CN116191848A - Intelligent power module and high-voltage integrated system - Google Patents

Intelligent power module and high-voltage integrated system Download PDF

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Publication number
CN116191848A
CN116191848A CN202310098535.6A CN202310098535A CN116191848A CN 116191848 A CN116191848 A CN 116191848A CN 202310098535 A CN202310098535 A CN 202310098535A CN 116191848 A CN116191848 A CN 116191848A
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circuit
humidity
control circuit
fault
transistor
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冯宇翔
左安超
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Guangdong Huixin Semiconductor Co Ltd
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Guangdong Huixin Semiconductor Co Ltd
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Priority to CN202310098535.6A priority Critical patent/CN116191848A/en
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    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • General Physics & Mathematics (AREA)
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Abstract

The invention provides an intelligent power module and a high-voltage integrated system, wherein the intelligent power module comprises a high-voltage integrated circuit, an inverter, a humidity sensor and a first transistor; the high-voltage integrated circuit comprises a fault logic control circuit, a driving circuit and a humidity detection control circuit, and the equivalent resistance value of the humidity sensor corresponds to the outside humidity one by one and has negative correlation characteristics; the drain electrode of the first transistor is used for outputting a second fault signal generated by the fault logic control circuit; the humidity detection control circuit is used for judging whether the equivalent resistance value is smaller than a preset resistance value or not and outputting a humidity fault signal; the fault logic control circuit is used for generating a second fault signal according to the humidity fault signal and outputting the second fault signal to the first transistor, and the second fault signal is used for setting the driving signal to be low level by the processor so as to start fault protection. Compared with the related art, the technical scheme of the invention can prevent the occurrence of abnormality in a high-humidity environment and has high reliability.

Description

Intelligent power module and high-voltage integrated system
Technical Field
The invention relates to the technical field of electronic circuits, in particular to an intelligent power module and a high-voltage integrated system.
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.
In the related art, the application environment of the intelligent power module integrated with the high-voltage integrated circuit is worse, the intelligent power module is often used in places such as high temperature, high humidity, low temperature, coasts and the like, especially the integration level of the intelligent power module is higher and higher, the pin gaps tend to be dense, for example, the intelligent power module is started in a high-humidity environment, moisture attached to the surface of the intelligent power module is not driven away because the intelligent power module does not generate heat, electric leakage exists between pins, and the intelligent power module is of a non-fully-sealed structure, moisture invades the inside of the intelligent power module, and causes internal electric leakage, so that the intelligent power module is invalid. How to avoid the abnormality of the intelligent power module in a high humidity environment and improve the reliability of the intelligent power module.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an intelligent power module and a high-voltage integrated system, which can effectively prevent the occurrence of abnormality in a high-humidity environment and have high reliability.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a smart power module including a high voltage integrated circuit for receiving a driving signal and an inverter connected to the high voltage integrated circuit; the high-voltage integrated circuit comprises a fault logic control circuit and a driving circuit which are electrically connected in sequence, wherein the fault logic control circuit is used for generating a first fault signal, and a first output end of the fault logic control circuit is connected to an enabling input end of the driving circuit; the driving circuit drives the inverter according to the driving signal and enters a locking state according to the first fault signal; the lock-up sets the outputs of all of its channels to low level for the drive circuit; the inverter is used for driving external terminal equipment;
the intelligent power module further comprises a humidity sensor and a first transistor, wherein the equivalent resistance of the humidity sensor corresponds to the external humidity one by one, and the intelligent power module has the negative correlation characteristic that the higher the external humidity is, the smaller the equivalent resistance is; the first transistor is an NMOS (N-channel metal oxide semiconductor) transistor, the second output end of the fault logic control circuit is connected to the grid electrode of the first transistor, and the source electrode of the first transistor is grounded; the drain electrode of the first transistor is used as a first humidity output end of the intelligent power module and is used for outputting a second fault signal generated by the fault logic control circuit to an external processor to start fault protection;
the high-voltage integrated circuit further comprises a humidity detection control circuit, wherein the input end of the humidity detection control circuit is connected to the output end of the humidity sensor, and the first output end of the humidity detection control circuit is connected to the first input end of the fault logic control circuit; the humidity detection control circuit is used for judging whether the equivalent resistance value is smaller than a preset resistance value or not and outputting a humidity fault signal; the fault logic control circuit is further used for generating a corresponding second fault signal according to the received humidity fault signal and outputting the second fault signal to the first transistor, and setting the first fault signal to be high level so as to lock the driving circuit; the second fault signal is for the processor to set the drive signal low to initiate fault protection.
Still further, the intelligent power module further comprises a second transistor, wherein a second output end of the humidity detection control circuit is connected to a gate electrode of the second transistor, and a source electrode of the second transistor is grounded; the drain electrode of the second transistor is used as a second humidity output end of the intelligent power module and used for judging the humidity state by the processor; and when the processor judges the humidity state according to the fact that the equivalent resistance is smaller than a preset resistance, the humidity detection control circuit controls the signal output by the drain electrode of the second transistor to be low level, and then the processor judges the humidity state to be a state in which humidity fault protection needs to be started.
Further, the humidity detection control circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a comparator and an inverter;
the negative input end of the comparator is used as the input end of the humidity detection control circuit, and is respectively connected to the first end of the first capacitor and the second end of the first resistor; the second end of the first capacitor is grounded;
the first end of the first resistor is connected to a power supply voltage, the first end of the second resistor and the power supply input end of the comparator respectively;
the second end of the second resistor is respectively connected to the positive input end of the comparator, the first end of the third resistor and the first end of the second capacitor;
the grounding end of the comparator, the first end of the third resistor and the first end of the second capacitor are grounded;
the output end of the comparator is used as a second output end of the humidity detection control circuit, and 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 first output end of the humidity detection control circuit.
Still further, the high voltage integrated circuit further comprises an enabling circuit comprising an enabling schmitt circuit, an enabling filter and an enabling level shift circuit;
the input end of the enabling schmitt circuit is used as an enabling signal input end of the intelligent power module and is used for receiving an EN signal sent by the processor so as to enable the driving circuit to enter a locking state;
the output end of the enabling schmitt circuit is connected to the input end of the enabling filter;
the output end of the enabling filter is connected to the input end of the enabling level conversion circuit;
the output end of the enabling level conversion circuit is used as the output end of the enabling circuit;
the output end of the enabling circuit is connected to the first input end of the fault logic control circuit and the first output end of the humidity detection control circuit respectively.
Further, the high-voltage integrated circuit further comprises an undervoltage protection circuit and an overcurrent protection circuit;
the output end of the undervoltage protection circuit is connected to the second input end of the fault logic control circuit;
the output end of the overcurrent protection circuit is connected to the third input end of the fault logic control 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 diode disposed in parallel with the transistor.
In a second aspect, the invention further provides a high-voltage integrated system, which comprises a processor, the intelligent power module and the terminal device, wherein the processor, the intelligent power module and the terminal device are electrically connected in sequence.
The invention has the beneficial effects that: in the invention, a high-voltage integrated circuit, a humidity sensor and a first transistor are arranged through the intelligent power module, and then a humidity detection control circuit is arranged through the high-voltage integrated circuit; the humidity detection control circuit judges that a humidity fault signal is output when the equivalent resistance of the humidity sensor is smaller than a preset resistance, the fault logic control circuit generates a corresponding second fault signal according to the received humidity fault signal and outputs the second fault signal to the first transistor, and the drain electrode of the first transistor outputs the second fault signal generated by the fault logic control circuit to an external processor to start fault protection. Meanwhile, the fault logic control circuit sets the first fault signal to a high level to lock the driving circuit, and the locking sets the outputs of all channels of the driving circuit to a low level. The circuit is arranged so that the humidity detection control circuit can output a humidity fault signal when the external humidity is high through judging that if the equivalent resistance value is smaller than a preset resistance value, then sequentially pass through the fault logic control circuit and the first transistor to output a second fault signal to an external processor to start fault protection, and simultaneously the fault logic control circuit sets the first fault signal to be high level so as to lock the driving circuit, thereby avoiding the occurrence of abnormality of the intelligent power module and the high-voltage integrated system in a high-humidity environment, and further ensuring high reliability of the intelligent power module and the high-voltage integrated system.
Drawings
FIG. 1 is a block diagram of an intelligent power module according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of one implementation of an intelligent power module provided by an embodiment of the present invention;
fig. 3 is a schematic block diagram of a high-voltage integrated circuit of an intelligent power module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an intelligent power module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a portion of a circuit of an intelligent power module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a high voltage integrated system 2000 according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to examples.
An intelligent power module 1000 of the present invention. Referring to fig. 1-2, fig. 1 is a block diagram of an intelligent power module 1000 according to an embodiment of the present invention; fig. 2 is a schematic circuit diagram of an implementation of the intelligent power module 1000 according to an embodiment of the present invention.
The smart power module 1000 includes a high voltage integrated circuit 100 for receiving a driving signal, an inverter 200 connected to the high voltage integrated circuit 100, a humidity sensor MS, a first transistor M1, and a second transistor M2.
Referring to fig. 3, fig. 3 is a schematic block diagram 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 comprises a fault logic control circuit 1, a driving circuit 2, a humidity detection control circuit 3, an enabling circuit 4, an undervoltage protection circuit 5 and an overcurrent protection circuit 6 which are electrically connected in sequence.
The fault logic control circuit 1 is configured to generate a first fault signal. Specifically, the fault logic control circuit 1 performs logic operation according to the input signals of the enable circuit 4, the undervoltage protection circuit 5 and the overcurrent protection circuit 6, and generates the first fault signal.
In the present embodiment, the enabling circuit 4 includes an enabling schmitt circuit 41, an enabling filter 42, and an enabling level converting circuit 43.
Specifically, the input terminal of the enable schmitt circuit 41 is used as the enable signal input terminal EN of the intelligent power module 1000. For receiving EN signals sent by the processor to bring the driving circuit 2 into lock.
An output of the enable schmitt circuit 41 is connected to an input of the enable filter 42.
An output of the enable filter 42 is connected to an input of the enable level shift circuit 43.
An output terminal of the enable level shift circuit 43 serves as an output terminal of the enable circuit 4.
The output of the enabling circuit 4 is connected to a first input of the fault logic control circuit 1 and to a first output of the humidity detection control circuit 3, respectively.
The circuit structures of the undervoltage protection circuit 5 and the overcurrent protection circuit 6 are the same as the circuit structure of the enabling circuit 4. The specific circuit device model and selection are selected according to actual design indexes, and detailed description is omitted here.
An output terminal of the under-voltage protection circuit 5 is connected to a second input terminal of the fault logic control circuit 1.
An output of the overcurrent protection circuit 6 is connected to a third input of the fault logic control circuit 1.
A first output of the fault logic control circuit 1 is connected to an enable input of the drive circuit 2.
The driving circuit 2 drives the inverter 200 according to the driving signal and enters a lock-up according to the first failure signal. The lock-out sets the outputs of all its channels to a low level for the drive circuit 2.
The drive circuit 2 includes a high-voltage side drive circuit 21, an interlock circuit 22, and a low-voltage side drive circuit 23. The high-voltage side drive circuit 21 is connected to the low-voltage side drive circuit 23 through the interlock circuit 22.
In this embodiment, the high-voltage side driving circuit 21 is provided with 3 channels. The high-side driving circuit 21 includes a high-side under-voltage protection circuit 211 and a bootstrap circuit 212. The high-side undervoltage protection circuit 211 is used for realizing a high-side driving undervoltage protection function. The bootstrap circuit 212 is configured to implement a bootstrap power supply function.
In this embodiment, the low-voltage side driving circuit 23 is provided with 3 channels.
The inverter 200 is used to drive an external terminal device.
In this embodiment, the inverters 200 include 6 inverters. The 3 channels of the high-voltage side driving circuit 21 drive 3 of the inverters 200, respectively. The 3 channels of the low-voltage side driving circuit 23 drive the other 3 inverters 200, respectively.
In this embodiment, each of the inverters 200 includes a transistor 201 and a diode 202 disposed in parallel with the transistor 201.
The transistor 201 is any one of an IGBT transistor, a reverse-conducting IGBT transistor, or a MOSFET transistor.
The equivalent resistance value of the humidity sensor MS corresponds to the external humidity one by one, and has the negative correlation characteristic that the higher the external humidity is, the smaller the equivalent resistance value is.
Referring to fig. 4, fig. 4 is a schematic package diagram of an intelligent power module 1000 according to an embodiment of the invention.
In the package of the intelligent power module 1000, the intelligent power module 1000 further includes a metal substrate B1, an adhesive B2 attached to one side of the metal substrate B1, an insulating layer B3, and a sealing resin B4.
The insulating layer B3 and the high-voltage integrated circuit 100 are respectively spaced apart from each other and are attached to a side of the adhesive B2 away from the metal substrate B1, and the triode 201 and the diode 202 are attached to a side of the high-voltage integrated circuit 100 away from the metal substrate B1. The sealing resin B4 seals the metal substrate B1, the adhesive B2, the transistor 201, the diode 202, and the high-voltage integrated circuit 100.
The humidity sensor MS is attached to one side of the insulating layer B3 away from the metal substrate B1.
The humidity sensor MS is connected through the metal substrate B1 and the adhesive B, and the sealing resin B4 is not encapsulated above the humidity sensor MS, so that the humidity in the air can be conveniently detected.
The first transistor M1 is an NMOS transistor.
An input of the humidity detection control circuit 3 is connected to an output of the humidity sensor MS. A first output of the humidity detection control circuit 3 is connected to a first input of the fault logic control circuit 1.
The humidity detection control circuit 3 is configured to determine that a humidity fault signal is output if the equivalent resistance is smaller than a preset resistance. In this embodiment, the external humidity reaches more than 95%, and the preset resistance value corresponds to 95% of the external humidity. That is, when the external humidity reaches 95% or more, the intelligent power module 1000 is prone to be abnormal, and the reliability is low.
Referring to fig. 5, fig. 5 is a schematic diagram of a portion of a circuit of an intelligent power module 1000 according to an embodiment of the invention. The humidity detection control circuit 3 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a comparator CMP, and an inverter INV.
The circuit connection relation of the humidity detection control circuit 3 is as follows:
the negative input of the comparator CMP serves as the input of the humidity detection control circuit 3. And the negative input terminal of the comparator CMP is connected to the first terminal of the first capacitor C1 and the second terminal of the first resistor R1, respectively. The second end of the first capacitor C1 is grounded GND.
The first end of the first resistor R1 is connected to a power supply voltage, the first end of the second resistor R2 and the power supply input end of the comparator CMP, respectively.
The second end of the second resistor R2 is connected to the positive input end of the comparator CMP, the first end of the third resistor R3 and the first end of the second capacitor C2, respectively.
The ground GND terminal of the comparator CMP, the first terminal of the third resistor R3, and the first terminal of the second capacitor C2 are all grounded GND.
An output terminal of the comparator CMP serves as a second output terminal of the humidity detection control circuit 3. And 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 first output end of the humidity detection control circuit 3.
The working principle of the humidity detection control circuit 3 is as follows:
the first capacitor C1 and the second capacitor C2 serve as filter capacitors. The equivalent resistance value of the humidity sensor MS is larger along with the larger humidity, the larger resistance value is, and the resistance value is changed, and the first capacitor C1 and the second capacitor C2 of the humidity detection control circuit 3 filter circuit clutter of the humidity detection control circuit, so that the false triggering of the humidity detection control circuit 3 is avoided, and the stability of the circuit is improved.
The comparator CMP acts as a voltage comparator. The reference voltage of the comparator CMP is formed by the second resistor R2 and the third resistor R3, the reference voltage is connected with the positive input end of the comparator CMP, the detection voltage formed by the first resistor R1 and the humidity sensor MS is connected with the negative input end of the comparator CMP, when the humidity sensor MS is influenced by external humidity, the equivalent resistance value of the humidity sensor MS can change, when the equivalent resistance value of the humidity sensor MS is lower than a certain value, the negative input end of the comparator CMP is lower than the positive input end of the comparator CMP, the comparator CMP outputs a high level to drive the second transistor M2 to be conducted, meanwhile, the inverter INV outputs a low level to trigger the fault logic control circuit 1 to start a fault state, the fault logic control circuit 1 outputs a first fault signal Enable high level signal and a second fault signal FG high level signal, the first fault signal Enable is a high level signal to control the switch of each channel of the driving circuit 2, and when the first fault signal Enable is a high level signal Enable and the driving circuit is a low signal and is a low signal corresponding to the high level and is a low signal and is a high signal and is a low signal and is a high and a signal is a low signal and a is a high signal and a is a low signal. Meanwhile, the second fault signal FG high level signal drives the first transistor M1 to be turned on, the low level signal FT is output via the drain electrode of the first transistor M1, the processor detects the low level signal FT, and at the same time, triggers the fault protection, and the driving signal of each channel of the driving circuit 2 is set to be low level, so as to perform the fault protection. Meanwhile, the other path of the humidity detection control circuit 3 outputs a high level through the second transistor M2, controls the second transistor M2 to be turned on, outputs a low level signal through the drain electrode of the second transistor M2, detects the low level signal by the external processor, triggers the fault protection of the excessive humidity, and the driving signal of each channel of the driving circuit 2 is set to be a low level to perform fault protection.
A second output terminal of the fault logic control circuit 1 is connected to the gate of the first transistor M1. The source of the first transistor M1 is grounded GND. The drain electrode of the first transistor M1 is used as a first humidity output end of the intelligent power module 1000, and is configured to output a second fault signal generated by the fault logic control circuit 1 to an external processor to start fault protection. The first humidity output end of the intelligent power module 1000 is convenient for the external processor to recognize whether the module fault is a protection action caused by the humidity fault.
The fault logic control circuit 1 is further configured to generate a corresponding second fault signal according to the received humidity fault signal and output the second fault signal to the first transistor M1. While setting the first fault signal to a high level to lock the drive circuit 2. The second fault signal is for the processor to set the drive signal low to initiate fault protection.
Meanwhile, a second output terminal of the humidity detection control circuit 3 is connected to the gate of the second transistor M2. The source of the second transistor M2 is grounded GND. The drain of the second transistor M2 serves as a second humidity output terminal of the intelligent power module 1000. For the processor to determine the humidity state. And the processor judges the humidity state according to the condition that the equivalent resistance value is smaller than a preset resistance value. The humidity detection control circuit 3 controls the signal output by the drain electrode of the second transistor M2 to be at a low level, and the processor determines that the humidity state is a state in which humidity fault protection needs to be started.
The intelligent power module 1000 integrates the humidity sensor MS and sets the drain electrode of the second transistor M2 as the second humidity output end of the intelligent power module 1000, so that the processor can be conveniently connected externally to identify the protection action caused by the humidity fault.
The working principle of the intelligent power module 1000 for protecting the start humidity fault is as follows:
when the fault logic control circuit 1 receives the Enable signal EN low level signal, it outputs a first fault signal Enable as a high level signal and a second fault signal FG as a high level signal, the first fault signal Enable is a high level signal to control the switch of each channel of the driving circuit 2, when the first fault signal Enable is a high level, the upper and lower bridge driving signals of the driving circuit 2 are locked no matter in the high and low levels, and the corresponding signal output end outputs a low level signal. Meanwhile, the second transistor M2 is driven to be turned on by the high-level signal of the second fault signal FG, the low-level signal FT is output through the drain electrode of the first transistor M1, the processor detects the low-level signal FT, and at the same time, the fault protection is triggered, and the driving signal of each channel of the driving circuit 2 is set to be low level, so as to perform the fault protection.
When the humidity sensor MS detects that the humidity is higher than the preset value of the humidity detection control circuit 3, the humidity detection control circuit 3 outputs a low level and is connected with the Enable circuit 4, the fault logic control circuit 1 receives a low level signal that enables EN to be favored, outputs a first fault signal Enable as a high level signal and a second fault signal FG as a high level signal, the first fault signal Enable controls the switch of each channel of the driving circuit 2 as a high level signal, and when the first fault signal Enable is at a high level, upper and lower bridge driving signals of the driving circuit 2 are locked no matter in the high and low levels, and corresponding signal output ends are all output as low level signals. Meanwhile, the second fault signal FG is a high level signal, which drives the first transistor M1 to be turned on, a low level signal is output via the drain electrode of the first transistor M1, the processor detects the low level signal FT, and triggers the fault protection at the same time, and the driving signal of each channel of the driving circuit 2 is set to be low level, so as to perform the fault protection. Meanwhile, the other path of the humidity detection control circuit 3 outputs a high level through the second transistor M2, controls the second transistor M2 to be turned on, outputs a low level signal through the drain electrode of the second transistor M2, detects the low level signal by the external processor, triggers the fault protection of the excessive humidity, and the driving signal of each channel of the driving circuit 2 is set to be a low level to perform fault protection.
The invention also provides a high voltage integrated system 2000. Referring to fig. 6, fig. 6 is a schematic structural diagram of a high voltage integrated system 2000 according to an embodiment of the present invention.
The high voltage integrated system 2000 includes a processor 300, the intelligent power module 1000, and a terminal device 400, which are electrically connected in sequence.
The high voltage integrated system 2000 provided by the embodiment of the present invention can implement each implementation manner and corresponding beneficial effects in the embodiment of the intelligent power module 1000, and in order to avoid repetition, a description is omitted here.
The invention has the beneficial effects that: in the invention, a high-voltage integrated circuit 100, a humidity sensor MS and a first transistor M1 are arranged through the intelligent power module 1000, and then a humidity detection control circuit 3 is arranged through the high-voltage integrated circuit 100; the humidity detection control circuit 3 determines that a humidity fault signal is output if the equivalent resistance of the humidity sensor MS is smaller than a preset resistance, the fault logic control circuit 1 generates a corresponding second fault signal according to the received humidity fault signal and outputs the second fault signal to the first transistor M1, and the drain of the first transistor M1 outputs the second fault signal generated by the fault logic control circuit 1 to the external processor 300 to start fault protection. Meanwhile, the fault logic control circuit 1 sets the first fault signal to a high level to lock the driving circuit 2, the lock being that the driving circuit 2 sets the outputs of all its channels to a low level. The circuit is configured such that when the external humidity is high, the humidity detection control circuit 3 may output a humidity fault signal by judging that if the equivalent resistance is smaller than a preset resistance, and then sequentially output the second fault signal to the external processor 300 through the fault logic control circuit 1 and the first transistor M1 to start fault protection, and simultaneously set the first fault signal to a high level through the fault logic control circuit 1 so as to lock the driving circuit 2, thereby avoiding the occurrence of abnormality of the intelligent power module 1000 and the high-voltage integrated system 2000 in a high-humidity environment, so that the reliability of the intelligent power module 1000 and the high-voltage integrated system 2000 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. A smart power module comprising a high voltage integrated circuit for receiving a drive signal and an inverter connected to the high voltage integrated circuit; the high-voltage integrated circuit comprises a fault logic control circuit and a driving circuit which are electrically connected in sequence, wherein the fault logic control circuit is used for generating a first fault signal, and a first output end of the fault logic control circuit is connected to an enabling input end of the driving circuit; the driving circuit drives the inverter according to the driving signal and enters a locking state according to the first fault signal; the lock-up sets the outputs of all of its channels to low level for the drive circuit; the inverter is used for driving external terminal equipment; it is characterized in that the method comprises the steps of,
the intelligent power module further comprises a humidity sensor and a first transistor, wherein the equivalent resistance of the humidity sensor corresponds to the external humidity one by one, and the intelligent power module has the negative correlation characteristic that the higher the external humidity is, the smaller the equivalent resistance is; the first transistor is an NMOS (N-channel metal oxide semiconductor) transistor, the second output end of the fault logic control circuit is connected to the grid electrode of the first transistor, and the source electrode of the first transistor is grounded; the drain electrode of the first transistor is used as a first humidity output end of the intelligent power module and is used for outputting a second fault signal generated by the fault logic control circuit to an external processor to start fault protection;
the high-voltage integrated circuit further comprises a humidity detection control circuit, wherein the input end of the humidity detection control circuit is connected to the output end of the humidity sensor, and the first output end of the humidity detection control circuit is connected to the first input end of the fault logic control circuit; the humidity detection control circuit is used for judging whether the equivalent resistance value is smaller than a preset resistance value or not and outputting a humidity fault signal; the fault logic control circuit is further used for generating a corresponding second fault signal according to the received humidity fault signal and outputting the second fault signal to the first transistor, and setting the first fault signal to be high level so as to lock the driving circuit; the second fault signal is for the processor to set the drive signal low to initiate fault protection.
2. The intelligent power module according to claim 1, further comprising a second transistor, wherein a second output of the humidity detection control circuit is connected to a gate of the second transistor, and wherein a source of the second transistor is grounded; the drain electrode of the second transistor is used as a second humidity output end of the intelligent power module and used for judging the humidity state by the processor; and when the processor judges the humidity state according to the fact that the equivalent resistance is smaller than a preset resistance, the humidity detection control circuit controls the signal output by the drain electrode of the second transistor to be low level, and then the processor judges the humidity state to be a state in which humidity fault protection needs to be started.
3. The intelligent power module of claim 2, wherein the humidity detection control circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a comparator, and an inverter;
the negative input end of the comparator is used as the input end of the humidity detection control circuit, and is respectively connected to the first end of the first capacitor and the second end of the first resistor; the second end of the first capacitor is grounded;
the first end of the first resistor is connected to a power supply voltage, the first end of the second resistor and the power supply input end of the comparator respectively;
the second end of the second resistor is respectively connected to the positive input end of the comparator, the first end of the third resistor and the first end of the second capacitor;
the grounding end of the comparator, the first end of the third resistor and the first end of the second capacitor are grounded;
the output end of the comparator is used as a second output end of the humidity detection control circuit, and 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 first output end of the humidity detection control circuit.
4. The intelligent power module of claim 3, wherein said high voltage integrated circuit further comprises an enable circuit comprising an enable schmitt circuit, an enable filter, and an enable level shift circuit;
the input end of the enabling schmitt circuit is used as an enabling signal input end of the intelligent power module and is used for receiving an EN signal sent by the processor so as to enable the driving circuit to enter a locking state;
the output end of the enabling schmitt circuit is connected to the input end of the enabling filter;
the output end of the enabling filter is connected to the input end of the enabling level conversion circuit;
the output end of the enabling level conversion circuit is used as the output end of the enabling circuit;
the output end of the enabling circuit is connected to the first input end of the fault logic control circuit and the first output end of the humidity detection control circuit respectively.
5. The intelligent power module of claim 4, wherein the high voltage integrated circuit further comprises an under-voltage protection circuit and an over-current protection circuit;
the output end of the undervoltage protection circuit is connected to the second input end of the fault logic control circuit;
the output end of the overcurrent protection circuit is connected to the third input end of the fault logic control circuit.
6. 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.
7. The intelligent power module of claim 6, wherein the high-side drive circuit is provided with 3 channels, the high-side drive 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 drive 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.
8. The intelligent power module according to claim 7, wherein the inverters include 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.
9. The intelligent power module according to claim 8, wherein each of said inverters comprises a transistor and a diode disposed in parallel with said transistor.
10. A high voltage integrated system comprising a processor, an intelligent power module according to any of claims 1-9 and a terminal device electrically connected in sequence.
CN202310098535.6A 2023-02-10 2023-02-10 Intelligent power module and high-voltage integrated system Pending CN116191848A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117081370A (en) * 2023-08-30 2023-11-17 海信家电集团股份有限公司 Intelligent power module IPM, control method and equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117081370A (en) * 2023-08-30 2023-11-17 海信家电集团股份有限公司 Intelligent power module IPM, control method and equipment
CN117081370B (en) * 2023-08-30 2024-04-02 海信家电集团股份有限公司 Intelligent power module IPM, control method and equipment

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