CN116169645A - Intelligent power module - Google Patents

Intelligent power module Download PDF

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Publication number
CN116169645A
CN116169645A CN202310098536.0A CN202310098536A CN116169645A CN 116169645 A CN116169645 A CN 116169645A CN 202310098536 A CN202310098536 A CN 202310098536A CN 116169645 A CN116169645 A CN 116169645A
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China
Prior art keywords
circuit
control circuit
fpc
voltage
output
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CN202310098536.0A
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Inventor
冯宇翔
张土明
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Guangdong Huixin Semiconductor Co Ltd
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Guangdong Huixin Semiconductor Co Ltd
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Priority to CN202310098536.0A priority Critical patent/CN116169645A/en
Publication of CN116169645A publication Critical patent/CN116169645A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H02H5/044—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a semiconductor device to sense the temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H02H5/047—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Automation & Control Theory (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The invention provides an intelligent power module, which comprises a high-voltage integrated circuit and a thermistor with a negative temperature coefficient, wherein the high-voltage integrated circuit is connected with the thermistor; the high-voltage integrated circuit comprises a driving circuit for receiving driving signals, an inverter connected with the driving circuit, an FPC control circuit for receiving FPC control signals, an FPC switching tube unit connected with the FPC control circuit and a temperature control circuit; the temperature control circuit is used for controlling the output of the FPC control circuit when the temperature detected by the thermistor reaches a preset high temperature threshold value so as to realize the power device shutdown; and the power device is also used for controlling the output of the FPC control circuit when the temperature detected by the thermistor is smaller than a preset low-temperature threshold value so as to realize starting and keep the normal operation of the power device. Compared with the related art, the technical scheme of the invention can effectively prevent the working performance of the intelligent power module from being reduced and has high reliability caused by high working temperature of the FPC.

Description

Intelligent power module
Technical Field
The invention relates to the technical field of electronic circuits, in particular to an intelligent power module.
Background
The high voltage integrated circuit, HVIC (High Voltage Integrated Circuit), is an integrated circuit product for converting MCU signals into drive signals for driving switching transistors such as IGBTs. In general, a high-voltage integrated circuit integrates various switching transistors, diodes, voltage-stabilizing transistors, resistors, capacitors, and other basic devices to form a driving circuit, a pulse generating circuit, a delay circuit, a filter circuit, an overcurrent protection circuit, an overheat protection circuit, an undervoltage protection circuit, a bootstrap circuit, and the like. When the high-voltage integrated circuit works, on one hand, the control signal of the external processor is received to drive the subsequent switching tube to work, and on the other hand, the related working state detection signal is also sent back to the external processor to realize the control of the working condition of the circuit. The high voltage integrated circuit also integrates a PFC drive module PFC (Power Factor Correction) meaning "power factor correction", which is typically used with three-phase inverter motors.
In the related art, the PFC driving module generally adopts an active PFC driving module or one of the PFC driving modules is a passive PFC driving module. The PFC driving module is a circuit device for realizing high energy efficiency and low loss, along with popularization of intellectualization and miniaturization, high frequency and high speed are trends of development of the power module, the PFC driving module needs higher frequency speed, the power module of the driving module generates heat greatly due to high frequency, if the heat dissipation effect of a product is poor, the reliability of the product is easily affected, and a device can be damaged seriously. How to avoid the intelligent power module from excessively high module temperature caused by PFC high-frequency switch, and to reduce module current capacity, and to improve reliability.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the intelligent power module which can effectively prevent the working performance of the intelligent power module from being reduced and has high reliability caused by high working temperature of the FPC.
To achieve the purpose, the invention adopts the following technical scheme:
the invention provides an intelligent power module, which comprises a high-voltage integrated circuit, a power supply circuit and a power supply circuit, wherein the high-voltage integrated circuit is used for receiving a driving signal and an FPC control signal which are respectively output by an external processor; the high-voltage integrated circuit comprises a driving circuit for receiving the driving signal, an inverter connected with the driving circuit, an FPC control circuit for receiving the FPC control signal and an FPC switching tube unit connected with the FPC control circuit, wherein the driving circuit is used for driving the inverter according to the driving signal, and the inverter is used for driving external terminal equipment; the FPC control circuit is used for controlling the output of the FPC switching tube unit according to the FPC control signal, and the FPC switching tube unit is used for driving an external power device;
the intelligent power module further comprises a thermistor with a negative temperature coefficient, and the high-voltage integrated circuit further comprises a temperature control circuit; the first end of the thermistor is connected to the input end of the temperature control circuit, and the second end of the thermistor is grounded; a first output end of the temperature control circuit is connected to an input end of the FPC control circuit;
the temperature control circuit is used for controlling the output of the FPC control circuit when the temperature detected by the thermistor reaches a preset high temperature threshold value so as to realize the shutdown of the power device; and the power device is also used for controlling the output of the FPC control circuit when the temperature detected by the thermistor is smaller than a preset low-temperature threshold value so as to realize starting and keep the normal operation of the power device.
Further, the temperature control circuit comprises a voltage division comparison unit and an output signal control unit which are connected in sequence,
the input end of the voltage division comparison unit is used as the input end of the temperature control circuit and is used for judging whether the voltage corresponding to the temperature detected by the thermistor reaches a high voltage corresponding to a preset high temperature threshold or a low value voltage corresponding to a low temperature threshold;
the first output end of the output signal control unit is used as the first output end of the temperature control circuit and is used for generating high voltage or low voltage for driving the FPC control circuit according to the output of the voltage division comparison unit.
Further, the second output end of the output signal control unit is used as the second output end of the temperature control circuit, and the second output end of the temperature control circuit is used for being connected with the external processor, so that the processor stops or keeps outputting the driving signal and the FPC control signal after obtaining the temperature condition detected by the thermistor.
Further, the voltage division comparison unit comprises a resistor, a capacitor and a comparator; the output signal control unit comprises an inverter, a transistor and a diode; the transistor is an NMOS (N-channel metal oxide semiconductor) transistor;
the positive input end of the comparator is used as the input end of the temperature control circuit, and is respectively connected to the second end of the resistor and the first end of the capacitor; a first end of the resistor is connected to a power supply voltage; the second end of the capacitor is grounded;
the negative input end of the comparator is connected to a reference voltage;
the output end of the comparator is connected to the input end of the inverter;
the output end of the inverter is used as a second output end of the temperature control circuit, and the output end of the inverter is connected to the grid electrode of the transistor;
the source electrode of the transistor is grounded; the positive electrode of the diode is grounded;
the drain of the transistor is used as a first output end of the temperature control circuit, and the drain of the transistor is connected to the cathode end of the diode.
Further, the FPC control circuit comprises a compact trigger, a filter circuit, a potential displacement circuit, a pulse generation circuit and a delay circuit which are connected in sequence.
Further, the high-voltage integrated circuit further comprises an undervoltage protection circuit, an overcurrent protection circuit, a short-circuit protection circuit, an enabling circuit and a fault logic control circuit;
the output end of the undervoltage protection circuit is connected to the first input end of the fault logic control circuit;
the output end of the overcurrent protection circuit is connected to the second input end of the fault logic control circuit;
the output end of the short-circuit protection circuit is connected to the third input end of the fault logic control circuit;
the second output end of the temperature control circuit is connected to the fourth input end of the fault logic control circuit;
the output end of the FPC control circuit is also connected to the fifth input end of the fault logic control circuit;
the input end of the enabling circuit is connected to the first input end of the fault logic control circuit, and the output end of the enabling circuit is used for being connected with an external processor;
the second input terminal of the fault logic control circuit is connected to the control terminal of the driving circuit.
Still further, the driving circuit includes a high-voltage side driving circuit, an interlock circuit, and a low-voltage side driving circuit, and the high-voltage side driving circuit is connected to the low-voltage side driving circuit through the interlock circuit.
Further, the high-voltage side driving circuit is provided with 3 channels, and comprises a high-side undervoltage protection circuit and a bootstrap circuit, wherein the high-side undervoltage protection circuit is used for realizing a high-side driving undervoltage protection function, and the bootstrap circuit is used for realizing a bootstrap power supply function; the low-voltage side driving circuit is provided with 3 channels.
Still further, the inverters include 6, 3 channels of the high-voltage side driving circuit drive 3 of the inverters, respectively, and 3 channels of the low-voltage side driving circuit drive another 3 of the inverters, respectively.
Further, each of the inverters includes a transistor and a flywheel diode disposed in parallel with the transistor.
The invention has the beneficial effects that: in the invention, a high-voltage integrated circuit and a thermistor with a negative temperature coefficient are arranged through the intelligent power module, and an FPC control circuit and a temperature control circuit are arranged through the high-voltage integrated circuit; the output of the FPC control circuit is controlled by the temperature control circuit according to the fact that the temperature detected by the thermistor reaches a preset high temperature threshold value, so that the power device is turned off; and the output of the FPC control circuit is controlled by the temperature control circuit according to the condition that the temperature detected by the thermistor is smaller than a preset low temperature threshold value, so that the normal operation of the power device is started and kept. The circuit is arranged so that the temperature control circuit can judge through the temperature detected by the thermistor to realize temperature monitoring when the FPC switching tube unit drives an external power device to work, and when the temperature detected by the thermistor reaches a preset high temperature threshold value, the temperature control circuit controls the output of the FPC control circuit to realize the shutdown of the power device; thereby avoid the intelligent power module effectively prevent FPC operating temperature high and arouse intelligent power module working property reduction to make intelligent power module's reliability is high.
Drawings
FIG. 1 is a schematic circuit diagram of one implementation of an intelligent power module provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of a part of a module structure of an intelligent power module according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of a portion of a high voltage integrated circuit of an intelligent power module according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a portion of an intelligent power module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples.
An intelligent power module 1000 of the present invention. Referring to fig. 1-2, fig. 1 is a schematic circuit diagram of an implementation of an intelligent power module 1000 according to an embodiment of the present invention; fig. 2 is a schematic block diagram of a portion of an intelligent power module 1000 according to an embodiment of the present invention.
The intelligent power module 1000 includes a high voltage integrated circuit 100 for receiving a driving signal and an FPC control signal respectively output from an external processor and a thermistor 200 having a negative temperature coefficient.
Referring to fig. 3, fig. 3 is a schematic block diagram of a portion of a high voltage integrated circuit 100 of an intelligent power module 1000 according to an embodiment of the invention. The high voltage integrated circuit 100 includes.
Specifically, the high-voltage integrated circuit 100 includes a driving circuit 1 for receiving the driving signal, an inverter 2 connected to the driving circuit 1, an FPC control circuit 3 for receiving the FPC control signal, an FPC switching tube unit 4 connected to the FPC control circuit 3, a temperature control circuit 5, an under-voltage protection circuit 6, an over-current protection circuit 7, a short-circuit protection circuit 8, an enable circuit 9, and a fault logic control circuit 10.
The driving circuit 1 is configured to drive the inverter 2 according to the driving signal.
The drive circuit 1 includes a high-voltage side drive circuit 11, an interlock circuit 12, and a low-voltage side drive circuit 13. The high-voltage side driving circuit 11 is connected to the low-voltage side driving circuit 13 through the interlock circuit 12.
In this embodiment, the high-voltage side driving circuit 11 is provided with 3 channels. The high-side drive circuit 11 includes a high-side under-voltage protection circuit 111 and a bootstrap circuit 112. The high-side undervoltage protection circuit 111 is used for realizing a high-side driving undervoltage protection function. The bootstrap circuit 112 is configured to implement a bootstrap power supply function. The low-voltage side drive circuit 13 is provided with 3 channels.
The inverter 2 is used for driving an external terminal device.
In this embodiment, the inverters 2 include 6 inverters. The 3 channels of the high-voltage side driving circuit 11 drive 3 of the inverters 2, respectively. The 3 channels of the low-voltage side driving circuit 13 drive the other 3 inverters 2, respectively.
In this embodiment, each of the inverters 2 includes a transistor 21 and a flywheel diode 22 disposed in parallel with the transistor 21. The transistor 21 is any one of an IGBT transistor, a reverse-conducting IGBT transistor, and a MOSFET transistor.
The FPC control circuit 3 is used for controlling the output of the FPC switching tube unit 4 according to the FPC control signal.
The FPC control circuit 3 includes a mitt trigger 31, a filter circuit 32, a potential shift circuit 33, a pulse generation circuit 34, and a delay circuit 35, which are connected in this order. Each circuit module in the FPC control circuit 3 is a circuit module commonly used in the art. Specific circuit structures and forms, device types and choices are selected according to actual design indexes, and detailed descriptions are omitted here.
The FPC switching tube unit 4 is used for driving an external power device. In this embodiment, the FPC switching tube unit 4 is used to drive an external variable frequency motor.
The temperature control circuit 5 is configured to control the output of the FPC control circuit 3 when the temperature detected by the thermistor 200 reaches a preset high temperature threshold, so as to shut down the power device.
The temperature control circuit 5 is further configured to control the output of the FPC control circuit 3 according to the fact that the temperature detected by the thermistor 200 is less than a preset low temperature threshold value, so as to start and maintain the normal operation of the power device.
Wherein a first end of the thermistor 200 is connected to an input of the temperature control circuit 5. The second end of the thermistor 200 is grounded. A first output of the temperature control circuit 5 is connected to an input of the FPC control circuit 3.
Specifically, the temperature control circuit 5 includes a voltage division comparing unit 51 and an output signal control unit 52 which are sequentially connected.
An input terminal of the voltage dividing and comparing unit 51 serves as an input terminal of the temperature control circuit 5. The input terminal of the voltage dividing and comparing unit 51 is used for judging whether the voltage corresponding to the temperature detected by the thermistor 200 reaches the high voltage corresponding to the preset high temperature threshold or the low voltage corresponding to the low temperature threshold.
A first output of the output signal control unit 52 serves as a first output of the temperature control circuit 5. A first output terminal of the output signal control unit 52 is configured to generate a high voltage or a low voltage for driving the FPC control circuit 3 according to an output of the voltage division comparison unit 51.
A second output terminal of the output signal control unit 52 serves as a second output terminal of the temperature control circuit 5. A second output of the temperature control circuit 5 is connected to the external processor. So that the processor stops or maintains the output of the driving signal and the FPC control signal after obtaining the condition of the temperature detected by the thermistor 200.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of a portion of an intelligent power module 1000 according to an embodiment of the invention. In this embodiment, the voltage division comparing unit 51 includes a resistor R, a capacitor C, and a comparator CMP. The output signal control unit 52 includes an inverter INV, a transistor M1, and a diode D1. The transistor M1 is an NMOS transistor.
The circuit connection relationship between the temperature control circuit 5 and the thermistor 200 is as follows:
the positive input of the comparator CMP serves as the input of the temperature control circuit 5. And the positive input terminal of the comparator CMP is connected to the second terminal of the resistor R and the first terminal of the capacitor C, respectively. The first end of the resistor R is connected to the supply voltage VDD. The second end of the capacitor C is grounded.
The negative input of the comparator CMP is connected to a reference voltage VREF.
An output terminal of the comparator CMP is connected to an input terminal of the inverter INV.
An output end of the inverter INV serves as a second output end of the temperature control circuit 5. And an output terminal of the inverter INV is connected to the gate of the transistor M1.
The source of the transistor M1 is grounded. The positive electrode of the diode D1 is grounded.
The drain of the transistor M1 serves as a first output of the temperature control circuit 5. And the drain of the transistor M1 is connected to the negative terminal of the diode D1.
The undervoltage protection circuit 6 is used for detecting whether the power supply voltage is too low. The under-voltage protection circuit 6 is disposed inside the high-voltage integrated circuit 100, which is beneficial to integration and miniaturization, and improves reliability. An output of the undervoltage protection circuit 6 is connected to a first input of the fault logic control circuit 10.
The overcurrent protection circuit 7 is used for detecting whether the input current is excessive. The overcurrent protection circuit 7 is disposed inside the high-voltage integrated circuit 100, which is advantageous for integration and miniaturization, and improves reliability. An output of the overcurrent protection circuit 7 is connected to a second input of the fault logic control circuit 10.
The short-circuit protection circuit 8 is used for detecting whether the circuit is short-circuited. The short-circuit protection circuit 8 is disposed inside the high-voltage integrated circuit 100, which is beneficial to integration and miniaturization, and improves reliability. The output of the short-circuit protection circuit 8 is connected to a third input of the fault logic control circuit 10.
The working principle of the temperature control circuit 5 is as follows:
in this embodiment, the thermistor 200 has the following model: NCP15WF104F03RC had a resistance of 100k at 25℃at normal temperature.
The formula provided by the NCP15WF104F03RC product data for thermistors: uout=ntc/(r+ntc) ×uin measured partial pressure values corresponding to different module case temperatures TC. Please refer to the following table 1:
Figure BDA0004072521250000091
Figure BDA0004072521250000101
table 1, a temperature parameter table of the thermistor 200.
In this embodiment, the resistor R is a pull-up resistor, and the resistance value of the resistor R is 6.8K. The capacitor C serves as a filter capacitor. The preset high temperature threshold is 100 deg. and the preset low temperature threshold is 90 deg.. The reference voltage VREF is 2.5V and the supply voltage VCC is 5V.
When the module shell temperature TC is more than 100 ℃, PFC stops working, the positive terminal voltage of the comparator CMP is calculated to be 2.1V, when the positive terminal voltage is compared with 2.5V of the reference voltage VREF, the comparator CMP outputs a low level, the inverter INV outputs a high level, at the moment, the transistor M1 is conducted, the FPC control signal is pulled down, and PFC stops driving.
When the module shell temperature TC is smaller than 90 degrees, PFC resumes work, the positive terminal voltage of the comparator CMP is calculated to be 2.6V, when the positive terminal voltage is compared with 2.5V of the reference voltage VREF, the comparator outputs high level, the inverter INV outputs low level, at the moment, the transistor M1 is cut off, the FPC control signal is a normal input signal of an external processor, and PFC works normally.
Through the analysis of the working principle of the temperature control circuit 5, the temperature control circuit 5 can effectively control the temperature of the intelligent power module 1000 to continuously rise, avoid thermal breakdown failure caused by overhigh temperature, improve the reliability of the intelligent power module 1000 and ensure the normal operation of the intelligent power module 1000.
The enabling circuit 9 is configured to set an enabling state of the high voltage integrated circuit 100 with the processor external thereto. The enabling circuit 9 is effective in high level and is responsible for turning on and off the executing function of the module, when the internal working fault state of the high-voltage integrated circuit 100 is monitored, the low level state is kept, the power supply is disconnected to protect the whole circuit of the high-voltage integrated circuit 100, when the fault disappears, the preset recovery time of the internal part reaches the design value, the high level state is recovered again, and the module is electrified to enter the working preparation state;
the FAULT logic control circuit 10 is configured to, when detecting that signals of the under-voltage protection circuit 6, the over-current protection circuit 7, and the short-circuit protection circuit 8 are abnormal, switch a FAULT signal output by the FAULT logic control circuit 10 from a high level to a low level state, and feed the signal back to the external processor, and the processor immediately takes action to cut off the signal, so that the intelligent power module 1000 stops working.
A second output of the temperature control circuit 5 is connected to a fourth input of the fault logic control circuit 10. The output of the FPC control circuit 3 is also connected to a fifth input of the fault logic control circuit 10. An input of the enable circuit 9 is connected to a first input of the fault logic control circuit 10. The output of the enabling circuit 9 is used for connecting to an external processor. A second input of the fault logic control circuit 10 is connected to a control terminal of the drive circuit 1.
The under-voltage protection circuit 6, the over-current protection circuit 7, the short-circuit protection circuit 8, the enabling circuit 9 and the fault logic control circuit 10 are all commonly used circuit modules in the art. Specific circuit structures and forms, device types and choices are selected according to actual design indexes, and detailed descriptions are omitted here.
The invention has the beneficial effects that: in the invention, a high-voltage integrated circuit 100 and a thermistor 200 with a negative temperature coefficient are arranged through the intelligent power module 1000, and an FPC control circuit 3 and a temperature control circuit 5 are arranged through the high-voltage integrated circuit 100; controlling the output of the FPC control circuit 3 by the temperature control circuit 5 when the temperature detected by the thermistor 200 reaches a preset high temperature threshold value so as to realize the shutdown of the power device; and controls the output of the FPC control circuit 3 by the temperature control circuit 5 according to the fact that the temperature detected by the thermistor 200 is smaller than a preset low temperature threshold value, so as to realize starting and keeping the normal operation of the power device. The circuit is arranged so that the temperature control circuit 5 can judge and realize temperature monitoring through the temperature detected by the thermistor 200 when the FPC switching tube unit 4 drives an external power device to work, and when the temperature detected by the thermistor 200 reaches a preset high temperature threshold value, the temperature control circuit 5 controls the output of the FPC control circuit 3 so as to realize the shutdown of the power device; thereby, the intelligent power module 1000 is prevented from effectively reducing the working performance of the intelligent power module caused by high working temperature of the FPC, and the reliability of the intelligent power module 1000 is high.
The foregoing is merely exemplary of the present invention, and those skilled in the art should not be considered as limiting the invention, since modifications may be made in the specific embodiments and application scope of the invention in light of the teachings of the present invention.

Claims (10)

1. An intelligent power module, the intelligent power module includes a high voltage integrated circuit for receiving a driving signal and an FPC control signal respectively output by an external processor; the high-voltage integrated circuit comprises a driving circuit for receiving the driving signal, an inverter connected with the driving circuit, an FPC control circuit for receiving the FPC control signal and an FPC switching tube unit connected with the FPC control circuit, wherein the driving circuit is used for driving the inverter according to the driving signal, and the inverter is used for driving external terminal equipment; the FPC control circuit is used for controlling the output of the FPC switching tube unit according to the FPC control signal, and the FPC switching tube unit is used for driving an external power device; it is characterized in that the method comprises the steps of,
the intelligent power module further comprises a thermistor with a negative temperature coefficient, and the high-voltage integrated circuit further comprises a temperature control circuit; the first end of the thermistor is connected to the input end of the temperature control circuit, and the second end of the thermistor is grounded; a first output end of the temperature control circuit is connected to an input end of the FPC control circuit;
the temperature control circuit is used for controlling the output of the FPC control circuit when the temperature detected by the thermistor reaches a preset high temperature threshold value so as to realize the shutdown of the power device; and the power device is also used for controlling the output of the FPC control circuit when the temperature detected by the thermistor is smaller than a preset low-temperature threshold value so as to realize starting and keep the normal operation of the power device.
2. The intelligent power module according to claim 1, wherein the temperature control circuit comprises a voltage division comparing unit and an output signal control unit which are sequentially connected,
the input end of the voltage division comparison unit is used as the input end of the temperature control circuit and is used for judging whether the voltage corresponding to the temperature detected by the thermistor reaches a high voltage corresponding to a preset high temperature threshold or a low value voltage corresponding to a low temperature threshold;
the first output end of the output signal control unit is used as the first output end of the temperature control circuit and is used for generating high voltage or low voltage for driving the FPC control circuit according to the output of the voltage division comparison unit.
3. The intelligent power module according to claim 2, wherein the second output terminal of the output signal control unit is used as the second output terminal of the temperature control circuit, and the second output terminal of the temperature control circuit is connected to the external processor, so that the processor stops or keeps outputting the driving signal and the FPC control signal after obtaining the temperature condition detected by the thermistor.
4. The intelligent power module according to claim 3, wherein the voltage dividing and comparing unit comprises a resistor, a capacitor and a comparator; the output signal control unit comprises an inverter, a transistor and a diode; the transistor is an NMOS (N-channel metal oxide semiconductor) transistor;
the positive input end of the comparator is used as the input end of the temperature control circuit, and is respectively connected to the second end of the resistor and the first end of the capacitor; a first end of the resistor is connected to a power supply voltage; the second end of the capacitor is grounded;
the negative input end of the comparator is connected to a reference voltage;
the output end of the comparator is connected to the input end of the inverter;
the output end of the inverter is used as a second output end of the temperature control circuit, and the output end of the inverter is connected to the grid electrode of the transistor;
the source electrode of the transistor is grounded; the positive electrode of the diode is grounded;
the drain of the transistor is used as a first output end of the temperature control circuit, and the drain of the transistor is connected to the cathode end of the diode.
5. The intelligent power module of claim 1, wherein the FPC control circuit comprises a mitt trigger, a filter circuit, a potential shift circuit, a pulse generation circuit, and a delay circuit connected in sequence.
6. The intelligent power module of claim 3, wherein the high voltage integrated circuit further comprises an under-voltage protection circuit, an over-current protection circuit, a short-circuit protection circuit, an enable circuit, and a fault logic control circuit;
the output end of the undervoltage protection circuit is connected to the first input end of the fault logic control circuit;
the output end of the overcurrent protection circuit is connected to the second input end of the fault logic control circuit;
the output end of the short-circuit protection circuit is connected to the third input end of the fault logic control circuit;
the second output end of the temperature control circuit is connected to the fourth input end of the fault logic control circuit;
the output end of the FPC control circuit is also connected to the fifth input end of the fault logic control circuit;
the input end of the enabling circuit is connected to the first input end of the fault logic control circuit, and the output end of the enabling circuit is used for being connected with an external processor;
the second input terminal of the fault logic control circuit is connected to the control terminal of the driving circuit.
7. The intelligent power module of claim 1, wherein the drive circuit comprises a high side drive circuit, an interlock circuit, and a low side drive circuit, the high side drive circuit being connected by the interlock circuit and the low side drive circuit.
8. The intelligent power module according to claim 7, wherein the high-voltage side driving circuit is provided with 3 channels, the high-voltage side driving circuit comprises a high-side under-voltage protection circuit and a bootstrap circuit, the high-side under-voltage protection circuit is used for realizing a high-side driving under-voltage protection function, and the bootstrap circuit is used for realizing a bootstrap power supply function; the low-voltage side driving circuit is provided with 3 channels.
9. The intelligent power module according to claim 8, wherein the inverters comprise 6, 3 channels of the high-side driving circuit drive 3 of the inverters, respectively, and 3 channels of the low-side driving circuit drive another 3 of the inverters, respectively.
10. The intelligent power module according to claim 9, wherein each of said inverters comprises a transistor and a freewheeling diode disposed in parallel with said transistor.
CN202310098536.0A 2023-02-10 2023-02-10 Intelligent power module Pending CN116169645A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117175909A (en) * 2023-11-02 2023-12-05 广东汇芯半导体有限公司 Intelligent PFC module of single power switch IGBT

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117175909A (en) * 2023-11-02 2023-12-05 广东汇芯半导体有限公司 Intelligent PFC module of single power switch IGBT
CN117175909B (en) * 2023-11-02 2024-03-12 广东汇芯半导体有限公司 Intelligent PFC module of single power switch IGBT

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