Compressor integrated with PTC control

Abstract

The utility model discloses a compressor integrated with PTC control, and belongs to the technical field of compressors. A compressor integrated with PTC control comprises a heater connector and a controller. The controller is electrically connected and conducted with the compressor to control starting and stopping of the compressor; the controller is electrically connected and conducted with the heater through the heater connector so as to control the on and off of the heater; the controller comprises a low-voltage part and a high-voltage part; the low-voltage part comprises a low-voltage power supply circuit and a communication circuit; the high-voltage part comprises a compressor driving circuit, a PTC heater driving circuit and a main control circuit; the output end of the low-voltage power supply circuit and the output end of the communication circuit are electrically connected and conducted with the input end of the main control circuit. The output end of the main control circuit is electrically connected and conducted with the input end of the compressor drive circuit and the input end of the PTC heater drive circuit. And the main control circuit receives an external instruction received by the communication circuit and transmits the external instruction to the compressor driving circuit and the PTC heater driving circuit respectively, so that starting and stopping of the compressor and the heater are synchronously controlled.

Description

TECHNICAL FIELD

[0001] The utility model belongs to compressor technical field, more specifically, relate to a kind of compressor of integration PTC control. BACKGROUND

[0002] Electric compressor as important component of new energy vehicle, has very important function;As the core component of new energy vehicle air conditioning system, electric compressor plays an irreplaceable role;The performance, vibration noise, reliability, sealing of electric compressor, etc. are important factors affecting its work;Now general compressor uses the controller scheme of pure control compressor itself, and has not integrated the control part of heater heating, resulting in in heating environment, energy loss is serious, affect vehicle power efficiency and affect customer experience. INVENTION CONTENTS

[0003] The utility model provides a kind of compressor of integration PTC control, it can realize the opening and closing of synchronous control compressor and heater.

[0004] The utility model discloses a kind of compressor of integration PTC control, including compressor body, PTC heater and control component, control component is used to synchronous control compressor body and PTC heater;Controller and compressor electric connection conduction, to control the opening and closing of compressor;Controller is electrically connected with heater by heater connector and conduction, to control the opening and closing of heater;

[0005] Controller includes low-voltage part and high-voltage part;Low-voltage part includes low-voltage power supply circuit and communication circuit;High-voltage part includes compressor drive circuit, PTC heater drive circuit and main control circuit;The output of low-voltage power supply circuit and communication circuit is electrically connected with the input of main control circuit conduction, the output of main control circuit is respectively electrically connected with the input of compressor drive circuit and PTC heater drive circuit conduction, and low-voltage power supply circuit provides power supply for controller;Compressor drive circuit controls the opening and closing of compressor, PTC heater drive circuit controls the opening and closing of heater, and main control circuit receives external instruction received by communication circuit and is respectively transmitted to compressor drive circuit and PTC heater drive circuit, to control the opening and closing of compressor and heater synchronously.

[0006] As the further improvement of the utility model, the input of low-voltage power supply circuit is electrically connected with the power supply of external setting conduction, and external power supply is powered for low-voltage power supply circuit;Low-voltage power supply circuit is responsible for converting external power supply into stable low-voltage, and provides power supply for main control circuit, compressor drive circuit and PTC heater drive circuit;

[0007] Communication circuit is connected with the communication bus of external setting to receive external instruction.

[0008] As a further improvement of the utility model, the main control circuit comprises a micro control unit, the micro control unit is a central control unit, integrates external instructions and internal feedback, and generates a control signal; the compressor driving circuit and the PTC heater driving circuit control the opening and closing of the compressor and the heater respectively through the control signal of the micro control unit.

[0009] As a further improvement of the utility model, the low-voltage power supply circuit comprises an AC / DC conversion circuit and an isolation circuit; the AC / DC conversion circuit is used for converting an external input voltage into a low-voltage direct current required by the system; and the isolation circuit is used for electrically isolating the low-voltage side.

[0010] As a further improvement of the utility model, the communication circuit comprises a communication transceiver, and the controller receives a signal from a communication bus through the communication transceiver and safely transmits the signal of the communication bus to the main control circuit.

[0011] As a further improvement of the utility model, the communication circuit further comprises a signal isolation circuit, and the signal isolation circuit is used for electrically isolating the communication signal of the communication bus from other circuits.

[0012] As a further improvement of the utility model, the compressor driving circuit comprises a three-phase driving circuit, and a power tube of an upper bridge arm and a lower bridge arm is arranged on each phase circuit;

[0013] The power tube comprises six power switches, corresponding gate drives are arranged on the loop of the power switches; a pulse width modulation signal generated by the micro control unit is transmitted to the power switches of the three-phase driving circuit through the gate drives, and the power switches control direct current to be converted into three-phase alternating current and output to the compressor.

[0014] As a further improvement of the utility model, the main control circuit is further provided with a protection mechanism; an overcurrent detection and protection circuit is arranged in the output loop of the three-phase driving circuit; the overcurrent detection and protection circuit comprises a shunt resistor and an operational amplifier; three-phase currents are collected through the shunt resistor, the current signals are amplified through the operational amplifier, and then transmitted to the main control circuit;

[0015] When the current exceeds a set threshold, the main control circuit reduces or stops the pulse width modulation signal output through the protection mechanism, and triggers the overcurrent protection.

[0016] As a further improvement of the utility model, the PTC heater driving circuit is provided with a current sensor and a temperature sensor; the current and temperature of the heater are monitored through the current sensor and the temperature sensor, the current and temperature information collected by the current sensor and the temperature sensor are fed back to the main control circuit, the main control circuit adjusts the control signal according to the collected data, and overcurrent and overheating are prevented.

[0017] As a further improvement of the utility model, the controller further comprises a high-voltage connector, a high-voltage interlocking circuit and a high-voltage interface circuit, the high-voltage interface circuit is connected with an external power supply through the high-voltage connector; the high-voltage interlocking circuit is used for detecting the access state of the high-voltage connector in real time.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] The synchronous control of the compressor and the heater is realized through the joint control of the main control circuit, the PTC heater driving circuit and the compressor driving circuit; external instructions are received through the communication circuit, and control signals are generated through the main control circuit, so that the start and stop of the compressor and the heater are accurately controlled at the same time, the energy efficiency of the system is maximized, and the power efficiency of the whole vehicle is improved.

[0020] The heater control part is integrated into the compressor control assembly, thereby avoiding the problem of high energy loss and system complexity caused by the independent control of the compressor and the heater in the traditional scheme; through the unified controller scheme, the additional control module and circuit design are reduced, the system design is more simple, and the energy management of the whole vehicle can be effectively optimized.

[0021] Through the modular design, the controller is internally divided into a low-voltage part and a high-voltage part, and the high-voltage interface part is provided with a high-voltage connector and a high-voltage interface circuit, thereby simplifying the connection process of the external power supply. Through the high-voltage interlocking circuit, the safety of the high-voltage power supply during access and use is ensured, and the convenience and maintainability of the system in actual application are improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 It is an explosion structure schematic view of the control assembly of the utility model;

[0023] Fig. 2 It is a controller circuit structure schematic view of the utility model.

[0024] Explanation of reference numerals in the drawing:

[0025] 1, heater connector; 2, low-voltage part; 21, low-voltage power supply circuit; 22, communication circuit; 3, high-voltage part; 31, main control circuit; 32, compressor driving circuit; 33, PTC heater driving circuit. DETAILED DESCRIPTION

[0026] The utility model will be further explained in detail in combination with examples, and the following examples are an explanation of the utility model, and the utility model is not limited to the following examples.

[0027] Specific example one: please refer to Figs. 1-2The application discloses a compressor integrated with a PTC control, which comprises a compressor body, a PTC heater and a control assembly for synchronously controlling the compressor body and the PTC heater; the control assembly comprises a heater connector 11 and a controller; the controller is electrically connected with the compressor to control the start and stop of the compressor; the controller is electrically connected with the heater through the heater connector 1 to control the start and stop of the heater.

[0028] The controller comprises a low-voltage part 2 and a high-voltage part 3; the low-voltage part 2 comprises a low-voltage power supply circuit 21 and a communication circuit 22; the high-voltage part 3 comprises a compressor driving circuit 32, a PTC heater driving circuit 33 and a main control circuit 31; the output ends of the low-voltage power supply circuit 21 and the communication circuit 22 are electrically connected with the input end of the main control circuit 31, the output end of the main control circuit 31 is electrically connected with the input ends of the compressor driving circuit 32 and the PTC heater driving circuit 33 respectively, and the low-voltage power supply circuit 21 provides power supply for the controller; the compressor driving circuit 32 controls the start and stop of the compressor, the PTC heater driving circuit 33 controls the start and stop of the heater, and the main control circuit 31 receives external instructions received by the communication circuit 22 and transmits the external instructions to the compressor driving circuit 32 and the PTC heater driving circuit 33 respectively, so as to synchronously control the start and stop of the compressor and the heater.

[0029] The input end of the low-voltage power supply circuit 21 is electrically connected with an externally arranged power supply, the external power supply supplies power for the low-voltage power supply circuit 21, and the low-voltage power supply circuit 21 is responsible for converting external power supply into stable low-voltage to provide power supply for the main control circuit 31, the compressor driving circuit 32 and the PTC heater driving circuit 33.

[0030] The communication circuit 22 is connected with an externally arranged communication bus to receive external instructions.

[0031] Optionally, the externally arranged power supply is a vehicle-mounted power supply, and the externally arranged communication bus is a vehicle-mounted communication bus.

[0032] The main control circuit 31 receives power supply from the low-voltage power supply circuit 21 and external instructions from the communication circuit 22, processes the external instructions in combination with internally collected feedback (such as current, voltage, temperature and the like), generates control signals by using a control algorithm (such as FOC, SVPWM and the like), and outputs the control signals to the compressor driving circuit 32 and the PTC heater driving circuit 33 respectively; meanwhile, the system state is detected in real time, fault diagnosis is performed, and protection measures (such as overcurrent protection, temperature protection and the like) are started.

[0033] The main control circuit 31 comprises a micro control unit, which is a central control unit, integrates external instructions and internal feedback, and generates control signals; the compressor driving circuit 32 and the PTC heater driving circuit 33 are controlled by the control signals of the micro control unit to control the start and stop of the compressor and the heater respectively; the main control circuit 31 coordinates the work of the whole system and ensures the collaborative operation of the compressor and the heater.

[0034] Optionally, the control signal is a pulse width modulation (PWM) signal or a switching signal.

[0035] Preferably, the heater is a PTC heater.

[0036] The control assembly further comprises a low-voltage connector, and the low-voltage power supply circuit 21 is electrically connected to an external power supply through the low-voltage connector.

[0037] The low-voltage power supply circuit 21 comprises an AC / DC conversion circuit and an isolation circuit; after an external power supply is input, the AC / DC conversion circuit converts the voltage into a low-voltage direct current required by the system; the isolation circuit is used for electrically isolating the low-voltage side to protect the low-voltage control part from interference from the high-voltage side.

[0038] The low-voltage part 2 further comprises a low-dropout regulator; the isolation circuit comprises a transformer, and the transformer is used for electrical isolation and voltage reduction, and then the low-dropout regulator is used for voltage stabilization to output a low-voltage power supply required by the high-voltage part 3.

[0039] The communication circuit 22 comprises a communication transceiver, and the controller receives signals from a vehicle-mounted communication bus through the communication transceiver and safely transmits the signals of the communication bus to the main control circuit 31.

[0040] The communication circuit 22 further comprises a signal isolation circuit, which is used for electrically isolating the communication signals of the communication bus from other circuits; the signal isolation circuit ensures that possible interference and surges on the high-voltage side cannot be transmitted to the main control circuit 31 through the communication interface, thereby guaranteeing the reliability and safety of data transmission.

[0041] The compressor driving circuit 32 comprises a three-phase driving circuit (U / V / W), each phase (U, V, W) is provided with power tubes of upper and lower bridge arms, and inverter output is realized through pulse width modulation (PWM) control.

[0042] The power tubes comprise six power switches, and corresponding gate drives are arranged on the loops of the power switches; the pulse width modulation (PWM) signals generated by the micro control unit are transmitted to the power switches of the three-phase driving circuit through the gate drives, and the power switches control the conversion of direct current into three-phase alternating current and output the three-phase alternating current to the compressor;

[0043] The three-phase driving circuit is directly connected with an externally arranged high-voltage bus (HV+, HV-) to output a high-voltage power supply for the compressor.

[0044] Optionally, the power switch of the compressor driving circuit 32 is a MOSFET or an IGBT.

[0045] An overcurrent detection and protection circuit is arranged in the output loop of the three-phase driving circuit; the overcurrent detection and protection circuit comprises a shunt resistor and an operational amplifier; the three-phase current is collected through the shunt resistor, the current signal is sent to the operational amplifier for amplification, and finally transmitted to the main control circuit 31.

[0046] The main control circuit 31 is also provided with a protection mechanism; the main control circuit 31 monitors the current feedback signal in real time, optimizes the running state of the motor by adjusting the pulse width modulation (PWM) duty cycle; when the current exceeds the set threshold, the main control circuit 31 reduces or stops the pulse width modulation (PWM) signal output through the protection mechanism, triggering the overcurrent protection.

[0047] Optionally, the overcurrent detection and protection circuit further comprises a bus voltage detection, a motor winding temperature detection and the like sensor interface.

[0048] The PTC heater driving circuit 33 is driven by the control signal from the micro control unit, drives the power switch (MOSFET, etc.) arranged in the PTC heater driving circuit 33, adjusts the current of the heater, and realizes heating.

[0049] The PTC heater driving circuit 33 is provided with a current sensor and a temperature sensor, which simultaneously monitor the current and temperature of the heater, and the collected current and temperature information is fed back to the main control circuit 31, and the main control circuit 31 adjusts the control signal according to the collected data to prevent overcurrent and overheating.

[0050] The controller further comprises a high-voltage connector, a high-voltage interlocking circuit and a high-voltage interface circuit, the high-voltage interface circuit is connected with the external power supply through the high-voltage connector, ensuring the reliability of mechanical and electrical connection; the high-voltage interlocking circuit is used for real-time detection of the access state of the high-voltage connector, ensuring that the system can only run when correctly connected;

[0051] When it is detected that the high-voltage connection is poor or loose, the interlocking circuit feeds back a disconnection signal to the micro control unit, and the micro control unit controls the three-phase driving module to disconnect the high-voltage output, protecting the safety of the system.

[0052] Working mode:

[0053] After the low-voltage part 2 is powered on, the AC / DC circuit starts to work, providing power supply for the micro control unit and the communication circuit.

[0054] The micro control unit is powered on for self-checking, and performs handshake or parameter initialization with the host computer such as vehicle-mounted ECU through the communication bus.

[0055] When receiving the start / operation command, the micro control unit calculates the required pulse width modulation (PWM) (such as SVPWM or FOC algorithm) and outputs to the U / V / W three-phase drive circuit.

[0056] The power switch is turned on and off according to the pulse width modulation (PWM) duty cycle, and the high voltage bus power is inverted into three-phase alternating current to drive the motor to rotate.

[0057] The overcurrent detection and protection circuit continuously monitors the current, and protection is performed if the threshold is exceeded.

[0058] The micro control unit controls the PTC heater drive circuit 33 according to the temperature requirement or external instruction to power on the heater.

[0059] The positive temperature coefficient characteristic of the PTC heater causes its resistance to rise after the temperature rises, automatically limiting the current.

[0060] The micro control unit can dynamically adjust the heating power according to the temperature sensor or current feedback, or turn off the heating at high temperature; if abnormal conditions such as overcurrent, overvoltage, short circuit, and overtemperature are monitored, the system will immediately enter the protection mode:

[0061] The micro control unit quickly turns off the three-phase drive or PTC drive;

[0062] Record fault information and notify the host computer through the communication bus;

[0063] Wait for manual intervention or automatically restart as appropriate.

[0064] The communication circuit 22 realizes the bidirectional communication between the host (such as the vehicle-mounted ECU) and the controller, including start, speed, fault diagnosis, and other instructions.

[0065] The micro control unit realizes motor torque control, PTC temperature control, and fault management through comprehensive processing of sensors and drive signals.

[0066] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this; any person skilled in the art within the technical scope disclosed in the present application, according to the technical solution and its improvement concept of the present application, equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A compressor integrated with PTC control, comprising a compressor body, a PTC heater and a control assembly for synchronously controlling the compressor body and the PTC heater, characterized in that: The control assembly comprises a heater connector (1) and a controller; the controller is electrically connected to the compressor to control the start and stop of the compressor; the controller is electrically connected to the heater through the heater connector (1) to control the start and stop of the heater. The controller comprises a low-voltage part (2) and a high-voltage part (3); the low-voltage part (2) comprises a low-voltage power supply circuit (21) and a communication circuit (22); the high-voltage part (3) comprises a compressor driving circuit (32), a PTC heater driving circuit (33) and a main control circuit (31); the output terminals of the low-voltage power supply circuit (21) and the communication circuit (22) are electrically connected to the input terminal of the main control circuit (31), the output terminal of the main control circuit (31) is electrically connected to the input terminals of the compressor driving circuit (32) and the PTC heater driving circuit (33) respectively, and the low-voltage power supply circuit (21) provides power supply for the controller; the compressor driving circuit (32) controls the start and stop of the compressor, the PTC heater driving circuit (33) controls the start and stop of the heater, and the main control circuit (31) receives external instructions received by the communication circuit (22) and transmits them to the compressor driving circuit (32) and the PTC heater driving circuit (33) respectively, thereby synchronously controlling the start and stop of the compressor and the heater.

2. The compressor with integrated PTC control of claim 1, wherein: The input terminal of the low-voltage power supply circuit (21) is electrically connected to an externally provided power supply, and the external power supply supplies power to the low-voltage power supply circuit (21); the low-voltage power supply circuit (21) is responsible for converting external power supply into stable low-voltage to provide power supply for the main control circuit (31), the compressor driving circuit (32) and the PTC heater driving circuit (33); The communication circuit (22) is connected to an externally provided communication bus to receive external instructions.

3. The compressor with integrated PTC control of claim 2, wherein: The main control circuit (31) comprises a micro control unit, which is a central control unit, integrates external instructions and internal feedback, and generates control signals; the compressor driving circuit (32) and the PTC heater driving circuit (33) control the start and stop of the compressor and the heater respectively through the control signals of the micro control unit.

4. The compressor with integrated PTC control of claim 1, wherein: The low-voltage power supply circuit (21) comprises an AC / DC conversion circuit and an isolation circuit; the AC / DC conversion circuit is used to convert external input voltage into low-voltage direct current required by the system; and the isolation circuit is used to electrically isolate the low-voltage side.

5. The PTC integrated compressor of claim 1, wherein: The communication circuit (22) comprises a communication transceiver, and the controller receives signals from the communication bus through the communication transceiver and safely transmits the signals of the communication bus to the main control circuit (31).

6. The PTC integrated compressor of claim 1, wherein: The communication circuit (22) further comprises a signal isolation circuit, which is used to electrically isolate the communication signals of the communication bus from other circuits.

7. The PTC integrated compressor of claim 1, wherein: The compressor driving circuit (32) comprises a three-phase driving circuit, and power tubes of upper and lower bridge arms are arranged on each phase circuit; The power tubes comprise six power switches, and corresponding gate drives are arranged on the loops of the power switches; the pulse width modulation signals generated by the micro control unit are transmitted to the power switches of the three-phase driving circuit through the gate drives, and the power switches control the conversion of direct current into three-phase alternating current and output to the compressor.

8. The PTC integrated compressor according to claim 7, wherein: The main control circuit (31) is also provided with a protection mechanism; an overcurrent detection and protection circuit is arranged in the output loop of the three-phase drive circuit; the overcurrent detection and protection circuit comprises a shunt resistor and an operational amplifier; three-phase currents are collected through the shunt resistor, the current signals are amplified through the operational amplifier, and then transmitted to the main control circuit (31); When the current exceeds the set threshold, the main control circuit (31) reduces or stops the output of the pulse width modulation signal through the protection mechanism, triggering the overcurrent protection.

9. The PTC integrated compressor of claim 1, wherein: The PTC heater drive circuit (33) is provided with a current sensor and a temperature sensor; the current and temperature of the heater are monitored through the current sensor and the temperature sensor, and the current and temperature information collected by the current sensor and the temperature sensor is fed back to the main control circuit (31), and the main control circuit (31) adjusts the control signal according to the collected data to prevent overcurrent and overheating.

10. The compressor with integrated PTC control of claim 1, wherein: The controller further comprises a high-voltage connector, a high-voltage interlocking circuit and a high-voltage interface circuit, the high-voltage interface circuit is connected with an external power supply through the high-voltage connector; the high-voltage interlocking circuit is used for detecting the access state of the high-voltage connector in real time.

Images