Positive and negative dimming logic circuit of LED driving power supply
By designing the forward and reverse dimming logic circuit of the LED driver power supply, the circuit structure of the main control unit U3, MOS tube and transistor is used to realize the function of having both forward and reverse control logic at the same time, solving the problem of only single logic control in the existing technology, and meeting the needs of different customers.
Patent Information
- Application Number
- CN202420572371.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-23
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-03-23
AI Technical Summary
Existing LED driver power supplies only have a single positive logic or negative logic control, and cannot meet the positive and negative dimming logic needs of different customers at the same time.
A forward and reverse dimming logic circuit for LED driving power supply is designed, and the dimming signal is received through the main control unit U3 and the complementary PWM signal is output. Combined with the circuit structure of MOS tube and transistor, the forward and reverse logic is switched.
It realizes the control logic of both positive and negative at the same time, and controls the MOS tube conduction according to the actual situation, outputs the corresponding control logic to meet the needs of different customers.
Smart Images
Figure CN222884822U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of LED power supplies, in particular to a positive and negative dimming logic circuit of an LED driving power supply. Background Art
[0002] As technology continues to develop and mature, the application areas of LED lighting are becoming wider and wider. The use of power dimming is also becoming more and more widespread, and the application places are becoming more and more diverse. At present, there is a demand for positive dimming logic and negative dimming logic in the industry.
[0003] Currently in the industry, most dimming products have positive and negative logic dimming functions designed on two products respectively. When the client needs positive dimming logic, a positive dimming logic product is provided. When the client needs negative dimming logic, a negative dimming logic product is provided. The dimming on one product does not have two control logics at the same time.
[0004] Therefore, the power supplies currently on the market only have single positive logic control or negative logic control, and do not have two control logics at the same time, which cannot meet the needs of different customers. Utility Model Content
[0005] In order to solve the above problems, the present technical solution provides a positive and negative dimming logic circuit of an LED driving power supply.
[0006] To achieve the above purpose, the technical solution is as follows:
[0007] A positive and negative dimming logic circuit of an LED driving power supply, comprising:
[0008] A main control unit U3, which has an input terminal for receiving a dimming signal DIM, and also has a first output terminal and a second output terminal for outputting two complementary PWM signals;
[0009] MOS transistor Q102, whose drain is connected to the first output terminal, whose source is connected to resistor R107, and whose gate is connected to voltage VCC via resistor R104;
[0010] MOS tube Q103, whose drain is connected to the second output terminal, whose source is connected to the resistor R107, whose gate is connected to an external lead through a resistor R106, and the external lead is further connected to the voltage VCC through a resistor R108;
[0011] MOS tube Q104, whose drain is connected to the voltage VCC through resistor R104, whose drain is also connected to the gate of Q102, whose source is grounded, whose gate is connected to the external lead through resistor R105 and resistor R106, and whose gate is connected to the voltage VCC through resistor R105, resistor R106 and resistor R108;
[0012] The transistor Q105 has a base connected to the gate of the MOS transistor Q103 through resistors R103 and R107, a collector connected to the voltage VCC through resistor R102, and an emitter outputting a signal.
[0013] In some embodiments, a terminal P1 is further included. The terminal P1 has a dimming signal DIM. The terminal P1 is also used to conduct an output signal of the transistor Q105 .
[0014] In some embodiments, a transistor Q101 is further included, wherein the collector of the transistor Q101 is connected to the voltage VCCS, the emitter is connected to the voltage VCC through a diode D101, the base of the transistor Q101 is grounded through a diode ZD101, and the voltage VCCS is connected to the diode ZD101 through a resistor R101.
[0015] In some embodiments, the voltage VCC is connected to the VCC terminal of the main control unit U3 through a resistor R109.
[0016] In some embodiments, the dimming input terminal of the main control unit U3 receives the dimming signal DIM through the resistor R1 , and both ends of the resistor R1 are grounded through the capacitor C101 and the diode TVS1 , respectively.
[0017] In some embodiments, the model of the main control unit U3 is GP9301.
[0018] The beneficial effects of this application are:
[0019] This application has two control logics at the same time, which can turn on the corresponding MOS tube according to the actual situation, so that the main control unit U3 can output the corresponding control logic to meet the needs of different customers. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.
[0021] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;
[0022] Figure 2 It is a structural schematic diagram of the second embodiment of the present utility model. DETAILED DESCRIPTION
[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0024] Please refer to Figure 1-2 As shown, a positive and negative dimming logic circuit of an LED driving power supply includes:
[0025] A main control unit U3, which has an input terminal for receiving a dimming signal DIM, and also has a first output terminal and a second output terminal for outputting two complementary PWM signals;
[0026] MOS transistor Q102, whose drain is connected to the first output terminal, whose source is connected to resistor R107, and whose gate is connected to voltage VCC via resistor R104;
[0027] MOS tube Q103, whose drain is connected to the second output terminal, whose source is connected to the resistor R107, whose gate is connected to an external lead through a resistor R106, and the external lead is further connected to the voltage VCC through a resistor R108;
[0028] MOS tube Q104, whose drain is connected to the voltage VCC through resistor R104, whose drain is also connected to the gate of Q102, whose source is grounded, whose gate is connected to the external lead through resistor R105 and resistor R106, and whose gate is connected to the voltage VCC through resistor R105, resistor R106 and resistor R108;
[0029] The transistor Q105 has a base connected to the gate of the MOS transistor Q103 through resistors R103 and R107, a collector connected to the voltage VCC through resistor R102, and an emitter outputting a signal.
[0030] The first output terminal of the main control unit U3 outputs negative logic, and the second output terminal outputs positive logic. The external lead is wire 4 in the figure. When wire 4 is grounded, the gates of MOS tubes Q103 and Q104 are at a low level, and the voltage VCC supplies power to the gate of MOS tube Q102. Therefore, MOS tubes Q103 and 104 are not turned on, while MOS tube Q102 is turned on. Therefore, the negative logic of the main control unit U3 passes through MOS tube Q102 to transistor Q105, and is inverted by transistor Q105. Finally, the CCO output is complementary to pin 7. square wave signal; when line 4 is suspended, the gates of MOS tubes Q103 and Q104 are at high level, and the conduction of MOS tube Q104 allows the voltage VCC to flow through here without passing through the gate of MOS tube Q102. The gate of Q102 is at low level, so MOS tube Q102 is not turned on, and the positive logic of the main control unit U3 passes through MOS tube Q103 to transistor Q105, and is inverted by transistor Q105. Finally, CCO outputs a square wave signal complementary to pin 6. Therefore, this application can meet the different logic requirements of customers at the same time.
[0031] In this embodiment, a terminal P1 is further included. The terminal P1 has a dimming signal DIM. The terminal P1 is also used to conduct the output signal of the transistor Q105.
[0032] In this embodiment, a transistor Q101 is further included, the collector of the transistor Q101 is connected to the voltage VCCS, the emitter is connected to the voltage VCC through a diode D101, the base of the transistor Q101 is grounded through a diode ZD101, and the voltage VCCS is connected to the diode ZD101 through a resistor R101.
[0033] In this embodiment, the voltage VCC is connected to the VCC terminal of the main control unit U3 through the resistor R109.
[0034] In this embodiment, the dimming input terminal of the main control unit U3 receives the dimming signal DIM through the resistor R1 , and both ends of the resistor R1 are grounded through the capacitor C101 and the diode TVS1 , respectively.
[0035] In this embodiment, the model of the main control unit U3 is GP9301. After the chip GP9301 works normally, the 6PWM pin and the 7-pin PWMB will output complementary PWM signals.
[0036] Embodiment 2, refer to the attached Figure 2 At the voltage VCC, the collector of the transistor Q105 is connected through the resistor R102, the transistor Q105 is connected to the MOS transistor Q102, and the base of the transistor Q105 is connected to the MOS transistor Q103 through the resistor R103, forming an inverting circuit of the dimming output port to realize positive and negative logic dimming.
[0037] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application. Other principles and basic structures that are the same or similar to those of the present application are within the protection scope of the present application.
Claims
1. A positive and negative dimming logic circuit for an LED driving power supply, characterized in that: include; A main control unit U3, which has an input terminal for receiving a dimming signal DIM, and also has a first output terminal and a second output terminal for outputting two complementary PWM signals; MOS transistor Q102, whose drain is connected to the first output terminal, whose source is connected to resistor R107, and whose gate is connected to voltage VCC via resistor R104; MOS tube Q103, whose drain is connected to the second output terminal, whose source is connected to the resistor R107, whose gate is connected to an external lead through a resistor R106, and the external lead is further connected to the voltage VCC through a resistor R108; MOS tube Q104, whose drain is connected to the voltage VCC through resistor R104, whose drain is also connected to the gate of Q102, whose source is grounded, whose gate is connected to the external lead through resistor R105 and resistor R106, and whose gate is connected to the voltage VCC through resistor R105, resistor R106 and resistor R108; The transistor Q105 has a base connected to the gate of the MOS transistor Q103 through resistors R103 and R107, a collector connected to the voltage VCC through resistor R102, and an emitter outputting a signal.
2. The LED driving power supply forward and reverse dimming logic circuit according to claim 1, characterized in that: The device further comprises a terminal P1 , wherein the terminal P1 has a dimming signal DIM, and the terminal P1 is also used to conduct an output signal of the transistor Q105 .
3. The LED driving power supply forward and reverse dimming logic circuit according to claim 1, characterized in that: It also includes a transistor Q101, the collector of the transistor Q101 is connected to the voltage VCCS, the emitter is connected to the voltage VCC through a diode D101, the base of the transistor Q101 is grounded through a diode ZD101, and the voltage VCCS is connected to the diode ZD101 through a resistor R101.
4. The LED driving power supply forward and reverse dimming logic circuit according to claim 2, characterized in that: The voltage VCC is connected to the VCC terminal of the main control unit U3 through the resistor R109.
5. The LED driving power supply forward and reverse dimming logic circuit according to claim 4, characterized in that: The dimming input terminal of the main control unit U3 receives the dimming signal DIM through the resistor R1 , and both ends of the resistor R1 are grounded through the capacitor C101 and the diode TVS1 , respectively.
6. The LED driving power supply forward and reverse dimming logic circuit according to claim 1, characterized in that: The model of the main control unit U3 is GP9301.