Power Conversion Device Control Circuit Temperature Compensation
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Solution Overview
Problem
The existing control circuits for switching devices in inverter circuits require multiple temperature detection elements and corresponding signal terminals, leading to an increase in the size of the semiconductor module due to the need for additional circuit elements and terminals.
Innovation Solution
A control circuit that serially connects two switching devices, allowing for variable control of circuit constants based on the temperature of one switching device, using a single temperature detection element and simplified determination circuit to reduce the number of necessary signal terminals and circuit elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature detection element and determination circuit are provided in each switching device, then accurate temperature-based control of each switching device is achieved, but the number of circuit elements and signal terminals increases, leading to increased module size
Solution Approach 1:
The patent merges the temperature detection and control functions for multiple switching devices into a single determination circuit. Instead of having separate determination circuits for each switching device, one determination circuit processes temperature information from one switching device and uses it to control circuit constants for multiple switching devices, thereby reducing the number of circuit elements and signal terminals
Solution Approach 2:
The determination circuit is designed to perform multiple functions: it detects temperature from one switching device, determines temperature-based control signals, and outputs control signals that affect multiple switching devices. This multi-functional approach eliminates the need for separate determination circuits for each switching device, reducing overall circuit complexity and module size
2Measurement precision
If multiple temperature detection elements and signal terminals are provided for each switching device, then individual temperature monitoring is improved, but the device complexity and terminal count increase
Solution Approach 1:
The patent combines multiple temperature monitoring functions into a single determination circuit. Instead of having separate determination circuits for each switching device, one determination circuit processes temperature information from one switching device and uses it to control circuit constants for multiple switching devices, thereby reducing the number of circuit elements and signal terminals
Solution Approach 2:
The temperature detection element in one switching device serves multiple switching devices by providing temperature information that is used to adjust circuit constants for all switching devices. This self-service approach allows one temperature detection element to fulfill the monitoring needs of multiple devices, reducing the total number of detection elements and associated circuitry
Data Source
AI summary
The present invention relates to a control circuit controlling a switching device. The control circuit is a control circuit controlling first and second switching devices which are serially connected between first potential and second potential lower than the first potential and operate in a complementary manner. The control circuit includes a first control circuit controlling the first switching device and a second control circuit controlling the second switching device, and performs variable control of a circuit constant of each of the first and second control circuits based on a temperature of one of the first and second switching devices.