CN205016421U - Relay switch drive arrangement and domestic appliance - Google Patents
Relay switch drive arrangement and domestic appliance Download PDFInfo
- Publication number
- CN205016421U CN205016421U CN201520606832.8U CN201520606832U CN205016421U CN 205016421 U CN205016421 U CN 205016421U CN 201520606832 U CN201520606832 U CN 201520606832U CN 205016421 U CN205016421 U CN 205016421U
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- relay
- zero cross
- drive circuit
- triode
- circuit
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Abstract
The utility model discloses a relay switch drive arrangement and domestic appliance relates to relay drive technical field, the utility model discloses when well zero cross detection circuit is in zero point at the sinusoidal current of alternating -current power supply signal, to control circuit sends the zero cross signal, and control circuit controls according to the received zero cross signal relay drive circuit, so that relay drive circuit institute driven relay is in the sinusoidal current signal breaks off when being in zero point or is closed, thereby avoids the relay produces when disconnection or closure and draws the arc phenomenon, has prolonged the electrical apparatus life -span of relay, has avoided simultaneously producing electromagnetic interference to the commercial power electric wire netting.
Description
Technical field
The utility model relates to relay Driving technique field, particularly a kind of relay switch drive unit and adopt the household electrical appliance of described relay switch drive unit.
Background technology
Relay is the automatic switch element with isolation features, and being widely used in remote control, remote measurement, communication, automatically control, electromechanical integration and power electronic equipment, is one of most important control element.
But relay disconnects and closed moment, and be very easy to produce contact arc discharge phenomenon, particularly when contact current is larger, this phenomenon can reduce the appliance life of relay greatly, also produces larger electromagnetic interference to utility grid simultaneously.
Utility model content
In view of the above problems, the utility model is proposed to provide a kind of overcoming the problems referred to above or a kind of relay switch drive unit solved the problem at least in part and household electrical appliance.
According to an aspect of the present utility model, provide a kind of relay switch drive unit, described device comprises: the zero cross detection circuit connected successively, control circuit and relay drive circuit,
Described zero cross detection circuit, for when the sinusoidal current signal of alternating-current power supply is in zero point, sends zero cross signal to described control circuit;
Described control circuit, for controlling described relay drive circuit according to the zero cross signal received, the relay driven to make described relay drive circuit carries out disconnecting or closing when described sinusoidal current signal is in zero point.
Alternatively, described control circuit, for determining the time cycle between each zero cross signal according to the zero cross signal received, and controlling described relay drive circuit time of delay according to the action of described time cycle and described relay, the relay driven to make described relay drive circuit carries out disconnecting or closing when described sinusoidal current signal is in zero point.
Alternatively, described relay drive circuit comprises: triode Q151 and diode D151, the grounded emitter of described triode Q151, the base stage of described triode Q151 is connected with described control circuit, the collector electrode of described triode Q151 is connected respectively with the anode of the first control end of described relay and described diode D151, and the negative electrode of described diode D151 is connected with the second control end of the operating voltage of described relay and described relay.
Alternatively, described relay drive circuit also comprises: voltage stabilizing didoe ZD151, described voltage stabilizing didoe ZD151 is located between the anode of described diode D151 and the collector electrode of described triode Q151, the anode of described voltage stabilizing didoe ZD151 is connected with the anode of described diode, and the negative electrode of described voltage stabilizing didoe ZD151 is connected with the collector electrode of described triode Q151.
Alternatively, described relay drive circuit also comprises: the first resistance R1, between the base stage that described first resistance R1 is located at described triode Q151 and described control circuit.
Alternatively, described relay drive circuit also comprises: the second resistance R2, and described second resistance R2 is located between the base stage of described triode Q151 and the emitter of described triode Q151.
Alternatively, described zero cross detection circuit is photoelectric coupling type zero cross detection circuit.
Alternatively, described zero cross detection circuit is the non-isolated zero cross detection circuit of resistance step-down.
According to another aspect of the present utility model, provide a kind of household electrical appliance, the device described in described household electrical appliance.
Alternatively, described household electrical appliance are soy bean milk making machine or insulating pot.
In the utility model, zero cross detection circuit is when the sinusoidal current signal of alternating-current power supply is in zero point, zero cross signal is sent to described control circuit, control circuit controls described relay drive circuit according to the zero cross signal received, the relay driven to make described relay drive circuit carries out disconnecting or closing when described sinusoidal current signal is in zero point, thus avoid described relay disconnect or closed time produce phenomenon of arc discharge, extend the appliance life of relay, avoid simultaneously and electromagnetic interference is produced to utility grid.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the relay switch drive unit of a kind of execution mode of the utility model;
Fig. 2 is the circuit theory diagrams of the relay drive circuit of a kind of embodiment of the utility model.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples for illustration of the utility model, but are not used for limiting scope of the present utility model.
Fig. 1 is the structured flowchart of the relay switch drive unit of a kind of execution mode of the utility model; With reference to Fig. 1, described device comprises: the zero cross detection circuit connected successively, control circuit and relay drive circuit,
Described zero cross detection circuit, for when the sinusoidal current signal of alternating-current power supply is in zero point, sends zero cross signal to described control circuit;
Will be understood that, the sinusoidal current signal of described zero cross detection circuit to described alternating-current power supply detects, when the sinusoidal current signal of alternating-current power supply is in zero point, zero cross signal is sent to described control circuit, described zero cross signal can be regarded as the signal of telecommunication, namely characterized by high level or low level, certainly, when the sinusoidal current signal of described alternating-current power supply is not in zero point, any signal can not be sent, also the signal of telecommunication contrary with described zero cross signal can be sent (if zero cross signal is characterized by high level, the then contrary signal of telecommunication is characterized by low level, if zero cross signal is characterized by low level, then the contrary signal of telecommunication is characterized by high level).
It should be noted that, described alternating-current power supply is generally utility grid, the live wire L namely in figure and zero line N, because sinusoidal current signal is embodied in live wire L usually, so the zero cross detection circuit in Fig. 1 is connected with live wire L.
In specific implementation, described zero cross detection circuit has multiple circuit structure in the prior art, repeat no more in present embodiment, certainly, described zero cross detection circuit optional photoelectric coupling type zero cross detection circuit (namely adopting the zero cross detection circuit of photoelectric coupling principle) or the non-isolated zero cross detection circuit of resistance step-down (namely adopting the zero cross detection circuit of resistance decompression principle).
Described control circuit, for controlling described relay drive circuit according to the zero cross signal received, the relay driven to make described relay drive circuit carries out disconnecting or closing when described sinusoidal current signal is in zero point.
It should be noted that, the circuit that control circuit can adopt electronic devices and components to form, also can adopt and be realized by chips such as single-chip microcomputer, field programmable gate array (FPGA) or CPLDs (CPLD), present embodiment is not limited this.
Will be understood that, if relay does not have action time of delay, then when receiving zero cross signal, directly can control described relay drive circuit, thus making described relay carry out disconnecting or closing.
But consider that relay has the time of delay of 5mS ~ 15mS usually, if when receiving zero cross signal, control described relay drive circuit, when described relay carries out disconnecting or is closed, described sinusoidal current signal is not in zero point, so, in present embodiment, described control circuit, for determining the time cycle between each zero cross signal according to the zero cross signal received, and control described relay drive circuit time of delay according to the action of described time cycle and described relay, the relay driven to make described relay drive circuit carries out disconnecting or closing when described sinusoidal current signal is in zero point.
That is, time cycle due to each zero cross signal is certain, the time cycle between each zero cross signal can be determined according to the zero cross signal received, in addition, because action time of delay of same model is also substantially identical, so, time that described relay drive circuit is controlled can be determined according to the action delay time of described time cycle and relay, such as: the time cycle between each zero cross signal is 50mS, action time of delay of relay is 10mS, and once zero cross signal on receiving before 5mS, then can determine to control described relay drive circuit after 35mS, described relay can be made to carry out disconnecting or closed time, described sinusoidal current signal is just in time in zero point.
In present embodiment, zero cross detection circuit is when the sinusoidal current signal of alternating-current power supply is in zero point, zero cross signal is sent to described control circuit, control circuit controls described relay drive circuit according to the zero cross signal received, the relay driven to make described relay drive circuit carries out disconnecting or closing when described sinusoidal current signal is in zero point, thus avoid described relay disconnect or closed time produce phenomenon of arc discharge, extend the appliance life of relay, avoid simultaneously and electromagnetic interference is produced to utility grid.
Below for a relay with four links so that the utility model to be described, but do not limit protection range of the present utility model.With reference to Fig. 2, four links of described relay K C151 are respectively link 1, link 2, link 3 and link 4, wherein, link 1 and link 2 are the control end of described relay K C151, link 3 is generally used for being connected load circuit with link 4, described relay drive circuit comprises: triode Q151 and diode D151, the emitter E ground connection GND of described triode Q151, the base stage B of described triode Q151 is connected with the drive singal pin REL of described control circuit, the collector electrode C of described triode Q151 is connected respectively with the anode of the link 2 of described relay K C151 and described diode D151, the negative electrode of described diode D151 is connected with the link 1 of the operating voltage VCC of described relay K C151 and described relay K C151.
Will be understood that, diode D151 is mainly in order to protect triode Q151.When in figure, triode Q151 becomes cut-off from conducting, the electric current flowing through relay coil will reduce rapidly, at this moment coil can produce after very high self induction electromotive force superposes with supply voltage and be added in the collector electrode C of triode Q151 and two interpolars of emitter E, triode Q151 can be made to puncture, in parallel connection after diode D151, can by the forward conduction voltage of the self induction electromotive force clamper of relay coil in diode D151, thus avoid puncturing triode Q151.
It should be noted that, triode Q151 can select band built-in resistor or the triode not with built-in resistor.
Self induction electromotive force due to described relay coil can extend described relay K C151 disconnect or closed time time, for avoiding this problem, in present embodiment, described relay drive circuit also comprises: voltage stabilizing didoe ZD151, described voltage stabilizing didoe ZD151 is located between the anode of described diode D151 and the collector electrode of described triode Q151, the anode of described voltage stabilizing didoe ZD151 is connected with the anode of described diode, and the negative electrode of described voltage stabilizing didoe ZD151 is connected with the collector electrode of described triode Q151.
Resistance R1 mainly plays metering function, and reduce transistor T1 power consumption, resistance is 2K Ω.Resistance R2 makes transistor T1 reliably end, and resistance is 5.1K Ω.
For reducing the power consumption of triode Q151, in present embodiment, described relay drive circuit also comprises: the first resistance R1, between the base stage that described first resistance R1 is located at described triode Q151 and described control circuit.
For making described triode Q151 reliably end, in present embodiment, described relay drive circuit also comprises: the second resistance R2, and described second resistance R2 is located between the base stage of described triode Q151 and the emitter of described triode Q151.
The invention also discloses a kind of household electrical appliance adopting described relay switch drive unit, certainly, described household electrical appliance be soy bean milk making machine, insulating pot etc. other need to use the household electrical appliance of relay.
Above execution mode is only for illustration of the utility model; and be not limitation of the utility model; the those of ordinary skill of relevant technical field; when not departing from spirit and scope of the present utility model; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present utility model, and scope of patent protection of the present utility model should be defined by the claims.
Claims (10)
1. a relay switch drive unit, is characterized in that, described device comprises: the zero cross detection circuit connected successively, control circuit and relay drive circuit,
Described zero cross detection circuit, for when the sinusoidal current signal of alternating-current power supply is in zero point, sends zero cross signal to described control circuit;
Described control circuit, for controlling described relay drive circuit according to the zero cross signal received, the relay driven to make described relay drive circuit carries out disconnecting or closing when described sinusoidal current signal is in zero point.
2. device as claimed in claim 1, it is characterized in that, described control circuit, for determining the time cycle between each zero cross signal according to the zero cross signal received, and controlling described relay drive circuit time of delay according to the action of described time cycle and described relay, the relay driven to make described relay drive circuit carries out disconnecting or closing when described sinusoidal current signal is in zero point.
3. device as claimed in claim 1, it is characterized in that, described relay drive circuit comprises: triode Q151 and diode D151, the grounded emitter of described triode Q151, the base stage of described triode Q151 is connected with described control circuit, the collector electrode of described triode Q151 is connected respectively with the anode of the first control end of described relay and described diode D151, and the negative electrode of described diode D151 is connected with the second control end of the operating voltage of described relay and described relay.
4. device as claimed in claim 3, it is characterized in that, described relay drive circuit also comprises: voltage stabilizing didoe ZD151, described voltage stabilizing didoe ZD151 is located between the anode of described diode D151 and the collector electrode of described triode Q151, the anode of described voltage stabilizing didoe ZD151 is connected with the anode of described diode, and the negative electrode of described voltage stabilizing didoe ZD151 is connected with the collector electrode of described triode Q151.
5. device as claimed in claim 4, it is characterized in that, described relay drive circuit also comprises: the first resistance R1, between the base stage that described first resistance R1 is located at described triode Q151 and described control circuit.
6. device as claimed in claim 5, it is characterized in that, described relay drive circuit also comprises: the second resistance R2, and described second resistance R2 is located between the base stage of described triode Q151 and the emitter of described triode Q151.
7. the device according to any one of claim 1 ~ 6, is characterized in that, described zero cross detection circuit is photoelectric coupling type zero cross detection circuit.
8. the device according to any one of claim 1 ~ 6, is characterized in that, described zero cross detection circuit is the non-isolated zero cross detection circuit of resistance step-down.
9. household electrical appliance, is characterized in that, described household electrical appliance comprise the device according to any one of claim 1 ~ 8.
10. household electrical appliance as claimed in claim 9, it is characterized in that, described household electrical appliance are soy bean milk making machine or insulating pot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520606832.8U CN205016421U (en) | 2015-08-12 | 2015-08-12 | Relay switch drive arrangement and domestic appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520606832.8U CN205016421U (en) | 2015-08-12 | 2015-08-12 | Relay switch drive arrangement and domestic appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205016421U true CN205016421U (en) | 2016-02-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520606832.8U Expired - Fee Related CN205016421U (en) | 2015-08-12 | 2015-08-12 | Relay switch drive arrangement and domestic appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205016421U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094958A (en) * | 2016-06-07 | 2016-11-09 | 浙江腾腾电气有限公司 | A kind of self adaptation being applied on manostat is reduced internal heat arc means of relay controlling |
| CN108448532A (en) * | 2018-04-24 | 2018-08-24 | 广东华美骏达电器有限公司 | A kind of relay zero-crossing control circuit |
| CN109292561A (en) * | 2017-07-25 | 2019-02-01 | 江苏科技大学 | A kind of circuit and implementation method to be opened the door based on the POS and call elevator and illumination |
-
2015
- 2015-08-12 CN CN201520606832.8U patent/CN205016421U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094958A (en) * | 2016-06-07 | 2016-11-09 | 浙江腾腾电气有限公司 | A kind of self adaptation being applied on manostat is reduced internal heat arc means of relay controlling |
| CN109292561A (en) * | 2017-07-25 | 2019-02-01 | 江苏科技大学 | A kind of circuit and implementation method to be opened the door based on the POS and call elevator and illumination |
| CN108448532A (en) * | 2018-04-24 | 2018-08-24 | 广东华美骏达电器有限公司 | A kind of relay zero-crossing control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20160203 |