CN210075604U - Switch control circuit and foot tub - Google Patents
Switch control circuit and foot tub Download PDFInfo
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- CN210075604U CN210075604U CN201920538207.2U CN201920538207U CN210075604U CN 210075604 U CN210075604 U CN 210075604U CN 201920538207 U CN201920538207 U CN 201920538207U CN 210075604 U CN210075604 U CN 210075604U
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Abstract
The utility model relates to a switch control circuit and lavipeditum basin, wherein, the switch control circuit is applied to the lavipeditum basin, the lavipeditum basin includes heating tube and isolation layer, the heating tube is used for connecting the first power cord, the isolation layer is used for connecting the second power cord, the first power cord and the second power cord are respectively zero line or live wire; the method comprises the following steps: the detection circuit is used for connecting the isolation layer and outputting a detection signal when receiving an induction electric signal generated by the isolation layer; and the switch unit is connected with the detection circuit, is also used for connecting the isolation layer and the power line and is used for being conducted when receiving the detection signal. The utility model discloses, increase detection circuitry and switch unit between isolation layer and power line when detection circuitry detects the response signal of telecommunication that the isolation layer produced, output detected signal to switch unit, switch unit switches on, makes the isolation layer connect the power cord, and the zero line ensures that the heating tube isolation layer is connected with the zero line promptly, eliminates or reduces the response electricity that the heating tube produced, improves the security of lavipeditum basin.
Description
Technical Field
The utility model relates to a lavipeditum basin technical field especially relates to a switch control circuit and lavipeditum basin.
Background
With the increase of the attention of people to health, the foot tub becomes one of the most common health care products at present, and the common foot tub sold on the market at present belongs to two types of electric appliances in the safety standard of household appliances, has no grounding requirement, and generally adopts a two-hole plug.
Because the lavipeditum ware heats water through the heating tube, but the heating tube itself is directly soaked in the aquatic, so the response electricity that the distributed capacitance that heating tube and water formed produced can't effectively be eliminated through heating tube shell ground connection mode, and present solution is to add an isolation layer on the heat-generating body, connects the zero line through the isolation layer and reduces the potential difference between heating tube and the ground, reaches the problem that reduces or even eliminates the response electricity.
However, the user of the two-hole plug is difficult to distinguish the zero line and the live line when in use, the situation of reverse connection can be caused, and if the reverse connection can cause the live line to be connected to the isolation layer, induced electricity is generated, and potential safety hazards are caused.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a switch control circuit and a foot tub for solving the problem that an isolation layer is difficult to be connected to a zero line.
A switch control circuit is applied to a heating device, the heating device comprises a heating tube and an isolation layer, the heating tube is used for being connected with a first power line, the isolation layer is used for being connected with a second power line, one of the first power line and the second power line is a zero line, and the other one of the first power line and the second power line is a live line;
the switch control circuit includes:
the detection circuit is used for connecting the isolation layer and outputting a detection signal when receiving an induction electric signal generated by the isolation layer;
and the switch unit is connected with the detection circuit, is also used for being connected in series between the isolation layer and the second power line and is used for being conducted when receiving the detection signal.
In one embodiment, the switching unit includes:
the controller is connected with the detection circuit and used for outputting a driving signal when receiving the detection signal;
and the controlled switch is connected with the controller, is also used for connecting the isolation layer and the second power line and is used for conducting when receiving the driving signal.
In one embodiment, the controlled switch comprises a controlled end, an input end and an output end; the output end of the controlled switch is used for being connected with the isolation layer, the input end of the controlled switch is used for being connected with the second power line, and the controlled end of the controlled switch is connected with the controller. In one embodiment, the controller is an MCU.
In one embodiment, the detection circuit comprises: an NPN triode Q1, an NPN triode Q2 and a photoelectric coupler;
the base electrode of the NPN triode Q1 is used for being connected with the isolation layer, the collector electrode of the NPN triode Q1 is used for being connected with the working power supply, and the emitter electrode of the NPN triode Q2 is connected with the base electrode of the NPN triode Q2;
a collector of the NPN triode Q2 is connected with a cathode of a light emitting diode in the photoelectric coupler, and an emitter of the NPN triode Q2 is connected with a second power line;
the positive pole of the light emitting diode of the photoelectric coupler is used for being connected with a working power supply, the emitting electrode of the phototriode of the photoelectric coupler is grounded, and the collecting electrode of the phototriode is connected with the controller and is also used for being connected with the working power supply.
In one embodiment, the controlled switch is a bidirectional optocoupler;
the anode of a light emitting diode of the bidirectional photoelectric coupler is used for being connected with a working power supply, and the cathode of the light emitting diode is connected with the controller;
the first end of the bidirectional controllable silicon of the bidirectional photoelectric coupler is used for connecting the isolation layer, and the second end of the bidirectional controllable silicon of the bidirectional photoelectric coupler is used for connecting the second power line.
In one embodiment, the controller comprises an input terminal and an output terminal;
the input end of the controller is connected with the collector of the photoelectric coupler, and the output end of the controller is connected with the cathode of the light emitting diode of the bidirectional photoelectric coupler.
In one embodiment, the detection circuit further comprises: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7;
the first end of the resistor R1 is used for being connected with the isolation layer, and the second end of the resistor R1 is connected with the base electrode of the NPN triode Q1;
a first end of the resistor R2 is connected with a first end of the resistor R1, and a second end is connected with an emitter of the NPN triode Q2;
the first end of the resistor R3 is connected with the emitter of the NPN triode Q1, and the second end is connected with the base of the NPN triode Q2;
the first end of the resistor R4 is used for connecting a working power supply, and the second end of the resistor R4 is connected with the anode of a light emitting diode of the photoelectric coupler;
the first end of the resistor R5 is connected with the collector of the phototriode of the photoelectric coupler, and the second end of the resistor R5 is used for connecting the working power supply and the input end of the controller;
the first end of the resistor R6 is used for connecting a working power supply, and the second end of the resistor R6 is connected with the anode of a light emitting diode of the bidirectional photoelectric coupler;
the first end of the resistor R7 is used for connecting the working power supply, and the second end is connected with the second end of the resistor R5.
A foot tub comprising: the heating tube, the isolation layer and the switch control circuit;
the heating tube is used for connecting a first power line, the isolation layer is connected with the switch control circuit, and the switch control circuit is used for connecting a second power line;
one of the first power line and the second power line is a zero line, and the other one is a live line.
In one embodiment, the foot tub further comprises:
the live wire detection unit is used for connecting a second power line and outputting a switching signal when the second power line is detected to be a live wire;
the zero-live wire switching circuit is connected with the heating tube, the switch control circuit and the live wire detection unit, is also used for connecting a first power line and a second power line, and is used for switching the zero wire connected with the heating tube into the live wire and switching the live wire connected with the switch control circuit into the zero wire when receiving a switching signal.
Above-mentioned switch control circuit, increase detection circuitry and switch element between isolation layer and second power line, when the first power cord of heating tube connector is the live wire, the second power cord is the zero line promptly, produce the response electricity between heating tube and the isolation layer, when detection circuitry detects the response signal of telecommunication that the isolation layer produced, output detected signal to switch element, switch element switches on, make the isolation layer connect the power cord, the zero line promptly, ensure that the isolation layer is connected with the zero line, eliminate or reduce the response electricity, improve the security of lavipeditum basin.
Drawings
FIG. 1 is a schematic diagram of a switch control circuit according to an embodiment;
FIG. 2 is a schematic diagram of a switch unit according to an embodiment;
FIG. 3 is a schematic circuit diagram of a switch control circuit according to an embodiment;
FIG. 4 is a schematic circuit diagram of a switch control circuit according to another embodiment;
FIG. 5 is a schematic circuit diagram of a switch control circuit according to another embodiment;
FIG. 6 is a schematic circuit diagram of a switch control circuit according to yet another embodiment;
FIG. 7 is a schematic circuit diagram of a zero-hot line switching circuit according to an embodiment.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully below. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The term "connected" as used herein is electrically connected unless otherwise specified. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In one embodiment, the switch control circuit is applied to a heating device, the heating device comprises a heating tube and an isolation layer, the heating tube is used for being connected with a first power line, the isolation layer is used for being connected with a second power line, one of the first power line and the second power line is a zero line, and the other one of the first power line and the second power line is a live line; as shown in fig. 1, includes:
the detection circuit 100 is used for connecting the isolation layer and outputting a detection signal when receiving an induction electric signal generated by the isolation layer;
the switch unit 200 is connected to the detection circuit 100, and is further configured to be connected in series between the isolation layer and the second power line, and is configured to be turned on when receiving the detection signal.
In one embodiment, the heating device may be a foot tub, a water heater, an electric kettle, or the like.
The second power line is one of a zero line and a live line, when the heating tube is connected with the live line, the second power line connected with the switch unit is the zero line, and when the heating tube is connected with the zero line, the second power line connected with the switch unit is the live line.
After the plug is plugged in a user, in order to eliminate induced electricity, the live wire is required to be connected with the heating tube, the isolation layer is connected with the zero line to reduce the potential difference between the heating tube and the ground, and the purpose of reducing or eliminating the induced electricity is achieved.
In one embodiment, if the heat pipe is connected to the zero line, the second power line connected to the switch unit 200 is the live line, the switching circuit can be used to exchange the connected zero line and live line, connect the zero line to the switch unit 200, and connect the live line to the heat pipe, so that the switch unit is turned on, and connect the zero line to the isolation layer.
In one embodiment, as shown in fig. 2, the switching unit 200 includes:
a controller 210 connected to the detection circuit 100 for outputting a driving signal when receiving the detection signal;
the controlled switch 220 is connected to the controller 210, and is further used for connecting the isolation layer and the second power line, and is turned on when receiving the driving signal.
In one embodiment, the controller 210 may be an MCU or a PLC. When the controller 210 receives the detection signal output by the detection circuit 100, a driving signal is output to the controlled switch 220, and the driving signal is used for driving the controlled switch 220 to be conducted so as to connect the zero line with the isolation layer.
In one embodiment, the controlled switch 220 may include one or more of a photo-coupler, a thyristor, an electronic switching chip, a transistor, and a MOS transistor.
In one embodiment, the controlled switch 220 comprises a controlled terminal, an input terminal, and an output terminal; the output terminal of the controlled switch 220 is connected to the isolation layer, the input terminal is connected to the second power line, and the controlled terminal is connected to the controller 210.
The controlled switch 220 is respectively connected with the isolation layer and the second power line, the controlled end is connected with the controller 210, when the driving signal output by the controller 210 is not received, the controlled switch 220 is in a disconnected state, the isolation layer is not connected with the second power line, when the controlled switch 220 receives the driving signal output by the controller, the controlled switch 220 is switched on, and the isolation layer is connected with the second power line. In one embodiment, the controller is an MCU.
The MCU can be selected from single-chip microcomputers of MC96F8316, MC96F6332, SH79F8910, HR7P169B, etc., and can be selected by the skilled in the art according to the actual needs of the product.
In one embodiment, as shown in fig. 3, the detection circuit 100 includes: an NPN triode Q1, an NPN triode Q2 and a photoelectric coupler OC 1;
the base electrode of the NPN triode Q1 is used for being connected with the isolation layer, the collector electrode of the NPN triode Q1 is used for being connected with the working power supply, and the emitter electrode of the NPN triode Q2 is connected with the base electrode of the NPN triode Q2;
a collector of the NPN triode Q2 is connected with a cathode of a light emitting diode in the photoelectric coupler OC1, and an emitter of the NPN triode Q2 is connected with a second power line;
the positive pole of the light emitting diode of the photoelectric coupler OC1 is used for being connected with a working power supply, the emitting electrode of the phototriode of the photoelectric coupler OC1 is grounded, and the collecting electrode of the phototriode is connected with the controller 210 and is also used for being connected with the working power supply.
The conduction condition of the NPN transistor must satisfy the highest collector potential and the lowest emitter potential, so when the heating tube is connected to the live wire, an induced electrical signal is generated between the heating tube and the isolation layer and is output to the base of the NPN transistor Q1, the emitter of the NPN transistor Q2 is connected to the zero line, the NPN transistor Q1 is conducted with the NPN transistor Q2, the light emitting diode of the photocoupler OC1 is conducted to emit light, the phototriode of the photocoupler OC1 is conducted, and a detection signal is output to the controller 210. The opto-coupler OC1 can function as an isolation controller.
In one embodiment, as shown in fig. 3, the controlled switch 220 is a bidirectional opto-coupler OC 2;
the anode of the light emitting diode of the bidirectional photoelectric coupler OC2 is used for being connected with a working power supply V, and the cathode of the light emitting diode is connected with the controller 210;
the first end of the bidirectional thyristor of the bidirectional photoelectric coupler OC2 is used for connecting the isolation layer, and the second end is used for connecting a second power line.
Since the foot tub is connected with the mains supply, namely, alternating current, the controlled switch 220 adopts a bidirectional photoelectric coupler OC2, and the controlled switch 220 is prevented from being reversely broken down. The bidirectional photocoupler can be used to isolate the controller 210 from the isolation layer.
In one embodiment, the controller 210 includes an input and an output;
the input end of the controller 210 is connected to the collector of the photocoupler, and the output end is connected to the cathode of the led of the bidirectional photocoupler OC 2.
The input end of the controller 210 is used for receiving the detection signal output by the detection circuit 100, and when receiving the detection signal, the controller outputs a driving signal to the bidirectional optocoupler OC2 through the output end.
In one embodiment, as shown in fig. 4, the detection circuit 100 further includes: a resistor R1, a resistor R2 and a resistor R3;
the first end of the resistor R1 is used for being connected with the isolation layer, and the second end of the resistor R1 is connected with the base electrode of the NPN triode Q1;
a first end of the resistor R2 is connected with a first end of the resistor R1, and a second end is connected with an emitter of the NPN triode Q2;
the resistor R3 has a first terminal connected to the emitter of the NPN transistor Q1 and a second terminal connected to the base of the NPN transistor Q2.
The resistor R1 and the resistor R3 are both current-limiting resistors, and limit the current input to the base of the NPN transistor Q1 and the base of the NPN transistor Q2, thereby protecting the NPN transistor Q1 and the NPN transistor Q2. Resistor R2 is a bias resistor for regulating the base bias current of NPN transistor Q1.
In one embodiment, as shown in fig. 5, the detection circuit 100 further includes a resistor R4, a resistor R5, and a resistor R6;
the first end of the resistor R4 is used for connecting a working power supply V, and the second end of the resistor R4 is connected with the anode of a light emitting diode of the photoelectric coupler OC 1;
the first end of the resistor R5 is connected with the collector of the phototriode of the photoelectric coupler OC1, and the second end is used for connecting the working power supply and the input end of the controller 210;
the first end of the resistor R6 is used for connecting the working power supply V, and the second end is connected with the anode of the light emitting diode of the bidirectional photoelectric coupler OC 2.
The resistor R4 is a current limiting resistor and is used for limiting the current of the input photoelectric coupler OC1 and protecting the photoelectric coupler OC 1. The resistor R5 is a current limiting resistor, and is used to limit the current of the detection signal output to the controller 210, and protect the controller 210. The resistor R6 is a current-limiting resistor and is used for limiting the current input into the bidirectional photoelectric coupler OC2 and protecting the bidirectional photoelectric coupler OC 2.
In one embodiment, as shown in fig. 6, the detection circuit further includes: a resistor R7 and a capacitor C1;
the first end of the resistor R7 is used for connecting a working power supply, and the second end is connected with the second end of the resistor R5;
the capacitor C1 has a first terminal connected to the second terminal of the resistor R5 and a second terminal connected to ground.
The resistor R7 is a pull-up resistor, clamps the collector of the photoelectric coupler OC1 phototriode at a high level, and simultaneously limits the current output by the working power supply V to protect the photoelectric coupler OC 1. The capacitor C1 functions as a filter.
In one embodiment, the switch control circuit is described in detail in conjunction with fig. 6:
the base electrode of the NPN triode Q1 is connected with the isolation layer through a resistor R1, the collector electrode of the NPN triode Q1 is connected with the working power supply V, the emitter electrode of the NPN triode Q2 is connected with the base electrode of the NPN triode Q3, the collector electrode of the NPN triode Q2 is connected with the cathode of the light emitting diode of the photoelectric coupler OC1, the emitter electrode of the NPN triode Q2 is used for being connected with a second power line, the first end of the resistor R2 is connected with the first end of the resistor R1, the second end of the resistor R8 is grounded. The positive pole of the emitting diode of optoelectronic coupler OC1 passes through resistance R4 and connects working power supply V, the collector connecting resistance R5's first end of optoelectronic coupler OC 1's phototriode, the emitter ground, resistance R5's second end is connecting resistance R7's second end and controller MCU's input AC _ Dect respectively, resistance R7's first end is used for connecting working power supply V, controller MCU's output AC _ SCR connects the negative pole of the emitting diode of two-way optoelectronic coupler OC2, optoelectronic coupler OC 2's emitting diode's positive pole passes through resistance R6 and connects working power supply V, the two-way controllable silicon first end of two-way optoelectronic coupler OC2 is used for connecting the isolation layer, the second end is used for connecting the second power cord. When the heating tube is connected with a live wire, a second power line to be connected with the isolation layer is a zero line, the heating tube and the isolation layer generate induced electricity, the isolation layer outputs an induced electricity signal to the NPN triode Q1, the NPN triode Q1 is conducted with the NPN triode Q2, so that a light emitting diode of the photoelectric coupler OC1 is conducted and shines, a photosensitive triode of the photoelectric coupler OC1 is conducted after receiving the light signal, a detection signal is output to the input end of the controller 210, the controller 210 outputs a driving signal to the bidirectional photoelectric coupler OC2 through the output end after receiving the detection signal, the bidirectional photoelectric coupler OC2 is conducted, and the isolation layer is communicated with the second power line. If the second power line is a live wire, the heating tube is connected with a zero line, and the isolation layer is not communicated with the second power line. In one embodiment, the zero line and the live line that insert are exchanged through the relay for the heating tube is connected with the live line, and the second power cord is the zero line, thereby is connected to the zero line with the isolation layer.
In one embodiment, a foot tub comprises: the heating tube, the isolation layer and the switch control circuit;
the heating tube is used for connecting a first power line, the isolation layer is connected with the switch control circuit, and the switch control circuit is used for connecting a second power line;
one of the first power line and the second power line is a zero line, and the other one is a live line.
In one embodiment, the foot tub further comprises:
the live wire detection unit is used for connecting a second power line and outputting a switching signal when the second power line is detected to be a live wire;
the zero-live wire switching circuit is connected with the heating tube, the switch control circuit and the live wire detection unit, is also used for connecting a first power line and a second power line, and is used for switching the zero wire connected with the heating tube into the live wire and switching the live wire connected with the switch control circuit into the zero wire when receiving a switching signal.
In one embodiment, the live wire detection unit may include a silicon controlled rectifier and a single chip microcomputer, a gate of the silicon controlled rectifier is connected to a second power line, a first end of the silicon controlled rectifier is connected to the working power supply, a second end of the silicon controlled rectifier is connected to the single chip microcomputer, when the second power line is a live wire, the silicon controlled rectifier is triggered, a trigger signal is output to the single chip microcomputer, the single chip microcomputer is connected to the zero-live wire switching circuit, and when the single chip microcomputer receives the trigger signal, the switching signal is output.
In one embodiment, as shown in fig. 7, the zero-live wire switching circuit includes a first relay, a second relay and a driving chip U1, a first end of a coil of the first relay is connected to a working power supply V, a second end of the coil is connected to an output end of the driving chip U1, a first contact a of the first relay is connected to a heating tube, a second contact b and a third contact c are respectively connected to a live wire or a zero wire, a first end of a coil of the second relay is connected to the working power supply V, a second end of the coil is connected to an output end of the driving chip U1, a first contact d of the second relay is connected to a switch control circuit, a second contact e and a third contact f are respectively connected to a live wire or a zero wire, when the first relay is connected to the live wire, and when the first relay is connected to the live wire, the second relay is connected to the zero wire; when the driving chip receives the switching signal, the first relay and the second relay are controlled to act, and the isolation layer is connected with the zero line.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A switch control circuit is applied to a heating device, the heating device comprises a heating tube and an isolation layer, the heating tube is used for being connected with a first power line, the isolation layer is used for being connected with a second power line, one of the first power line and the second power line is a zero line, and the other one of the first power line and the second power line is a live line;
it is characterized by comprising:
the detection circuit is connected with the isolation layer and outputs a detection signal when receiving the induction electric signal generated by the isolation layer;
and the switch unit is connected with the detection circuit, is also used for being connected in series between the isolation layer and the second power line and is used for being conducted when receiving the detection signal.
2. The switch control circuit according to claim 1, wherein the switching unit comprises:
the controller is connected with the detection circuit and used for outputting a driving signal when receiving the detection signal;
and the controlled switch is connected with the controller, is also used for connecting the isolation layer and the second power line and is used for conducting when receiving the driving signal.
3. The switch control circuit of claim 2, wherein the controlled switch comprises a controlled terminal, an input terminal, and an output terminal;
the output end of the controlled switch is used for being connected with the isolation layer, the input end of the controlled switch is used for being connected with the second power line, and the controlled end of the controlled switch is connected with the controller.
4. The switch control circuit of claim 2, wherein the controller is an MCU.
5. The switch control circuit of claim 4, wherein the detection circuit comprises: an NPN triode Q1, an NPN triode Q2 and a photoelectric coupler;
the base electrode of the NPN triode Q1 is used for being connected with the isolation layer, the collector electrode of the NPN triode Q1 is used for being connected with a working power supply, and the emitter electrode of the NPN triode Q2 is connected with the base electrode of the NPN triode Q2;
a collector of the NPN triode Q2 is connected with a cathode of a light emitting diode in the photoelectric coupler, and an emitter of the NPN triode Q2 is used for being connected with the second power line;
the positive pole of emitting diode of photoelectric coupler is used for connecting working power supply, photoelectric coupler's phototriode's emitter ground, the collecting electrode is connected the controller, still is used for connecting working power supply.
6. The switch control circuit of claim 5, wherein the controlled switch is a bi-directional optocoupler;
the anode of a light emitting diode of the bidirectional photoelectric coupler is used for being connected with the working power supply, and the cathode of the light emitting diode of the bidirectional photoelectric coupler is connected with the controller;
and the first end of the bidirectional controllable silicon of the bidirectional photoelectric coupler is used for being connected with the isolation layer, and the second end of the bidirectional controllable silicon of the bidirectional photoelectric coupler is used for being connected with the second power line.
7. The switch control circuit of claim 6, wherein the controller comprises an input and an output;
the input end of the controller is connected with the collector of the photoelectric coupler, and the output end of the controller is connected with the cathode of the light emitting diode of the bidirectional photoelectric coupler.
8. The switch control circuit of claim 7, wherein the detection circuit further comprises: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7;
the first end of the resistor R1 is used for being connected with the isolation layer, and the second end of the resistor R1 is connected with the base electrode of the NPN triode Q1;
the first end of the resistor R2 is connected with the first end of the resistor R1, and the second end is connected with the emitter of the NPN triode Q2;
the first end of the resistor R3 is connected with the emitter of the NPN triode Q1, and the second end is connected with the base of the NPN triode Q2;
the first end of the resistor R4 is used for being connected with the working power supply, and the second end of the resistor R4 is connected with the anode of the light emitting diode of the photoelectric coupler;
the first end of the resistor R5 is connected with the collector of the phototriode of the photoelectric coupler, and the second end of the resistor R5 is used for connecting the working power supply and the input end of the controller;
the first end of the resistor R6 is used for being connected with the working power supply, and the second end of the resistor R6 is connected with the anode of the light emitting diode of the bidirectional photoelectric coupler;
the first end of the resistor R7 is used for connecting the working power supply, and the second end is connected with the second end of the resistor R5.
9. A foot tub, comprising: a heating tube, an isolation layer and a switch control circuit according to any one of claims 1 to 8;
the heating tube is used for connecting a first power line, the isolation layer is connected with the switch control circuit, and the switch control circuit is used for connecting a second power line;
one of the first power line and the second power line is a zero line, and the other one is a live line.
10. The foot tub of claim 9, further comprising:
the live wire detection unit is used for connecting the second power line and outputting a switching signal when the second power line is detected to be a live wire;
and the zero-live wire switching circuit is connected with the heating tube, the switch control circuit and the live wire detection unit and is also used for connecting the first power line and the second power line and receiving the switching signal, the zero wire connected with the heating tube is switched into the live wire and the live wire connected with the switch control circuit is switched into the zero wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920538207.2U CN210075604U (en) | 2019-04-19 | 2019-04-19 | Switch control circuit and foot tub |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920538207.2U CN210075604U (en) | 2019-04-19 | 2019-04-19 | Switch control circuit and foot tub |
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| Publication Number | Publication Date |
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| CN210075604U true CN210075604U (en) | 2020-02-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883582A (en) * | 2021-09-28 | 2022-01-04 | 广东绿岛风空气系统股份有限公司 | Bathroom heater control circuit and bathroom heater |
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2019
- 2019-04-19 CN CN201920538207.2U patent/CN210075604U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883582A (en) * | 2021-09-28 | 2022-01-04 | 广东绿岛风空气系统股份有限公司 | Bathroom heater control circuit and bathroom heater |
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