CN111403236B - Relay control circuit and relay - Google Patents
Relay control circuit and relay Download PDFInfo
- Publication number
- CN111403236B CN111403236B CN202010186619.1A CN202010186619A CN111403236B CN 111403236 B CN111403236 B CN 111403236B CN 202010186619 A CN202010186619 A CN 202010186619A CN 111403236 B CN111403236 B CN 111403236B
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- Prior art keywords
- control circuit
- circuit
- relay
- output
- power supply
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
- H01H47/32—Energising current supplied by semiconductor device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H2047/025—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay with taking into account of the thermal influences, e.g. change in resistivity of the coil or being adapted to high temperatures
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- Relay Circuits (AREA)
Abstract
The invention discloses a relay control circuit and a relay, wherein the relay control circuit comprises a power supply conversion module, a single-side wave trigger circuit, an operational amplifier control circuit and a current sampling circuit, wherein the output end of the power supply conversion module is connected with a relay coil, the current sampling circuit is used for sampling the magnitude of current flowing through the relay coil, the output end of the single-side wave trigger circuit and the output end of the current sampling circuit are respectively connected with two input ends of the operational amplifier control circuit, the output end of the operational amplifier control circuit is connected with a feedback pin of the power supply conversion module, and the operational amplifier control circuit is used for carrying out the following operations on an output signal of the single-side wave trigger circuit and a sampling signal of the current sampling circuit and then outputting the output signals: vOUT＝k1Vs‑k2Vin. The invention has the advantages of avoiding serious heating of the relay and having high reliability; the power is low, and the energy is saved; the output current is accurately controlled, and the reliability is high; wide pressure input, and can deal with various complex environments.
Description
Technical Field
The invention belongs to the technical field of relays, and particularly relates to a relay control circuit and a relay.
Background
The relay is an automatic switch element with an isolation function, is widely applied to remote control, remote measurement, communication, automatic control, electromechanical integration and power electronic equipment, and is one of the most important control elements.
According to the load of the relay, the relay can be divided into a micro-power relay, a weak-power relay, a medium-power relay and a high-power relay. The high-power relay needs larger voltage or current at the moment of attracting, but the required holding current after attracting does not need to be very large. However, what current relay control circuit adopted is that fixed voltage supplies power, in order to realize the actuation, fixed voltage is than higher, and relay coil resistance is unchangeable usually, and after the actuation, the relay coil will maintain heavy current always, and its defect that exists is: 1. the relay generates heat seriously, which affects the reliability; 2. the relay coil keeps large current, so that energy is wasted due to large power; 3. the output current is not controllable; 4. the input voltage is fixed, and the voltage variable range is smaller.
Disclosure of Invention
The invention aims to provide a relay control circuit and a relay to solve the technical problems.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a relay control circuit, includes power conversion module, folk prescription trigger circuit, fortune control circuit and current sampling circuit, power conversion module's output is used for connecing the relay coil, for the relay coil power supply, current sampling circuit is used for the current size that the relay coil was flowed through in the sampling, the output of folk prescription trigger circuit and current sampling circuit's output connect respectively fortune to put control circuit's two inputs, fortune control circuit's output connection power conversion module's feedback foot, fortune is put control circuit and is used for carrying out following operation to the output signal of folk prescription trigger circuit and current sampling circuit's sampling signal and export:
VOUT＝k1Vs-k2Vin
wherein, VOUTIs the voltage value, V, of the output signal of the operational amplifier control circuitsIs the voltage value, V, of the sampled signal of the current sampling circuitinIs the voltage value, k, of the output signal of the one-way wave trigger circuit1And k2Is a constant.
Further, the relay further comprises a disconnection circuit which is arranged in the loop of the relay coil in series and is configured to be turned off when the power supply is disconnected.
Furthermore, the disconnection circuit is provided with an RC absorption loop.
Further, the power conversion module is a BUCK circuit composed of a DC-DC power chip U1, an energy storage inductor L1 and a freewheeling diode D2, and a feedback pin of the DC-DC power chip U1 is connected to an output end of the operational amplifier control circuit.
Furthermore, the model of the DC-DC power supply chip U1 is TPS 54140.
Furthermore, the single-wave trigger circuit is composed of a PNP triode Q2.
Furthermore, the single-wave trigger circuit further comprises a voltage-regulator tube ZD2, an emitter series resistor R7 of the PNP triode Q2 is connected with the input end of the power supply, one path of a base of the PNP triode Q2 is grounded through a resistor R9 and a capacitor C3 which are connected in series, one path of the base is connected with the negative end of the voltage-regulator tube ZD2 and the emitter of the PNP triode Q2 through the resistor R10, the positive end of the voltage-regulator tube ZD2 is grounded, a collector series resistor R6 of the PNP triode Q2 is connected with the input end of the amplifier control circuit, and an emitter series resistor R5 of the PNP triode Q2 is connected with the collector of the PNP triode Q2.
Further, the operational amplifier control circuit is composed of an operational amplifier U2.
Furthermore, the model of the operational amplifier U2 is TLV 171-Q1.
Further, the current sampling circuit comprises a sampling resistor R4, and the sampling resistor R4 is connected in series in a loop of the relay coil.
The invention also provides a relay which is provided with the relay control circuit.
The invention has the beneficial technical effects that:
the invention realizes that the relay provides large current in the attracting process, maintains stable small current after attracting and reduces power, thereby avoiding serious heating of the relay and influencing reliability; the power is lower, energy-conservation. In addition, the output current of the invention is accurately controlled, and the reliability is high; the wide-pressure input is provided, and various complex environments can be dealt with.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings may be obtained based on these drawings without creative efforts.
FIG. 1 is a circuit diagram of a first embodiment of the present invention;
fig. 2 is a circuit diagram of a second embodiment of the invention.
Detailed Description
To further illustrate the various embodiments, the present invention provides the accompanying figures. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. The components in the drawings are not necessarily to scale, and similar reference numerals are generally used to identify similar components.
The invention will now be further described with reference to the drawings and the detailed description.
Example one
As shown in fig. 1, a relay control circuit includes a power conversion module 1, a single-side wave trigger circuit 2, an operational amplifier control circuit 3, and a current sampling circuit 4, where an output end Coil1 and an output end Coil2 of the power conversion module 1 are used for connecting to a relay Coil (not shown in the figure) to supply power to the relay Coil, the current sampling circuit 4 is used for sampling a current flowing through the relay Coil and converting the current into a voltage for output, an output end of the single-side wave trigger circuit 2 and an output end of the current sampling circuit 4 are respectively connected to two input ends of the operational amplifier control circuit 3, an output end of the operational amplifier control circuit 3 is connected to a feedback pin VSNS of the power conversion module 1, and the operational amplifier control circuit 3 is used for outputting an output signal of the single-side wave trigger circuit 2 and a sampling signal of the current sampling circuit 4 after performing the following operations:
VOUT＝k1Vs-k2Vin
wherein, VOUTIs the voltage value, V, of the output signal of the operational amplifier control circuit 3sIs the voltage value, V, of the sampling signal of the current sampling circuit 4inIs the voltage value, k, of the output signal of the one-side wave trigger circuit 21And k2Is a constant.
In this embodiment, the power conversion module 1 is a BUCK circuit composed of a DC-DC power chip U1, an energy storage inductor L1, and a freewheeling diode D2, a feedback pin VSNS of the DC-DC power chip U1 is connected to an output end of the operational amplifier control circuit 3, and the BUCK circuit is adopted, so that the efficiency of the circuit is higher, and the input voltage can be wider. Of course, in some embodiments, the power conversion circuit 1 may also adopt other existing power conversion circuits, such as a BOOST circuit, which can be easily implemented by those skilled in the art and will not be described in detail.
Preferably, in this specific embodiment, the model of the DC-DC power chip U1 is TPS54140, and the input voltage range is: 3.5V to 42V, with wide voltage input, can deal with various complex environments, and has better performance, but not limited to this, in some embodiments, the DC-DC power chip U1 may also be implemented by using other types of DC-DC power chips.
Preferably, in this embodiment, the output end of the power conversion module 1 is further provided with a filter capacitor C1, so as to filter the output current of the power conversion module 1, and improve stability. The detailed circuit of the power conversion module 1 of the present embodiment is shown in fig. 1, and will not be described in detail.
In this embodiment, the single-side wave trigger circuit 2 is composed of a PNP transistor Q2, specifically, an emitter series resistor R7 of the PNP transistor Q2 is connected to +12V of the input terminal of the power supply, one way of a base of the PNP transistor Q2 is grounded through a resistor R9 and a capacitor C3 which are connected in series, one way of the base is connected to an emitter of the PNP transistor Q2 through the resistor R10, a collector series resistor R6 of the PNP transistor Q2 is connected to the input terminal of the operational amplifier control circuit 3, an emitter series resistor R5 of the PNP transistor Q2 is connected to a collector of a PNP transistor Q2, and more specifically, the circuit connection is shown in fig. 1. The circuit structure is simple in structure, easy to implement, and low in cost, but not limited to this, and in other embodiments, the single-side wave trigger circuit 2 may also be implemented by using other existing single-side wave trigger circuits, which can be easily implemented by those skilled in the art and will not be described in detail.
Further, in this embodiment, the unilateral wave trigger circuit 2 further includes a voltage regulator ZD2, a negative terminal of the voltage regulator ZD2 is connected to an emitter of the PNP triode Q2, and a positive terminal of the voltage regulator ZD2 is grounded, so that the stability of the unilateral wave signal can be improved by setting the voltage regulator ZD2, and the voltage of the unilateral wave signal can be adjusted by adjusting the voltage of the voltage regulator ZD2, which is better in applicability and more flexible and convenient to use.
In this embodiment, the operational amplifier control circuit 3 is composed of an operational amplifier U2, and is preferably implemented by using an operational amplifier U2 with a model number TLV171-Q1, and is powered by a single power supply, so that the circuit structure is simple, the implementation is easy, and the power consumption is low, but not limited thereto, and in other embodiments, the operational amplifier U2 may also be implemented by using other existing operational amplifiers.
The specific circuit structure of the operational amplifier control circuit 3 in this embodiment is shown in fig. 1, and it is not described in detail that the circuit structure is simple, easy to implement, and stable in performance, and in other embodiments, the operational amplifier control circuit 3 may also be implemented in other circuit structures, only V needs to be satisfiedOUT＝k1Vs-k2VinThe relationship (c) is that which can be easily implemented by those skilled in the art and will not be described in detail.
In this embodiment, the current sampling circuit 4 includes a sampling resistor R4, the sampling resistor R4 is connected in series in a loop of the relay coil, and please refer to fig. 1 for a specific circuit connection relationship. By adopting the current sampling circuit 4, the circuit structure is simple, the number of components is small, the implementation is easy, the cost is low, but the limit is not limited to the above.
In this embodiment, the resistance of the sampling resistor R4 is 0.2 Ω, but in other embodiments, the resistance of the sampling resistor R4 may be set according to actual needs, which can be easily implemented by those skilled in the art and will not be described in detail.
The working principle is as follows:
when a power supply is powered on, the single-side wave trigger circuit 2 works to send a high-level signal of 200ms (the high-level time can be adjusted according to actual needs), the high-level signal and a sampling signal of the current sampling circuit 4 are amplified by the operational amplifier control circuit 3 and then output to a feedback pin VSNS of the DC-DC power supply chip U1, and the DC-DC power supply chip U1 is controlled to output a large current of 200ms (2A in the embodiment) to drive a relay to be reliably closed; after the single-wave trigger circuit 2 sends a high level, a low level is continuously output, the low level signal and a sampling signal of the current sampling circuit 4 are output to a feedback pin VSNS of the DC-DC power supply chip U1 after being amplified by the operational amplifier control circuit 3, the DC-DC power supply chip U1 is controlled to output a stable small current (0.4A in the embodiment) to flow through a relay coil, the electromagnetic effect is maintained, and the relay is continuously attracted, so that the effects of high-reliability attraction and energy conservation are realized.
Example two
As shown in fig. 2, the differences between the present embodiment and the first embodiment are: the present embodiment further includes an open circuit 5, which is provided in series in the loop of the relay coil 5, and is configured such that when the power supply is disconnected, the open circuit 5 is turned off.
In this embodiment, the disconnection circuit 5 is implemented by using an NMOS transistor Q1, and includes an NMOS transistor Q1, a resistor R1, a resistor R3, and a voltage regulator ZD1, and specific circuit connection relationships are shown in fig. 2, which are not described in detail. The use of the disconnection circuit 5 is not limited to high sensitivity and low power consumption, but may be implemented by other switching circuits in other embodiments.
In this embodiment, the disconnection circuit 5 is provided with an RC absorption loop, and includes a capacitor C2 and a resistor R2, where the capacitor C2 and the resistor R2 are connected in series and then connected in parallel with the NMOS transistor Q1.
When the power supply is disconnected, the disconnection circuit 5 is switched off, the current loop of the relay coil is quickly disconnected, the current of the coil is further quickly reduced, the counter electromotive force generated by the quick reduction of the current of the coil loop is absorbed by the RC absorption loop, and therefore the effect of quick switching is achieved. Of course, in other embodiments, other sinking circuits such as TVS sinking circuits may be used instead of RC sinking circuits.
The invention also provides a relay which is provided with the relay control circuit.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A relay control circuit, characterized by: control circuit and electric current sampling circuit are put to folk prescription ripples including power conversion module, folk prescription ripples trigger circuit, fortune, power conversion module's output is used for connecing the relay coil, for the relay coil power supply, electric current sampling circuit is used for the electric current size that the relay coil flowed through in the sampling, control circuit's two inputs are put in the fortune respectively to folk prescription ripples trigger circuit's output and electric current sampling circuit's output, control circuit's output power conversion module's feedback foot is put to fortune, control circuit is put and is used for carrying out following operation back output to folk prescription ripples trigger circuit's output signal and electric current sampling circuit's sampling signal:
VOUT＝k1Vs-k2Vin
wherein, VOUTIs the voltage value, V, of the output signal of the operational amplifier control circuitsIs the voltage value, V, of the sampled signal of the current sampling circuitinIs the voltage value, k, of the output signal of the one-way wave trigger circuit1And k2Is a constant.
2. The relay control circuit according to claim 1, wherein: the relay further comprises a disconnection circuit which is arranged in series in the loop of the relay coil and is configured to be turned off when the power supply is disconnected.
3. The relay control circuit of claim 2, wherein: the disconnection circuit is provided with an RC absorption loop.
4. The relay control circuit according to claim 1, wherein: the power supply conversion module is a BUCK circuit composed of a DC-DC power supply chip U1, an energy storage inductor L1 and a freewheeling diode D2, and a feedback pin of the DC-DC power supply chip U1 is connected with the output end of the operational amplifier control circuit.
5. The relay control circuit of claim 4, wherein: the model of the DC-DC power supply chip U1 is TPS 54140.
6. The relay control circuit of claim 1, wherein: the single-wave trigger circuit is composed of a PNP triode Q2.
7. The relay control circuit of claim 6, wherein: the single-wave trigger circuit further comprises a voltage-regulator tube ZD2, an emitter series resistor R7 of the PNP triode Q2 is connected with the input end of a power supply, one path of a base of the PNP triode Q2 is grounded through a resistor R9 and a capacitor C3 which are connected in series, one path of the base of the PNP triode Q2 is connected with the negative end of the voltage-regulator tube ZD2 and an emitter of the PNP triode Q2 through the resistor R10, the positive end of the voltage-regulator tube ZD2 is grounded, a collector series resistor R6 of the PNP triode Q2 is connected with the input end of the operation and discharge control circuit, and the emitter series resistor R5 of the PNP triode Q2 is connected with a collector of the PNP triode Q2.
8. The relay control circuit of claim 1, wherein: the operational amplifier control circuit is composed of an operational amplifier U2.
9. The relay control circuit according to claim 1, wherein: the current sampling circuit comprises a sampling resistor R4, and the sampling resistor R4 is connected in series in a loop of the relay coil.
10. A relay, characterized by: a relay control circuit according to any one of claims 1 to 9 is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010186619.1A CN111403236B (en) | 2020-03-17 | 2020-03-17 | Relay control circuit and relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010186619.1A CN111403236B (en) | 2020-03-17 | 2020-03-17 | Relay control circuit and relay |
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| Publication Number | Publication Date |
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| CN111403236A CN111403236A (en) | 2020-07-10 |
| CN111403236B true CN111403236B (en) | 2022-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010186619.1A Active CN111403236B (en) | 2020-03-17 | 2020-03-17 | Relay control circuit and relay |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2355123Y (en) * | 1997-02-21 | 1999-12-22 | 江世椿 | Fouling-proof energy saving booster for gasoline vehicle |
| CN1747096A (en) * | 2005-08-30 | 2006-03-15 | 陈俊峰 | Impluse modulation circuit of relay |
| CN1815865A (en) * | 2005-01-31 | 2006-08-09 | 台湾类比科技股份有限公司 | DC-toDC. boost converting device and method |
| CN1901343A (en) * | 2006-07-19 | 2007-01-24 | 中国科学院等离子体物理研究所 | Power convertion circuit with protective self locking function |
| CN2929948Y (en) * | 2006-03-06 | 2007-08-01 | 孙迎光 | Contact large gap low power consumption electromagnetic relay |
| CN101533303A (en) * | 2008-03-12 | 2009-09-16 | 鸿富锦精密工业（深圳）有限公司 | Switch power supply circuit with power saving function |
| CN201436608U (en) * | 2009-06-17 | 2010-04-07 | 珠海格力电器股份有限公司 | Controller energy saving device equipped with a relay |
| CN101820187A (en) * | 2010-01-26 | 2010-09-01 | 广州大学 | Solar power residual electric energy collecting circuit |
| CN202979362U (en) * | 2012-07-30 | 2013-06-05 | 泉州市福连天电子科技有限公司 | Taillight detection control circuit |
-
2020
- 2020-03-17 CN CN202010186619.1A patent/CN111403236B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2355123Y (en) * | 1997-02-21 | 1999-12-22 | 江世椿 | Fouling-proof energy saving booster for gasoline vehicle |
| CN1815865A (en) * | 2005-01-31 | 2006-08-09 | 台湾类比科技股份有限公司 | DC-toDC. boost converting device and method |
| CN1747096A (en) * | 2005-08-30 | 2006-03-15 | 陈俊峰 | Impluse modulation circuit of relay |
| CN2929948Y (en) * | 2006-03-06 | 2007-08-01 | 孙迎光 | Contact large gap low power consumption electromagnetic relay |
| CN1901343A (en) * | 2006-07-19 | 2007-01-24 | 中国科学院等离子体物理研究所 | Power convertion circuit with protective self locking function |
| CN101533303A (en) * | 2008-03-12 | 2009-09-16 | 鸿富锦精密工业（深圳）有限公司 | Switch power supply circuit with power saving function |
| CN201436608U (en) * | 2009-06-17 | 2010-04-07 | 珠海格力电器股份有限公司 | Controller energy saving device equipped with a relay |
| CN101820187A (en) * | 2010-01-26 | 2010-09-01 | 广州大学 | Solar power residual electric energy collecting circuit |
| CN202979362U (en) * | 2012-07-30 | 2013-06-05 | 泉州市福连天电子科技有限公司 | Taillight detection control circuit |
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| CN111403236A (en) | 2020-07-10 |
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