Control circuit compatible with single and double drive coil closing and opening

Abstract

The application discloses a control circuit compatible with single and double drive coil opening and closing, which comprises a first IGBT, a first terminal short-circuit point, a second IGBT and a third IGBT and a fourth IGBT which are connected in series, and the sources of the second IGBT and the fourth IGBT are connected to the ground; further comprising a first drive coil, two ends of which are connected between the first IGBT and the first terminal short-circuit point and between the third IGBT and the fourth IGBT respectively; further comprising a second drive coil and a second terminal short-circuit point which are connected in series, and the other end of the second terminal short-circuit point is connected between the first terminal short-circuit point and the second IGBT; the other end of the second drive coil and the drain of the third IGBT are connected to a high-voltage energy storage capacitor for opening, and the drain of the first IGBT is connected to a high-voltage energy storage capacitor for closing. The control circuit can be compatible with single and double drive coil opening and closing, and has good compatibility.

Description

Technical Field

[0001] This invention relates to the field of operating mechanism control technology, and in particular to a control circuit compatible with single and dual drive coil opening and closing. Background Technology

[0002] With the rapid development of intelligent construction in my country's railway, rail transit, and power grid industries, research on the intelligentization of electrical equipment has become a focus of attention. The application of high and low voltage switches equipped with permanent magnet operating mechanisms is increasing. Current technology generally uses push-button switches to connect opening and closing signals to a contactor to control the discharge of a high-voltage energy storage capacitor, thereby driving the excitation coil. Currently, this is basically a single-drive coil or dual-drive coil structure, which cannot be compatible with both single and dual-drive coils, leading to increased operating costs. Moreover, this type of device has a short lifespan, poor real-time performance and reliability, and lacks intelligence and automation. Therefore, how to achieve compatible and reliable control of permanent magnet operating mechanisms is an urgent problem to be solved. Summary of the Invention

[0003] This invention provides a control circuit compatible with both single and dual drive coils for opening and closing, in order to solve the problem of poor compatibility of existing opening and closing control circuits.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] A control circuit compatible with single and dual drive coils for opening and closing circuits includes a first IGBT, a first terminal shorting point, a second IGBT, and a third and fourth IGBT connected in series, with the sources of the second and fourth IGBTs both grounded; it also includes a first drive coil, with its two ends connected between the first IGBT and the first terminal shorting point, and between the third and fourth IGBTs, respectively; it further includes a second drive coil and a second terminal shorting point connected in series, with the other end of the second terminal shorting point connected between the first terminal shorting point and the second IGBT; the other end of the second drive coil and the drain of the third IGBT are connected to a high-voltage energy storage capacitor for opening circuits, and the drain of the first IGBT is connected to a high-voltage energy storage capacitor for closing circuits.

[0006] Furthermore, it also includes a clamping circuit connected in parallel with the first drive coil.

[0007] Furthermore, the clamping circuit includes a first diode, a first resistor, and a capacitor, wherein the first resistor and the capacitor are connected in parallel and then in series with the first diode.

[0008] Furthermore, it also includes a freewheeling diode connected in parallel with the second coil.

[0009] Furthermore, it also includes four IGBT control circuits that are respectively connected to the gates of the first IGBT, the second IGBT, the third IGBT, and the fourth IGBT.

[0010] Furthermore, the IGBT control circuit includes a second resistor, a third resistor, a fourth resistor, a first Zener diode, a second Zener diode, and an optocoupler; the second resistor is connected to the input terminal of the optocoupler, the third resistor is connected between the output terminal of the optocoupler and the gate of the corresponding controlled IGBT, the first Zener diode, the second Zener diode, and the fourth resistor are connected in series between the output terminal of the optocoupler and the gate of the corresponding controlled IGBT, and the second Zener diode and the fourth resistor are grounded.

[0011] Furthermore, it also includes an MCU, which is connected to four IGBT control circuits.

[0012] Furthermore, it also includes an energy storage control circuit, which includes a second diode, a fifth resistor, and a first energy storage capacitor connected in series between the positive and negative terminals of the charging power supply; it also includes a first branch and a second branch connected between the fifth resistor and the first energy storage capacitor; the first branch is connected to the drain of the first IGBT; the second branch includes a third diode, a first MOSFET, and a sixth resistor connected in series, with the other end of the sixth resistor connected to the drain of the third IGBT and the second drive coil.

[0013] Furthermore, the energy storage control circuit also includes a second MOSFET and a second energy storage capacitor. The third diode, the first MOSFET, the second MOSFET, and the second energy storage capacitor are connected in series and then connected in parallel with the first energy storage capacitor. The sixth resistor is connected between the first MOSFET and the second MOSFET.

[0014] Furthermore, it also includes a first MOS transistor control circuit and a second MOS transistor control circuit that are respectively connected to the gates of the first MOS transistor and the second MOS transistor.

[0015] This invention proposes a control circuit compatible with both single and dual drive coils for opening and closing. In single-coil mode, the first terminal short-circuit is closed, the second terminal short-circuit is open, and only the first drive coil is connected. When closing, the first and fourth IGBTs are energized, the first drive coil is powered, and the control switch closes. When opening, the second and third IGBTs are energized, the first drive coil is powered, and the control switch opens. The current direction of the first drive coil is opposite during closing and opening. In dual-coil mode, the first terminal short-circuit is open, the second terminal short-circuit is closed. When closing, the first and fourth IGBTs are energized, the first drive coil is powered, and the control switch closes. When opening, the second IGBT is energized, the second drive coil is powered, and the control switch opens. Furthermore, a discrete isolation drive scheme is proposed, and the IGBT dead time is controlled by the MCU, significantly reducing costs, improving real-time performance and reliability, and enhancing the level of intelligence and automation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a control circuit for opening and closing circuits compatible with single and dual drive coils provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the energy storage control circuit provided in an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] In the description of this invention, it should be understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element present. The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or order. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means at least two.

[0021] like Figure 1 As shown, this embodiment of the invention provides a control circuit compatible with single and dual drive coils for opening and closing the circuit. It includes a first IGBT Q6, a first terminal shorting point JP1, a second IGBT Q9, and a third IGBT Q4 and a fourth IGBT Q7 connected in series. The sources of the second IGBT Q9 and the fourth IGBT are both grounded. It also includes a first drive coil JP4, with its two ends connected between the first IGBT Q6 and the first terminal shorting point JP1, and between the third IGBT Q4 and the fourth IGBT Q7, respectively. Furthermore, it includes a second drive coil JP6 and a second terminal shorting point JP2 connected in series. The other end of the second terminal shorting point JP2 is connected between the first terminal shorting point JP1 and the second IGBT Q9. The other end of the second drive coil JP6 and the drain of the third IGBT Q4 are connected to the output terminal U2+ of the high-voltage energy storage capacitor for opening the circuit. The drain of the first IGBT Q6 is connected to the output terminal U1+ of the high-voltage energy storage capacitor for closing the circuit. It also includes four IGBT control circuits connected to the gates of the first, second, third, and fourth IGBTs, respectively. The four IGBT control circuits have the same structure and are all connected to the MCU, that is, the MCU controls whether the first IGBT, the second IGBT, the third IGBT, and the fourth IGBT are turned on or off.

[0022] Specifically, the IGBT control circuit includes a second resistor, a third resistor, a fourth resistor, a first Zener diode, a second Zener diode, and an optocoupler; the second resistor is connected to the input terminal of the optocoupler, the third resistor is connected between the output terminal of the optocoupler and the gate of the corresponding controlled IGBT, the first Zener diode, the second Zener diode, and the fourth resistor are connected in series between the output terminal of the optocoupler and the gate of the corresponding controlled IGBT, and the second Zener diode and the fourth resistor are grounded.

[0023] Preferably, the system further includes a clamping circuit connected in parallel with the first drive coil. The clamping circuit includes a first diode D20, a first resistor R60, and a capacitor C60. The first resistor R60 and capacitor C60 are connected in parallel and then in series with the first diode D20. The clamping circuit is mainly used for peak absorption of the drive coil. The system also includes a freewheeling diode connected in parallel with the second coil. The direction of the freewheeling diode is from the second terminal short-circuit point JP2 to the output terminal U2+ of the high-voltage energy storage capacitor.

[0024] This control circuit can achieve opening and closing control compatible with single and dual drive coils. The specific working principle is as follows.

[0025] Single coil mode: The first terminal shorting point JP1 is closed, and the second terminal shorting point JP2 is open; 1) such as Figure 1As shown, when the MCU sends the closing signals Pro_on1 and Pro_on2, optocouplers N8 and N14 are turned on, the gates of the first IGBT Q6 and the fourth IGBT Q7 are respectively high-level, the drain and source are connected, the first drive coil JP4 of the operating mechanism is energized, and the control switch is closed; the current direction of the first drive coil JP4 is left-in and right-out; 2) When the MCU sends the opening signals Pro_off1 and Pro_off2, optocouplers N12 and N15 are turned on, the gates of the third IGBT Q4 and the second IGBT Q9 are respectively high-level, the drain and source are connected, the first drive coil JP4 of the operating mechanism is energized, and the control switch is opened; the current direction of the first drive coil JP4 is right-in and left-out.

[0026] Dual-coil mode: The first terminal shorting point JP1 is open, the second terminal shorting point JP2 is closed, the first drive coil JP4 is the closing drive coil, and the second drive coil JP6 is the opening drive coil; 1) such as Figure 1 When the MCU sends the closing signal Pro_on1 and Pro_on2, optocouplers N8 and N14 are turned on, the gates of the first IGBT Q6 and the fourth IGBT Q7 are respectively high-level, the drain and source are connected, the first drive coil JP4 of the operating mechanism is energized, and the control switch is closed; 2) When the MCU sends the opening signal Pro_off2, optocoupler N15 is turned on, the gate of the second IGBT Q9 is high-level, the drain and source are connected, the second drive coil JP6 of the operating mechanism is energized, and the control switch is opened.

[0027] To address the issue of existing energy storage control circuits lacking backup capacitors and exhibiting relatively poor overall reliability, this invention also provides an energy storage control circuit for use in conjunction with a control circuit compatible with single and dual drive coil switching. Specifically, as shown in... Figure 2 As shown, the energy storage control circuit includes a second diode D1, a fifth resistor R67, and a first energy storage capacitor C39 connected in series between the positive and negative terminals of the charging power supply; it also includes a first branch connected between the fifth resistor R67 and the first energy storage capacitor C39, and a second branch connected in parallel with the first energy storage capacitor C39; the first branch is connected to the drain of the first IGBT and provides power for closing; the second branch includes a third diode D5, a first MOSFET Q10, a second MOSFET Q11, and a second energy storage capacitor C45 connected in series, and a sixth resistor R83 connected between the first MOSFET Q10 and the second MOSFET Q11. The other end of the sixth resistor R83 is connected to the drain of the third IGBT and the second drive coil and provides power for opening.

[0028] like Figure 2As shown, the energy storage control circuit also includes a first MOSFET control circuit and a second MOSFET control circuit, respectively connected to the gates of the first MOSFET and the second MOSFET. Both the first MOSFET control circuit and the second MOSFET control circuit are connected to the MCU. The first MOSFET control circuit and the second MOSFET control circuit have the same structure. Taking the first MOSFET control circuit as an example, the first MOSFET control circuit includes resistors RS16 and R94, Zener diodes DZ9 and DZ10, and an optocoupler N16. Resistor RS16 is connected to the input terminal of optocoupler N16. Zener diodes DZ9 and DZ10, and resistor R94 are connected in series between the output terminal of optocoupler N16 and the gate of the first MOSFET Q10. Zener diode DZ10 and resistor R94 are grounded. The two Zener diodes are used to protect the gates of the MOSFETs.

[0029] Under normal circumstances: the second diode D1, the fifth resistor R67, and the first energy storage capacitor C39 form the closing capacitor charging module, and network U1+ is the closing energy storage output. The second diode D1, the fifth resistor R67, the third diode D5, the first MOSFET Q10, the second MOSFET Q11, and the second energy storage capacitor C45 form the opening capacitor charging module, and the sixth resistor R83 is the opening discharge current limiting resistor, and network U2+ is the opening energy storage output. When the voltage of the second energy storage capacitor C45 (i.e., the opening capacitor) is abnormal, the MCU controls the second MOSFET Q11 to disconnect, cutting off the fault circuit, and controls the first MOSFET Q10 to conduct, supplying power to the U2+ output port to provide the opening energy storage output; at this time, the first energy storage capacitor C39 becomes the main capacitor, equivalent to a backup solution for the opening capacitor C45.

[0030] Of course, in other embodiments, when cost or space constraints, or installation space limitations, allow only one energy storage capacitor to be installed, the second MOSFET Q11 and the second energy storage capacitor C45 are not installed. The MCU controls the first MOSFET Q10 to power the U2+ output port, providing a tripped energy storage output.

[0031] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A control circuit compatible with single and dual drive coils for opening and closing, characterized in that, The system includes a first IGBT, a first terminal shorting point, a second IGBT, and a third IGBT and a fourth IGBT connected in series, with the sources of the second and fourth IGBTs grounded; it also includes a first drive coil, with its two ends connected between the first IGBT and the first terminal shorting point, and between the third and fourth IGBTs, respectively; it also includes a second drive coil and a second terminal shorting point connected in series, with the other end of the second terminal shorting point connected between the first terminal shorting point and the second IGBT; the other end of the second drive coil and the drain of the third IGBT are connected to a high-voltage energy storage capacitor for tripping, and the drain of the first IGBT is connected to a high-voltage energy storage capacitor for gate closing; It also includes four IGBT control circuits that are respectively connected to the gates of the first IGBT, the second IGBT, the third IGBT, and the fourth IGBT; It also includes an MCU, which is connected to four IGBT control circuits; It also includes an energy storage control circuit, which includes a second diode, a fifth resistor, and a first energy storage capacitor connected in series between the positive and negative terminals of the charging power supply; it also includes a first branch and a second branch connected between the fifth resistor and the first energy storage capacitor; the first branch is connected to the drain of the first IGBT; the second branch includes a third diode, a first MOSFET, and a sixth resistor connected in series, with the other end of the sixth resistor connected to the drain of the third IGBT and the second drive coil.

2. The control circuit for opening and closing compatible with single and dual drive coils according to claim 1, characterized in that, It also includes a clamping circuit connected in parallel with the first drive coil.

3. The control circuit for opening and closing compatible with single and dual drive coils according to claim 2, characterized in that, The clamping circuit includes a first diode, a first resistor, and a capacitor. The first resistor and the capacitor are connected in parallel and then in series with the first diode.

4. The control circuit for opening and closing circuits compatible with single and dual drive coils according to claim 1, characterized in that, It also includes a freewheeling diode connected in parallel with the second coil.

5. The control circuit for opening and closing circuits compatible with single and dual drive coils according to claim 1, characterized in that, The IGBT control circuit includes a second resistor, a third resistor, a fourth resistor, a first Zener diode, a second Zener diode, and an optocoupler; the second resistor is connected to the input terminal of the optocoupler, the third resistor is connected between the output terminal of the optocoupler and the gate of the corresponding controlled IGBT, the first Zener diode, the second Zener diode, and the fourth resistor are connected in series between the output terminal of the optocoupler and the gate of the corresponding controlled IGBT, and the second Zener diode and the fourth resistor are grounded.

6. The control circuit for opening and closing compatible with single and dual drive coils according to claim 1, characterized in that, The energy storage control circuit also includes a second MOSFET and a second energy storage capacitor. The third diode, the first MOSFET, the second MOSFET, and the second energy storage capacitor are connected in series and then connected in parallel with the first energy storage capacitor. The sixth resistor is connected between the first MOSFET and the second MOSFET.

7. The control circuit for opening and closing compatible with single and dual drive coils according to claim 6, characterized in that, It also includes a first MOS transistor control circuit and a second MOS transistor control circuit that are respectively connected to the gates of the first MOS transistor and the second MOS transistor.

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