LED driving power supply efficiency auxiliary circuit

Abstract

The utility model provides an LED driving power supply efficiency auxiliary circuit. The LED driving power supply efficiency auxiliary circuit comprises a transformer, a power supply input module, a control module, a starting power supply module and an auxiliary power supply module. The primary side of the transformer comprises a primary winding and a secondary winding. The power input module is connected with commercial power, converts the commercial power into direct current and supplies the direct current to the primary side of the transformer, the primary side comprises a main winding, the starting power supply module is connected with the output end of the power input module and supplies power to the control module, and the control module is used for adjusting the output voltage and current of the driving power supply product. The auxiliary power supply module is connected with a primary side secondary winding of the transformer and the starting power supply module, the primary side secondary winding is used for generating induced voltage to supply power to the auxiliary power supply module, and the auxiliary power supply module is used for supplying power to the control module and cutting off power supply of the starting power supply module to the control module. Therefore, double-circuit power supply is avoided, the loss generated by starting the power supply module is reduced, and the efficiency of a driving power supply product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of LED drive power supplies, and particularly relates to an LED drive power supply efficiency auxiliary circuit. Background Technique

[0002] With the increasing global emphasis on energy conservation, emission reduction and sustainable development, LED (light emitting diode) lighting technology has become an important alternative to traditional lighting technologies due to its high efficiency, long lifespan and environmental friendliness, and has been widely used in multiple fields such as indoor lighting, outdoor lighting, automotive lighting, and industrial lighting. The core of LED lighting technology lies in its ability to directly convert electrical energy into light energy, and the conversion efficiency is much higher than that of traditional lighting devices such as incandescent lamps and fluorescent lamps. However, to fully utilize this advantage of LED lamps, the design of an efficient and stable LED drive power supply is particularly important.

[0003] The performance of LED lamps, especially their brightness and light output intensity, is directly affected by the drive current and forward voltage drop, and these parameters will fluctuate with the change of ambient temperature. Therefore, in order to maintain the stable lighting effect of LED lamps and extend their service life, a drive power supply that can accurately control the current, adapt to temperature changes and has high-efficiency conversion is required. Traditional LED drive power supplies mostly adopt linear or switching power supply modes, but they often face problems such as low efficiency, high heat generation and high cost in high-power applications, and it is difficult to meet the requirements of modern lighting systems for high efficiency, energy conservation and reliability. Summary of the Utility Model

[0004] In order to solve the above problems, the purpose of the utility model is to provide an LED drive power supply efficiency auxiliary circuit to achieve precise control of the LED drive power supply in each stage of startup, operation and protection, so as to achieve the purpose of improving the overall system efficiency and reducing energy waste.

[0005] The utility model is realized through the following technical solutions:

[0006] An LED drive power supply efficiency auxiliary circuit includes:

[0007] A control module for adjusting the output voltage and current of the drive power supply;

[0008] A power input module for accessing the commercial power and converting the commercial power into direct current;

[0009] A transformer, the primary side of which includes a main winding and a secondary winding, the output end of the power input module is connected to the main winding of the primary side of the transformer, and the control module is connected to the main winding of the primary side of the transformer;

[0010] Start the power supply module. The start power supply module is connected to the output terminal of the power input module, and the start power supply module supplies power to the control module.

[0011] An auxiliary power supply module. The auxiliary power supply module is connected to the primary side secondary winding of the transformer and the start power supply module. The primary side secondary winding is used to generate an induced voltage to supply power to the auxiliary power supply module. The auxiliary power supply module is used to supply power to the control module and cut off the power supply of the start power supply module to the control module.

[0012] Further, the start power supply module includes a power supply component and a cut-off component. The power supply component is used to supply the direct current of the power input module to the control module. The cut-off component is respectively connected to the power supply component and the auxiliary power supply module. The cut-off component is used to cut off the power supply of the power supply component to the control module when the auxiliary power supply module outputs voltage.

[0013] Further, the power supply component includes a sixth switching tube, a first resistor component connected between the control terminal of the sixth switching tube and the output terminal of the power input module, and a second resistor component connected between one electrode terminal of the sixth switching tube and the output terminal of the power input module. The other electrode terminal of the sixth switching tube is the output terminal of the power supply component.

[0014] Further, the cut-off component includes a fifth switching tube. The control terminal of the fifth switching tube is connected in series with a forty-first resistor to the output terminal of the auxiliary power supply module. The control terminal of the fifth switching tube is grounded after being connected in series with a forty-second resistor. One electrode terminal of the fifth switching tube is connected to the control terminal of the sixth switching tube, and the other electrode terminal of the fifth switching tube is grounded. There is a twelfth diode connected between the end of the forty-first resistor far from the fifth switching tube and the other electrode terminal of the sixth switching tube. The cathode of the twelfth diode is connected to the sixth switching tube.

[0015] Further, the control terminal of the sixth switching tube is grounded after being connected in series with a fifth zener diode. The anode of the fifth zener diode is grounded. A series of an eleventh diode and a third zener diode is arranged between the control terminal of the sixth switching tube and the other electrode terminal of the sixth switching tube. The cathode of the eleventh diode is connected to the cathode of the third zener diode.

[0016] Further, the auxiliary power supply module includes a rectification component connected to the primary side secondary winding of the transformer and a fourth switching tube connected to the output terminal of the rectification component. One electrode terminal of the fourth switching tube is connected to the rectification component. There is a thirty-eighth resistor connected between one electrode terminal of the fourth switching tube and the control terminal. The other electrode terminal of the fourth switching tube is the output terminal of the auxiliary power supply module.

[0017] Further, the auxiliary power supply module further includes a filtering component, one end of the filtering component is connected to the common end of the output end of the rectifying component and one electrode end of the fourth switching tube, and the other end of the filtering component is grounded.

[0018] Further, the auxiliary power supply module further includes a first zener diode connected to the control end of the fourth switching tube, and the anode of the first zener diode is grounded.

[0019] Further, the rectifying component includes a ninth diode connected in series between the primary side secondary winding and one electrode end of the fourth switching tube, and a thirty-seventh resistor and a twentieth capacitor connected in series and then connected in parallel across both ends of the ninth diode; the cathode of the ninth diode is connected to the fourth switching tube.

[0020] Compared with the prior art, the technical solution and its beneficial effects of the present utility model are as follows:

[0021] (1) The startup power supply module of the present utility model supplies power to the control module at the initial stage of circuit startup. After the circuit starts to work, the auxiliary power supply module supplies power to the control module and cuts off the power supply of the startup power supply module to the control module, realizing precise control of the LED driving power supply in each stage such as startup, operation, and protection, thereby improving the overall efficiency of the system and reducing energy waste.

[0022] (2) After the output end of the auxiliary power supply module of the present utility model starts to supply power, the supply voltage of the auxiliary power supply module 40 drives the gate of the fifth switching tube through resistor current limiting, making the fifth switching tube conduct, thereby pulling the gate of the sixth switching tube low to ground, and the sixth switching tube is cut off. No current flows through the second resistor component and the sixth switching tube, thereby reducing power supply loss and improving circuit efficiency. Description of the Drawings

[0023] Figure 1 is the circuit schematic diagram of the LED driving power supply provided by the embodiment of the present utility model (the secondary side part of the transformer is not shown);

[0024] Figure 2 is the circuit schematic diagram of the startup power supply module provided by the embodiment of the present utility model;

[0025] Figure 3 is the circuit schematic diagram of the auxiliary power supply module provided by the embodiment of the present utility model.

[0026] Illustration:

[0027] Power input module - 10; Control module - 20; Startup power supply module - 30; Power supply component - 31; First resistor component - 311; Second resistor component - 312; Cut-off component - 32; Auxiliary power supply module - 40; Current component - 41; Filtering component - 42. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] Referring to Figure 1 , an LED drive power efficiency auxiliary circuit includes a transformer, a power input module 10, a control module 20, a startup power supply module 30, and an auxiliary power supply module 40. The primary side of the transformer includes a main winding TR1A and a secondary winding TR1B. The power input module accesses the commercial power and converts the commercial power into direct current for supply to the main winding TR1A of the primary side of the transformer. The startup power supply module 30 is connected to the output terminal of the power input module 10, and the startup power supply module 30 supplies power to the control module 20. The control module 20 is used to adjust the output voltage and current of the drive power product. The auxiliary power supply module 40 is connected to the secondary winding TR1B of the primary side of the transformer and the startup power supply module 30. The secondary winding TR1B of the primary side is used to generate an induced voltage to supply power to the auxiliary power supply module. The auxiliary power supply module 40 is used to supply power to the control module 20 and cut off the power supply of the startup power supply module 30 to the control module 20.

[0030] In the initial stage of circuit startup, the power input module accesses external power supply, and the startup power supply module 30 supplies power to the control module 20, so that the circuit starts to work. After the circuit works, the secondary winding TR1B generates an induced electromotive force to supply power to the auxiliary power supply module 40. The auxiliary power supply module 40 supplies power to the control module 20 and at the same time cuts off the power supply of the startup power supply module 30 to the control module 20. Thereby, dual-circuit power supply is avoided, the loss generated by the startup power supply module 30 is reduced, and the efficiency of the drive power product is improved.

[0031] The startup power supply module 30 includes a power supply component 31 and a cut-off component 32. The power supply component 31 is used to supply the direct current of the power input module 10 to the control module 20. The cut-off component 32 is respectively connected to the power supply component 31 and the auxiliary power supply module 40. The cut-off component 32 is used to cut off the power supply of the power supply component 31 to the control module 20 when the auxiliary power supply module 40 outputs voltage.

[0032] Referring to Figure 2, the power supply component includes a sixth switching transistor Q6. In this embodiment, the sixth switching transistor Q6 is an NMOS transistor. The gate of the sixth switching transistor Q6 is connected to the output terminal of the power input module after being serially connected with a first resistor component 311. The drain of the sixth switching transistor Q6 is connected to the output terminal of the power input module after being serially connected with a second resistor component 312. The source of the sixth switching transistor Q6 is the output terminal of the power supply component 31, that is, the source of the sixth switching transistor Q6 is the output terminal of the startup power supply module 30 and supplies power to the control module 20. After the power input module 10 outputs direct current, the direct current provides a driving voltage for the gate of the sixth switching transistor Q6 through the first resistor component. The drain and the source of the sixth switching transistor Q6 are turned on, and the source of the sixth switching transistor Q6 outputs direct current VCC1 to supply power to the control module.

[0033] The cut-off component 32 includes a fifth switching transistor Q5. In this embodiment, the fifth switching transistor Q5 is an NMOS transistor. The gate of the fifth switching transistor Q5 is serially connected with a resistor R41 and connected to the output terminal VCC of the auxiliary power supply module 40. The gate of the fifth switching transistor Q5 is serially connected with a resistor R42 and then grounded to GND. The drain of the fifth switching transistor Q5 is connected to the gate of the sixth switching transistor Q6, and the source of the fifth switching transistor Q5 is grounded. A diode D12 is connected between the end of the resistor R41 far from the fifth switching transistor Q5 and the source of the sixth switching transistor Q6, and the cathode of the diode D12 is connected to the source of the sixth switching transistor Q6. After the output terminal VCC of the auxiliary power supply module 40 starts to supply power, the supply voltage of the auxiliary power supply module 40 drives the gate of the fifth switching transistor Q5 after being limited by the resistor R41, so that the fifth switching transistor Q5 is turned on, thereby pulling down the gate of the sixth switching transistor Q6 to the ground, and the sixth switching transistor Q6 is turned off. No current flows through the second resistor component 312 and the sixth switching transistor Q6 anymore, thereby reducing the power supply loss and improving the circuit efficiency. The power supply of the output terminal VCC of the auxiliary power supply module 40 is transmitted to the cathode of the diode D12, that is, the source of the sixth switching transistor Q6, to supply power to the control module.

[0034] The gate of the sixth switching transistor Q6 is serially connected with a zener diode ZD5 and then grounded to GND, and the anode of the zener diode ZD5 is grounded. A diode D11 and a zener diode ZD3 are serially connected between the gate and the source of the sixth switching transistor Q6, and the cathodes of the diode D11 and the zener diode ZD3 are connected.

[0035] Refer to Figure 3, the auxiliary power supply module 40 includes a rectification component 41 connected to the secondary winding TR1B of the primary side of the transformer, and a fourth switching transistor Q4 connected to the output terminal of the rectification component 41. In this embodiment, the fourth switching transistor Q4 is an NPN-type triode. The collector of the fourth switching transistor Q4 is connected to the rectification component. A resistor R38 is connected between the collector and the base of the fourth switching transistor Q4. The emitter of the fourth switching transistor Q4 is the output terminal VCC of the auxiliary power supply module 40. The rectification component 41 includes a diode D9 connected in series between the secondary winding TR1B of the primary side and the collector of the fourth switching transistor Q4, and a resistor R37 and a capacitor C20 connected in parallel after being connected in series and then connected in parallel across both ends of the diode D9. An induced voltage is generated by the secondary winding TR1B of the primary side of the transformer, rectified by the diode D9 and supplied to the collector and the base of the fourth switching transistor Q4. The fourth switching transistor Q4 conducts, and a stable voltage is output from the emitter of the fourth switching transistor Q4. This stable voltage is the output voltage of the auxiliary power supply module, supplies power to the control module 20, and at the same time turns off the sixth switching transistor Q6.

[0036] The auxiliary power supply module 40 further includes a filtering component 42 for filtering the power supply rectified by the diode D9. One end of the filtering component 42 is connected to the common terminal of the output terminal of the rectification component 41 and the collector of the fourth switching transistor Q4, and the other end of the filtering component 42 is grounded. In this example, the filtering component 42 includes an electrolytic capacitor CE4 and a capacitor C23 connected in parallel. The auxiliary power supply module 40 further includes a voltage stabilizing diode ZD1 connected to the base of the fourth switching transistor Q4, and the anode of the voltage stabilizing diode ZD1 is grounded.

[0037] The above description shows and describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept of the present invention herein through the above teachings or the technology or knowledge in related fields. And the modifications and changes made by those skilled in the art that do not depart from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. An LED driving power supply efficiency auxiliary circuit, characterized in that: include: A control module, used to adjust the output voltage and current of the driving power supply; The power input module is connected to the mains power and converts the mains power into direct current; A transformer, wherein the primary side of the transformer comprises a main winding and a secondary winding, the output end of the power input module is connected to the primary side main winding of the transformer, and the control module is connected to the primary side main winding of the transformer; A starting power supply module, the starting power supply module is connected to the output end of the power input module, and the starting power supply module supplies power to the control module; An auxiliary power supply module, the auxiliary power supply module is connected to the primary side auxiliary winding of the transformer and the starting power supply module, the primary side auxiliary winding is used to generate an induced voltage to power the auxiliary power supply module, and the auxiliary power supply module is used to power the control module and cut off the power supply of the starting power supply module to the control module.

2. The LED driving power supply efficiency auxiliary circuit according to claim 1, characterized in that: The starting power supply module includes a power supply component and a cut-off component. The power supply component is used to supply direct current from the power input module to the control module. The cut-off component is respectively connected to the power supply component and the auxiliary power supply module. The cut-off component is used to cut off the power supply of the control module by the power supply component when the auxiliary power supply module outputs voltage.

3. The LED driving power supply efficiency auxiliary circuit according to claim 2, characterized in that: The power supply component includes a sixth switch tube, a first resistor component connected between the control end of the sixth switch tube and the output end of the power input module, and a second resistor component connected between one electrode end of the sixth switch tube and the output end of the power input module. The other electrode end of the sixth switch tube is the output end of the power supply component.

4. The LED driving power supply efficiency auxiliary circuit according to claim 3, characterized in that: The cut-off component includes a fifth switch tube, a control end of the fifth switch tube is connected in series with a forty-first resistor and connected to the output end of the auxiliary power supply module, a control end of the fifth switch tube is connected in series with a forty-second resistor and then grounded, an electrode end of the fifth switch tube is connected to the control end of the sixth switch tube, and the other electrode end of the fifth switch tube is grounded; A twelfth diode is connected between one end of the forty-first resistor away from the fifth switch tube and the other electrode end of the sixth switch tube, and a cathode of the twelfth diode is connected to the sixth switch tube.

5. The LED driving power supply efficiency auxiliary circuit according to any one of claims 3 or 4, characterized in that: The control end of the sixth switch tube is connected in series with a fifth voltage stabilizing diode and then grounded, and the anode of the fifth voltage stabilizing diode is grounded; An eleventh diode and a third voltage regulator diode are connected in series between the control end of the sixth switch tube and the other electrode end of the sixth switch tube, and the cathode of the eleventh diode is connected to the cathode of the third voltage regulator diode.

6. The LED driving power supply efficiency auxiliary circuit according to claim 1, characterized in that: The auxiliary power supply module includes a rectifier component connected to the primary side secondary winding of the transformer, and a fourth switch tube connected to the output end of the rectifier component. An electrode end of the fourth switch tube is connected to the rectifier component. A thirty-eighth resistor is connected between an electrode end of the fourth switch tube and a control end. The other electrode end of the fourth switch tube is the output end of the auxiliary power supply module.

7. The LED driving power supply efficiency auxiliary circuit according to claim 6, characterized in that: The auxiliary power supply module also includes a filter component, one end of which is connected to a common end of the output end of the rectifier component and an electrode end of the fourth switch tube, and the other end of the filter component is grounded.

8. The LED driving power supply efficiency auxiliary circuit according to claim 7, characterized in that: The auxiliary power supply module further includes a first voltage regulator diode connected to the control end of the fourth switch tube, and an anode of the first voltage regulator diode is grounded.

9. The LED driving power supply efficiency auxiliary circuit according to claim 6, characterized in that: The rectifier component includes a ninth diode connected in series between the primary side secondary winding and one electrode end of the fourth switch tube, and a thirty-seventh resistor and a twentieth capacitor connected in series and in parallel at both ends of the ninth diode; the cathode of the ninth diode is connected to the fourth switch tube.

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