CN210467710U - Double-coil circuit of direct current contactor - Google Patents
Double-coil circuit of direct current contactor Download PDFInfo
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- CN210467710U CN210467710U CN201920605246.XU CN201920605246U CN210467710U CN 210467710 U CN210467710 U CN 210467710U CN 201920605246 U CN201920605246 U CN 201920605246U CN 210467710 U CN210467710 U CN 210467710U
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Abstract
The utility model relates to a double-coil circuit of a direct current contactor, which comprises an inner coil, an outer coil, an MOS tube and a capacitor C1, wherein the inner coil is positioned in the outer coil; the one end of interior coil, outer coil is connected power input end after parallelly connected, and the other end of interior coil is connected with the D utmost point of MOS pipe, and the S utmost point of MOS pipe is connected with the other end of outer coil, and connect the earthing terminal, electric capacity C1 is connected with resistance R1, resistance R2, and resistance R1 'S one end and electric capacity C1 one end, resistance R2 one end form and connect, and the resistance R1 other end is connected with the earthing terminal, and the resistance R2 other end is connected with the G utmost point of MOS pipe, and electric capacity C1' S one end is connected with power input end. When the starting device is started, current passes along a starting path, the inner coil is connected with the outer coil in parallel, the resistance is small, the starting current is large, the iron core can act, and the contact is closed; when the capacitor C1 is fully charged, the MOS tube is disconnected, the current passes along the holding path, the resistance of the outer coil is larger, the current is small, and the purpose of energy conservation can be achieved.
Description
Technical Field
The utility model relates to a double coil circuit of direct current contactor.
Background
The DC contactor needs enough electromagnetic force when starting, and does not use large electromagnetic force when keeping. In order to save energy and reduce consumption, two methods are used in the past: the first method needs to make the volume of the coil large, increase the resistance of the coil and make the input current small; the second coil has a small volume, and is designed with an energy-saving plate, so that the input current is converted into a small current within 200ms after the contactor is started. The disadvantages of the two are that the first one is that the product is very bulky and heavy; the second is susceptible to EMC interference, resulting in contact bounce.
Disclosure of Invention
To the above problem, the utility model aims at providing a rational in infrastructure, energy-conserving direct current contactor twin coil circuit.
Realize the technical scheme of the utility model as follows
The double-coil circuit of the direct current contactor comprises an inner coil, an outer coil, an MOS (metal oxide semiconductor) tube and a capacitor C1, wherein the inner coil is positioned in the outer coil; the one end of interior coil, outer coil is connected power input end after parallelly connected, and the other end of interior coil is connected with the D utmost point of MOS pipe, and the S utmost point of MOS pipe is connected with the other end of outer coil, and connect the earthing terminal, electric capacity C1 is connected with resistance R1, resistance R2, and resistance R1 'S one end and electric capacity C1 one end, resistance R2 one end form and connect, and the resistance R1 other end is connected with the earthing terminal, and the resistance R2 other end is connected with the G utmost point of MOS pipe, and electric capacity C1' S one end is connected with power input end.
Furthermore, the inner coil enameled wire diameter is larger than the outer coil enameled wire diameter, the number of turns of the inner coil enameled wire is smaller than that of the outer coil enameled wire, and the resistance of the inner coil is smaller than that of the outer coil.
Further, a diode D1 is connected between the inner coil and the D pole of the MOS transistor, a TVS transistor D2 is connected between the D pole of the MOS transistor and the power input terminal, a TVS transistor D3 is connected between the G pole of the MOS transistor and the ground terminal, and a TVS transistor D4 is connected between the D pole of the MOS transistor, the diode D1 and the ground terminal.
Furthermore, the outer coil is wound into a ring, and the middle part of the outer coil is an accommodating space of the inner coil.
By adopting the technical scheme, when the starting is carried out, the current passes along the starting path, the inner coil is connected with the outer coil in parallel, the resistance is very small, the starting current is large, the iron core can act, and the contact is closed; when the capacitor C1 is fully charged, the MOS tube is disconnected, the current passes along the holding path, the resistance of the outer coil is larger, the current is small, and the purpose of energy conservation can be achieved; the circuit has the advantages of few adopted devices, simple manufactured circuit board, energy-saving effect, simple structure of the circuit board assembly and difficult EMC interference.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention;
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
As shown in FIG. 1, the DC contactor has a double-coil circuit including an inner coil RInner partOuter coil ROuter coverThe MOS tube Q1 and the capacitor C1 are arranged in the outer coil; the inner coil, the one end of outer coil is connected power input end after being connected in parallel, the other end of inner coil is connected with MOS pipe Q1 'S D utmost point, MOS pipe Q1' S the S utmost point is connected with the other end of outer coil, and connect the earthing terminal, electric capacity C1 is connected with resistance R1, resistance R2, resistance R1 'S one end and electric capacity C1 one end, resistance R2 one end forms and connects in parallel, the resistance R1 other end is connected with the earthing terminal, the resistance R2 other end is connected with the G utmost point of MOS pipe, electric capacity C1' S one end is connected with power input end.
The inner coil enameled wire diameter is larger than the outer coil enameled wire diameter, the number of turns of the inner coil enameled wire is smaller than that of the outer coil enameled wire, and the resistance of the inner coil is smaller than that of the outer coil.
The diode D1 is connected between the D utmost point of interior coil and MOS pipe, and the D utmost point and the power input end of MOS pipe are connected with TVS pipe D2, and the G utmost point and the earthing terminal of MOS pipe are connected with TVS pipe D3, are connected with TVS pipe D4 between the D utmost point of MOS pipe, diode D1 and the earthing terminal.
The outer coil is wound into a ring, and the middle part of the outer coil is an accommodating space of the inner coil.
The working process of the circuit is as follows:
① at the moment of power supply startup, the capacitor C1 charges, and at this time, there is current flow between G pole and S pole of MOS transistor Q1, Q1 is conducted, coil current flows along the startup path (such as the startup path shown in FIG. 1), and inner and outer coils R of the coilInner partAnd ROuter coverAnd (4) connecting in parallel.
And the resistor R1 limits the current of the circuit at the moment of starting and prevents the anode and the cathode of the power supply from being short-circuited.
And the resistor R2 limits the current flowing through the Q1 and prevents the MOS tube from being burnt out.
The TVS tube D3 limits the voltage loaded on the Q1 and prevents the MOS tube from breaking down.
② shortly after start-up, capacitor C1 is fully charged, MOS transistor Q1 is turned off, and coil R is turned offInner partOpen and current passes along a holding path (such as the holding path shown in fig. 1). The TVS tubes D2 and D4 limit the back electromotive force generated when the coil is turned off.
Claims (4)
1. The double-coil circuit of the direct current contactor is characterized by comprising an inner coil, an outer coil, an MOS (metal oxide semiconductor) tube and a capacitor C1, wherein the inner coil is positioned in the outer coil;
one end of the inner coil and one end of the outer coil are connected in parallel and then connected with the input end of the power supply,
the other end of the inner coil is connected with the D pole of the MOS tube, the S pole of the MOS tube is connected with the other end of the outer coil and is connected with the grounding end,
the capacitor C1 is connected with a resistor R1 and a resistor R2, one end of the resistor R1 is connected with one end of the capacitor C1 and one end of the resistor R2 in parallel, the other end of the resistor R1 is connected with a grounding end, the other end of the resistor R2 is connected with the G pole of the MOS tube, and one end of the capacitor C1 is connected with a power supply input end.
2. The dual coil circuit of dc contactor as claimed in claim 1, wherein the inner coil enameled wire diameter is larger than the outer coil enameled wire diameter, the number of turns of the inner coil enameled wire is smaller than the number of turns of the outer coil enameled wire, and the resistance of the inner coil is smaller than the resistance of the outer coil.
3. The dual-coil circuit of the dc contactor as claimed in claim 1, wherein a diode D1 is connected between the internal coil and the D pole of the MOS transistor, a TVS transistor D2 is connected to the D pole of the MOS transistor and the power input terminal, a TVS transistor D3 is connected to the G pole of the MOS transistor and the ground terminal, and a TVS transistor D4 is connected between the D pole of the MOS transistor, the diode D1 and the ground terminal.
4. The dual coil circuit of a dc contactor as claimed in claim 1, wherein the outer coil is wound in a ring shape with a space for accommodating the inner coil in the middle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920605246.XU CN210467710U (en) | 2019-04-29 | 2019-04-29 | Double-coil circuit of direct current contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920605246.XU CN210467710U (en) | 2019-04-29 | 2019-04-29 | Double-coil circuit of direct current contactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210467710U true CN210467710U (en) | 2020-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920605246.XU Active CN210467710U (en) | 2019-04-29 | 2019-04-29 | Double-coil circuit of direct current contactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210467710U (en) |
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2019
- 2019-04-29 CN CN201920605246.XU patent/CN210467710U/en active Active
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