CN204740985U - A relay control circuit for converter - Google Patents
A relay control circuit for converter Download PDFInfo
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- CN204740985U CN204740985U CN201520373508.6U CN201520373508U CN204740985U CN 204740985 U CN204740985 U CN 204740985U CN 201520373508 U CN201520373508 U CN 201520373508U CN 204740985 U CN204740985 U CN 204740985U
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Abstract
The utility model discloses a relay control circuit for converter, include: relay (K1), power supply (1), feedback circuit (2), control circuit (3), switch circuit (4) and low -voltage start power circuit (5), wherein, power supply (1) is connected with feedback circuit (2), and control circuit (3) are connected with feedback circuit (2) and switch circuit (4) respectively, switch circuit (4) with relay (K1) is connected, low -voltage start power circuit (5) are connected with control circuit (3). Implement the beneficial effects of the utility model are that, reduced power supply circuit's load, solved the problem of relay coil's control source, still makeed the high voltage power supply can be applied to relay coil's control, and do not need additionally to increase high frequency switching power supply's load bearing capability.
Description
Technical field
The utility model relates to frequency converter field, more particularly, relates to a kind of control relay circuit for frequency converter.
Background technology
At present, in frequency converter, due to volume restriction, generally all can use small-sized high frequency switch power.But the load capacity of the secondary out-put supply of small-sized high frequency switch power is less, be not enough to control larger relay.If strengthen the load capacity of high frequency switch power, the volume of high frequency transformer will inevitably be caused to increase and then affect the volume of whole product, affecting the production cost of product.
Prior art existing defects, needs to improve.
Utility model content
The technical problems to be solved in the utility model is, for the above-mentioned defect of prior art, provides a kind of control relay circuit for frequency converter.
The utility model solves the technical scheme that its technical problem adopts: construct a kind of control relay circuit for frequency converter, comprise: relay, also comprise: power supply, feedback circuit, control circuit, switching circuit and low-voltage start power circuit;
Wherein, power supply is connected with feedback circuit, and control circuit is connected with feedback circuit and switching circuit respectively; Switching circuit is connected with described relay; Low-voltage starts power circuit and is connected with control circuit;
Described low-voltage starts power circuit and is used for output LOW voltage control signal or high voltage control signal to control the output of described control circuit;
Feedback circuit, for detecting the supply power voltage of power supply, when supply power voltage changes, sends detection signal to described control circuit;
Described control circuit is used for receiving described low-voltage control signal, then according to described detection signal, the on-state rate that output pulse signal controls described switching circuit keeps stable and normal adhesive to make the operating voltage of described relay;
Described control circuit also for receiving described high voltage control signal, then stops output pulse signal to turn off described switching circuit thus to make described relay quit work.
Preferably, described control circuit comprises control chip; Described low-voltage starts power circuit and comprises: triode and switch; The model of described control chip is UC2844;
Wherein, described switch comprises first end and the second end; Second end ground connection of described switch; The first end of described switch is connected with the 4th pin of control chip, and is connected with the 8th pin of control chip through resistance R10;
The base stage of triode is connected with the first end of described switch through resistance R1; The grounded emitter of triode, the collector electrode of triode is connected with the 8th pin of control chip with resistance R9 through resistance R2.
Preferably, described feedback circuit comprises: optocoupler;
Wherein, the anode of the light-emitting diode of optocoupler is connected with the positive pole of power supply through resistance R4; The negative electrode of the light-emitting diode of optocoupler is connected with one end of electric capacity C3; The other end of electric capacity C3 is connected with described relay through resistance R7; Grounded emitter, the collector electrode of the triode of optocoupler are connected with the anode of diode D2; The negative electrode of diode D2 is connected with the collector electrode of triode through resistance R2 respectively and is connected with the 8th pin of control chip through resistance R9.
Preferably, described switching circuit comprises: field effect transistor;
Wherein, the grid of field effect transistor is connected with the 6th pin of control chip through resistance R13, source ground, drain electrode be connected with described relay.
Preferably, described control relay circuit also comprises: the current foldback circuit be connected with described field effect transistor and described control chip;
Described current foldback circuit for detecting the source current of described field effect transistor, and sends to described control chip after being converted into voltage signal;
Described control chip is used for when described voltage signal is higher than predetermined threshold value, exports control signal and ends to make described field effect transistor.
Preferably, described current foldback circuit comprises resistance R12 and resistance R3;
Wherein, one end of resistance R12 is connected with the 3rd pin of control chip, the other end is connected with one end of resistance R3 and the source electrode of field effect transistor; The other end ground connection of resistance R3.
Implement the control relay circuit for frequency converter of the present utility model, there is following beneficial effect: adopt low-voltage start power circuit and relay with the use of, adjustable by the output duty cycle adjusting pulse signal, the operating voltage that relay coil two ends are produced remains on 24V, and then ensure that relay coil normally can work in the range of nominal tension of 35V-130V, not only reduce the load of power circuit, solve the problem of the control power supply of relay coil, also make High Voltage Power Supply can be applied to the control of relay coil, and do not need the load capacity additionally increasing high frequency switch power.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the structured flowchart of the control relay circuit for frequency converter of the utility model embodiment;
Fig. 2 is the circuit structure diagram of the control relay circuit for frequency converter of the utility model embodiment.
Embodiment
In order to there be understanding clearly to technical characteristic of the present utility model, object and effect, now contrast accompanying drawing and describe embodiment of the present utility model in detail.
It is the structured flowchart of the control relay circuit for frequency converter of the utility model embodiment see Fig. 1.The control relay circuit for frequency converter of the utility model embodiment comprises: relay K 1, power supply 1, feedback circuit 2, control circuit 3, switching circuit 4 and low-voltage start power circuit 5.
Wherein, power supply 1 is connected with feedback circuit 2, and control circuit 3 is connected with feedback circuit 2 and switching circuit 4 respectively; Switching circuit 4 is connected with relay K 1; Low-voltage starts power circuit 5 and is connected with control circuit 3.
Low-voltage starts power circuit 5 for output LOW voltage control signal or high voltage control signal to control the output of control circuit 3;
Feedback circuit 2, for detecting the supply power voltage of power supply 1, when supply power voltage changes, sends detection signal to control circuit 3;
Control circuit 3 is for receiving low-voltage control signal, then according to detection signal, the on-state rate of output pulse signal control switch circuit 4 keeps stable and normal adhesive to make the operating voltage of relay K 1; Concrete, control circuit 3, by controlling the output duty cycle of the pulse signal exported, keeps constant voltage to make the operating voltage of the coil of relay K 1.
Control circuit 3 also for receiving high voltage control signal, then stops output pulse signal with shutdown switch circuit 4 thus relay K 1 is quit work.
In embodiment of the present utility model, power supply 1 is direct current 35V-130V power supply.
It is the circuit structure diagram of the control relay circuit for frequency converter of the utility model embodiment see Fig. 2.The control circuit 3 of the utility model embodiment comprises control chip IC1.Low-voltage starts power circuit 5 and comprises: triode Q1 and switch J1.The model of control chip IC1 is UC2844.Feedback circuit 2 comprises: optocoupler O1.Switching circuit 4 comprises: field effect transistor M1.
Wherein, switch J1 comprises first end and the second end; The second end ground connection of switch J1; The first end of switch J1 is connected with the 4th pin of control chip IC1, and is connected with the 8th pin of control chip IC1 through resistance R10; The base stage of triode Q1 is connected with the first end of switch J1 through resistance R1; The grounded emitter of triode Q1, the collector electrode of triode Q1 is connected with the 8th pin of control chip IC1 with resistance R9 through resistance R2.
The anode of the light-emitting diode of optocoupler O1 is connected with the positive pole of power supply 1 through resistance R4; The negative electrode of the light-emitting diode of optocoupler O1 is connected with one end of electric capacity C3; The other end of electric capacity C3 is connected with relay K 1 through resistance R7; Grounded emitter, the collector electrode of the triode of optocoupler O1 are connected with the anode of diode D2; The negative electrode of diode D2 is connected with the collector electrode of triode Q1 through resistance R2 respectively and is connected with the 8th pin of control chip U1 through resistance R9.
The grid of field effect transistor M1 is connected with the 6th pin of control chip U1 through resistance R13, source ground, drain electrode are connected with relay K 1.
See Fig. 2, the control relay circuit of the utility model embodiment also comprises: the current foldback circuit 6 be connected with field effect transistor M1 and control chip IC1.This current foldback circuit 6 for detecting the source current of field effect transistor M1, and sends to control chip U1 after being converted into voltage signal.Control chip U1 is used for when voltage signal is higher than predetermined threshold value, exports control signal and ends to make field effect transistor M1.
Concrete, current foldback circuit 6 comprises resistance R12 and resistance R3.Wherein, one end of resistance R12 is connected with the 3rd pin of control chip IC1, the other end is connected with one end of resistance R3 and the source electrode of field effect transistor M1; The other end ground connection of resistance R3.
Below in conjunction with Fig. 2, the specific works principle of the control relay circuit for frequency converter of the utility model embodiment is illustrated:
Between DC+, DC-after logical upper power supply voltage (direct current 35V-130V voltage), the 7th negative electrode pin (VI negative electrode) input+9V ~+15V direct voltage of control chip IC1.When switch J1 short circuit (i.e. the first end of switch and the second end short circuit), circuit control signal CT is low-voltage control signal (0V), triode Q1 ends, and the input signal of first pin of control chip IC1 is controlled by the optocoupler O1 in feedback circuit 2.Circuit is started working, and control chip IC1 the 6th pin output pulse signal controls field effect transistor M1, and making to there is voltage between DC+ and RLY is direct current+24V, to make the normal adhesive of relay K 1.When voltage between DC+, DC-changes between direct current 35V-130V, control chip IC1 first pin is entered by the optocoupler O1 feedback in feedback circuit, control chip IC1 the 6th pin is made to export pulse adjustment pulsewidth, make between DC+ and RLY, to there is voltage and keep direct current+24V, to make the normal adhesive of relay K 1.
When the first end of switch J1 and the second end not short circuit time, then circuit control signal CT is high voltage control signal (direct current+3V ~+5V), triode Q1 is switched on, the power supply signal of first pin of control chip IC1 is dragged down as low level signal, make the 6th pin no longer output pulse signal of control chip IC1, and then make the pressure reduction between DC+ and RLY be 0V, namely relay coil quits work.
Continue see Fig. 2; the principle of the overcurrent protection of the utility model embodiment is: when the electric current flowing through field effect transistor M1 source electrode increases (such as; too much or other abnormal operating states of relay parallel connection) time; the voltage at resistance R3 two ends increases with this electric current and exceedes predetermined threshold value (such as; 1V); the output of its 6th pin can be turned off after 3rd pin of control chip IC1 detects this voltage; make its no longer output pulse signal; thus field effect transistor M1 quits work, i.e. field effect transistor M1 is turned off, with each device in protection relay control circuit.
The control relay circuit for frequency converter of the utility model embodiment adopt low-voltage start power circuit and relay with the use of, adjustable by the output duty cycle adjusting pulse signal, the operating voltage that relay coil two ends are produced remains on 24V, and then ensure that relay coil normally can work in the range of nominal tension of 35V-130V, not only reduce the load of power circuit, solve the problem of the control power supply of relay coil, also make High Voltage Power Supply can be applied to the control of relay coil, and do not need the load capacity additionally increasing high frequency switch power.
By reference to the accompanying drawings embodiment of the present utility model is described above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing under the ambit that the utility model aim and claim protect, also can make a lot of form, these all belong within protection of the present utility model.
Claims (6)
1. the control relay circuit for frequency converter, comprise: relay (K1), it is characterized in that, also comprise: power supply (1), feedback circuit (2), control circuit (3), switching circuit (4) and low-voltage start power circuit (5);
Wherein, power supply (1) is connected with feedback circuit (2), and control circuit (3) is connected with feedback circuit (2) and switching circuit (4) respectively; Switching circuit (4) is connected with described relay (K1); Low-voltage starts power circuit (5) and is connected with control circuit (3);
Described low-voltage starts power circuit (5) for output LOW voltage control signal or high voltage control signal to control the output of described control circuit (3);
Feedback circuit (2), for detecting the supply power voltage of power supply (1), when supply power voltage changes, sends detection signal to described control circuit (3);
Described control circuit (3) is for receiving described low-voltage control signal, then according to described detection signal, the on-state rate that output pulse signal controls described switching circuit (4) keeps stable and normal adhesive to make the operating voltage of described relay (K1);
Described control circuit (3) also for receiving described high voltage control signal, then stops output pulse signal to turn off described switching circuit (4) thus to make described relay (K1) quit work.
2. control relay circuit according to claim 1, is characterized in that, described control circuit (3) comprises control chip (IC1); Described low-voltage starts power circuit (5) and comprising: triode (Q1) and switch (J1); The model of described control chip (IC1) is UC2844;
Wherein, described switch (J1) comprises first end and the second end; Second end ground connection of described switch (J1); The first end of described switch (J1) is connected with the 4th pin of control chip (IC1), and is connected with the 8th pin of control chip (IC1) through resistance R10;
The base stage of triode (Q1) is connected with the first end of described switch (J1) through resistance R1; The grounded emitter of triode (Q1), the collector electrode of triode (Q1) is connected with the 8th pin of control chip (IC1) with resistance R9 through resistance R2.
3. control relay circuit according to claim 2, is characterized in that, described feedback circuit (2) comprising: optocoupler (O1);
Wherein, the anode of the light-emitting diode of optocoupler (O1) is connected with the positive pole of power supply (1) through resistance R4; The negative electrode of the light-emitting diode of optocoupler (O1) is connected with one end of electric capacity C3; The other end of electric capacity C3 is connected with described relay (K1) through resistance R7; Grounded emitter, the collector electrode of the triode of optocoupler (O1) are connected with the anode of diode D2; The negative electrode of diode D2 is connected with the collector electrode of triode (Q1) through resistance R2 respectively and is connected with the 8th pin of control chip (U1) through resistance R9.
4. control relay circuit according to claim 3, is characterized in that, described switching circuit (4) comprising: field effect transistor (M1);
Wherein, the grid of field effect transistor (M1) is connected with the 6th pin of control chip (U1) through resistance R13, source ground, drain electrode be connected with described relay (K1).
5. control relay circuit according to claim 4, it is characterized in that, described control relay circuit also comprises: the current foldback circuit (6) be connected with described field effect transistor (M1) and described control chip (IC1);
Described current foldback circuit (6) for detecting the source current of described field effect transistor (M1), and sends to described control chip (U1) after being converted into voltage signal;
Described control chip (U1), for when described voltage signal is higher than predetermined threshold value, exports control signal and ends to make described field effect transistor (M1).
6. control relay circuit according to claim 5, is characterized in that, described current foldback circuit (6) comprises resistance R12 and resistance R3;
Wherein, one end of resistance R12 is connected with the 3rd pin of control chip (IC1), the other end is connected with one end of resistance R3 and the source electrode of field effect transistor (M1); The other end ground connection of resistance R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520373508.6U CN204740985U (en) | 2015-06-02 | 2015-06-02 | A relay control circuit for converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520373508.6U CN204740985U (en) | 2015-06-02 | 2015-06-02 | A relay control circuit for converter |
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| Publication Number | Publication Date |
|---|---|
| CN204740985U true CN204740985U (en) | 2015-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520373508.6U Active CN204740985U (en) | 2015-06-02 | 2015-06-02 | A relay control circuit for converter |
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| CN (1) | CN204740985U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107993891A (en) * | 2017-12-31 | 2018-05-04 | 昌辉汽车电气系统（安徽）有限公司 | The protection circuit and method of a kind of relay contact in electric machine control system |
| CN108562851A (en) * | 2018-06-13 | 2018-09-21 | 常州同惠电子股份有限公司 | A kind of switch detection protection circuit |
| CN109545620A (en) * | 2018-11-08 | 2019-03-29 | 青岛海信日立空调系统有限公司 | A kind of the protection circuit and method of relay |
| CN115050610A (en) * | 2022-06-30 | 2022-09-13 | 华帝股份有限公司 | Control circuit of relay and household appliance |
-
2015
- 2015-06-02 CN CN201520373508.6U patent/CN204740985U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107993891A (en) * | 2017-12-31 | 2018-05-04 | 昌辉汽车电气系统（安徽）有限公司 | The protection circuit and method of a kind of relay contact in electric machine control system |
| CN107993891B (en) * | 2017-12-31 | 2024-01-16 | 昌辉汽车电气系统（安徽）有限公司 | Protection circuit and method for relay contact in motor control system |
| CN108562851A (en) * | 2018-06-13 | 2018-09-21 | 常州同惠电子股份有限公司 | A kind of switch detection protection circuit |
| CN109545620A (en) * | 2018-11-08 | 2019-03-29 | 青岛海信日立空调系统有限公司 | A kind of the protection circuit and method of relay |
| CN109545620B (en) * | 2018-11-08 | 2020-02-04 | 青岛海信日立空调系统有限公司 | Protective circuit and method of relay |
| CN115050610A (en) * | 2022-06-30 | 2022-09-13 | 华帝股份有限公司 | Control circuit of relay and household appliance |
| CN115050610B (en) * | 2022-06-30 | 2024-07-09 | 华帝股份有限公司 | Control circuit of relay and household appliance |
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