CN107863276B - Self-protection direct current contactor drive circuit - Google Patents
Self-protection direct current contactor drive circuit Download PDFInfo
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- CN107863276B CN107863276B CN201711286209.9A CN201711286209A CN107863276B CN 107863276 B CN107863276 B CN 107863276B CN 201711286209 A CN201711286209 A CN 201711286209A CN 107863276 B CN107863276 B CN 107863276B
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- resistor
- direct current
- current contactor
- magnetic bead
- contactor
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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
- H01H47/002—Monitoring or fail-safe circuits
-
- 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
Abstract
The invention discloses a self-protection direct current contactor driving circuit which comprises an isolation optocoupler, a bidirectional thyristor, a voltage regulator tube, a MOSFET tube, an anti-reverse diode, a fly-wheel diode, a filter circuit, a first resistor, a first divider resistor, a second divider resistor and a driving resistor, wherein the isolation optocoupler is connected with the positive electrode of a power supply through an isolation fifth resistor, and the isolation optocoupler is connected with one end of the second divider resistor, one end of the bidirectional thyristor and one end of the driving resistor through the first divider resistor. The invention has the beneficial effects that: the invention realizes the rapid and reliable work of the high-power direct current contactor, has the automatic protection function, realizes the reliable work of the direct current contactor, ensures the stable and reliable work of the direct current contactor, avoids the damage of the energy of the contactor, prolongs the service life and the service efficiency of the direct current contactor, realizes the safety for a long time, and improves the control performance and the use safety performance of the whole direct current contactor.
Description
Technical Field
The invention relates to the technical field of contactor driving, in particular to a self-protection direct current contactor driving circuit.
Background
The high-power direct current contactor has the advantages of good reliability, closed structure, stable coil direct current power supply and shock resistance, and is widely used in automobiles, industrial control, particularly urban rail transit and railway locomotives. For the control of the high-power direct-current contactor, an intermediate relay with a control signal added with small voltage and small current is generally adopted for controlling, and then a normally open and normally closed contact of the intermediate relay is used for controlling the turn-on and turn-off of a coil of the high-power direct-current contactor.
Fig. 1 as follows is a general method for controlling a high-power dc contactor at present, and the working principle is as follows: the control signal drives the triode Q1 to be conducted, the coil of the intermediate relay KM1 is electrified, the normally open contact is closed, the coil of the high-power direct-current contactor is electrified, the high-power direct-current contactor KM2 starts to work, the main contact of the high-power direct-current contactor acts, and therefore the equipment connected with the high-power direct-current contactor starts to work. The circuit controls the intermediate relay by switching on and off of the triode so as to control the high-power direct current contactor. When the circuit is used for controlling a plurality of high-power direct current contactors, a plurality of intermediate relays are needed, and the high-power direct current contactor circuit can realize the functions thereof, but has the following problems: (1) the intermediate relay coil is thin, so that disconnection is easy to occur, contact of contacts is poor, and override tripping can be caused; (2) when the working time is too long, the coil can generate heat, so that the coil can be burnt out, and the contact can move disorderly; (3) the proper type of the intermediate relay needs to be selected, and the relay needs to be managed and maintained in the later period, which are troublesome; (4) the wiring is more and complicated, and the later inspection and maintenance are extremely inconvenient; (5) the cost is greatly improved, and the cost performance is not high; (6) such a drive circuit has no protection power and is prone to malfunction.
Therefore, it is necessary to provide a self-protection dc contactor driving circuit for the above problems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a self-protection direct current contactor driving circuit.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a self-protection direct current contactor driving circuit comprises an isolation optocoupler, a bidirectional thyristor, a voltage regulator tube, a MOSFET tube, an anti-reverse diode, a fly-wheel diode, a filter circuit, a first resistor, a first divider resistor, a second divider resistor and a driving resistor, wherein a first end pin of the isolation optocoupler is connected with a positive electrode of a power supply through a fifth resistor, a fourth end pin of the isolation optocoupler is connected with one end of the second divider resistor, one end of the bidirectional thyristor and one end of the driving resistor through the first divider resistor, the other end of the driving resistor is respectively connected with one end of the voltage regulator tube and a grid electrode of the MOSFET tube, and a source electrode of the MOSFET tube is respectively connected with the filter circuit and the fly-wheel diode through the anti-reverse diode; the drain electrode of the MOSFET is respectively connected with the other end of the voltage stabilizing tube and the other end of the bidirectional thyristor; the other end of the bidirectional thyristor is also respectively connected with the other end of the second voltage-dividing resistor and the positive end of the direct-current contactor through the first resistor; the filter circuit comprises a first magnetic bead, a second magnetic bead and a first capacitor; one end of the first magnetic bead is connected with an anti-reverse diode, and the other end of the first magnetic bead is grounded and connected with one end of the second magnetic bead through a first capacitor; the other end of the second magnetic bead is connected with a coil of the direct current contactor, and the other end of the coil of the direct current contactor is connected with a negative electrode of a power supply and controls the on-off of the main contact; and a second terminal pin of the isolation optocoupler receives a control signal, and a third terminal pin of the isolation optocoupler is connected with a negative terminal of the direct current contactor.
The invention has the beneficial effects that: the invention applies power electronic technology and automation technology to realize the rapid and reliable work of the high-power direct current contactor, has an automatic protection function, realizes the reliable work of the direct current contactor, has a circuit function, ensures the stable and reliable work of the direct current contactor, has the automatic rapid protection function during overcurrent, avoids the damage of the energy of the contactor, prolongs the service life and the service efficiency of the direct current contactor, realizes safety for a long time, and improves the control performance and the use safety performance of the whole direct current contactor.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a prior art high power DC contactor control circuit diagram;
fig. 2 is a circuit diagram of the contactor driving circuit of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 2, a self-protection dc contactor driving circuit includes an isolation optocoupler, a bidirectional thyristor, a voltage regulator tube, a MOSFET tube, an anti-reverse diode, a freewheeling diode, a filter circuit, a first resistor, a first divider resistor, a second divider resistor, and a driving resistor, where a first terminal of the isolation optocoupler is connected to a positive electrode of a power supply through a fifth resistor, a fourth terminal of the isolation optocoupler is connected to one end of the second divider resistor, one end of the bidirectional thyristor, and one end of the driving resistor through the first divider resistor, the other end of the driving resistor is connected to one end of the voltage regulator tube and a gate of the MOSFET tube, and a source of the MOSFET tube is connected to the filter circuit and the freewheeling diode through the anti-reverse diode; the drain electrode of the MOSFET is respectively connected with the other end of the voltage stabilizing tube and the other end of the bidirectional thyristor; the other end of the bidirectional thyristor is also respectively connected with the other end of the second voltage-dividing resistor and the positive end of the direct-current contactor through the first resistor; the filter circuit comprises a first magnetic bead, a second magnetic bead and a first capacitor; one end of the first magnetic bead is connected with an anti-reverse diode, and the other end of the first magnetic bead is grounded and connected with one end of the second magnetic bead through a first capacitor; the other end of the second magnetic bead is connected with a coil of the direct current contactor, and the other end of the coil of the direct current contactor is connected with a negative electrode of a power supply and controls the on-off of the main contact; and a second terminal pin of the isolation optocoupler receives a control signal, and a third terminal pin of the isolation optocoupler is connected with a negative terminal of the direct current contactor.
Further, the drain of the MOSFET tube T2 is connected to the other end of the regulator tube WD1 and the other end of the triac T1, respectively, and the other end of the triac T1 is further connected to the other end of the second voltage-dividing resistor R3 and to the positive terminal DC + of the DC contactor through the first resistor R1, respectively.
The filter circuit comprises a first magnetic bead FB1, a second magnetic bead FB2 and a first capacitor C1, wherein one end of the first magnetic bead FB1 is connected with an anti-reverse connection diode D1, the other end of the first magnetic bead FB1 is grounded and connected with one end of the second magnetic bead FB2 through a first capacitor C1, the other end of the second magnetic bead FB2 is connected with a coil KM1 of a direct current contactor, and the other end of the coil KM1 of the direct current contactor is connected with a negative electrode end DC-of the direct current contactor, so that the connection and disconnection of a main contact are controlled.
The invention applies power electronic technology and automation technology to realize the rapid and reliable work of the high-power direct current contactor, has an automatic protection function, realizes the reliable work of the direct current contactor, has a circuit function, ensures the stable and reliable work of the direct current contactor, has the automatic rapid protection function during overcurrent, avoids the damage of the energy of the contactor, prolongs the service life and the service efficiency of the direct current contactor, realizes safety for a long time, and improves the control performance and the use safety performance of the whole direct current contactor.
The invention has the most obvious characteristics that the design is carried out by utilizing the high-speed switching characteristics of the power MOSFET T2 and the bidirectional thyristor T1, and the invention has the advantages of high driving speed, self-protection function and the like.
The working principle is as follows:
as shown in fig. 2, the invention can realize reliable and stable driving and self-protection of the high-power direct current contactor; the primary side pin of the isolation optocoupler TPL1 is connected with a control signal to control the attraction and the disconnection of the direct current contactor, the secondary side pin is respectively connected with a coil driving direct current voltage of the direct current contactor, one pin is connected with the negative of the direct current voltage, and the other pin is connected with the positive of the direct current voltage through a current limiting resistor R2 and a current limiting resistor R3 and respectively connected to a bidirectional thyristor and a MOSFET tube T2; when a main contact of the high-power direct-current contactor is to be closed to work, a control signal drives an optocoupler TPL1 to be conducted and drives a MOSFET tube T2 to be conducted, the direct-current contactor is supplied to a coil of the direct-current contactor through T2, the coil of the direct-current contactor is electrified, the main contact is closed, and the contactor starts to work, so that the operation of equipment is controlled; on the contrary, the control signal drives the optocoupler TPL1 to be disconnected, drives the MOSFET tube T2 to be disconnected, and disconnects the coil of the direct current contactor and the main contact;
the model of a driving optocoupler TPL1 in the circuit is selected according to the speed required to be switched on and the power supply of a direct current contactor, the current limiting and voltage dividing resistors R2 and R3 are connected with the driving resistor R4 of the MOS transistor T2 through the output of the voltage dividing resistor R2 when the optocoupler is switched on, and the resistance values of the resistors R2, R3 and R4 are determined according to the value (DC +, DC-) of direct current voltage and the selected MOS transistor T2. The T2 in the circuit of fig. 2 is selected as a low-pass power MOSFET transistor, with the T2 device turned off when its gate G pin is high and turned on when its gate G pin is low. In fig. 2, the voltage regulator WD1 can stabilize the voltage of the gate G pin of T2 at about 10V when the MOS transistor T2 of the circuit is turned on, thereby ensuring stable and reliable on-state operation of the power MOSFET T2.
In the circuit, R1 is a milliohm resistor, the value of which is selected according to the current to be protected of the direct current contactor, and is connected with the gate pole and the other pole of the bidirectional thyristor T1 to play the role of overcurrent protection, when overcurrent occurs, the voltage on the R1 resistor rises and is connected to the gate pole of the bidirectional thyristor T1 to turn on the bidirectional thyristor T1, the positive power supply of the direct current voltage is added to the gate pole G of the MOSFET T2 through the bidirectional thyristor to pull the pin of the gate pole G to high voltage to rapidly turn off the MOSFET T2, so that the direct current contactor is powered off and stops working to play the role of overcurrent protection.
D2 in fig. 2 is a freewheeling fast recovery diode, and when the dc contactor is turned off, the energy in the coil is released to avoid burning the coil, so as to protect the coil, D1 is an anti-reverse diode to prevent the power supply from being reversed, so as to protect the driving circuit, and FB1 and FB2 are magnetic beads to filter the high-frequency component in the circuit, thereby improving the anti-interference capability of the circuit.
The circuit of the invention has the advantages that: (1) micro output power devices such as a micro processing chip with low power, an optical coupler and a power MOSFET with sensitive switching characteristics are used for directly driving the contactor; (2) the control is simpler and more convenient, the wiring is simple, and the operation is convenient (a plurality of circuits can be controlled by using a chip and corresponding keys, and a plurality of intermediate relays are not needed any more). Therefore, the working efficiency is improved, the cost performance is high, and the device is very convenient and practical.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (1)
1. A self-protection direct current contactor drive circuit is characterized in that: the power supply comprises an isolation optocoupler, a bidirectional thyristor, a voltage-regulator tube, a MOSFET tube, an anti-reverse diode, a fly-wheel diode, a filter circuit, a first resistor, a first divider resistor, a second divider resistor and a driving resistor, wherein a first terminal pin of the isolation optocoupler is connected with the positive electrode of a power supply through a fifth resistor, a fourth terminal pin of the isolation optocoupler is connected with one end of the second divider resistor, one end of the bidirectional thyristor and one end of the driving resistor through the first divider resistor, the other end of the driving resistor is respectively connected with one end of the voltage-regulator tube and the grid electrode of the MOSFET tube, and a source electrode of the MOSFET tube is respectively connected with the filter circuit and the fly-wheel diode through the anti; the drain electrode of the MOSFET is respectively connected with the other end of the voltage stabilizing tube and the other end of the bidirectional thyristor; the other end of the bidirectional thyristor is also respectively connected with the other end of the second voltage-dividing resistor and the positive end of the direct-current contactor through the first resistor; the filter circuit comprises a first magnetic bead, a second magnetic bead and a first capacitor; one end of the first magnetic bead is connected with an anti-reverse diode, and the other end of the first magnetic bead is grounded and connected with one end of the second magnetic bead through a first capacitor; the other end of the second magnetic bead is connected with a coil of the direct current contactor, and the other end of the coil of the direct current contactor is connected with a negative electrode of a power supply and controls the on-off of the main contact; and a second terminal pin of the isolation optocoupler receives a control signal, and a third terminal pin of the isolation optocoupler is connected with a negative terminal of the direct current contactor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711286209.9A CN107863276B (en) | 2017-12-07 | 2017-12-07 | Self-protection direct current contactor drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711286209.9A CN107863276B (en) | 2017-12-07 | 2017-12-07 | Self-protection direct current contactor drive circuit |
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| CN107863276A CN107863276A (en) | 2018-03-30 |
| CN107863276B true CN107863276B (en) | 2021-04-02 |
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| CN201711286209.9A Active CN107863276B (en) | 2017-12-07 | 2017-12-07 | Self-protection direct current contactor drive circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110660613B (en) * | 2018-06-28 | 2021-11-12 | 深圳光峰科技股份有限公司 | Power supply line control module |
| CN110545097B (en) * | 2019-07-24 | 2023-06-16 | 上海空间电源研究所 | Contactless switch circuit controlled by low-voltage pulse trigger |
| CN110867343B (en) * | 2019-11-20 | 2021-10-22 | 广州金升阳科技有限公司 | Contactor coil isolation control circuit and isolation control method thereof |
| CN113506706B (en) * | 2021-06-28 | 2024-03-19 | 江苏纳通能源技术有限公司 | Contactor driving circuit with high reliability and working method |
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| CN205510490U (en) * | 2016-04-19 | 2016-08-24 | 皖西学院 | LED intelligence constant voltage drive controller |
| CN206379876U (en) * | 2017-01-05 | 2017-08-04 | 科蒂斯技术（苏州）有限公司 | The short-circuit protection circuit that a kind of use P MOS are exported as high-side driver |
| CN209169052U (en) * | 2017-12-07 | 2019-07-26 | 华北科技学院 | A kind of self-shield D.C. contactor driving circuit |
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2017
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Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87204653U (en) * | 1987-09-28 | 1988-07-13 | 蒋祁生 | Multi-function and automatic control protection device for electrical equipments |
| WO1990010967A1 (en) * | 1989-03-06 | 1990-09-20 | Inresco, Inc. | Solid state circuit protector |
| CN102025122A (en) * | 2009-09-18 | 2011-04-20 | 鸿富锦精密工业（深圳）有限公司 | Protective circuit |
| CN202332733U (en) * | 2011-11-10 | 2012-07-11 | 湖南南车时代电动汽车股份有限公司 | Switching value isolation circuit for relay |
| CN203118870U (en) * | 2013-03-28 | 2013-08-07 | 嘉兴市英力电子科技有限公司 | Improved relay control circuit |
| CN103594289A (en) * | 2013-11-04 | 2014-02-19 | 安徽省烟草公司池州市公司 | Drive circuit of relay |
| CN205510490U (en) * | 2016-04-19 | 2016-08-24 | 皖西学院 | LED intelligence constant voltage drive controller |
| CN105703584A (en) * | 2016-04-26 | 2016-06-22 | 威海顺意电机股份有限公司 | Asynchronous motor with built-in electromagnetic clutch device |
| CN206379876U (en) * | 2017-01-05 | 2017-08-04 | 科蒂斯技术（苏州）有限公司 | The short-circuit protection circuit that a kind of use P MOS are exported as high-side driver |
| CN209169052U (en) * | 2017-12-07 | 2019-07-26 | 华北科技学院 | A kind of self-shield D.C. contactor driving circuit |
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| CN107863276A (en) | 2018-03-30 |
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