A traffic signal light fault detection power supply

Abstract

The utility model relates to the technical field of traffic lights, and in particular to a traffic light fault detection power supply, wherein the output end of the EMC circuit is electrically connected to the input end of the active PFC circuit, the output end of the active PFC circuit is electrically connected to the input end of the isolation conversion circuit, the output end of the isolation conversion circuit is electrically connected to the input end of the output rectifier filter circuit, the output end of the output rectifier filter circuit is electrically connected to the input end of the constant current and constant voltage circuit, the output end of the constant current and constant voltage circuit is electrically connected to the input end of the isolation conversion circuit, the output end of the MCU control circuit is electrically connected to the input end of the isolation conversion circuit, and the output end of the input detection circuit is electrically connected to the input end of the MCU control circuit. The utility model realizes the soft start of the traffic light during fast switching, and can avoid output voltage and current overshoot during constant current and constant voltage, thereby ensuring that the traffic light or load circuit is not impacted by current and overvoltage.

Description

Technical Field

[0001] The utility model relates to the technical field of traffic signal lamps, in particular to a traffic signal lamp fault detection power supply. Background Art

[0002] At present, the traffic light fault detection power supply on the market uses ordinary traffic light power supply. Ordinary traffic light power supply does not have voltage and current overshoot protection at the output end, which can easily damage the power supply system of the fault detection board, thereby affecting the fault detection board's detection of the status of the traffic light display board, and then causing the traffic light display board to be unable to detect faults and report them to the operation and maintenance platform under fault conditions such as black lights, missing strokes in the countdown, etc., and unable to start emergency repairs in time, causing congestion at intersections and even posing hidden dangers to traffic safety accidents. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a traffic light fault detection power supply, so as to solve the problem that the power supply of the current traffic light fault detection system causes damage to the fault detection board, and improve the reliability and stability of the traffic light fault detection system.

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

[0005] A traffic light fault detection power supply is designed, comprising an EMC circuit, an active PFC circuit, an isolation conversion circuit, an output rectifier filter circuit, a constant current and constant voltage circuit, an MCU control circuit, and an input detection circuit, wherein the output end of the EMC circuit is electrically connected to the input end of the active PFC circuit, the output end of the active PFC circuit is electrically connected to the input end of the isolation conversion circuit, the output end of the isolation conversion circuit is electrically connected to the input end of the output rectifier filter circuit, the output end of the output rectifier filter circuit is electrically connected to the input end of the constant current and constant voltage circuit, the output end of the constant current and constant voltage circuit is electrically connected to the input end of the isolation conversion circuit, the output end of the MCU control circuit is electrically connected to the input end of the isolation conversion circuit, the output end of the input detection circuit is electrically connected to the input end of the MCU control circuit, and the input end of the input detection circuit is electrically connected to the input end of the active PFC circuit.

[0006] Preferably, the output end of the output rectifier and filter circuit is connected to a signal light fault detection board, and the signal light fault detection board is electrically connected to a signal light display board and a countdown control board.

[0007] The utility model proposes a traffic light fault detection power supply, which has the beneficial effect that: the utility model realizes the soft start of the signal light when it is switched on and off quickly, and can avoid output voltage and current overshoot at constant current and constant voltage, ensuring that the signal light or load circuit is not impacted by current and overvoltage. It fully considers the characteristics and needs of on-site traffic lights and the demands of customers, and comprehensively solves the hidden dangers of damage to the signal light fault detection board caused by the signal light power supply in the current traffic light fault detection system.

[0008] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 This is a schematic diagram of the power supply structure for traffic light fault detection;

[0011] Figure 2 This is a structural diagram of the traffic light fault detection system.

[0012] In the figure: EMC circuit 1, active PFC circuit 2, isolation conversion circuit 3, output rectification and filtering circuit 4, constant current and constant voltage circuit 5, MCU control circuit 6, input detection circuit 7. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] Reference Figure 1-2A traffic light fault detection power supply includes an EMC circuit 1, an active PFC circuit 2, an isolation conversion circuit 3, an output rectifier filter circuit 4, a constant current and constant voltage circuit 5, an MCU control circuit 6, and an input detection circuit 7. The MCU control circuit 6 controls the fast switching of the traffic light. The output end of the EMC circuit 1 is electrically connected to the input end of the active PFC circuit 2, the output end of the active PFC circuit 2 is electrically connected to the input end of the isolation conversion circuit 3, the output end of the isolation conversion circuit 3 is electrically connected to the input end of the output rectifier filter circuit 4, the output end of the output rectifier filter circuit 4 is electrically connected to the input end of the constant current and constant voltage circuit 5, and the constant current and constant voltage circuit 5 is electrically connected to the input end of the output rectifier filter circuit 4. The output end of the voltage circuit 5 is electrically connected to the input end of the isolation conversion circuit 3, the output end of the MCU control circuit 6 is electrically connected to the input end of the isolation conversion circuit 3, the output end of the input detection circuit 7 is electrically connected to the input end of the MCU control circuit 6, and the input end of the input detection circuit 7 is electrically connected to the input end of the active PFC circuit 2. During the rapid switching of the signal light, the MCU control circuit 6 is used to control the change of the output voltage to realize the switching of the signal light. This control scheme avoids the problem of output voltage overshoot, especially when some signal lights require constant current control. Conventional control methods are prone to current overshoot when the signal light is switched. This control method is equivalent to realizing the soft start of the signal light during rapid switching, and can avoid output voltage and current overshoot when constant current and constant voltage are used, ensuring that the signal light or load circuit is not impacted by current and overvoltage.

[0015] The output end of the output rectifier and filter circuit 4 is connected to a signal light fault detection board, which is electrically connected to a signal light display board and a countdown control board. The signal light fault detection board detects the status of the signal light display board, such as black light, dim light, and missing strokes in the countdown. The signal light fault detection power supply provides power supply for the signal light fault detection board and the countdown control board.

[0016] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0017] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A traffic light fault detection power supply, comprising an EMC circuit (1), an active PFC circuit (2), an isolation conversion circuit (3), an output rectification and filtering circuit (4), a constant current and constant voltage circuit (5), an MCU control circuit (6), and an input detection circuit (7), characterized in that: The output end of the EMC circuit (1) is electrically connected to the input end of the active PFC circuit (2), the output end of the active PFC circuit (2) is electrically connected to the input end of the isolation conversion circuit (3), the output end of the isolation conversion circuit (3) is electrically connected to the input end of the output rectification and filtering circuit (4), the output end of the output rectification and filtering circuit (4) is electrically connected to the input end of the constant current and constant voltage circuit (5), the output end of the constant current and constant voltage circuit (5) is electrically connected to the input end of the isolation conversion circuit (3), the output end of the MCU control circuit (6) is electrically connected to the input end of the isolation conversion circuit (3), the output end of the input detection circuit (7) is electrically connected to the input end of the MCU control circuit (6), and the input end of the input detection circuit (7) is electrically connected to the input end of the active PFC circuit (2).

2. A traffic light fault detection power supply according to claim 1, characterized in that: The output end of the output rectifying and filtering circuit (4) is connected to a signal light fault detection board, and the signal light fault detection board is electrically connected to a signal light display board and a countdown control board.

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