Power integration module

Abstract

The utility model relates to a power integration module, and belongs to the field of semiconductors. The module comprises a power switch unit, a current detection unit and a temperature detection unit of a refrigerating system and a heating system. Each power switch unit is connected in parallel with a protection diode so as to protect the switch from being damaged in the switching-on and switching-off processes. The utility model also comprises a packaging body and a substrate, the substrate is provided with a power integration module, the control end and the detection end of each module are led out to be connecting pins, and the packaging body contains silica gel or packaging resin to cover the power switch device. By integrating a plurality of single tubes and two sets of systems, the external connection complexity is reduced, the system reliability is improved, the working current is fed back through the current detection unit, and the problem that the voltage of a working part is too high or too low is avoided.

Description

Technical Field

[0001] The utility model relates to the field of semiconductors, in particular to a power integrated module. Background Art

[0002] The current mainstream electric vehicle air conditioning system consists of two independent systems: the heating system and the cooling system. The two systems operate independently, and are combined with single-tube discrete devices to achieve the corresponding control functions. At present, the air conditioning refrigeration system usually uses a full-bridge circuit composed of 6 TO epoxy-sealed single tubes arranged on the circuit board, and the air conditioning heating system uses a combination of 2-4 TO epoxy-sealed single tubes for control. If the drive circuits of the cooling and heating systems are arranged on a circuit board at the same time, no less than 8 epoxy-sealed single tubes are required, which will greatly occupy the space of the PCB circuit board, and the combination of multiple single tubes will also greatly increase the cost. If the two sets of drive circuits are set up independently, two electrical input terminals need to be configured, which increases the complexity of the external circuit connection, means more potential failure points, and reduces the reliability of the system.

[0003] At the same time, common automotive air conditioning refrigeration systems adjust the power of the compressor by changing the working state of the motor. Most air conditioners adjust the compressor power by adjusting the speed of the motor, which is variable frequency speed regulation technology. However, variable frequency speed regulation has the problems of complex technology and high price. Another method is to adjust the output power of the motor by adjusting the power supply voltage, but this method has certain risks, because too high or too low voltage may cause certain damage to the motor or refrigeration system. Utility Model Content

[0004] The utility model provides a power integrated module, which integrates multiple discrete devices, simplifies the circuit and reduces the circuit cost and complexity. By adding a current detection unit, the utility model can feedback the working current when used in an air-conditioning system to avoid the problem of over-high or under-voltage in working parts.

[0005] To achieve the purpose of the utility model, the utility model provides a power integrated module, which integrates a power switch device and a current detection unit; the power switch device includes a cooling power switch unit and a heating power switch unit, and the cooling power switch unit and / or the heating power switch unit includes at least two bridge arm structures; the bridge arm structure includes an upper bridge arm electric control switch and a lower bridge arm electric control switch; the upper bridge arm electric control switch and the lower bridge arm electric control switch are connected in series; the current detection unit is used to obtain the current flowing through the bridge arm structure, and one end of the current detection unit is connected to an end of the lower bridge arm electric control switch in the bridge arm structure away from the series connection.

[0006] Furthermore, the upper bridge arm electrically controlled switches of each bridge arm structure are electrically connected to each other at one end away from the corresponding series connection, and the lower bridge arm electrically controlled switches of each bridge arm structure are electrically connected to each other at one end away from the series connection.

[0007] Furthermore, any cooling power switch unit and any heating power switch unit include a protection diode to protect the cooling power switch unit or the heating power switch unit during the on-off switching process of the switch.

[0008] Preferably, the heating power switch unit includes at least two independent electrically controlled switches.

[0009] Furthermore, one end of the switch included in the cooling power switch unit and the heating power switch unit is at least led out as two connecting pins.

[0010] Furthermore, the utility model is also integrated with a temperature detection unit, and the temperature detection unit includes one of a thermistor, a diode temperature detection circuit, and a triode temperature detection circuit.

[0011] Furthermore, the utility model also includes a packaging body, which is used to package the power switch device, the temperature detection unit and the current detection unit.

[0012] Furthermore, the several switch control ends and switch action ends included in the cooling power switch unit and the heating power switch unit, the output end of the temperature detection unit, and the output end of the current detection unit are all led out as connection pins of the power integration module; and the end of each bridge arm structure where the upper bridge arm electric control switch is electrically connected to the lower bridge arm electric control switch is led out as an output pin of the power integration module.

[0013] Furthermore, it also includes a substrate and an electrode for external circuit connection; the power switching device is arranged on the substrate; the substrate includes an electrical insulator and a metal base island, and the metal base island is laid on the front and / or back of the electrical insulator for supporting and fixing the power switching device and dissipating heat; one end of the electrode is connected to its corresponding connecting pin, and the other end of the electrode extends to the outside of the silicon package.

[0014] Preferably, the packaging body is silicone gel or packaging resin; the silicone gel or packaging resin covers the power switch device.

[0015] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0016] Integrating multiple single tubes on a circuit board reduces the space occupied by the chip on the PCB board and reduces costs; the integration of the two control systems for cooling and heating enables the two electrical input terminals to be integrated, reducing the complexity of external circuit connections and improving the reliability of the system; by adding a current detection unit, the working current can be fed back in real time when used in the air-conditioning system, avoiding problems with over-high or under-voltage in the working parts and improving the working stability of the working parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A circuit schematic diagram of a power integrated module according to an embodiment of the utility model;

[0018] Figure 2 It is a topological diagram of the packaging structure of an embodiment of the utility model;

[0019] Figure 3 It is a cross-sectional view of an embodiment of the utility model;

[0020] Figure 4 The figure is a schematic diagram of the packaging structure and pins of an embodiment of the utility model.

[0021] In the above drawings:

[0022] 1. Cooling power switch unit; 2. Heating power switch unit; 3. Temperature detection unit; 4. Current detection unit; 5. IGBT; 6. FRD; 7. Ceramic board; 8. Front copper clad board; 9. Back copper clad board; 10. Binding wire; 11. Silicone gel packaging structure; 12. Electrode. DETAILED DESCRIPTION

[0023] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The exemplary embodiments can be implemented in various forms and should not be understood as being limited to the examples set forth herein; on the contrary, these embodiments are provided so that the utility model will be more comprehensive and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. 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 only used to explain the present invention, and should not be understood as limiting the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" 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, and it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] This embodiment provides a power integrated module, which integrates a power switch device, a temperature detection unit 3 and a current detection unit 4. The circuit schematic diagram of the power integrated module is shown in FIG. Figure 1 As shown; the power switch device includes a cooling power switch unit 1 and a heating power switch unit 2. The cooling power switch unit 1 and / or the heating power switch unit 2 include at least two bridge arm structures, wherein each bridge arm structure includes an upper bridge arm electric control switch and a lower bridge arm electric control switch. In order to meet the driving requirements of the three-phase motor, in this embodiment, only the cooling power switch unit 1 of the power switch device has a bridge arm structure, and the number of bridge arm structures is three. Each bridge arm is responsible for controlling one phase current, thereby realizing the effective driving of the three-phase motor. The upper bridge arm electric control switch and the lower bridge arm electric control switch included in each bridge arm unit constitute an upper bridge control switch and a lower bridge control switch, and the upper bridge arm electric control switch and the lower bridge arm electric control switch are connected in series. One end of the current detection unit 4 is connected to the end of the upper bridge arm electric control switch or the lower bridge arm electric control switch in the bridge arm structure away from the series connection. The current detection unit 4 is a current detection resistor, and the two ends of the current detection resistor are connected to an independently set current detection circuit.

[0026] A current detection circuit embodiment of the utility model is a current-voltage conversion circuit composed of an operational amplifier. This circuit uses a differential operational amplifier for gain amplification and shifts the signal level from the high end to the output, wherein the two ends of the current detection resistor are respectively connected to the two input ends of the amplifier.

[0027] In another embodiment provided by the utility model, an integrated circuit solution MAX4198 / 99 module is used to implement current detection, and the module contains all functional units for completing current detection. The two input ends of the MAX4198 / 99 module are respectively connected to the two ends of the current sensing resistor, and the output end of the module is grounded as a reference point. The output end provides a current signal proportional to the voltage drop on the current sensing resistor for effectively monitoring the current.

[0028] By adding the current detection unit 4, the utility model can monitor the current change in real time, and prevent the compressor of the air-conditioning refrigeration system from being damaged due to excessively high or low voltage.

[0029] The temperature detection unit 3 of the utility model includes one of a thermistor, a diode temperature detection circuit, and a transistor temperature detection circuit, and its two ends are used for an external drive circuit to detect and adjust the module temperature to prevent the chip or module from overheating. Figure 1As shown, the external driving circuit connected to both ends of the thermistor provides a constant current to the thermistor through a constant current source, and the voltage across the thermistor changes with temperature. The external detection circuit can determine the temperature of the module by measuring the voltage of the thermistor, and adjust the working state of the thermistor of the driving circuit according to the temperature change to prevent the chip or module from overheating. In other embodiments, the thermistor included in the temperature monitoring module 3 can be replaced by a diode or a triode.

[0030] The upper bridge arm electrically controlled switches of each bridge arm structure of the utility model are electrically connected to each other at one end away from the corresponding series connection, and / or the lower bridge arm electrically controlled switches of each bridge arm structure are electrically connected to each other at one end away from the series connection; the electrically connected ends of the upper bridge arm electrically controlled switches and / or the lower bridge arm electrically controlled switches of each bridge arm structure are led out as connection pins of the power integrated module.

[0031] In one embodiment, the upper bridge arm electrically controlled switches of each bridge arm structure of the utility model are electrically connected to each other at one end away from the corresponding series connection; the lower bridge arm electrically controlled switches of each bridge arm structure are electrically connected to each other at one end away from the series connection; and the ends at which the upper bridge arm electrically controlled switches and the lower bridge arm electrically controlled switches of each bridge arm structure are electrically connected are led out as connection pins of a power integrated module.

[0032] In another embodiment, the lower bridge arm electric control switches of each bridge arm structure are electrically connected at one end away from the series connection; and the electrically connected end of the lower bridge arm electric control switches of each bridge arm structure is led out as a connection pin of the power integration module.

[0033] Any cooling power switch unit 1 and any heating power switch unit 2 include a protection diode, which is connected in parallel with the switch action end to protect the cooling power switch unit 1 or the heating power switch unit 2 during the switch on-off switching process. At least one end of the switch included in the cooling power switch unit 1 and the heating power switch unit 2 is led out as two connection pins of the power integrated module.

[0034] In this embodiment, any cooling power switch unit 1 and any heating power switch unit 2 are IGBT 5, and a FRD 6 (fast recovery diode) is connected between the collector and emitter of any IGBT 5. The IGBT 5 and the FRD 6 are actually installed in a power integrated module such as Figure 2 As shown. The gate of IGBT 5 is the switch control terminal that receives the control signal; the collector of IGBT 5 is its power supply terminal; and the emitter of IGBT 5 is the switch action terminal. The connection method of each chip and its corresponding pin is as shown in Figure 1 As shown, each switch control end in the power integrated module is respectively connected to its corresponding connection pin (G1-G7), and each switch action end is respectively connected to its corresponding connection pin (E1-E9).

[0035] The heating power switch unit 2 includes at least two independent electronically controlled switches. The heating control system needs to handle larger current and power. In order to better distribute the current and power load and reduce the burden of a single switch, three independent electronically controlled switches are used in this embodiment. The power supply end of any three independent electronically controlled switches is connected to the positive pole of the power supply; the switch action end of any three independent electronically controlled switches is connected to one end of the output pin terminal of the PTC heater, and the other end of the output pin terminal of the PTC heater is grounded, so that a voltage drop can be formed at both ends of the PTC heater when the independent electronically controlled switch is in the on state, generating current to flow through the PTC heater to generate heat.

[0036] In this embodiment, multiple discrete devices are integrated into one module, thereby reducing the number of individual components, lowering material and manufacturing costs, and reducing the number of components on the PCB circuit board through integrated design, thereby saving space and making the circuit design more compact.

[0037] The utility model also includes a packaging structure of a power integrated module, including a packaging body, wherein the packaging body is used to package a power switch device, a temperature detection unit 3 and a current detection unit 4. The thickness of the packaging body in this embodiment does not exceed the height of the power pin.

[0038] The switch control terminals and switch action terminals included in the cooling power switch unit 1 and the heating power switch unit 2, the output terminal of the temperature detection unit 3, and the output terminal of the current detection unit 4 are all led out as the connection pins of the power integrated module. The ends of the upper bridge arm electric control switches and / or the lower bridge arm electric control switches of each bridge arm structure that are electrically connected are led out as the connection pins of the power integrated module.

[0039] The package is used to package a power integrated module arranged on a substrate; the substrate includes an electrical insulation layer and a metal base island. The metal base island is laid on the front and / or back of the electrical insulation layer; the metal base island is used to carry and fix the power switch device and increase the heat dissipation area of ​​the power switch device.

[0040] The cross-sectional view of this embodiment is as follows Figure 3 As shown, it includes a ceramic board 7, a front copper-clad board 8, a back copper-clad board 9 and an electrode 12. The front and back of the ceramic board 7 are paved with copper-clad boards; the back copper-clad board 9 is used to evenly conduct the heat generated during the working process of the power switch device to the heat dissipation device; the front copper-clad board 8 forms an etched structure according to the topology of the driving circuit and is divided into different frames for connecting each module. Figure 2: is a circuit topology diagram of the power integrated module of this embodiment, wherein the IGBT 5 and FRD 6 included in the power switch device are soldered to the copper clad board using solder sheets and a reflow soldering process to form a reliable electrical connection; one end of the electrode 12 is connected to its corresponding connection pin on the front copper clad board 8, and the other end of the electrode 12 extends to the outside of the silicone gel packaging structure 11 for external circuit connection. The packaging body structure and pin schematic diagram are shown in FIG. Figure 4 shown.

[0041] like Figure 3 As shown, the package body contains silicone gel; the silicone gel covers the power switch device. The binding wire 10 provided in this embodiment for electrical connection between the metal base island or the lead frame and each switch unit is an aluminum wire; there is a silicone gel packaging structure 11 formed by filling just above the front copper clad plate 8, which is used to protect the chip and other circuit structures inside the module;

[0042] The integrated module design reduces the number of external circuit connections, reduces potential failure points, and improves the overall reliability of the system. The integrated design simplifies circuit wiring and connections, and reduces the complexity of design and debugging.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A power integrated module, integrating a power switch device, characterized in that: A current detection unit is also integrated; the power switch device includes a cooling power switch unit and a heating power switch unit, and the cooling power switch unit and / or the heating power switch unit includes at least two bridge arm structures; the bridge arm structure includes an upper bridge arm electric control switch and a lower bridge arm electric control switch; The upper bridge arm electric control switch is connected in series with the lower bridge arm electric control switch; the current detection unit is used to obtain the current flowing through the bridge arm structure, and one end of the current detection unit is connected to the end of the lower bridge arm electric control switch in the bridge arm structure away from the series connection.

2. A power integrated module according to claim 1, characterized in that: The upper bridge arm electric control switch of each bridge arm structure is electrically connected to one end away from the corresponding series connection, and the lower bridge arm electric control switch of each bridge arm structure is electrically connected to one end away from the series connection.

3. A power integrated module according to claim 1, characterized in that: Any cooling power switch unit and any heating power switch unit include a protection diode to protect the cooling power switch unit or the heating power switch unit during the on-off switching process of the switch.

4. A power integrated module according to claim 1, characterized in that: The heating power switch unit includes at least two independent electronically controlled switches.

5. The power integrated module according to claim 1, characterized in that: At least one end of the upper bridge arm electric control switch and the lower bridge arm electric control switch included in the cooling power switch unit and the heating power switch unit is led out as two connecting pins.

6. A power integrated module according to any one of claims 2 to 5, characterized in that: A temperature detection unit is also integrated, and the temperature detection unit includes one of a thermistor, a diode temperature detection circuit, and a triode temperature detection circuit.

7. A power integrated module according to any one of claims 2 to 5, characterized in that: The invention also comprises a packaging body, wherein the packaging body is used to package the power switch device, the temperature detection unit and the current detection unit.

8. A power integrated module according to claim 7, characterized in that: The output ends of the cooling power switch unit, the heating power switch unit, the temperature detection unit and the current detection unit are all led out as connection pins of the power integrated module; one end of each bridge arm structure where the upper bridge arm electric control switch is electrically connected to the lower bridge arm electric control switch is led out as an output pin.

9. A power integrated module according to claim 8, characterized in that: It also includes a substrate; the power switch device is arranged on the substrate; the substrate includes an electrical insulator and a metal base island, and the metal base island is laid on the front and / or back of the electrical insulator for supporting and fixing the power switch device and dissipating heat.

10. A power integrated module according to claim 9, characterized in that: The packaging body is silicone gel or packaging resin; the silicone gel or packaging resin covers the power switch device.

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