CN217135154U - Contactor direct current start control circuit based on electric capacity - Google Patents
Contactor direct current start control circuit based on electric capacity Download PDFInfo
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- CN217135154U CN217135154U CN202220872913.2U CN202220872913U CN217135154U CN 217135154 U CN217135154 U CN 217135154U CN 202220872913 U CN202220872913 U CN 202220872913U CN 217135154 U CN217135154 U CN 217135154U
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Abstract
The utility model discloses a contactor direct current start control circuit based on electric capacity belongs to contactor direct current start control technical field, include: a rectification circuit ZM1 for rectifying the AC voltage into DC high voltage, a stabilized voltage power supply A1 connected with the rectification circuit ZM1 for supplying power, a voltage stabilizing diode D1 connected with the stabilized voltage power supply A1, a control circuit A2 connected with the voltage stabilizing diode D1 for sending on or off instructions, a pull-in execution switch element connected with the control circuit A2 for supplying current to a contactor coil, a starting capacitor C2 connected with the pull-in execution switch element, and a resistor R2 connected with the starting capacitor C2 in parallel; the capacitor-based contactor direct-current starting control circuit ensures that the starting circuit is turned off in a low-current state, and the damage caused by arc discharge of a contact of a breaking switch due to reverse high voltage generated when high voltage and large current are broken is eliminated.
Description
Technical Field
The utility model belongs to the technical field of contactor direct current start control, concretely relates to contactor direct current start control circuit based on electric capacity.
Background
The contactor is applied to electric power, power distribution and power utilization occasions, and a magnetic field is generated by current flowing through a coil in industrial electricity to close a contact so as to control a loaded electric appliance;
in electrical engineering, a contactor is a device which can quickly cut off an alternating current and direct current main loop and can frequently switch on and off a large current control circuit, so the contactor is frequently applied to a motor as a control object, and can also be used for controlling electric loads such as factory equipment, an electric heater, a working machine, various electric power units and the like, and the contactor not only can switch on and off the circuit, but also has a low-voltage release protection function; the contactor has large control capacity, is suitable for frequent operation and remote control, and is one of important elements in an automatic control system;
in industrial electrical, the types of contactors are various, the working current is different from 5A to 1000A, the contactors are quite widely used, in the using process, the voltage at two ends of a coil of an alternating current contactor is from large to small, the current is from high to low, and the existing circuit cannot ensure that a starting circuit is turned off in a low-current state due to the fact that the current of the starting circuit is from large to small, so that arc discharge damage of a contact of a breaking switch is caused by reverse high voltage generated when high voltage and large current are broken, and therefore a capacitor-based contactor direct current starting control circuit needs to be developed to solve the existing problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a contactor direct current start control circuit based on electric capacity to solve because of high voltage, heavy current produced reverse high pressure arouse that disconnected switch contact draws the problem of arc when dividing absolutely.
In order to achieve the above object, the utility model provides a following technical scheme: a capacitor-based contactor dc start control circuit, comprising:
the device comprises a rectifying circuit ZM1 for rectifying alternating-current voltage into direct-current high voltage, a stabilized voltage power supply A1 connected with the rectifying circuit ZM1 and used for supplying power, a voltage stabilizing diode D1 connected with the stabilized voltage power supply A1, a control circuit A2 connected with the voltage stabilizing diode D1 and used for sending a switch-on or switch-off command, a pull-in execution switching element connected with the control circuit A2 and used for supplying current to a contactor coil, a starting capacitor C2 connected with the pull-in execution switching element and a resistor R2 connected with the starting capacitor C2 in parallel.
Preferably, the pull-in execution switch element is a relay JK, and the relay JK is connected with the starting capacitor C2.
Preferably, the pull-in execution switch element is a transistor T1, and the transistor T1 is connected to the starting capacitor C2.
Preferably, the pull-in execution switch element is a MOS transistor T2, and the MOS transistor T2 is connected to the starting capacitor C2.
Preferably, the output end of the rectifier circuit ZM1 is connected to a capacitor C1, and one end of the capacitor C1 is further connected to a regulated power supply a 1.
Preferably, the output end of the regulated power supply a1 is connected to one end of a zener diode D1, the other end of the zener diode D1 is connected to one end of a resistor R1, and the other end of the resistor R1 is connected to a regulated power supply a1 and a capacitor C1.
Preferably, the control circuit a2 is connected to the negative terminal of zener diode D1 and issues on and off commands when the regulated power supply a1 rises to meet the operating voltage condition of the rear pole circuit.
Preferably, the control circuit a2 is connected to a pull-in execution switch element, and the pull-in execution switch element executes the command of the control circuit a2 to complete the on and off of the starting circuit.
The utility model discloses a technological effect and advantage: the capacitor-based direct-current starting control circuit of the contactor uses a circuit for providing pull-in voltage for the alternating-current contactor in a capacitor and resistor parallel connection mode, the capacitor capacity is selected according to the specification and size of the alternating-current contactor, in the pull-in process of the alternating-current contactor, the characteristic that the current of a starting capacitor can suddenly change instantly is utilized, the alternating-current contactor obtains strong current meeting the pull-in requirement, the voltage at two ends of the starting capacitor is increased along with the increase of the movable charging time of the starting capacitor, the voltage at two ends of a coil of the alternating-current contactor is changed from large to small, and the current is changed from high to low.
Drawings
Fig. 1 is a circuit diagram of embodiment 1 of the present invention;
fig. 2 is a circuit diagram of embodiment 2 of the present invention;
fig. 3 is a circuit diagram of embodiment 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Examples 1,
The utility model provides a contactor direct current start control circuit based on electric capacity as shown in figure 1, include: a rectifier circuit ZM1 for converting the rectified ac voltage to a high dc voltage; the output end of the rectifying circuit ZM1 is connected with a capacitor C1, and one end of the capacitor C1 is also connected with a stabilized voltage power supply A1;
a regulated power supply A1 connected to the rectifier circuit ZM1 for supplying power;
a voltage stabilizing diode D1 connected with the voltage stabilizing power supply A1, and a control circuit A2 connected with the voltage stabilizing diode D1 and used for sending a switching-on or switching-off instruction; the control circuit A2 is connected with the cathode of the voltage stabilizing diode D1, and sends out a switching-on and switching-off instruction when the voltage stabilizing power supply A1 rises to meet the operating voltage condition of a rear pole circuit;
meanwhile, the control circuit A2 is connected with a pull-in execution switch element, and the pull-in execution switch element executes an instruction of the control circuit A2 to complete the connection and disconnection of the starting circuit;
a pull-in execution switch element connected with the control circuit A2 and used for supplying current to the coil of the contactor;
a starting capacitor C2 connected with the pull-in execution switch element, and a resistor R2 connected with the starting capacitor C2 in parallel;
it should be noted that the output terminal of the regulated power supply a1 is connected to one end of a zener diode D1, the other end of the zener diode D1 is connected to one end of a resistor R1, and the other end of the resistor R1 is connected to a regulated power supply a1 and a capacitor C1;
in this embodiment, the pull-in execution switch element is a relay JK, and the relay JK is connected with a starting capacitor C2;
the working principle is as follows: according to the capacitor-based contactor direct-current starting control circuit, an alternating-current voltage is rectified and converted into a direct-current high-voltage V1 by a rectifying circuit ZM1, a stabilized voltage power supply A1 provides a working power supply for a control circuit A2, when a 220V voltage is switched on, a 2# of the control circuit A2 sends a switching-on instruction, a relay JK is switched on, contacts 1# and 2# of the relay JK are switched on, the positive electrode of a starting capacitor C2 is connected with the positive electrode of the direct-current high-voltage V1, and the negative electrode of the starting capacitor C2 is connected with the negative electrode of the direct-current high-voltage V1 through an alternating-current contactor coil to form a large-current charging loop so that the alternating-current contactor is switched on; after the alternating current contactor is closed, the No. 2 of the control circuit A2 sends out a disconnection instruction, the relay JK is released, the contacts 1# and the No. 2 of the relay JK are disconnected, the starting capacitor C2 quits working, because the two ends of the starting capacitor C2 are connected with the resistor R2 in parallel, after the starting loop quits working, the two ends of the starting capacitor C2 are high voltage, a discharge loop is formed through the resistor R2 in parallel, the voltage at the two ends of the starting capacitor C2 disappears rapidly, and preparation is made for restarting the alternating current contactor;
the utility model discloses select electric capacity according to ac contactor specification size, at ac contactor actuation in-process, can the sudden change characteristic because of starting electric capacity C2 electric current, ac contactor consequently acquires and satisfies the powerful electric current of actuation, along with the increase of starting electric capacity C2 charge time, the voltage at starting electric capacity C2 both ends is also increasing, ac contactor coil both ends voltage is by big to little, the electric current is by high to low, because the starting circuit electric current is by big to little, ensure that card starting circuit shuts off under the undercurrent state, reach and eliminate because of the high voltage, the produced reverse high pressure arouses when the heavy current divides disconnected breaking switch contact to draw the harm that the arc caused.
Examples 2,
Unlike the embodiment 1, as shown in fig. 2, a transistor T1 replaces the relay JK, and in this embodiment, the transistor T1 is connected to a starting capacitor C2.
Examples 3,
Unlike in embodiment 1, as shown in fig. 3, a MOS transistor T2 replaces the relay JK; in this embodiment, the MOS transistor T2 is connected to a start capacitor C2.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (8)
1. The utility model provides a contactor direct current starts control circuit based on electric capacity which characterized in that: the method comprises the following steps:
the device comprises a rectifying circuit ZM1 for rectifying alternating-current voltage into direct-current high voltage, a stabilized voltage power supply A1 connected with the rectifying circuit ZM1 and used for supplying power, a voltage stabilizing diode D1 connected with the stabilized voltage power supply A1, a control circuit A2 connected with the voltage stabilizing diode D1 and used for sending a switch-on or switch-off command, a pull-in execution switching element connected with the control circuit A2 and used for supplying current to a contactor coil, a starting capacitor C2 connected with the pull-in execution switching element and a resistor R2 connected with the starting capacitor C2 in parallel.
2. The dc start control circuit of claim 1, wherein: the pull-in execution switch element is a relay JK, and the relay JK is connected with a starting capacitor C2.
3. The dc start control circuit of claim 1, wherein: the pull-in execution switch element is a triode T1, and the triode T1 is connected with a starting capacitor C2.
4. The dc start control circuit of claim 1, wherein: the pull-in execution switch element is an MOS triode T2, and the MOS triode T2 is connected with a starting capacitor C2.
5. The dc start control circuit of claim 1, wherein: the output end of the rectifying circuit ZM1 is connected with a capacitor C1, and one end of the capacitor C1 is also connected with a regulated power supply A1.
6. The dc start control circuit of claim 1, wherein: the output end of the regulated power supply A1 is connected with one end of a voltage stabilizing diode D1, the other end of the voltage stabilizing diode D1 is connected with one end of a resistor R1, and the other end of the resistor R1 is connected with a regulated power supply A1 and a capacitor C1.
7. The dc start control circuit of claim 1, wherein: the control circuit A2 is connected with the cathode of the voltage stabilizing diode D1 and sends out a switch-on and switch-off instruction when the voltage stabilizing power supply A1 rises to meet the operating voltage condition of the rear pole circuit.
8. The dc start control circuit of claim 1, wherein: the control circuit A2 is connected with a pull-in execution switch element, and the pull-in execution switch element executes the instruction of the control circuit A2 to complete the connection and disconnection of the starting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220872913.2U CN217135154U (en) | 2022-04-15 | 2022-04-15 | Contactor direct current start control circuit based on electric capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220872913.2U CN217135154U (en) | 2022-04-15 | 2022-04-15 | Contactor direct current start control circuit based on electric capacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217135154U true CN217135154U (en) | 2022-08-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220872913.2U Active CN217135154U (en) | 2022-04-15 | 2022-04-15 | Contactor direct current start control circuit based on electric capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217135154U (en) |
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2022
- 2022-04-15 CN CN202220872913.2U patent/CN217135154U/en active Active
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