Hardware decoupling circuit for temperature output and protection signal multiplexing pin of power module

Abstract

The utility model relates to a hardware decoupling circuit of a power module temperature output and protection signal multiplexing pin, comprising a power module composite pin which has a temperature signal output function and a fault signal output function; the decoupling circuit is connected with the power module composite pin and is used for decoupling the temperature signal and the fault signal output by the power module composite pin, so that the temperature signal and the fault signal output by the power module composite pin are separated and can be independently output; wherein the decoupling circuit is formed by connecting a triode Q1, a resistor assembly, a capacitor assembly, a power supply end VCC, a first grounding end GND1, a second grounding end GND2, a temperature signal output end T-IPM and a fault signal output end IPM-F0, and the power module composite pin is simultaneously connected with the triode Q1 and the resistor assembly. According to the hardware decoupling circuit provided by the utility model, the reliability and the accuracy of processing the temperature signal and the fault signal of the power module are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to intelligent power module (IPM) signal processing technical field, concretely relates to a hardware decoupling circuit of power module temperature output and protection signal multiplexing pin. BACKGROUND

[0002] At present, some intelligent power modules (IPM) multiplex temperature output function and fault signal (FO signal) output function with the same pin, the reason is that IPM in function upgrade in order to be compatible with the existing package, so keep the number of pins unchanged, so it is necessary to multiplex pin function.

[0003] However, this pin multiplexing method although meets the packaging compatibility requirement to a certain extent, but also brought many problems, for example, when the intelligent power module (IPM) temperature rises, in the case of fixed pull-up resistance, this pin output voltage will be low, this phenomenon directly leads to FO signal high level amplitude instability, possibly fall in the range that main chip can not correctly identify. In addition, even if the main chip can identify the high level, since the high level amplitude reduces, its anti-noise ability also weakens, FO signal is easily interfered by external noise, thereby causing false protection phenomenon.

[0004] Therefore, the utility model provides a hardware decoupling circuit of power module temperature output and protection signal multiplexing pin to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] For the above problems, the utility model aims at providing a hardware decoupling circuit of power module temperature output and protection signal multiplexing pin, which aims at realizing reliable separation of temperature signal and fault signal, ensuring that both can be independently and stably transmitted when outputting through multiplexing pins, improving the working reliability and signal processing precision of the power module.

[0006] The utility model provides a hardware decoupling circuit of power module temperature output and protection signal multiplexing pin, comprising:

[0007] The power module composite pin has temperature signal output function and fault signal output function;

[0008] The decoupling circuit is connected with the power module composite pin and is used for decoupling processing temperature signal and fault signal output by the power module composite pin, so that temperature signal and fault signal output by the power module composite pin are separated and can be independently output; Wherein,

[0009] The decoupling circuit is connected by a triode Q1, a resistor assembly, a capacitor assembly, a power supply end VCC, a first ground end GND1, a second ground end GND2, a temperature signal output end T-IPM and a fault signal output end IPM-F0, and the power module composite pin is connected with the triode Q1 and the resistor assembly.

[0010] Preferably, the resistor assembly includes resistors R1, R2, R3, R4, R5 and R6; the capacitor assembly includes first and second capacitors C1 and C2; the power module composite pin is connected with a first end of the resistor R2, a first end of the resistor R6 and an emitter of the triode Q1, a second end of the resistor R6 is connected with a first end of the first capacitor C1 and the temperature signal output end T-IPM, a second end of the first capacitor C1 is connected with the first ground end GND1, a second end of the resistor R2 is connected with a first end of the resistor R1 and a first end of the resistor R3, a second end of the resistor R3 is connected with a base of the triode Q1, a second end of the resistor R1 is connected with the power supply end VCC and a first end of the resistor R4, a second end of the resistor R4 is connected with a collector of the triode Q1 and a first end of the resistor R5, a second end of the resistor R5 is connected with a first end of the second capacitor C2 and the fault signal output end IPM-F0, and a second end of the second capacitor C2 is connected with the second ground end GND2.

[0011] Preferably, the triode Q1 is an NPN type triode.

[0012] Preferably, the temperature signal output by the power module composite pin is an analog signal, and the fault signal output by the power module composite pin is a digital signal.

[0013] Compared with the related art, the hardware decoupling circuit of the power module temperature output and protection signal multiplexing pin provided by the utility model has the advantages that the temperature signal and the fault signal output by the power module composite pin are separated and can be independently output through the setting of the decoupling circuit, the temperature signal and the fault signal can be stably transmitted according to respective characteristics without interference with each other within a preset action range, especially the fault signal always maintains a fixed high level output state before the over-temperature protection of the power module, the problems of unstable high level of the fault signal, easy interference and difficult identification of the high level in the existing circuit are effectively solved, the working reliability of the power module is greatly improved, the running state of the power module can be more accurately judged, potential faults can be found in time and corresponding measures can be taken, the misjudgment and faults caused by signal coupling are reduced, and the decoupling circuit has simple structure and low manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a circuit structure schematic view of the hardware decoupling circuit of the power module temperature output and protection signal multiplexing pin. DETAILED DESCRIPTION

[0015] The utility model provides a kind of hardware decoupling circuit of power module temperature output and protection signal multiplexing pin, to solve the problem that the existing power module temperature signal and fault signal transmission are easily interfered with each other.

[0016] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0017] Please refer to the drawings Figure 1 The utility model provides a kind of hardware decoupling circuit of power module temperature output and protection signal multiplexing pin, including:

[0018] A power module composite pin 1 has a temperature signal output function and a fault signal output function;

[0019] A decoupling circuit 2 is connected with the power module composite pin 1, and is used for decoupling processing of the temperature signal and the fault signal output by the power module composite pin 1, so that the temperature signal and the fault signal output by the power module composite pin 1 are separated and can be independently output; wherein,

[0020] The decoupling circuit 2 is connected by a triode Q1, a resistance component, a capacitor component, a power supply end VCC, a first ground end GND1, a second ground end GND2, a temperature signal output end T-IPM and a fault signal output end IPM-F0, and the power module composite pin is connected with the triode Q1 and the resistance component at the same time.

[0021] Specifically, the triode Q1 is an NPN type triode; the temperature signal output by the power module composite pin 1 is an analog signal; and the fault signal output by the power module composite pin 1 is a digital signal.

[0022] In the embodiment, the resistance component includes resistors R1, R2, R3, R4, R5 and R6; the capacitor component includes first and second capacitors C1 and C2; the power module composite pin is connected with a first end of the resistor R2, a first end of the resistor R6 and an emitter of the triode Q1 at the same time, a second end of the resistor R6 is connected with a first end of the first capacitor C1 and the temperature signal output end T-IPM at the same time, a second end of the first capacitor C1 is connected with the first ground end GND1, a second end of the resistor R2 is connected with a first end of the resistor R1 and a first end of the resistor R3 at the same time, a second end of the resistor R3 is connected with a base of the triode Q1, a second end of the resistor R1 is connected with the power supply end VCC and a first end of the resistor R4 at the same time, a second end of the resistor R4 is connected with a collector of the triode Q1 and a first end of the resistor R5 at the same time, a second end of the resistor R5 is connected with a first end of the second capacitor C2 and the fault signal output end IPM-F0 at the same time, and a second end of the second capacitor C2 is connected with the second ground end GND2.

[0023] It should be noted that the three-stage tube Q1 is connected with the temperature signal output line and the fault signal output line of the power module composite pin through the resistance assembly, so that the three-stage tube Q1 can sensitively perceive the level change of the fault signal, and when the level of the fault signal changes, the resistance assembly accurately controls the current flowing into the three-stage tube Q1, and then determines the on and off states of the three-stage tube Q1, so as to serve as the control switch of the subsequent decoupling action; when the three-stage tube Q1 is off, the temperature signal output line maintains the original level output, at this time, the resistance R6 in the resistance assembly maintains the temperature signal output line at a high level or a predetermined level range when the three-stage tube Q1 is off, so as to guarantee the stable output of the temperature signal and further strengthen the independence of the temperature signal and the fault signal. In addition, the first capacitor C1 is connected to the temperature signal output line, which is used to filter high-frequency noise in the temperature signal, optimize the quality of the temperature signal, and ensure the independent and stable output of the temperature signal; the second capacitor C2 is connected to the fault signal input line, which is used to filter high-frequency noise in the fault signal, improve the stability and accuracy of the fault signal, and make the two signals more pure in the transmission process, thereby reducing the signal misjudgment caused by noise interference.

[0024] Compared with the related art, the utility model provides a kind of hardware decoupling circuit of power module temperature output and protection signal multiplexing foot, comprising: power module composite pin, it has temperature signal output function and fault signal output function;Decoupling circuit is connected with the power module composite pin, for the decoupling processing of temperature signal and fault signal output by the power module composite pin, to make temperature signal and fault signal output by the power module composite pin separate and can independently output;Wherein, the decoupling circuit is connected by three-stage tube Q1, resistance assembly, capacitor assembly, power supply end VCC, first ground terminal GND1, second ground terminal GND2, temperature signal output end T-IPM and fault signal output end IPM-F0, and the power module composite pin is connected with three-stage tube Q1 and resistance assembly simultaneously.In the above structure, by the setting of decoupling circuit, the separation and independent output of temperature signal and fault signal output by power module composite pin are realized, in preset action range, no matter how the change of external environment, temperature signal and fault signal can be transmitted stably according to respective characteristics, do not interfere with each other, especially fault signal, always maintain fixed high level output state before power module over-temperature protection, effectively solve the problem of unstable high level of fault signal in existing circuit, easily interfered and high level difficult to identify, greatly improve the work reliability of power module, and the running state of power module can be more accurately judged, potential fault is found in time and corresponding measure is taken, reduce the misjudgment and fault caused by signal coupling;And the structure of the decoupling circuit is simple, and the manufacturing cost is low.

[0025] The above-mentioned embodiments should be understood as illustrative rather than restrictive, and the protection scope of the present application is defined by the claims. For those skilled in the art, some non-essential improvements and adjustments made to the present application without departing from the spirit and scope of the present application still fall within the protection scope of the present application.

Claims

1. A hardware decoupling circuit for a power module temperature output and protection signal multiplexing pin, characterized in that, The hardware decoupling circuit comprises: a power module composite pin having a temperature signal output function and a fault signal output function; a decoupling circuit connected with the power module composite pin, for decoupling processing of the temperature signal and the fault signal output by the power module composite pin, so that the temperature signal and the fault signal output by the power module composite pin are separated and can be independently output; wherein The decoupling circuit is connected with the power module composite pin, for decoupling processing of the temperature signal and the fault signal output by the power module composite pin, so that the temperature signal and the fault signal output by the power module composite pin are separated and can be independently output; wherein 2. The hardware decoupling circuit for a power module temperature output and protection signal multiplexed pin according to claim 1, wherein, The decoupling circuit is connected with the power module composite pin, for decoupling processing of the temperature signal and the fault signal output by the power module composite pin, so that the temperature signal and the fault signal output by the power module composite pin are separated and can be independently output; wherein 3. The hardware decoupling circuit for a power module temperature output and protection signal multiplexed pin according to claim 1, wherein, The resistance assembly comprises resistors R1, R2, R3, R4, R5 and R6; the capacitor assembly comprises first and second capacitors C1 and C2; the power module composite pin is connected with the first end of the resistor R2, the first end of the resistor R6 and the emitter of the triode Q1, the second end of the resistor R6 is connected with the first end of the first capacitor C1 and the temperature signal output terminal T-IPM, the second end of the first capacitor C1 is connected with the first ground terminal GND1, the second end of the resistor R2 is connected with the first end of the resistor R1 and the first end of the resistor R3, the second end of the resistor R3 is connected with the base of the triode Q1, the second end of the resistor R1 is connected with the power supply terminal VCC and the first end of the resistor R4, the second end of the resistor R4 is connected with the collector of the triode Q1 and the first end of the resistor R5, the second end of the resistor R5 is connected with the first end of the second capacitor C2 and the fault signal output terminal IPM-F0, and the second end of the second capacitor C2 is connected with the second ground terminal GND2.

4. The hardware decoupling circuit for a power module temperature output and protection signal multiplexed pin of claim 1, wherein, The triode Q1 is an NPN type triode. The temperature signal output by the power module composite pin is an analog signal; and the fault signal output by the power module composite pin is a digital signal.

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