Power Control Device Terminal Reduction via Logic Level Verification
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Solution Overview
Problem
Conventional driving modules for switching power supply devices require a large number of terminals for control and verification functions, which complicates the design and increases the number of connections needed.
Innovation Solution
A power control device and driving module configuration that integrates a control terminal, enable output terminal, control circuit, and input/output circuit to manage logic levels and enable signals, allowing for reduced terminal count while maintaining connection verification functionality through a single package with internal voltage generation, power-on reset, and logic level switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power control device includes separate verification terminals and control terminals, then the connection verification function is achieved, but the number of terminals increases
Solution Approach 1:
The control terminal is designed to serve dual purposes: it functions as both a control signal input terminal for driving the MOSFET and a verification terminal for detecting connection status. The control circuit verifies connection by detecting the logic level of the control signal when the input/output circuit is in input standby state, eliminating the need for separate verification terminals.
Solution Approach 2:
The verification function and control function are merged into a single control terminal. The control circuit integrates both the control signal generation and the connection verification capabilities, using the same terminal and circuit resources for both purposes, thereby reducing the overall terminal count.
2Reliability
If the control terminal verifies model number and connection status, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The control circuit is designed to perform multiple functions using the same resources: it generates control signals for MOSFET driving, verifies connection status by detecting logic levels in standby state, and identifies model numbers. This multi-functionality approach avoids adding separate verification circuits and maintains relatively simple device complexity.
3Productivity
If the input/output circuit operates continuously, then the control signal is always available, but the connection verification cannot be performed
Solution Approach 1:
The input/output circuit operates in periodic cycles, alternating between output state (generating control signals) and input standby state (receiving and verifying control signals). During the input standby state, the control circuit verifies connection by detecting the logic level. This periodic switching enables both continuous control functionality and periodic verification without requiring the circuit to operate continuously in one mode.
Data Source
AI summary
The present disclosure relates to a power control device, a driving module and a switching power supply device. The power control device includes: a control terminal, configured to input and output a control signal to and from the driving module; an enable output terminal, configured to output an enable signal to the driving module; a control circuit; and an input/output circuit, configured to have the control signal be a first logic level when the output transistor is turned on and the synchronous rectifier transistor is turned off, and to have the control signal be a second logic level when the output transistor is turned off and the synchronous rectifier transistor is turned on, and to be able to become an input standby state according to an instruction from the control circuit.