Converter Temperature Control for Stable Power Supply Output
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Solution Overview
Problem
Existing power supply devices rely on voltage sensors for overheat protection of converter components, which can lead to operational faults if the voltage sensor fails or malfunctions.
Innovation Solution
A power supply device that includes a converter, an inverter, a temperature detection circuit, and a control unit. The control unit adjusts the switching elements of the converter to reduce the output voltage at a predetermined change rate when the detected temperature exceeds a first limitation value, thereby providing overheat protection without relying on voltage sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage sensor is used for overheat protection of converter components, then overheat protection can be implemented, but operational faults occur when voltage sensor fails or malfunctions
Solution Approach 1:
The invention extracts the overheat protection function from voltage sensor dependency by using temperature detection circuit to directly monitor converter component temperatures and control switching frequency accordingly, eliminating the need for voltage sensor in the protection mechanism
Solution Approach 2:
The invention introduces temperature detection circuit as an intermediary between converter components and control unit, allowing direct temperature-based control of switching frequency without relying on voltage sensor readings, thus providing reliable overheat protection independent of voltage sensor status
2Temperature
If switching frequency is adjusted to protect converter components from overheating, then component temperature is controlled, but bus voltage may exceed upper limit value
Solution Approach 1:
The invention implements feedback control by continuously monitoring converter component temperatures and adjusting switching frequency accordingly, while separately monitoring bus voltage to ensure it remains within upper limit values, balancing thermal protection with voltage control
Solution Approach 2:
The invention changes operating parameters by adjusting switching frequency based on temperature readings from temperature detection circuit, while maintaining bus voltage within acceptable ranges through coordinated control, allowing flexible adaptation to thermal conditions without compromising voltage stability
Data Source
AI summary
An object is to achieve overheat protection for a converter and stable voltage output thereof. This power supply device includes: a converter connected to power supply voltage and having a plurality of switching elements; a temperature detection circuit for detecting a temperature of the converter; an inverter which is connected between the converter and a load, and which converts output voltage of the converter and outputs resultant voltage to the load; and a control unit for controlling the switching elements of the converter. When the temperature detected by the temperature detection circuit has exceeded a first limitation value, the control unit controls the switching elements so that the output voltage of the converter becomes the power supply voltage at a set change rate.