A signal lamp fault detection circuit with voltage and current detection function and its detection control method

A voltage and current detection and fault detection circuit technology is applied in the field of traffic lights to achieve the effect of improving the reliability of use and accurate and reliable fault detection.

CN105355069BActive Publication Date: 2018-04-17ANHUI KELI INFORMATION IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-04-17

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Abstract

The invention relates to a signal lamp fault detection circuit with a function of voltage and current detection, and a detection control method therefor. Compared with the prior art, the invention irons out a defect that the circuit-break and short-circuit detection of a traffic lamp cannot be carried out. The circuit comprises a signal lamp, and the signal lamp is connected to an output end of an annunciator silicon controlled rectifier. The circuit also comprises a current detection circuit and a voltage detection circuit, and the voltage detection circuit is in parallel connection with the signal lamp. The current detection circuit is in series connection with a circuit loop where the signal lamp and the output end of the annunciator silicon controlled rectifier are located. The circuit can achieve voltage detection and current detection at the same time, can carry out the fault detection of the signal lamp in real time, improves the use reliability of the signal lamp, and achieves a purpose of accurate and reliable fault detection.
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Description

technical field

[0001] The invention relates to the technical field of traffic signal lamps, in particular to a signal lamp failure detection circuit with voltage and current detection functions and a detection and control method thereof. Background technique

[0002] In addition to being able to control the signal light according to the preset phase, the intelligent signal machine also needs to be able to accurately detect the failure of the signal light. There are two common faults of signal lamps: open circuit and short circuit, and the corresponding fault detection methods also include current detection and voltage detection. The voltage detection can detect the short circuit fault of the signal lamp, but cannot detect the open circuit of the signal lamp; the current detection can detect the open circuit fault of the signal lamp, but cannot detect the short circuit of the signal lamp. Therefore, how to perform both voltage detection and current detection for signal lamp...

Examples

Embodiment Construction

[0027] In order to have a further understanding and understanding of the structural features of the present invention and the achieved effects, the preferred embodiments and accompanying drawings are used for a detailed description, as follows:

[0028] like figure 1 As shown, a signal lamp failure detection circuit with a voltage and current detection function according to the present invention includes a signal lamp 1, which is connected to the output terminal 2 of the thyristor of the signal machine, and a fuse 6 is also connected to the signal lamp 1. The thyristor output terminal 2 is the control output terminal of the traffic signal machine, which provides power output control for the signal lamp 1 . Signal lamp 1 is a red signal lamp, a green signal lamp or a yellow signal lamp, that is, in practical applications, to monitor a group of red and green signal lamps, it is necessary to install current detection circuits on the three signal lamps (red signal lamp, green sign...