Switching Converter Voltage Detection Circuit
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Solution Overview
Problem
Existing voltage detecting circuits for switching converters are complex and costly due to the need for multiple discrete components, such as optocouplers and third windings, which increase the overall complexity and expense.
Innovation Solution
A voltage detecting circuit that integrates a sample and hold circuit and an average circuit within the switching converter, eliminating the need for discrete components by sampling and holding voltage at a connection node when the first power switch is OFF and the second power switch is ON, and performing arithmetic operations to generate a detecting signal proportional to the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional voltage detecting circuit with optocoupler and third winding is used, then voltage detection function is achieved, but device complexity increases and cost increases
Solution Approach 1:
The patent merges the voltage detection function with the existing switching converter circuit by using the energy storage component and power switches that are already present in the system. The sample and hold circuit and average circuit are integrated into the switching converter, eliminating the need for separate optocoupler and third winding components while maintaining reliable voltage detection functionality.
Solution Approach 2:
The energy storage component and power switches in the switching converter are made to serve dual purposes: their primary function for power conversion and an additional function for voltage detection. By sampling the voltage at the connection node of the energy storage component and first power switch during specific switching states, the existing components perform both power processing and voltage sensing, reducing overall device complexity.
2Reliability
If traditional voltage detecting circuit with optocoupler and third winding is used, then voltage detection function is achieved, but cost increases
Solution Approach 1:
The patent combines the voltage detection function with existing switching converter components, eliminating the need for expensive discrete optocoupler and third winding components. The sample and hold circuit and average circuit utilize the existing energy storage component and power switches, thereby reducing component count and manufacturing cost while maintaining detection reliability.
Solution Approach 2:
The switching converter's existing components (energy storage component and power switches) are made to serve the additional function of voltage detection. By sampling the voltage at the connection node during specific switching states when these components are already active, the system uses its own operational states for detection purposes, eliminating the need for separate dedicated detection components and reducing overall system cost.
3Measurement precision
If discrete components are used for voltage detection, then voltage detection is possible, but the number of components increases
Solution Approach 1:
The patent integrates the voltage detection function into the existing switching converter by using the energy storage component and power switches that are already present. The sample and hold circuit samples the voltage at the connection node, and the average circuit processes this signal to provide accurate voltage detection. This approach maintains measurement precision while significantly reducing the number of discrete components compared to traditional optocoupler-based solutions.
Data Source
AI summary
A voltage detecting circuit used with a switching converter. The switching converter having an energy storage component, a first power switch and a second switch. The voltage detecting circuit has a sample and hold circuit configured to sample and hold the voltage at the connection node of the energy storage component and the first power switch when the first power switch is OFF and the second power switch is ON; and an average circuit configured to average the sampled voltage during a switching period to generate a detecting signal in proportional to the output voltage of the switching converter.