CN108735552B - Coil control circuit of contactor - Google Patents
Coil control circuit of contactor Download PDFInfo
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- CN108735552B CN108735552B CN201810938230.0A CN201810938230A CN108735552B CN 108735552 B CN108735552 B CN 108735552B CN 201810938230 A CN201810938230 A CN 201810938230A CN 108735552 B CN108735552 B CN 108735552B
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- 239000003990 capacitor Substances 0.000 claims description 33
- 230000003287 optical effect Effects 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 7
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- 238000010521 absorption reaction Methods 0.000 description 2
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- 238000006842 Henry reaction Methods 0.000 description 1
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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
- H01H47/22—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
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Abstract
The invention provides a coil control circuit of a contactor, which comprises a follow current control circuit and a coil driving circuit, wherein the coil driving circuit comprises a MOS tube T1 and a PWM generator U3 for driving the MOS tube T1, the drain electrode of the MOS tube T1 is connected with a contactor coil, the source electrode of the MOS tube T1 is grounded to control the connection and disconnection between the contactor coil and a contactor power supply, and the follow current control circuit consists of a bidirectional switch device K1, a MOS tube T2 and a follow current tube driving circuit, and a synchronous control signal of the follow current tube driving circuit is provided by the coil driving circuit; in the sucking and holding stage of the contactor, the two-way switch device K1 of the follow current control circuit and the switch state of the MOS tube T1 of the coil driving circuit are in a complementary relationship, namely when the MOS tube T1 is conducted, the two-way switch device K1 is turned off, and at the moment, the coil of the contactor stores energy; when the MOS tube T1 is turned off, the bidirectional switch device K1 is turned on, and a low-impedance follow current path is provided for the contactor coil through the bidirectional switch device K1.
Description
Technical Field
The invention relates to the field of alternating-current contactors, in particular to a coil control circuit of a contactor.
Background
The electromagnetic control system of the traditional contactor consists of a coil and an iron core, the number of turns of the coil is hundreds or even thousands of turns, the contactor coil is actually an inductor with large inductance and internal resistance, and the inductance of the contactor coil is usually in the order of hundreds of millihenries to hundreds of henries, and the internal resistance is tens of ohms to hundreds of ohms. The whole working process of the contactor coil can be divided into three phases: a suction phase, a holding phase and a turn-off phase. During the pull-in phase, the contactor coil passes a larger pull-in current, and the coil generates a larger electromagnetic force to close the contactor contact, and the process is generally within 200 ms. When the contactor contacts are attracted, the attraction stage is entered, the attraction current of the coil is about one tenth of the attraction current in the stage, and the loss of the coil is increased due to the excessive attraction current. The phase in which the contactor contacts are opened is called the off phase, and the current of the coil is consumed to open the contactor contacts. The contactor coil requires a large current when suctioned and requires only a small current when suctioned. Conventional contactors have no other control element and can only be limited in current by the impedance of the coil itself. The impedance of the coil cannot be designed to be too large in order to accommodate the large currents required for pull-in. Therefore, during the holding process of the contactor, the current flowing through the coil is far greater than the current actually needed, and the redundant energy becomes the heat of the coil, so that not only is the energy wasted, but also the reliability of the temperature rise of the coil is reduced. In order to solve the problem of large power consumption of the traditional contactor, a plurality of power saving circuits of the contactor are provided.
The circuit shown in fig. 1 is a common power saving circuit, and the current of the contactor coil 1 can be adjusted by adjusting the duty ratio of the MOS transistor TR 1. The duty ratio of the TR1 is larger in the sucking stage, and the duty ratio of the TR1 is smaller in the sucking stage, so that the contactor coil can realize the sucking of large current and small current, thereby achieving the effect of energy saving. In the circuit, a diode D1 and a MOS tube TR2 provide a follow current loop of a coil, when the MOS tube TR1 is in an off state in a contactor holding stage, the MOS tube TR2 is conducted to provide a follow current loop of a contactor coil inductance, at the moment, the voltage drop of the follow current loop formed by the diode D1 and the MOS tube TR2 is about 0.75V, and the low-impedance follow current loop in the holding stage is beneficial to reducing the loss of the whole circuit. When in the contactor off phase, the current of the coil needs to be consumed rapidly, so that the contactor can be turned off rapidly. In the turn-off stage of the contactor, the MOS tube TR2 is continuously turned off, meanwhile, the MOS tube TR1 is synchronously and continuously turned off, the current of the coil of the contactor is rapidly consumed, and the contactor is rapidly turned off.
Disclosure of Invention
The invention aims to provide a coil control circuit of a contactor, which can enable the contactor to be rapidly turned off and simultaneously enable the loss of the coil of the contactor in a holding stage to be smaller.
In order to achieve the above object, the present invention provides a coil control circuit of a contactor, including a freewheel control circuit and a coil driving circuit, wherein the coil driving circuit includes a MOS transistor T1 and a PWM generator U3 for driving the MOS transistor T1, a drain electrode of the MOS transistor T1 is connected to a contactor coil, a source electrode of the MOS transistor T1 is grounded to control on and off between the contactor coil and a contactor power supply, the freewheel control circuit is composed of a bidirectional switch device K1, a MOS transistor T2 and a freewheel driving circuit, and a synchronization control signal of the freewheel driving circuit is provided by the coil driving circuit; in the sucking and holding stage of the contactor, the two-way switch device K1 of the follow current control circuit and the switch state of the MOS tube T1 of the coil driving circuit are in a complementary relationship, namely when the MOS tube T1 is conducted, the two-way switch device K1 is turned off, and at the moment, the coil of the contactor stores energy; when the MOS tube T1 is turned off, the bidirectional switch device K1 is turned on, and a low-impedance follow current path is provided for the contactor coil through the bidirectional switch device K1; in the turn-off stage of the contactor, the MOS tube T1 and the bidirectional switch device K1 are turned off simultaneously, so that the contactor is turned off rapidly.
Preferably, the follow current control circuit comprises a bidirectional switch device K1, a resistor R1, a capacitor C1, a resistor R3, a MOS tube T2, an AND gate U1 and an NOT gate U2, wherein the bidirectional switch device K1 adopts an optical MOS relay; the coil driving circuit comprises a MOS tube T1, a resistor R2, a capacitor C2 and a PWM generator U3; the connection relation is as follows: two output ends of the bidirectional switch device K1 are respectively led out to serve as output ends of a follow current control circuit and are used for being connected with two ends of a contactor coil; a series network formed by connecting a resistor R1 and a capacitor C1 in series is connected in parallel to two output ends of the bidirectional switch device K1; the input positive end of the bidirectional switch device K1 is connected with the positive electrode of the power supply VCC through a resistor R3, the input negative end of the bidirectional switch device K1 is connected with the drain electrode of the MOS tube T2, and the source electrode of the MOS tube T2 is connected to the power supply ground; the grid electrode of the MOS tube T2 is connected with the output end of the AND gate U1; the two input ends of the AND gate, one is connected with a contactor control signal, the other is connected with the output end of the NOT gate U2, and the input end of the NOT gate U2 is connected with the output end of the PWM generator U3; the input enabling end of the PWM generator U3 is connected with a contactor control signal, the output end of the PWM generator U3 is also connected with one end of a resistor R2, the other end of the resistor R2 is connected with the grid electrode of the MOS tube T1, the source electrode of the MOS tube T1 is connected with the power supply ground, and the two ends of a capacitor C2 are respectively connected with the grid electrode and the source electrode of the MOS tube T1.
Preferably, the follow current control circuit comprises a bidirectional switch device K1, a resistor R1, a capacitor C1, a resistor R3, a MOS tube T2, an AND gate U1 and an NOT gate U2, wherein the bidirectional switch device K1 adopts an electromagnetic relay; the coil driving circuit comprises a MOS tube T1, a resistor R2, a capacitor C2 and a PWM generator U3; the connection relation is as follows: two output ends of the bidirectional switch device K1 are respectively led out to serve as output ends of a follow current control circuit and are used for being connected with two ends of a contactor coil; a series network formed by connecting a resistor R1 and a capacitor C1 in series is connected in parallel to two output ends of the bidirectional switch device K1; the input positive end of the bidirectional switch device K1 is connected with the positive electrode of a power VCC through a resistor R3, the input negative end of the bidirectional switch device K1 is connected with the drain electrode of a MOS tube T2, the source electrode of the MOS tube T2 is connected with the power ground, the grid electrode of the MOS tube T2 is connected with the output end of an AND gate U1, two input ends of the AND gate are connected with a contactor control signal, one input end of the AND gate is connected with the output end of a NOT gate U2, and the input end of the NOT gate U2 is connected with the output end of a PWM generator U3; the input enabling end of the PWM generator U3 is connected with a contactor control signal, the output end of the PWM generator U3 is also connected with one end of a resistor R2, the other end of the resistor R2 is connected with the grid electrode of the MOS tube T1, the source electrode of the MOS tube T1 is connected with the power supply ground, and the two ends of a capacitor C2 are respectively connected with the grid electrode and the source electrode of the MOS tube T1.
The invention also provides a coil control circuit of the contactor, which comprises a follow current control circuit and a coil driving circuit, wherein the coil driving circuit comprises an MOS tube T1 and a PWM generator U3 for driving the MOS tube T1, the drain electrode of the MOS tube T1 is connected with the coil of the contactor, the source electrode of the MOS tube T1 is grounded, and the follow current control circuit comprises a bidirectional switch device K1, a resistor R3 and an MOS tube T2, and the connection relation is as follows: two output ends of the bidirectional switch device K1 are respectively led out to serve as output ends of a follow current control circuit and are used for being connected with two ends of a contactor coil; the input positive end of the bidirectional switch device K1 is connected with the positive electrode of the power supply VCC through a resistor R3, the input negative end of the bidirectional switch device K1 is connected with the drain electrode of the MOS tube T2, and the source electrode of the MOS tube T2 is connected to the power supply ground; the grid electrode of the MOS tube T2 is connected with a connecting tube driving circuit.
Preferably, the freewheel tube driving circuit includes an and gate U1 and an not gate U2, two input ends of the and gate U1, one connected with a contactor control signal, and the other connected with an output end of the not gate U2, the input end of the not gate U2 being connected with an output end of the PWM generator U3; the output end of the AND gate U1 is connected with the grid electrode of the MOS tube T2.
Preferably, the freewheel tube driving circuit includes an and gate U1, an not gate U2, a resistor R2 and a capacitor C2, where two input ends of the and gate U1 are connected to a contactor control signal, one is connected to an output end of the not gate U2, and an input end of the not gate U2 is connected to an output end of the PWM generator U3; the output end of the PWM generator U3 is also connected with one end of a resistor R2, and the other end of the resistor R2 is connected with the grid electrode of the MOS tube T1; the output end of the AND gate U1 is connected with the grid electrode of the MOS tube T2.
Preferably, the bidirectional switch device K1 of the follow current control circuit adopts an optical MOS relay, and two output ends of the optical MOS relay are respectively led out to serve as output ends of the follow current control circuit and are used for being connected with two ends of a contactor coil; the input positive end of the photo-MOS relay is connected with the positive electrode of the power supply VCC through a resistor R3, and the input negative end of the photo-MOS relay is connected with the drain electrode of the MOS tube T2.
Preferably, the bidirectional switch device K1 of the follow current control circuit adopts an electromagnetic relay, and two output ends of the electromagnetic relay are respectively led out to serve as output ends of the follow current control circuit and are used for being connected with two ends of a contactor coil; the input positive end of the electromagnetic relay is connected with the positive electrode of the power supply VCC through a resistor R3, and the input negative end of the electromagnetic relay is connected with the drain electrode of the MOS tube T2.
Preferably, the freewheel control circuit further comprises a resistor R1 and a capacitor C1, and a series network formed by connecting the resistor R1 and the capacitor C1 in series is connected in parallel to two output ends of the bidirectional switch device K1.
The invention adopts a low-impedance bidirectional switch device as a freewheeling loop of a contactor coil to replace the freewheeling loop formed by TR2 and D1 in the prior art scheme shown in the circuit figure 1, the bidirectional switch device can be an optical MOS relay or an electromagnetic relay, the on-resistance of the optical MOS relay and the electromagnetic relay is in the level of tens of milliohms, the on-voltage drop of the bidirectional switch device is about 0.1V, and compared with the freewheeling loop formed by TR2 and D1 of the prior circuit, the freewheeling loop has lower on-resistance, and the energy loss is only 1/7 of the energy loss in the holding stage of the contactor.
Drawings
FIG. 1 is a schematic circuit diagram of a prior art contactor power saving circuit with a quick turn-off function;
fig. 2A is a schematic block diagram of a coil control circuit of a contactor according to a first embodiment of the present invention;
FIG. 2B is a schematic circuit diagram of a coil control circuit of the contactor according to the first embodiment of the invention;
FIG. 3 is a timing diagram of the switch T1, the bi-directional switch K1 and the contactor status signal in the coil control circuit of the contactor according to the first embodiment of the present invention;
FIG. 4 is a timing diagram of control signals of a coil control circuit of the contactor according to the first embodiment of the invention;
fig. 5 is a schematic circuit diagram of a coil control circuit of a contactor according to a second embodiment of the invention.
Detailed Description
The invention provides a coil control circuit of a contactor, which comprises a follow current control circuit FC1, a coil driving circuit FC2 and a contactor coil L, wherein the follow current control circuit FC1 consists of a low-impedance bidirectional switch device and a switch control circuit, as shown in FIG. 2A. The freewheel control circuit FC1 includes a low-impedance bi-directional switching device K1, which may be a photo MOS relay or an electromagnetic relay. The circuit connection relation of the invention is as follows: two output ends (namely switch poles) of the bidirectional switch device K1 are respectively connected with two ends of the contactor coil L, an input positive end of the bidirectional switch device K1 is connected with a positive electrode of a power supply through a resistor, an input negative end of the bidirectional switch device K1 is connected with a switch control circuit, and the bidirectional switch device K1 is connected to the power supply ground through the switch control circuit. The bidirectional switching device and the switching control circuit form a follow current control circuit FC1 of the contactor coil. The freewheel control circuit FC1 receives the contactor control signal Sin and the drive signal of the coil drive circuit FC2 to cooperate with the synchronous operation. In addition, the coil driving circuit FC2 includes at least one switch T1, one end of the contactor coil L is connected to the positive electrode of the contactor power supply, the other end of the contactor coil L is connected to one switching pole of the switch T1, and the other switching pole of the switch T1 is connected to the contactor power supply ground. The coil driving circuit FC2 receives the contactor control signal Sin, and determines whether to output a PWM driving signal according to the polarity of Sin to drive the on and off of the control switch T1, thereby controlling the on and off of the contactor.
Specifically, a coil control circuit of a contactor is suitable for controlling a coil of the contactor, and comprises a follow current control circuit FC1, a coil driving circuit FC2 and a contactor coil L, wherein the follow current control circuit FC1 consists of a low-impedance bidirectional switching device and a switching control circuit. The freewheel control circuit FC1 includes a low-impedance bi-directional switching device K1, which may be a photo MOS relay or an electromagnetic relay. The coil driving circuit FC2 includes at least one switch T1 for controlling energization and de-energization of the contactor coil. When the contactor is in the sucking and holding stage, the switch state of the switch T1 and the switch state of the bidirectional switch device K1 are opposite, namely when the switch T1 is turned on, the bidirectional switch device K1 is turned off, and at the moment, the coil of the contactor stores energy; when the switch T1 is turned off, the bidirectional switching device K1 is turned on, and K1 provides a low-impedance freewheel path for the contactor coil to maintain the coil energy. In the phase of switching off the contactor, the switch T1 and the bidirectional switch device are simultaneously switched off, and the stored energy of the coil of the contactor is rapidly released, so that the purpose of rapidly switching off the contactor is achieved. The switch T1, the bidirectional switch device K1, and the contactor status timing diagram are shown in fig. 3.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
First embodiment
A first embodiment of the coil control circuit of the contactor of the present invention is shown in fig. 2B. The invention provides a coil control circuit of a contactor, which comprises a follow current control circuit FC1, a coil driving circuit FC2 and a contactor coil L, wherein the follow current control circuit FC1 consists of a low-impedance bidirectional switch device K1 and a switch control circuit. The follow current control circuit FC1 comprises a bidirectional switch device K1, a resistor R3, a MOS tube T2 and a follow current tube driving circuit for driving the MOS tube T2, wherein the bidirectional switch device K1 is an optical MOS relay; the resistor R3 is a current limiting resistor and is selected according to the working voltage of the bidirectional switch device K1, and a resistor of 0 ohm can be selected; the freewheel tube driving circuit is composed of an AND gate U1 and an NOT gate U2; the freewheel control circuit FC1 may further include an absorption circuit composed of a resistor R1 and a capacitor C1. In order to offset the delay of the control circuit of the bidirectional switch K1, the flywheel tube driving circuit can also comprise a delay circuit, and the delay circuit is composed of a resistor R2 and a capacitor C2. The coil driving circuit FC2 includes a MOS transistor T1 and a PWM generator U3.
The connection relation of the coil control circuit of the contactor is as follows: two output ends (i.e. switch poles) of the bidirectional switch device K1 are respectively connected with two ends of the contactor coil L, and a series network formed by a resistor R1 and a capacitor C1 is connected in parallel with the two output ends of the bidirectional switch device K1 and also connected in parallel with the two ends of the contactor coil L; the input positive end of the bidirectional switch device K1 is connected with the positive electrode of the power VCC through a resistor R3, the input negative end of the bidirectional switch device K1 is connected with the drain electrode of the MOS tube T2, the source electrode of the MOS tube T2 is connected to the power ground, the grid electrode of the MOS tube T2 is connected with the output end of the AND gate U1, two input ends of the AND gate are connected with the contactor control signal Sin, one input end of the AND gate is connected with the output end of the NOT gate U2, and the input end of the NOT gate U2 is connected to the output end of the PWM generator U3. The output enabling end of the PWM generator U3 is connected with the contactor control signal Sin, the output end of the PWM generator U3 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the grid electrode of the MOS tube T1, one end of the contactor coil L is connected with the contactor power supply VPP, the other end of the contactor coil L is connected with the drain electrode of the MOS tube T1, the source electrode of the MOS tube T1 is connected with the power supply ground, and two ends of the capacitor C2 are respectively connected with the grid electrode and the source electrode of the MOS tube T1.
Fig. 3 shows a timing chart of the contactor control signal Sin, the MOS transistor T1 and the bidirectional switch device K1, and fig. 4 shows a timing chart of the contactor control signal Sin, the output voltage VA of the PWM generator U3 and the output voltage VB of the and gate U1. The control principle of the coil control circuit of the contactor according to the first embodiment of the present invention is described as follows:
1. when the control signal Sin of the contactor is low level, the contactor is in an off state, when the Sin is changed from low level to high level, the PWM generator U3 is enabled to output PWM signals, the first pulse output by the PWM generator U3 is a wide pulse, so that the contactor coil is ensured to flow through a large current, the stable and rapid suction of the contactor is ensured, the narrow pulse is output subsequently, and the contactor coil is maintained in a small current state, so that the energy consumption of the contactor in the holding stage is reduced.
2. When Sin changes from low to high, one input of the and gate U1 is Sin, and the output VB of the and gate U1 follows the other input thereof, i.e., the output of the not gate U2. The input of the not gate U2 is the output VA of the PWM generator U3 (hereinafter referred to as VA), i.e. the output VB of the and gate U1 (hereinafter referred to as VB) is the inverse of the output VA of the PWM generator U3. VA drives the on and off of the MOS tube T1 through the resistor R2 and the capacitor C2, VB drives the MOS tube T2, and the on and off of the switching pole of the bidirectional switching device K1 are controlled. When VA is high level, VB is low level, at the moment, the MOS tube T1 is turned on, the bidirectional switch device K1 is turned off, and the contactor coil L stores energy; when VA is low level, VB is high level, at this time, the MOS transistor T1 is turned off, the bidirectional switching device K1 is turned on, and the contactor coil L freewheels through the bidirectional switching device K1 to maintain the coil energy. The resistor R2 and the capacitor C2 form a delay circuit to offset the delay of the control circuit of the bidirectional switch device K1, so that the actions of the MOS tube T1 and the bidirectional switch device K1 are synchronous.
3. When Sin is changed from high level to low level, one input end of the AND gate U1 is Sin and is low level, the output VB of the AND gate U1 outputs low level no matter what the other input end is, at the moment, the PWM generator U3 is forbidden to output, the VA outputs low level, at the moment, the MOS tube T1 is turned off, meanwhile, the bidirectional switch device K1 is turned off, the energy of the contactor coil L is released rapidly, and the contactor is turned off rapidly. The absorption circuit composed of the resistor R1 and the capacitor C1 can prevent the two ends of the bidirectional switch device K1 and the MOS tube T1 from being damaged due to the excessively high voltage.
4. Fig. 4 is a timing chart of control signals such as Sin, VA, VB.
Second embodiment
A second embodiment of the coil control circuit of the contactor of the present invention is shown in fig. 5. The invention provides a coil control circuit of a contactor, which comprises a follow current control circuit FC1, a coil driving circuit FC2 and a contactor coil L, wherein the follow current control circuit FC1 consists of a low-impedance bidirectional switch device K1 and a switch control circuit, as shown in FIG. 5. The follow current control circuit FC1 comprises a bidirectional switch device K1, a resistor R1, a capacitor C1, a resistor R3, a MOS tube T2, an AND gate U1 and an NOT gate U2, wherein the bidirectional switch device K1 is an electromagnetic relay. The coil driving circuit FC2 comprises a MOS tube T1, a resistor R2, a capacitor C2 and a PWM generator U3.
The connection relation is as follows: two output ends of the bidirectional switch device K1 are respectively connected with two ends of the contactor coil L, and a series network formed by a resistor R1 and a capacitor C1 is connected in parallel with the two output ends of the bidirectional switch device K1 and is also connected in parallel with two ends of the contactor coil L; the input positive end of the bidirectional switch device K1 is connected with the positive electrode of the power VCC through a resistor R3, the input negative end of the bidirectional switch device K1 is connected with the drain electrode of the MOS tube T2, the source electrode of the MOS tube T2 is connected to the power ground, the grid electrode of the MOS tube T2 is connected with the output end of the AND gate U1, two input ends of the AND gate are connected with the contactor control signal Sin, one input end of the AND gate is connected with the output end of the NOT gate U2, and the input end of the NOT gate U2 is connected to the output end of the PWM generator U3. The input enabling end of the PWM generator U3 is connected with the contactor control signal Sin, the output end of the PWM generator U3 is also connected with one end of a resistor R2, and the other end of the resistor R2 is connected with the grid electrode of the MOS tube T1; one end of the contactor coil L is connected with a contactor power supply VPP, the other end of the contactor coil L is connected with the drain electrode of the MOS tube T1, the source electrode of the MOS tube T1 is connected with the power supply ground, and two ends of the capacitor C2 are respectively connected with the grid electrode and the source electrode of the MOS tube T1.
The control method of the coil control circuit of the contactor of the second embodiment of the present invention is the same as that of the first embodiment.
The coil control circuit of the contactor adopts a low-impedance bidirectional switch device as a freewheeling circuit of the contactor coil to replace the freewheeling circuit formed by the MOS tube TR2 and the diode D1 in the prior circuit shown in figure 1, the bidirectional switch device can be an optical MOS relay or an electromagnetic relay, the on-resistance of the optical MOS relay and the electromagnetic relay is in the level of tens of milliohms, and compared with the on-voltage drop of about 0.75V of the freewheeling circuit formed by the MOS tube TR2 and the diode D1 of the prior circuit, the scheme of the invention can further reduce the on-resistance, and the energy loss is only 1/7 of the energy loss in the holding stage of the contactor.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the invention, and the scope of the invention should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (9)
1. The utility model provides a coil control circuit of contactor, includes freewheel control circuit and coil drive circuit, and coil drive circuit includes MOS pipe T1 and drive MOS pipe T1's PWM generator U3, and MOS pipe T1's drain electrode is connected with the contactor coil, and MOS pipe T1's source electrode ground connection, its characterized in that:
the follow current control circuit consists of a bidirectional switch device K1, an MOS tube T2 and a follow current tube driving circuit, and synchronous control signals of the follow current tube driving circuit are provided by a coil driving circuit;
in the sucking and holding stage of the contactor, the two-way switch device K1 of the follow current control circuit and the switch state of the MOS tube T1 of the coil driving circuit are in a complementary relationship, namely when the MOS tube T1 is conducted, the two-way switch device K1 is turned off, and at the moment, the coil of the contactor stores energy; when the MOS tube T1 is turned off, the bidirectional switch device K1 is turned on, and a low-impedance follow current path is provided for the contactor coil through the bidirectional switch device K1;
in the turn-off stage of the contactor, the MOS tube T1 and the bidirectional switch device K1 are turned off simultaneously, so that the contactor is turned off rapidly.
2. The coil control circuit of a contactor according to claim 1, wherein: the follow current control circuit comprises a bidirectional switch device K1, a resistor R1, a capacitor C1, a resistor R3, a MOS tube T2, an AND gate U1 and an NOT gate U2, wherein the bidirectional switch device K1 adopts an optical MOS relay; the coil driving circuit comprises a MOS tube T1, a resistor R2, a capacitor C2 and a PWM generator U3;
the connection relation is as follows: two output ends of the bidirectional switch device K1 are respectively led out to serve as output ends of a follow current control circuit and are used for being connected with two ends of a contactor coil; a series network formed by connecting a resistor R1 and a capacitor C1 in series is connected in parallel to two output ends of the bidirectional switch device K1; the input positive end of the bidirectional switch device K1 is connected with the positive electrode of the power supply VCC through a resistor R3, the input negative end of the bidirectional switch device K1 is connected with the drain electrode of the MOS tube T2, and the source electrode of the MOS tube T2 is connected to the power supply ground; the grid electrode of the MOS tube T2 is connected with the output end of the AND gate U1; the two input ends of the AND gate, one is connected with a contactor control signal, the other is connected with the output end of the NOT gate U2, and the input end of the NOT gate U2 is connected with the output end of the PWM generator U3; the input enabling end of the PWM generator U3 is connected with a contactor control signal, the output end of the PWM generator U3 is also connected with one end of a resistor R2, the other end of the resistor R2 is connected with the grid electrode of the MOS tube T1, the source electrode of the MOS tube T1 is connected with the power supply ground, and the two ends of a capacitor C2 are respectively connected with the grid electrode and the source electrode of the MOS tube T1.
3. The coil control circuit of a contactor according to claim 1, wherein: the follow current control circuit comprises a bidirectional switch device K1, a resistor R1, a capacitor C1, a resistor R3, a MOS tube T2, an AND gate U1 and an NOT gate U2, wherein the bidirectional switch device K1 adopts an electromagnetic relay; the coil driving circuit comprises a MOS tube T1, a resistor R2, a capacitor C2 and a PWM generator U3;
the connection relation is as follows: two output ends of the bidirectional switch device K1 are respectively led out to serve as output ends of a follow current control circuit and are used for being connected with two ends of a contactor coil; a series network formed by connecting a resistor R1 and a capacitor C1 in series is connected in parallel to two output ends of the bidirectional switch device K1; the input positive end of the bidirectional switch device K1 is connected with the positive electrode of a power VCC through a resistor R3, the input negative end of the bidirectional switch device K1 is connected with the drain electrode of a MOS tube T2, the source electrode of the MOS tube T2 is connected with the power ground, the grid electrode of the MOS tube T2 is connected with the output end of an AND gate U1, two input ends of the AND gate are connected with a contactor control signal, one input end of the AND gate is connected with the output end of a NOT gate U2, and the input end of the NOT gate U2 is connected with the output end of a PWM generator U3; the input enabling end of the PWM generator U3 is connected with a contactor control signal, the output end of the PWM generator U3 is also connected with one end of a resistor R2, the other end of the resistor R2 is connected with the grid electrode of the MOS tube T1, the source electrode of the MOS tube T1 is connected with the power supply ground, and the two ends of a capacitor C2 are respectively connected with the grid electrode and the source electrode of the MOS tube T1.
4. The utility model provides a coil control circuit of contactor, includes freewheel control circuit and coil drive circuit, including MOS pipe T1 and drive MOS pipe T1's PWM generator U3, MOS pipe T1's drain electrode is connected with the contactor coil, MOS pipe T1's source electrode ground connection, its characterized in that:
the follow current control circuit comprises a bidirectional switch device K1, a resistor R3 and a MOS tube T2, and the connection relation is as follows: two output ends of the bidirectional switch device K1 are respectively led out to serve as output ends of a follow current control circuit and are used for being connected with two ends of a contactor coil; the input positive end of the bidirectional switch device K1 is connected with the positive electrode of the power supply VCC through a resistor R3, the input negative end of the bidirectional switch device K1 is connected with the drain electrode of the MOS tube T2, and the source electrode of the MOS tube T2 is connected to the power supply ground; the MOS transistor T2 is driven by a freewheel driving circuit.
5. The coil control circuit of the contactor according to claim 4, wherein: the freewheel tube driving circuit comprises an AND gate U1 and a NOT gate U2, wherein two input ends of the AND gate U1 are connected with a contactor control signal, one input end of the NOT gate U2 is connected with the output end of the NOT gate U2, and the input end of the NOT gate U2 is connected with the output end of the PWM generator U3; the output end of the AND gate U1 is connected with the grid electrode of the MOS tube T2.
6. The coil control circuit of the contactor according to claim 4, wherein: the freewheel tube driving circuit comprises an AND gate U1, a NOT gate U2, a resistor R2 and a capacitor C2, wherein two input ends of the AND gate U1 are connected with a contactor control signal, one input end of the AND gate U2 is connected with an output end of the NOT gate U2, and an input end of the NOT gate U2 is connected with an output end of the PWM generator U3; the output end of the PWM generator U3 is also connected with one end of a resistor R2, and the other end of the resistor R2 is connected with the grid electrode of the MOS tube T1; the output end of the AND gate U1 is connected with the grid electrode of the MOS tube T2.
7. The coil control circuit of the contactor according to claim 4, wherein: the bidirectional switch device K1 of the follow current control circuit adopts an optical MOS relay, and two output ends of the optical MOS relay are respectively led out to serve as output ends of the follow current control circuit and are used for being connected with two ends of a contactor coil; the input positive end of the photo-MOS relay is connected with the positive electrode of the power supply VCC through a resistor R3, and the input negative end of the photo-MOS relay is connected with the drain electrode of the MOS tube T2.
8. The coil control circuit of the contactor according to claim 4, wherein: the bidirectional switch device K1 of the follow current control circuit adopts an electromagnetic relay, and two output ends of the electromagnetic relay are respectively led out to serve as output ends of the follow current control circuit and are used for being connected with two ends of a contactor coil; the input positive end of the electromagnetic relay is connected with the positive electrode of the power supply VCC through a resistor R3, and the input negative end of the electromagnetic relay is connected with the drain electrode of the MOS tube T2.
9. The coil control circuit of a contactor according to any one of claims 4 to 8, wherein: the follow current control circuit further comprises a resistor R1 and a capacitor C1, wherein a series network formed by connecting the resistor R1 and the capacitor C1 in series is connected to two output ends of the bidirectional switch device K1 in parallel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810938230.0A CN108735552B (en) | 2018-08-17 | 2018-08-17 | Coil control circuit of contactor |
| PCT/CN2019/084983 WO2020034665A1 (en) | 2018-08-17 | 2019-04-29 | Coil control circuit of contactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810938230.0A CN108735552B (en) | 2018-08-17 | 2018-08-17 | Coil control circuit of contactor |
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| CN108735552A CN108735552A (en) | 2018-11-02 |
| CN108735552B true CN108735552B (en) | 2024-01-16 |
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| CN201810938230.0A Active CN108735552B (en) | 2018-08-17 | 2018-08-17 | Coil control circuit of contactor |
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| CN108735552B (en) * | 2018-08-17 | 2024-01-16 | 广州金升阳科技有限公司 | Coil control circuit of contactor |
| CN112563074A (en) * | 2019-09-26 | 2021-03-26 | 嘉润电气科技有限公司 | Control method of power-saving and quick-release control circuit of contactor |
| CN113012983B (en) * | 2019-12-20 | 2022-06-03 | 施耐德电气工业公司 | Control device and method for contactor |
| WO2021151282A1 (en) * | 2020-01-31 | 2021-08-05 | 郭桥石 | Energy-saving circuit and starting apparatus |
| CN112087136B (en) * | 2020-08-05 | 2024-07-19 | 广州金升阳科技有限公司 | Shut-down control circuit and control method thereof |
| CN112187228A (en) * | 2020-09-30 | 2021-01-05 | 贵州天义电器有限责任公司 | Constant-current pulse width modulation circuit for contactor coil |
| CN112737432B (en) * | 2020-12-24 | 2022-04-12 | 安荣信科技(北京)有限公司 | Bidirectional follow current circuit of direct current motor |
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Also Published As
| Publication number | Publication date |
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| WO2020034665A1 (en) | 2020-02-20 |
| CN108735552A (en) | 2018-11-02 |
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