CN110753427A - Dimmer circuit for executing switching action by adopting relay - Google Patents
Dimmer circuit for executing switching action by adopting relay Download PDFInfo
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- CN110753427A CN110753427A CN201810810656.8A CN201810810656A CN110753427A CN 110753427 A CN110753427 A CN 110753427A CN 201810810656 A CN201810810656 A CN 201810810656A CN 110753427 A CN110753427 A CN 110753427A
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Abstract
The invention relates to a dimmer circuit using a relay to execute switching action, comprising: the device comprises an isolation zero-crossing detection circuit, a rectification circuit, a control circuit, an isolation drive phase-cutting circuit, a control signal input component and a relay. The dimmer circuit uses the relay to replace a common single-pole single-throw switch to execute the on-off action of the dimmer, when the dimmer executes the closing operation, the relay is released to completely cut off two input lines of the load, so that the load is safely separated from the mains supply, and the potential safety hazard that when the existing dimmer adopts the single-pole single-throw switch to execute the closing operation, only one input line of the load is cut off, and the load cannot be completely separated from the mains supply is avoided; the dimmer simultaneously uses the isolated power supply, the isolated zero-crossing detection circuit and the isolated driving phase-cutting circuit, so that the control signal input part is safely isolated from the mains supply, and the operation safety of a user is ensured.
Description
Technical Field
The present invention relates to the field of lighting circuits, and more particularly to a dimmer circuit that uses a relay to perform a switching operation.
Background
The current switch control of the dimmer uses a single-pole single-throw switch. When the dimmer is in a turn-off state, only one connection line of the load of the dimmer is cut off, the other connection line is still connected with the mains supply, if the cut-off line is not a live line but a zero line, the load of the dimmer is still electrified when the dimmer is turned off, and if the dimmer is used for maintaining a line or replacing the load, the load has electric shock danger.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a dimmer circuit using a relay to perform a switching operation, which can effectively avoid a potential safety hazard existing when a path is connected to a mains supply during a turn-off operation, and can ensure the safety of a user.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dimmer circuit for performing a switching action using a relay, comprising: the isolation zero-crossing detection circuit comprises an isolation zero-crossing detection circuit, a rectification circuit, a control circuit, an isolation drive phase-cutting circuit, a control signal input component and a relay;
the isolation zero-crossing detection circuit is used for detecting zero-crossing signals of a first input of a live wire of a mains supply and a second input of the live wire of the mains supply, and providing the zero-crossing signals to the control circuit for use after the zero-crossing signals are safely isolated, so that the control circuit and the control signal input component are safely isolated from the mains supply;
the rectification circuit rectifies a first input of a live wire of mains supply or a second input of the live wire of mains supply and an alternating current mains supply signal flowing through a load of the dimmer into a direct current signal of a positive half cycle, and the direct current signal is provided for the isolation driving phase switching circuit to switch the phase, so that the load of the dimmer is dimmed;
the control circuit receives a control signal of the control signal input part and a zero-crossing signal of the isolation zero-crossing detection circuit and controls the on-off of the relay; the control circuit outputs a phase-cut angle control signal to the isolation driving phase-cut circuit to cut the phase of the direct-current positive half-cycle voltage output by the rectifying circuit and adjust the light of the load;
the isolation driving phase-cutting circuit isolates a phase-cutting driving signal from the control circuit, and performs phase cutting on direct-current positive half-cycle voltage output by the rectifying circuit according to the input phase-cutting signal to perform a function of dimming a load;
the control signal input component is used for transmitting a switching signal of a dimmer and a phase-cut angle parameter of phase-cut dimming to the control circuit;
the relay is a dimmer switch action execution device and executes on-off action between the dimmer and the load; when the dimmer is switched off, the relay completely cuts off the connection between the dimmer and the load, so that the load is safely separated from the mains supply.
The dimmer circuit according to the preceding embodiment, wherein: the isolation power supply provides independent isolated working power supplies for the control circuit and the isolation drive phase-cutting circuit respectively, so that the control circuit and the control signal input component are safely isolated from commercial power.
The dimmer circuit according to the preceding embodiment, wherein: the first input end of the isolation power supply is connected with a first input of a live wire of commercial power, the second input end of the isolation power supply is connected with a second input of the live wire of the commercial power, and the third input end of the isolation power supply is connected with a zero line input of the commercial power; the first isolation output power end of the isolation power supply is connected with the control circuit and provides a safe isolation working power supply for the control circuit, and the second isolation output power end of the isolation power supply is connected with the isolation drive phase-switching circuit and provides a working power supply for the isolation drive phase-switching circuit.
The dimmer circuit according to the preceding embodiment, wherein: the first input end of the isolation zero-crossing detection circuit is connected with a first input of a commercial power live wire, and the second input end of the isolation zero-crossing detection circuit is connected with a second input of the commercial power live wire and is used for detecting voltage zero-crossing signals on two input lines of the first input of the commercial power live wire and the second input of the commercial power live wire; and a third input end N of the isolation zero-crossing detection circuit is connected with the input of a commercial power zero line, and two isolation voltage zero-crossing signal output ends of the isolation zero-crossing detection circuit are connected to the control circuit and respectively provide voltage zero-crossing signals of a commercial power live line first input and a commercial power live line second input for the control circuit.
The dimmer circuit according to the preceding embodiment, wherein: the first input end of the rectifying circuit is connected with a first input of a live wire of a mains supply, the second input end of the rectifying circuit is connected with a second input of the live wire of the mains supply, and the third input end of the rectifying circuit is connected with the output end of a load live wire of the dimmer through a group of contacts of the relay; two output ends of the rectifying circuit are connected to the isolation driving phase-cut circuit, and rectified direct-current positive half-cycle voltage is provided for the isolation driving phase-cut circuit.
The dimmer circuit according to the preceding embodiment, wherein: the control circuit is respectively connected with two isolated voltage zero-crossing signal output ends of the isolated zero-crossing detection circuit, a first isolated output power supply end of the isolated power supply and an output end of the control signal input part; the phase-cut signal output end of the control circuit is connected with the isolation drive phase-cut circuit, and the relay drive output end of the control circuit is connected with the relay.
The dimmer circuit according to the preceding embodiment, wherein: the isolation driving phase-cutting circuit adopts a field effect tube as a switching element to perform phase-cutting operation; the isolation driving phase-cutting circuit is respectively connected with the phase-cutting driving signal output end of the control circuit, connected with the power supply end of a second isolation output power supply of the isolation power supply and connected with two output ends of the rectification circuit.
The dimmer circuit according to the preceding embodiment, wherein: the relay adopts a double-pole single-throw relay, and a group of contacts are respectively connected with the input end of the rectifying circuit and the output end of a load live wire of the dimmer; the other group of contacts are respectively connected with the input end of the mains supply zero line and the output end of the load zero line of the dimmer; and a coil of the relay is connected with a relay driving output end of the control circuit, and the on-off action of the relay is controlled by the control circuit.
The dimmer circuit according to the preceding embodiment, wherein: when the relay executes the on action, the two groups of contacts are attracted, the input end LO of the rectifying circuit is respectively connected with the output end of a load live wire of the light modulator, and the input end of a commercial power zero line is connected with the output end of a load zero line of the light modulator, so that a working loop is formed between the light modulator and a load of the light modulator; when the action of interruption is executed, the two groups of contacts are released, the output end of the load live wire of the light modulator and the output end of the load zero line are completely separated from the light modulator circuit, and the light modulator load is safely isolated from the mains supply.
The dimmer circuit according to the preceding embodiment, wherein: the output signal end of the control signal input component is connected with the control circuit; the control signal input component adopts a button switch or a toggle switch to generate on-off signals, and adopts a coding potentiometer, a variable resistance potentiometer and the button switch to set phase-cut angle parameters.
Due to the adoption of the technical scheme, the invention has the following advantages: the invention adopts the relay to replace a common single-pole single-throw switch to execute the on-off action of the dimmer; the isolation power supply, the isolation zero-cross detection circuit and the isolation driving phase-switching circuit are used, so that when the dimmer is in a turn-off state, the load is safely separated from the mains supply, the situation that the existing dimmer adopts a single-pole single-throw switch and has potential safety hazards existing in connection with the mains supply when the existing dimmer is turned off is avoided, meanwhile, the control signal input component is safely isolated from the mains supply, and the safety of a user is guaranteed.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1, the present invention provides a dimmer circuit using a relay to perform a switching operation, which includes an isolated zero-cross detection circuit 1, an isolated power supply 2, a rectification circuit 3, a control circuit 4, an isolated driving phase-cut circuit 5, a control signal input part 6, and a relay 7. Wherein:
the isolation zero-crossing detection circuit 1 is used for detecting zero-crossing signals of a first input of a live wire of a mains supply and a second input of the live wire of the mains supply, and providing the zero-crossing signals for the control circuit 4 to use after the zero-crossing signals are safely isolated, so that the control circuit 4 and the control signal input part 6 are safely isolated from the mains supply.
The isolation power supply 2 provides independent isolated working power supply for the control circuit 4 and the isolation driving phase-cutting circuit 5 respectively, so that the control circuit 4 and the control signal input part 6 are safely isolated from commercial power.
The rectification circuit 3 rectifies the first input of the live wire of the mains supply or the second input of the live wire of the mains supply and the alternating-current mains supply signal flowing through the load of the dimmer into a direct-current signal of a positive half cycle, and the direct-current signal is provided for the isolation driving phase-cut circuit 5 to be subjected to phase cutting, so that the load of the dimmer is dimmed; when the isolation drive phase-cut circuit 5 is closed, the rectification circuit 3 isolates the first input of the live wire of the mains supply and the second input of the live wire of the mains supply, so that the isolation zero-crossing detection circuit 1 can detect the independent voltage zero-crossing signals of the first input of the live wire of the mains supply and the second input of the live wire of the mains supply respectively.
The control circuit 4 receives a control signal of the control signal input part 6 and a zero-crossing signal of the isolation zero-crossing detection circuit 1 to control the on-off of the relay 7; and the control circuit 4 outputs a phase-cutting angle control signal to the isolated driving phase-cutting circuit 5, so that the phase cutting of the direct-current positive half-cycle voltage output by the rectifying circuit 3 is realized, and the dimming of the load is realized.
The isolation drive phase-cut circuit 5 isolates the phase-cut drive signal from the control circuit 4, and performs a function of dimming the load by phase-cutting the direct-current positive half-cycle voltage output from the rectifying circuit 3 according to the input phase-cut signal.
The control signal input part 6 is used for transmitting a switching signal of the dimmer and a phase-cut angle parameter of the phase-cut dimming to the control circuit 4.
The relay 7 is a dimmer switch action execution device and executes on-off action between a dimmer and a 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 supply.
In a preferred embodiment, the first input end L1 of the isolation zero-crossing detection circuit 1 is connected to the first input of the commercial power line, and the second input end L2 is connected to the second input of the commercial power line, for detecting the voltage zero-crossing signal on the two input lines of the first input of the commercial power line and the second input of the commercial power line; the third input end N of the isolation zero-crossing detection circuit 1 is connected with the mains zero line input, two isolation voltage zero-crossing signal output ends DT1 and DT2 of the isolation zero-crossing detection circuit 1 are connected to the control circuit 4, and voltage zero-crossing signals of the first input of the mains live wire and the second input of the mains live wire are respectively provided for the control circuit 4, so that the control circuit 4 and the control signal input part 6 are completely isolated from the mains.
In a preferred embodiment, the first input end L1 of the isolated power supply 2 is connected to the first input of the live line of the mains, the second input end L2 is connected to the second input of the live line of the mains, and the third input end N is connected to the input neutral line of the mains, so as to ensure that an isolated safe power supply can be output no matter the mains is connected to the mains from the first input of the live line of the mains or the second input of the live line of the mains; the first isolation output power supply end V1+ of the isolation power supply 2 is connected with the control circuit 4 to provide an isolation safe working power supply for the control circuit 4, so that the control circuit 4 and the control signal input part 6 are safely isolated from the mains supply, and the operation safety of a user is ensured; and a second isolation output power supply end V2+ of the isolation power supply 2 is connected with the isolation drive phase-cut circuit 5 to provide a working power supply for the isolation drive phase-cut circuit 5.
In a preferred embodiment, the first input L1 of the rectifying circuit 3 is connected to the first input of the live mains, the second input L2 is connected to the second input of the live mains, and the third input LO is connected to the live dimmer load output via a set of contacts of the relay 7; two output ends LC and LG of the rectification circuit 3 are connected to the isolation drive phase-cut circuit 5, and rectified direct-current positive half-cycle voltage is provided for the isolation drive phase-cut circuit 5; when the isolation drive phase-cut circuit 5 is closed, the rectification circuit 3 isolates the first input of the live wire of the mains supply and the second input of the live wire of the mains supply, so that the isolation zero-crossing detection circuit 1 can detect the independent voltage zero-crossing signals of the first input of the live wire of the mains supply and the second input of the live wire of the mains supply respectively.
In a preferred embodiment, the control circuit 4 is connected to the two isolated voltage zero-crossing signal output terminals DT1 and DT2 of the isolated zero-crossing detection circuit 1, to the first isolated output power supply terminal V1+ of the isolated power supply 2, and to the output terminal SN of the control signal input means 6, respectively; the phase-cut signal output end DR of the control circuit 4 is connected with the isolation driving phase-cut circuit 5, and the relay driving output end RL of the control circuit 4 is connected with the relay 7. The control circuit 4 controls the relay 7 to execute on-off operation 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 supply live wire and the second input of the mains supply live wire output by the isolation zero-crossing detection circuit 1; according to the phase cutting angle parameter set by the control signal input part 6 and the voltage zero-crossing signal output by the isolation zero-crossing detection circuit 1, a corresponding control signal is output to the isolation driving phase cutting circuit 5, and the direct-current positive half-cycle voltage output by the rectifying circuit 3 is subjected to phase cutting operation, so that the dimming of the load of the dimmer is realized.
In a preferred embodiment, the isolated driving phase-cutting circuit 5 adopts a field effect transistor as a switching element to perform the phase-cutting operation. The isolated driving phase-cutting circuit 5 is respectively connected with the phase-cutting driving signal output end DR of the control circuit 4, the second isolated output power supply end V2+ of the isolated power supply 2, and the two output ends LC and LG of the rectification circuit 3. After the isolation driving phase-cutting circuit 5 isolates the phase-cutting control signal from the control circuit 4, the field effect tube is driven to cut the phase of the direct-current positive half-cycle voltage output by the rectifying circuit 3, so as to realize dimming of the load of the dimmer.
In a preferred embodiment, the control signal input unit 6 has an output signal terminal SN connected to the control circuit 4; the control signal input part 6 adopts a button switch or a toggle switch to generate on-off signals, and adopts a coding potentiometer, a variable resistance potentiometer and the button switch to set phase-cut angle parameters.
In a preferred embodiment, the relay 7 is a double-pole single-throw relay, and one set of contacts is respectively connected with the input end LO of the rectifying circuit 3 and the live wire output end of the dimmer load; and the other group of contacts are respectively connected with the input end of the mains supply zero line and the output end of the load zero line of the dimmer. The coil of the relay 7 is connected with the relay driving output end 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 executes the on action, the two groups of contacts are closed, the input end LO of the rectifying circuit 3 is respectively connected with the output end of a load live wire of the light modulator, the input end of a commercial power zero line is connected with the output end of a load zero line of the light modulator, and a working loop is formed between the light modulator and the load of the light modulator; when the action of interruption is executed, the two groups of contacts are released, the output end of the load live wire of the light modulator and the output end of the load zero line are completely separated from the light modulator circuit, and the light modulator load is safely isolated from the mains supply.
In summary, when the present invention is used, the circuit work flow is as follows: the control circuit 4 enables the relay 7 to execute on-off operation according to the signal sent by the control signal input component 6 and the voltage zero-crossing signal states of the first input of the mains supply live wire and the second input of the mains supply live wire output by the isolation zero-crossing detection circuit 1; according to the phase cutting angle parameter set by the control signal input part 6 and the voltage zero-crossing signal output by the isolation zero-crossing detection circuit 1, a corresponding control signal is output to the isolation driving phase cutting circuit 5, and the phase cutting operation is carried out on the direct-current positive half-cycle voltage output by the rectifying circuit 3, so that the dimming of the load of the dimmer is realized.
When the relay 7 executes the on action, the two groups of contacts are attracted to respectively: an input end LO of the rectification circuit 3 is connected with an output end of a load live wire of the light modulator, and an input end of a commercial power zero line is connected with an output end of a load zero line of the light modulator, so that a working loop is formed between the light modulator and a load of the light modulator; when the action of interruption is executed, the two groups of contacts are released, the output end of the load live wire of the light modulator and the output end of the load zero line are completely separated from the light modulator circuit, and the light modulator load is safely isolated from the mains supply.
The above embodiments are only for illustrating the present invention, and the structure, size, arrangement position and shape of each component can be changed, and on the basis of the technical scheme of the present invention, the improvement and equivalent transformation of the individual components according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (10)
1. A dimmer circuit for performing a switching action using a relay, comprising: the device comprises an isolation zero-crossing detection circuit (1), a rectification circuit (3), a control circuit (4), an isolation driving phase-cutting circuit (5), a control signal input component (6) and a relay (7);
the isolation zero-crossing detection circuit (1) is used for detecting zero-crossing signals of a first input of a live wire of a mains supply and a second input of the live wire of the mains supply, and providing the zero-crossing signals to the control circuit (4) for use after the zero-crossing signals are safely isolated, so that the control circuit (4) and the control signal input part (6) are safely isolated from the mains supply;
the rectification circuit (3) rectifies a first input of a live wire of a mains supply or a second input of the live wire of the mains supply and an alternating-current mains supply signal flowing through a load of the dimmer into a direct-current signal of a positive half cycle, and the direct-current signal is provided for the isolation driving phase switching circuit (5) to be subjected to phase switching, so that the load of the dimmer is dimmed;
the control circuit (4) receives a control signal of the control signal input component (6) and a zero-crossing signal of the isolation zero-crossing detection circuit (1) to control the on-off of the relay (7); the control circuit (4) outputs a phase-cut angle control signal to the isolation driving phase-cut circuit (5) to cut the phase of the direct-current positive half-cycle voltage output by the rectifying circuit (3) and adjust the light of the load;
the isolation driving phase-cut circuit (5) isolates a phase-cut driving signal from the control circuit (4), and performs phase-cut on a direct-current positive half-cycle voltage output by the rectifying circuit (3) according to the input phase-cut signal to perform a function of dimming a load;
the control signal input component (6) is used for transmitting a switching signal of a dimmer and a phase-cut angle parameter of phase-cut dimming to the control circuit (4);
the relay (7) is a dimmer switch action execution device and executes on-off action between a dimmer and a load; when the dimmer is switched 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 supply.
2. The dimmer circuit of claim 1, wherein: still including keeping apart power supply (2), keep apart power supply (2) and provide the working power supply of independent isolation for control circuit (4) and isolation drive phase-cutting circuit (5) respectively, make control circuit (4) and control signal input part (6) keep apart with commercial power safety.
3. The dimmer circuit of claim 2, wherein: the first input end of the isolation power supply (2) is connected with the first input of the live wire of the commercial power, the second input end of the isolation power supply is connected with the second input of the live wire of the commercial power, and the third input end of the isolation power supply is connected with the input of the zero line of the commercial power; the first isolation output power end of the isolation power supply (2) is connected with the control circuit (4) and provides a safe isolation working power supply for the control circuit (4), and the second isolation output power end of the isolation power supply (2) is connected with the isolation drive phase-cut circuit (5) and provides a working power supply for the isolation drive phase-cut circuit (5).
4. A dimmer circuit as claimed in claim 3, wherein: the first input end of the isolation zero-crossing detection circuit (1) is connected with a first input of a mains supply live wire, and the second input end of the isolation zero-crossing detection circuit is connected with a second input of the mains supply live wire and is used for detecting voltage zero-crossing signals on two input lines of the first input of the mains supply live wire and the second input of the mains supply live wire; and a third input end N of the isolation zero-crossing detection circuit (1) is connected with the input of a mains supply zero line, and two isolation voltage zero-crossing signal output ends of the isolation zero-crossing detection circuit are connected to the control circuit (4) and respectively provide a voltage zero-crossing signal of a first input of a mains supply live wire and a second input of the mains supply live wire for the control circuit (4).
5. The dimmer circuit of any one of claims 1-4, wherein: the first input end of the rectifying circuit (3) is connected with a first input of a live wire of a mains supply, the second input end of the rectifying circuit is connected with a second input of the live wire of the mains supply, and the third input end of the rectifying circuit is connected with the output end of a load live wire of the dimmer through a group of contacts of the relay (7); two output ends of the rectifying circuit (3) are connected to the isolation driving phase-cut circuit (5) and provide rectified direct-current positive half-cycle voltage for the isolation driving phase-cut circuit (5).
6. The dimmer circuit of claim 4, wherein: the control circuit (4) is respectively connected with two isolated voltage zero-crossing signal output ends of the isolated zero-crossing detection circuit (1), a first isolated output power supply end of the isolated power supply (2) and an output end of the control signal input part (6); the phase-cut signal output end of the control circuit (4) is connected with the isolation drive phase-cut circuit (5), and the relay drive output end of the control circuit (4) is connected with the relay (7).
7. The dimmer circuit of claim 6, wherein: the isolation driving phase-cutting circuit (5) adopts a field effect transistor as a switching element to perform phase-cutting operation; the isolation driving phase-cutting circuit (5) is respectively connected with the phase-cutting driving signal output end of the control circuit (4), connected with the second isolation output power supply end of the isolation power supply (2) and connected with two output ends of the rectification circuit (3).
8. The dimmer circuit of claim 6, wherein: the relay (7) adopts a double-pole single-throw relay, and a group of contacts are respectively connected with the input end of the rectifying circuit (3) and the output end of a load live wire of the dimmer; the other group of contacts are respectively connected with the input end of the mains supply zero line and the output end of the load zero line of the dimmer; and a coil of the relay (7) is connected with a relay driving output end of the control circuit (4), and the on-off action of the relay (7) is controlled by the control circuit (4).
9. The dimmer circuit of claim 8, wherein: when the relay (7) executes the on action, two groups of contacts are attracted, the input end LO of the rectifying circuit (3) is respectively connected with the output end of a load live wire of the dimmer, the input end of a commercial power zero line is connected with the output end of a load zero line of the dimmer, and a working loop is formed between the dimmer and the load of the dimmer; when the action of interruption is executed, the two groups of contacts are released, the output end of the load live wire of the light modulator and the output end of the load zero line are completely separated from the light modulator circuit, and the light modulator load is safely isolated from the mains supply.
10. The dimmer circuit of claim 1, wherein: the output signal end of the control signal input component (6) is connected with the control circuit (4); the control signal input part (6) adopts a button switch or a toggle switch to generate on-off signals, and adopts a coding potentiometer, a variable resistance potentiometer and the button switch to set phase-cut angle parameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810656.8A CN110753427A (en) | 2018-07-23 | 2018-07-23 | Dimmer circuit for executing switching action by adopting relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810656.8A CN110753427A (en) | 2018-07-23 | 2018-07-23 | Dimmer circuit for executing switching action by adopting relay |
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| Publication Number | Publication Date |
|---|---|
| CN110753427A true CN110753427A (en) | 2020-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810810656.8A Pending CN110753427A (en) | 2018-07-23 | 2018-07-23 | Dimmer circuit for executing switching action by adopting relay |
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| Country | Link |
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| CN (1) | CN110753427A (en) |
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2018
- 2018-07-23 CN CN201810810656.8A patent/CN110753427A/en active Pending
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