Ptc heating control device and ptc heating system

Abstract

The utility model discloses a PTC heating control device and PTC heating system. PTC heating control device, include: control module, public communication module, wind warm power control module, water heating power control module, wind warm power control module and wind warm heating core body are located in wind warm heating loop, and water heating power control module and water warm heating core body are located in water warm heating loop, and control module controls the on-off of wind warm power control module to make wind warm heating loop conduction or open, and control module controls the on-off of water heating power control module to make water warm heating loop conduction or open. The application can integrate the originally two independent control modules into one control module.

Description

Technical Field

[0001] This utility model relates to the field of PTC heating technology, and in particular to a PTC heating control device and a PTC heating system. Background Technology

[0002] The development trend of PTC heaters for new energy vehicles shows a significant growth momentum, mainly due to the rapid expansion of the electric vehicle market. PTC heaters are not only used in pure electric vehicles, but also widely used in various types of new energy vehicles such as plug-in hybrid electric vehicles and hydrogen fuel cell vehicles.

[0003] With the continuous development of new energy vehicle technology, PTC heaters are needed for both in-vehicle heating and battery heating to meet winter driving requirements. Since these two different operating environments need to be addressed simultaneously, two separate heaters are required: one for the air conditioning system and the other for the battery pack's thermal management system. Each heater exists independently and performs its own function, equipped with its own heating actuator, communication modules, control modules, and other circuitry. The presence of two independent heaters results in a larger number of components, hindering weight reduction and increasing the number of control wiring harnesses used throughout the vehicle, which is detrimental to overall product layout and also increases costs. Utility Model Content The purpose of this utility model is to provide a PTC heating control device and a PTC heating system that can solve at least one of the technical problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides a PTC heating control device, comprising: a control module and a common communication module, a fan heating power control module, and a water heating power control module electrically connected to the control module. The control module is communicatively connected to a thermal management control system through the common communication module. The fan heating power control module and the fan heating core are located in the fan heating circuit, and the water heating power control module and the water heating core are located in the water heating circuit. The control module is configured to independently control the on / off state of the fan heating power control module to make the fan heating circuit conduct or disconnect according to instructions received through the common communication module, and to independently control the on / off state of the water heating power control module to make the water heating circuit conduct or disconnect.

[0005] Optionally, the control module includes a master control module and a slave control module that are electrically connected to each other. The master control module is electrically connected to the common communication module, and the slave control module is electrically connected to the air heating power control module and the water heating power control module.

[0006] Optionally, an isolation communication module is connected between the main control module and the slave control module. The isolation communication module is configured to transmit signals and provide electrical isolation between the main control module and the slave control module.

[0007] Optionally, the isolation communication module includes an isolation communication unit and a filtering unit connected thereto; the input side of the isolation communication unit is connected to the signal transceiver terminal of the main control module, and the output side of the isolation communication unit is connected to the signal transceiver terminal of the slave control module.

[0008] Optionally, the PTC heating control device further includes a low-voltage power supply device, which includes a filter module, a first power supply module, a second power supply module, and an isolation power supply module. The filter module is electrically connected between the low-voltage battery and the first power supply module. The first power supply module is electrically connected to the main control module to supply power to the main control module. The isolation power supply module is electrically connected between the first power supply module and the second power supply module. The isolation power supply module is configured to boost the DC voltage from the first power supply module and output it to the second power supply module, providing electrical isolation between the input and output sides. The second power supply module is electrically connected to the slave control module to supply power to the slave control module.

[0009] Optionally, the PTC heating control device further includes a wind heating current detection module and a water heating current detection module electrically connected to the control module. The wind heating current detection module is located in the wind heating circuit, and the water heating current detection module is located in the water heating circuit. The control module collects the current of the wind heating circuit through the wind heating current detection module and the current of the water heating circuit through the water heating current detection module.

[0010] Optionally, the PTC heating control device further includes a high-voltage monitoring module electrically connected to the control module. The air heating circuit and the water heating circuit share a part of the circuit. The high-voltage monitoring module is connected to a non-shared line of the air heating circuit, a non-shared line of the water heating circuit, or a shared part of the circuit of the air heating circuit and the water heating circuit to collect voltage data and transmit it to the control module.

[0011] Optionally, the water heating power control module is mounted on the heating body of the water heating core to dissipate heat through coolant.

[0012] To achieve the above objectives, this utility model embodiment also provides a PTC heating system, including: the PTC heating control device, the air heating actuator, and the water heating actuator as described above, wherein the air heating actuator includes an air heating core located on the air heating circuit, and the water heating actuator includes a water heating core located on the water heating circuit.

[0013] Optionally, the air-heating actuator further includes a first temperature sensor, which is used to detect the real-time temperature of the air-heating core and transmit it to the control module. The water-heating actuator further includes a second temperature sensor, which is used to detect the real-time temperature of the water-heating core and transmit it to the control module.

[0014] In this embodiment, the PTC heating control device utilizes a single control module to control both the air heating power control module and the water heating power control module. Therefore, this embodiment of the PTC heating control device can replace the control modules of the original two PTC heating control devices with a single control module, integrating the two previously independent control modules into one. Furthermore, since there is only one control module, a corresponding communication module is also provided, reducing the number of communication modules compared to the original two PTC heating control devices each having their own. Therefore, this embodiment of the application can reduce the number of components used, which is beneficial for reducing the overall weight, and can also reduce the number of control wiring harnesses used in the vehicle, which is beneficial for the overall vehicle product layout, while also effectively reducing costs. Attached Figure Description

[0015] Figure 1 This is a schematic block diagram of the thermal management control system, PTC heating control device, and heating actuator according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic block diagram of the PTC heating system, low-voltage battery, and thermal management control system according to an embodiment of the present invention.

[0017] Figure 3 This is a circuit diagram of the main control module in an embodiment of the present invention.

[0018] Figure 4 This is a circuit diagram of the control module in an embodiment of the present invention.

[0019] Figure 5 This is a circuit diagram of the isolation communication module according to an embodiment of the present invention.

[0020] Figure 6 This is a circuit diagram of the isolated power supply module according to an embodiment of the present invention.

[0021] Figure 7 This is a circuit diagram of the air heating power control module / water heating power control module according to an embodiment of this utility model. Detailed Implementation

[0022] To explain in detail the technical content, structural features, and effects achieved by this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0023] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0024] Please see Figure 1 and Figure 2 This utility model discloses a PTC heating control device 100, which is mainly used for in-vehicle heating and power battery heating in new energy vehicles.

[0025] The PTC heating control device 100 includes: a control module and a common communication module 101, a fan heating power control module 102, and a water heating power control module 104, which are electrically connected to the control module.

[0026] The control module communicates with the thermal management control system 200 via a common communication module 101. Specifically, the common communication module 101 can be a CAN module.

[0027] The air-heating power control module 102 and the air-heating heating core 401 are located in the air-heating circuit, while the water-heating power control module 104 and the water-heating heating core 501 are located in the water-heating circuit. That is, after the PTC heating control device 100 is connected to the air-heating actuator 400, the water-heating actuator 500, and the high-voltage power supply module (not shown), the air-heating power control module 102 and the air-heating heating core 401 are located in the air-heating circuit, and the water-heating power control module 104 and the water-heating heating core 501 are located in the water-heating circuit.

[0028] The control module is configured to independently control the on / off state of the air heating power control module 102 to make the air heating circuit on or off according to the instructions received through the common communication module 101, thereby controlling the air heating core 401 to heat or stop heating, and independently control the on / off state of the water heating power control module 104 to make the water heating circuit on or off, thereby controlling the water heating core 501 to heat or stop heating.

[0029] In this embodiment, the PTC heating control device 100 utilizes a single control module to control both the air heating power control module 102 and the water heating power control module 104. Therefore, the PTC heating control device 100 of this embodiment can replace the control modules of the original two PTC heating control devices 100 with a single control module, integrating the two originally independent control modules into one (which can be formed on a single circuit board). Furthermore, since there is only one control module, a corresponding common communication module 101 is also provided, reducing the number of communication modules compared to the original two PTC heating control devices 100 each having their own. Therefore, this embodiment can reduce the number of components used, which is beneficial for reducing the overall weight, and can also reduce the number of control wiring harnesses used in the vehicle, which is beneficial for the overall vehicle product layout, while also effectively reducing costs.

[0030] In some embodiments, the control module includes a main control module 106 and a slave control module 107 electrically connected to each other. The main control module 106 is electrically connected to a common communication module 101, and the slave control module 107 is electrically connected to a fan heating power control module 102 and a water heating power control module 104. That is, the main control module 106 is responsible for communicating with the upper-level thermal management control system 200 through the common communication module 101 to obtain control commands from the thermal management control system 200, while the slave control module 107 is directly responsible for information transmission between the fan heating power control module 102 and the water heating power control module 104.

[0031] Please see Figure 3Specifically, the main control module 106 includes a main MCU chip U2, resistor R5, crystal oscillator X1, and capacitors C3-C4; pins 1-3, 10, and 40 of the main MCU chip U2 are grounded to GND; PIN4 processes the signal VCC_LDO_FALSH; PIN5 processes the signal VCC_LDO_CLK; PIN6 processes the signal VCC_LDO_CORE; pins 7-9 and PIN41 are connected to VCC; PIN11 is connected to pin 1 of crystal oscillator X1 and one end of capacitor C3, with the other end of capacitor C3 grounded; PIN12 is connected to one end of resistor R5, with the other end of resistor R5 connected to pin 3 of crystal oscillator X1 and one end of capacitor C4, with the other end of capacitor C4 grounded; pins 2 and 4 of crystal oscillator X1 are both grounded; pins 13-23, PIN27, PIN29, PIN31, PIN35-37, PIN39, and PIN42-43... PINs 45-53, PINs 55-56, and PINs 60-61 are all left floating; PIN 24 handles MLIN_EN, PIN 25 handles MLIN_TX, PIN 26 handles MLIN_RX, PIN 28 handles EDITION1, PIN 30 handles EDITION2, PIN 32 handles MCAN_STB, PIN 33 handles MCAN_TX, PIN 34 handles MCAN_RX, PIN 38 handles LED, PIN 44 handles SLAVE_PWR_EN, PIN 54 handles VBAT_ADC, PIN 57 handles MUART0_TX, PIN 58 handles MUART0_RX, PIN 59 handles MCAN_AWU, PIN 62 handles MDEBUG_SWD_CLK, PIN 63 handles MNRST, and PIN 64 handles MDEBUG_SWD_DIO. Its working principle is as follows: external capacitors C3~C4 correct the resonant frequency and provide a key phase shift, converting the mechanical vibration of the passive crystal oscillator X1 into a precise electrical signal oscillation, thereby providing a basic clock signal to the main MCU chip U2. The main MCU chip U2 monitors and processes the low-voltage signals of each pin according to the clock signal.

[0032] In a specific example, the common communication module 101 is connected to PIN33 and PIN34 of the main MCU chip U2.

[0033] Please see Figure 4Specifically, the control module 107 includes an MCU chip U4, a resistor R18, a crystal oscillator X2, and capacitors C11-C12; pins 1, 10, 12, 18, 20, 22, 26, 29, 39-40, and 43-45 of the MCU chip U4 are left floating; PIN2 processes the signal VDD_LDO_FALSH; PIN3 processes the signal VDD_LDO_CLK; PIN4 processes the signal VDD_LDO_CORE; and PINs 5-11 are also floating. N6 and PIN31 are connected to VDD; PIN7 and PIN30 are grounded (DGND); PIN8 is connected to pin 1 of crystal oscillator X2 and one end of capacitor C11, with the other end of capacitor C11 grounded; PIN9 is connected to one end of resistor R18, with the other end of resistor R18 connected to pin 3 of crystal oscillator X2 and one end of capacitor C12, with the other end of capacitor C12 grounded; pins 2 and 4 of crystal oscillator X2 are both grounded (DGND); PIN11 handles SCP_RST, PIN13 handles SCP_DET, PIN14 handles I_PTC_ADC2, and PIN15 handles I... _PTC_ADC1, PIN16 handles AIR_TEMP_2, PIN17 handles AIR_TEMP_1, PIN19 handles WATER_TEMP_OUT, PIN21 handles WATER_TEMP_IN, PIN23 handles TEMP_IGBT1, PIN24 handles LOCK_OUT, PIN25 handles HIGH_VOLTAGE_ADC, PIN27 handles FAULT_2, PIN28 handles FAULT1, PIN32 handles LED2, PIN33 handles IGBT_CH4, PIN34 handles IGBT_CH3, PIN35 handles IGBT_CH2, PIN36 handles IGBT_CH1, PIN37 handles SLAVE_VCC_ADC, PIN38 handles TEMP_IGBT2, PIN41 handles SUART0_TX, PIN42 handles SUART0_RX, PIN46 handles SDEBUG_SWD_CLK, PIN47 handles SNRST, PIN48 handles SDEBUG_SWD_DIO; Its working principle is as follows: external capacitors C11~C12 convert the mechanical vibration of passive crystal oscillator X2 into precise electrical signal oscillation by correcting the resonant frequency and providing a key phase shift, thereby providing a basic clock signal to MCU chip U4. MCU chip U4 monitors and processes the high voltage signals of each pin according to the clock signal.

[0034] In a specific example, pins 35 and 36 of the MCU chip U4 are connected to the air heating power control module 102 and the water heating power control module 104, respectively. Pins 23 and 38 of the MCU chip U4 are connected to the temperature sensors that detect the temperature of the air heating power control module 102 and the water heating power control module 104, respectively. The temperature sensors can be negative temperature coefficient probes, etc.

[0035] Specifically, an isolation communication module 119 is connected between the main control module 106 and the slave control module 107. The isolation communication module 119 is configured to transmit signals and provide electrical isolation between the main control module 106 and the slave control module 107. The isolation communication module 119 can convert low-voltage communication signals to high-voltage signals.

[0036] More specifically, the isolation communication module 119 includes an isolation communication unit and a filtering unit connected thereto; the input side of the isolation communication unit is connected to the signal transceiver terminal of the main control module 106, and the output side of the isolation communication unit is connected to the signal transceiver terminal of the slave control module 107.

[0037] Please see Figure 5 Furthermore, the isolated communication module 119 includes: an isolated communication chip U1 as an isolated communication unit, a first ferrite bead FB1, a second ferrite bead FB2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, and a second capacitor C2. The first ferrite bead FB1 and the first capacitor C1 form part of the input-side filtering unit, while the second ferrite bead FB2 and the second capacitor C2 form part of the output-side filtering unit. The positive power supply pin VDD1 of the isolated communication chip U1 is connected to one end of the first ferrite bead FB1 and one end of the first capacitor C1. The other end of the first ferrite bead FB1 is connected to the positive power supply ISO_VCC_5V0. The other end of the first capacitor C1 is connected to the input-side ground pin GND1 and ground GND of the isolated communication chip U1. The input-side output pin OUTA of the isolated communication chip U1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the signal receiving pin of the main control module 106 (in a specific example, i.e., ...). Figure 2 (PIN58 of the main MCU chip U2); the input pin INB of the isolated communication chip U1 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the signal transmission pin of the main control module 106 (in the specific example, i.e. Figure 2(PIN57 of the main MCU chip U2); the output positive power supply pin VDD2 of the isolation communication chip U1 is connected to one end of the second ferrite bead FB2 and one end of the second capacitor C2. The other end of the second ferrite bead FB2 is connected to the positive power supply VDD_5V0. The other end of the second capacitor C2 is connected to the output ground pin GND2 and ground DGND of the isolation communication chip U1. The output input pin INA of the isolation communication chip U1 is connected to one end of the second resistor R2. The other end of the second resistor R2 is connected to the signal transmission pin of the control module 107 (in the specific example, i.e. Figure 3 (From PIN41 of MCU chip U4); the output pin of the isolation communication chip U1 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the signal receiving pin of the control module 107 (in the specific example, i.e. Figure 3 (from PIN42 of MCU chip U4).

[0038] It should be noted that the definitions of input side and output side are relative, and input side and output side can also be defined in reverse.

[0039] Specifically, the PTC heating control device 100 also includes a low-voltage power supply device, which includes a filter module 108, a first power module 109, a second power module 110, and an isolation power module 111. The filter module 108 is electrically connected between the low-voltage battery 900 and the first power module 109. The first power module 109 is electrically connected to the main control module 106 to supply power to the main control module 106. The isolation power module 111 is electrically connected between the first power module 109 and the second power module 110. The isolation power module 111 is configured to boost the DC voltage from the first power module 109 and output it to the second power module 110, providing electrical isolation between the input and output sides. The second power module 110 is electrically connected to the slave control module 107 to supply power to the slave control module 107.

[0040] In a specific example, the first power module 109 provides the VCC signal to the corresponding pin of the main MCU chip U2.

[0041] Please see Figure 6More specifically, the isolated power supply module 111 includes a transformer B1, a push-pull chip U3, capacitors C5-C9, diodes D1-D4, an inductor L1, and resistors R6-R9. PIN1 of transformer B1 is connected to the VD2 pin of push-pull chip U3; PIN2 of transformer B1 is connected to the VIN pin of push-pull chip U3 and the power supply ISO_VCC_5V0; PIN3 of transformer B1 is connected to the VD1 pin of push-pull chip U3; PIN5 of transformer B1 is grounded (GND); capacitors C5 and C6 are connected in parallel, one end connected to the power supply ISO_VCC_5V0, and the other end grounded (GND); PIN4 of transformer B1 is connected to the positive terminal of diode D2 and the negative terminal of diode D4; the positive terminal of diode D4 is grounded (DGND), and the negative terminal of diode D2... Connect pin 1 of inductor L1. Connect pin 6 of transformer B1 to the positive terminal of diode D1 and the negative terminal of diode D3. Connect the negative terminal of diode D1 to pin 1 of inductor L1. Connect the positive terminal of diode D3 to ground DGND. Connect capacitor C7 between pin 1 of inductor L1 and ground DGND. Connect capacitor C8 and resistor R6 between pin 2 of inductor L1 and ground. Connect one end of resistor R7 to pin 2 of inductor L1. Connect the other end of resistor R7 to one end of resistor R9 and one end of resistor R8. Connect the other end of resistor R9 to ground DGND. Connect the other end of resistor R8 to one end of capacitor C9. Connect the other end of capacitor C9 to ground DGND.

[0042] Its working principle is as follows: ISO_VCC_5V0 is a 5V DC input from the first power module 109. It passes through the push-pull chip U3, which is a combination of two power amplifier transistors with matched characteristics. Each of the two power amplifier transistors is responsible for amplifying one half-cycle of the input signal, and only one transistor works at a time. The two power amplifier transistors conduct alternately like "pushing" and "pulling", converting the 5V DC power into AC power, thus realizing the inversion. When the two power amplifier transistors are turned on alternately, the current generated acts on the iron core of transformer B1, producing alternating magnetic flux. The alternating magnetic flux passes through the secondary winding, and according to Faraday's law of electromagnetic induction, an AC signal is induced at both ends of the secondary winding of transformer B1. During the positive half-cycle of the AC signal, diodes D1 and D4 are turned on, while diodes D2 and D3 are turned off, resulting in a positive voltage at the top and a negative voltage at the bottom. During the negative half-cycle of the AC signal, diodes D2 and D3 are turned on, while diodes D1 and D4 are turned off, resulting in a positive voltage at the top and a negative voltage at the bottom. This process converts AC to DC, which is the rectification process. Capacitors C5 and C6 filter the input power supply ISO_VCC_5V0. The rectified DC signal is filtered by a π-shaped circuit consisting of capacitors C7 and C8 and inductor L1. Resistor R6 is the load resistor. Resistors R7 and R9 form a voltage divider circuit. The output signal is monitored by detecting the voltage across resistor R9. Resistor R8 limits the current of the corresponding pin input signal of the second power module 110. Capacitor C9 filters the corresponding pin input signal of the second power module 110.

[0043] Please see Figure 7In some embodiments, the fan heating power control module 102 includes: an IGBT driver chip U5, a PMOS Q2, an NMOS Q3, a ferrite bead FB3, diodes D5-D8, resistors R10-R17 and R19-R21, capacitors C10, C13-C18, an IGBT Q1, and terminals CN1-CN2; the VCC pin of the IGBT driver chip U5 is connected to one end of the ferrite bead FB3, one end of capacitor C15, and one end of capacitor C16, the other end of the ferrite bead FB3 is connected to the power supply IGBT_VCC, and the other ends of capacitors C15 and C16 are grounded to DGND; the FLT pin of the IGBT driver chip U5 is connected to one end of resistor R11 and one end of capacitor C17, the other end of resistor R11 is connected to IGBT_FLT1 and one end of capacitor C14, the other end of capacitor C14 is grounded to DGND, and the other end of capacitor C17 is grounded to DGND; the VIN pin of the IGBT driver chip U5 is connected to one end of resistor R13 and the PMOS Q2. The drain (D) of IGBT Q2 is connected to the other end of resistor R13, which is connected to IGBT_CH1. The VREF pin of IGBT driver chip U5 is connected to one end of capacitor C18, one end of resistor R19, and the source (S) of PMOS Q2. The other end of resistor R19 is connected to the gate (G) of PMOS Q2 and the drain (D) of NMOS Q3. The gate of NMOS Q3 is connected to one end of resistor R20 and one end of resistor R21. The other end of resistor R20 is connected to SCP, and the other end of resistor R21 is connected to the source (S) of NMOS Q3 and ground (DGND). The DESAT pin of IGBT driver chip U5 is connected to one end of resistor R10 and one end of capacitor C13. The other end of capacitor C13 is connected to the GND pin of IGBT driver chip U5 and ground (DGND). The other end of resistor R10 is connected to the positive terminal of diode D6, and the negative terminal of diode D6 is connected to the collector (C) of IGBT Q1. The CLAMP pin of IGBT driver chip U5 is connected to one end of resistor R14. The other end of resistor R14 is connected to pin 2 of bidirectional diode D7, one end of resistor R15, and the IGBT. The gate (G) of IGBT Q1 is connected to the other end of resistor R15, which is connected to DGND. Pin 1 of bidirectional diode D7 is connected to pin 2 of bidirectional diode D5, and pin 1 of bidirectional diode D5 is connected to the collector (C) of IGBT Q1. The VO pin of IGBT driver chip U5 is connected to one end of resistor R12 and the negative terminal of diode D8. The other end of resistor R12 is connected to the gate (G) of IGBT Q1. The positive terminal of diode D8 is connected to one end of resistor R16, and the other end of resistor R16 is connected to the gate (G) of IGBT Q1. The collector (C) of IGBT Q1 is connected to one end of capacitor C10, and the other end of capacitor C10 is connected to one end of resistor R17. The other end of resistor R17 is connected to the emitter (E) of IGBT Q1, and then to terminal CN2. The collector (C) of IGBT Q1 is connected to terminal CN1. Terminals CN1 and CN2 are used to connect the fan heating power control module 102 to the fan heating circuit.

[0044] Its working principle is as follows: IGBT_VCC supplies power to the IGBT driver chip U5, and the VREF pin of the IGBT driver chip U5 is powered by 5V from inside the chip as a reference.

[0045] For the enable pin VIN of the IGBT driver chip U5, a low level is active. ① Under normal circumstances, the SCP input is low, PMOS Q2 and NMOS Q3 are both off, and the enable pin VIN is active due to the IGBT_CH1 signal (in this specific example, from PIN36 of the MCU chip U4). When the enable is active and there is no fault, the VO pin of the IGBT driver chip U5 outputs a voltage of about 16V, turning on IGBT Q1, thus completing the circuit and allowing the fan-heated heating element 401 to heat up. When the enable is inactive, IGBT Q1 is off, the circuit is not completed, and the fan-heated heating element 401 stops heating. ② When a short circuit fault occurs, the SCP input signal is high, PMOS Q2 and NMOS Q3 are on, and the enable pin VIN is shorted to the reference VREF pin, keeping the enable pin VIN high and the enable inactive. The fan-heated heating element 401 cannot heat up normally. For the DESAT pin of the IGBT driver chip U5: ① The DESAT pin has an internal current source. After the chip is powered on, it begins to charge the DESAT pin. The threshold voltage of the DESAT pin is 6.5V. When the DESAT pin continues to charge beyond 6.5V, the FLT pin will report an error, causing the SCP signal input to go high, and the fan-heated heating element 401 will stop heating. Therefore, IGBT Q1 needs to turn on before the DESAT pin reaches the threshold voltage of 6.5V to provide a discharge path for the DESAT pin. This is to prevent the IGBT Q1 from being turned on for too long and causing a negative impact on the IGBT Q1 itself; ② When IGBT Q1 is normally turned on, it operates in the saturation region, and Vce is usually only 1~2V. Clamping the voltage of the DESAT pin to VR10+VD+Vce will not trigger the DESAT threshold. When Q1 is short-circuited, it operates in desaturation state, and Vce increases significantly, which in turn causes the voltage VR10+VD+Vce on the DESAT pin to increase significantly, exceeding the threshold of 6.5V. A fault is reported by the FLT pin, and SCP goes high, thereby stopping the heating core 401 from heating.

[0046] For the output pin VO of the IGBT driver chip U5, resistor R12 is the driving resistor for IGBT Q1. When the output pin VO starts to output a high level, the gate (G) of IGBT Q1 is charged through resistor R12. When the output pin VO stops outputting, because the impedance of resistor R12 is smaller than that of the series circuit of resistor R16 and diode D8, the residual charge at the gate of IGBT Q1 is discharged through the circuit of resistor R16 and diode D8. Due to the unidirectional conductivity of diode D8, this series circuit can only be used when IGBT Q1 is turned off, thus achieving the effect of fast turn-off. The CLAMP pin of the IGBT driver chip U5 provides a low-impedance loop for the gate of IGBT Q1, thereby preventing the gate of IGBT Q1 from being mistakenly turned on during the turn-off process; diodes D5 and D7 prevent IGBT Q1 from being damaged by mistakenly turned on due to gate overvoltage or Miller capacitance. Resistor R17 and capacitor C10 are used for filtering between the collector (C) and emitter (E) of IGBT Q1 to suppress voltage spikes between the C and E terminals. Resistor R19 is used for charge discharge between the drain (D) and source (S) of PMOS Q2, and resistor R20 is used for charge discharge between the drain (D) and source (S) of NMOS Q3. The remaining resistors are current-limiting resistors for their respective pins, and the remaining capacitors are filter capacitors.

[0047] The water heating power control module 104 can adopt the same circuit form as the air heating power control module 102, which will not be described in detail here.

[0048] In some embodiments, the water heating power control module 104 is disposed on the heating body (not shown) of the water heating core 501 to dissipate heat through coolant. Specifically, the heating body removes the heat generated by the water heating power control module 104 during operation through the flow of coolant, so that the operating temperature of the water heating power control module 104 does not exceed 120°C, which is beneficial to improving the service life of the water heating power control module 104.

[0049] In some embodiments, the PTC heating control device further includes a fan heating current detection module 103 electrically connected to the control module. The fan heating current detection module 103 is located in the fan heating circuit, and the control module collects the current of the fan heating circuit through the fan heating current detection module 103. Based on the setting of the fan heating current detection module 103, the magnitude of the current when the fan heating core 401 is working can be detected, and power control and short circuit monitoring can be performed accordingly.

[0050] Specifically, the air heating current detection module 103 is electrically connected to the slave control module 107.

[0051] In a specific example, PIN14 of the MCU chip U4 is connected to the heating current detection module 103.

[0052] In some embodiments, the PTC heating control device further includes a water heating current detection module 105 electrically connected to the control module. The water heating current detection module 105 is located in the water heating circuit, and the control module collects the current of the water heating circuit through the water heating current detection module 105. Based on the setting of the water heating current detection module 105, the magnitude of the current when the water heating core 501 is working can be detected, and power control and short circuit monitoring can be performed accordingly.

[0053] Specifically, the water heating current detection module 105 is electrically connected to the slave control module 107.

[0054] In a specific example, PIN15 of the MCU chip U4 is connected to the water heating current detection module 105. In some embodiments, the PTC heating control device 100 further includes a high-voltage monitoring module 112 electrically connected to the control module. The air heating circuit and the water heating circuit share a common section of wiring. The high-voltage monitoring module 112 is connected to a non-common section of the air heating circuit, a non-common section of the water heating circuit, or a common section of the air heating circuit and the water heating circuit to collect voltage data and transmit it to the control module. By detecting the high voltage through the high-voltage monitoring module 112, the control module can perform control based on the collected voltage data.

[0055] Specifically, the high-voltage monitoring module 112 is connected to the slave control module 107.

[0056] In a specific example, the high-voltage monitoring module is connected to PIN25 of the MUC chip U4.

[0057] In some embodiments, the PTC heating control device 100 further includes a pre-charge module 113 and a filter module 114 disposed on a high-voltage power supply line.

[0058] Please combine Figure 1 and Figure 2 This application also discloses a PTC heating system, including: a PTC heating control device 100 as described above, a fan heating actuator 400 and a water heating actuator 500, wherein the fan heating actuator 400 includes a fan heating core 401 located on the fan heating circuit, and the water heating actuator 500 includes a water heating core 501 located on the water heating circuit.

[0059] In this embodiment, the PTC heating control device 100 utilizes a single control module to control both the air heating power control module 102 and the water heating power control module 104. Therefore, the PTC heating control device 100 of this embodiment can replace the control modules of the original two PTC heating control devices 100 with a single control module, integrating the two previously independent control modules into one. Furthermore, since there is only one control module, a corresponding communication module 101 is also provided, reducing the number of communication modules compared to the original two PTC heating control devices 100 each having their own. Therefore, this embodiment can reduce the number of components used, which is beneficial for reducing the overall weight, and can also reduce the number of control wiring harnesses used in the vehicle, which is beneficial for the overall vehicle product layout, while also effectively reducing costs.

[0060] In some embodiments, the fan-heated actuator 400 further includes a first temperature sensor 402, which detects the real-time temperature of the fan-heated core 401 and transmits it to the control module. The water-heated actuator 500 further includes a second temperature sensor 502, which detects the real-time temperature of the water-heated core 501 and transmits it to the control module. By using the first temperature sensor 402 to detect the temperature of the fan-heated core 401 and the second temperature sensor 502 to detect the temperature of the water-heated chip 501, it is possible to prevent the temperature from becoming too high due to continuous heating.

[0061] Specifically, the first temperature sensor 402 and the second temperature sensor 502 are connected to the control module 107.

[0062] In a specific example, there are two of each of the first temperature sensor 402 and the second temperature sensor 502, which are connected to PIN16, PIN17, PIN19, and PIN21 of the MCU chip U4, respectively.

[0063] In some embodiments, the PTC heating system further includes a high-voltage connector 300, the lines of the air heating power control module 102 and the water heating power control module 104 are connected to the high-voltage connector 300 and connected to an external high-voltage power supply module through the high-voltage connector 300 to establish an air heating circuit and a water heating circuit.

[0064] The above-disclosed examples are merely preferred embodiments of the present utility model, intended to facilitate understanding and implementation by those skilled in the art. They should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model are still within the scope of the present utility model.

Claims

1. A PTC heating control device, characterized in that, include: The control module, and a common communication module, a fan heating power control module, and a water heating power control module electrically connected to the control module; The control module is connected to the thermal management control system through the common communication module. The air heating power control module and the air heating core are located in the air heating circuit, and the water heating power control module and the water heating core are located in the water heating circuit. The control module is configured to independently control the on / off state of the air heating power control module to turn the air heating circuit on or off, and to independently control the on / off state of the water heating power control module to turn the water heating circuit on or off, based on instructions received through the common communication module.

2. The PTC heating control device as described in claim 1, characterized in that, The control module includes a main control module and a slave control module that are electrically connected to each other. The main control module is electrically connected to the common communication module, and the slave control module is electrically connected to the air heating power control module and the water heating power control module.

3. The PTC heating control device as described in claim 2, characterized in that, An isolation communication module is connected between the main control module and the slave control module; the isolation communication module is configured to transmit signals and provide electrical isolation between the main control module and the slave control module.

4. The PTC heating control device as described in claim 3, characterized in that, The isolated communication module includes an isolated communication unit and a filtering unit connected thereto; the input side of the isolated communication unit is connected to the signal transceiver terminal of the main control module, and the output side of the isolated communication unit is connected to the signal transceiver terminal of the slave control module.

5. The PTC heating control device as described in claim 2, characterized in that, It also includes a low-voltage power supply device, which includes a filter module, a first power module, a second power module, and an isolation power module. The filter module is electrically connected between the low-voltage battery and the first power module. The first power module is electrically connected to the main control module to supply power to the main control module. The isolation power module is electrically connected between the first power module and the second power module. The isolation power module is configured to boost the DC voltage from the first power module and output it to the second power module, providing electrical isolation between the input and output sides. The second power module is electrically connected to the slave control module to supply power to the slave control module.

6. The PTC heating control device as described in claim 1, characterized in that, It also includes a wind heating current detection module and a water heating current detection module that are electrically connected to the control module. The wind heating current detection module is located in the wind heating circuit, and the water heating current detection module is located in the water heating circuit. The control module collects the current of the wind heating circuit through the wind heating current detection module and the current of the water heating circuit through the water heating current detection module.

7. The PTC heating control device as described in claim 1, characterized in that, It also includes a high-voltage monitoring module electrically connected to the control module. The air heating circuit and the water heating circuit share a part of the circuit. The high-voltage monitoring module is connected to a non-shared line of the air heating circuit, a non-shared line of the water heating circuit, or a shared part of the circuit of the air heating circuit and the water heating circuit to collect voltage data and transmit it to the control module.

8. The PTC heating control device as described in claim 1, characterized in that, The water heating power control module is installed on the heating body of the water heating core to dissipate heat through coolant.

9. A PTC heating system, characterized in that, include: The PTC heating control device, the air heating actuator, and the water heating actuator as described in any one of claims 1 to 8, wherein the air heating actuator includes an air heating core located on the air heating circuit, and the water heating actuator includes a water heating core located on the water heating circuit.

10. The PTC heating system as described in claim 9, characterized in that, The air-heating actuator further includes a first temperature sensor, which is used to detect the real-time temperature of the air-heating core and transmit it to the control module. The water-heating actuator further includes a second temperature sensor, which is used to detect the real-time temperature of the water-heating core and transmit it to the control module.

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