Machine shell leakage protection circuit and road traffic signal control machine using protection circuit

A technology for protecting circuits and casing leakage, which is applied in the direction of controlling traffic signals, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., to achieve the effect of improving the safety factor

Inactive Publication Date: 2013-06-05
上海新中新猎豹交通科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing road traffic signal controllers only use the leakage protector to realize the leakage protection, which cannot provide leakage protection when the casing is not effectively grounded, the present invention designs a casing leakage protection Circuit and road traffic signal controller using the circuit

Method used

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  • Machine shell leakage protection circuit and road traffic signal control machine using protection circuit
  • Machine shell leakage protection circuit and road traffic signal control machine using protection circuit
  • Machine shell leakage protection circuit and road traffic signal control machine using protection circuit

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specific Embodiment approach 1

[0014] Specific implementation mode one, see figure 1 This embodiment will be described. The casing leakage protection circuit described in this embodiment includes a casing leakage detection circuit 1, a driving and protection circuit 2, a leakage current detection circuit 3 and an internal power supply circuit 4 of the signal machine;

[0015] The casing leakage detection circuit 1 has a casing connection terminal, the zero line terminal of the casing leakage detection circuit 1 is connected to the zero line output terminal N-out1 of the drive and protection circuit 2, and the detection signal of the casing leakage detection circuit 1 The output terminal is connected to the control signal input terminal of the drive and protection circuit 2, the drive and protection circuit 2 has a neutral line input terminal and a live line input terminal for external power supply, and the neutral line output terminal N-out1 of the drive and protection circuit 2 is connected to the leakage ...

specific Embodiment approach 2

[0018] Specific implementation mode two, see figure 2 This embodiment will be described. This embodiment is a further limitation on the structure of the casing leakage detection circuit 1 in the casing leakage protection circuit described in the first specific embodiment. In this embodiment, the casing leakage detection circuit 1 is composed of an integrated circuit U2, a resistor R8- 12. Composed of capacitor C5-8, second triode Q2 and transformer L2, the model of the integrated circuit U2 is M54123, one end of the resistor R12 is connected to the connection end of the casing, and the other end of the resistor R12 is connected to the drive and protection The neutral line output terminal N-out1 of the circuit 2 is connected, the transformer L2 is used to detect the current signal flowing through the resistor R12, and one end of the induction coil of the transformer L2 is connected to the VR terminal of the integrated circuit U2 and one end of the resistor R8 at the same time,...

specific Embodiment approach 3

[0020] Specific implementation mode three, see image 3 This embodiment will be described. This embodiment is a further limitation of the leakage current detection circuit 3 described in Embodiment 1. In this embodiment, the leakage current detection circuit 3 is composed of a zero-sequence transformer L1, an integrated circuit U1, resistors R1, R5, and R6 , R7, capacitor C1-4 and the first triode Q1, the zero sequence transformer L1 is used to detect the leakage current between the neutral line and the live wire of the equipment power supply, and one end of the induction coil of the zero sequence transformer L1 is simultaneously Connect one end of the resistor R1 to the VR end of the integrated circuit U1, the other end of the induction coil of the zero-sequence transformer L1 is connected to the other end of the resistor R1 and one end of the resistor R5 at the same time, and the other end of the resistor R5 is connected to the IN of the integrated circuit U1 The VS end of ...

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Abstract

The invention provides a machine shell leakage protection circuit and a road traffic signal control machine using the protection circuit, and relates to the technical field of leakage protection and traffic equipment. When a machine shell does not effectively ground, an existing traffic signal control machine fails to play a role of leakage protection due to the fact that only a leakage protector is adopted to realize leakage protection. The above problem is solved. The machine shell leakage protection circuit detects leakage current between the machine shell and live wires through a machine shell leakage detection circuit to judge whether the machine shell is charged or not, and sends control signals to a drive and protection circuit. The machine shell leakage protection circuit further detects whether a whole machine power supply is discharged or not through the machine shell leakage detection circuit and sends control signals to the drive and protection circuit, and the drive and protection circuit starts power-off protection. The power supply of a control circuit of the road traffic signal control machine and power supply of signal lamps are controlled and protected separately through inner power supply circuits of the road traffic signal control machine. The machine shell leakage protection circuit and the road traffic signal control machine using the protection circuit can effectively play the role of protecting the machine shell which is charged in the condition that an equipment machine shell is not grounded, and are suitable for leakage protection of the road traffic signal control machine.

Description

technical field [0001] The invention relates to the technical field of leakage protection, in particular to the leakage protection technology of a road traffic signal controller. Background technique [0002] At present, in the leakage detection and risk elimination of road traffic signal control machines (hereinafter referred to as signal machines) in my country, it is basically simple to use incoming line leakage protectors. However, due to the quality problems of on-site construction, the chassis is not well grounded or not connected to the ground at all, which leads to the existence of potential safety hazards. When the casing is not effectively grounded, and the live wire of the power supply leaks to the casing or overlaps with the casing, the leakage protector will not work. Only when the human body or animal touches the casing and gets an electric shock can it trip for protection, and this At that time, personal safety has been endangered. Contents of the invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/32H02H9/06G08G1/07G01R19/00
Inventor 姜永强王厚强许占胜陶锐马成友刘尊时张振吴大朋牟海娜
Owner 上海新中新猎豹交通科技股份有限公司
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