CN204257515U - Control relay circuit - Google Patents
Control relay circuit Download PDFInfo
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- CN204257515U CN204257515U CN201420616749.4U CN201420616749U CN204257515U CN 204257515 U CN204257515 U CN 204257515U CN 201420616749 U CN201420616749 U CN 201420616749U CN 204257515 U CN204257515 U CN 204257515U
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Abstract
The utility model relates to a kind of control relay circuit, it comprises a power supply, and controls power supply, a relay, low-voltage startup power circuit and a feedback circuit, and power supply exports the two ends of a direct voltage to relay coil to produce the operating voltage of relay; Control power supply and export a control voltage starts power circuit input to low-voltage, when reaching a starting resistor with the input voltage making low-voltage start power circuit, its output exports a pulse signal; When the direct voltage of power supply changes, feedback circuit detects this change and feeds back to the comparison input that low-voltage starts power circuit, and then by adjusting the output duty cycle of pulse signal, make the operating voltage of relay remain on a constant range.The utility model not only solves the problem of the control power supply of relay coil, and does not need the load capacity additionally increasing high frequency switch power.
Description
Technical field
The utility model relates to Control field, particularly relates to a kind of control relay circuit.
Background technology
At present, in the inverter of 20V-140V direct current supply, owing to employing small-sized high frequency switch power, the load capacity of its secondary out-put supply is less, is not enough to the relay controlling to use in inverter major loop.If strengthen the load capacity of high frequency switch power, the volume of high frequency transformer will inevitably be caused to increase, cause whole power circuit needs to take larger PCB space, thus affect the volume of whole product, affect the production cost of product.
Utility model content
The purpose of this utility model is to provide a kind of control relay circuit, and the load capacity for solving prior art medium-high frequency Switching Power Supply is less is not enough to the problem controlling the relay used in inverter major loop.
For achieving the above object, the technical scheme that the utility model proposes is:
A kind of control relay circuit of the present utility model comprises: a power supply, controls power supply, a relay, low-voltage startup power circuit and a feedback circuit, wherein, described power supply exports the two ends of a direct voltage to relay coil to produce the operating voltage of relay; Described control power supply exports a control voltage starts power circuit input to low-voltage, and when reaching a starting resistor with the input voltage making low-voltage start power circuit, its output exports a pulse signal; When the direct voltage of described power supply changes, described feedback circuit detects this change and feeds back to the comparison input that low-voltage starts power circuit, and then by adjusting the output duty cycle of pulse signal, make the operating voltage of relay remain on a constant range.
Further, described feedback circuit comprises an optical coupler, and the input of this optical coupler is connected respectively with the two ends of described relay coil, and the comparison input that its output and described low-voltage start power circuit is connected.
Further, the operating voltage of described relay remains on 11V.
Further, described control relay circuit also comprises a control circuit, this control circuit comprises a triode be connected respectively with the comparison input that the adhesive control input end of relay, described low-voltage start power circuit, wherein, when the adhesive control input end of described relay is unsettled or its input signal is a high level signal, described triode is switched on, the input signal that described low-voltage starts the comparison input of power circuit is a low level signal, and relay is quit work; When the input signal of the adhesive control input end of described relay is a low level signal, described triode is disconnected, and the input signal that described low-voltage starts the comparison input of power circuit is controlled by feedback circuit.
Further, described control relay circuit also comprises a protective circuit, this protective circuit comprises a resistance and a metal-oxide-semiconductor, described resistance be connected to metal-oxide-semiconductor source electrode and ground hold between, the output that metal-oxide-semiconductor grid starts power circuit with described low-voltage is connected, metal-oxide-semiconductor drain electrode is connected with one end of relay coil, wherein, when the electric current flowing through metal-oxide-semiconductor source electrode increases, the voltage at resistance two ends increase with this electric current and more than a threshold value time, low-voltage starts after the sheet of power circuit selects input this voltage to be detected and turns off its output, thus shutoff metal-oxide-semiconductor, with the device in protection relay control circuit.
Further, described control relay circuit also comprises a filtering freewheeling circuit, this filtering freewheeling circuit comprises a diode, the negative pole of this diode is connected respectively with the other end of the positive pole of power supply, described relay coil, its positive pole drains with described metal-oxide-semiconductor, one end of described relay coil is connected respectively, wherein, when metal-oxide-semiconductor is turned off, by the afterflow of this diode, the operating voltage of relay is made to remain on constant range.
Further, the scope of described threshold value is for being not less than 1V.
Further, the scope of described starting resistor is 7.8V-9V.
Further, the scope of the direct voltage of described power supply is 20V-140V.
Further, the control voltage of described control power supply is 12V.
Compared with prior art, control relay circuit of the present utility model, there is following beneficial effect: the utility model is by processing the voltage of inverter major loop, it is made to be applicable to control relay coil, reduce the load of power circuit, not only solve the problem of the control power supply of relay coil, and do not need the load capacity additionally increasing high frequency switch power.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of control relay circuit of the present utility model.
Embodiment
Below with reference to accompanying drawing, elaboration is further given to the utility model.
Refer to Fig. 1, a kind of control relay circuit that the utility model provides comprises a power supply, and controls power supply, a relay, low-voltage startup power circuit and a feedback circuit.Wherein, when the direct voltage that power supply exports changes, feedback circuit detects this change and feeds back to low-voltage and starts power circuit, and then the output duty cycle of the pulse signal that power circuit exports is started by adjustment low-voltage, remain on a constant range to make the operating voltage of relay.
Particularly, low-voltage starts power circuit and comprises the 7th terminal input VI, the 6th terminal output VOUT, the first terminal compares input COMP, the 3rd terminal plate selects input CS and is connected with ground end Five-terminals GND.In one embodiment, low-voltage starts power circuit can be cured as a hardware chip, and the low-voltage of such as TI company starts power supply chip IC1, to reduce costs further.
Power supply comprises a positive pole P1 and a negative pole, and its positive pole is connected with the other end P+ of relay coil, one end RELAY of negative pole and relay coil, hold and be connected respectively.This power supply is for exporting the direct voltage of a scope at 20V-140V to two ends RELAY and P of relay coil
+, to produce the operating voltage of relay.
Control power supply and comprise a positive pole and a negative pole, the 7th terminal input VI that its positive pole and low-voltage start power circuit is connected, and the negative pole of negative pole and power supply is held altogether.This control power supply exports a control voltage starts power circuit the 7th terminal input VI to low-voltage, and when reaching a starting resistor with the input voltage making low-voltage start power circuit, its 6th terminal output VOUT exports a pulse signal.In one embodiment, starting resistor is 8.4V, and the control voltage controlling power supply is 12V.Certainly, in other embodiments, the scope of starting resistor also can be between 7.8V-9V.
Feedback circuit comprises an optical coupler O1, the input of this optical coupler O1 and two ends RELAY and P of relay coil
+connect respectively, the first terminal that its output and low-voltage start power circuit compares input COMP and is connected.In one embodiment, between the input of this optical coupler O1 and one end RELAY of relay coil, be connected with a transient diode REF1, with the other end P of relay coil
+between be connected with a resistance R4.When the direct voltage of power supply changes, the input of optical coupler O1 two ends RELAY and P of relay coil by being connected respectively with power supply both positive and negative polarity
+this change detected, the first terminal that this change is fed back to low-voltage startup power circuit by its output compares input COMP, and then the output duty cycle of the pulse signal of the 6th terminal output VOUT output of power circuit is started by adjusting low-voltage, make two ends RELAY and the P of relay coil
+between pressure reduction and the operating voltage of relay remain on a constant range, such as, make this operating voltage remain on 11V.
Further, this control relay circuit also comprises a control circuit, this control circuit comprises a triode N2, triode N2 base stage is connected with the adhesive control input end R/S of relay, triode N2 emitter is held with ground and is connected, the first terminal that triode N2 collector electrode and low-voltage start power circuit compares between input COMP and is connected with a diode D2, is also connected with and a resistance R101 between the negative pole of diode D2 and triode N2 collector electrode.Wherein, when the adhesive control input end R/S of relay is unsettled or its input signal is a high level signal 1, triode N2 is switched on, by resistance R101 and diode D2, it is a low level signal 0 that low-voltage starts that input signal that the first terminal of power circuit compares input COMP dragged down, make low-voltage start the 6th terminal output VOUT no longer output pulse signal of power circuit, and then make two ends RELAY and the P of relay coil
+between pressure reduction and the operating voltage of relay be 0V, namely relay coil quits work.When the input signal of the adhesive control input end R/S of relay is a low level signal 0, triode N2 is disconnected, the first terminal making low-voltage start power circuit compares the control of the no longer controlled circuit of input signal of input COMP, and is controlled by the optical coupler O1 in feedback circuit.
This control relay circuit also comprises a protective circuit; this protective circuit comprises an a resistance R14 and metal-oxide-semiconductor M1; resistance R14 be connected to metal-oxide-semiconductor M1 source electrode and ground hold between; the 6th terminal output VOUT that metal-oxide-semiconductor M1 grid and low-voltage start power circuit is connected by a resistance R13, and metal-oxide-semiconductor M1 drain electrode is connected with one end RELAY of relay coil.Wherein, when the electric current flowing through metal-oxide-semiconductor M1 source electrode increases; such as relay parallel connection too much or other abnormal operating states time; the voltage at resistance R14 two ends increase with this electric current and more than a threshold value time; low-voltage starts after the 3rd terminal plate of power circuit selects input CS this voltage to be detected and turns off its 6th terminal output VOUT; make its no longer output pulse signal, thus metal-oxide-semiconductor M1 quits work, i.e. metal-oxide-semiconductor M1 is turned off, with each device in protection relay control circuit.Preferably, the scope of threshold value is for being not less than 1V.
This control relay circuit also comprises a filtering freewheeling circuit, and this filtering freewheeling circuit comprises a diode D3, the other end P of the negative pole of this diode D3 and the positive pole P1 of power supply, relay coil
+connect respectively, its positive pole drains with metal-oxide-semiconductor M1, one end RELAY of relay coil is connected respectively.In one embodiment, the negative pole of this diode D3 also can be connected with one end of an inductance L 1, the other end of inductance L 1 is then connected with electric capacity E5, electric capacity E6 respectively, and electric capacity E5 drains with metal-oxide-semiconductor M1 with after electric capacity E6 parallel connection, one end RELAY of relay coil is connected respectively.Wherein, when metal-oxide-semiconductor M1 is turned off, by the afterflow effect of diode D3, make two ends RELAY and the P of relay coil
+between pressure reduction and the operating voltage of relay remain on a constant range, even if also have a comparatively smooth direct voltage therebetween for relay coil.
In sum, control relay circuit of the present utility model is a kind of adjustable control relay circuit of output duty cycle of pulse signal, this control relay circuit by adopt low-voltage start power circuit and relay with the use of, the operating voltage that relay coil two ends are produced remains on 11V, and then ensure that relay coil normally can work in the range of nominal tension of 20V-140V, not only reduce the load of power circuit, solve the problem of the control power supply of relay coil, also make high-voltage system can be applied to the control of relay coil, and do not need the load capacity additionally increasing high frequency switch power.
Foregoing; be only preferred embodiment of the present utility model; not for limiting embodiment of the present utility model; those of ordinary skill in the art are according to central scope of the present utility model and spirit; can carry out corresponding flexible or amendment very easily, therefore protection range of the present utility model should be as the criterion with the protection range required by claims.
Claims (10)
1. a control relay circuit, it is characterized in that, comprise: a power supply, controls power supply, a relay, low-voltage startup power circuit and a feedback circuit, and wherein, described power supply exports the two ends of a direct voltage to relay coil to produce the operating voltage of relay; Described control power supply exports a control voltage starts power circuit input to low-voltage, and when reaching a starting resistor with the input voltage making low-voltage start power circuit, its output exports a pulse signal; When the direct voltage of described power supply changes, described feedback circuit detects this change and feeds back to the comparison input that low-voltage starts power circuit, and then by adjusting the output duty cycle of pulse signal, make the operating voltage of relay remain on a constant range.
2. control relay circuit as claimed in claim 1, it is characterized in that, described feedback circuit comprises an optical coupler, and the input of this optical coupler is connected respectively with the two ends of described relay coil, and the comparison input that its output and described low-voltage start power circuit is connected.
3. control relay circuit as claimed in claim 1, it is characterized in that, the operating voltage of described relay remains on 11V.
4. control relay circuit as claimed in claim 1, it is characterized in that, also comprise a control circuit, this control circuit comprises a triode be connected respectively with the comparison input that the adhesive control input end of relay, described low-voltage start power circuit, wherein, when the adhesive control input end of described relay is unsettled or its input signal is a high level signal, described triode is switched on, the input signal that described low-voltage starts the comparison input of power circuit is a low level signal, and relay is quit work; When the input signal of the adhesive control input end of described relay is a low level signal, described triode is disconnected, and the input signal that described low-voltage starts the comparison input of power circuit is controlled by feedback circuit.
5. control relay circuit as claimed in claim 1, it is characterized in that, also comprise a protective circuit, this protective circuit comprises a resistance and a metal-oxide-semiconductor, described resistance be connected to metal-oxide-semiconductor source electrode and ground hold between, the output that metal-oxide-semiconductor grid starts power circuit with described low-voltage is connected, metal-oxide-semiconductor drain electrode is connected with one end of relay coil, wherein, when the electric current flowing through metal-oxide-semiconductor source electrode increases, the voltage at resistance two ends increase with this electric current and more than a threshold value time, low-voltage starts after the sheet of power circuit selects input this voltage to be detected and turns off its output, thus shutoff metal-oxide-semiconductor, with the device in protection relay control circuit.
6. control relay circuit as claimed in claim 5, it is characterized in that, also comprise a filtering freewheeling circuit, this filtering freewheeling circuit comprises a diode, and the negative pole of this diode is connected respectively with the other end of the positive pole of power supply, described relay coil, and its positive pole drains with described metal-oxide-semiconductor, one end of described relay coil is connected respectively, wherein, when metal-oxide-semiconductor is turned off, by the afterflow of this diode, the operating voltage of relay is made to remain on constant range.
7. control relay circuit as claimed in claim 5, it is characterized in that, the scope of described threshold value is for being not less than 1V.
8. control relay circuit as claimed in claim 1, it is characterized in that, the scope of described starting resistor is 7.8V-9V.
9. control relay circuit as claimed in claim 1, it is characterized in that, the scope of the direct voltage of described power supply is 20V-140V.
10. control relay circuit as claimed in claim 1, it is characterized in that, the control voltage of described control power supply is 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420616749.4U CN204257515U (en) | 2014-10-23 | 2014-10-23 | Control relay circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420616749.4U CN204257515U (en) | 2014-10-23 | 2014-10-23 | Control relay circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204257515U true CN204257515U (en) | 2015-04-08 |
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ID=52961793
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420616749.4U Active CN204257515U (en) | 2014-10-23 | 2014-10-23 | Control relay circuit |
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| CN (1) | CN204257515U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591281A (en) * | 2017-09-04 | 2018-01-16 | 珠海格力电器股份有限公司 | Relay decompression keeps control circuit and control method |
| CN107768196A (en) * | 2017-11-30 | 2018-03-06 | 惠州市蓝微新源技术有限公司 | A kind of control system for reducing relay power consumption |
| CN108282113A (en) * | 2018-03-13 | 2018-07-13 | 厦门宏发电声股份有限公司 | A kind of electric motor starting banked relay device |
| CN110286620A (en) * | 2019-06-15 | 2019-09-27 | 深圳市瑞鼎电子有限公司 | Electric control device on-off control method thereof, storage medium, control device and relay |
| CN110379676A (en) * | 2019-08-13 | 2019-10-25 | 南京雁展科技有限公司 | A kind of vehicle-mounted relay energy-saving control circuit of protection with voltage |
-
2014
- 2014-10-23 CN CN201420616749.4U patent/CN204257515U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591281A (en) * | 2017-09-04 | 2018-01-16 | 珠海格力电器股份有限公司 | Relay decompression keeps control circuit and control method |
| CN107768196A (en) * | 2017-11-30 | 2018-03-06 | 惠州市蓝微新源技术有限公司 | A kind of control system for reducing relay power consumption |
| CN108282113A (en) * | 2018-03-13 | 2018-07-13 | 厦门宏发电声股份有限公司 | A kind of electric motor starting banked relay device |
| CN108282113B (en) * | 2018-03-13 | 2023-11-03 | 厦门宏发电声股份有限公司 | Motor starting combined relay device |
| CN110286620A (en) * | 2019-06-15 | 2019-09-27 | 深圳市瑞鼎电子有限公司 | Electric control device on-off control method thereof, storage medium, control device and relay |
| CN110379676A (en) * | 2019-08-13 | 2019-10-25 | 南京雁展科技有限公司 | A kind of vehicle-mounted relay energy-saving control circuit of protection with voltage |
| CN110379676B (en) * | 2019-08-13 | 2024-04-26 | 南京雁展科技有限公司 | Vehicle-mounted relay energy-saving control circuit with voltage protection |
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