LED power supply with low standby power consumption

Abstract

The utility model discloses an LED power supply with low standby power consumption. The LED power supply comprises a rectifier bridge, a PFC circuit, a power supply main circuit, a single-chip microcomputer circuit, a feedback regulation circuit, a control circuit and a dimming signal processing circuit. The rectifier bridge, the PFC circuit and the power supply main circuit are sequentially connected between an external power supply and a load; the single-chip microcomputer circuit is connected among the feedback adjusting circuit, the dimming signal processing circuit and the output end of the power supply main circuit. The dimming signal processing circuit is connected to a dimming system; the control circuit is connected between the PFC circuit and the feedback regulation circuit; the single-chip microcomputer circuit can cut off an access between a connection point of the PFC circuit and the rectifier bridge and a grounding end and an access between a connection point of the PFC circuit and the power supply main circuit and the grounding end through the feedback regulation circuit and the control circuit when receiving a standby signal. By means of the structure, low standby power consumption can be achieved in the standby state, and good practicability is achieved.

Description

Technical Field

[0001] The utility model relates to the field of LED power supply circuits and controller circuits, in particular to an LED power supply with low standby power consumption. Background Art

[0002] With the vigorous development of LED power supply lighting industry, LED driver power supply is installed in every household and outdoor lighting, which also makes the LED power supply market develop rapidly. At the same time, customers have higher and higher performance requirements for LED power supply. At present, in practical applications, the standby power consumption of many power supplies is relatively high, which will cause unnecessary waste of electricity. For example, in conventional power supplies, general power supplies have no standby power consumption or high no-load power consumption, which will generate about 3W of no-load power consumption. At this time, in order to meet the standard of achieving low power consumption, low standby power consumption is introduced in LED power supply. At this time, the standby power consumption is less than 0.5W. For large-area project installations, low standby power consumption is particularly important at this time, which can save a lot of electricity costs; therefore, for power supplies, it is very necessary to achieve low standby power consumption. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides an LED power supply with low standby power consumption.

[0004] An embodiment of the utility model solves the technical problem by adopting a technical solution: a low standby power LED power supply, including a rectifier bridge, a PFC circuit, a power main circuit, a single-chip circuit, a feedback regulation circuit, a control circuit and a dimming signal processing circuit;

[0005] The rectifier bridge, PFC circuit and power supply main circuit are connected in sequence between the external power supply and the load;

[0006] The single chip microcomputer circuit is connected between the feedback regulation circuit, the dimming signal processing circuit and the output end of the power supply main circuit;

[0007] The dimming signal processing circuit is connected to the dimming system;

[0008] The control circuit is connected between the PFC circuit and the feedback regulation circuit;

[0009] When receiving a standby signal, the single chip microcomputer circuit can cut off the path between the connection point between the PFC circuit and the rectifier bridge and the ground terminal and the path between the connection point between the PFC circuit and the power supply main circuit and the ground terminal through the feedback regulation circuit and the control circuit.

[0010] As one of the preferred embodiments of the utility model, the PFC circuit includes a power chip U1, an inductor T3, a resistor R3, a resistor R9, a diode D1 and a MOS tube Q1. The 9th pin of the power chip U1 is connected to the power supply VDD, the 7th pin of the power chip U1 is connected to the gate of the MOS tube Q1 via the resistor R3, the source of the MOS tube Q1 is respectively connected to the 6th pin of the power chip U1, the control circuit and the GND end via the resistor R9, the drain of the MOS tube Q1 is respectively connected to the anode of the diode D1 and one end of the N1 winding of the inductor T3, the other end of the N1 winding of the inductor T3 is connected to the rectifier bridge, and the cathode of the diode D1 is respectively connected to the power main circuit and the control circuit.

[0011] As one of the preferred embodiments of the utility model, a low standby power LED power supply also includes a resistor R5 having one end connected to one end of the N2 winding of the inductor T3 and the other end connected to the 5th pin of the power chip U1, and the other end of the N2 winding of the inductor T3 is connected to the GND end.

[0012] As one of the preferred embodiments of the utility model, a low standby power consumption LED power supply also includes a resistor R7 and a capacitor C1, one end of the resistor R7 is respectively connected to the source of the MOS tube Q1 and one end of the resistor R9, the other end of the resistor R7 is respectively connected to the 4th pin of the power chip U1 and one end of the capacitor C1, and the other end of the capacitor C1 is connected to the control circuit.

[0013] As one of the preferred embodiments of the utility model, a low standby power LED power supply also includes a resistor R14, a capacitor C2 and a capacitor C3, one end of the resistor R14 is respectively connected to the second pin of the power chip U1 and one end of the capacitor C2, and the other end of the resistor R14 is respectively connected to the other end of the capacitor C2 and the GND end via the capacitor C3.

[0014] As one of the preferred embodiments of the utility model, the feedback regulation circuit includes an optocoupler U3, a resistor R13, a resistor R15, a resistor R16 and a MOS tube Q3, one end of the light emitter of the optocoupler U3 is connected to the single-chip circuit via the resistor R16, the other end of the light emitter of the optocoupler U3 is connected to the SGND end, one end of the light receiver of the optocoupler U3 is connected to the GND end, the other end of the light receiver of the optocoupler U3 is respectively connected to one end of the resistor R13 and the gate of the MOS tube Q3 via the resistor R15, the other end of the resistor R13 is respectively connected to the VCC end and the source of the MOS tube Q3, and the drain of the MOS tube Q3 is connected to the VDD end.

[0015] As one of the preferred embodiments of the utility model, the control circuit includes resistors R1-2, resistors R4, resistors R6, resistors R8, resistors R10-12, resistors R18-19, capacitors C5-6, MOS tubes Q2 and MOS tubes Q5. One end of the resistor R1 is respectively connected to the PFC circuit and the main power circuit, the other end of the resistor R1 is connected to the drain of the MOS tube Q2 via the resistor R4, the gate of the MOS tube Q2 is respectively connected to one end of the resistor R6 and one end of the resistor R10, the other end of the resistor R6 is connected to the VDD end, the other end of the resistor R10 is respectively connected to the PFC circuit, one end of the capacitor C5 and one end of the resistor R11, and the resistors R11 are connected to the PFC circuit. The other end of the resistor R11 is respectively connected to the other end of the capacitor C5, the source of the MOS tube Q2 and the PFC circuit; one end of the resistor R2 is respectively connected to the rectifier bridge and the PFC circuit, the other end of the resistor R2 is connected to the drain of the MOS tube Q5 via the resistor R8, the gate of the MOS tube Q5 is respectively connected to one end of the resistor R18 and the other end of the resistor R19, the other end of the resistor R18 is connected to the VDD terminal, the other end of the resistor R19 is respectively connected to the PFC circuit, one end of the resistor R12, one end of the capacitor C6 and the GND terminal, the other end of the resistor R12 is respectively connected to the other end of the capacitor C6, the source of the MOS tube Q5 and the PFC circuit.

[0016] The beneficial effects of the utility model are as follows: a LED power supply with low standby power consumption comprises a rectifier bridge, a PFC circuit, a power main circuit, a single-chip microcomputer circuit, a feedback regulation circuit, a control circuit and a dimming signal processing circuit; the rectifier bridge, the PFC circuit and the power main circuit are sequentially connected between an external power supply and a load; the single-chip microcomputer circuit is connected between the feedback regulation circuit, the dimming signal processing circuit and the output end of the power main circuit; the dimming signal processing circuit is connected to the dimming system; the control circuit is connected between the PFC circuit and the feedback regulation circuit; the single-chip microcomputer circuit can cut off the path between the connection point between the PFC circuit and the rectifier bridge and the ground terminal and the path between the connection point between the PFC circuit and the power main circuit and the ground terminal through the feedback regulation circuit and the control circuit when receiving a standby signal; the above structure can achieve low standby power consumption when entering the standby state, and has very good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a principle block diagram of a LED power supply with low standby power consumption;

[0019] Figure 2 The present invention is a circuit schematic diagram of an LED power supply with low standby power consumption. DETAILED DESCRIPTION

[0020] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0021] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0022] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0024] Reference Figure 1 to Figure 2 , a low standby power LED power supply, comprising a rectifier bridge 10, a PFC circuit 20, a power main circuit 30, a single chip circuit 40, a feedback regulation circuit 50, a control circuit 60 and a dimming signal processing circuit 70;

[0025] The rectifier bridge 10, the PFC circuit 20 and the power main circuit 30 are connected in sequence between the external power supply and the load;

[0026] The single chip circuit 40 is connected between the feedback regulation circuit 50, the dimming signal processing circuit 70 and the output end of the power supply main circuit 30;

[0027] The dimming signal processing circuit 70 is connected to the dimming system;

[0028] The control circuit 60 is connected between the PFC circuit 20 and the feedback regulation circuit 50;

[0029] When receiving a standby signal, the single chip microcomputer circuit 40 can cut off the path between the connection point between the PFC circuit 20 and the rectifier bridge 10 and the ground terminal and the path between the connection point between the PFC circuit 20 and the power supply main circuit 30 and the ground terminal through the feedback regulation circuit 50 and the control circuit 60.

[0030] The working principle of the utility model is as follows:

[0031] ① When the system is powered, the city power L and N will enter the PFC circuit 20 through the rectifier bridge 10. Specifically, the PFC circuit 20 includes a power chip U1, an inductor T3, a resistor R3, a resistor R9, a diode D1 and a MOS tube Q1. The 9th pin of the power chip U1 is connected to the power supply VDD, the 7th pin of the power chip U1 is connected to the gate of the MOS tube Q1 through the resistor R3, the source of the MOS tube Q1 is connected to the 6th pin of the power chip U1, the control circuit 60 and the GND terminal through the resistor R9, and the drain of the MOS tube Q1 is connected to the anode of the diode D1. The cathode of the diode D1 is connected to the N1 winding of the inductor T3 and one end of the N1 winding of the inductor T3, and the other end of the N1 winding of the inductor T3 is connected to the rectifier bridge 10, and the cathode of the diode D1 is connected to the power supply main circuit 30 and the control circuit 60 respectively; after coming out of the rectifier bridge 10, it enters the N1 winding of the inductor T3 and passes through the diode D1 to the electrolytic capacitor EC1 for filtering to generate a high-voltage signal HV. At this time, the HV high-voltage signal HV flows into the power supply main circuit 30. After the power supply main circuit 30 is running, a voltage signal VCC, a primary ground GND, and an output signal V+, a voltage signal VP and a secondary ground SGND are generated;

[0032] ② When the power supply is working normally, the VP voltage signal will supply power to the first pin of the control chip U2 in the single-chip circuit 40. At this time, the second pin of the control chip U2 sends a high level signal (effective level) through the resistor R16 and the light emitter of the optocoupler U3 to the ground SGND, thereby turning on the light receiver of the optocoupler U3. Then, the voltage signal VCC is turned on to the ground GND through the resistor R13, the resistor R15 and the light receiver of the optocoupler U3, so that the MOS tube Q3 is turned on to generate the voltage signal VDD;

[0033] ③At this time, the voltage signal VDD supplies power to the 8th pin of the power chip U1 in the PFC circuit 20, thereby ensuring the normal operation of the PFC circuit 20. At the same time, the voltage signal VDD passes through the resistors R18 and R19 to turn on the MOS tube Q5, so that the voltage signal HD passes through the resistors R2, R8, MOS tube Q5, R12 and capacitor C6 to the ground GND, and a voltage signal is generated at both ends of the resistor R12. The voltage signal is filtered by the capacitor C6 and is given to the 3rd pin of the power chip U1 for detecting the input voltage; in addition, when the voltage signal VDD supplies power to the power chip U1, the 7th pin of the power chip U1 will generate a square wave signal through the resistor R3 to the gate of the MOS tube Q1, thereby turning on the MOS tube Q1 to realize power supply. The inductor T3 is chopped. At the same time, the voltage signal VDD passes through the resistors R6 and R10 to turn on the MOS tube Q2. At this time, the HV voltage signal passes through the resistors R1, R4, MOS tube Q2, R11 and capacitor C5 to turn on the ground GND, realizing the boost of the PFC circuit. When the MOS tube Q1 is turned on, a voltage signal OC is generated at both ends of the resistor R9. The voltage signal OC flows into the 4th pin of the power chip U1 after being filtered by the resistor R7 and the capacitor C1, which is used for power detection. At the same time, the N2 winding of the inductor T3 also generates a voltage signal that flows into the 5th pin of the power chip U1 through the resistor R5 to detect whether it is zero-crossing. In addition, the resistor R14, the capacitor C3 and the capacitor C2 are placed on the 2nd pin of the power chip U1 for compensation.

[0034] ④ When the power supply needs to enter the standby state, the control dimming system generates a standby command to enter the dimming signal processing circuit 70. After being processed by the dimming signal processing circuit 70, an instruction will be sent to the single-chip circuit 40. At this time, the single-chip circuit 40 will make the second pin of the control chip U2 generate a low-level signal (invalid level) after analysis and processing, so that the optocoupler U3 cannot be turned on through the resistor R16. When the optocoupler U3 cannot be turned on, the voltage signal VCC cannot pass through the resistor R13, the resistor R15 and the optocoupler U3 to turn on the MOS tube Q3. At this time, the voltage signal VDD is an invalid signal; when VDD is invalid When the effective signal is on, the VDD signal cannot pass through the resistor R18 and the resistor R19 to turn on the MOS tube Q5. At this time, the high-voltage signal HD cannot form a loop to the ground GND through the resistor R2, the resistor R8, the MOS tube Q5, the resistor R12 and the capacitor C6. At this time, the loop is blocked and no loss will be generated. In addition, the VDD signal cannot pass through the resistor R6 and the resistor R10 to turn on the MOS tube Q2. The high-voltage signal HV cannot form a loop to the ground GND through the resistor R1, the resistor R4, the MOS tube Q2, the resistor R11 and the capacitor C5. At this time, no loop is formed and no loss will be generated, thereby achieving the effect of low power consumption in standby mode.

[0035] Preferably, a low standby power LED power supply further includes a resistor R5 having one end connected to one end of the N2 winding of the inductor T3 and the other end connected to the 5th pin of the power chip U1, and the other end of the N2 winding of the inductor T3 is connected to the GND end.

[0036] Preferably, a low standby power LED power supply also includes a resistor R7 and a capacitor C1, one end of the resistor R7 is respectively connected to the source of the MOS tube Q1 and one end of the resistor R9, the other end of the resistor R7 is respectively connected to the 4th pin of the power chip U1 and one end of the capacitor C1, and the other end of the capacitor C1 is connected to the control circuit 60.

[0037] Preferably, a low standby power LED power supply also includes a resistor R14, a capacitor C2 and a capacitor C3, one end of the resistor R14 is respectively connected to the second pin of the power chip U1 and one end of the capacitor C2, and the other end of the resistor R14 is respectively connected to the other end of the capacitor C2 and the GND end via the capacitor C3.

[0038] As a preferred embodiment of the feedback regulation circuit 50, the feedback regulation circuit 50 includes an optocoupler U3, a resistor R13, a resistor R15, a resistor R16 and a MOS tube Q3. One end of the light emitter of the optocoupler U3 is connected to the single-chip computer circuit 40 via the resistor R16, the other end of the light emitter of the optocoupler U3 is connected to the SGND end, one end of the light receiver of the optocoupler U3 is connected to the GND end, the other end of the light receiver of the optocoupler U3 is respectively connected to one end of the resistor R13 and the gate of the MOS tube Q3 via the resistor R15, the other end of the resistor R13 is respectively connected to the VCC end and the source of the MOS tube Q3, and the drain of the MOS tube Q3 is connected to the VDD end.

[0039] As a preferred embodiment of the control circuit 60, the control circuit 60 includes resistors R1-2, resistors R4, resistors R6, resistors R8, resistors R10-12, resistors R18-19, capacitors C5-6, MOS transistors Q2 and MOS transistors Q5. One end of the resistor R1 is connected to the PFC circuit 20 and the power main circuit 30 respectively, the other end of the resistor R1 is connected to the drain of the MOS transistor Q2 via the resistor R4, the gate of the MOS transistor Q2 is connected to one end of the resistor R6 and one end of the resistor R10 respectively, the other end of the resistor R6 is connected to the VDD end, the other end of the resistor R10 is connected to the PFC circuit 20, one end of the capacitor C5 and one end of the resistor R11 respectively, and the resistors The other end of R11 is respectively connected to the other end of the capacitor C5, the source of the MOS tube Q2 and the PFC circuit 20; one end of the resistor R2 is respectively connected to the rectifier bridge 10 and the PFC circuit 20, the other end of the resistor R2 is connected to the drain of the MOS tube Q5 via the resistor R8, the gate of the MOS tube Q5 is respectively connected to one end of the resistor R18 and the other end of the resistor R19, the other end of the resistor R18 is connected to the VDD terminal, the other end of the resistor R19 is respectively connected to the PFC circuit 20, one end of the resistor R12, one end of the capacitor C6 and the GND terminal, the other end of the resistor R12 is respectively connected to the other end of the capacitor C6, the source of the MOS tube Q5 and the PFC circuit 20.

[0040] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A low standby power LED power supply, characterized in that: It comprises a rectifier bridge (10), a PFC circuit (20), a power supply main circuit (30), a single chip computer circuit (40), a feedback regulation circuit (50), a control circuit (60) and a dimming signal processing circuit (70); The rectifier bridge (10), the PFC circuit (20) and the power supply main circuit (30) are connected in sequence between an external power supply and a load; The single chip circuit (40) is connected between the feedback regulation circuit (50), the dimming signal processing circuit (70) and the output end of the power supply main circuit (30); The dimming signal processing circuit (70) is connected to the dimming system; The control circuit (60) is connected between the PFC circuit (20) and the feedback regulation circuit (50); When receiving a standby signal, the single-chip circuit (40) can cut off the path between the connection point between the PFC circuit (20) and the rectifier bridge (10) and the ground terminal, and the path between the connection point between the PFC circuit (20) and the power supply main circuit (30) and the ground terminal through the feedback regulation circuit (50) and the control circuit (60).

2. The LED power supply with low standby power consumption according to claim 1, characterized in that: The PFC circuit (20) comprises a power chip U1, an inductor T3, a resistor R3, a resistor R9, a diode D1 and a MOS tube Q1. The 9th pin of the power chip U1 is connected to a power source VDD, the 7th pin of the power chip U1 is connected to the gate of the MOS tube Q1 via the resistor R3, the source of the MOS tube Q1 is respectively connected to the 6th pin of the power chip U1, the control circuit (60) and a GND terminal via the resistor R9, the drain of the MOS tube Q1 is respectively connected to the anode of the diode D1 and one end of the N1 winding of the inductor T3, the other end of the N1 winding of the inductor T3 is connected to the rectifier bridge (10), and the cathode of the diode D1 is respectively connected to the power main circuit (30) and the control circuit (60).

3. The LED power supply with low standby power consumption according to claim 2, characterized in that: It also includes a resistor R5 with one end connected to one end of the N2 winding of the inductor T3 and the other end connected to the 5th pin of the power chip U1. The other end of the N2 winding of the inductor T3 is connected to the GND end.

4. The LED power supply with low standby power consumption according to claim 2, characterized in that: It also includes a resistor R7 and a capacitor C1, one end of the resistor R7 is respectively connected to the source of the MOS tube Q1 and one end of the resistor R9, the other end of the resistor R7 is respectively connected to the fourth pin of the power chip U1 and one end of the capacitor C1, and the other end of the capacitor C1 is connected to the control circuit (60).

5. The LED power supply with low standby power consumption according to claim 2, characterized in that: It also includes a resistor R14, a capacitor C2 and a capacitor C3, one end of the resistor R14 is respectively connected to the second pin of the power chip U1 and one end of the capacitor C2, and the other end of the resistor R14 is respectively connected to the other end of the capacitor C2 and the GND end through the capacitor C3.

6. The LED power supply with low standby power consumption according to claim 1, characterized in that: The feedback regulation circuit (50) comprises an optical coupler U3, a resistor R13, a resistor R15, a resistor R16 and a MOS tube Q3; one end of the light emitter of the optical coupler U3 is connected to the single-chip circuit (40) via the resistor R16; the other end of the light emitter of the optical coupler U3 is connected to the SGND end; one end of the light receiver of the optical coupler U3 is connected to the GND end; the other end of the light receiver of the optical coupler U3 is respectively connected to one end of the resistor R13 and the gate of the MOS tube Q3 via the resistor R15; the other end of the resistor R13 is respectively connected to the VCC end and the source of the MOS tube Q3; and the drain of the MOS tube Q3 is connected to the VDD end.

7. The LED power supply with low standby power consumption according to claim 1, characterized in that: The control circuit (60) comprises resistors R1-2, resistors R4, resistors R6, resistors R8, resistors R10-12, resistors R18-19, capacitors C5-6, MOS transistors Q2 and MOS transistors Q5, one end of the resistor R1 is respectively connected to the PFC circuit (20) and the power supply main circuit (30), the other end of the resistor R1 is connected to the drain of the MOS transistor Q2 via the resistor R4, the gate of the MOS transistor Q2 is respectively connected to one end of the resistor R6 and one end of the resistor R10, the other end of the resistor R6 is connected to the VDD terminal, the other end of the resistor R10 is respectively connected to the PFC circuit (20), one end of the capacitor C5 and one end of the resistor R11, the other end of the resistor R11 is respectively connected to The other end of the capacitor C5, the source of the MOS tube Q2 and the PFC circuit (20) are connected; one end of the resistor R2 is respectively connected to the rectifier bridge (10) and the PFC circuit (20); the other end of the resistor R2 is connected to the drain of the MOS tube Q5 via the resistor R8; the gate of the MOS tube Q5 is respectively connected to one end of a resistor R18 and the other end of a resistor R19; the other end of the resistor R18 is connected to the VDD terminal; the other end of the resistor R19 is respectively connected to the PFC circuit (20), one end of the resistor R12, one end of the capacitor C6 and the GND terminal; the other end of the resistor R12 is respectively connected to the other end of the capacitor C6, the source of the MOS tube Q5 and the PFC circuit (20).

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