Intelligent power module and electric equipment

Abstract

The utility model discloses an intelligent power module and electric equipment, and the module comprises a first enabling end and a low-voltage region power supply negative end, and the first enabling end is suitable for being connected with an auxiliary detection circuit; the driving chip is provided with a second enabling end and a ground end; the first end of the over-temperature protection circuit is connected with the first enabling end, the second end of the over-temperature protection circuit is connected with the second enabling end, and the third end of the over-temperature protection circuit is connected with the negative end and the ground end of the low-voltage area power supply; the auxiliary detection circuit cooperates with the over-temperature protection circuit to detect the temperature of the intelligent power module and outputs a corresponding voltage to the second enable end. Therefore, according to the module, module temperature detection is achieved through the over-temperature protection circuit, voltage changes generated by temperature changes directly act on the second enabling end, the response speed, safety and reliability of over-temperature protection are improved, meanwhile, circuit connection can be conducted through an original port, no extra port needs to be added, and the application cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent power modules, in particular to an intelligent power module and an electric device. Background Art

[0002] In order to realize over-temperature protection of the intelligent power module, a thermistor is usually installed inside the intelligent power module. The thermistor is connected to an external MCU (Microcontroller Unit). The external MCU determines the module temperature based on the feedback voltage of the thermistor and outputs a shutdown signal to the intelligent power module when it is judged that the module temperature exceeds the set value, so as to realize over-temperature protection of the intelligent power module.

[0003] However, this technical solution requires an external MCU to implement the module protection function, and the response speed is slow. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the utility model is to propose an intelligent power module, in which the over-temperature protection circuit realizes module temperature detection based on the auxiliary detection circuit, and directly acts on the voltage change caused by the temperature change to the second enable terminal, thereby improving the reaction speed of the over-temperature protection and the safety and reliability of the module operation. At the same time, the circuit connection can be based on the original port of the intelligent power module and the driver chip, without adding additional ports, thereby reducing the application cost and circuit complexity.

[0005] The second purpose of the utility model is to provide an electrical device.

[0006] To achieve the above-mentioned purpose, the first aspect of the utility model proposes an intelligent power module, including: a first enable terminal and a negative terminal of a low-voltage power supply, the first enable terminal is suitable for connecting an auxiliary detection circuit; a driving chip, the driving chip has a second enable terminal and a ground terminal; an over-temperature protection circuit, the first end of the over-temperature protection circuit is connected to the first enable terminal, the second end of the over-temperature protection circuit is connected to the second enable terminal, and the third end of the over-temperature protection circuit is respectively connected to the negative terminal of the low-voltage power supply and the ground terminal; wherein the auxiliary detection circuit cooperates with the over-temperature protection circuit to detect the temperature of the intelligent power module and outputs a corresponding voltage to the second enable terminal.

[0007] According to the intelligent power module of the utility model, the driver chip has a second enable terminal and a ground terminal; an over-temperature protection circuit, the first end of the over-temperature protection circuit is connected to the first enable terminal of the intelligent power module, the second end of the over-temperature protection circuit is connected to the second enable terminal of the driver chip, the third end of the over-temperature protection circuit is respectively connected to the negative end of the low-voltage area power supply of the intelligent power module and the ground terminal of the driver chip, and the auxiliary detection circuit cooperates with the over-temperature protection circuit to detect the temperature of the intelligent power module and output the corresponding voltage to the second enable terminal. Thus, the over-temperature protection circuit in the intelligent power module realizes module temperature detection based on the auxiliary detection circuit, and directly acts the voltage change caused by the temperature change on the second enable terminal, which improves the reaction speed of the over-temperature protection and the safety and reliability of the module. At the same time, the circuit connection can be based on the original ports of the intelligent power module and the driver chip, without adding additional ports, reducing the application cost and circuit complexity.

[0008] In addition, the intelligent power module according to the above embodiment of the utility model may also have the following additional technical features:

[0009] Specifically, the second enable terminal has a high level threshold voltage and a low level threshold voltage. When the voltage is greater than the high level threshold voltage, the second enable terminal generates a first enable signal. When the voltage is less than the low level threshold voltage, the second enable terminal generates a second enable signal.

[0010] Specifically, the over-temperature protection circuit includes: a thermistor, one end of the thermistor is respectively connected to the first enable end and the second enable end, and the other end of the thermistor is respectively connected to the negative end of the low-voltage area power supply and the ground end.

[0011] Furthermore, the over-temperature protection circuit also includes: a first resistor, which is connected in series between the first enable terminal and one end of the thermistor.

[0012] Furthermore, the over-temperature protection circuit also includes: a second resistor, the second resistor is connected in parallel or in series with the thermistor; or, a second resistor and a third resistor, the second resistor and the thermistor are connected in series and then connected in parallel with the third resistor, or the third resistor and the thermistor are connected in parallel and then connected in series with the second resistor.

[0013] Specifically, the over-temperature protection circuit includes: a thermistor and a fourth resistor, one end of the thermistor is connected to the first enable end, the other end of the thermistor is connected to the second enable end, one end of the fourth resistor is respectively connected to the other end of the thermistor and the second enable end, and the other end of the fourth resistor is respectively connected to the negative end of the low-voltage area power supply and the ground end.

[0014] Furthermore, the over-temperature protection circuit also includes: a fifth resistor, the fifth resistor is connected in series or in parallel with the thermistor; or, a fifth resistor and a sixth resistor, the fifth resistor and the thermistor are connected in series and then connected in parallel with the sixth resistor, or the sixth resistor and the thermistor are connected in parallel and then connected in series with the fifth resistor.

[0015] Specifically, the auxiliary detection circuit includes: an auxiliary resistor, which is connected in series between the first power supply and the first enable terminal.

[0016] Specifically, the thermistor includes a plurality of thermistors, and the plurality of thermistors are connected in series and / or in parallel.

[0017] In order to achieve the above-mentioned object, the second aspect of the utility model provides an electrical device, including the above-mentioned intelligent power module.

[0018] According to the electrical equipment of the embodiment of the utility model, based on the above-mentioned intelligent power module, the reaction speed of over-temperature protection and the safety and reliability of equipment operation are improved.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A connection diagram of an intelligent power module according to an embodiment of the utility model;

[0021] Figure 2 A circuit diagram of an intelligent power module according to an embodiment of the utility model;

[0022] Figure 3 A circuit diagram of an intelligent power module according to a specific embodiment of the utility model;

[0023] Figure 4 A circuit diagram of an over-temperature protection circuit according to a specific embodiment of the utility model Figure 1 ;

[0024] Figure 5 A circuit diagram of an over-temperature protection circuit according to a specific embodiment of the utility model Figure 2 ;

[0025] Figure 6 A circuit diagram of an over-temperature protection circuit according to a specific embodiment of the utility model Figure 3 ;

[0026] Figure 7 A circuit diagram of an over-temperature protection circuit according to a specific embodiment of the utility model Figure 4 ;

[0027] Figure 8A circuit diagram of an over-temperature protection circuit according to a specific embodiment of the utility model Figure 5 ;

[0028] Fig. 9 A circuit diagram of an over-temperature protection circuit according to a specific embodiment of the utility model Figure 6 ;

[0029] Fig.10 A circuit diagram of an over-temperature protection circuit according to a specific embodiment of the utility model Figure 7 ;

[0030] Fig.11 A circuit diagram of an over-temperature protection circuit according to a specific embodiment of the utility model Figure 8 ;

[0031] Fig.12 A circuit diagram of an over-temperature protection circuit according to a specific embodiment of the utility model Figure 9 ;

[0032] Fig.13 A circuit diagram of an over-temperature protection circuit according to a specific embodiment of the utility model Figure 10 ;

[0033] Fig.14 A schematic diagram of a single-point structure of a thermistor according to a specific embodiment of the utility model;

[0034] Fig.15 A linear structure schematic diagram of a thermistor according to a specific embodiment of the utility model;

[0035] Fig.16 A schematic diagram of a network structure of a thermistor according to a specific embodiment of the utility model;

[0036] Fig.17 The figure is a block diagram of an electric device according to an embodiment of the utility model. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] The intelligent power module and the electrical equipment proposed by the present invention are described below with reference to the accompanying drawings.

[0039] In the related technologies, there are currently two main solutions for over-temperature protection of intelligent power modules:

[0040] Solution 1: Integrate the temperature detection function into the driver chip of the intelligent power module, and detect the current temperature of the intelligent power module through the temperature detection unit inside the driver chip. When it is determined that the temperature detected by the temperature detection unit exceeds the set value, the output function of the drive signal inside the driver chip is automatically turned off to achieve over-temperature protection for the intelligent power module;

[0041] Solution 2: Install a thermistor inside the intelligent power module, and the thermistor is not connected to the input and output ports of the driver chip. By applying voltage externally, the resistance information of the thermistor is converted into voltage information and fed back to the external MCU. The external MCU determines the module temperature based on the voltage information. When it is determined that the module temperature exceeds the set value, the external MCU sends a shutdown signal, so that the control module stops working, achieving the purpose of over-temperature protection.

[0042] However, the temperature detection unit in Scheme 1 is located at the driver chip and can only detect the temperature at the location of the driver chip. In the intelligent power module, the most serious heat generation is often in the power part, and the heat generation in the driver chip part is relatively small. Therefore, Scheme 1 cannot accurately detect the actual temperature of the intelligent power module.

[0043] In solution 2, although the thermistor is installed inside the intelligent power module, its electrical connection is actually independent of other circuits. Therefore, an external MCU is required to implement the module protection function. This method has the problem of slow response speed. When an overheating event occurs in the intelligent power module, when the shutdown signal of the MCU is transmitted to control the intelligent power module to stop working, the temperature inside the module may have further increased to a level that can damage the device, causing damage to the device inside the module and reducing the over-temperature protection performance. In addition, when using solution 2, the intelligent power module needs to add 1 to 2 additional pins for connecting to the external MCU, which increases the hardware cost.

[0044] In order to solve the above technical problems, the present application proposes an intelligent power module, in which an over-temperature protection circuit is connected to a first enable terminal of the intelligent power module, a negative terminal of a low-voltage power supply, and a second enable terminal and ground of a driver chip. The over-temperature protection circuit detects the temperature of the intelligent power module and outputs a corresponding voltage to the second enable terminal with the cooperation of an auxiliary detection circuit, thereby realizing module temperature detection, and directly applies the voltage change caused by temperature change to the second enable terminal, thereby improving the reaction speed of over-temperature protection and the safety and reliability of module operation. At the same time, the circuit connection can be made based on the original ports of the intelligent power module and the driver chip without the need to add additional ports, thereby reducing the application cost and circuit complexity. The over-temperature protection circuit is independent of the driver chip and can be flexibly set.

[0045] The intelligent power module of the present utility model is described in detail below with reference to the accompanying drawings.

[0046] like Figure 1 As shown, the intelligent power module 100 of the present invention may include: a first enable terminal FLT / EN1 and a negative terminal VSS of a low-voltage power supply, a driver chip 20 and an over-temperature protection circuit 30 .

[0047] The first enable terminal FLT / EN1 is suitable for connecting the auxiliary detection circuit 10. The driver chip 20 has a second enable terminal FLT / EN2 and a ground terminal GND. The first terminal of the over-temperature protection circuit 30 is connected to the first enable terminal FLT / EN1, the second terminal of the over-temperature protection circuit 30 is connected to the second enable terminal FLT / EN2, and the third terminal of the over-temperature protection circuit 30 is respectively connected to the negative terminal VSS of the low-voltage area power supply and the ground terminal GND; wherein the auxiliary detection circuit 10 cooperates with the over-temperature protection circuit 30 to detect the temperature of the intelligent power module 100 and outputs the corresponding voltage VEN to the second enable terminal FLT / EN2.

[0048] Specifically, combined Figure 1 and Figure 2 As shown, the first enable terminal FLT / EN1 of the intelligent power module 100 is the control signal input port of the intelligent power module, which is used to control the switching state of the intelligent power module 100. For example, when the first enable terminal FLT / EN1 receives a high-level signal, the intelligent power module 100 can be controlled to be in a working state; when the first enable terminal FLT / EN1 receives a low-level signal, the intelligent power module 100 can be controlled to be in a shutdown state. Therefore, the function of the first enable terminal FLT / EN1 is to control the start and stop of the intelligent power module 100, thereby realizing the control and protection of the circuit. The first enable terminal FLT / EN1 is usually connected to an external controller or a microprocessor (such as Figure 3 The MCU200 shown in the figure controls the level state of the first enable terminal FLT / EN1 through the output signal of the controller or the microprocessor, thereby controlling the switching state of the intelligent power module 100.

[0049] In the present invention, the first enable terminal FLT / EN1 is suitable for connecting the auxiliary detection circuit 10, and the auxiliary detection circuit 10 is used to cooperate with the over-temperature protection circuit 30 to detect the temperature of the intelligent power module 100 and output the corresponding voltage VEN to the second enable terminal FLT / EN2. Among them, the auxiliary detection circuit 10 can be a voltage providing circuit, which is used to provide a target voltage to the first enable terminal FLT / EN1, and at the same time provide an operating voltage to the over-temperature protection circuit 30 to start it to operate, so as to cooperate with the over-temperature protection circuit 30 to detect the temperature of the intelligent power module 100 and output the corresponding voltage VEN to the second enable terminal FLT / EN2, and control the driver chip 20. In addition, in addition to providing an operating voltage to the over-temperature protection circuit 30, the auxiliary detection circuit 10 can also jointly construct a feedback circuit with it to cooperate with the over-temperature protection circuit 30 to detect the temperature of the intelligent power module 100, and output the corresponding voltage VEN to the second enable terminal FLT / EN2 based on the constructed feedback circuit. For example, the auxiliary detection circuit 10 may include a voltage source and a load element, the voltage source is connected to the first enable terminal FLT / EN1 through the load element, the over-temperature protection circuit 30 includes a temperature sensing component, such as a thermistor, a semiconductor temperature sensor, etc., the power supply end of the temperature sensing component is connected to the first enable terminal FLT / EN1 and the second enable terminal FLT / EN2, and the ground end of the temperature sensing component is connected to the negative terminal VSS of the low-voltage area power supply and the ground terminal GND. Thus, the load element and the temperature sensing component constitute a voltage divider circuit to output a corresponding voltage VEN to the second enable terminal FLT / EN2 as the temperature in the module changes.

[0050] The second enable terminal FLT / EN2 of the driver chip 20 is a control signal input port of the driver chip 20, which is used to control the working state of the driver chip 20. For example, when the second enable terminal FLT / EN2 receives a high level signal, the driver chip 20 can be controlled to be in a working state so that the intelligent driver module 100 works; when the second enable terminal FLT / EN2 receives a low level signal, the driver chip 20 can be controlled to be in a closed state so that the intelligent driver module 100 does not work. Therefore, the function of the second enable terminal FLT / EN2 is to control the start and stop of the driver chip 20 to achieve the start and stop control of the intelligent driver module 100, thereby realizing the control and protection of the module. Therefore, the over-temperature protection circuit 30 detects the temperature of the intelligent power module 100 and outputs the corresponding voltage VEN to the second enable terminal FLT / EN2, which can directly control the start and stop of the driver chip 20, thereby controlling the working state of the intelligent power module 100, and improving the reaction speed of the over-temperature protection.

[0051] The intelligent power module 100 of the utility model closely links the temperature detection and over-temperature protection functions together. Since the voltage change caused by the temperature change of the module directly acts on the second enable terminal FLT / EN2, the over-temperature signal is directly transmitted to the enable port, so that the over-temperature protection reacts quickly and the module operates safely and reliably. At the same time, the over-temperature protection circuit 30 is directly connected to the original port of the intelligent power module 100, without the need to add additional pins, and the over-temperature protection circuit 30 is also directly connected to the original port of the driver chip 20, without the need to add an additional temperature detection port to the driver chip 20, thereby reducing the complexity of the circuit and the application cost.

[0052] Further, such as Figure 2 As shown, the intelligent power module 100 also includes a power part 40, which is composed of six power switch tubes. The driver chip 20 is used to convert the logic signals received by the input terminals HIN1, HIN2, HIN3 and LIN1, LIN2, LIN3, and control the power switch tubes through ports HO1, HO2, HO3 and LO1, LO2, LO3. Among them, the power part 40 is the high temperature part of the intelligent power module 100, and the over-temperature protection circuit 30 is an independent temperature detection unit, and its position can be adjusted according to the needs. For example, the over-temperature protection circuit 30 can be installed at a position close to the power part 40 to detect the module temperature more accurately.

[0053] In one embodiment of the present application, the second enable terminal FLT / EN2 has a high-level threshold voltage TPH and a low-level threshold voltage TPL. When the voltage VEN is greater than the high-level threshold voltage TPH, the second enable terminal FLT / EN2 generates a first enable signal. When the voltage VEN is less than the low-level threshold voltage TPL, the second enable terminal FLT / EN2 generates a second enable signal.

[0054] Specifically, the over-temperature protection circuit 30 detects the temperature of the intelligent power module 100 and outputs a corresponding voltage VEN which may increase or decrease as the temperature increases, and there is no specific limitation thereto.

[0055] When the voltage VEN increases with the increase of temperature, the first enable signal serves as an over-temperature protection signal of the intelligent power module 100, and is used to control the driver chip 20 to stop working, so as to control the intelligent driver module 100 to stop working; the second enable signal serves as an over-temperature protection recovery signal of the intelligent power module 100, and is used to control the driver chip 20 to start working, so as to control the intelligent driver module 100 to resume working.

[0056] When the voltage VEN decreases with increasing temperature, the first enable signal serves as an over-temperature protection recovery signal of the intelligent power module 100, and is used to control the driver chip 20 to start working, so as to control the intelligent driver module 100 to start working; the second enable signal serves as an over-temperature protection signal of the intelligent power module 100, and is used to control the driver chip 20 to stop working, so as to control the intelligent driver module 100 to stop working.

[0057] During operation, based on the magnitude relationship between the voltage VEN output by the over-temperature protection circuit 30 and the high-level threshold voltage TPH and the low-level threshold voltage TPL, a corresponding enable signal is generated to control the driver chip 20. For example, when VEN>VENH, a first enable signal is generated to control the driver chip 20 and the intelligent driver module 100 to stop working; when the module temperature drops to TPL, that is, VEN<VEL, a second enable signal is output to control the driver chip 20 and the intelligent driver module 100 to resume normal operation.

[0058] Combination Figure 3 As shown, in one embodiment of the present invention, the auxiliary detection circuit 10 includes: an auxiliary resistor R0, which is connected in series between the first power supply V1 and the first enable terminal FLT / EN1. The first power supply V1 can be selected according to actual conditions, and the auxiliary resistor R0 is a fixed resistance value.

[0059] In one embodiment of the present application, the over-temperature protection circuit 30 includes: a thermistor R, one end of the thermistor R is respectively connected to the first enable terminal FLT / EN1 and the second enable terminal FLT / EN2, and the other end of the thermistor R is respectively connected to the negative terminal VSS of the low-voltage area power supply and the ground terminal GND.

[0060] Specifically, the thermistor R is a temperature-sensitive resistor device whose resistance value changes with temperature. The law of the change of the resistance value of thermistor R with temperature can be divided into two types: positive temperature coefficient (PTC) and negative temperature coefficient (NTC). Among them, the resistance value of the PTC thermistor increases with the increase of temperature, while the resistance value of the NTC thermistor decreases with the increase of temperature. The thermistor R is a passive device that does not provide any voltage or current information by itself. In actual application, it forms a circuit with a low-temperature drift resistor ( Figure 3 The auxiliary detection circuit 10 shown is pulled up to a power supply (generally 5V or 3.3V). During the temperature detection process, the resistance value of the thermistor R can be inferred by detecting the voltage division value of the thermistor R, and further the temperature value can be obtained.

[0061] In addition, the thermistor R serves as an independent temperature detection unit, and its position can be adjusted according to demand. If the thermistor R is installed near the power part, the module temperature can be detected more accurately. The use of thermistor R can reduce the complexity of the internal design of the driver chip 20 and further reduce the cost of the intelligent driver module.

[0062] by Figure 3 For example, the thermistor R uses an NTC thermistor, the first enable terminal FLT / EN1 is pulled up to the first power supply V1 through an auxiliary resistor R0 with a fixed resistance, one end of the thermistor R is connected to the first enable terminal FLT / EN1 and the second enable terminal FLT / EN2, and the other end of the thermistor R is connected to the negative terminal VSS of the low-voltage power supply and the ground terminal GND. The equivalent resistance of the enable port in the normal state is above several hundred megohms, which is equivalent to an open circuit, and its shunt effect can be ignored. At this time, the calculation formula of the voltage VEN is:

[0063]

[0064] At this time, the voltage value corresponding to the over-temperature protection temperature of the intelligent power module 100, that is, the high-level threshold voltage TPH, can be set, and the voltage value corresponding to the over-temperature protection recovery temperature, that is, the low-level threshold voltage TPL. By selecting the thermistor R with a suitable temperature coefficient and a suitable auxiliary resistor R0, it can be achieved that when the voltage VEN rises to TPH, the control module stops working; when the voltage VEN drops to TPL, the control module resumes normal operation.

[0065] In addition, Figure 3 The configuration of the over-temperature protection circuit 30 shown can also select different circuit connections according to the temperature range of concern and the required detection voltage range to improve the voltage-temperature slope in a certain range to improve the detection accuracy.

[0066] For example, in one embodiment of the present application, Figure 4 As shown, the over-temperature protection circuit 30 further includes: a first resistor R1, which is connected in series between the first enable terminal FLT / EN1 and one end of the thermistor R. At this time, the over-temperature protection circuit 30 outputs a voltage VEN to the second enable terminal FLT / EN2, and the calculation formula is:

[0067] For example, in one embodiment of the present application, the over-temperature protection circuit 30 further includes: a second resistor R2, and the second resistor R2 is connected to the thermistor R in parallel or in series.

[0068] Specifically, in Figure 5 and Figure 6 In the embodiment shown, relative to Figure 4A second resistor R2 is added, and the over-temperature protection circuit 30 outputs a voltage VEN to the second enable terminal FLT / EN2, which is a voltage divided by the second resistor R2 and the thermistor R branch. Figure 5 In the embodiment where the second resistor R2 is connected in series with the thermistor R, the voltage VEN is calculated as: exist Figure 6 In the embodiment where the second resistor R2 is connected in parallel with the thermistor R, the voltage VEN is calculated as:

[0069]

[0070] For example, combined Figure 7 and Figure 8 As shown, in one embodiment of the present utility model, the over-temperature protection circuit 30 further includes: a second resistor R2 and a third resistor R3, the second resistor R2 and the thermistor R are connected in series and then connected in parallel with the third resistor R3, or the third resistor R3 and the thermistor R are connected in parallel and then connected in series with the second resistor R2.

[0071] Specifically, in Figure 7 In the embodiment of the present invention, the second resistor R2 and the thermistor R are connected in series and then connected in parallel with the third resistor R3. Figure 5 A third resistor R3 is added in parallel. Figure 8 In the embodiment of the present invention, the third resistor R3 is connected in parallel with the thermistor R and then connected in series with the second resistor R2. Figure 6 , a series resistor R3 is added, and the specific voltage calculation formula is not repeated here.

[0072] In one embodiment of the present application, the over-temperature protection circuit 30 includes: a thermistor R and a fourth resistor R4, one end of the thermistor R is connected to the first enable terminal FLT / EN1, the other end of the thermistor R is connected to the second enable terminal FLT / EN2, one end of the fourth resistor R4 is respectively connected to the other end of the thermistor R and the second enable terminal FLT / EN2, and the other end of the fourth resistor R4 is respectively connected to the negative terminal VSS of the low-voltage area power supply and the ground terminal GND.

[0073] Specifically, the auxiliary detection circuit 10 is Figure 3 For example, the thermistor R adopts an NTC thermistor, the first enable terminal FLT / EN1 is pulled up to the first power supply V1 through an auxiliary resistor R0 with a fixed resistance, one end of the thermistor R is connected to the first enable terminal FLT / EN1, and the other end is connected to the second enable terminal FLT / EN2 and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the negative terminal VSS of the low-voltage area power supply and the ground terminal GND.

[0074] At this time, the voltage VEN output by the over-temperature protection circuit 30 can be calculated by the following formula:

[0075]

[0076] At this time, the voltage value corresponding to the over-temperature protection temperature of the intelligent power module 100, that is, the high-level threshold voltage TPH, can be set, and the voltage value corresponding to the over-temperature protection recovery temperature, that is, the low-level threshold voltage TPL. By selecting the thermistor R with a suitable temperature coefficient and the appropriate auxiliary resistor R0 and the fourth resistor R4, it can be achieved that when the voltage VEN rises to TPH, the control module stops working; when the voltage VEN drops to TPL, the control module resumes normal operation.

[0077] In addition, the over-temperature protection circuit 30 Fig. 9 In the circuit connection mode shown in FIG. 1 , a fifth resistor R5 may be added, such as Fig.10 As shown, the fifth resistor R5 is connected in series with the thermistor R, or as Fig.11 As shown, the fifth resistor R5 is connected in parallel with the thermistor R; the fifth resistor R5 and the sixth resistor R6 may also be added, such as Fig.12 As shown, the fifth resistor R5 and the thermistor R are connected in series and then connected in parallel with the sixth resistor R6, or as shown in Fig.13 As shown, the sixth resistor R6 and the thermistor R are connected in parallel and then in series with the fifth resistor R5, and the specific connection method is not limited.

[0078] In one embodiment of the present application, the thermistor R includes a plurality of thermistors R, and the plurality of thermistors R are connected in series and / or in parallel.

[0079] That is to say, in addition to adopting Fig.14 In addition to the single-point structure shown, that is, a single thermistor R is connected to the circuit to measure the temperature of a single location, multiple thermistors R can also be combined to enhance the accuracy and reliability of the measurement, for example, Fig.15 The linear structure shown connects multiple thermistors R in series to measure the temperature change along a line; Fig.16 The mesh structure shown connects multiple thermistors R in parallel to measure the average temperature in an area. In addition, the above structure can be used alone or in combination of two or more, without specific limitation.

[0080] In summary, according to the intelligent power module of the utility model, the driver chip has a second enable terminal and a ground terminal; the over-temperature protection circuit, the first end of the over-temperature protection circuit is connected to the first enable terminal of the intelligent power module, the second end of the over-temperature protection circuit is connected to the second enable terminal of the driver chip, the third end of the over-temperature protection circuit is respectively connected to the negative end of the low-voltage area power supply of the intelligent power module and the ground terminal of the driver chip, and the auxiliary detection circuit cooperates with the over-temperature protection circuit to detect the temperature of the intelligent power module and output the corresponding voltage to the second enable terminal. Therefore, the over-temperature protection circuit in the intelligent power module realizes module temperature detection based on the auxiliary detection circuit, and directly acts the voltage change caused by the temperature change on the second enable terminal, which improves the reaction speed of the over-temperature protection and the safety and reliability of the module. At the same time, the circuit connection can be based on the original ports of the intelligent power module and the driver chip, without adding additional ports, reducing the application cost and circuit complexity.

[0081] Corresponding to the above-mentioned embodiment, the utility model also proposes an electrical device.

[0082] like Fig.17 As shown, the utility model proposes an electric device 1000, including the above-mentioned intelligent power module 100. The electric device 1000 refers to an electric device that converts electric energy into other forms of energy, such as a compressor, an air conditioner, a refrigerator, etc.

[0083] According to the electrical equipment of the embodiment of the utility model, based on the above-mentioned intelligent power module, the reaction speed of over-temperature protection and the safety and reliability of equipment operation are improved.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0085] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0086] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An intelligent power module, characterized in that: include: A first enabling terminal and a negative terminal of a low-voltage area power supply, wherein the first enabling terminal is suitable for connecting an auxiliary detection circuit; A driving chip, wherein the driving chip has a second enabling terminal and a ground terminal; An over-temperature protection circuit, wherein the first end of the over-temperature protection circuit is connected to the first enable end, the second end of the over-temperature protection circuit is connected to the second enable end, and the third end of the over-temperature protection circuit is respectively connected to the negative end of the low-voltage area power supply and the ground end; wherein the auxiliary detection circuit cooperates with the over-temperature protection circuit to detect the temperature of the intelligent power module and outputs a corresponding voltage to the second enable end.

2. The module according to claim 1, characterized in that The second enable terminal has a high level threshold voltage and a low level threshold voltage. When the voltage is greater than the high level threshold voltage, the second enable terminal generates a first enable signal. When the voltage is less than the low level threshold voltage, the second enable terminal generates a second enable signal.

3. The module according to claim 1, characterized in that The over-temperature protection circuit includes: a thermistor, one end of the thermistor is respectively connected to the first enable end and the second enable end, and the other end of the thermistor is respectively connected to the negative end of the low-voltage area power supply and the ground end.

4. The module according to claim 3, characterized in that The over-temperature protection circuit further includes: a first resistor, which is connected in series between the first enabling terminal and one end of the thermistor.

5. The module according to claim 4, characterized in that The over-temperature protection circuit also includes: a second resistor, the second resistor being connected in parallel or in series with the thermistor; or A second resistor and a third resistor, wherein the second resistor and the thermistor are connected in series and then connected in parallel with the third resistor, or the third resistor and the thermistor are connected in parallel and then connected in series with the second resistor.

6. The module according to claim 1, characterized in that The over-temperature protection circuit includes: a thermistor and a fourth resistor, one end of the thermistor is connected to the first enable end, the other end of the thermistor is connected to the second enable end, one end of the fourth resistor is respectively connected to the other end of the thermistor and the second enable end, and the other end of the fourth resistor is respectively connected to the negative end of the low-voltage area power supply and the ground end.

7. The module according to claim 6, characterized in that The over-temperature protection circuit also includes: a fifth resistor, the fifth resistor being connected in series or in parallel with the thermistor; or A fifth resistor and a sixth resistor, wherein the fifth resistor and the thermistor are connected in series and then connected in parallel with the sixth resistor, or the sixth resistor and the thermistor are connected in parallel and then connected in series with the fifth resistor.

8. The module according to any one of claims 1 to 7, characterized in that: The auxiliary detection circuit includes an auxiliary resistor, which is connected in series between a first power supply and the first enable terminal.

9. The module according to any one of claims 3 to 7, characterized in that: The thermistor includes a plurality of thermistors, and the plurality of thermistors are connected in series and / or in parallel.

10. An electrical device, characterized in that: Comprising an intelligent power module according to any one of claims 1-9.

Images