Temperature monitoring system and method for compensation capacitor of dynamic non-contact power supply system

Abstract

The invention provides a temperature monitoring system and method for a compensation capacitor of a dynamic non-contact power supply system. The problems that an existing dynamic non-contact power supply system temperature monitoring system is complex in structure and low in cost and transmission efficiency are solved. The dynamic non-contact power supply system comprises a transmitting coil and primary side compensation circuits which are arranged in the movement direction, the temperature monitoring system comprises a main control board and N monitoring assemblies used for monitoring the temperature of capacitors of the N primary side compensation circuits, and each monitoring assembly comprises a U-shaped electricity taking device, a temperature sensor, a monitoring control board and a communication module. The temperature sensor is used for collecting the capacitance temperature of the primary side compensation circuit, the U-shaped electricity taking device is used for being coupled with the transmitting coil to supply power to the monitoring assembly, the monitoring control panel is used for controlling the temperature sensor to conduct temperature sampling and data processing, and the communication module is used for communication between the monitoring assembly and the main control panel. According to the invention, real-time acquisition of capacitor temperatures at multiple positions is realized, the system structure is simple, and the monitoring accuracy is high.

Description

Technical Field

[0001] The present invention relates to the field of wireless power transmission, and in particular to a temperature monitoring system and method for a compensation capacitor of a dynamic contactless power supply system. Background Art

[0002] In the traditional logistics industry, handling robots need to rely on cables or other wired devices for charging. This charging method is not only inefficient, but also easily restricted and affected by cables. The emergence of wireless charging technology has completely changed this situation. The track-type dynamic non-contact power supply system adopts coupled magnetic resonance technology to lay tracks on the running track of the handling robot, and install receiving coils on the handling robot. The receiving coils pick up the power from the original track and transmit the power from the laid track to the handling robot through the magnetic field, realizing real-time charging during the movement. It not only avoids the cumbersomeness of traditional wired charging methods, but also improves the efficiency and safety of charging.

[0003] In the track-type wireless charging technology, the primary track and the primary circuit form a resonant compensation network of the primary side, which enables the primary side to resonate at a fixed frequency, thereby achieving stable transmission of electric energy. During the operation of the track-type dynamic contactless power supply system, the compensation capacitor of the primary circuit will generate a large amount of heat, causing its temperature to rise, posing a safety hazard. Therefore, during the operation of the system, it is necessary to perform real-time temperature detection on the compensation capacitors of multiple primary circuits, transmit the data back to the host, and perform power-off protection.

[0004] In the track-type dynamic contactless power supply system, multiple primary circuits need to be set up. These primary circuits are distributed throughout the track and are far away from the main control cabinet. The existing temperature monitoring equipment is mostly wired temperature monitoring systems, which have the problems of complex layout and high cost. Summary of the invention

[0005] The purpose of the present invention is to provide a temperature monitoring system and method for compensation capacitors of a dynamic contactless power supply system, which is used to solve the technical problems of the complex structure, low cost and low transmission efficiency of the existing temperature monitoring system of the dynamic contactless power supply system.

[0006] A temperature monitoring system for compensation capacitors of a dynamic non-contact power supply system, the dynamic non-contact power supply system comprising a plurality of transmitting coils and a primary compensation circuit arranged along a moving direction, the temperature monitoring system comprising a main control board and N monitoring components for respectively monitoring the temperature of N primary compensation circuit capacitors, the main control board and the N monitoring components communicating data;

[0007] The monitoring components all include a U-shaped electrical collector, a temperature sensor, a monitoring control board and a communication module. The temperature sensor is used to collect the capacitor temperature of the primary compensation circuit. The U-shaped electrical collector is used to couple with the transmitting coil to power the monitoring component. The monitoring control board is used to control the temperature sensor to perform temperature sampling and data processing. The communication module is used for communication between the monitoring component and the main control board.

[0008] Optionally, the temperature sensor is a thermistor, and the thermistor is mounted on a capacitor of the primary compensation circuit.

[0009] Optionally, the primary compensation circuit is arranged in a compensation capacitor box, and a cooling fan is arranged on a side wall of the compensation capacitor box;

[0010] The cooling fan is started and stopped by the monitoring control panel, and the cooling fan is electrically connected to the output end of the U-shaped power supply.

[0011] Optionally, the communication module is a Zigbee module, and the Zigbee module includes a terminal working mode and a routing working mode.

[0012] Optionally, the Zigbee module is used to send tasks and receive messages when in terminal working mode, and the Zigbee module does not allow other nodes or terminal devices to connect;

[0013] The Zigbee module is used to forward data when in routing working mode, and the Zigbee module allows other nodes or routing devices to connect.

[0014] Optionally, it also includes an eight-bit DIP switch, and the eight-bit DIP switch is data-interoperable with the monitoring control panel;

[0015] The first to sixth digits of the eight-digit dip switch are the ID numbers of the compensation capacitor box, and the ID numbers of the N compensation capacitor boxes are all different. The seventh digit of the eight-digit dip switch is the PAN ID switch, and the eighth digit of the eight-digit dip switch is the Zigbee working mode switch.

[0016] A temperature monitoring method for a compensation capacitor of a dynamic contactless power supply system adopts the temperature monitoring system for the compensation capacitor of the dynamic contactless power supply system, and the specific steps are as follows:

[0017] S1: The monitoring control board performs ID detection on the compensation capacitor box and transmits the ID data to the Zigbee module in the compensation capacitor box, and the Zigbee module performs parameter configuration;

[0018] S2: The monitoring control board samples the voltage data of the thermistor and processes the collected data to obtain the capacitor temperature in the compensation capacitor box;

[0019] S3: The Zigbee module of the main control board sends a temperature query command, and the Zigbee of the compensation capacitor box receives the query command and sends the capacitor temperature to the main control board;

[0020] S4: The Zigbee module of the main control board receives the temperature and makes a judgment. If the temperature exceeds the limit range, power is cut off for protection. If the temperature does not exceed the limit range, it works normally.

[0021] Optionally, the parameter configuration of the Zigbee module in step S1 includes setting the ID number, PAN ID, target network address, local network address and working mode of the compensation capacitor box.

[0022] Optionally, in step S2, the collected data is processed to obtain the specific method of the capacitor temperature in the compensation capacitor box as follows:

[0023] Thermistor resistance R T for:

[0024]

[0025] Where U TEMP1 is the voltage at the terminal of the monitoring control board connected to the thermistor, R m is the preset resistance, U m is the input voltage value;

[0026] According to the resistance value R of the thermistor T And thermistor table to get the current temperature of the capacitor.

[0027] Due to the adoption of the above technical solution, the present invention has the following advantages:

[0028] 1. This application realizes real-time acquisition of compensation capacitor temperatures at multiple locations, with a simple system structure and high accuracy of temperature monitoring.

[0029] 2. The ID number of the compensation capacitor box is set by setting the eight-bit DIP switch, thereby improving the recognition accuracy of the system compensation capacitor box.

[0030] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings of the present invention are as follows.

[0032] Figure 1It is a structural schematic diagram of the temperature monitoring system of the present invention.

[0033] Figure 2 It is a schematic diagram of the structure of the monitoring component of the present invention.

[0034] Figure 3 Flow chart of the temperature monitoring method of the present invention.

[0035] Figure 4 It is the principle diagram of the thermistor temperature detection circuit of the present invention.

[0036] Figure 5 This is a data transmission flow chart for temperature monitoring of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] Embodiment 1:

[0039] The dynamic contactless power supply system includes a primary circuit and a secondary circuit. The primary circuit includes a main control cabinet, a plurality of primary compensation circuits and a plurality of transmitting coils. A high-frequency inverter circuit is arranged in the main control cabinet. The high-frequency inverter circuit applies the three-phase DC to the primary compensation circuit after rectification and inversion. The primary compensation circuit transmits the electric energy to the transmitting coil. The plurality of transmitting coils constitute the primary track. The secondary circuit includes a receiving coil, a secondary compensation circuit and a rectifier filter circuit which are sequentially connected to the vehicle to be charged. The output end of the rectifier filter circuit is connected to the load of the vehicle to be charged.

[0040] In this embodiment, the primary compensation circuit is arranged in a compensation capacitor box, and the compensation capacitor box is arranged on one side of the track. The primary compensation circuit and the secondary compensation circuit are of LCC-S topology, that is, the primary compensation circuit has two compensation capacitors.

[0041] like Figure 1 As shown, a temperature monitoring system for compensation capacitors of a dynamic contactless power supply system includes a main control board and N monitoring components for respectively monitoring the temperature of capacitors of N primary compensation circuits, wherein the main control board and the N monitoring components communicate with each other;

[0042] like Figure 2 As shown, the monitoring components include a U-shaped electrical collector, a temperature sensor, a monitoring control board and a communication module. The temperature sensor is used to collect the capacitor temperature of the primary compensation circuit, the U-shaped electrical collector is used to couple with the transmitting coil to power the monitoring component, the monitoring control board is used to control the temperature sensor to perform temperature sampling and data processing, and the communication module is used for communication between the monitoring component and the main control board.

[0043] In this embodiment, the main control board is arranged in the main control cabinet, the monitoring control board uses an STM32 single-chip microcomputer, whose model is STM32G030F6P6, and the STM32 single-chip microcomputer is installed on the circuit board. The structure of the U-shaped power supply is the same as that of the secondary circuit. The U-shaped power supply takes power by coupling with the primary circuit. The output end of the U-shaped power supply is electrically connected to the circuit board, and the current is converted into 12V and 3.3V through the half-wave rectification and linear regulator module to power the circuit components such as the single-chip microcomputer.

[0044] As an embodiment of the present application, the temperature sensor is a thermistor, and the thermistor is mounted on a capacitor of the primary compensation circuit.

[0045] In this embodiment, the temperature detection circuit principle is as follows Figure 4 As shown in the figure: T1 is a thermistor, TEMP1 is a serial port connected to the STM32 microcontroller, and transmits AD sampled data. The voltage U at the thermistor T1 TEMP1 for:

[0046]

[0047] Where U m is the input voltage value, R9 presets the resistance;

[0048] Thermistor resistance R T for:

[0049]

[0050] According to the resistance value R of the thermistor T And thermistor table to get the current temperature of the capacitor.

[0051] As an embodiment of the present application, the primary compensation circuit is arranged in a compensation capacitor box, and a cooling fan is arranged on a side wall of the compensation capacitor box;

[0052] The cooling fan is started and stopped by the monitoring control panel, and the cooling fan is electrically connected to the output end of the U-shaped power supply.

[0053] In this embodiment, the heat dissipation and cooling of the compensation capacitor box is performed by a heat dissipation fan, and the heat dissipation fan is connected to the circuit board, and is powered and controlled by the circuit board. During use, when the dynamic contactless power supply system is running, the monitoring control board sends a control instruction to drive the heat dissipation fan to run, and when the dynamic contactless power supply system stops, the monitoring control board sends a control instruction to drive the heat dissipation fan to stop.

[0054] As an embodiment of the present application, the communication module is a Zigbee module, and the Zigbee module includes a terminal working mode and a routing working mode.

[0055] In this embodiment, the two working modes are controlled by the eighth switch of the eight-position dial switch. The main task of the Zigbee module in the terminal working mode is to send tasks and receive messages. Other nodes are not allowed to be connected to the terminal device. When there is no data transmission or reception, it enters the dormant state. When data needs to be transmitted or received, it is awakened by the MCU to enter the working state. The Zigbee module is in the routing working mode, allowing other nodes to be connected to the routing device to expand the coverage of the network. The main task is to forward data and play the role of relay routing. The router must remain active to ensure real-time forwarding of terminal data because it is not allowed to enter the dormant state. In addition, the communication efficiency of Zigbee will decrease with the increase of the routing level, so the router must be arranged as needed.

[0056] As an embodiment of the present application, it also includes an eight-bit DIP switch, and the eight-bit DIP switch is data-interoperable with the monitoring control board;

[0057] The first to sixth digits of the eight-digit dip switch are the ID numbers of the compensation capacitor box, and the ID numbers of the N compensation capacitor boxes are all different. The seventh digit of the eight-digit dip switch is the PAN ID switch, and the eighth digit of the eight-digit dip switch is the Zigbee working mode switch.

[0058] In this embodiment, pressing the corresponding first to sixth buttons can digitally number the capacitor boxes in the system; pressing the seventh digit can switch the PAN ID from the default 1001 to 1002, and the device can only communicate in the Zigbee network with the same PAN ID; pressing the eighth digit can switch the Zigbee working mode from routing mode to terminal mode.

[0059] Embodiment 2:

[0060] like Figure 3 A method for monitoring the temperature of a compensation capacitor of a dynamic contactless power supply system is shown, using the temperature monitoring system for the compensation capacitor of a dynamic contactless power supply system described in Example 1, and the specific steps are as follows:

[0061] S1: The monitoring control board performs ID detection on the compensation capacitor box and transmits the ID data to the Zigbee module in the compensation capacitor box, and the Zigbee module performs parameter configuration;

[0062] In this embodiment, if Figure 5 As shown, the STM32 microcontroller of the compensation capacitor box sends the detected ID data and temperature data to the Zigbee module in the compensation capacitor box by using serial communication. The Zigbee module in the compensation capacitor box receives the signal from the microcontroller and performs self-setting. It is necessary to set its own ID number, PANID, target network address, local network address and working mode of the Zigbee module.

[0063] S2: The monitoring control board samples the voltage data of the thermistor and processes the collected data to obtain the capacitor temperature in the compensation capacitor box;

[0064] S3: The Zigbee module of the main control board sends a temperature query command, and the Zigbee of the compensation capacitor box receives the query command and sends the capacitor temperature to the main control board;

[0065] S4: The Zigbee module of the main control board receives the temperature and makes a judgment. If the temperature exceeds the limit range, power is cut off for protection. If the temperature does not exceed the limit range, it works normally.

[0066] In this embodiment, if Figure 5 As shown, the main control board in the main control cabinet sends a query command through the Zigbee module, the Zigbee module of the corresponding numbered compensation capacitor box receives the signal and transmits the temperature data, and the Zigbee module of the main control cabinet receives the temperature and makes a judgment.

[0067] In this embodiment, the compensation capacitor of the dynamic contactless power supply system generates a lot of heat during operation. After two hours of operation, it can be found through experiments that the temperature of the internal capacitor rises from room temperature to 64.4°C. The high temperature will affect the normal operation of the system and pose a safety hazard, so it needs to be cooled. A fan is used to cool it by convection to protect it.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A temperature monitoring system for a compensation capacitor of a dynamic non-contact power supply system, the dynamic non-contact power supply system comprising a plurality of transmitting coils and a primary compensation circuit arranged along a moving direction, characterized in that: The temperature monitoring system includes a main control board and N monitoring components for respectively monitoring the temperature of N primary compensation circuit capacitors, wherein the main control board and the N monitoring components are in data communication; The monitoring components all include a U-shaped electrical collector, a temperature sensor, a monitoring control board and a communication module. The temperature sensor is used to collect the capacitor temperature of the primary compensation circuit. The U-shaped electrical collector is used to couple with the transmitting coil to power the monitoring component. The monitoring control board is used to control the temperature sensor to perform temperature sampling and data processing. The communication module is used for communication between the monitoring component and the main control board.

2. According to claim 1, a temperature monitoring system for compensation capacitor of a dynamic contactless power supply system is characterized in that: The temperature sensor is a thermistor, and the thermistor is attached to the capacitor of the primary compensation circuit.

3. The temperature monitoring system of the compensation capacitor of the dynamic contactless power supply system according to claim 2 is characterized in that: The primary compensation circuit is arranged in a compensation capacitor box, and a heat dissipation fan is arranged on a side wall of the compensation capacitor box; The cooling fan is started and stopped by the monitoring control panel, and the cooling fan is electrically connected to the output end of the U-shaped power supply.

4. According to claim 3, a temperature monitoring system for a compensation capacitor box of a dynamic contactless power supply system is characterized in that: The communication module is a Zigbee module, and the Zigbee module includes a terminal working mode and a routing working mode.

5. The temperature monitoring system of the compensation capacitor box of a dynamic contactless power supply system according to claim 4 is characterized in that: The Zigbee module is used to send tasks and receive messages when in terminal working mode, and the Zigbee module does not allow other nodes or terminal devices to connect; The Zigbee module is used to forward data when in routing working mode, and the Zigbee module allows other nodes or routing devices to connect.

6. The temperature monitoring system of the compensation capacitor box of a dynamic contactless power supply system according to claim 4 is characterized in that: It also includes an eight-position dial switch, and the eight-position dial switch is data-interoperable with the monitoring control panel; The first to sixth digits of the eight-digit dip switch are the ID numbers of the compensation capacitor box, and the ID numbers of the N compensation capacitor boxes are all different. The seventh digit of the eight-digit dip switch is the PAN ID switch, and the eighth digit of the eight-digit dip switch is the Zigbee working mode switch.

7. A temperature monitoring method for a compensation capacitor of a dynamic contactless power supply system, characterized in that: The temperature monitoring system of the compensation capacitor of the dynamic contactless power supply system according to claim 6 is adopted, and the specific steps are as follows: S1: The monitoring control board performs ID detection on the compensation capacitor box and transmits the ID data to the Zigbee module in the compensation capacitor box, and the Zigbee module performs parameter configuration; S2: The monitoring control board samples the voltage data of the thermistor and processes the collected data to obtain the capacitor temperature in the compensation capacitor box; S3: The Zigbee module of the main control board sends a temperature query command, and the Zigbee of the compensation capacitor box receives the query command and sends the capacitor temperature to the main control board; S4: The Zigbee module of the main control board receives the temperature and makes a judgment. If the temperature exceeds the limit range, power is cut off for protection. If the temperature does not exceed the limit range, it works normally.

8. The temperature monitoring method of the compensation capacitor box of a dynamic contactless power supply system according to claim 7 is characterized in that: In step S1, the Zigbee module performs parameter configuration including setting the ID number, PAN ID, target network address, local network address and working mode of the compensation capacitor box.

9. The temperature monitoring method of the compensation capacitor box of a dynamic contactless power supply system according to claim 7 is characterized in that: In step S2, the collected data is processed to obtain the specific method of compensating the capacitor temperature in the capacitor box as follows: Thermistor resistance R T for: Where U TEMP1 is the voltage at the terminal of the monitoring control board connected to the thermistor, R m is the preset resistance, U m is the input voltage value; According to the resistance value R of the thermistor T And thermistor table to get the current temperature of the capacitor.

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