Power supply circuit

Abstract

The utility model discloses a power supply circuit, and relates to the technical field of power supplies, the power supply circuit comprises a rectifier, a first input end of the rectifier is connected with a live wire, a second input end of the rectifier and a zero line are used as first output ends, and the first output ends are connected with two electrodes of an electric appliance; the anode output end of the rectifier is connected with the anode of the one-way silicon controlled rectifier, the control electrode of the one-way silicon controlled rectifier is used for receiving a switch control signal, and the cathode of the one-way silicon controlled rectifier serves as the anode of the second output end and is used for supplying power to the standard voltage chip; one end of the voltage division circuit is connected with the cathode of the unidirectional silicon controlled rectifier, and the other end is grounded; one end of the first resistor is connected with the anode output end of the rectifier, the other end of the first resistor is connected with one end of the second resistor, and the other end of the second resistor is connected with the cathode of the unidirectional silicon controlled rectifier. The circuit is simple in structure and easy to manufacture, and a single-live-wire wiring mode is adopted, so that the cost of the whole circuit is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a power supply circuit. Background Art

[0002] In order to make the switch control of household appliances intelligent, single-live smart switches have gradually replaced traditional mechanical wall switches, which can achieve more intelligent and convenient functions. Since electronic intelligent lighting switches themselves need to consume a certain amount of current, and most ordinary households at home and abroad are wired with a single live wire, single-live power supply technology has been developed. In addition, metal wires are becoming more and more expensive, and the cost of running an extra wire is much higher than the cost of implementing a single live wire on the switch itself.

[0003] In recent years, single-live-wire power supply technology has been developed and can cope with the above-mentioned scenarios well. However, there are several common problems with single-live-wire switches on the market: First, some products that use discrete devices will cause the light to flicker at the moment of turning on and off, which affects the life of the light and provides a poor user experience. Second, some products that use integrated circuit calculations to avoid flickering when switching lights have a large voltage difference when the light is turned off and on, so most of the chips used are low-power chips with high costs and poor load matching. Utility Model Content

[0004] The purpose of the utility model is to provide a power supply circuit. When the electrical appliance of the present application is a lamp, the advantage of using an integrated circuit to solve the flickering of the lamp at the moment of switching on and off is retained; the disadvantage of power supply balance when the lamp is turned off and the lamp is turned on is solved when a single live wire is used for power supply; and the cost is saved on the basis of the existing integrated circuit solution.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] One aspect of an embodiment of the utility model provides a power supply circuit, which includes: a rectifier, wherein a first input end of the rectifier is connected to a live wire, a second input end of the rectifier and a neutral wire serve as a first output end, the second input end of the rectifier is connected to a first input end of an electrical appliance, and a second input end of the electrical appliance is connected to a neutral wire; a unidirectional thyristor, wherein a positive output end of the rectifier is connected to an anode of the unidirectional thyristor, a control electrode of the unidirectional thyristor is used to receive a switch control signal, a cathode of the unidirectional thyristor serves as a positive electrode of a second output end, and a negative output end of the rectifier serves as a ground point of the second output end; a voltage divider circuit, wherein one end of the voltage divider circuit is connected to the cathode of the unidirectional thyristor, and the other end of the voltage divider circuit is grounded; a first resistor and a second resistor, wherein one end of the first resistor is connected to the positive output end of the rectifier, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the cathode of the unidirectional thyristor.

[0007] In some embodiments, the power supply circuit also includes a third resistor and a first NMOS tube, one end of the third resistor is connected to the control electrode of the unidirectional thyristor and the drain of the first NMOS tube, the other end of the third resistor is connected to the other end of the first resistor and one end of the second resistor, the source of the first NMOS tube is grounded, and the gate of the first NMOS tube is used to receive the switching control signal of the unidirectional thyristor.

[0008] In some embodiments, the power supply circuit also includes a fourth resistor, a fifth resistor and a second NMOS tube, one end of the fourth resistor is connected to the cathode of the unidirectional thyristor, the other end of the fourth resistor is connected to the gate of the first NMOS tube and the drain of the second NMOS tube, the source of the second NMOS tube is grounded, and the gate of the second NMOS tube receives the switching control signal of the unidirectional thyristor through the fifth resistor.

[0009] In some embodiments, the power supply circuit further includes a capacitor, a positive electrode of the capacitor is connected to the cathode of the unidirectional thyristor, and a negative electrode of the capacitor is grounded.

[0010] In some embodiments, the voltage divider circuit includes a first diode and a second diode, the anode of the first diode is connected to the cathode of the unidirectional thyristor, the cathode of the first diode is connected to the anode of the second diode, and the cathode of the second diode is grounded.

[0011] In some embodiments, the voltage divider circuit further includes a third diode and a fourth diode, the anode of the third diode is connected to the cathode of the second diode, the cathode of the third diode is connected to the anode of the fourth diode, and the cathode of the fourth diode is grounded.

[0012] In some embodiments, the rectifier is a rectifier bridge.

[0013] A power supply circuit according to an embodiment of the utility model has at least the following beneficial effects: the circuit structure is simple and easy to manufacture, and the single live wire wiring form is adopted, so that the overall circuit saves cost. When the electrical appliance of the present application is a lamp, the first diode, the second diode, the third diode and the fourth diode are adopted to clamp the supply voltage when the lamp is turned off, and to draw power under high current conditions when the lamp is turned on, so that the supply voltage can always reach the voltage of the standard voltage chip, and the standard voltage chip can be used, which saves cost on the chip and does not affect the operation of the lamp.

[0014] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of a power supply circuit according to some embodiments of the present application. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present disclosure will be more comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0021] The technical solution of the embodiment of the present application is briefly described below:

[0022] According to some embodiments, Figure 1 As shown, the present application provides a power supply circuit, the power supply circuit comprising:

[0023] A rectifier DB1, a first input end of the rectifier DB1 is connected to the live wire, a second input end of the rectifier DB1 and a neutral wire serve as a first output end, a second input end of the rectifier DB1 is connected to a first input end of an electrical appliance, and a second input end of the electrical appliance is connected to the neutral wire;

[0024] The one-way thyristor Q1, the positive output terminal of the rectifier DB1 is connected to the anode of the one-way thyristor Q1, the control electrode of the one-way thyristor Q1 is used to receive the switch control signal, the cathode of the one-way thyristor Q1 is used as the positive electrode of the second output terminal, and the negative output terminal of the rectifier DB1 is used as the location of the second output terminal;

[0025] A voltage divider circuit, one end of the voltage divider circuit is connected to the cathode of the unidirectional thyristor Q1, and the other end of the voltage divider circuit is grounded;

[0026] A first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the positive output end of the rectifier DB1, the other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the cathode of the unidirectional thyristor Q1.

[0027] The working principle based on the above embodiment is that when the switch control signal received by the control electrode of the unidirectional thyristor Q1 is at a high level, the unidirectional thyristor Q1 is turned on, and the cathode of the unidirectional thyristor Q1 outputs power; when the switch control signal received by the control electrode of the unidirectional thyristor Q1 is at a low level, the unidirectional thyristor Q1 is turned off, and the cathode of the unidirectional thyristor Q1 does not output power. Among them, the voltage divider circuit divides the cathode voltage of the unidirectional thyristor Q1 to the standard voltage, and then the cathode of the unidirectional thyristor Q1 supplies power to the standard voltage chip. When the unidirectional thyristor Q1 is turned off, the first resistor R1 and the second resistor R2 take power from the high voltage, and the diode clamps the voltage to supply power to the standard voltage chip.

[0028] In some embodiments, the rectifier DB1 adopts a rectifier bridge.

[0029] In some embodiments, the electrical appliance of the present application is a lamp. When the electrical appliance of the present application is a lamp, the advantages of using an integrated circuit to solve the flickering of the lamp at the moment of switching on and off are retained; the disadvantage of power supply balance when the lamp is turned off and on when a single live wire is used for power supply is solved; and the cost is saved on the basis of the existing integrated circuit solution.

[0030] The following is combined with the appendix of this manual Figure 1 , the preferred implementation modes of the present disclosure are further elaborated in detail.

[0031] According to some embodiments, Figure 1As shown, in addition to the above connection structure, the power supply circuit also includes a third resistor R3 and a first NMOS tube QN1, one end of the third resistor R3 is connected to the control electrode of the unidirectional thyristor Q1 and the drain of the first NMOS tube QN1, the other end of the third resistor R3 is connected to the other end of the first resistor R1 and one end of the second resistor R2, the source of the first NMOS tube QN1 is grounded, and the gate of the first NMOS tube QN1 is used to receive the switch control signal of the unidirectional thyristor Q1.

[0032] Based on the working principle of the above embodiment, when the switch control signal received by the gate of the first NMOS tube QN1 is at a high level, the first NMOS tube QN1 is turned on, and the voltage of the control electrode of the unidirectional thyristor Q1 is pulled down, so that the unidirectional thyristor Q1 is turned off; when the switch control signal received by the gate of the first NMOS tube QN1 is at a low level, the first NMOS tube QN1 is turned off, and the first resistor R1 and the third resistor R3 pull up the voltage of the control electrode of the unidirectional thyristor Q1, so that the unidirectional thyristor Q1 is turned on.

[0033] Further, such as Figure 1 As shown, in addition to the above connection structure, the power supply circuit also includes a fourth resistor R4, a fifth resistor R5 and a second NMOS tube QN2, one end of the fourth resistor R4 is connected to the cathode of the unidirectional thyristor Q1, the other end of the fourth resistor R4 is connected to the gate of the first NMOS tube QN1 and the drain of the second NMOS tube QN2, the source of the second NMOS tube QN2 is grounded, and the gate of the second NMOS tube QN2 receives the switch control signal of the unidirectional thyristor Q1 through the fifth resistor R5.

[0034] Based on the working principle of the above embodiment, when the switch control signal received by the gate of the second NMOS tube QN2 is at a high level, the second NMOS tube QN2 is turned on, the first NMOS tube QN1 is turned off, and the first resistor R1 and the third resistor R3 pull up the voltage of the control electrode of the unidirectional thyristor Q1, so that the unidirectional thyristor Q1 is turned on; when the switch control signal received by the gate of the second NMOS tube QN2 is at a low level, the second NMOS tube QN2 is turned off, the first NMOS tube QN1 is turned on to pull down the voltage of the control electrode of the unidirectional thyristor Q1, so that the unidirectional thyristor Q1 is turned off.

[0035] Compared with the control mode of only the first NMOS tube QN1, the first NMOS tube QN1 and the second NMOS tube QN2 make the control opposite. That is, when only the first NMOS tube QN1 is provided: when the switch control signal is at a high level, the unidirectional thyristor Q1 is turned off; when the switch control signal is at a low level, the unidirectional thyristor Q1 is turned on. When the first NMOS tube QN1 and the second NMOS tube QN2 are provided: when the switch control signal is at a high level, the unidirectional thyristor Q1 is turned on; when the switch control signal is at a low level, the unidirectional thyristor Q1 is turned off. The two connection modes are set according to actual needs.

[0036] According to some embodiments, Figure 1 As shown, the power supply circuit further includes a capacitor E1, the positive electrode of the capacitor E1 is connected to the cathode of the unidirectional thyristor Q1, and the negative electrode of the capacitor E1 is grounded.

[0037] According to some embodiments, Figure 1 As shown, the voltage divider circuit includes a first diode D1 and a second diode D2, the anode of the first diode D1 is connected to the cathode of the unidirectional thyristor Q1, the cathode of the first diode D1 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is grounded.

[0038] Further, such as Figure 1 As shown, the voltage divider circuit further includes a third diode D3 and a fourth diode D4, the anode of the third diode D3 is connected to the cathode of the second diode D2, the cathode of the third diode D3 is connected to the anode of the fourth diode D4, and the cathode of the fourth diode D4 is grounded.

[0039] Based on the above embodiments, the number of diodes is set according to actual needs. The more diodes are set, the higher the cathode voltage of the unidirectional thyristor Q1 can be. The cathode of the unidirectional thyristor Q1 supplies power to the standard voltage chip. Therefore, in some preferred embodiments of the present application, a total of four diodes are set, namely, the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4.

[0040] The working principle of this application is as follows: Figure 1 As shown, when the control electrode of the unidirectional thyristor Q1 receives a high level, the unidirectional thyristor Q1 is turned on, the cathode of the unidirectional thyristor Q1 outputs power, the electrical appliance is powered on, and the voltage standard chip is powered on. When the control electrode of the unidirectional thyristor Q1 receives a low level, the unidirectional thyristor Q1 is turned off, the cathode of the unidirectional thyristor Q1 does not output power, the electrical appliance is not powered on and stops working, and the voltage standard chip is powered by the first resistor R1 and the second resistor R2.

[0041] The circuit structure of the present application is simple and easy to manufacture, and adopts the form of single live wire wiring, so that the overall circuit saves cost. When the electrical appliance of the present application is a lamp, the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 are used to clamp the supply voltage when the lamp is turned off, and to draw power under high current conditions when the lamp is turned on, so that the supply voltage can always reach the voltage of the standard voltage chip, and the standard voltage chip can be used, saving cost on the chip, and at the same time does not affect the operation of the lamp.

[0042] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0043] Although the present disclosure has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present disclosure can be implemented in a variety of forms without departing from the spirit or essence of the present application, it should be understood that the above-mentioned embodiments are not limited to any of the foregoing details, but should be widely interpreted within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A power supply circuit, characterized in that: The power supply circuit comprises: A rectifier, wherein a first input end of the rectifier is connected to a live wire, a second input end of the rectifier and a neutral wire serve as a first output end, a second input end of the rectifier is connected to a first input end of an electrical appliance, and a second input end of the electrical appliance is connected to a neutral wire; A unidirectional thyristor, wherein the positive output terminal of the rectifier is connected to the anode of the unidirectional thyristor, the control electrode of the unidirectional thyristor is used to receive a switch control signal, the cathode of the unidirectional thyristor serves as the positive electrode of the second output terminal, and the negative output terminal of the rectifier serves as the location of the second output terminal; A voltage divider circuit, one end of which is connected to the cathode of the unidirectional thyristor, and the other end of which is grounded; A first resistor and a second resistor, one end of the first resistor is connected to the positive output end of the rectifier, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the cathode of the unidirectional thyristor.

2. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes a third resistor and a first NMOS tube, one end of the third resistor is connected to the control electrode of the unidirectional thyristor and the drain of the first NMOS tube, the other end of the third resistor is connected to the other end of the first resistor and one end of the second resistor, the source of the first NMOS tube is grounded, and the gate of the first NMOS tube is used to receive a switch control signal of the unidirectional thyristor.

3. The power supply circuit according to claim 2, characterized in that: The power supply circuit also includes a fourth resistor, a fifth resistor and a second NMOS tube, one end of the fourth resistor is connected to the cathode of the unidirectional thyristor, the other end of the fourth resistor is connected to the gate of the first NMOS tube and the drain of the second NMOS tube, the source of the second NMOS tube is grounded, and the gate of the second NMOS tube receives the switch control signal of the unidirectional thyristor through the fifth resistor.

4. The power supply circuit according to claim 1, characterized in that: The power supply circuit further comprises a capacitor, the positive electrode of the capacitor is connected to the cathode of the unidirectional thyristor, and the negative electrode of the capacitor is grounded.

5. The power supply circuit according to claim 1, characterized in that: The voltage divider circuit includes a first diode and a second diode, wherein the anode of the first diode is connected to the cathode of the unidirectional thyristor, the cathode of the first diode is connected to the anode of the second diode, and the cathode of the second diode is grounded.

6. The power supply circuit according to claim 5, characterized in that: The voltage divider circuit further includes a third diode and a fourth diode, wherein the anode of the third diode is connected to the cathode of the second diode, the cathode of the third diode is connected to the anode of the fourth diode, and the cathode of the fourth diode is grounded.

7. The power supply circuit according to claim 1, characterized in that: The rectifier adopts a rectifier bridge.

Images