CN210518253U - Control circuit of single live wire wireless switch - Google Patents
Control circuit of single live wire wireless switch Download PDFInfo
- Publication number
- CN210518253U CN210518253U CN201921895307.7U CN201921895307U CN210518253U CN 210518253 U CN210518253 U CN 210518253U CN 201921895307 U CN201921895307 U CN 201921895307U CN 210518253 U CN210518253 U CN 210518253U
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Abstract
The utility model discloses a control circuit of a single live wire wireless switch, which comprises a power supply circuit, a voltage limiting circuit connected with the power supply circuit and a switch circuit connected with the power supply circuit; the voltage limiting circuit comprises a sampling circuit and a comparison circuit connected with the sampling circuit, and the sampling circuit is connected with the power supply circuit to obtain the voltage of the power supply circuit; the comparison circuit comprises a comparison chip and a reference circuit, wherein the reference circuit is connected with the inverting input end of the comparison chip to provide reference voltage, the non-inverting input end of the comparison chip is connected with the sampling circuit to obtain the voltage of the power supply circuit, the output end of the comparison chip is connected with the voltage limiting circuit, and the voltage limiting circuit receives the comparison signal output by the comparison chip and executes corresponding switching action to adjust the output voltage. The utility model discloses can improve the stability of the on-off element control in the switch.
Description
Technical Field
The utility model relates to a wall switch technical field specifically is a control circuit of single live wire wireless switch.
Background
With the development of smart homes, more and more wall sockets or switches also enter into smart internet of things, in order to realize smart switching, a switching element capable of being controlled by a controller is necessarily arranged, but the stability of the control of the switching element is a key factor, and if the control of the switching element is unstable, the corresponding external equipment may be damaged.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a control circuit of single live wire wireless switch can improve the stability of the switching element control in the switch.
In order to achieve the above purpose, the utility model provides a following technical scheme: a control circuit of a single-live-wire wireless switch comprises a power supply circuit, a voltage limiting circuit connected with the power supply circuit and a switch circuit connected with the power supply circuit; the voltage limiting circuit comprises a sampling circuit and a comparison circuit connected with the sampling circuit, and the sampling circuit is connected with the power supply circuit to obtain the voltage of the power supply circuit; the comparison circuit comprises a comparison chip and a reference circuit, the reference circuit is connected with the inverting input end of the comparison chip to provide reference voltage, the non-inverting input end of the comparison chip is connected with the sampling circuit to obtain the voltage of the power supply circuit, the output end of the comparison chip is connected with the voltage limiting circuit, and the voltage limiting circuit receives the comparison signal output by the comparison chip and executes corresponding switching action to adjust the output voltage.
As the utility model discloses a further improvement, voltage limiting circuit includes live wire terminal and MOS pipe Q1, MOS pipe Q1's source electrode and live wire terminal connection, the grid is connected with the output of comparing the chip, and drain electrode output power supply gives supply circuit.
As a further improvement of the utility model, the supply circuit includes diode D1 and zener diode D6, diode D1's positive pole is connected to MOS pipe Q1's drain electrode, and the negative pole is connected with ground connection behind an electric capacity C3, still is connected to zener diode D6's negative pole, zener diode D6's positive pole is connected with ground connection behind an electric capacity C4, the normal phase input of comparing the chip is connected to zener diode D6 and electric capacity C4 interconnect's node to sampling voltage.
As a further improvement of the present invention, the reference circuit includes a triode Q2, the base of triode Q2 is connected to the output end of the comparison chip through a resistor R3, the emitter of triode Q2 is grounded, and the collector is connected in series with the internal power supply of the rear connection plate of resistor R7 and resistor R5 in turn, the node of the mutual connection of resistor R7 and resistor R5 is connected with the inverting input end of the comparison chip to provide the reference voltage.
As a further improvement of the present invention, the switch circuit includes a relay K1 and a load wiring unit, the contact of the relay K1 is connected to the drain of the MOS transistor Q1, and the contact thereof is connected to the load wiring unit; one end of a coil of the relay K1 is connected to the negative electrode of the voltage stabilizing diode D6 to obtain a power supply, and the other end of the coil is connected to an external controller to receive a control signal; a diode D7 is also connected in parallel to the two ends of the coil, the cathode of the diode D7 is connected to the end of the coil opposite to the zener diode D6, and the anode is connected to the end of the coil opposite to the external controller.
As a further improvement of the present invention, the power supply circuit further includes a diode D2 and a diode D3, the anode of the diode D2 is connected to the cathode of the zener diode D6, the cathode is connected to the anode of the diode D3, and the cathode of the diode D3 is connected to the coil of the cathode output relay K1 coil relative to the diode D6 to provide a coil power supply.
As a further improvement of the utility model, still include the electric energy recovery circuit, the electric energy recovery circuit includes diode D13 and diode D10, the node that diode D2 and diode D3 are connected is connected to diode D13's positive pole, diode D13's negative pole is connected to external power source module, diode D10's positive pole is connected to load wiring unit, and the negative pole is connected to external power source module.
As a further improvement of the present invention, the cathode of the diode D3 is further connected to a zener diode D5 and then grounded.
As a further improvement of the present invention, the switch circuit further includes an optocoupler U2 and a battery, an anode of a light emitting diode in the optocoupler U2 is connected to a node where the diode D1 is connected to the diode D2, and a cathode thereof is grounded; the input end of a photosensitive switch in the optocoupler U2 is connected to the battery, the output end of the photosensitive switch is connected with the external controller, and when the photosensitive switch is switched on, the battery outputs power to the external controller.
The utility model has the advantages that the reference circuit provides reference voltage for the comparison chip, which is convenient for the comparison chip to execute comparison action, the voltage output by the power supply circuit received by the positive phase input end of the comparison chip is matched for comparison, when the voltage received by the positive phase input end exceeds the reference voltage, the comparison chip outputs high level signals, when the voltage limiting circuit receives the high level signals, the action of reducing the level is executed, when the voltage limiting circuit controls the power supply circuit to pause outputting power, simultaneously, the positive phase input end of the comparison chip continuously acquires the level change output by the power supply circuit through the sampling circuit, once the level acquired by the positive phase input end of the comparison chip is lower than the voltage value of the reference voltage, when the comparison chip controls the power supply circuit to output power through the voltage limiting circuit again, the operation is repeated, the voltage value of the working voltage output by the power supply circuit to the switch, so as to ensure that the switching circuit is within a normal operating voltage range, thereby improving the stability of the switching circuit in the switch.
Drawings
Fig. 1 is a schematic diagram of the overall circuit structure of the present invention;
fig. 2 is a schematic diagram of the structure of the power supply circuit of the present invention;
fig. 3 is a schematic diagram of the switch circuit structure of the present invention.
Reference numerals: 1. a power supply circuit; 2. a voltage limiting circuit; 3. a switching circuit; 4. a sampling circuit; 5. a comparison circuit; 6. comparing the chips; 7. a reference circuit; 8. a live wire binding post; 9. a load wiring unit; 10. a battery; 11. electric energy recovery circuit.
Detailed Description
The present invention will be described in further detail with reference to embodiments shown in the drawings.
Referring to fig. 1-3, a control circuit of a single-live-wire wireless switch of the present embodiment includes a power supply circuit 1, a voltage limiting circuit 2 connected to the power supply circuit 1, and a switch circuit 3 connected to the power supply circuit 1; the voltage limiting circuit 2 comprises a sampling circuit 4 and a comparison circuit 5 connected with the sampling circuit 4, and the sampling circuit 4 is connected with the power supply circuit 1 to obtain the voltage of the power supply circuit 1; the comparison circuit 5 comprises a comparison chip 6 and a reference circuit 7, the reference circuit 7 is connected with the inverting input end of the comparison chip 6 to provide a reference voltage, the non-inverting input end of the comparison chip 6 is connected with the sampling circuit 4 to obtain the voltage of the power supply circuit 1, the output end of the comparison chip 6 is connected with the voltage limiting circuit 2, and the voltage limiting circuit 2 receives the comparison signal output by the comparison chip 6 and executes corresponding switching action to adjust the output voltage.
Firstly, the reference circuit 7 provides a reference voltage to the comparison chip 6, so that the comparison chip 6 can conveniently execute comparison action, and perform comparison in coordination with the voltage output by the power supply circuit 1 received by the positive phase input end of the comparison chip 6, at this time, when the voltage received by the positive phase input end exceeds the reference voltage, the comparison chip 6 outputs a high level signal, at this time, the voltage limiting circuit 2 executes level reduction action when receiving the high level signal, at this time, the voltage limiting circuit 2 controls the power supply circuit 1 to suspend outputting the power supply, at the same time, the positive phase input end of the comparison chip 6 continuously obtains the level change output by the power supply circuit 1 through the sampling circuit 4, once the level obtained by the positive phase input end of the comparison chip 6 is lower than the voltage value of the reference voltage, at this time, the comparison chip 6 controls the power supply circuit 1 to output the power supply through the voltage limiting circuit 2 again, and, to ensure that the switching circuit 3 is within the normal operating voltage range, whereby the stability of the switching circuit 3 in the switch can be improved.
Specifically, the sampling circuit 4 performs sampling through the resistor R6 in fig. 1 and 2.
As a modified specific implementation mode, the voltage limiting circuit 2 comprises a live wire terminal 8 and a MOS tube Q1, wherein the source of the MOS tube Q1 is connected with the live wire terminal 8, the gate is connected with the output end of the comparison chip 6, and the drain outputs power to the power supply circuit 1.
Firstly, the live wire binding post 8 is used for connecting the live wire of the commercial power, and in addition, the MOS tube Q1 is used for controlling the on-off, thereby playing a role in limiting the voltage, so as to achieve the effect that the voltage output by the power supply circuit 1 is maintained at a certain level. In the specific scheme of fig. 1, the present embodiment is limited to about 12V, which facilitates the normal operation of the switch circuit 3.
In a further arrangement, the power supply circuit 1 includes a diode D1 and a zener diode D6, an anode of the diode D1 is connected to the drain of the MOS transistor Q1, a cathode of the diode D1 is connected to a capacitor C3 and then to ground, and is also connected to a cathode of the zener diode D6, an anode of the zener diode D6 is connected to a capacitor C4 and then to ground, and a non-inverting input terminal of the comparison chip 6 is connected to a node where the zener diode D6 and the capacitor C4 are connected to sample the voltage.
In addition, the switch circuit 3 further comprises an optocoupler U2 and a battery 10, wherein the anode of a light emitting diode in the optocoupler U2 is connected to the node where the diode D1 is connected with the diode D2, and the cathode of the optocoupler U2 is grounded; the input end of a photosensitive switch in the optocoupler U2 is connected to the battery 10, the output end of the photosensitive switch is connected with an external controller, and when the photosensitive switch is switched on, the battery 10 outputs power to the external controller.
The live line of the mains supply is first rectified by diode D1, then stepped down by zener diode D6, and also coupled to ground by capacitor C4, which provides a filtering action. Carry out the power after stepping down through zener diode D6 and can regard as the power input to opto-coupler U2 in, this circuit structure is simple, and is with low costs, and can directly acquire mains supply through this circuit, in specific circuit design, can directly supply power through this last signal of telecommunication of battery 103 cooperation, the uninterrupted power supply of having avoided battery 103 leads to the electric quantity to consume soon, in addition, in specific use, can directly cancel extra power supply even, directly supply power as the main power supply through battery 103, just can build the power supply of energy-conserving through simple circuit structure and cost this moment.
Secondly, the positive phase input end of the comparison chip 6 is connected to the positive pole of the voltage regulator diode D6, and at this time, the voltage of the power rectified by the diode D1 is reduced and divided by the voltage regulator diode D6, so that the voltage value transmitted to the positive phase input end of the comparison chip 6 is relatively small, and the comparison chip 6 can be protected.
The battery 10 supplements the current in the circuit to make the circuit work normally, and it mainly supplies power to the external controller to make it get enough current and voltage to work normally. In addition, when the power supply needs to supply power to a plurality of circuits, each circuit distributes current, so that the current on each circuit is insufficient, the problem can be solved by additionally supplying power by the battery 10, and the battery 10 is used as a supplementary power supply instead of a main power supply, so that the delayed service life can be prolonged.
Preferably, the reference circuit 7 comprises a transistor Q2, a base of the transistor Q2 is connected to an output terminal of the comparison chip 6 through a resistor R3, an emitter of the transistor Q2 is grounded, a collector of the transistor Q2 is sequentially connected in series with a resistor R7 and a resistor R5 to be connected with an internal power supply, and a node where the resistor R7 and the resistor R5 are connected with each other is connected with an inverted input terminal of the comparison chip 6 to provide a reference voltage.
When the comparison chip 6 outputs a high level, the base of the triode Q2 also receives the high level, and the triode is turned on, so that the inverting input terminal of the comparison chip 6 obtains a reference voltage after being divided by the resistor R7 and the resistor R5, and the comparison chip 6 enters a normal comparison working state at this time, and through a series of circuit working modes of automatic power-on, the power saving of the battery 10 can be further ensured, and the service life of the battery 10 is prolonged.
Preferably, the switch circuit 3 comprises a relay K1 and a load wiring unit 9, a contact of the relay K1 is connected to the drain of the MOS transistor Q1, and a contact thereof is connected to the load wiring unit 9; one end of a coil of the relay K1 is connected to the negative electrode of the voltage stabilizing diode D6 to obtain a power supply, and the other end of the coil is connected to an external controller to receive a control signal; the two ends of the coil are also connected in parallel with a diode D7, the cathode of the diode D7 is connected to one end of the coil opposite to the voltage stabilizing diode D6, and the anode of the diode is connected to one end of the coil opposite to the external controller.
For example, in this embodiment, as can be seen in fig. 1, three collectors are used to perform a switching operation, and a plurality of loads can be simultaneously turned on and off. When the relay is engaged under the control of the controller, the mains supply supplies power to the load through the contacts and the load wiring unit 9. The diode D7 is used as a freewheeling diode to protect the coil, and the service life of the relay is prolonged.
As a modified specific embodiment, the power supply circuit 1 further includes a diode D2 and a diode D3, the anode of the diode D2 is connected to the cathode of the zener diode D6, the cathode is connected to the anode of the diode D3, and the cathode of the diode D3 is connected to the coil of the output relay K1 opposite to the end of the diode D6 to provide a coil power supply.
The power supplies of the two tags of RELAY _ PRE and RELAY in FIG. 1 can be isolated by the diode D2 and the diode D3, so that the tags can work better and normally.
The following description is continued with further improvement, and the power recovery circuit 11 is further included, where the power recovery circuit 11 includes a diode D13 and a diode D10, a node where the diode D2 and the diode D3 are connected is connected to an anode of the diode D13, a cathode of the diode D13 is connected to the external power module, an anode of the diode D10 is connected to the load wiring unit 9, and a cathode of the diode D10 is connected to the external power module.
The power supply at the position of the RELAY _ PRE label is fed back to the power supply module through the diode D13, in addition, the power supply at the position of the load wiring unit 9 is recovered through the diode D10 and fed back to the power supply module, the power supply module performs rectification, filtering, voltage stabilization and feeds back to other circuits for power supply through the two fed back power supplies, and the power supply module can fully utilize the power supply to supply power to other circuits, for example, the adjacent voltage level requires lower loads.
Furthermore, the cathode of the diode D3 is connected to a zener diode D5 and then grounded.
Through the technical scheme, the voltage limiting and stabilizing can be further carried out on the power supply of the coil of the relay through the voltage stabilizing diode D5, and the working stability of the relay is further improved.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A control circuit of a single-live-wire wireless switch is characterized by comprising a power supply circuit (1), a voltage limiting circuit (2) connected with the power supply circuit (1), and a switch circuit (3) connected with the power supply circuit (1); the voltage limiting circuit (2) comprises a sampling circuit (4) and a comparison circuit (5) connected with the sampling circuit (4), and the sampling circuit (4) is connected with the power supply circuit (1) to obtain the voltage of the power supply circuit (1); the comparison circuit (5) comprises a comparison chip (6) and a reference circuit (7), the reference circuit (7) is connected with the inverting input end of the comparison chip (6) to provide a reference voltage, the non-inverting input end of the comparison chip (6) is connected with the sampling circuit (4) to obtain the voltage of the power supply circuit (1), the output end of the comparison chip (6) is connected with the voltage limiting circuit (2), and the voltage limiting circuit (2) receives the comparison signal output by the comparison chip (6) and executes corresponding switching action to adjust the output voltage.
2. The control circuit of the single live wire wireless switch of claim 1, wherein the voltage limiting circuit (2) comprises a live wire terminal (8) and a MOS (metal oxide semiconductor) tube Q1, the source of the MOS tube Q1 is connected with the live wire terminal (8), the gate of the MOS tube Q1 is connected with the output end of the comparison chip (6), and the drain of the MOS tube Q1 outputs power to the power supply circuit (1).
3. The control circuit of the single-live wire wireless switch of claim 2, wherein the power supply circuit (1) comprises a diode D1 and a zener diode D6, the anode of the diode D1 is connected to the drain of the MOS transistor Q1, the cathode of the diode D1 is connected to a capacitor C3 and then grounded, and is further connected to the cathode of a zener diode D6, the anode of the zener diode D6 is connected to a capacitor C4 and then grounded, and the non-inverting input terminal of the comparison chip (6) is connected to the node where the zener diode D6 and the capacitor C4 are connected to sample the voltage.
4. The control circuit of the single-live wire wireless switch of claim 3, wherein the reference circuit (7) comprises a transistor Q2, the base of the transistor Q2 is connected to the output end of the comparison chip (6) through a resistor R3, the emitter of the transistor Q2 is grounded, the collector is sequentially connected in series with a resistor R7 and a resistor R5, the internal power supply is connected to the rear end of the transistor Q2, and the node where the resistor R7 and the resistor R5 are connected with each other is connected with the inverting input end of the comparison chip (6) to provide the reference voltage.
5. The control circuit of the single live wire wireless switch according to claim 4, wherein the switch circuit (3) comprises a relay K1 and a load wiring unit (9), the contact of the relay K1 is connected to the drain of MOS transistor Q1, and the contact thereof is connected to the load wiring unit (9); one end of a coil of the relay K1 is connected to the negative electrode of the voltage stabilizing diode D6 to obtain a power supply, and the other end of the coil is connected to an external controller to receive a control signal; a diode D7 is also connected in parallel to the two ends of the coil, the cathode of the diode D7 is connected to the end of the coil opposite to the zener diode D6, and the anode is connected to the end of the coil opposite to the external controller.
6. The control circuit of the single live wire wireless switch according to claim 5, wherein the power supply circuit (1) further comprises a diode D2 and a diode D3, the anode of the diode D2 is connected to the cathode of the zener diode D6, the cathode of the diode D3, and the cathode of the diode D3 is connected to the coil of the output relay K1 opposite to the end of the diode D6 to provide a coil power supply.
7. The control circuit of the single live wire wireless switch as claimed in claim 6, further comprising a power recovery circuit (11), wherein the power recovery circuit (11) comprises a diode D13 and a diode D10, the junction of the diode D2 and the diode D3 is connected to the anode of the diode D13, the cathode of the diode D13 is connected to an external power module, the anode of the diode D10 is connected to the load wiring unit (9), and the cathode is connected to the external power module.
8. The control circuit of the single live wire wireless switch as claimed in claim 7, wherein the cathode of the diode D3 is further connected to a zener diode D5 and then grounded.
9. The control circuit of the single live wire wireless switch of claim 8, wherein the switch circuit (3) further comprises an optocoupler U2 and a battery (10), wherein an anode of a light emitting diode in the optocoupler U2 is connected to a node where the diode D1 is connected to the diode D2, and a cathode thereof is grounded; the input end of a photosensitive switch in the optocoupler U2 is connected to the battery (10), the output end of the photosensitive switch is connected with an external controller, and when the photosensitive switch is switched on, the battery (10) outputs power to the external controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921895307.7U CN210518253U (en) | 2019-11-05 | 2019-11-05 | Control circuit of single live wire wireless switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921895307.7U CN210518253U (en) | 2019-11-05 | 2019-11-05 | Control circuit of single live wire wireless switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210518253U true CN210518253U (en) | 2020-05-12 |
Family
ID=70574200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921895307.7U Expired - Fee Related CN210518253U (en) | 2019-11-05 | 2019-11-05 | Control circuit of single live wire wireless switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210518253U (en) |
-
2019
- 2019-11-05 CN CN201921895307.7U patent/CN210518253U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200512 Termination date: 20211105 |