DC-DC Converter Control Circuit Abnormal Voltage Maintenance
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Solution Overview
Problem
Conventional DC-DC converter control circuits fail to maintain a specified voltage relationship between output voltages when abnormalities occur, such as a drop in output voltage due to failures, leading to potential burnout and increased circuit complexity.
Innovation Solution
A DC-DC converter control circuit with an error amplifier that compares and amplifies the difference between a reference voltage and the actual voltage of one output relative to another, ensuring the first output voltage remains equal to or less than the second output voltage, even during abnormal conditions, without requiring additional logical circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If logical circuits are provided to maintain voltage relationship during abnormality, then voltage relationship is maintained during failures, but circuit size increases
Solution Approach 1:
The patent combines multiple functions into the existing error amplifier circuit. The same error amplifier that normally compares reference voltage with output voltage is modified to also compare output voltages of different DC-DC converters, eliminating the need for separate logical circuits while maintaining voltage relationship during abnormalities.
Solution Approach 2:
The error amplifier is designed with multi-functionality: it performs normal voltage regulation by comparing reference voltage with output voltage, and simultaneously maintains voltage relationships between multiple DC-DC converters by comparing their output voltages through its second polarity second input terminal.
2Device complexity
If conventional error amplifier is used, then circuit is simple, but voltage relationship cannot be maintained during abnormality
Solution Approach 1:
The error amplifier serves itself by using its existing structure to perform additional function. The same circuit that regulates output voltage also monitors and maintains voltage relationships between converters during abnormalities, without requiring external assistance or separate circuits.
3Reliability
If voltage relationship control is added for abnormality, then reliability during failure improves, but control circuit complexity increases
Solution Approach 1:
The error amplifier dynamically adapts its operation based on input conditions. During normal operation, it functions as a standard voltage regulator. During abnormalities, it automatically adjusts by comparing output voltages of different converters through the second polarity second input terminal, providing abnormality handling without additional control circuits.
Data Source
AI summary
An object of the present invention is to provide a DC-DC converter control circuit capable of maintaining, even when any one of a plural number of DC-DC converters enters the abnormal state due to the occurrence of a failure, a voltage relationship between the output voltage of the faulty DC-DC converter and the output voltage of another DC-DC converter. An error amplifier ERA1G has an inverting input, a first non-inverting input, and a second non-inverting input. A first divided voltage VV1 provided from a first voltage divider circuit VD1 is fed into the inverting input; a reference voltage e1G from ground is fed into the first non-inverting input; and a second divided voltage VV2 provided from a second voltage divider circuit VD2 is fed into the second non-inverting input. The error amplifier ERA1G amplifies the error between the lower of the two voltage inputs fed into the two non-inverting inputs (i.e. the lower of the reference voltage e1G and the second divided voltage VV2), and the first divided voltage VV1 fed into the inverting input. The output terminal of the error amplifier ERA1G is connected to the input terminal of a PWM unit P1G.