Quick-response zero-loss power failure storage circuit and LED dimming power supply

Abstract

The utility model discloses a fast response zero loss power-down storage circuit and LED dimming power supply, power-down storage circuit includes resistor R1-4 and triode Q1-2, one end of resistor R1 accesses voltage signal V1, one end of resistor R2 accesses voltage signal V2, the other end of resistor R1 is connected with the base electrode of triode Q1, the other end of resistor R2 is connected with the emitter electrode of triode Q1, and the other end of resistor R1 is connected with the emitter electrode of triode Q1. A collector electrode of the triode Q1 is connected with a base electrode of the triode Q2 through a resistor R4, a collector electrode of the triode Q2 is connected with a VCC end through a resistor R3 and outputs a voltage signal Power rDown, the voltage signal Power Down is connected to the main control circuit, and an emitter electrode of the triode Q2 is connected with a GND end; through the structure, quick response and zero loss of power-down storage can be realized, convenience and simplification are realized, circuit connection is simple, the number of devices is small, cost is low, performance is stable, space is saved, and product miniaturization is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical fields of LED dimming drive power supplies and switching power supplies, and particularly relates to a fast-response zero-loss power-down storage circuit and an LED dimming power supply. Background Art

[0002] With the booming development of the LED power lighting industry, LED drive power supplies have been installed in every household and outdoor lighting, which has also rapidly developed the LED power supply market. At the same time, customers have higher and higher requirements for the performance of LED power supplies; the power-down storage circuit is widely used in power supplies. The existing power-down storage circuits not only have losses, but also have complex circuit structures and high costs, and at the same time have the disadvantage of slow response speed. The LED dimming power supply requires that when the power supply is powered off, the single-chip microcomputer needs to save the data and dimming signals before the power supply is powered off, and then turn off the relevant signals according to the timing. The response speed and reliability requirements for the power-down storage circuit are very high; therefore, there is an urgent need for a fast-response zero-loss power-down storage circuit and an LED dimming power supply to solve the above problems. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a fast-response zero-loss power-down storage circuit and an LED dimming power supply.

[0004] An embodiment of the utility model adopts the following technical solution to solve its technical problems: A fast-response zero-loss power-down storage circuit includes resistors R1-4 and triodes Q1-2. One end of resistor R1 is connected to voltage signal V1, one end of resistor R2 is connected to voltage signal V2, the other end of resistor R1 is connected to the base of triode Q1, the other end of resistor R2 is connected to the emitter of triode Q1, the collector of triode Q1 is connected to the base of triode Q2 through resistor R4, the collector of triode Q2 is connected to the VCC terminal through resistor R3 and outputs voltage signal Power Down, voltage signal Power Down is connected to the main control circuit, and the emitter of triode Q2 is connected to the GND terminal;

[0005] Wherein, when voltage signal V1 > voltage signal V2, voltage signal Power Down does not enable the main control circuit; when voltage signal V1 < voltage signal V2, voltage signal Power Down enables the main control circuit to execute saving the current data and the current dimming signal.

[0006] As one of the preferred embodiments of the utility model, triode Q1 is a PNP triode, and triode Q2 is an NPN triode.

[0007] An LED dimming power supply includes an EMI filtering circuit, an AC-DC circuit, a dimming control circuit, a main control circuit, a dimming signal circuit, and the power-down storage circuit as described above;

[0008] The EMI filtering circuit is connected between an external power supply and the AC-DC circuit;

[0009] The dimming control circuit is connected between the AC-DC circuit and the lamp;

[0010] The control module is connected between the AC-DC circuit, the dimming control circuit, and the dimming signal circuit;

[0011] One end of resistor R1 and one end of resistor R2 are connected between the AC-DC circuit and the main control circuit to generate voltage signals V1 and V2 respectively; the collector of triode D2 is connected to the main control circuit to generate a voltage signal PowerDown.

[0012] As one of the preferred embodiments of the present invention, an LED dimming power supply further includes a diode D1 and a capacitor C1. The anode of the diode D1 is respectively connected to the AC-DC circuit and one end of the resistor R1. The cathode of the diode D1 is respectively connected to the VCC terminal, one end of the capacitor C1, and the main control circuit. The other end of the capacitor C1 is respectively connected to the AC-DC circuit, the main control circuit, and the GND terminal.

[0013] As one of the preferred embodiments of the present invention, the dimming control circuit is set as a chopper circuit.

[0014] As one of the preferred embodiments of the present invention, the dimming control circuit is set as a DC-DC circuit.

[0015] Advantages of the present utility model: A power-down preservation circuit and an LED dimming power supply with fast response and zero loss. The power-down preservation circuit includes resistors R1 - 4 and transistors Q1 - 2. One end of resistor R1 is connected to voltage signal V1, and one end of resistor R2 is connected to voltage signal V2. The other end of resistor R1 is connected to the base of transistor Q1, and the other end of resistor R2 is connected to the emitter of transistor Q1. The collector of transistor Q1 is connected to the base of transistor Q2 via resistor R4. The collector of transistor Q2 is connected to the VCC terminal via resistor R3 and outputs voltage signal Power Down. Voltage signal Power Down is connected to the main control circuit, and the emitter of transistor Q2 is connected to the GND terminal. Among them, when voltage signal V1 > voltage signal V2, voltage signal Power Down does not enable the main control circuit; when voltage signal V1 < voltage signal V2, voltage signal Power Down enables the main control circuit to execute saving the current data and the current dimming signal. Through the above structure, fast response and zero loss of power-down preservation can be achieved, which is convenient and simplified. Its circuit connection is simple, the number of components is small, the cost is low, the performance is stable, and space is saved, which is more conducive to the miniaturization of products. Description of the Drawings

[0016] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0017] Figure 1 It is a principle block diagram of an LED dimming power supply;

[0018] Figure 2 It is a circuit schematic diagram of an LED dimming power supply. Detailed Embodiments

[0019] This part will describe the specific embodiments of the present utility model in detail. The preferred embodiments of the present utility model are shown in the accompanying drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it cannot be understood as a limitation on the protection scope of the present utility model.

[0020] In the description of the present utility model, the meaning of "a plurality" is more than two. Understandings such as "greater than", "less than", and "exceeding" do not include the present number, and understandings such as "above", "below", and "within" include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0021] In the description of the present utility model, it should be understood that when it comes to the description of directions, such as the directions or positional relationships indicated by up, down, front, back, left, right, etc., they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be construed as a limitation to the present utility model.

[0022] In the present utility model, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. 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, and can also be integrally formed; they can be mechanically connected; they can be the communication inside two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0023] Referring to Figures 1 to 2 , an LED dimming power supply includes an EMI filtering circuit 10, an AC-DC circuit 20, a dimming control circuit 30, a main control circuit 40, a dimming signal circuit 50, and a power-down protection circuit 60;

[0024] The EMI filtering circuit 10 is connected between an external power supply and the AC-DC circuit 20;

[0025] The dimming control circuit 30 is connected between the AC-DC circuit 20 and a lamp 70;

[0026] The control module is connected between the AC-DC circuit 20, the dimming control circuit 30, and the dimming signal circuit 50;

[0027] One end of a resistor R1 and one end of a resistor R2 are connected between the AC-DC circuit 20 and the main control circuit 40 to generate a voltage signal V1 and a voltage signal V2 respectively; the collector of a triode D2 is connected to the main control circuit 40 to generate a voltage signal Power Down.

[0028] Among them, the power-down save circuit includes resistors R1-4 and transistors Q1-2. One end of resistor R1 is connected to voltage signal V1, and one end of resistor R2 is connected to voltage signal V2. The other end of resistor R1 is connected to the base of transistor Q1, and the other end of resistor R2 is connected to the emitter of transistor Q1. The collector of transistor Q1 is connected to the base of transistor Q2 via resistor R4. The collector of transistor Q2 is connected to the VCC terminal via resistor R3 and outputs voltage signal Power Down. Voltage signal Power Down is connected to the main control circuit 40, and the emitter of transistor Q2 is connected to the GND terminal. When voltage signal V1 > voltage signal V2, voltage signal Power Down does not enable the main control circuit 40. When voltage signal V1 < voltage signal V2, voltage signal Power Down enables the main control circuit 40 to execute saving the current data and the current dimming signal.

[0029] Specifically, when the power is turned on, the AC alternating current passes through the EMI filter circuit 10 and is rectified into direct current by the rectifier bridge. When the AC-DC circuit 20 operates stably, due to the voltage outer loop feedback and the fixed turn ratio of the transformer, stable voltages V+ and VCC are output respectively. V+ is supplied to the dimming control circuit 30 and then connected to the lamp LED, and VCC is supplied to the main control module 40. The main control module 40 includes a single-chip microcomputer and other auxiliary circuits. The dimming signal circuit 50 outputs the DIM signal to the single-chip microcomputer, and the single-chip microcomputer then outputs PWM to the dimming control circuit 30. At this time, the lamp LED is lit.

[0030] Referring to Figure 2 , in one embodiment, an LED dimming power supply further includes a diode D1 and a capacitor C1. The anode of diode D1 is respectively connected to the AC-DC circuit 20 and one end of resistor R1. The cathode of diode D1 is respectively connected to the VCC terminal, one end of capacitor C1, and the main control circuit 40. The other end of capacitor C1 is respectively connected to the AC-DC circuit 20, the main control circuit 40, and the GND terminal.

[0031] When the power supply is working normally: When the AC-DC circuit 20 operates stably, capacitor C1 obtains a stable voltage of VCC. Due to the forward conduction voltage drop of diode D1, voltage signal V1 is greater than voltage signal V2. Voltage signal V1 passes through resistor R1 to the base of transistor Q1, and voltage signal V2 passes through resistor R2 to the emitter of transistor Q1. That is, the base voltage of transistor Q1 is greater than the emitter voltage of transistor Q1, so transistor Q1 is not turned on, no current flows through resistor R4, transistor Q2 is not turned on, and after VCC passes through resistor R3, voltage signal PowerDown is high and enters the single-chip microcomputer. At this time, the single-chip microcomputer does not perform any operation. Therefore, when the power supply is working normally, the power-down save circuit does not work, will not affect other signals, and there is no loss.

[0032] When the power supply is cut off: At this time, the voltage signal V1 drops rapidly. Since the voltage signal V2 is supported by the capacitance of the capacitor C1, the voltage signal V2 drops slowly. The higher the capacitance of the capacitor C1, the slower the voltage signal V2 drops. Therefore, when the power supply is cut off, since the voltage signal V2 is greater than the voltage signal V1, the voltage signal V1 passes through the resistor R1 to the base of the triode Q1, and the voltage signal V2 passes through the resistor R2 to the emitter of the triode Q1. That is, the emitter voltage of the triode Q1 is greater than the base voltage of the triode Q1, so the triode Q1 conducts. Then it passes through the collector of the triode Q1 and then through the resistor R4 to enter the base of the triode Q2, and the triode Q2 conducts, and the voltage signal PowerDown is pulled low. When the single-chip microcomputer detects that the voltage signal PowerDown is low, it immediately executes to save the current data and the current dimming signal, and then turns off the relevant signals according to the timing.

[0033] The advantages of the present invention are as follows: Through the above structure, fast response and zero loss of power-down preservation can be achieved, which is convenient and simple. Its circuit connection is simple, the number of components is small, the cost is low, the performance is stable, and the space is saved, which is more conducive to the miniaturization of the product.

[0034] In one embodiment, the triode Q1 is a PNP triode, and the triode Q2 is an NPN triode.

[0035] As the first embodiment of the dimming control circuit 30, the dimming control circuit 30 is set as a chopper circuit.

[0036] As the second embodiment of the dimming control circuit 30, the dimming control circuit 30 is set as a DC-DC circuit.

[0037] Of course, the present invention is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A fast-response zero-loss power-down storage circuit, characterized in that: It includes resistors R1 - 4 and transistors Q1 - 2. One end of resistor R1 is connected to voltage signal V1, and one end of resistor R2 is connected to voltage signal V2. The other end of resistor R1 is connected to the base of transistor Q1, and the other end of resistor R2 is connected to the emitter of transistor Q1. The collector of transistor Q1 is connected to the base of transistor Q2 through resistor R4. The collector of transistor Q2 is connected to the VCC terminal through resistor R3 and outputs voltage signal PowerDown, and voltage signal PowerDown is connected to the main control circuit (40). The emitter of transistor Q2 is connected to the GND terminal; Wherein, when voltage signal V1 > voltage signal V2, voltage signal PowerDown does not enable the main control circuit (40); when voltage signal V1 < voltage signal V2, voltage signal PowerDown enables the main control circuit (40) to execute saving the current data and the current dimming signal.

2. The power-down storage circuit with fast response and zero loss according to claim 1, wherein: Transistor Q1 is a PNP transistor, and transistor Q2 is an NPN transistor.

3. An LED dimming power supply, characterized in that: It includes an EMI filtering circuit (10), an AC - DC circuit (20), a dimming control circuit (30), a main control circuit (40), a dimming signal circuit (50), and the power - down saving circuit (60) according to any one of claims 1 - 2; The EMI filtering circuit (10) is connected between an external power supply and the AC - DC circuit (20); The dimming control circuit (30) is connected between the AC - DC circuit (20) and the lamp (70); The control module is connected between the AC - DC circuit (20), the dimming control circuit (30), and the dimming signal circuit (50); One end of resistor R1 and one end of resistor R2 are connected between the AC - DC circuit (20) and the main control circuit (40) to respectively generate voltage signal V1 and voltage signal V2; the collector of transistor D2 is connected to the main control circuit (40) to generate voltage signal PowerDown.

4. The LED dimming power supply according to claim 3, wherein: It further includes a diode D1 and a capacitor C1. The anode of diode D1 is respectively connected to the AC - DC circuit (20) and one end of resistor R1. The cathode of diode D1 is respectively connected to the VCC terminal, one end of capacitor C1, and the main control circuit (40). The other end of capacitor C1 is respectively connected to the AC - DC circuit (20), the main control circuit (40), and the GND terminal.

5. The LED dimming power supply according to claim 3, wherein: The dimming control circuit (30) is set as a chopper circuit.

6. The LED dimming power supply according to claim 3, wherein: The dimming control circuit (30) is set as a DC - DC circuit.

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