Passive non-contact high-voltage live display circuit

Abstract

The utility model discloses a passive non-contact high-voltage live display circuit. The passive non-contact high-voltage live display circuit comprises an induction electrode, a rectifier bridge D, an energy storage capacitor C1, a current-limiting resistor R, a switching tube D1 and a light emitting diode D2, the current-limiting resistor R, the switching tube D1 and the light-emitting diode D2 are connected in series and then are connected in parallel to two ends of the energy-storage capacitor C1; the output end of the rectifier bridge D is connected in parallel to two ends of the energy-storage capacitor C1; the induction electrode is connected with one input end of the rectifier bridge D. The other input end of the rectifier bridge D is connected with the ground. According to the utility model, an innovative passive non-contact high-voltage live display circuit is created, and non-contact detection is realized through the space distribution capacitance between the induction electrode and the high-voltage busbar. The passive non-contact high-voltage live display circuit has the advantages of simple structure, no need of direct contact with a high-voltage busbar, simple and convenient installation, safety and reliability, and realizes detection and display of high-voltage live information through space distribution capacitors.

Description

Technical Field

[0001] The utility model discloses a passive non-contact high-voltage live display circuit, belonging to the technical field of power safety monitoring. Background Art

[0002] Traditional high-voltage power equipment live indicators typically use capacitive sensors, which use the principle of capacitive voltage division to determine whether the high-voltage equipment is live. However, this method requires installing a capacitive sensor in parallel with the high-voltage incoming busbar, which not only takes up installation space but also poses the risk of capacitor breakdown. Utility Model Content

[0003] The purpose of the utility model is to provide a passive non-contact high-voltage live display circuit, which utilizes a sensing electrode with an insulated surface and a metal sheet inside installed in a circular structure at the low-voltage end. When in use, the sensing electrode is close to the high-voltage busbar and does not make electrical contact with the high-voltage busbar. There is a capacitor C0 between the sensing electrode and the high-voltage busbar, and a stray capacitor C2 between the sensing electrode and the earth. In this way, a spatially distributed capacitor with a series structure is naturally formed between C0 and C2. In the absence of electrical contact, the high-voltage busbar voltage can be divided and sent to the passive non-contact high-voltage live display circuit. Then, a rectifier circuit, an energy storage circuit and a switch circuit are used to realize the live display function of the high-voltage live equipment.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A passive non-contact high-voltage live display circuit includes a sensing electrode, a rectifier bridge D, an energy storage capacitor C1, a current limiting resistor R, a switch tube D1, and a light-emitting diode D2; the current limiting resistor R, the switch tube D1, and the light-emitting diode D2 are connected in series and then in parallel across the energy storage capacitor C1, and the output end of the rectifier bridge D is connected in parallel across the energy storage capacitor C1; the sensing electrode is connected to one input end of the rectifier bridge D, and the other input end of the rectifier bridge D is connected to the ground.

[0006] Preferably, the above-mentioned sensing electrode adopts a circular structure with an insulated surface and a metal sheet inside. When in use, the sensing electrode is close to the high-voltage busbar and has no electrical contact with the high-voltage busbar. There is a capacitance C0 between the sensing electrode and the high-voltage busbar, and a stray capacitance C2 between the sensing electrode and the earth. In this way, a spatially distributed capacitance with a series structure is naturally formed between C0 and C2. In the absence of electrical contact, the high-voltage busbar voltage can be divided to obtain the charged information of the high-voltage equipment.

[0007] Preferably, the rectifier bridge D is a full-bridge rectifier circuit composed of four diodes.

[0008] Preferably, the energy storage capacitor C1 is a polyester capacitor with a capacitance of 1-100 microfarads. The capacitance is determined according to the flickering frequency. The larger the capacitance C1 is, the longer the energy storage time is and the slower the flickering frequency is.

[0009] Preferably, the switch tube D1 is a DB3 bidirectional switch tube.

[0010] Preferably, the current-limiting resistor R is a 1W power resistor with a resistance value of 60-120 ohms, which controls the brightness of the light-emitting tube. The greater the brightness, the smaller the current-limiting resistor.

[0011] Preferably, the light emitting diode D2 is a high-brightness red light emitting tube.

[0012] The beneficial effects of the utility model are:

[0013] 1. A circular sensing electrode with an insulated surface and a metal sheet inside is installed at the low-voltage end. When in use, the sensing electrode is close to the high-voltage busbar but not in electrical contact with it. There is a capacitance C0 between the sensing electrode and the high-voltage busbar, and a stray capacitance C2 between the sensing electrode and the earth. In this way, a spatially distributed capacitance with a series structure is naturally formed between C0 and C2. In the absence of electrical contact, the high-voltage busbar voltage can be divided to obtain the charged information of the high-voltage equipment.

[0014] 2. A spatial distributed capacitor with a series structure naturally formed between C0 and C2 constitutes an AC voltage source with a high internal resistance. Since the internal resistance of the AC voltage source is very large, it cannot directly provide working power to the indicator light. It is proposed to use a rectifier circuit to convert the AC voltage into a DC voltage to charge the energy storage circuit and the energy storage capacitor to provide working power for the indicator light. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a circuit diagram of the present utility model. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention. Example

[0017] like Figure 1 As shown, a passive non-contact high-voltage live display circuit includes a sensing electrode, a rectifier bridge D, an energy storage capacitor C1, a current limiting resistor R, a switch tube D1 and a light-emitting diode D2; the current limiting resistor R, the switch tube D1 and the light-emitting diode D2 are connected in series and then in parallel across the energy storage capacitor C1, and the output end of the rectifier bridge D is connected in parallel across the energy storage capacitor C1; the sensing electrode is connected to one input end of the rectifier bridge D, and the other input end of the rectifier bridge D is connected to the ground.

[0018] Preferably, the above-mentioned sensing electrode adopts a circular structure with an insulated surface and a metal sheet inside. When in use, the sensing electrode is close to the high-voltage busbar and has no electrical contact with the high-voltage busbar. There is a capacitance C0 between the sensing electrode and the high-voltage busbar, and a stray capacitance C2 between the sensing electrode and the earth. In this way, a spatially distributed capacitance with a series structure is naturally formed between C0 and C2. In the absence of electrical contact, the high-voltage busbar voltage can be divided to obtain the charged information of the high-voltage equipment.

[0019] Preferably, the rectifier bridge D is a full-bridge rectifier circuit composed of four diodes.

[0020] Preferably, the energy storage capacitor C1 is a polyester capacitor with a capacitance of 1-100 microfarads. The capacitance is determined according to the flickering frequency. The larger the capacitance C1 is, the longer the energy storage time is and the slower the flickering frequency is.

[0021] Preferably, the switch tube D1 is a DB3 bidirectional switch tube.

[0022] Preferably, the current-limiting resistor R is a 1W power resistor with a resistance value of 60-120 ohms, which controls the brightness of the light-emitting tube. The greater the brightness, the smaller the current-limiting resistor.

[0023] Preferably, the light emitting diode D2 is a high-brightness red light emitting tube.

[0024] When the sensing electrode is close to a 10kV high-voltage device, there is a capacitor C0 between the electrode and the high-voltage charged body, and a capacitor C2 between the electrode and the earth. The voltage of the high-voltage charged body is U=10kV / 1.732, then the voltage across C2, that is, the voltage U2 between the electrode and the earth, is: U2=U / (1+C2 / C0). The electrode obtains a higher voltage with a larger internal resistance, which is rectified by a rectifier bridge to charge the energy storage capacitor C1. When the charging voltage of the energy storage capacitor C1 reaches the DB3 turn-on voltage, the DB3 switch tube is turned on, and the energy storage capacitor C1 supplies power to the light-emitting diode through the current limiting circuit, and the light-emitting diode lights up. When the energy of the energy storage capacitor C1 is exhausted, DB3 is turned off, the light-emitting diode goes out, and the energy storage capacitor C1 starts charging again. This process repeats and the light-emitting diode flashes, indicating that the high-voltage device is charged.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A passive non-contact high-voltage live display circuit, characterized in that: It includes an induction electrode, a rectifier bridge D, an energy storage capacitor C1, a current limiting resistor R, a switch tube D1 and a light-emitting diode D2; the current limiting resistor R, the switch tube D1 and the light-emitting diode D2 are connected in series and then in parallel at both ends of the energy storage capacitor C1, and the output end of the rectifier bridge D is connected in parallel at both ends of the energy storage capacitor C1; the induction electrode is connected to one input end of the rectifier bridge D, and the other input end of the rectifier bridge D is connected to the ground.

2. A passive non-contact high-voltage live display circuit according to claim 1, characterized in that: The sensing electrode adopts a circular structure with an insulated surface and a metal sheet inside. When in use, the sensing electrode is close to the high-voltage busbar without electrical contact with the high-voltage busbar. There is a capacitance C0 between the sensing electrode and the high-voltage busbar, and a stray capacitance C2 between the sensing electrode and the ground. In this way, a spatially distributed capacitance with a series structure is naturally formed between C0 and C2. In the absence of electrical contact, the high-voltage busbar voltage can be divided to obtain the charged information of the high-voltage equipment.

3. The passive non-contact high-voltage live display circuit according to claim 1, characterized in that: The rectifier bridge D is a full-bridge rectifier circuit composed of four diodes.

4. The passive non-contact high-voltage live display circuit according to claim 1, characterized in that: The energy storage capacitor C1 is a polyester capacitor with a capacitance of 1-100 microfarads. The capacitance is determined according to the flickering frequency. The larger the capacitance C1 is, the longer the energy storage time is and the slower the flickering frequency is.

5. The passive non-contact high-voltage live display circuit according to claim 1, characterized in that: The switch tube D1 is a DB3 bidirectional switch tube.

6. The passive non-contact high-voltage live display circuit according to claim 1, characterized in that: The current limiting resistor R is a 1W power resistor with a resistance value of 60-120 ohms, which controls the brightness of the light-emitting tube. The greater the brightness, the smaller the current limiting resistor.

7. The passive non-contact high-voltage live display circuit according to claim 1, characterized in that: The light emitting diode D2 is a high-brightness red light emitting tube.

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