Monitoring circuit for highway monitoring power supply

Abstract

The utility model discloses a monitoring circuit for an expressway monitoring power supply, which comprises a battery management system BMS, the battery management system BMS comprises a main control chip MCU, a pin 1 of the main control chip MCU is electrically connected with a rectification unit AFE, a pin 3 of the main control chip MCU is electrically connected with a pin 1 of an IC chip, a pin 2 of the IC chip is electrically connected with a pin 1 of a patch triode G2, and a pin 3 of the patch triode G2 is electrically connected with a pin 3 of the chip AFE. And a pin 3 of the IC chip is electrically connected with a pin 1 of a patch triode C3. According to the utility model, through the arrangement of the voltage stabilizing circuit, the purpose of stable power supply of the 220V commercial power supply end can be realized, and through the cooperation of the charger and the switch S1, when the 220V commercial power supply end is powered off, the charger can automatically and continuously supply power to the camera and the transmission device, thereby ensuring that the highway monitoring video is always in an on-line state, and improving the monitoring efficiency. And the normal online of the video during the power-off maintenance period of the 220V commercial power supply end is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of monitoring circuits, in particular to a monitoring circuit for monitoring power supplies for expressways. Background Art

[0002] At present, almost all highway monitoring cameras are powered by tower power. Due to the unstable power supply of tower power, when the power supply is cut off, the camera will not work, which will easily lead to the phenomenon of highway trunk monitoring video disconnection, causing certain inconvenience to highway traffic police, road administration, and highway monitoring center, and cannot meet the use needs. Based on the above situation, we propose a monitoring circuit for highway monitoring power supply. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and proposes a monitoring circuit for monitoring power supply of a highway.

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

[0005] A monitoring circuit for a highway monitoring power supply comprises a battery management system BMS, wherein the battery management system BMS comprises a main control chip MCU, wherein pin 1 of the main control chip MCU is electrically connected to a rectifier unit AFE, pin 3 of the main control chip MCU is electrically connected to pin 1 of an IC chip, pin 2 of the IC chip is electrically connected to pin 1 of a patch transistor G2, pin 3 of the IC chip is electrically connected to pin 1 of a patch transistor C3, pin 3 of the patch transistor G2 is electrically connected to pin 2 of the patch transistor G3, pin 1 of the patch transistor G2 is electrically connected to one end of a resistor R1, and the other end of the resistor R1 is electrically connected to pin 1 of the patch transistor G1;

[0006] Pin 11 of the main control chip MCU is electrically connected to a read-only memory E2PROM, pin 10 of the main control chip MCU is electrically connected to a camera and a transmission device, power input terminals of the camera and the transmission device are electrically connected to a 220V mains power supply terminal, and the power input terminals of the camera and the transmission device are also electrically connected to a voltage stabilizing circuit, the voltage stabilizing circuit is electrically connected to the 220V mains power supply terminal, and the voltage stabilizing circuit is electrically connected to pin 12 of the main control chip MCU;

[0007] Pins 7, 8 and 9 of the main control chip MCU are electrically connected to one end of the same RS485 communication interface, and the other end of the RS485 communication interface is electrically connected to the host computer U1. Pin 5 of the main control chip MCU is electrically connected to one end of the charger and one end of the load. The other end of the charger is electrically connected to pin 3 of the patch transistor G3, and the other end of the load is electrically connected to pin 3 of the patch transistor G2 and pin 2 of the patch transistor G3. One end of the charger is also electrically connected to one end of the switch S1, and the other end of the switch S1 is electrically connected to the voltage stabilizing circuit. One end of the switch S1 is electrically connected to pin 5 of the main control chip MCU, and pin 3 of the patch transistor G1 is electrically connected to one end of the fuse F1. The other end of the fuse F1 is electrically connected to one end of the fuse F2, and the other end of the fuse F2 is electrically connected to one end of the charger and the load.

[0008] Preferably, the voltage stabilizing circuit includes a three-stage voltage stabilizing tube VR, a pin 3 of the three-stage voltage stabilizing tube VR is electrically connected to one end of a resistor R2, one end of a capacitor C1 and a base of a transistor Q1, the other end of the resistor R2 and the collector of the transistor Q1 are both electrically connected to the 220V mains power supply end, the other end of the capacitor C1 is electrically connected to a pin 1 of the three-stage voltage stabilizing tube VR, the pin 1 of the three-stage voltage stabilizing tube VR is also electrically connected to one end of a resistor R3 and one end of a resistor R4, the emitter of the transistor Q1 is electrically connected to the other end of the resistor R3, the emitter of the transistor Q1 is electrically connected to one end of a resistor R5, the other end of the resistor R5 is electrically connected to one end of a capacitor C2, the other end of the capacitor C2 is electrically connected to one end of a resistor R6, the other end of the resistor R6, the other end of the resistor R4 and the pin 2 of the three-stage voltage stabilizing tube VR are all grounded, and the emitter of the transistor Q1 is electrically connected to the power supply input end of the camera and the transmission equipment.

[0009] Preferably, the other end of the resistor R2 and the collector of the transistor Q1 are both electrically connected to the pin 12 and the pin 5 of the main control chip MCU.

[0010] Preferably, the charger has a trickle shut-off function at the end of the charging current.

[0011] Preferably, the host computer U1 communicates with the main control chip MCU through UART1 interface, UART2 interface and UART3 interface, and the host computer U1 is used to display battery voltage, current, temperature, status, SOC, SOH and battery production information.

[0012] Preferably, the rectifier unit AFE can be used to eliminate high-order harmonics in the circuit, improve the power factor, and is not affected by power grid fluctuations.

[0013] Preferably, the voltage stabilizing circuit is used to adjust the voltage in the circuit, and the read-only memory E2PROM is used to read the current and voltage in the circuit.

[0014] Compared with the existing technology, the beneficial effects of the utility model are:

[0015] 1. Through the setting of the voltage stabilizing circuit, the voltage can be adjusted when the voltage is high, so as to achieve the purpose of stable power supply at the 220V mains power supply end;

[0016] 2. Through the coordination of the charger, switch S1 and the main control chip MCU, when the 220V mains power supply is cut off, the switch S1 can be automatically controlled to open, so that the charger can be connected to the camera and the transmission equipment through the voltage stabilizing circuit, and the charger can automatically supply power to the camera and the transmission equipment continuously, so as to ensure that the highway monitoring video is always online and the video is normally online during the power outage maintenance of the 220V mains power supply;

[0017] The utility model can achieve the purpose of stable power supply at the 220V mains power supply end through the setting of the voltage stabilizing circuit, and through the cooperation of the charger and the switch S1, when the 220V mains power supply end is powered off, the charger can automatically supply continuous power to the camera and the transmission equipment, thereby ensuring that the highway monitoring video is always online and that the video is normally online during the power outage maintenance of the 220V mains power supply end. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A circuit diagram of a monitoring circuit for a highway monitoring power supply proposed by the utility model;

[0019] Figure 2 The utility model discloses a circuit diagram of a voltage stabilizing circuit in a monitoring circuit for a highway monitoring power supply. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Reference Figure 1-2, a monitoring circuit for highway monitoring power supply, including a battery management system BMS, the battery management system BMS includes a main control chip MCU, pin 1 of the main control chip MCU is electrically connected to a rectifier unit AFE, wherein the rectifier unit AFE can be used to eliminate high-order harmonics in the circuit, improve the power factor, and is not affected by power grid fluctuations, pin 3 of the main control chip MCU is electrically connected to pin 1 of an IC chip, pin 2 of the IC chip is electrically connected to pin 1 of a patch transistor G2, pin 3 of the IC chip is electrically connected to pin 1 of a patch transistor C3, pin 3 of the patch transistor G2 is electrically connected to pin 2 of the patch transistor G3, pin 1 of the patch transistor G2 is electrically connected to one end of a resistor R1, and the other end of the resistor R1 is electrically connected to pin 1 of the patch transistor G1;

[0022] Pin 11 of the main control chip MCU is electrically connected to a read-only memory E2PROM, which is used to read the current and voltage in the circuit. Pin 10 of the main control chip MCU is electrically connected to a camera and a transmission device. The power input terminals of the camera and the transmission device are electrically connected to the same 220V mains power supply terminal. The power input terminals of the camera and the transmission device are also electrically connected to the same voltage stabilizing circuit, wherein the voltage stabilizing circuit is used to adjust the voltage in the circuit, the voltage stabilizing circuit is electrically connected to the 220V mains power supply terminal, and the voltage stabilizing circuit is electrically connected to pin 12 of the main control chip MCU;

[0023] Pins 7, 8 and 9 of the main control chip MCU are electrically connected to one end of the same RS485 communication interface, and the other end of the RS485 communication interface is electrically connected to the host computer U1, wherein the host computer U1 communicates with the main control chip MCU through the UART1 interface, the UART2 interface and the UART3 interface, and the host computer U1 is used to display the battery voltage, current, temperature, status, SOC, SOH and battery production information, etc.;

[0024] Pin 5 of the main control chip MCU is electrically connected to one end of the charger and one end of the load, the other end of the charger is electrically connected to pin 3 of the patch transistor G3, the other end of the load is electrically connected to pin 3 of the patch transistor G2 and pin 2 of the patch transistor G3, one end of the charger is also electrically connected to one end of the switch S1, the other end of the switch S1 is electrically connected to the voltage stabilizing circuit, one end of the switch S1 is electrically connected to pin 5 of the main control chip MCU, pin 3 of the patch transistor G1 is electrically connected to one end of the fuse F1, the other end of the fuse F1 is electrically connected to one end of the fuse F2, the other end of the fuse F2 is electrically connected to one end of the charger and the load, wherein the charger has a trickle shutdown function at the end of the charging current;

[0025] The voltage stabilizing circuit includes a three-stage voltage stabilizing tube VR, a pin 3 of the three-stage voltage stabilizing tube VR is electrically connected to one end of a resistor R2, one end of a capacitor C1 and a base of a transistor Q1, the other end of the resistor R2 and the collector of the transistor Q1 are both electrically connected to a 220V mains power supply terminal, the other end of the capacitor C1 is electrically connected to a pin 1 of the three-stage voltage stabilizing tube VR, the pin 1 of the three-stage voltage stabilizing tube VR is also electrically connected to one end of a resistor R3 and one end of a resistor R4, the emitter of the transistor Q1 is electrically connected to the other end of the resistor R3, the emitter of the transistor Q1 is electrically connected to one end of a resistor R5, the other end of the resistor R5 is electrically connected to one end of a capacitor C2, the other end of the capacitor C2 is electrically connected to one end of a resistor R6, The other end of the resistor R6, the other end of the resistor R4 and the pin 2 of the three-stage voltage regulator VR are all grounded, the emitter of the transistor Q1 is electrically connected to the power supply input terminal of the camera and the transmission equipment, wherein the other end of the resistor R2 and the collector of the transistor Q1 are electrically connected to the pin 12 and the pin 5 of the main control chip MCU; the utility model can achieve the purpose of stable power supply at the 220V mains power supply end through the setting of the voltage stabilizing circuit, and through the cooperation of the charger and the switch S1, when the 220V mains power supply end is powered off, the charger can automatically supply continuous power to the camera and the transmission equipment, thereby ensuring that the highway monitoring video is always online and that the video is normally online during the power outage maintenance of the 220V mains power supply end.

[0026] Working principle: The current and voltage conditions in the circuit can be read through the read-only memory E2PROM, and the voltage conditions of the 220V mains power supply end can be monitored with the camera and transmission equipment, and transmitted to the main control chip MCU. The main control chip MCU communicates with the host computer U1 through the UART1 interface, UART2 interface and UART3 interface, and transmits the information in the read current to the host computer U1 for display, so that personnel can intuitively monitor the circuit conditions;

[0027] At the same time, the 220V mains power supply provides power for the camera and transmission equipment. When it is detected that the voltage is high, the voltage can be adjusted through the voltage stabilizing circuit to achieve the purpose of voltage stabilization. The regulated voltage provides stable power to the camera and transmission equipment. When it is detected that the 220V mains power supply is powered off, the main control chip MCU controls the switch S1 to turn on, so as to achieve the connection between the charger and the main control chip MCU and the voltage stabilizing circuit. The voltage and current of the charger are input into the voltage stabilizing circuit for voltage stabilization adjustment. The stabilized current and voltage are transmitted to the camera and transmission equipment for power supply, so as to achieve the purpose of automatically supplying continuous power to the camera and transmission equipment through the charger when the 220V mains power supply is powered off, so as to ensure that the highway monitoring video is always online and the video is normally online during the power outage maintenance of the 220V mains power supply.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A monitoring circuit for monitoring power supply of a highway, comprising a battery management system BMS, wherein the battery management system BMS comprises a main control chip MCU, characterized in that: Pin 1 of the main control chip MCU is electrically connected to the rectifier unit AFE, pin 3 of the main control chip MCU is electrically connected to pin 1 of the IC chip, pin 2 of the IC chip is electrically connected to pin 1 of the patch transistor G2, pin 3 of the IC chip is electrically connected to pin 1 of the patch transistor C3, pin 3 of the patch transistor G2 is electrically connected to pin 2 of the patch transistor G3, pin 1 of the patch transistor G2 is electrically connected to one end of the resistor R1, and the other end of the resistor R1 is electrically connected to pin 1 of the patch transistor G1; Pin 11 of the main control chip MCU is electrically connected to a read-only memory E2PROM, pin 10 of the main control chip MCU is electrically connected to a camera and a transmission device, power input terminals of the camera and the transmission device are electrically connected to a 220V mains power supply terminal, and the power input terminals of the camera and the transmission device are also electrically connected to a voltage stabilizing circuit, the voltage stabilizing circuit is electrically connected to the 220V mains power supply terminal, and the voltage stabilizing circuit is electrically connected to pin 12 of the main control chip MCU; Pins 7, 8 and 9 of the main control chip MCU are electrically connected to one end of the same RS485 communication interface, and the other end of the RS485 communication interface is electrically connected to the host computer U1. Pin 5 of the main control chip MCU is electrically connected to one end of the charger and one end of the load. The other end of the charger is electrically connected to pin 3 of the patch transistor G3, and the other end of the load is electrically connected to pin 3 of the patch transistor G2 and pin 2 of the patch transistor G3. One end of the charger is also electrically connected to one end of the switch S1, and the other end of the switch S1 is electrically connected to the voltage stabilizing circuit. One end of the switch S1 is electrically connected to pin 5 of the main control chip MCU, and pin 3 of the patch transistor G1 is electrically connected to one end of the fuse F1. The other end of the fuse F1 is electrically connected to one end of the fuse F2, and the other end of the fuse F2 is electrically connected to one end of the charger and the load.

2. The monitoring circuit for a highway monitoring power supply according to claim 1, characterized in that: The voltage stabilizing circuit includes a three-stage voltage stabilizing tube VR, wherein a pin 3 of the three-stage voltage stabilizing tube VR is electrically connected to one end of a resistor R2, one end of a capacitor C1 and a base of a transistor Q1, the other end of the resistor R2 and the collector of the transistor Q1 are both electrically connected to a 220V mains power supply end, the other end of the capacitor C1 is electrically connected to a pin 1 of the three-stage voltage stabilizing tube VR, the pin 1 of the three-stage voltage stabilizing tube VR is also electrically connected to one end of a resistor R3 and one end of a resistor R4, the emitter of the transistor Q1 is electrically connected to the other end of the resistor R3, the emitter of the transistor Q1 is electrically connected to one end of a resistor R5, the other end of the resistor R5 is electrically connected to one end of a capacitor C2, the other end of the capacitor C2 is electrically connected to one end of a resistor R6, the other end of the resistor R6, the other end of the resistor R4 and a pin 2 of the three-stage voltage stabilizing tube VR are all grounded, and the emitter of the transistor Q1 is electrically connected to a power supply input end of a camera and a transmission device.

3. The monitoring circuit for a highway monitoring power supply according to claim 2, characterized in that: The other end of the resistor R2 and the collector of the transistor Q1 are both electrically connected to the pin 12 and the pin 5 of the main control chip MCU.

4. The monitoring circuit for a highway monitoring power supply according to claim 1, characterized in that: The charger has a trickle shut-off function at the end of the charging current.

5. The monitoring circuit for a highway monitoring power supply according to claim 1, characterized in that: The host computer U1 communicates with the main control chip MCU through the UART1 interface, the UART2 interface and the UART3 interface. The host computer U1 is used to display the battery voltage, current, temperature, status, SOC, SOH and battery production information.

6. The monitoring circuit for a highway monitoring power supply according to claim 1, characterized in that: The rectifier unit AFE can be used to eliminate high-order harmonics in the circuit, improve the power factor, and is not affected by power grid fluctuations.

7. The monitoring circuit for a highway monitoring power supply according to claim 1, characterized in that: The voltage stabilizing circuit is used to adjust the voltage in the circuit, and the read-only memory E2PROM is used to read the current and voltage in the circuit.

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