Adjustable IGBT power distribution circuit

Abstract

The utility model relates to the technical field of IGBT (Insulated Gate Bipolar Translator) devices, in particular to an adjustable IGBT power distribution circuit, which comprises a driving module, an IGBT module, a measuring module and a main control module which are electrically connected in sequence, and the measuring module comprises a current sampling unit, a voltage sampling unit, a first analog-to-digital conversion unit and a second analog-to-digital conversion unit. The current sampling unit is used for acquiring current data entering a collector electrode of the IGBT module, the voltage sampling unit is used for acquiring voltage data of the collector electrode of the IGBT module, and the main control module calculates a power value according to the current data and the voltage data and controls the driving module. According to the utility model, the synchronous acquisition and high-precision digitalization of current and voltage signals are realized, the signal interference is obviously reduced, the accuracy of power calculation is ensured, the main control module dynamically adjusts the output of the driving module based on a real-time power value, the load change can be quickly responded, the power distribution efficiency is optimized, and local overload or resource waste is avoided.

Description

Technical Field

[0001] This utility model relates to the field of IGBT device technology, and more specifically, to an adjustable IGBT power distribution circuit. Background Technology

[0002] IGBTs are composite fully controllable voltage-driven power semiconductor devices that combine the high input impedance of MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) with the low on-state voltage drop of BJTs (Bipolar Junction Transistors). They are widely used in high-voltage, high-current power electronic systems.

[0003] In existing IGBT power distribution circuits, fixed parameter control is usually used, which makes it difficult to achieve dynamic power adjustment, resulting in low system efficiency and insufficient adaptability. Although some solutions attempt to introduce feedback mechanisms, they mostly rely on the detection of a single parameter, which cannot accurately calculate real-time power and affects control accuracy. Utility Model Content

[0004] The purpose of this invention is to provide an adjustable IGBT power distribution circuit to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An adjustable IGBT power distribution circuit includes a drive module, an IGBT module, a measurement module, and a main control module connected in sequence. The measurement module includes a current sampling unit, a voltage sampling unit, a first analog-to-digital converter (ADC), and a second ADC. The current sampling unit is used to acquire current data entering the collector of the IGBT module, and the voltage sampling unit is used to acquire voltage data of the collector of the IGBT module. The current sampling unit, the first ADC, and the main control module are connected in sequence, and the voltage sampling unit, the second ADC, and the main control module are also connected in sequence. The main control module calculates the power value based on the current and voltage data and controls the drive module.

[0007] Preferably, the driving module includes a switch Q1, a switch Q2, a resistor R1, a resistor R2, and a capacitor C1, wherein the switch Q1 is an NPN transistor and the switch Q2 is a PNP transistor.

[0008] The collector of switching transistor Q1 is connected to the power supply +VCC, the emitter of switching transistor Q1 is connected to the emitter of switching transistor Q2, the collector of switching transistor Q2 is connected to the power supply -VCC, the first end of resistor R1 is connected to the output port of the drive module, the second end of resistor R1 is connected to the base of both switching transistors Q1 and Q2, the first end of resistor R2 is connected to the emitter of switching transistor Q1, the second end of resistor R2 is connected to the base of the IGBT module, the first end of capacitor C1 is connected to the second end of resistor R2, and the second end of capacitor C1 is grounded.

[0009] Preferably, the current sampling unit includes resistors R3, R4, R5, and R6, and operational amplifier U1;

[0010] Resistor R3 is connected in series at the collector of the IGBT module. The first end of resistor R4 is connected to the second end of resistor R3. The second end of resistor R4 is connected to the non-inverting input of operational amplifier U1. The first end of resistor R5 is connected to the first end of resistor R3. The second end of resistor R5 is connected to the inverting input of operational amplifier U1. The first end of resistor R5 is connected to the inverting input of operational amplifier U1. The second end of resistor R5 is connected to the output of operational amplifier U1. The first end of resistor R6 is connected to the non-inverting input of operational amplifier U1. The second end of resistor R6 is grounded. The output of operational amplifier U1 is connected to the input port of the first analog-to-digital converter unit.

[0011] Preferably, the voltage sampling unit includes a switch Q3, resistors R7, R8, R9, R10, R11, and R12, an operational amplifier U2, and a capacitor C2, wherein the switch Q3 is an NMOS transistor.

[0012] The drain of the switching transistor Q3 is connected to the collector of the IGBT module. The first end of the resistor R7 is connected to the base of the driving module. The second end of the resistor R7 is connected to the first end of the resistor R8, and the second end of the resistor R8 is grounded. The source of the switching transistor Q3 is connected to the first end of the resistor R9, and the second end of the resistor R9 is grounded. The gate of the switching transistor Q3 is connected to the second end of the resistor R7. The first end of the resistor R10 is connected to the first end of the resistor R9. The second end of the resistor R10 is connected to the non-inverting input of the operational amplifier U2. The first end of the capacitor C2 is connected to the second end of the resistor R10, and the second end of the capacitor C2 is grounded. The first end of the resistor R11 is grounded, and the second end of the resistor R11 is connected to the inverting input of the operational amplifier U2. The first end of the resistor R12 is connected to the inverting input of the operational amplifier U2, and the second end of the resistor R12 is connected to the output of the operational amplifier U2. The output of the operational amplifier U2 is connected to the input port of the second analog-to-digital converter unit.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention achieves synchronous acquisition and high-precision digitization of current and voltage signals by setting up current sampling units and voltage sampling units, which significantly reduces signal interference, ensures the accuracy of power calculation, and enables the main control module to dynamically adjust the output of the drive module based on real-time power values. This allows for rapid response to load changes, optimization of power distribution efficiency, and avoidance of local overload or resource waste. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a circuit diagram of the drive module in the utility model.

[0017] Figure 3 The circuit diagrams for the current sampling unit and voltage sampling unit in the utility model are shown below.

[0018] Figure 4 This is a schematic diagram of the structure of the first analog-to-digital conversion unit and the second analog-to-digital conversion unit in the utility model;

[0019] In the picture:

[0020] 1. Driver module;

[0021] 2. IGBT module;

[0022] 3. Measurement module; 30. Current sampling unit; 31. Voltage sampling unit; 32. First analog-to-digital conversion unit; 33. Second analog-to-digital conversion unit;

[0023] 4. Main control module. Detailed Implementation

[0024] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Please see Figures 1-4 The present invention provides the following technical solution:

[0026] An adjustable IGBT power distribution circuit includes a drive module 1, an IGBT module 2, a measurement module 3, and a main control module 4, which are electrically connected in sequence. The measurement module 3 includes a current sampling unit 30, a voltage sampling unit 31, a first analog-to-digital converter (ADC) unit 32, and a second ADC unit 33. The current sampling unit 30 is used to acquire the current data entering the collector of the IGBT module 2, and the voltage sampling unit 31 is used to acquire the voltage data of the collector of the IGBT module 2. The current sampling unit 30, the first ADC unit 32, and the main control module 4 are electrically connected in sequence, and the voltage sampling unit 31, the second ADC unit 33, and the main control module 4 are also electrically connected in sequence. The main control module 4 calculates the power value based on the current and voltage data and controls the drive module 1. The main control module 4 can be equipped with a common microprocessor. The main control module 4 outputs a PWM signal to control the drive module 1, thereby dynamically adjusting the duty cycle of the IGBT module 2 to achieve closed-loop control of power distribution.

[0027] In this embodiment, the driving module 1 includes a switch Q1, a switch Q2, a resistor R1, a resistor R2, and a capacitor C1. Switch Q1 is an NPN transistor, and switch Q2 is a PNP transistor. Switch Q1 and switch Q2 form a complementary push-pull circuit. The circuit receives the PWM signal from the main control module 4 through the resistor R1 and drives switch Q1 and switch Q2 to conduct alternately. The resistor R2 and capacitor C1 form an RC filter network to filter out high-frequency noise and stabilize the driving signal, ensuring a smooth driving voltage at the base of the IGBT module 2.

[0028] The collector of switching transistor Q1 is connected to the power supply +VCC, the emitter of switching transistor Q1 is connected to the emitter of switching transistor Q2, the collector of switching transistor Q2 is connected to the power supply -VCC, the first end of resistor R1 is connected to the output port of driver module 1, the second end of resistor R1 is connected to the base of both switching transistors Q1 and Q2, the first end of resistor R2 is connected to the emitter of switching transistor Q1, the second end of resistor R2 is connected to the base of IGBT module 2, the first end of capacitor C1 is connected to the second end of resistor R2, and the second end of capacitor C1 is grounded.

[0029] Specifically, the current sampling unit 30 includes resistors R3, R4, R5, and R6, and an operational amplifier U1;

[0030] Resistor R3 is connected in series at the collector of IGBT module 2. The first end of resistor R4 is connected to the second end of resistor R3, and the second end of resistor R4 is connected to the non-inverting input of operational amplifier U1. The first end of resistor R5 is connected to the first end of resistor R3, and the second end of resistor R5 is connected to the inverting input of operational amplifier U1. The first end of resistor R5 is connected to the inverting input of operational amplifier U1, and the second end of resistor R5 is connected to the output of operational amplifier U1. The first end of resistor R6 is connected to the non-inverting input of operational amplifier U1, and the second end of resistor R6 is grounded. The output of operational amplifier U1 is connected to the input port of the first analog-to-digital converter unit 32. Resistor R3 is a low-resistance precision sampling resistor connected in series in the collector circuit of IGBT module 2. Its voltage drop reflects the load current. Resistors R4 and R5, together with operational amplifier U1, form a differential amplifier to amplify the voltage difference signal of resistor R3. The gain is set by the resistance values ​​of resistors R4 and R5. Resistor R6 is a bias resistor used to balance the potential of the non-inverting input of operational amplifier U1 and suppress common-mode interference.

[0031] Furthermore, the voltage sampling unit 31 includes a switch Q3, resistors R7, R8, R9, R10, R11, R12, an operational amplifier U2, and a capacitor C2. The switch Q3 is an NMOS transistor.

[0032] The drain of switching transistor Q3 is connected to the collector of IGBT module 2. The first terminal of resistor R7 is connected to the base of driver module 1. The second terminal of resistor R7 is connected to the first terminal of resistor R8, and the second terminal of resistor R8 is grounded. The source of switching transistor Q3 is connected to the first terminal of resistor R9, and the second terminal of resistor R9 is grounded. The gate of switching transistor Q3 is connected to the second terminal of resistor R7. The first terminal of resistor R10 is connected to the first terminal of resistor R9. The second terminal of resistor R10 is connected to the non-inverting input of operational amplifier U2. The first terminal of capacitor C2 is connected to the second terminal of resistor R10, and the second terminal of capacitor C2 is grounded. The first terminal of resistor R11 is grounded, and the second terminal of resistor R11 is connected to the inverting input of operational amplifier U2. Resistor R12... The first terminal is connected to the inverting input terminal of operational amplifier U2, and the second terminal of resistor R12 is connected to the output terminal of operational amplifier U2. The output terminal of operational amplifier U2 is connected to the input port of the second analog-to-digital converter unit 33. The drive signal of the switching transistor Q3 is synchronized with the IGBT module 2 and only works when the IGBT module 2 is turned on. The square wave signal of the IGBT module 2's turn-on voltage drop is converted into an average value through the series circuit composed of resistor R9, resistor R10 and capacitor C2, and then amplified by operational amplifier U2 before being output. The resistance value of resistor R10 needs to be relatively large to reduce the current of voltage sampling unit 31, reduce power consumption, and avoid interfering with the operation of drive module 1.

[0033] When the adjustable IGBT power distribution circuit of this utility model is in use, the drive module 1 receives the PWM signal output by the main control module 4, amplifies the signal through the complementary push-pull circuit in the drive module 1 and drives the IGBT module 2. The RC filter network in the drive module 1 filters out high-frequency noise to ensure that the base drive signal of the IGBT module 2 is smooth.

[0034] When IGBT module 2 is working, the current sampling unit 30 is connected in series with resistor R3 in the collector circuit of IGBT module 2. The operational amplifier U1 amplifies the voltage difference of resistor R3, and outputs the current digital signal after analog-to-digital conversion. When IGBT module 2 is turned on, the voltage sampling unit 31 converts the square wave signal of the IGBT module 2 turn-on voltage drop into an average value through the series circuit composed of resistor R9, resistor R10 and capacitor C2. The average value is then amplified by operational amplifier U2 and output, and output as a voltage digital signal after analog-to-digital conversion.

[0035] The main control module 4 calculates the real-time power based on the current and voltage data, dynamically adjusts the duty cycle of the PWM signal, controls the output of the drive module 1, thereby adjusting the conduction state of the IGBT module 2 and optimizing the power distribution efficiency.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An adjustable IGBT power distribution circuit, characterized in that: The system includes a drive module (1), an IGBT module (2), a measurement module (3), and a main control module (4) that are electrically connected in sequence. The measurement module (3) includes a current sampling unit (30), a voltage sampling unit (31), a first analog-to-digital converter (32), and a second analog-to-digital converter (33). The current sampling unit (30) is used to acquire the current data entering the collector of the IGBT module (2). The voltage sampling unit (31) is used to acquire the voltage data of the collector of the IGBT module (2). The current sampling unit (30), the first analog-to-digital converter (32), and the main control module (4) are electrically connected in sequence. The voltage sampling unit (31), the second analog-to-digital converter (33), and the main control module (4) are electrically connected in sequence. The main control module (4) calculates the power value based on the current data and the voltage data and controls the drive module (1).

2. The adjustable IGBT power distribution circuit according to claim 1, characterized in that: The driving module (1) includes a switch Q1, a switch Q2, a resistor R1, a resistor R2 and a capacitor C1. The switch Q1 is an NPN transistor and the switch Q2 is a PNP transistor. The collector of switch Q1 is connected to the power supply +VCC, the emitter of switch Q1 is connected to the emitter of switch Q2, the collector of switch Q2 is connected to the power supply -VCC, the first end of resistor R1 is connected to the output port of the drive module (1), the second end of resistor R1 is connected to the base of both switch Q1 and switch Q2, the first end of resistor R2 is connected to the emitter of switch Q1, the second end of resistor R2 is connected to the base of the IGBT module (2), the first end of capacitor C1 is connected to the second end of resistor R2, and the second end of capacitor C1 is grounded.

3. The adjustable IGBT power distribution circuit according to claim 1, characterized in that: The current sampling unit (30) includes resistors R3, R4, R5, R6 and operational amplifier U1; Resistor R3 is connected in series at the collector of the IGBT module (2). The first end of resistor R4 is connected to the second end of resistor R3. The second end of resistor R4 is connected to the non-inverting input of operational amplifier U1. The first end of resistor R5 is connected to the first end of resistor R3. The second end of resistor R5 is connected to the inverting input of operational amplifier U1. The first end of resistor R5 is connected to the inverting input of operational amplifier U1. The second end of resistor R5 is connected to the output of operational amplifier U1. The first end of resistor R6 is connected to the non-inverting input of operational amplifier U1. The second end of resistor R6 is grounded. The output of operational amplifier U1 is connected to the input port of the first analog-to-digital converter unit (32).

4. The adjustable IGBT power distribution circuit according to claim 1, characterized in that: The voltage sampling unit (31) includes a switch Q3, resistors R7, R8, R9, R10, R11, R12, an operational amplifier U2, and a capacitor C2. The switch Q3 is an NMOS transistor. The drain of the switching transistor Q3 is connected to the collector of the IGBT module (2), the first end of the resistor R7 is connected to the base of the driving module (1), the second end of the resistor R7 is connected to the first end of the resistor R8, the second end of the resistor R8 is grounded, the source of the switching transistor Q3 is connected to the first end of the resistor R9, the second end of the resistor R9 is grounded, the gate of the switching transistor Q3 is connected to the second end of the resistor R7, the first end of the resistor R10 is connected to the first end of the resistor R9, the second end of the resistor R10 is connected to the non-inverting input of the operational amplifier U2, the first end of the capacitor C2 is connected to the second end of the resistor R10, the second end of the capacitor C2 is grounded, the first end of the resistor R11 is grounded, the second end of the resistor R11 is connected to the inverting input of the operational amplifier U2, the first end of the resistor R12 is connected to the inverting input of the operational amplifier U2, the second end of the resistor R12 is connected to the output of the operational amplifier U2, and the output of the operational amplifier U2 is connected to the input port of the second analog-to-digital converter unit (33).

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