A dimmer circuit that uses a relay to perform switching action

Abstract

The present invention relates to a dimmer circuit that uses a relay to perform a switching action, which includes: an isolated zero-crossing detection circuit, a rectifier circuit, a control circuit, an isolated drive phase-cutting circuit, a control signal input component and a relay. The dimmer circuit of the present invention uses a relay instead of a commonly used single-pole single-throw switch to perform the on-off action of the dimmer. When the dimmer performs a closing operation, the relay is released, and the two input lines of the load are completely cut off, so that the load is safely separated from the mains, avoiding the safety hazard that when the existing dimmer uses a single-pole single-throw switch to perform a closing operation, only one input line of the load is cut off, and the load cannot be completely separated from the mains; the dimmer of the present invention uses an isolated power supply, an isolated zero-crossing detection circuit and an isolated drive phase-cutting circuit at the same time, so that the control signal input component is safely isolated from the mains, ensuring the user's operating safety.

Description

Technical Field

[0001] The present invention relates to the field of lighting circuits, and in particular to a dimmer circuit that uses a relay to perform a switching action. Background Art

[0002] At present, the switch control of the dimmer uses a single-pole single-throw switch. In the off state, it only cuts off one line of the dimmer load, and the other line is still connected to the mains. If the neutral line is not cut off, the load is still energized when the dimmer is turned off. If you go to repair the line or replace the load, there is a risk of electric shock. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a dimmer circuit that uses a relay to perform switching actions, which can effectively avoid the safety hazard of being connected to the mains when shutting down, and can ensure the safety of users.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A dimmer circuit using a relay to perform a switching action, characterized by comprising: an isolated zero-crossing detection circuit, a rectifier circuit, a control circuit, an isolated drive phase-cutting circuit, a control signal input component and a relay;

[0006] The isolated zero-crossing detection circuit is used to detect the zero-crossing signals of the first input of the mains live wire and the second input of the mains live wire, and provide the zero-crossing signals to the control circuit for use after safe isolation, so that the control circuit and the control signal input component are safely isolated from the mains;

[0007] The rectifier circuit rectifies the AC mains signal flowing through the dimmer load and the first input of the mains live wire or the second input of the mains live wire into a DC signal of a positive half cycle, and provides the signal to the isolation drive phase cutting circuit for phase cutting to achieve dimming of the dimmer load;

[0008] The control circuit receives the control signal of the control signal input component and the zero-crossing signal of the isolated zero-crossing detection circuit to control the on and off of the relay; and the control circuit outputs a phase-cutting angle control signal to the isolated drive phase-cutting circuit to implement phase cutting of the DC positive half-cycle voltage output by the rectifier circuit to implement load dimming;

[0009] The isolation driving phase cutting circuit isolates the phase cutting driving signal from the control circuit, and according to the input phase cutting signal, performs phase cutting on the DC positive half cycle voltage output by the rectifier circuit to perform the function of load dimming;

[0010] The control signal input component is used to transmit the switching signal of the dimmer and the phase angle parameter of the phase-cut dimming to the control circuit;

[0011] The relay is a dimmer switch action actuator, which performs the on-off action between the dimmer and the load; when the dimmer is turned off, the relay completely cuts off the connection between the dimmer and the load, so that the load is safely separated from the mains.

[0012] The dimmer circuit as described in the above embodiment is characterized by: further comprising an isolated power supply, wherein the isolated power supply provides separate isolated working power supplies for the control circuit and the isolated drive phase-cutting circuit respectively, so that the control circuit and the control signal input component are safely isolated from the mains.

[0013] The dimmer circuit as described in the above-mentioned embodiment is characterized in that: the first input end of the isolated power supply is connected to the first input of the mains live wire, the second input end is connected to the second input of the mains live wire, and the third input end is connected to the mains input neutral line input; the first isolated output power supply end of the isolated power supply is connected to the control circuit to provide an isolated and safe working power supply for the control circuit, and the second isolated output power supply end of the isolated power supply is connected to the isolated drive phase-cutting circuit to provide a working power supply for the isolated drive phase-cutting circuit.

[0014] The dimmer circuit as described in the above embodiment is characterized in that: the first input terminal of the isolated zero-crossing detection circuit is connected to the first input of the mains live wire, and the second input terminal is connected to the second input of the mains live wire, and is used to detect the voltage zero-crossing signal on the two input lines of the first input of the mains live wire and the second input of the mains live wire; the third input terminal N of the isolated zero-crossing detection circuit is connected to the mains zero line input, and its two isolated voltage zero-crossing signal output terminals are connected to the control circuit, providing the voltage zero-crossing signal of the first input of the mains live wire and the second input of the mains live wire to the control circuit respectively.

[0015] The dimmer circuit as described in the above embodiment is characterized in that: the first input end of the rectifier circuit is connected to the first input of the AC live wire, the second input end is connected to the second input of the AC live wire, and the third input end is connected to the live wire output end of the dimmer load through a group of contacts of the relay; the two output ends of the rectifier circuit are connected to the isolated drive phase-cutting circuit to provide the rectified DC positive half-cycle voltage to the isolated drive phase-cutting circuit.

[0016] The dimmer circuit as described in the above embodiment is characterized in that: the control circuit is respectively connected to the two isolated voltage zero-crossing signal output terminals of the isolated zero-crossing detection circuit, to the first isolated output power supply terminal of the isolated power supply, and to the output terminal of the control signal input component; the phase-cutting signal output terminal of the control circuit is connected to the isolated drive phase-cutting circuit, and the relay drive output terminal of the control circuit is connected to the relay.

[0017] The dimmer circuit as described in the above embodiment is characterized in that: the isolated driving phase-cutting circuit uses a field effect transistor as a switching element to perform phase-cutting operation; the isolated driving phase-cutting circuit is respectively connected to the phase-cutting driving signal output end of the control circuit, to the second isolated output power supply end of the isolated power supply, and to the two output ends of the rectifier circuit.

[0018] The dimmer circuit as described in the above embodiment is characterized in that: the relay adopts a double-pole single-throw relay, one group of contacts are respectively connected to the input end of the rectifier circuit and the live wire output end of the dimmer load; the other group of contacts are respectively connected to the mains neutral wire input end and the dimmer load neutral wire output end; the coil of the relay is connected to the relay drive output end of the control circuit, and the on-off action of the relay is controlled by the control circuit.

[0019] The dimmer circuit as described in the above-mentioned embodiment is characterized in that: when the relay performs the on action, the two groups of contacts are energized, and the input end LO of the rectifier circuit is connected to the live wire output end of the dimmer load, and the neutral wire input end of the AC power is connected to the neutral wire output end of the dimmer load, so that a working circuit is formed between the dimmer and the dimmer load; when the relay performs the off action, the two groups of contacts are released, the live wire output end of the dimmer load and the neutral wire output end of the load are completely disconnected from the dimmer circuit, and the dimmer load is safely isolated from the AC power.

[0020] The dimmer circuit as described in the above embodiment is characterized in that: the output signal end of the control signal input component is connected to the control circuit; the control signal input component uses a button switch or a toggle switch to generate an on-off signal, and uses a coding potentiometer, a variable resistor potentiometer and a button switch to set the phase angle parameters.

[0021] Since the present invention adopts the above technical scheme, it has the following advantages: the present invention adopts a relay instead of a commonly used single-pole single-throw switch to execute the on-off action of the dimmer; uses an isolated power supply, an isolated zero-crossing detection circuit and an isolated drive phase-cutting circuit, so that when the dimmer is in the off state, the load is safely separated from the mains, avoiding the safety hazard of the existing dimmer using a single-pole single-throw switch, which still has a connection with the mains when it is turned off, and at the same time allows the control signal input component to be safely isolated from the mains, ensuring the safety of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1As shown, the present invention provides a dimmer circuit using a relay to perform a switching action, which includes an isolated zero-crossing detection circuit 1, an isolated power supply 2, a rectifier circuit 3, a control circuit 4, an isolated drive phase-cutting circuit 5, a control signal input component 6 and a relay 7. Among them:

[0025] The isolated zero-crossing detection circuit 1 is used to detect the zero-crossing signals of the first input of the mains live wire and the second input of the mains live wire, and provide the zero-crossing signals to the control circuit 4 after safe isolation, so that the control circuit 4 and the control signal input component 6 are safely isolated from the mains.

[0026] The isolated power supply 2 provides separate isolated working power supplies for the control circuit 4 and the isolated drive phase-cutting circuit 5, respectively, so that the control circuit 4 and the control signal input component 6 are safely isolated from the mains.

[0027] The rectifier circuit 3 rectifies the AC mains signal flowing through the dimmer load and the first input of the mains live wire or the second input of the mains live wire into a DC signal of a positive half cycle, and provides it to the isolated drive phase-cutting circuit 5 for phase cutting to achieve dimming of the dimmer load; when the isolated drive phase-cutting circuit 5 is turned off, the rectifier circuit 3 isolates the first input of the mains live wire and the second input of the mains live wire, so that the isolated zero-crossing detection circuit 1 can respectively detect the independent voltage zero-crossing signals of the first input of the mains live wire and the second input of the mains live wire.

[0028] The control circuit 4 receives the control signal of the control signal input component 6 and the zero-crossing signal of the isolated zero-crossing detection circuit 1 to control the on and off of the relay 7; and the control circuit 4 outputs a phase-cutting angle control signal to the isolated drive phase-cutting circuit 5 to achieve phase cutting of the DC positive half-cycle voltage output by the rectifier circuit 3, thereby achieving load dimming.

[0029] The isolated driving phase cutting circuit 5 isolates the phase cutting driving signal from the control circuit 4, and according to the input phase cutting signal, performs phase cutting on the DC positive half-cycle voltage output by the rectifier circuit 3 to perform the function of load dimming.

[0030] The control signal input component 6 is used to transmit the switching signal of the dimmer and the phase angle parameter of the phase-cut dimming to the control circuit 4 .

[0031] Relay 7 is a dimmer switch actuator, which performs the on-off action between the dimmer and the load; when the dimmer is turned off, the relay 7 completely cuts off the connection between the dimmer and the load, so that the load is safely separated from the mains.

[0032] In a preferred embodiment, the first input terminal L1 of the isolated zero-crossing detection circuit 1 is connected to the first input of the mains live wire, and the second input terminal L2 is connected to the second input of the mains live wire, and is used to detect the voltage zero-crossing signals on the two input lines of the first input of the mains live wire and the second input of the mains live wire; the third input terminal N of the isolated zero-crossing detection circuit 1 is connected to the mains zero line input, and the two isolated voltage zero-crossing signal output terminals DT1 and DT2 of the isolated zero-crossing detection circuit 1 are connected to the control circuit 4, and the voltage zero-crossing signals of the first input of the mains live wire and the second input of the mains live wire are provided to the control circuit 4 respectively, so that the control circuit 4 and the control signal input component 6 are fully isolated from the mains.

[0033] In a preferred embodiment, the first input terminal L1 of the isolated power supply 2 is connected to the first input of the mains live wire, the second input terminal L2 is connected to the second input of the mains live wire, and the third input terminal N is connected to the mains input neutral line input, so as to ensure that whether the mains is connected from the first input of the mains live wire or the second input of the mains live wire, an isolated safe power supply can be output; the first isolated output power supply terminal V1+ of the isolated power supply 2 is connected to the control circuit 4 to provide an isolated and safe working power supply for the control circuit 4, so that the control circuit 4 and the control signal input component 6 are safely isolated from the mains, ensuring the user's operation safety; the second isolated output power supply terminal V2+ of the isolated power supply 2 is connected to the isolated drive phase-cutting circuit 5 to provide a working power supply for the isolated drive phase-cutting circuit 5.

[0034] In a preferred embodiment, the first input terminal L1 of the rectifier circuit 3 is connected to the first input of the mains live wire, the second input terminal L2 is connected to the second input of the mains live wire, and the third input terminal LO is connected to the live wire output terminal of the dimmer load through a group of contacts of the relay 7; the two output terminals LC and LG of the rectifier circuit 3 are connected to the isolation drive phase cutting circuit 5, and the rectified DC positive half-cycle voltage is provided to the isolation drive phase cutting circuit 5; when the isolation drive phase cutting circuit 5 is closed, the rectifier circuit 3 isolates the first input of the mains live wire and the second input of the mains live wire, so that the isolation zero-crossing detection circuit 1 can detect the independent voltage zero-crossing signals of the first input of the mains live wire and the second input of the mains live wire respectively.

[0035] In a preferred embodiment, the control circuit 4 is respectively connected to the two isolated voltage zero-crossing signal output terminals DT1 and DT2 of the isolated zero-crossing detection circuit 1, connected to the first isolated output power supply terminal V1+ of the isolated power supply 2, and connected to the output terminal SN of the control signal input component 6; the phase-cutting signal output terminal DR of the control circuit 4 is connected to the isolated drive phase-cutting circuit 5, and the relay drive output terminal RL of the control circuit 4 is connected to the relay 7. The control circuit 4 controls the relay 7 to perform on-off operations according to the signal sent by the control signal input component 6 and the voltage zero-crossing signal state of the first input of the mains live line and the second input of the mains live line output by the isolated zero-crossing detection circuit 1; according to the phase-cutting angle parameter set by the control signal input component 6 and the voltage zero-crossing signal output by the isolated zero-crossing detection circuit 1, the corresponding control signal is output to the isolated drive phase-cutting circuit 5, and the DC positive half-cycle voltage output by the rectifier circuit 3 is phase-cut to achieve dimming of the dimmer load.

[0036] In a preferred embodiment, the isolated driving phase cutting circuit 5 uses a field effect tube as a switching element to perform phase cutting operation. The isolated driving phase cutting circuit 5 is respectively connected to the phase cutting driving signal output terminal DR of the control circuit 4, connected to the second isolated output power supply terminal V2+ of the isolated power supply 2, and connected to the two output terminals LC and LG of the rectifier circuit 3. After isolating the phase cutting control signal from the control circuit 4, the isolated driving phase cutting circuit 5 drives the field effect tube to perform phase cutting on the DC positive half-cycle voltage output by the rectifier circuit 3, thereby dimming the load of the dimmer.

[0037] In a preferred embodiment, the output signal terminal SN of the control signal input component 6 is connected to the control circuit 4; the control signal input component 6 uses a button switch or a toggle switch to generate an on-off signal, and uses a coding potentiometer, a variable resistor potentiometer and a button switch to set the phase angle parameters.

[0038] In a preferred embodiment, the relay 7 adopts a double-pole single-throw relay, one set of contacts are respectively connected to the input terminal LO of the rectifier circuit 3 and the live output terminal of the dimmer load; the other set of contacts are respectively connected to the neutral input terminal of the mains and the neutral output terminal of the dimmer load. The coil of the relay 7 is connected to the relay drive output terminal RL of the control circuit 4, and the on-off action of the relay 7 is controlled by the control circuit 4. When the relay 7 performs the on action, the two sets of contacts are attracted, and the input terminal LO of the rectifier circuit 3 is connected to the live output terminal of the dimmer load, and the neutral input terminal of the mains is connected to the neutral output terminal of the dimmer load, so that a working circuit is formed between the dimmer and the dimmer load; when the off action is performed, the two sets of contacts are released, and the live output terminal of the dimmer load and the neutral output terminal of the load are completely separated from the dimmer circuit, and the dimmer load is safely isolated from the mains.

[0039] To sum up, when the present invention is in use, its circuit working process is as follows: the control circuit 4 allows the relay 7 to perform on-off operations according to the signal sent by the control signal input component 6 and the voltage zero-crossing signal state of the first input of the AC power live line and the second input of the AC power live line output by the isolated zero-crossing detection circuit 1; according to the phase-cutting angle parameter set by the control signal input component 6 and the voltage zero-crossing signal output by the isolated zero-crossing detection circuit 1, the corresponding control signal is output to the isolated drive phase-cutting circuit 5, and the DC positive half-cycle voltage output by the rectifier circuit 3 is phase-cut to realize dimming of the dimmer load.

[0040] When the relay 7 performs the on action, the two sets of contacts are energized, and the input terminal LO of the rectifier circuit 3 is connected to the live output terminal of the dimmer load, and the neutral input terminal of the AC power is connected to the neutral output terminal of the dimmer load, so that a working circuit is formed between the dimmer and the dimmer load; when the relay 7 performs the off action, the two sets of contacts are released, and the live output terminal of the dimmer load and the neutral output terminal of the load are completely disconnected from the dimmer circuit, and the dimmer load is safely isolated from the AC power.

[0041] The above embodiments are only used to illustrate the present invention. The structure, size, location and shape of each component may be changed. On the basis of the technical solution of the present invention, any improvement and equivalent transformation of individual components based on the principle of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A dimmer circuit using a relay to perform switching action, characterized in that include: An isolated zero-crossing detection circuit (1), a rectifier circuit (3), a control circuit (4), an isolated drive phase-cutting circuit (5), a control signal input component (6) and a relay (7); The isolated zero-crossing detection circuit (1) is used to detect the zero-crossing signals of the first input of the mains live wire and the second input of the mains live wire, and after safely isolating the zero-crossing signals, provide them to the control circuit (4) for use, so that the control circuit (4) and the control signal input component (6) are safely isolated from the mains; The rectifier circuit (3) rectifies the AC mains signal flowing through the dimmer load and the first input of the mains live wire or the second input of the mains live wire into a positive half-cycle DC signal, and provides it to the isolation drive phase cutting circuit (5) for phase cutting, thereby dimming the dimmer load; The control circuit (4) receives the control signal of the control signal input component (6) and the zero-crossing signal of the isolated zero-crossing detection circuit (1) to control the on and off of the relay (7); and the control circuit (4) outputs a phase-cutting angle control signal to the isolated drive phase-cutting circuit (5) to implement phase cutting of the DC positive half-cycle voltage output by the rectifier circuit (3) to implement load dimming; The isolation drive phase cutting circuit (5) isolates the phase cutting drive signal from the control circuit (4), and according to the input phase cutting signal, performs phase cutting on the DC positive half-cycle voltage output by the rectifier circuit (3), thereby performing a load dimming function; The control signal input component (6) is used to transmit the switching signal of the dimmer and the phase angle parameter of the phase-cut dimming to the control circuit (4); The relay (7) is a dimmer switch action actuator, which performs the on-off action between the dimmer and the load; when the dimmer is turned off, the relay (7) completely cuts off the connection between the dimmer and the load, so that the load is safely separated from the mains; The relay (7) is a double-pole single-throw relay, one set of contacts is respectively connected to the input end LO of the rectifier circuit (3) and the live wire output end of the dimmer load; the other set of contacts is respectively connected to the neutral wire input end of the mains power supply and the neutral wire output end of the dimmer load; the coil of the relay (7) is connected to the relay drive output end of the control circuit (4), and the on-off action of the relay (7) is controlled by the control circuit (4); When the relay (7) performs an on action, the two sets of contacts are attracted, and the input end LO of the rectifier circuit (3) is respectively connected to the live output end of the dimmer load, and the neutral input end of the mains is connected to the neutral output end of the dimmer load, so that a working circuit is formed between the dimmer and the dimmer load; when the relay (7) performs an off action, the two sets of contacts are released, and the live output end of the dimmer load and the neutral output end of the load are completely disconnected from the dimmer circuit, and the dimmer load is safely isolated from the mains.

2. The dimmer circuit according to claim 1, wherein: It also includes an isolated power supply (2), which provides a separate isolated working power supply for the control circuit (4) and the isolated drive phase-cutting circuit (5), so that the control circuit (4) and the control signal input component (6) are safely isolated from the mains.

3. The dimmer circuit according to claim 2, wherein: The first input end of the isolated power supply (2) is connected to the first input of the mains live wire, the second input end is connected to the second input of the mains live wire, and the third input end is connected to the mains input neutral wire input; the first isolated output power end of the isolated power supply (2) is connected to the control circuit (4) to provide an isolated and safe working power supply for the control circuit (4), and the second isolated output power end of the isolated power supply (2) is connected to the isolated drive phase cutting circuit (5) to provide a working power supply for the isolated drive phase cutting circuit (5).

4. The dimmer circuit as claimed in claim 3, characterized in that: The first input end of the isolated zero-crossing detection circuit (1) is connected to the first input of the mains live wire, and the second input end is connected to the second input of the mains live wire, and is used to detect voltage zero-crossing signals on the first input of the mains live wire and the second input of the mains live wire; the third input end N of the isolated zero-crossing detection circuit (1) is connected to the mains zero line input, and its two isolated voltage zero-crossing signal output ends are connected to the control circuit (4), and respectively provide the control circuit (4) with voltage zero-crossing signals of the first input of the mains live wire and the second input of the mains live wire.

5. The dimmer circuit according to any one of claims 1 to 4, characterized in that: The first input end of the rectifier circuit (3) is connected to the first input of the mains live wire, the second input end is connected to the second input of the mains live wire, and the third input end is connected to the live wire output end of the dimmer load through a group of contacts of the relay (7); the two output ends of the rectifier circuit (3) are connected to the isolated drive phase cutting circuit (5) to provide the isolated drive phase cutting circuit (5) with a rectified DC positive half-cycle voltage.

6. The dimmer circuit as claimed in claim 4, characterized in that: The control circuit (4) is respectively connected to the two isolated voltage zero-crossing signal output terminals of the isolated zero-crossing detection circuit (1), to the first isolated output power supply terminal of the isolated power supply (2), and to the output terminal of the control signal input component (6); the phase-cutting signal output terminal of the control circuit (4) is connected to the isolated drive phase-cutting circuit (5), and the relay drive output terminal of the control circuit (4) is connected to the relay (7).

7. The dimmer circuit according to claim 6, wherein: The isolated drive phase cutting circuit (5) uses a field effect transistor as a switching element to perform a phase cutting operation; the isolated drive phase cutting circuit (5) is respectively connected to the phase cutting drive signal output end of the control circuit (4), to the second isolated output power supply end of the isolated power supply (2), and to the two output ends of the rectifier circuit (3).

8. The dimmer circuit as claimed in claim 1, wherein: The output signal end of the control signal input component (6) is connected to the control circuit (4); the control signal input component (6) uses a button switch or a toggle switch to generate an on-off signal, and uses a coding potentiometer, a variable resistor potentiometer and a button switch to set the phase angle parameter.

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