Temperature detection of power switches using modulation of driver output impedance

A technology of power switch and output impedance, which is applied in output power conversion devices, thermometers and thermometers using electrical/magnetic components directly sensitive to heat, etc., can solve problems such as inaccuracy and delay in response

Pending Publication Date: 2022-03-18
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, these traditional techniques can be imprecise and can lead to delayed responses to temperature-related issues with the switch
For example, external components can measure the temperature of the case of the switch or the temperature near the switch with some inherent delay, but these measurements are not always an accurate indication of the temperature of the power switch itself

Method used

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  • Temperature detection of power switches using modulation of driver output impedance
  • Temperature detection of power switches using modulation of driver output impedance
  • Temperature detection of power switches using modulation of driver output impedance

Examples

Experimental program
Comparison scheme
Effect test

example 1- 1

[0102] Example 1 - A circuit comprising a driver circuit configured to control a power switch circuit comprising a power switch and a temperature dependent circuit element electrically coupled to at least one node of the power switch : wherein the driver circuit is configured to deliver a modulated signal to a control node of the power switch to control on / off switching of the power switch, wherein the driver circuit is configured to implement a circuit related to the temperature element associated current measurement and voltage measurement, and controlling the power switch based at least in part on the current measurement and the voltage measurement, and wherein the current measurement and the voltage measurement are based on the Timing associated with on / off switching is performed.

[0103] EXAMPLE 2 The circuit of example 1, wherein the current measurement and the voltage measurement are performed when a voltage across the power switch is stable and the power switch is not...

example 27- 1

[0128] EXAMPLE 27 - A method of controlling a power switching circuit comprising a power switch and a temperature dependent circuit element electrically coupled to at least one node of the power switch, the method comprising: providing the A control node of a power switch delivers a modulated signal to control on / off switching of the power switch; performs a current measurement associated with the temperature dependent circuit element; performs a voltage measurement associated with the temperature dependent circuit element and controlling the power switch based at least in part on the current measurement and the voltage measurement.

[0129] Example 28 The method of example 27, further comprising performing the current measurement and the voltage measurement according to a timed sequence based on timing associated with the on / off switching of the power switch.

[0130] EXAMPLE 29 The method of examples 27 or 28, wherein controlling the power switch comprises controlling the po...

example 35- 1

[0136] Example 35 - A circuit arrangement comprising: a power switch circuit comprising a power switch and a temperature dependent circuit element electrically coupled to at least one node of the power switch; and a driver circuit configured to provide power to the power switch A control node of a switch delivers a modulated signal to control on / off switching of the power switch, wherein the driver circuit is configured to perform current and voltage measurements associated with the temperature dependent circuit element and based at least in part on The current measurement and the voltage measurement control the power switch, and wherein the current measurement and the voltage measurement are performed based on timing associated with the on / off switching of the power switch.

[0137] EXAMPLE 36 The circuit arrangement of Example 35, wherein the temperature dependent circuit element comprises a temperature dependent resistor.

[0138] EXAMPLE 37 The circuit arrangement of examp...

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PUM

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Abstract

Embodiments of the invention relate to temperature detection of a power switch using modulation of driver output impedance. The present disclosure relates to circuits and techniques for detecting or responding to a temperature of a power switch. A driver circuit for a power switch may be configured to deliver a modulation signal to a control node of the power switch to control on / off switching of the power switch, where the driver circuit is further configured to modulate an output impedance of the driver circuit at the control node, one or more voltage measurements are performed while modulating the output impedance of the driver circuit, and the power switch is controlled based at least in part on the one or more voltage measurements.

Description

technical field [0001] The present disclosure relates to power switches, and more particularly to techniques and circuits for detecting temperature in power switching circuits. Background technique [0002] Power switches are widely used in various applications to control the power delivered to a load. Power switches may include field effect transistors (FETs), bipolar junction transistors (BJTs), gallium nitride (GaN) switches, or possibly silicon controlled rectifiers (SCRs). Examples of FETs may include, but are not limited to, junction field effect transistors (JFETs), metal oxide semiconductor FETs (MOSFETs), dual gate MOSFETs, insulated gate bipolar transistors (IGBTs), any other type of FET, or any combination thereof . Examples of MOSFETs may include, but are not limited to, PMOS, NMOS, DMOS, or any other type of MOSFET, or any combination thereof. Examples of BJTs may include, but are not limited to, PNP, NPN, heterojunction, or any other type of BJT, or any comb...

Claims

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Application Information

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IPC IPC(8): G01K7/16G01K13/00H02M1/08
CPCG01K7/16G01K13/00H02M1/08H03K2017/0806H03K17/0828G01R31/2872H03K17/18G01R31/40
Inventor J·巴伦舍恩A·阿伦斯
Owner INFINEON TECH AG
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