Self-Powered Drive Circuit Using Pre-Switch-Off Charging
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Solution Overview
Problem
The existing power supply systems for AC-DC chips require additional auxiliary coil windings, leading to high process requirements, power consumption, and costs, especially when operating with protocols like PPS PD 3.0, where the minimum operation voltage can be as high as 10V and reach 60V at 20V output.
Innovation Solution
A self-powered power supply drive circuit and chip that eliminates the need for auxiliary coil windings by using a charging detection circuit, current sampling switch tube, charging switch tube, sampling circuit, and control circuit to periodically switch on and off the drive tube, allowing the energy storage circuit to be charged during the pre-switching-off stage without affecting the normal operation cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an additional auxiliary coil winding is used to supply electrical power to the AC-DC chip, then the chip can operate normally with sufficient power, but the process requirements become high, power consumption increases, and costs rise
Solution Approach 1:
The patent merges the power supply function with the existing drive circuit by using the drive tube's current during its pre-switching-off stage to charge the energy storage circuit. This eliminates the need for a separate auxiliary coil winding, thereby reducing device complexity while maintaining adequate power supply capability for the AC-DC chip
Solution Approach 2:
The drive tube is made multi-functional by utilizing its current in the pre-switching-off stage not only for its primary switching function but also for charging the energy storage circuit to provide power to the chip. This universal usage of the drive tube's current reduces the need for additional dedicated power supply components
2Reliability
If an additional auxiliary coil winding and diode are added for power supply, then the chip operation is guaranteed, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the power supply function into the existing drive circuit by using the drive tube's current during its pre-switching-off stage to charge the energy storage circuit. This integration eliminates additional components like auxiliary coil windings and diodes, reducing circuit complexity while ensuring reliable chip operation through controlled charging cycles
3Adaptability or versatility
If the capacitor voltage VCC is increased to meet minimum operation voltage requirements (10V minimum, 60V at 20V output), then the chip can operate with PPS protocol, but the requirements for process and power consumption become excessively high
Solution Approach 1:
The patent employs periodic action by utilizing the drive tube's current during its pre-switching-off stage in each switching cycle to charge the energy storage circuit. This periodic charging during normal operation allows the system to maintain adequate VCC levels for PPS protocol compatibility without requiring excessively high continuous power consumption or overly complex process requirements
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
This solution enables self-powered operation without additional coil windings, reducing process complexity, power consumption, and costs, while maintaining normal switching cycles and energy output, with improved conversion efficiency and cost-effectiveness compared to traditional systems.
Implementation Method 1
allowing the energy storage circuit to be charged during the pre-switching-off stage without affecting the normal operation cycle
Data Source
AI summary
Disclosed by present disclosure are a self-powered power supply drive circuit and a self-powered power supply drive chip. The self-powered power supply drive circuit includes a charging detection circuit, a current sampling switch tube, a charging switch tube, a sampling circuit and a control circuit. The drive tube and current sampling switch tube, which are connected in series, are connected between the input power supply and the ground. The current sampling switch tube is switched off and the charging switch tube is switched on during the pre-switching-off stage, such that the current which flows through the drive tube during the pre-switching-off stage is used to charge the energy storage circuit. The charging time is in the pre-switching-off stage, which never affects the normal switching cycle of the drive tube itself and the normal output of energy. Moreover, this way of charging does not require any additional auxiliary coil winding.