

[0027] Secondly, this invention utilizes an OS transistor to achieve chopping, thereby increasing the output power. Simultaneously, the reduction in turn-on losses decreases the heat generated by power devices and contributes to energy conservation.

[0028] Finally, this invention is composed of common components such as MOSFETs and transistors, and has a simple structure that is easy to manufacture. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of Example 1. Detailed Implementation

[0030] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0031] Example 1, please refer to Figure 1 :

[0032] A MOS chopper dimming circuit includes: a JP1 port, a power supply unit, an operational amplifier unit, a chopper controller U3, a dual MOS transistor structure, a short-circuit jumper JP2, a transistor Q1, and a transistor Q6.

[0033] The JP1 port is used to connect external devices and receive PWM signals.

[0034] The power supply unit is connected to the JP1 port and is used to supply power to the external device through the JP1 port. The power supply unit includes a Load power supply U5, which uses a UA78M33CD voltage regulator. Its pin 1 is the input voltage pin VIN, its pin 2 is the ground pin GND, and its pin 3 is the output voltage pin VOUT. Pin 1 of the Load power supply U5 is connected to a +12V power supply, pin 2 is connected to the JP1 port and grounded, and pin 3 is connected to one end of capacitor C2, one end of capacitor C3, the 3.3V output port, and one end of inductor FB1. The other end of inductor FB1 is connected to the positive terminal of capacitor EC5, one end of capacitor C4, and the 3.3V output port; the negative terminal of capacitor EC5 is grounded; the other end of capacitor C2 is grounded; the other end of capacitor C3 is grounded; and the other end of capacitor C4 is grounded.

[0035] The operational amplifier unit is connected to the JP1 port and is used to convert the PWM signal into a voltage waveform of 0-4.5V. The operational amplifier unit includes:

[0036] Operational amplifier U2 has its inverting input connected to one end of resistor R6, and its non-inverting input connected to one end of resistors R8 and R9. Its output is connected to one end of resistor R7. The positive power input is connected to a 12V power supply, one end of capacitor C11, one end of resistor R10, and one end of resistor R33. The negative power input is connected to one end of capacitor C5 and one end of capacitor C6. The other end of capacitor C6 is connected to the other end of resistor R6 and one end of resistor R5. The other end of capacitor C5 is connected to the other end of resistor R5 and one end of resistor R4. The other end of resistor R4 is connected to port JP1. The other end of capacitor C11 is grounded.

[0037] The base of transistor Q1 is connected to the other end of resistor R7; the collector of transistor Q1 is connected to the other end of resistor R8, the other end of resistor R10, the cathode of diode D2, one end of capacitor C9, and the anode of diode D4; the emitter of transistor Q1 is connected to the negative input terminal of the power supply of operational amplifier U2, the anode of diode D2, the other end of resistor R9, and the other end of capacitor C9; the cathode of diode D4 is connected to pin 2 of chopper controller U3.

[0038] The base of transistor Q6 is connected to one end of resistor R31 and one end of resistor R32; the collector of transistor Q6 is connected to the other end of resistor R33, one end of resistor R30, and the gate of MOSFET Q5; the emitter of transistor Q6 is connected to the other end of resistor R32, the source of MOSFET Q5, the other end of resistor R30, and the other end of capacitor C9; the other end of resistor R31 is connected to port JP1.

[0039] The drain and source of the MOSFET Q5 are connected to the two ends of the capacitor C7, respectively; one end of the capacitor C7 is connected to pin 2 of the chopper controller U3, and the other end of the capacitor C7 is connected to one end of the capacitor C8 and pin 5 of the chopper controller U3, respectively; the other end of the capacitor C8 is connected to one end of the resistor R34 and pin 3 of the chopper controller U3, respectively; the other end of the resistor R34 is connected to pin 4 of the chopper controller U3.

[0040] The chopper controller U3 is configured to connect to the operational amplifier unit and receive the 0-4.5V voltage waveform; the chopper controller U3 uses an FL5160. Pin 8 of the chopper controller U3 is connected to one end of resistor R21, pin 9 to one end of resistor R20, pin 10 to one end of resistor R22, pin 7 to one end of resistor R13 and the base of transistor Q2, pin 6 to the positive terminal of capacitor EC4 and the emitter of transistor Q2, and pin 1 to one end of resistor R12; the other end of resistor R12 is connected to the AC input neutral line N; the other end of resistor R13 is connected to one end of resistor R14 and the negative terminal of diode D1; the other end of resistor R14 is connected to the collector of transistor Q2; the positive terminal of diode D1 is connected to the AC input neutral line N; and the negative terminal of capacitor EC4 is grounded.

[0041] The dual MOS transistor structure includes a first N-type MOS transistor Q3 and a second N-type MOS transistor Q4. The gate of the first N-type MOS transistor Q3 is connected to the other end of the resistor R20, one end of the capacitor C10, and the gate of the second N-type MOS transistor Q4. The source of the first N-type MOS transistor Q3 is connected to the other end of the capacitor C10 and grounded. The drain of the first N-type MOS transistor Q3 is connected to the other end of the resistor R22 and the AC input live wire L. The drain of the second N-type MOS transistor Q4 is connected to the other end of the resistor R21, the load LOAD interface, and the OUT port. The source of the second N-type MOS transistor Q4 is grounded.

[0042] The short-circuit jumper JP2 is connected to pins 4 and 5 of the chopper controller U3 and one end of resistor R34, respectively. The other end of resistor R34 is connected to pin 3 of the chopper controller U3 and the other end of capacitor C9.

[0043] In this example: the operational amplifier U2 is an LM321; the transistor Q1 is an MMBT3904; the transistor Q6 is an MMBT3904; the first N-type MOSFET Q3 and the second N-type MOSFET Q4 are both 41N60; the resistors R4, R5, and R6 have the same resistance value of 100kΩ.

[0044] In the above scheme:

[0045] The input PWM waveform is converted into a 0-4.5V voltage waveform by transistor Q1 and operational amplifier U2, which is then fed to the DIM pin of chopper controller U3. In conjunction with the two N-type MOSFETs in the dual MOSFET structure, the full-cycle AC input waveform is cut off, achieving 0%-100% chopping. Therefore, energy utilization is improved compared to existing technologies. Chopper controller U3 uses FL5160, which can control the conduction sequence of Q1 and Q2 according to the DIM input pin level, exhibiting high precision. Transistors Q5 and Q6 are set as external shutdown controls to achieve direct shutdown of the control output. Resistors R22 and R21 are used for overcurrent detection, providing overcurrent protection. Compared to existing technologies, this solution improves energy utilization by 30%. It also features current detection, PWM conversion, and external power supply functions. The high-power MOSFETs increase output power. Simultaneously, reduced turn-on losses decrease heat generation in power devices, contributing to energy savings.

[0046] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings. However, this utility model is not limited to the above embodiments. Even if various changes are made to this utility model, if these changes fall within the scope of the claims of this utility model and their equivalents, they shall still fall within the protection scope of this utility model.

Claims

1. A MOS chopper dimming circuit, characterized in that, include: The JP1 port is used to connect external devices and receive PWM signals. A power supply unit, which is connected to the JP1 port and is used to supply power to the external device through the JP1 port; An operational amplifier unit, connected to the JP1 port, is configured to convert the PWM signal into a voltage waveform of 0-4.5V. A chopper controller U3 is configured to connect to the operational amplifier unit and receive the 0-4.5V voltage waveform. The chopper controller U3 uses an FL5160 chip. Its pin 8 is connected to one end of resistor R21, its pin 9 to one end of resistor R20, its pin 10 to one end of resistor R22, its pin 7 to one end of resistor R13 and the base of transistor Q2, its pin 6 to the positive terminal of capacitor EC4 and the emitter of transistor Q2, and its pin 1 to one end of resistor R12. The other end of resistor R12 is connected to the AC input neutral line N. The other end of resistor R13 is connected to one end of resistor R14 and the negative terminal of diode D1. The other end of resistor R14 is connected to the collector of transistor Q2. The positive terminal of diode D1 is connected to the AC input neutral line N. The negative terminal of capacitor EC4 is grounded. A dual MOSFET structure is provided, comprising a first N-type MOSFET Q3 and a second N-type MOSFET Q4. The gate of the first N-type MOSFET Q3 is connected to the other end of resistor R20, one end of capacitor C10, and the gate of the second N-type MOSFET Q4. The source of the first N-type MOSFET Q3 is connected to the other end of capacitor C10 and grounded. The drain of the first N-type MOSFET Q3 is connected to the other end of resistor R22 and the AC input live wire L. The drain of the second N-type MOSFET Q4 is connected to the other end of resistor R21, the load LOAD interface, and the OUT port. The source of the second N-type MOSFET Q4 is grounded.

2. The MOS chopper dimming circuit according to claim 1, characterized in that, The power supply unit includes: Load power supply U5 uses a UA78M33CD voltage regulator. Pin 1 is connected to the +12V power supply, pin 2 is connected to the JP1 port and grounded, and pin 3 is connected to one end of capacitor C2, one end of capacitor C3, the 3.3V output port, and inductor FB1. The other end of inductor FB1 is connected to the positive terminal of capacitor EC5, one end of capacitor C4, and the 3.3V output port. The negative terminal of capacitor EC5 is grounded; the negative terminal of capacitor C2 is grounded; the negative terminal of capacitor C3 is grounded; and the negative terminal of capacitor C4 is grounded.

3. The MOS chopper dimming circuit according to claim 2, characterized in that, The operational amplifier unit includes: Operational amplifier U2 has its inverting input connected to one end of resistor R6, and its non-inverting input connected to one end of resistors R8 and R9. Its output is connected to one end of resistor R7. The positive power input is connected to a 12V power supply, one end of capacitor C11, one end of resistor R10, and one end of resistor R33. The negative power input is connected to one end of capacitor C5 and one end of capacitor C6. The other end of capacitor C6 is connected to the other end of resistor R6 and one end of resistor R5. The other end of capacitor C5 is connected to the other end of resistor R5 and one end of resistor R4. The other end of resistor R4 is connected to port JP1. The other end of capacitor C11 is grounded. Transistor Q1, the base of transistor Q1 is connected to the other end of resistor R7; the collector of transistor Q1 is connected to the other end of resistor R8, the other end of resistor R10, the cathode of diode D2, one end of capacitor C9, and the anode of diode D4; the emitter of transistor Q1 is connected to the negative input terminal of the power supply of operational amplifier U2, the anode of diode D2, the other end of resistor R9, and the other end of capacitor C9; the cathode of diode D4 is connected to pin 2 of chopper controller U3; Transistor Q6 has its base connected to one end of resistor R31 and one end of resistor R32; its collector is connected to the other end of resistor R33, one end of resistor R30, and the gate of MOSFET Q5; its emitter is connected to the other end of resistor R32, the source of MOSFET Q5, the other end of resistor R30, and the other end of capacitor C9; and the other end of resistor R31 is connected to port JP1. The drain and source of the MOSFET Q5 are connected to the two ends of the capacitor C7, respectively; one end of the capacitor C7 is connected to pin 2 of the chopper controller U3, and the other end of the capacitor C7 is connected to one end of the capacitor C8 and pin 5 of the chopper controller U3, respectively; the other end of the capacitor C8 is connected to one end of the resistor R34 and pin 3 of the chopper controller U3, respectively; the other end of the resistor R34 is connected to pin 4 of the chopper controller U3.

4. The MOS chopper dimming circuit according to claim 3, characterized in that, Also includes: The short-circuit jumper JP2 is connected to pins 4 and 5 of the chopper controller U3 and one end of resistor R34. The other end of resistor R34 is connected to pin 3 of the chopper controller U3 and the other end of capacitor C9.

5. The MOS chopper dimming circuit according to claim 4, characterized in that, The operational amplifier U2 is an LM321; The transistor Q1 is an MMBT3904; the transistor Q6 is an MMBT3904. The first N-type MOSFET Q3 and the second N-type MOSFET Q4 are both 41N60; the resistance values ​​of resistors R4, R5 and R6 are the same, all being 100kΩ.