Locking control circuit of high-voltage live display

Abstract

The utility model discloses a locking control circuit of a high-voltage live display, which comprises an optical coupler isolation circuit, an RC (Resistance-Capacitance) voltage stabilizing circuit, a rectifying circuit, a switching tube switching circuit and a power supply input circuit, the output side of the optical coupler isolation circuit is connected with the input end of the RC voltage stabilizing circuit and the output end of the power input circuit, the output end of the RC voltage stabilizing circuit is connected with the control end of the switching tube switching circuit, the output end of the switching tube switching circuit is grounded, and the input end of the switching tube switching circuit is connected with the first input end of the rectifying circuit. The first input end and the second input end of the rectifying circuit are connected with the output end of the power input circuit and the second power connecting end respectively, the output end of the rectifying circuit is connected with the locking device control end, the grounding end of the rectifying current is connected with the second ground, and the input end of the power input circuit is connected with the first power connecting end. According to the utility model, no extra control power supply is needed, and the layout is simpler and more convenient.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage electrical equipment, and in particular to a locking control circuit for a high-voltage live display. Background Technology

[0002] Existing high-voltage live-line display systems consist of high-voltage capacitive sensors and corresponding high-voltage live-line indicators. These indicators are typically installed on incoming busbars, circuit breakers, main transformers, switchgear, GIS switchgear, and other high-voltage electrical equipment requiring energization. High-voltage live-line indicators usually include interlocking functions to prevent electrical misoperation and potential safety accidents.

[0003] Existing high-voltage live-line indicator interlocking control circuits typically employ relays to control the downstream interlocking device. This approach requires the high-voltage live-line indicator to provide a separate control power supply for the relay's control circuit. This results in a complex structure for both the control power supply circuit and the interlocking control circuit, leading to higher costs and a larger circuit size. In specific operating environments, such as inside ring main units, limitations such as compact space layout, difficulties in power wiring, limited installation space for the indicator, and inconvenience in obtaining auxiliary power make it difficult to provide control power to the relay's control circuit in the high-voltage live-line indicator's interlocking control circuit.

[0004] In view of the above problems, it is necessary to study a lockout control circuit for a high-voltage live display, which does not require an additional control power supply and is simpler and more convenient to install. Utility Model Content

[0005] The purpose of this invention is to provide a locking control circuit for a high-voltage live display, which does not require an additional control power supply and is simpler and more convenient to install.

[0006] To achieve the above objectives, the solution of this utility model is:

[0007] A latching control circuit for a high-voltage live display includes an optocoupler isolation circuit, an RC voltage regulator circuit, a rectifier circuit, a switching transistor circuit, a power input circuit, a live display control terminal XH, a first power connection terminal L / +, a second power connection terminal N / -, and a latching device control terminal K. The positive input terminal of the optocoupler isolation circuit is connected to the live display control terminal XH, which is used to connect to the high-voltage live display circuit of the high-voltage live display. The negative input terminal of the optocoupler isolation circuit is connected to a first ground. The positive output terminal of the optocoupler isolation circuit is connected to the input terminal of the RC voltage regulator circuit and the output terminal of the power input circuit. The output terminal is connected to the control terminal of the switching transistor circuit. The output terminal of the switching transistor circuit is grounded. The input terminal of the switching transistor circuit is connected to the first input terminal of the rectifier circuit. The first and second input terminals of the rectifier circuit are respectively connected to the output terminal and the second power connection terminal N / - of the power input circuit. The output terminal of the rectifier circuit is connected to the control terminal K of the locking device. The grounding terminal of the rectified current is connected to the second ground. The input terminal of the power input circuit is connected to the first power connection terminal L / +. The first power connection terminal L / +, the second power connection terminal N / -, and the control terminal K of the locking device are used to connect to the first power terminal, the second power terminal, and the control terminal of the locking device, respectively.

[0008] The optocoupler isolation circuit includes optocoupler U1.

[0009] The positive output terminal of the optocoupler isolation circuit is connected to the input terminal of the RC voltage regulator circuit and the output terminal of the power input circuit through a transistor switching circuit; the control terminal of the transistor switching circuit is connected to the positive output terminal of the optocoupler isolation circuit, the input terminal of the transistor switching circuit is connected to the input terminal of the RC voltage regulator circuit and the output terminal of the power input circuit, and the output terminal of the transistor switching circuit is grounded.

[0010] The input terminal of the transistor switching circuit is connected to the output terminal of the power input circuit through a protection circuit.

[0011] The protection circuit includes a resistor R4, with the first end of the resistor R4 connected to the output terminal of the power input circuit and the second end of the resistor R4 connected to the input terminal of the transistor switching circuit.

[0012] The transistor switching circuit includes a transistor Q2 and a resistor R7. The first end of the resistor R7 and the emitter of the transistor Q2 are connected to the input terminal of the transistor switching circuit. The second end of the resistor R7 and the base of the transistor Q2 are connected to the control terminal of the transistor switching circuit. The collector of the transistor Q2 is connected to the output terminal of the transistor switching circuit.

[0013] The first input terminal of the rectifier circuit and the input terminal of the switching transistor circuit are connected to the output terminal of the power input circuit through a latching indicator circuit.

[0014] The lockout indicator circuit includes resistor R2, resistor R3, diode D2, and indicator LED1; the first end of resistor R3 is connected to the output terminal of the power input circuit, the second end of resistor R3 is connected to the first end of resistor R2 and the positive terminal of diode D2, the negative terminal of diode D2 is connected to the first input terminal of the rectifier circuit and the input terminal of the switching transistor circuit, the second end of resistor R2 is connected to the positive terminal of indicator LED1, and the negative terminal of indicator LED1 is connected to the second ground.

[0015] The power input circuit includes a diode D1, a resistor R1, and a capacitor C1. The positive terminal of the diode D1 is connected to the input terminal of the power input circuit, the negative terminal of the diode D1 is connected to the first terminal of the resistor R1, the second terminal of the resistor R1 and the first terminal of the capacitor C1 are connected to the output terminal of the power input circuit, and the second terminal of the capacitor C1 is connected to the second ground.

[0016] The switching circuit includes a MOSFET Q1, with the drain, source, and gate of Q1 connected to the input, output, and control terminals of the switching circuit, respectively. The rectifier circuit includes a rectifier bridge BD1. The RC regulator circuit includes a capacitor C2 and a resistor R5, with the first end of resistor R5 and the first end of capacitor C2 connected to the input terminal of the RC regulator circuit, the second end of capacitor C2 connected to a second ground, and the second end of resistor R5 connected to the output terminal of the RC regulator circuit.

[0017] After adopting the above scheme, when this utility model is in use, the live display control terminal XH is connected to the high voltage live display circuit of the high voltage live display, and the first power connection terminal L / +, the second power connection terminal N / - and the locking device control terminal K are respectively connected to the first power terminal, the second power terminal and the control terminal of the locking device.

[0018] When the high-voltage live display circuit detects that the high-voltage electrical equipment is live, the high-voltage live display circuit will input a pulse signal to the live display control terminal XH, which will cause the optocoupler isolation circuit to conduct intermittently, thereby causing the RC voltage regulator circuit to discharge and pull down the control terminal voltage of the switching transistor circuit, so that the switching transistor circuit is in the off state, and the rectifier circuit outputs voltage to the control terminal of the locking device, so that the locking device locks.

[0019] When the high-voltage live display circuit detects that the high-voltage electrical equipment is not energized, the high-voltage live display circuit does not input a signal to the live display control terminal XH. At this time, the optocoupler isolation circuit is cut off, which in turn allows the power input circuit to provide voltage to the control terminal of the switching transistor circuit through the RC voltage regulator circuit, so that the switching transistor circuit is in the conducting state and the rectifier circuit does not output voltage to the control terminal of the interlocking device, thereby unlocking the interlocking device.

[0020] As can be seen from the above, the interlocking control circuit of the high-voltage live display of this utility model can realize the control of the interlocking device without the need for an additional control power supply, and the installation is simpler and more convenient. Attached Figure Description

[0021] Figure 1 This is the circuit schematic diagram of this utility model.

[0022] Figure 2 This is a schematic diagram illustrating the use of this utility model. Detailed Implementation

[0023] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0024] like Figure 1 and Figure 2 As shown, this utility model discloses a latching control circuit for a high-voltage live display, which includes an optocoupler isolation circuit, an RC voltage regulator circuit, a rectifier circuit, a switching transistor circuit, a power input circuit, a live display control terminal XH, a first power connection terminal L / +, a second power connection terminal N / -, and a latching device control terminal K. The positive input terminal of the optocoupler isolation circuit is connected to the live display control terminal XH, which is used to connect to the high-voltage live display circuit of the high-voltage live display. The negative input terminal of the optocoupler isolation circuit is connected to a first ground. The positive output terminal of the optocoupler isolation circuit is connected to the input terminal of the RC voltage regulator circuit and the output terminal of the power input circuit. The output of the RC voltage regulator circuit is connected to the control terminal of the switching transistor circuit. The output of the switching transistor circuit is grounded. The input of the switching transistor circuit is connected to the first input terminal of the rectifier circuit. The first and second input terminals of the rectifier circuit are respectively connected to the output terminal of the power input circuit and the second power connection terminal N / -. The output of the rectifier circuit is connected to the control terminal K of the locking device. The grounding terminal of the rectified current is connected to the second ground. The input terminal of the power input circuit is connected to the first power connection terminal L / +. The first power connection terminal L / +, the second power connection terminal N / -, and the control terminal K of the locking device are used to connect to the first power terminal, the second power terminal, and the control terminal of the locking device, respectively.

[0025] Cooperate Figure 2 As shown, in use, the live display control terminal XH is connected to the high voltage live display circuit of the high voltage live display, and the first power connection terminal L / +, the second power connection terminal N / - and the locking device control terminal K are respectively connected to the first power terminal, the second power terminal and the control terminal of the locking device.

[0026] When the high-voltage live display circuit detects that the high-voltage electrical equipment is live, the high-voltage live display circuit will input a pulse signal to the live display control terminal XH, which will cause the optocoupler isolation circuit to conduct intermittently, thereby causing the RC voltage regulator circuit to discharge and pull down the control terminal voltage of the switching transistor circuit, so that the switching transistor circuit is in the off state, and the rectifier circuit outputs voltage to the control terminal of the locking device, so that the locking device locks.

[0027] When the high-voltage live display circuit detects that the high-voltage electrical equipment is not energized, the high-voltage live display circuit does not input a signal to the live display control terminal XH. At this time, the optocoupler isolation circuit is cut off, which in turn allows the power input circuit to provide voltage to the control terminal of the switching transistor circuit through the RC voltage regulator circuit, so that the switching transistor circuit is in the conducting state and the rectifier circuit does not output voltage to the control terminal of the interlocking device, thereby unlocking the interlocking device.

[0028] As can be seen from the above, the interlocking control circuit of the high-voltage live display of this utility model can realize the control of the interlocking device without the need for an additional control power supply, and the installation is simpler and more convenient.

[0029] In embodiments of this utility model, the optocoupler isolation circuit may include optocoupler U1; the rectifier circuit may include rectifier bridge BD1; the switching transistor circuit may include MOSFET Q1, with the drain, source, and gate of MOSFET Q1 connected to the input, output, and control terminals of the switching transistor circuit, respectively; the RC voltage regulator circuit may include capacitor C2 and resistor R5, with the first end of resistor R5 and the first end of capacitor C2 connected to the input terminal of the RC voltage regulator circuit, the second end of capacitor C2 connected to a second ground, and the second end of resistor R5 connected to the output terminal of the RC voltage regulator circuit; the power input circuit may include diode D1, resistor R1, and capacitor C1, with the anode of diode D1 connected to the input terminal of the power input circuit, the cathode of diode D1 connected to the first end of resistor R1, the second end of resistor R1 and the first end of capacitor C1 connected to the output terminal of the power input circuit, and the second end of capacitor C1 connected to a second ground.

[0030] In an embodiment of this invention, the positive output terminal of the optocoupler isolation circuit is connected to the input terminal of the RC voltage regulator circuit and the output terminal of the power input circuit via a transistor switching circuit. The control terminal of the transistor switching circuit is connected to the positive output terminal of the optocoupler isolation circuit, the input terminal of the transistor switching circuit is connected to the input terminal of the RC voltage regulator circuit and the output terminal of the power input circuit, and the output terminal of the transistor switching circuit is grounded. Specifically, the transistor switching circuit may include a transistor Q2 and a resistor R7. The first terminal of resistor R7 and the emitter of transistor Q2 are connected to the input terminal of the transistor switching circuit, the second terminal of resistor R7 and the base of transistor Q2 are connected to the control terminal of the transistor switching circuit, and the collector of transistor Q2 is connected to the output terminal of the transistor switching circuit. When the optocoupler isolation circuit is on, the transistor switching circuit is also on, causing the capacitor C2 of the RC voltage regulator circuit to discharge faster. When the optocoupler isolation circuit is off, the transistor switching circuit is also off.

[0031] In an embodiment of this invention, the input terminal of the transistor switching circuit can be connected to the output terminal of the power input circuit via a protection circuit, which can protect transistor Q2. The protection circuit may include resistor R4, with its first end connected to the output terminal of the power input circuit and its second end connected to the input terminal of the transistor switching circuit. Resistor R4 can provide current limiting protection.

[0032] In an embodiment of this invention, the first input terminal of the rectifier circuit and the input terminal of the switching transistor circuit are connected to the output terminal of the power input circuit via a latching indicator circuit. When the latching control circuit of this invention controls the latching device to lock, the latching indicator circuit lights up simultaneously; when the latching control circuit of this invention controls the latching device to unlock, the latching indicator circuit turns off simultaneously; thus facilitating the user to determine the status of the latching device.

[0033] In an embodiment of this utility model, the locking indicator circuit includes resistor R2, resistor R3, diode D2, and indicator LED1. The first end of resistor R3 is connected to the output terminal of the power input circuit. The second end of resistor R3 is connected to the first end of resistor R2 and the anode of diode D2. The cathode of diode D2 is connected to the first input terminal of the rectifier circuit and the input terminal of the switching transistor circuit. The second end of resistor R2 is connected to the anode of indicator LED1, and the cathode of indicator LED1 is connected to a second ground. When the switching transistor circuit is in the off state, causing the locking device to lock, the indicator LED1 of the locking indicator circuit has current flowing through it and lights up. When the switching transistor circuit is in the on state, causing the locking device to unlock, the indicator LED1 of the locking indicator circuit has no current flowing through it and goes out.

[0034] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A locking control circuit for a high-voltage live display, characterized in that: It includes an optocoupler isolation circuit, an RC voltage regulator circuit, a rectifier circuit, a switching transistor circuit, a power input circuit, a live display control terminal XH, a first power connection terminal L / +, a second power connection terminal N / -, and a latching device control terminal K. The positive input terminal of the optocoupler isolation circuit is connected to the live display control terminal XH. The live display control terminal XH is used to connect to the high voltage live display circuit of the high voltage live display. The negative input terminal of the optocoupler isolation circuit is connected to the first ground. The positive output terminal of the optocoupler isolation circuit is connected to the input terminal of the RC voltage regulator circuit and the output terminal of the power input circuit. The output terminal of the RC voltage regulator circuit is connected to the control terminal of the switching transistor circuit. The output terminal of the switching transistor circuit is grounded. The input terminal of the switching transistor circuit is connected to the first input terminal of the rectifier circuit. The first and second input terminals of the rectifier circuit are respectively connected to the output terminal of the power input circuit and the second power connection terminal N / -. The output terminal of the rectifier circuit is connected to the control terminal K of the locking device. The grounding terminal of the rectified current is connected to the second ground. The input terminal of the power input circuit is connected to the first power connection terminal L / +. The first power connection terminal L / +, the second power connection terminal N / -, and the control terminal K of the locking device are used to connect to the first power terminal, the second power terminal, and the control terminal of the locking device, respectively.

2. The interlocking control circuit for a high-voltage live display as described in claim 1, characterized in that: The optocoupler isolation circuit includes optocoupler U1.

3. The interlocking control circuit for a high-voltage live display as described in claim 1, characterized in that: The positive output terminal of the optocoupler isolation circuit is connected to the input terminal of the RC voltage regulator circuit and the output terminal of the power input circuit through a transistor switching circuit. The control terminal of the transistor switching circuit is connected to the positive output terminal of the optocoupler isolation circuit, the input terminal of the transistor switching circuit is connected to the input terminal of the RC voltage regulator circuit and the output terminal of the power input circuit, and the output terminal of the transistor switching circuit is grounded.

4. The interlocking control circuit for a high-voltage live display as described in claim 3, characterized in that: The input terminal of the transistor switching circuit is connected to the output terminal of the power input circuit through a protection circuit.

5. The interlocking control circuit for a high-voltage live display as described in claim 4, characterized in that: The protection circuit includes a resistor R4, with the first end of the resistor R4 connected to the output terminal of the power input circuit and the second end of the resistor R4 connected to the input terminal of the transistor switching circuit.

6. The interlocking control circuit for a high-voltage live display as described in claim 3, characterized in that: The transistor switching circuit includes a transistor Q2 and a resistor R7. The first end of the resistor R7 and the emitter of the transistor Q2 are connected to the input terminal of the transistor switching circuit. The second end of the resistor R7 and the base of the transistor Q2 are connected to the control terminal of the transistor switching circuit. The collector of the transistor Q2 is connected to the output terminal of the transistor switching circuit.

7. The interlocking control circuit for a high-voltage live display as described in claim 1, characterized in that: The first input terminal of the rectifier circuit and the input terminal of the switching transistor circuit are connected to the output terminal of the power input circuit through a latching indicator circuit.

8. The interlocking control circuit for a high-voltage live display as described in claim 7, characterized in that: The lockout indicator circuit includes resistor R2, resistor R3, diode D2, and indicator LED1; the first end of resistor R3 is connected to the output terminal of the power input circuit, the second end of resistor R3 is connected to the first end of resistor R2 and the positive terminal of diode D2, the negative terminal of diode D2 is connected to the first input terminal of the rectifier circuit and the input terminal of the switching transistor circuit, the second end of resistor R2 is connected to the positive terminal of indicator LED1, and the negative terminal of indicator LED1 is connected to the second ground.

9. The interlocking control circuit for a high-voltage live display as described in claim 5, characterized in that: The power input circuit includes a diode D1, a resistor R1, and a capacitor C1. The positive terminal of the diode D1 is connected to the input terminal of the power input circuit, the negative terminal of the diode D1 is connected to the first terminal of the resistor R1, the second terminal of the resistor R1 and the first terminal of the capacitor C1 are connected to the output terminal of the power input circuit, and the second terminal of the capacitor C1 is connected to the second ground.

10. The interlocking control circuit for a high-voltage live display as described in claim 1, characterized in that: The switching circuit includes a MOSFET Q1, with the drain, source, and gate of Q1 connected to the input, output, and control terminals of the switching circuit, respectively. The rectifier circuit includes a rectifier bridge BD1. The RC regulator circuit includes a capacitor C2 and a resistor R5, with the first terminals of resistor R5 and capacitor C2 connected to the input terminal of the RC regulator circuit, the second terminal of capacitor C2 connected to a second ground, and the second terminal of resistor R5 connected to the output terminal of the RC regulator circuit.

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