A PTC heating module, a PTC heater and a new energy vehicle

Abstract

The application discloses a PTC heating module and relates to the technical field of PTC heaters. The PTC heating module comprises a low-voltage power supply system for providing a low-voltage power supply for a control system; a low / high-voltage power supply system for boosting and isolating the low-voltage power supply and supplying a high-voltage power supply system, and intelligently controlling the switch signal of a PTC battery heating pack through a low-voltage control signal; and a high-voltage power supply system for controlling the PTC battery heating pack to be turned on or turned off according to the switch signal, and transmitting the current, voltage and temperature data of the PTC battery heating pack during work to the control system by using a sensor. The low / high-voltage power supply system has the characteristics of simple structure, low cost and high isolation. The low / high-voltage power supply system isolates the low-voltage power supply system and the high-voltage power supply system, so that the low-voltage power supply system and the high-voltage power supply system do not interfere with each other when working at the same time, the product is safer and more reliable, and the safety of the vehicle-mounted PTC is improved.

Description

Technical Field

[0001] This invention relates to the field of PTC heater technology, specifically to a PTC heating module, a PTC heater, and a new energy vehicle. Background Technology

[0002] With increasing global awareness of environmental protection and the deepening implementation of sustainable development goals, the electric vehicle market is experiencing unprecedented rapid growth. According to data from the International Energy Agency (IEA), global electric vehicle (EV) sales reached 11 million units in 2023, a year-on-year increase of 42%. Because electric vehicles lack the waste heat generated by traditional internal combustion engines, they must rely on electric heating systems to provide interior heating and battery thermal management. PTC heaters, with their rapid heating, low power consumption, and high safety features, have become the preferred solution for electric vehicle air conditioning systems. As a core component of the electric vehicle thermal management system, the market demand for PTC heaters has grown significantly in this context.

[0003] Traditional PTC heaters mainly consist of five parts: a central processing unit (MCU), a circuit board intelligent control circuit, a power drive circuit, a temperature detection module acquisition / control circuit, a power input / conversion / output circuit, a protection circuit, a heat dissipation device, and a PTC heating element. Among them, the circuit board intelligent control circuit includes functions related to extended I / O interfaces, which can communicate with the vehicle control system via CAN / LIN protocols to achieve monitoring and intelligent control of the PTC heating function.

[0004] PTC technology has successfully solved the pain points of heating in new energy vehicle manufacturers, and the heating function has certain linearity and other characteristics, which has improved the application scenarios of the product. At present, the product has been widely used in the automotive, home appliance, industrial, consumer electronics, medical, aerospace and energy fields, among which the demand in the automotive field is also growing explosively.

[0005] With the rapid growth in demand for PTC modules in new energy vehicles, the fast heating, low power consumption, intelligent control, and highly isolated power circuit design of PTC heaters make them safer, more reliable, and more cost-effective for use in automotive projects.

[0006] Existing conventional PTC heaters, in most cases, isolate the low-voltage and high-voltage sections to ensure that the operation of the low-voltage power supply system is not affected by the operation of the high-voltage section. Specifically, for example... Figure 1As shown, in the circuit design process, the 12V input voltage of the automotive central control module in the low-voltage part needs to be converted into a 5V voltage that the MCU can use. Then, a boost isolation scheme is used to convert the 5V into a 15V IGBT control voltage. Then, the high-voltage and low-voltage parts are isolated to ensure that the control system in the low-voltage area is isolated from the high-voltage control system, so that the high-voltage power system of up to 450V will not cause overvoltage damage or other effects to the low-voltage intelligent control system.

[0007] In the isolation process, it is necessary to first select the relevant boost chips and then use the isolation transformer for design. This design is costly. In addition, the power system of the high-voltage sensor is in the same power system as the isolation transformer, and the power system of the sensor is in the same power system as the PTC heating pack. The isolation is insufficient and the safety is not high. Summary of the Invention

[0008] The purpose of this invention is to provide a PTC heating module, a PTC heater, and a new energy vehicle, which solves the problems of insufficient isolation and low safety in the power supply system of the existing PTC heating module.

[0009] This invention is achieved through the following technical solution:

[0010] In a first aspect, the first embodiment of the present invention provides a PTC heating module, which includes a low-voltage power supply system and a high-voltage power supply system, and further includes: a low / high-voltage power supply system, wherein the low / high-voltage power supply system is connected to the low-voltage power supply system and the high-voltage power supply system respectively.

[0011] The low-voltage power supply system is used to provide low-voltage power to the control system;

[0012] The low / high voltage power supply system boosts and isolates the low voltage power supply before supplying it to the high voltage power supply system, and intelligently controls the switching signal of the PTC battery heating pack through the low voltage control signal.

[0013] The high-voltage power supply system controls the PTC battery heating pack to turn on or off according to the switch signal, and uses sensors to collect the current, voltage and temperature data of the PTC battery heating pack when it is working and transmits them to the control system.

[0014] Furthermore, the low-voltage power supply system includes a filter module, a first LDO voltage regulator module, a boost module, and a drive module connected in sequence;

[0015] The filtering module is used to filter the input voltage;

[0016] The first LDO voltage regulator module is used to regulate the filtered voltage and provide power to the control system.

[0017] The boost module is used to boost the output voltage of the first LDO voltage regulator module to power the drive module;

[0018] The drive module is used to provide drive signals for low / high voltage power supply systems.

[0019] Furthermore, the low / high voltage power supply system includes a push-pull power supply circuit, which is used to achieve electrical isolation between the low voltage power supply system and the high voltage power supply system.

[0020] Furthermore, the push-pull power supply circuit includes a push-pull transformer, a power control module, a power conversion and filtering module, and a second LDO voltage regulator module. The output terminal of the push-pull transformer is connected to the power control module and the power conversion and filtering module, respectively, and the output terminal of the power conversion and filtering module is connected to the second LDO voltage regulator module.

[0021] Furthermore, the power control module includes a first switching diode and a second switching diode, which are respectively connected to the same output terminal of the push-pull transformer, and the first switching diode and the second switching diode work alternately.

[0022] Furthermore, the low / high voltage power supply system also includes an IGBT module, which is used to control the on / off state of the PTC battery heating pack in the high voltage power supply system.

[0023] Furthermore, the high-voltage power supply system includes a PTC battery heating pack, a current detection module, a temperature detection module, and an isolation module.

[0024] The PTC battery heating pack operates or stops operating under the control of the IGBT module.

[0025] The current detection module is used to collect current and voltage data of the PTC battery heating pack during operation;

[0026] The temperature detection module is used to collect the temperature of the PTC battery heating pack during operation;

[0027] The isolation module is used to isolate the current detection module and temperature detection module from the low-voltage / high-voltage power supply system and the PTC battery heating pack, respectively.

[0028] Furthermore, the low-voltage power supply system, the high-voltage power supply system, and the low / high-voltage power supply system each have an independent grounding system.

[0029] Secondly, a PTC heater provided in the second embodiment of the present invention includes the PTC heating module described in the first embodiment above.

[0030] Thirdly, another embodiment of the present invention provides a new energy vehicle, including the PTC heater described in the second embodiment above.

[0031] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0032] This invention provides a PTC heating module, a PTC heater, and a new energy vehicle. The low / high voltage power supply system features a simple structure, low cost, and high isolation. It effectively controls and regulates the on / off switching of the PTC battery heating pack in the high voltage power supply system via a low-voltage control signal. The low / high voltage power supply system isolates the low-voltage and high-voltage power supply systems, ensuring they operate simultaneously without interference, thus enhancing product safety and reliability and improving the safety of the vehicle-mounted PTC. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0034] Figure 1 This is a partial circuit diagram of a PTC heating module in the prior art;

[0035] Figure 2 This is a schematic diagram of the structure of a PTC heating module provided in the first embodiment of the present invention;

[0036] Figure 3 This is a circuit diagram of the boost module in the first embodiment of the present invention;

[0037] Figure 4 This is a circuit diagram of the driving module in the first embodiment of the present invention;

[0038] Figure 5 This is a circuit diagram of the low / high voltage power supply system in the first embodiment of the present invention;

[0039] Figure 6 This is a circuit diagram of the current detection module in the first embodiment of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0041] like Figure 2 As shown, the first embodiment of the present invention provides a PTC heating module, including a low-voltage power supply system, a low / high-voltage power supply system, and a high-voltage power supply system. The low / high-voltage power supply system is connected to the low-voltage power supply system and the high-voltage power supply system, respectively. The low-voltage power supply system provides low-voltage power to the control circuit. The low / high-voltage power supply system boosts and isolates the low-voltage power supply before supplying it to the high-voltage power supply system, and intelligently controls the switching signal of the PTC battery heating pack through the low-voltage control signal. The high-voltage power supply system controls the PTC battery heating pack to turn on or off according to the switching signal, and uses sensors to collect the current, voltage, and temperature data of the PTC battery heating pack during operation and transmits them to the control system.

[0042] In this embodiment, the low-voltage power supply system includes a filter module, a first LDO voltage regulator module, a boost module, and a drive module connected in sequence. The filter module filters the input voltage, the first LDO voltage regulator module regulates the filtered voltage to provide power to the control system, the boost module boosts the output voltage of the first LDO voltage regulator module to power the drive module, and the drive module provides drive signals to the low / high voltage power supply system. The 12V voltage input to the vehicle's central control system is filtered by the filter module, and the output voltage is regulated by the first LDO voltage regulator module to output 5V, providing power to the control system. The boost module uses a push-pull boost chip to boost the 5V voltage to 15V. The push-pull boost circuit design is simple and has lower circuit construction costs. The boost module includes a TPS61040-Q1 high-frequency boost converter. The TPS61040-Q1 high-frequency boost converter has an input voltage range of 1.8V-6V and an output voltage range of up to 28V, and has an internal 400mA switching current limit.

[0043] like Figure 3As shown, the boost module includes a TPS61040-Q1 chip, capacitors C1425, C1426, and C1427, an inductor L504, resistors R1052, R1053, and R1054, and a switching transistor diode D26. The fifth pin of the TPS61040-Q1 chip is connected to one end of inductor L504, one end of capacitor C1425, and the output terminal LDOOUT of the first LDO regulator module. The fourth pin of the TPS61040-Q1 chip is connected to the fifth pin of the TPS61040-Q1 chip. The first pin of the TPS61040-Q1 chip is connected to the other end of inductor L504. One end is connected to the positive terminal of the switching transistor diode D26. The third pin of the TPS61040-Q1 chip is connected to one end of resistor R1052, one end of resistor R1053, and one end of capacitor C1426. The other end of resistor R1052, the other end of capacitor C1426, the negative terminal of switching transistor diode D26, and one end of capacitor C1427 are connected to the output 15V+. The other end of capacitor C1425, the other end of resistor R1053, the other end of capacitor C1427, the second pin of the TPS61040-Q1 chip, and one end of resistor R1054 are connected to ground. The other end of resistor R1054 is connected to the output 15V-.

[0044] like Figure 4As shown, the driver module includes an SA52731 chip, capacitors C158, C159, C160, C161, C162, C163, C1398, resistors R85, R86, R87, and R1063. The SA52731 chip is a 500mA, 3.3V~5V push-pull transformer driver designed to provide a simple solution for isolated power supplies. The SA52731 features soft-start characteristics to prevent large inrush currents during power-up. Its internal protection functions include current limiting, undervoltage lockout, and thermal shutdown. The SA52731 uses a compact SOT23-5 package and has a rated operating temperature between –40°C and 125°C, meeting the requirements of small-size, low-power, high-reliability isolated power supply applications. Pin 5 of the SA52731 chip is the voltage input terminal. A 5V voltage is divided by resistor R84 and then applied to pin 5 of the SA52731 chip. Pin 5 of the SA52731 chip is connected to one end of capacitor C158, one end of capacitor C159, one end of resistor R85, one end of resistor R86, and one end of resistor R1063. The other ends of capacitors C158 and C159, as well as pins 4 and 6 of the SA52731 chip, are grounded. The other end of resistor R85 is connected to one end of capacitor C160, and the other end of capacitor C160 is connected to pin 3 of the SA52731 chip. Pin 3 of the SA52731 chip outputs 15V+. The other end of resistor R86 is connected to one end of capacitor C161. The other end of capacitor C161 is connected to one end of capacitor C163 and the first pin of the SA52731 chip. The first pin of the SA52731 chip outputs 15V-. The other end of capacitor C163 is connected to one end of resistor R87. The other end of resistor R87 is grounded. The other end of resistor R1063 is connected to the second pin of the SA52731 chip. The second pin of the SA52731 chip outputs 5V. The second pin of the SA52731 chip is also connected to one end of capacitor C162 and one end of capacitor C1398. The other ends of capacitor C162 and the other ends of capacitor C1398 are grounded.

[0045] like Figure 5As shown, the low / high voltage power supply system includes a push-pull power supply circuit, which is used to achieve electrical isolation between the low-voltage and high-voltage power supply systems. The push-pull power supply circuit includes a push-pull transformer, a power control module, a power conversion and filtering module, and a second LDO voltage regulator module. The output terminal of the push-pull transformer is connected to both the power control module and the power conversion and filtering module, and the output terminal of the power conversion and filtering module is connected to the second LDO voltage regulator module. The power control module includes a first switching diode and a second switching diode, which are respectively connected to the same output terminal of the push-pull transformer. The first and second switching diodes operate alternately. The switching diodes are Schottky diodes.The power control module includes switching transistors D21 and D22. The power conversion and filtering module includes resistors R88 and R89, capacitors C164 and C165, resistors R90 and R91, electrolytic capacitor C171, inductor L2, capacitors C166, C167, C168, and C169, switching diode D23, capacitors C1423 and C1424, electrolytic capacitor C170, resistors R1019, R1020, R1048, and R1049. The 15V+ output from the drive module is connected to the first terminal of the push-pull transformer T106 via resistor R1058. The output of the drive module... The 15V- voltage is connected to the third terminal of the push-pull transformer T106 via resistor R1059. The 5V output from the driver module is connected to the third terminal of the push-pull transformer T106 via resistor R1050. The fifth terminal of the push-pull transformer T106 is connected to one end of resistor R88 and one end of resistor R89. The other end of resistor R88 is connected to the VSSS terminal, and the other end of resistor R89 ​​is connected to the HV- terminal. The fourth terminal of the push-pull transformer T106 is connected to one end of capacitor C166, one end of capacitor C167, one end of capacitor C168, one end of capacitor C169, and the positive terminal of switching diode D23. The other ends of capacitors C166 and C167 are connected to the positive terminal of the switching diode D23. After connection, connect the VSSS terminal. The sixth terminal of the push-pull transformer T106 is connected to the positive terminals of switching transistors D21 and D22, one end of capacitor C164, and one end of capacitor C165. The other end of capacitor C164 is connected to one end of resistor R90. The other end of resistor R90 is connected to the positive terminal of electrolytic capacitor C171 and the VSSS terminal. The negative terminal of switching transistor D21 is connected to the positive terminal of electrolytic capacitor C171 and one end of inductor L2. The other end of capacitor C165 is connected to one end of resistor R91. The other end of resistor R91 is connected to the negative terminal of switching diode D22, and then to the other end of capacitor C168 and capacitor C165. The other end of resistor L2, the negative terminal of switching diode D23, one end of capacitor C1423, one end of capacitor C1424, and the positive terminal of electrolytic capacitor C170 are connected to the VCCC terminal. One end of resistor R1019 and one end of resistor R1049 are connected to the other end of inductor L2. One end of resistor R1020 and one end of resistor R1048 are connected to the VSSS terminal. The other end of resistor R1048 is connected to the other end of capacitor C1424, the other end of resistor R1049, and the other end of capacitor C1423. The other end of resistor R1019 and the other end of resistor R1020 are connected to the negative terminal of electrolytic capacitor C170. The two switching diodes at the output of the push-pull transformer work alternately, which is equivalent to two switching power supplies outputting power simultaneously. The output power is approximately twice that of a single switching power supply.In this embodiment, a push-pull boost circuit combined with a push-pull transformer is used to replace the traditional flyback switching power supply with a transformer design, which effectively improves the power output capability and sensor utilization efficiency, and reduces product cost.

[0046] The second LDO regulator module includes a TLE42664G chip, capacitors C1399, C172, C173, C174, and C175, resistors R1060, R1061, and R92. Inductor L2 is connected to one end of each of capacitors C1399, C172, R1061, C173, C174, and C175, and then connected to the HV- terminal. The VSSS terminal is connected to one end of resistor R1060. The other ends of resistors R1060 and R1061 are connected to the TLE42664G chip. The fourth pin of the 42664G chip is connected to the second pin of the TLE42664G chip, which is connected to one end of resistor R92. The first pin of the TLE42664G chip is connected to the other end of capacitor C1399, the other end of capacitor C172, and the other end of resistor R92, and then connected to the VCCC terminal. The third pin of the TLE42664G chip is connected to the other end of capacitor C173, the other end of capacitor C174, and the other end of capacitor C175, and then connected to LDO_VDD_5V, which is the 5V output power of the low-voltage / high-voltage power supply system, which is different from the 5V output of the low-voltage power supply system.

[0047] This invention provides a PTC heating module that divides the power supply into a low-voltage power system, a low-voltage / high-voltage power system, and a high-voltage power system. Each of these systems has an independent grounding system. The power supply VCC and ground GND constitute the low-voltage power system, while HV+ and HV- constitute the high-voltage power system. The VCCC and VSSS terminals output from the push-pull transformer constitute the low-voltage / high-voltage power system. The low-voltage / high-voltage power system primarily functions to intelligently control the high-voltage switch control signal from the low-voltage control signal, thereby regulating the heating of the PTC battery heating pack.

[0048] The low / high voltage power supply system also includes an IGBT module, which is used to control the on / off state of the PTC battery heating pack in the high voltage power supply system. The IGBT module can be implemented using existing technology.

[0049] The high-voltage power supply system includes a PTC battery heating pack, a current detection module, a temperature detection module, and an isolation module. The PTC battery heating pack operates or stops under the control of the IGBT module. The current detection module is used to collect current and voltage data of the PTC battery heating pack during operation. The temperature detection module is used to collect the temperature of the PTC battery heating pack during operation. The current detection module and the temperature detection module transmit the collected data to the control system. The isolation module is used to isolate the current detection module and the temperature detection module from the low-voltage / high-voltage power supply system and the PTC battery heating pack, respectively.

[0050] like Figure 6 As shown, the current detection module includes an ACS724 chip, resistors R1030, R1031, R1034, R1035, R8, R9, R93, RT2, and capacitors C6, C7, C8, C9, C1412, and C1419. The ACS724 chip is a Hall sensor. Pins 1, 2, 3, and 4 of the ACS724 chip are connected to the IGBT_VSS terminal of the driver module. Pins 5, 6, 7, and 8 of the ACS724 chip are connected to the HV- terminal of the high-voltage power supply system and one end of capacitor C6. The other end of capacitor C6 is connected to the TEMP_BGT terminal and one end of resistor R8. The other end of resistor R8 is connected to one end of resistor R93, one end of resistor RT2, and one end of resistor R9, and then connected to the IGBT_TEMP terminal of the driver module. The other end of resistor R9 is connected to the output terminal LDO_V of the low-voltage / high-voltage power supply system. DD_5V, the other end of resistor R93 is connected to the HV- terminal of the high-voltage power supply, one end of resistor R1034, and one end of capacitor C1419. The other end of resistor R1034 and the other end of capacitor C1419 are connected to the other end of resistor RT2 and one end of resistor R1035 (TEMP_BGT terminal). The other end of resistor R1035 is connected to ADC_PA2. The tenth pin of the ACS724 chip is connected to the 5V low-voltage power supply, one end of capacitor C8, and one end of capacitor C9. The other end of capacitor C8 and the other end of capacitor C9 are connected to ground. The twelfth pin of the ACS724 chip is connected to one end of resistor R1031 and one end of capacitor C1412. The other end of resistor R1031 is connected to PC0 terminal. The other end of capacitor C1412 is grounded. The thirteenth pin of the ACS724 chip is connected to capacitor C7 and then grounded. The fourteenth pin of the ACS724 chip is connected to resistor R1030 and then grounded. The fifteenth pin of the ACS724 chip is grounded.

[0051] The isolation module isolates the current and temperature detection modules from the low-voltage / high-voltage power supply system and the PTC battery heating pack, respectively. The isolation module uses the 220N31 chip, which has two bidirectional isolation channels, one for isolating the clock and the other for the data line, suitable for applications with multiple main components. By using the isolation module to provide secondary isolation between the high-voltage and low / high-voltage power supply systems, the control signals from the low-voltage section are isolated twice while controlling the functions of the high-voltage power circuit, resulting in higher product isolation.

[0052] The first embodiment of this invention provides a PTC heating module with a low / high voltage power supply system. This system is characterized by its simple structure, low cost, and high isolation. The low-voltage control signal effectively controls and regulates the on / off switching of the PTC battery heating pack in the high-voltage power supply system. By isolating the low-voltage and high-voltage power supply systems, they operate simultaneously without interference, making the product safer and more reliable, thereby improving the safety of vehicle-mounted PTC systems.

[0053] The second embodiment of the present invention provides a PTC heater, which includes the PTC heating module described in the first embodiment above.

[0054] The third embodiment of the present invention provides a new energy vehicle, including the PTC heater described in the second embodiment above.

[0055] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A PTC heating module, comprising a low-voltage power supply system and a high-voltage power supply system, characterized in that, Also includes: A low / high voltage power supply system, wherein the low / high voltage power supply system is connected to a low voltage power supply system and a high voltage power supply system respectively; The low-voltage power supply system is used to provide low-voltage power to the control circuit; The low / high voltage power supply system boosts and isolates the low voltage power supply before supplying it to the high voltage power supply system, and intelligently controls the switching signal of the PTC battery heating pack through the low voltage control signal. The high-voltage power supply system controls the PTC battery heating pack to turn on or off according to the switch signal, and uses sensors to collect the current, voltage and temperature data of the PTC battery heating pack when it is working and transmits them to the control system.

2. The PTC heating module according to claim 1, characterized in that, The low-voltage power supply system includes a filter module, a first LDO voltage regulator module, a boost module, and a drive module connected in sequence. The filtering module is used to filter the input voltage; The first LDO voltage regulator module is used to regulate the filtered voltage and provide power to the control system. The boost module is used to boost the output voltage of the first LDO voltage regulator module to power the drive module; The drive module is used to provide drive signals for low / high voltage power supply systems.

3. The PTC heating module according to claim 2, characterized in that, The low / high voltage power supply system includes a push-pull power supply circuit, which is used to achieve electrical isolation between the low voltage power supply system and the high voltage power supply system.

4. The PTC heating module according to claim 3, characterized in that, The push-pull power supply circuit includes: a push-pull transformer, a power control module, a power conversion and filtering module, and a second LDO voltage regulator module. The output terminal of the push-pull transformer is connected to the power control module and the power conversion and filtering module, respectively, and the output terminal of the power conversion and filtering module is connected to the second LDO voltage regulator module.

5. The PTC heating module according to claim 4, characterized in that, The power control module includes a first switching diode and a second switching diode, which are respectively connected to the same output terminal of the push-pull transformer, and the first switching diode and the second switching diode work alternately.

6. The PTC heating module according to claim 3 or 5, characterized in that, The low / high voltage power supply system also includes an IGBT module, which is used to control the on / off state of the PTC battery heating pack in the high voltage power supply system.

7. The PTC heating module according to claim 6, characterized in that, The high-voltage power supply system includes a PTC battery heating pack, a current detection module, a temperature detection module, and an isolation module. The PTC battery heating pack operates or stops operating under the control of the IGBT module. The current detection module is used to collect current and voltage data of the PTC battery heating pack during operation; The temperature detection module is used to collect the temperature of the PTC battery heating pack during operation; The isolation module is used to isolate the current detection module and temperature detection module from the low-voltage / high-voltage power supply system and the PTC battery heating pack, respectively.

8. The PTC heating module according to claim 1, characterized in that, The low-voltage power supply system, high-voltage power supply system, and low / high-voltage power supply system each have an independent grounding system.

9. A PTC heater, characterized in that, Includes the PTC heating module as described in any one of claims 1-8.

10. A new energy vehicle, characterized in that, Includes the PTC heater as described in claim 9.

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