CN210075183U - Contactless switch - Google Patents
Contactless switch Download PDFInfo
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- CN210075183U CN210075183U CN201921289528.XU CN201921289528U CN210075183U CN 210075183 U CN210075183 U CN 210075183U CN 201921289528 U CN201921289528 U CN 201921289528U CN 210075183 U CN210075183 U CN 210075183U
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Abstract
The utility model relates to a contactless switch, it includes rectifier circuit, semiconductor switch circuit, drive circuit, switch detection circuit and gets the electric circuit, rectifier circuit's direct current output end and semiconductor switch circuit electric connection, semiconductor switch circuit still with drive circuit electric connection, drive circuit still with switch detection circuit electric connection, get the electric circuit and supply power for switch detection circuit; the alternating current wiring ends of the rectification circuit are an alternating current input end and an alternating current output end, and when the switch detection circuit detects that the on-off state of the switch of the rectification circuit is changed, the drive circuit is controlled to change the corresponding on-off state of the semiconductor switch circuit so as to control the on-off of the alternating current output end. The utility model discloses control load break-make electricity in-process, the contact or the separation of physical properties such as no mechanical contact, so can not produce physical phenomena such as electric arc or electric spark, make the switch can be arranged in probably having the environment of inflammable and explosive gas for life safety or material safety in some hazardous environment have better guarantee.
Description
Technical Field
The utility model relates to a sparkless switch, especially a contactless switch.
Background
The switch is an essential electrician product in daily life, and various safety accidents related to the switch occur in real life. If gas leaks due to carelessness of a residence, a person turns on the switch under the condition of no precaution, and gas explosion can happen. If the mechanical switch is aged to generate electric arc or electric spark when it is opened or closed, such as when the coal mine may be filled with inflammable gas such as gas, a serious consequence of a large explosion is generated. In order to reduce these safety accidents, it is necessary to improve the safety performance of the switch, and therefore, it is necessary to develop a highly stable contactless switch technology.
The sparkless switch disclosed in chinese patent publication No. CN97104328 is a combination of the respective features of a mechanical contact switch and a semiconductor contactless switch. The two switches are combined into a whole, the time difference of the actions of the two switches is utilized, the defect of sparking of a mechanical switch contact is overcome by the advantage of no spark discharge of a semiconductor switch, and meanwhile, the short positions of large conduction voltage drop and high junction temperature of the semiconductor switch are made up by the advantage that the conduction voltage drop of the mechanical switch contact is close to zero. Tests show that the switch works under rated current, and within 105 times of service life, over 95% of actions do not generate spark discharge, and under 5% of actions, only very slight spark discharge occurs, so certain potential safety hazards still exist.
Disclosure of Invention
An object of the utility model is to provide a contactless switch that is rational in infrastructure, switching process does not have spark, uses safe and reliable.
The purpose of the utility model is realized like this:
a contactless switch, characterized by: the direct current output end of the rectification circuit is electrically connected with the semiconductor switch circuit, the semiconductor switch circuit is also electrically connected with the driving circuit, the driving circuit is also electrically connected with the switch detection circuit, and the power taking circuit supplies power to the switch detection circuit; the alternating current wiring ends of the rectification circuit are an alternating current input end and an alternating current output end, and when the switch detection circuit detects that the on-off state of the switch of the rectification circuit is changed, the drive circuit is controlled to change the corresponding on-off state of the semiconductor switch circuit so as to control the on-off of the alternating current output end.
The purpose of the utility model can also adopt the following technical measures to solve:
more specifically, the semiconductor switch circuit is a unidirectional conduction circuit, and the unidirectional conduction circuit is (but not limited to) one of an NMOS field effect transistor switch circuit, a PMOS field effect transistor switch circuit, and an IGBT insulated gate bipolar transistor circuit, or a combination of any two or more of them.
As a further scheme, the contactless switch further comprises a protection circuit, and the protection circuit is electrically connected with the semiconductor switch circuit, or the protection circuit is electrically connected with the semiconductor switch circuit through a driving circuit. The protection circuit itself may act directly to protect the semiconductor switch circuit, or the protection circuit may act on the drive circuit to protect the semiconductor switch circuit.
As a further scheme, the protection circuit includes (but is not limited to) one of a temperature protection circuit, an overvoltage protection circuit, an overcurrent protection circuit, a short-circuit protection circuit and an inrush current protection circuit, or a combination of any two or more circuits.
When the temperature protection circuit detects that the internal temperature value of the semiconductor switch circuit exceeds the threshold value, the temperature protection circuit can act on the driving circuit to control the semiconductor switch circuit, so that the loss power of the semiconductor switch circuit is reduced, and the purpose of reducing the internal temperature of the semiconductor switch circuit is achieved.
When the overvoltage protection circuit detects that the voltage value borne by the semiconductor switch circuit exceeds the threshold value, the overvoltage protection circuit can reduce the voltage value borne by the semiconductor switch circuit so as to achieve the purpose of protecting the semiconductor switch circuit.
When the overcurrent protection circuit detects that the current value passing through the interior of the semiconductor switch circuit exceeds the threshold value, the overcurrent protection circuit can act on the drive circuit to control the semiconductor switch circuit, so that the current value passing through the semiconductor switch circuit is reduced, and the purpose of protecting the semiconductor switch circuit is achieved.
When the short-circuit protection circuit detects that a certain device is short-circuited in a loop formed by the bridge rectifier circuit, the semiconductor switch circuit and the load, the short-circuit protection circuit can act on the driving circuit to control the semiconductor switch circuit so as to achieve the purpose of protecting the semiconductor switch circuit.
When the surge current protection circuit detects that surge current occurs in a loop formed by the bridge rectifier circuit, the semiconductor switch circuit and the load, the surge current protection circuit can absorb the surge current so as to achieve the purpose of protecting the semiconductor switch circuit.
As a further scheme, the rectification circuit is a bridge rectification circuit.
As a further scheme, the power-taking circuit includes (but is not limited to) one of a zero live wire power-taking circuit, a single live wire power-taking circuit and a battery power-taking circuit or a combination of any two or more circuits.
As a further scheme, the power taking circuit is provided with a voltage stabilizing chip and a filter capacitor. The switch detection circuit can stably detect the on and off states of the switch without errors by forming stable voltage after voltage stabilization by the voltage stabilization chip and filtering by the filter capacitor.
As a further scheme, more than one alternating current output end is arranged, each alternating current output end is correspondingly provided with a rectifying circuit, and each rectifying circuit is connected with a semiconductor switch circuit and a driving circuit; the switch detection circuit is provided with more than one signal switch, the signal switches correspond to the driving circuits one by one, and the power taking circuit is provided with one.
As a further scheme, the switch detection circuit is provided with a touch control chip, and the signal switch is a touch switch.
As a further scheme, the alternating current output ends are respectively connected with loads.
The utility model has the advantages as follows:
when the contactless switch detects that the on-off state of the switch is changed, the contactless switch can control the driving circuit to change the corresponding on-off state of the semiconductor switch circuit so as to achieve the function of controlling the on-off state of the load; in the process of controlling the on-off of the load, no contact with or separated from physical contacts such as mechanical contacts and the like exists, so that no physical phenomena such as electric arcs or electric sparks and the like occur, the switch can be used in environments with flammable and explosive gases possibly, and the life safety or material safety in certain dangerous environments is better guaranteed.
Drawings
Fig. 1 is a schematic circuit block diagram of a first embodiment of the present invention.
Fig. 2 is a circuit schematic diagram of an embodiment of the middle power supply circuit of the present invention.
Fig. 3 is a schematic circuit block diagram of a second embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of a second embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of a third embodiment of the present invention.
Fig. 6 is a schematic circuit block diagram of a fourth embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
Example one
Referring to fig. 1, a contactless switch includes a rectifying circuit 20, a semiconductor switch circuit 60, a driving circuit 30, a switch detection circuit 40, a power taking circuit 50 and a protection circuit 70, wherein a dc output end of the rectifying circuit 20 is electrically connected to the semiconductor switch circuit 60, the semiconductor switch circuit 60 is also electrically connected to the driving circuit 30, the driving circuit 30 is also electrically connected to the switch detection circuit 40, and the power taking circuit 50 supplies power to the switch detection circuit 40; the ac terminals of the rectifier circuit 20 are an ac input terminal (i.e., a live line input terminal LIN) and an ac output terminal (i.e., a live line output terminal LOUT), and when the switch detection circuit 40 detects that the on-off state of the switch thereof is changed, the control driving circuit 30 changes the corresponding on-off state of the semiconductor switch circuit 60 to control the on-off of the ac output terminal. The protection circuit 70 is electrically connected to the semiconductor switch circuit 60 and the drive circuit 30. When the contactless switch is connected with the load 10 for use, the load 10 is connected with the zero line N and the live line output end LOUT respectively.
Referring to fig. 2, the power-taking circuit 50 is a battery power-taking circuit, the battery power-taking circuit includes a battery 501, a first capacitor C1, a voltage-stabilizing chip V1 and a second capacitor C2, the first capacitor C1 is connected between the positive and negative electrodes of the battery 501, the positive input end of the voltage-stabilizing chip V1 is connected with the positive electrode of the battery 501, the negative connection end of the voltage-stabilizing chip V1 is connected with the negative electrode of the battery 501, and the second capacitor C2 is connected between the negative connection end of the voltage-stabilizing chip V1 and the voltage-stabilizing positive output end. The voltage-stabilizing positive output terminal of the voltage-stabilizing chip V1 supplies power to the switch detection circuit 40.
The semiconductor switch circuit 60 is a unidirectional turn-on circuit, and the unidirectional turn-on circuit is one or a combination of more than two of an NMOS field effect transistor switch circuit, a PMOS field effect transistor switch circuit and an IGBT insulated gate bipolar transistor circuit.
The protection circuit 70 includes one of a temperature protection circuit 70, an overvoltage protection circuit 70, an overcurrent protection circuit 70, a short-circuit protection circuit 70 and an inrush current protection circuit 70, or a combination of any two or more circuits.
The rectifying circuit 20 is a bridge rectifying circuit.
Example two
Referring to fig. 3, a contactless switch includes a rectifying circuit 20, a semiconductor switch circuit 60, a driving circuit 30, a switch detection circuit 40, a power taking circuit 50 and a protection circuit 70, wherein a dc output end of the rectifying circuit 20 is electrically connected to the semiconductor switch circuit 60, the semiconductor switch circuit 60 is also electrically connected to the driving circuit 30, the driving circuit 30 is also electrically connected to the switch detection circuit 40, and the power taking circuit 50 supplies power to the switch detection circuit 40; the ac terminals of the rectifier circuit 20 are an ac input terminal (i.e., a live line input terminal LIN) and an ac output terminal (i.e., a live line output terminal LOUT), and when the switch detection circuit 40 detects that the on-off state of the switch thereof is changed, the control driving circuit 30 changes the corresponding on-off state of the semiconductor switch circuit 60 to control the on-off of the ac output terminal. The protection circuit 70 is electrically connected to the semiconductor switch circuit 60 and the drive circuit 30. When the contactless switch is connected with the load 10 for use, the load 10 is connected with the zero line N and the live line output end LOUT respectively.
The power supply circuit 50 comprises a zero-live wire power supply circuit.
The semiconductor switch circuit 60 is a unidirectional turn-on circuit, which is an NMOS field effect transistor switch circuit.
The protection circuit 70 includes a temperature protection circuit.
The rectifying circuit 20 is a bridge rectifying circuit.
Referring to fig. 4, the power-taking circuit 50 is composed of a transformer T1, a first diode D1, a first capacitor C1, a voltage-stabilizing chip V1, and a second capacitor C2, an input end of the transformer T1 is connected to a live line input end LIN and a zero line N, an output end of the transformer T1 supplies power to the driving circuit 30 through direct current rectified by the first diode D1 and filtered by the first capacitor C1, and meanwhile, the rectified and filtered direct current is further stabilized by the voltage-stabilizing chip V1 and filtered by the second capacitor C2 to supply power to the switch detection circuit 40.
The driving circuit 30 includes a fourth resistor R4, a first transistor Q1, and a second transistor Q2.
The switch detection circuit 40 includes a touch control chip IC1 and a touch switch TS 1.
The semiconductor switch circuit 60 includes a second resistor R2 and an NMOS field-effect transistor Q3, a G pole (control pole) of the NMOS field-effect transistor Q3 is connected to one end of the driving circuit 30 and the second resistor R2, an S pole (output pole) of the NMOS field-effect transistor Q3 is connected to the other end of the second resistor R2 and grounded, and a D pole (power supply pole) of the NMOS field-effect transistor Q3 is connected to a dc output end of the rectifying circuit 20.
The protection circuit 70 comprises a thermistor R3, a fifth resistor R5 and a third capacitor C3, one end of the thermistor R3 is connected with the D pole of an NMOS field effect transistor Q3, the other end of the thermistor R3 is grounded, and the fifth resistor R5 and the third capacitor C3 are connected in series and then connected in parallel between the two ends of the thermistor R3.
EXAMPLE III
Referring to fig. 5, a contactless switch includes a rectifying circuit 20, a semiconductor switch circuit 60, a driving circuit 30, a switch detection circuit 40, a power taking circuit 50 and a protection circuit 70, wherein a dc output end of the rectifying circuit 20 is electrically connected to the semiconductor switch circuit 60, the semiconductor switch circuit 60 is also electrically connected to the driving circuit 30, the driving circuit 30 is also electrically connected to the switch detection circuit 40, and the power taking circuit 50 supplies power to the switch detection circuit 40; the ac terminals of the rectifier circuit 20 are an ac input terminal and an ac output terminal, and when the switch detection circuit 40 detects that the on-off state of the switch thereof is changed, the control driving circuit 30 changes the corresponding on-off state of the semiconductor switch circuit 60 to control the on-off of the ac output terminal. The protection circuit 70 is electrically connected to the semiconductor switch circuit 60 and the drive circuit 30.
The two alternating current output ends are respectively a live wire output end LOUT1 and a live wire output end LOUT2, the live wire output end LOUT1 and the live wire output end LOUT2 are respectively and correspondingly provided with a rectifying circuit 20, and each rectifying circuit 20 is connected with a semiconductor switch circuit 60 and a driving circuit 30; the switch detection circuit 40 is provided with two signal switches, the signal switches correspond to the driving circuits 30 one by one, and the power supply circuit 50 is provided with one.
The power supply circuit 50 comprises a zero-live wire power supply circuit.
The semiconductor switch circuit 60 is a unidirectional turn-on circuit, which is an NMOS field effect transistor switch circuit.
The protection circuit 70 includes a temperature protection circuit.
The rectifying circuit 20 is a bridge rectifying circuit.
The switch detection circuit 40 includes a touch control chip IC1, a first touch switch TS1, and a second touch switch TS 2.
The power taking circuit 50 is composed of a transformer T1, a first diode D1, a second diode D2, a third diode D3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fifth capacitor C5 and a voltage stabilizing chip V1. The input end of the transformer T1 is connected with the live wire input end LIN and the zero wire N, the transformer T1 is provided with three groups of outputs, wherein, the direct current which is rectified by the first diode D1 and filtered by the first capacitor C1 is stabilized by the voltage stabilizing chip V1 and filtered by the second capacitor C2, and then the power is supplied to the switch detection circuit 40. The other group of transformer T1 outputs the dc rectified by the second diode D2 and filtered by the third capacitor C3 to power one of the driver circuits 30, and the other group of transformer T1 outputs the dc rectified by the third diode D3 and filtered by the fifth capacitor C5 to power the other driver circuit 30.
The one driving circuit 30 includes a first resistor R1, a seventh resistor R7, and a first photo-coupler IC 2. The first photo-coupler IC2 is electrically connected to the touch control chip IC1 of the switch detection circuit 40, the first photo-coupler IC2 is electrically connected to the regulated output VCC through a first resistor R1, and the first photo-coupler IC2 is electrically connected to a semiconductor switch circuit 60 through a seventh resistor R7. The semiconductor switch circuit 60 includes an eighth resistor R8 and an NMOS fet Q4, a G-pole (control pole) of the NMOS fet Q4 is connected to one end of the seventh resistor R7 and one end of the eighth resistor R8 of the driving circuit 30, an S-pole (output pole) of the NMOS fet Q4 is connected to the other end of the eighth resistor R8 and grounded, and a D-pole (power supply pole) of the NMOS fet Q4 is connected to a dc output terminal of the rectifying circuit 20.
The further drive circuit 30 comprises a second resistor R2, a third resistor R3 and a second optocoupler IC 3. The second photo-coupler IC3 is electrically connected to the touch control chip IC1 of the switch detection circuit 40, the second photo-coupler IC3 is electrically connected to the regulated output VCC through the second resistor R2, and the second photo-coupler IC3 is electrically connected to the other semiconductor switch circuit 60 through the third resistor R3. The other semiconductor switch circuit 60 includes a fourth resistor R4 and an NMOS fet Q2, a G-pole (control pole) of the NMOS fet Q2 is connected to one ends of the third resistor R3 and the eighth resistor R8 of the other driving circuit 30, an S-pole (output pole) of the NMOS fet Q4 is connected to the other end of the fourth resistor R4 and grounded, and a D-pole (supply pole) of the NMOS fet Q2 is connected to a dc output terminal of the other rectifying circuit 20.
The protection circuit 70 is provided with two, wherein one protection circuit 70 comprises a thermistor R9, a tenth resistor R10 and a sixth capacitor C6, one end of the thermistor R9 is connected with the D pole of the NMOS field effect transistor Q4, the other end of the thermistor R9 is grounded, and the tenth resistor R10 and the sixth capacitor C6 are connected in series and then connected in parallel between the two ends of the thermistor R9. The other protection circuit 70 comprises a thermistor R5, a sixth resistor R6 and a fourth capacitor C4, one end of the thermistor R5 is connected with the D pole of the NMOS field effect transistor Q2, the other end of the thermistor R5 is grounded, and the sixth resistor R6 and the fourth capacitor C4 are connected in series and then connected in parallel between the two ends of the thermistor R5.
In fig. 5, GND denotes ground.
Example four
The difference from the third embodiment is that: referring to fig. 6, three ac output terminals are provided, the three ac output terminals are respectively a live wire output terminal LOUT1, a live wire output terminal LOUT2 and a live wire output terminal LOUT3, the live wire output terminal LOUT1, the live wire output terminal LOUT2 and the live wire output terminal LOUT3 are respectively and correspondingly provided with a rectifying circuit 20, and each rectifying circuit 20 is connected with a semiconductor switch circuit 60 and a driving circuit 30; the switch detection circuit 40 is provided with two signal switches, the signal switches correspond to the driving circuits 30 one by one, and the power supply circuit 50 is provided with one. The live wire output terminal LOUT1, the live wire output terminal LOUT2 and the live wire output terminal LOUT3 are respectively connected with the first load 101, the second load 102 and the third load 103, and the loads are also respectively connected with the zero wire N.
Claims (10)
1. A contactless switch, characterized by: the direct current output end of the rectification circuit is electrically connected with the semiconductor switch circuit, the semiconductor switch circuit is also electrically connected with the driving circuit, the driving circuit is also electrically connected with the switch detection circuit, and the power taking circuit supplies power to the switch detection circuit; the alternating current wiring ends of the rectification circuit are an alternating current input end and an alternating current output end, and when the switch detection circuit detects that the on-off state of the switch of the rectification circuit is changed, the drive circuit is controlled to change the corresponding on-off state of the semiconductor switch circuit so as to control the on-off of the alternating current output end.
2. The contactless switch of claim 1, wherein: the semiconductor switch circuit is a one-way conduction circuit, and the one-way conduction circuit is one or the combination of more than two of an NMOS field effect transistor switch circuit, a PMOS field effect transistor switch circuit and an IGBT bipolar transistor circuit.
3. The contactless switch of claim 1, wherein: the protection circuit is electrically connected with the semiconductor switch circuit, or the protection circuit is electrically connected with the semiconductor switch circuit through the driving circuit.
4. A contactless switch according to claim 3, characterized in that: the protection circuit comprises one or the combination of more than two of a temperature protection circuit, an overvoltage protection circuit, an overcurrent protection circuit, a short-circuit protection circuit and a surge current protection circuit.
5. The contactless switch of claim 1, wherein: the rectification circuit is a bridge rectification circuit.
6. The contactless switch of claim 1, wherein: the power taking circuit comprises one or the combination of more than two of a zero live wire power taking circuit, a single live wire power taking circuit and a battery power taking circuit.
7. The contactless switch of claim 1, wherein: the power taking circuit is provided with a voltage stabilizing chip and a filter capacitor.
8. The contactless switch of claim 1, wherein: the alternating current output ends are more than one, each alternating current output end is correspondingly provided with a rectifying circuit, and each rectifying circuit is connected with a semiconductor switch circuit and a driving circuit; the switch detection circuit is provided with more than one signal switch, the signal switches correspond to the driving circuits one by one, and the power taking circuit is provided with one.
9. The contactless switch of claim 8, wherein: the switch detection circuit is provided with a touch control chip, and the signal switch is a touch switch.
10. The contactless switch of claim 8, wherein: and each alternating current output end is respectively connected with a load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921289528.XU CN210075183U (en) | 2019-08-09 | 2019-08-09 | Contactless switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921289528.XU CN210075183U (en) | 2019-08-09 | 2019-08-09 | Contactless switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210075183U true CN210075183U (en) | 2020-02-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921289528.XU Active CN210075183U (en) | 2019-08-09 | 2019-08-09 | Contactless switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210075183U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350899A (en) * | 2019-08-09 | 2019-10-18 | 广东福田电器有限公司 | Noncontacting switch |
-
2019
- 2019-08-09 CN CN201921289528.XU patent/CN210075183U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350899A (en) * | 2019-08-09 | 2019-10-18 | 广东福田电器有限公司 | Noncontacting switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Contactless switch Effective date of registration: 20200811 Granted publication date: 20200214 Pledgee: Leliu sub branch of Guangdong Shunde Rural Commercial Bank Co.,Ltd. Pledgor: GUANGDONG FUTINA ELECTRICAL Co.,Ltd. Registration number: Y2020980004874 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230112 Granted publication date: 20200214 Pledgee: Leliu sub branch of Guangdong Shunde Rural Commercial Bank Co.,Ltd. Pledgor: GUANGDONG FUTINA ELECTRICAL Co.,Ltd. Registration number: Y2020980004874 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |