A lamp grounding non-isolated power supply with ac detection circuit

Abstract

The utility model discloses a kind of AC detection circuit's luminaire grounding non-isolated power supply, including the first rectifier filter circuit of AC power input end, MCU control circuit and drive circuit, still including the AC detection circuit being connected with AC power input end and grounding;AC detection circuit includes second rectifier filter circuit, the photoelectric coupler control circuit being connected with second rectifier filter circuit;The input end of second rectifier filter circuit is connected with AC power input end, the output end of photoelectric coupler control circuit is connected with grounding plug.The utility model's structure setting is reasonable, it is provided with AC detection circuit, and AC detection circuit includes the photoelectric coupler control circuit of second rectifier filter circuit, it can effectively solve the generation coupling interference AC detection foot when luminaire grounding by photoelectric coupling control circuit, it is favorable to promote the stability and reliability of luminaire grounding use, and overall circuit cost is low.

Description

Technical Field

[0001] This utility model belongs to the field of lighting driver power supply technology, specifically relating to a non-isolated power supply for lighting grounding with an AC detection circuit. Background Technology

[0002] Lighting fixtures are a common type of lighting and decorative electrical appliance. They are typically used in conjunction with corresponding driver power supplies, and non-isolated power supplies are a relatively important type of driver power supply. Existing non-isolated power supplies include a power management module, a detection module, and an MCU control module, as shown in CN202421853468.0. The detection module mainly consists of resistors, diodes, and capacitors. Although it can meet the detection requirements, it will generate coupling interference to the AC detection pin when grounded, thus affecting the stability and effectiveness of the detection, making it difficult to meet market demands. Utility Model Content

[0003] The purpose of this invention is to provide a non-isolated power supply for lamp grounding with an AC detection circuit that has a reasonable structural design and can solve the problem of coupling interference generated when the lamp is grounded.

[0004] The technical solution to achieve the purpose of this utility model is a non-isolated power supply for lamp grounding with an AC detection circuit, including an AC power input terminal, a first rectifier and filter circuit connected to the AC power input terminal, an MCU control circuit connected to the first rectifier and filter circuit, and a drive circuit connected to the MCU control circuit, and also includes an AC detection circuit connected to and grounded to the AC power input terminal.

[0005] The AC detection circuit includes a second rectifier filter circuit and an optocoupler control circuit connected to the second rectifier filter circuit.

[0006] The input terminal of the second rectifier filter circuit is connected to the AC power input terminal, and the output terminal of the optocoupler control circuit is connected to the grounding plug.

[0007] A further preferred embodiment is that the optocoupler control circuit includes a twelfth resistor, a thirteenth resistor, an optocoupler, a thirty-second resistor, and a twenty-first capacitor;

[0008] The twelfth and thirteenth resistors are connected in series and between the positive terminal of the second rectifier filter circuit and the positive terminal of the light-emitting diode of the optocoupler. The negative terminal of the light-emitting diode of the optocoupler is connected to the negative terminal of the second rectifier filter circuit.

[0009] The 21st capacitor is connected in parallel between the positive and negative terminals of the output of the optocoupler, and the negative terminal of the output of the optocoupler is grounded. The positive terminal of the output of the optocoupler is connected to the grounding plug.

[0010] One end of the thirty-second resistor is connected to the positive output terminal of the optocoupler, and the other end is connected to a 3.3V power supply.

[0011] A further preferred embodiment is that the grounding plug is connected to the PMW pin of the MCU control circuit.

[0012] The working principle of its AC detection circuit is briefly described as follows: When the AC power is turned on, after rectification by the BD2 bridge rectifier in the second rectifier and filter circuit and filtering by capacitor C1A into DC power, it passes through the twelfth resistor R12A and the thirteenth resistor R13A current-limiting resistor, and then through the LED of optocoupler U5. When current flows through the LED of optocoupler U5, it starts to work, and the transistor on the secondary side of optocoupler U5 starts to conduct. The 3.3V voltage from the upper bias resistor of the thirteenth resistor R32 is pulled to ground through the transistor of optocoupler U5, and the AC detection is low level. When the AC power is turned off, the LED of optocoupler U5 does not work, and the transistor inside optocoupler U5 also does not work. The 3.3V voltage from the upper bias resistor R32 is connected to the AC detection pin, and the AC detection pin is high level. The above AC detection circuit is mainly isolated from the ground of the subsequent AC detection through optocoupler. When the non-isolated power supply lamp is grounded, it is isolated so that when the lamp is grounded, no coupling interference is generated to the AC detection pin.

[0013] This utility model has positive effects: the structure of this utility model is reasonable, it is equipped with an AC detection circuit, and the AC detection circuit includes an optocoupler control circuit of the second rectifier filter circuit. When the lamp is grounded, the optocoupler control circuit can effectively solve the problem of coupling interference to the AC detection pin, which is conducive to improving the stability and reliability of the lamp grounding. In addition, the overall circuit cost is low and the applicability is strong. Attached Figure Description

[0014] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0015] Figure 1 This is a schematic diagram of the specific circuit structure of this utility model.

[0016] Figure reference numerals: AC power input terminal 1, first rectifier and filter circuit 2, MCU control circuit 3, drive circuit 4, AC detection circuit 5, second rectifier and filter circuit 51, optocoupler control circuit 52, grounding plug 53. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1

[0019] See Figure 1 A non-isolated power supply for lamp grounding with an AC detection circuit includes an AC power input terminal 1, a first rectifier and filter circuit 2 connected to the AC power input terminal, an MCU control circuit 3 connected to the first rectifier and filter circuit, and a drive circuit 4 connected to the MCU control circuit. In this embodiment, the above circuits are all conventional circuits of the prior art, so they are not described in detail, but are simply applied.

[0020] It also includes an AC detection circuit 5 connected to and grounded to the AC power input terminal; and the AC detection circuit includes a second rectifier and filter circuit 51 and an optocoupler control circuit 52 connected to the second rectifier and filter circuit; in connection, the input terminal of the second rectifier and filter circuit is connected to the AC power input terminal, and the output terminal of the optocoupler control circuit is connected to a grounding plug 53. The grounding plug is connected to the PWM pin of the MCU control circuit. The grounding plug enables the AC detection circuit to be connected to the MCU control circuit, and also enables the grounding connection of the AC detection circuit.

[0021] Furthermore, the optocoupler control circuit includes a twelfth resistor R12A, a thirteenth resistor R13A, an optocoupler U5, a thirty-second resistor R32, and a twenty-first capacitor C21. During connection, the twelfth and thirteenth resistors are connected in series to form a current-limiting resistor, which limits current. These resistors are connected between the positive terminal of the second rectifier filter circuit and the positive terminal of the optocoupler's LED. The negative terminal of the optocoupler's LED is connected to the negative terminal of the second rectifier filter circuit. The twenty-first capacitor is connected in parallel between the positive and negative terminals of the optocoupler's output. The negative terminal of the optocoupler's output is grounded, and the positive terminal of the optocoupler's output is connected to a grounding plug. One end of the thirty-second resistor is connected to the positive terminal of the optocoupler's output, and the other end is connected to a 3.3V power supply.

[0022] The working principle of its AC detection circuit is briefly described as follows: When the AC power is turned on, after rectification by the BD2 bridge rectifier in the second rectifier and filter circuit and filtering by capacitor C1A into DC power, it passes through the twelfth resistor R12A and the thirteenth resistor R13A current-limiting resistor, and then through the LED of optocoupler U5. When current flows through the LED of optocoupler U5, it starts to work, and the transistor on the secondary side of optocoupler U5 starts to conduct. The 3.3V voltage from the upper bias resistor of the thirteenth resistor R32 is pulled to ground through the transistor of optocoupler U5, and the AC detection is low level. When the AC power is turned off, the LED of optocoupler U5 does not work, and the transistor inside optocoupler U5 also does not work. The 3.3V voltage from the upper bias resistor R32 is connected to the AC detection pin, and the AC detection pin is high level. The above AC detection circuit is mainly isolated from the ground of the subsequent AC detection through optocoupler. When the non-isolated power supply lamp is grounded, it is isolated so that when the lamp is grounded, no coupling interference is generated to the AC detection pin.

[0023] This utility model has positive effects: the structure of this utility model is reasonable, it is equipped with an AC detection circuit, and the AC detection circuit includes an optocoupler control circuit of the second rectifier filter circuit. When the lamp is grounded, the optocoupler control circuit can effectively solve the problem of coupling interference to the AC detection pin, which is conducive to improving the stability and reliability of the lamp grounding. In addition, the overall circuit cost is low and the applicability is strong.

[0024] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural parts described in the instruction manual can also be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0025] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, these obvious variations or modifications derived from the essential spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A non-isolated power supply for lamp grounding with an AC detection circuit, comprising an AC power input terminal, a first rectifier and filter circuit connected to the AC power input terminal, an MCU control circuit connected to the first rectifier and filter circuit, and a drive circuit connected to the MCU control circuit, characterized in that: It also includes an AC detection circuit that is connected to and grounded to the AC power input terminal; The AC detection circuit includes a second rectifier filter circuit and an optocoupler control circuit connected to the second rectifier filter circuit. The input terminal of the second rectifier filter circuit is connected to the AC power input terminal, and the output terminal of the optocoupler control circuit is connected to the grounding plug.

2. A non-isolated power supply for lamp grounding with an AC detection circuit according to claim 1, characterized in that: The optocoupler control circuit includes a twelfth resistor, a thirteenth resistor, an optocoupler, a thirty-second resistor, and a twenty-first capacitor; The twelfth and thirteenth resistors are connected in series and between the positive terminal of the second rectifier filter circuit and the positive terminal of the light-emitting diode of the optocoupler. The negative terminal of the light-emitting diode of the optocoupler is connected to the negative terminal of the second rectifier filter circuit. The 21st capacitor is connected in parallel between the positive and negative terminals of the output of the optocoupler, and the negative terminal of the output of the optocoupler is grounded, while the positive terminal of the output of the optocoupler is connected to the grounding plug. One end of the thirty-second resistor is connected to the positive output terminal of the optocoupler, and the other end is connected to a 3.3V power supply.

3. A non-isolated power supply for lamp grounding with an AC detection circuit according to claim 1, characterized in that: The grounding plug is connected to the PMW pin of the MCU control circuit.

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