Multifunctional intelligent power system

Abstract

The invention relates to the technical field of intelligent power modules, and provides a multifunctional intelligent power system which comprises an intelligent power module and a voltage sampling circuit electrically connected with the intelligent power module. The intelligent power module is provided with an input ITIRP port and an output UVW port, and the input ITIRP port and the output UVW port are arranged adjacently; the input end of the voltage sampling circuit is connected with the input ITIRP port and the output UVW port, and the voltage sampling circuit is used for collecting voltage signals of the intelligent power module and outputting the voltage signals to external equipment through the output end of the voltage sampling circuit. According to the multifunctional intelligent power system, the number of pins is small, the fault sampling distance is shortened, interference sources are reduced, and a product can operate more reliably and has higher market competitiveness.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent power modules, and in particular to a multifunctional intelligent power system. Background Art

[0002] Intelligent Power Module (IPM) is a power drive product that combines power electronics and integrated circuit technology. It has the advantages of high current, low saturation voltage and high withstand voltage of GTR (high power transistor), and the advantages of high input impedance, high switching frequency and low driving power of MOSFET (field effect transistor). In addition, IPM integrates logic, control, detection and protection circuits, which is easy to use. It not only reduces the size of the system and shortens the development time, but also enhances the reliability of the system, adapting to the development direction of today's power devices.

[0003] The traditional IPM solution is generally composed of a single unit, that is, 6-way drive three-phase, single control mode, and complex control scheme, resulting in a large PCB board design area, waste of resources, and difficulty in meeting the needs of industrial development, especially with the acceleration of global intelligence and the full promotion of full DC motor control mode. The shortcomings of traditional intelligent power modules are particularly prominent, such as low integration, single control, and a large number of devices. Integrated intelligent power modules are an inevitable trend, with better adaptability. By optimizing the drive mode, they can effectively improve drive efficiency and reduce costs.

[0004] Therefore, the intelligent power module is used in high-voltage and high-current scenarios with a complex application environment. It also has an internally integrated HVIC with an overcurrent detection terminal and a trigger threshold of about 0.4-0.5V, which is prone to false triggering failures. In existing power modules, the ITRIP (overcurrent detection port) is designed to be far away from the sampling point, resulting in long wiring in the module's peripheral circuits, which is prone to parasitic inductance, resulting in inaccurate collection and poor reliability. Summary of the invention

[0005] The present invention provides a multifunctional intelligent power system, aiming to solve the problem that the existing intelligent power module has a long circuit wiring in the peripheral circuit of the module, which is easy to generate parasitic inductance, resulting in inaccurate collection and poor reliability.

[0006] An embodiment of the present invention provides a multifunctional intelligent power system, comprising: an intelligent power module and a voltage sampling circuit electrically connected to the intelligent power module; the intelligent power module is provided with an input ITIRP port and an output UVW port, and the input ITIRP port is adjacent to the output UVW port; the input end of the voltage sampling circuit is respectively connected to the input ITIRP port and the output UVW port, for collecting a voltage signal of the intelligent power module, and outputting the voltage signal to an external device through the output end of the voltage sampling circuit.

[0007] Preferably, the voltage sampling circuit includes: a sampling resistor, a first resistor, a filtering circuit, a comparator and a control circuit; the first end of the sampling resistor is connected to the first end of the first resistor and serves as the input end of the voltage sampling circuit, the first end of the sampling resistor is connected to the output UVW port, and the second end of the sampling resistor is grounded; the second end of the first resistor is respectively connected to the input ITIRP port and the input end of the filtering circuit, the output end of the filtering circuit is connected to the negative input end of the comparator, the positive input end of the comparator is used to connect the threshold voltage, the comparator is also connected to a power supply, the output end of the comparator is connected to the input end of the control circuit, and the output end of the control circuit is connected to the external device as the output end of the voltage sampling circuit.

[0008] Preferably, the filtering circuit includes a second resistor and a first capacitor, the first end of the second resistor serves as the input end of the filtering circuit, the second end of the second resistor is connected to the first end of the first capacitor and serves as the output end of the filtering circuit, and the second end of the first capacitor is grounded.

[0009] Preferably, the control circuit includes a third resistor, a fourth resistor and a first MOS tube; the first end of the third resistor serves as the input end of the control circuit, the second end of the third resistor is connected to the gate of the first MOS tube, the source of the first MOS tube is connected to the first end of the fourth resistor, the second end of the fourth resistor is grounded, and the drain of the first MOS tube serves as the output end of the control circuit.

[0010] Preferably, the intelligent power module comprises: an inverter part, a PFC control part, a driver IC chip part, a bootstrap part and a rectifier;

[0011] The first end of the inverter part is used to connect to the power supply, the second end of the inverter part is used to connect to the driver IC chip part, and the third end of the inverter part is connected to the output UVW port;

[0012] The PFC control part is used to connect the power supply and the driver IC chip part; the first end of the bootstrap part is respectively connected to the second end of the inverter part and the driver IC chip part, and the second end of the bootstrap part is used to connect the bias voltage;

[0013] The rectifier is used to connect to an AC power source and rectify and output the AC power source to form the power supply.

[0014] Compared with the prior art, the beneficial effect of the present invention is that, by providing an input ITIRP port and an output UVW port in the intelligent power module, the input ITIRP port and the output UVW port are arranged adjacent to each other; the input end of the voltage sampling circuit is respectively connected to the input ITIRP port and the output UVW port, for collecting the voltage signal of the intelligent power module, and outputting the voltage signal to the external device through the output end of the voltage sampling circuit; by integrating HVCI with IPM, PFC circuit, and full-bridge rectifier bridge, it is packaged in one. The power tube used can save costs, and can also significantly reduce switching losses, thereby being more energy-efficient, greatly reducing power losses, and merging the module output end -UVW into a pin foot to save space. The ITRIP port (overcurrent detection port) of the module is designed next to the -UVW port of the module, which can reduce some conducted interference caused by the large loop range of the sampling circuit, making the product more reliable or stable during use, and not easy to be triggered by mistake. It reduces the number of pins, shortens the fault sampling distance, reduces interference sources, makes the product more reliable, and makes the product more competitive in the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings. In the accompanying drawings:

[0016] Figure 1 is a schematic diagram of the structure of an intelligent power module provided by an embodiment of the present invention;

[0017] Figure 2 is a schematic diagram of the structure of a multifunctional intelligent power system provided by an embodiment of the present invention;

[0018] Figure 3 is an internal circuit diagram of an intelligent power module provided by an embodiment of the present invention;

[0019] Figure 4 yes Figure 3 Partial magnification Figure 1 ;

[0020] Figure 5 yes Figure 3 Partial magnification Figure 2 . DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] Combined with Figure 1-Figure 5 As shown, an embodiment of the present invention provides a multifunctional intelligent power system, including: an intelligent power module 1 and a voltage sampling circuit 2 electrically connected to the intelligent power module 1; the intelligent power module 1 is provided with an input ITIRP port 3 and an output UVW port 4, and the input ITIRP port 3 is arranged adjacent to the output UVW port 4; the input end of the voltage sampling circuit 2 is respectively connected to the input ITIRP port 3 and the output UVW port 4, for collecting the voltage signal of the intelligent power module 1, and outputting the voltage signal to an external device through the output end of the voltage sampling circuit 2. HVCI and IPM, PFC circuit, and full-bridge rectifier bridge are integrated and packaged in one. The power tube used can save costs, and can also significantly reduce switching losses, thereby saving more energy, greatly reducing power losses, and merging the module output end -UVW into a pin to save space. The ITRIP port (overcurrent detection port) of the module is designed next to the -UVW port of the module, which can reduce some conducted interference caused by the large loop range of the sampling circuit, making the product more reliable or stable during use, and not easy to be triggered by mistake. Overall integration, fewer pins, shortened fault sampling distance, reduced interference sources, and more reliable product operation.

[0023] In this embodiment, the voltage sampling circuit 2 includes: a sampling resistor R0, a first resistor R1, a filter circuit 21, a comparator and a control circuit 22; the first end of the sampling resistor R0 is connected to the first end of the first resistor R1 and serves as the input end of the voltage sampling circuit 2, the first end of the sampling resistor R0 is connected to the output UVW port 4, and the second end of the sampling resistor R0 is grounded; the second end of the first resistor R1 is respectively connected to the input ITIRP port 3 and the input end of the filter circuit 21, the output end of the filter circuit 21 is connected to the negative input end of the comparator, the positive input end of the comparator is used to connect the threshold voltage, the comparator is also connected to the power supply, the output end of the comparator is connected to the input end of the control circuit 22, and the output end of the control circuit 22 is connected to the external device as the output end of the voltage sampling circuit 2. By comparing the feedback voltage from the first resistor R1 on the input ITIRP port 3 and the comparator action reference voltage, the protection circuit inside the control IC can capture the short-circuit current and automatically start the protection function. Thereby protecting the reliability of the module. The ITIRP action voltage threshold V(ref) is 0.48V (typical value).

[0024] In this embodiment, the filtering circuit 21 includes a second resistor R2 and a first capacitor C1, the first end of the second resistor R2 serves as the input end of the filtering circuit 21, the second end of the second resistor R2 is connected to the first end of the first capacitor C1 and serves as the output end of the filtering circuit 21, and the second end of the first capacitor C1 is grounded.

[0025] In this embodiment, the control circuit 22 includes a third resistor R3, a fourth resistor R4 and a first MOS transistor Q2; the first end of the third resistor R3 serves as the input end of the control circuit 22, the second end of the third resistor R3 is connected to the gate of the first MOS transistor Q2, the source of the first MOS transistor Q2 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is grounded, and the drain of the first MOS transistor Q2 serves as the output end of the control circuit 22.

[0026] Specifically, by making the input ITIRP port 3 and the output UVW port 4 close to each other, the interference problem caused by the long wiring of the voltage divider resistor can be effectively avoided, the sampling signal is more accurate, and the product operation is more reliable.

[0027] R0 is a sampling resistor, used for current and voltage measurement of the port, R1 is a voltage divider resistor, R2 and C1 form an RC circuit, K2 is a comparator, R4 is a current limiting resistor, Q2 is an Nmos tube, bypass resistor R0 = V(ref) / I, where V(ref) is the short-circuit action voltage reference value of 0.48V±5%, and the maximum value of the short-circuit protection action current I(max) should normally be less than 1.7 times the rated current of the IGBT. For example: a 15A / 650V power module with a rated current of 15A, then I(max) should be set to 15x1.7=25.5A.

[0028] In this embodiment, the intelligent power module 1 includes: an inverter part (100-105), a PFC control part 106, a driver IC chip part 107, a bootstrap part 109 and a rectifier 120;

[0029] The first end of the inverter part is used to connect to the power supply VCC, the second end of the inverter part is used to connect to the driver IC chip part 107, and the third end of the inverter part is connected to the output UVW port;

[0030] The PFC control part 106 is used to connect the power supply and the driver IC chip part 107; the first end of the bootstrap part 109 is respectively connected to the second end of the inverter part and the driver IC chip part, and the second end of the bootstrap part 109 is used to connect the bias voltage;

[0031] The rectifier 120 is used to connect to an AC power source and rectify and output the AC power source to form the power supply.

[0032] Specifically, the inverter part is composed of three groups of half bridges, each group of the inverter part includes two triode transistors, wherein 100 and 103 are a group, 101 and 104 are a group, and 102 and 105 are a group, and each group of two triode transistors is divided into an upper bridge arm and a lower bridge arm, wherein the triode transistor 100 is the upper bridge arm, the triode transistor 103 is the lower bridge arm, the triode transistor 101 is the upper bridge arm, the triode transistor 104 is the lower bridge arm, the triode transistor 102 is the upper bridge arm, and the triode transistor 105 is the lower bridge arm. The drains of the triode transistors 100, 101, and 102 of the upper bridge arm are all connected to the high-voltage input terminal VCC2 bus of the module, and the source of the triode transistor 100 of the upper bridge arm is connected to the source of the lower bridge arm. The drain of the triode transistor 103 is connected, the source of the triode transistor 103 of the lower bridge arm is connected to the module external pin -U end, the gates of the two triode transistors are connected to the control chip 107, the source of the triode transistor 101 of the upper bridge arm is connected to the drain of the triode transistor 104 of the lower bridge arm, the source of the triode transistor 104 of the lower bridge arm is connected to the module external pin -V end, the gates of the two triode transistors are connected to the control chip 107, the source of the triode transistor 102 of the upper bridge arm is connected to the drain of the triode transistor 105 of the lower bridge arm, the source of the triode transistor 105 of the lower bridge arm is connected to the module external pin -W end, and the gates of the two triode transistors are connected to the control chip 107. The PFC part is composed of a triode 106 and D1, wherein the drain of the triode is connected to the PFC end and the anode end of D1, the source of the triode is connected to the -VCC terminal, and the cathode of D1 is connected to VCC2. The bootstrap circuit part is composed of three capacitors 109, and the two ends of the capacitors are connected to VB1 and UVS1, VB2 and VVS2, and VB3 and WVS3 respectively. Among them, G1-R is the driving resistance of the triode transistor 100, G2-R is the driving resistance of the triode transistor 101, G3-R is the driving resistance of the triode transistor 102, G4-R is the driving resistance of the triode transistor 103, G5-R is the driving resistance of the triode transistor 104, G6-R is the driving resistance of the triode transistor 105, and G7-R is the driving resistance of the triode transistor 106.

[0033] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of more restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, article or device including the element.

[0034] The embodiments of the present invention are described above in conjunction with the accompanying drawings. What is disclosed is only the preferred embodiment of the present invention. However, the present invention is not limited to the above-mentioned specific implementation manner. The above-mentioned specific implementation manner is only illustrative rather than restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms and equivalent changes without departing from the scope of protection of the purpose of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A multifunctional intelligent power system, characterized in that: include: An intelligent power module and a voltage sampling circuit electrically connected to the intelligent power module; The intelligent power module is provided with an input ITIRP port and an output UVW port, and the input ITIRP port is arranged adjacent to the output UVW port; the input end of the voltage sampling circuit is respectively connected to the input ITIRP port and the output UVW port, for collecting the voltage signal of the intelligent power module, and outputting the voltage signal to an external device through the output end of the voltage sampling circuit.

2. The multifunctional intelligent power system according to claim 1, characterized in that: The voltage sampling circuit includes: a sampling resistor, a first resistor, a filtering circuit, a comparator and a control circuit; the first end of the sampling resistor is connected to the first end of the first resistor and serves as the input end of the voltage sampling circuit, the first end of the sampling resistor is connected to the output UVW port, and the second end of the sampling resistor is grounded; the second end of the first resistor is respectively connected to the input ITIRP port and the input end of the filtering circuit, the output end of the filtering circuit is connected to the negative input end of the comparator, the positive input end of the comparator is used to connect the threshold voltage, the comparator is also connected to a power supply, the output end of the comparator is connected to the input end of the control circuit, and the output end of the control circuit is connected to the external device as the output end of the voltage sampling circuit.

3. The multifunctional intelligent power system according to claim 2, characterized in that: The filter circuit includes a second resistor and a first capacitor, the first end of the second resistor serves as the input end of the filter circuit, the second end of the second resistor is connected to the first end of the first capacitor and serves as the output end of the filter circuit, and the second end of the first capacitor is grounded.

4. The multifunctional intelligent power system according to claim 2, characterized in that: The control circuit includes a third resistor, a fourth resistor and a first MOS transistor; the first end of the third resistor serves as an input end of the control circuit, the second end of the third resistor is connected to the gate of the first MOS transistor, the source of the first MOS transistor is connected to the first end of the fourth resistor, the second end of the fourth resistor is grounded, and the drain of the first MOS transistor serves as an output end of the control circuit.

5. The multifunctional intelligent power system according to claim 1, characterized in that: The intelligent power module includes: an inverter part, a PFC control part, a driver IC chip part, a bootstrap part and a rectifier; The first end of the inverter part is used to connect to the power supply, the second end of the inverter part is used to connect to the driver IC chip part, and the third end of the inverter part is connected to the output UVW port; The PFC control part is used to connect the power supply and the driver IC chip part; the first end of the bootstrap part is respectively connected to the second end of the inverter part and the driver IC chip part, and the second end of the bootstrap part is used to connect the bias voltage; The rectifier is used to connect to an AC power source and rectify and output the AC power source to form the power supply.

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