Synchronous Rectification Device With Isolation Coupling
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Solution Overview
Problem
Conventional synchronous rectification devices face issues with short circuits and electromagnetic interference due to simultaneous activation of primary and secondary side switches, leading to power loss and damage.
Innovation Solution
A synchronous rectification device with a first control circuit, secondary side switch, isolation coupling element, and second control circuit that generates control signals to prevent simultaneous activation of switches, using a level generating circuit and counting circuit to adjust signals and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional synchronous rectification device uses primary side switch and secondary side switch without isolation coupling, then the device structure is simple, but simultaneous activation of both switches causes short circuit and electromagnetic interference
Solution Approach 1:
The patent introduces an isolation coupling element as an intermediary between the primary side control circuit and secondary side control circuit. This coupling element transmits control signals while providing electrical isolation, preventing simultaneous switch activation without requiring complex interlocking logic. The coupling element acts as a mediator that enables coordinated control while maintaining circuit isolation.
Solution Approach 2:
The control system is segmented into primary side control circuit and secondary side control circuit, with each circuit independently controlling its respective switch. The isolation coupling element divides the control signal transmission into isolated segments, allowing each control circuit to operate independently while maintaining coordinated operation through the coupling signal.
2Object-affected harmful factors
If isolation coupling element is added to prevent simultaneous switch activation, then short circuit prevention is improved, but the device complexity increases
Solution Approach 1:
The isolation coupling element serves as a mediator that blocks electromagnetic interference between primary and secondary sides while transmitting necessary control signals. It provides galvanic isolation that prevents electromagnetic coupling and interference, reducing harmful effects without requiring additional shielding or filtering components.
3Manufacturing precision
If conventional control method is used without level generating circuit, then the control circuit is simple, but switch timing precision is insufficient leading to simultaneous activation
Solution Approach 1:
The level generating circuit performs preliminary action by establishing reference voltage levels before switch activation occurs. It generates standardized voltage levels that define clear switching thresholds, ensuring that switches are activated at precisely the correct moments. This preliminary level establishment prevents timing ambiguity and simultaneous activation.
Solution Approach 2:
The level generating circuit changes voltage parameters to establish distinct threshold levels for switch activation. By providing standardized voltage levels (e.g., high level and low level), it transforms the control signal parameters into precise switching thresholds, enabling accurate timing control of the power switches.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents short circuits and electromagnetic interference by ensuring the secondary side switch is not activated when the primary side switch is on, maintaining efficient power conversion and extending device lifespan.
Implementation Method 1
The isolation coupling element includes a receiving side and a reaction side. The receiving side is configured to receive the first control signal. The reaction side is configured to generate a coupling signal in response to the first control signal.
Implementation Method 2
The conversion circuit includes a primary side coil and a secondary side coil, the primary side coil is configured to receive input power, and the secondary side coil is configured to generate inductive power in response to the input power.
Data Source
AI summary
A synchronous rectification device is adapted to control a conversion circuit, where he conversion circuit includes: a primary side coil, configured to receive input power; and a secondary side coil, configured to generate inductive power in response to the input power. The synchronous rectification device includes: a first control circuit, configured to provide a first control signal to control the primary side coil; a secondary side switch, configured to generate an ON signal and an OFF signal according to the inductive power; an isolation coupling element; and a second control circuit. The isolation coupling element includes: a receiving side, configured to receive the first control signal; and a reaction side, configured to generate a coupling signal in response to the first control signal. The second control circuit outputs a second control signal according to the coupling signal, the ON signal, and the OFF signal to adjust the inductive power.