Switching Power Supply Feedback Timing for Parallel Output Balancing
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Solution Overview
Problem
Existing switching power supply systems with parallel-connected circuits face issues where differences in output voltage can lead to overcurrent or overload states, particularly in circuits with higher output voltages, causing immediate shutdowns.
Innovation Solution
A switching power supply circuit with a feedback mechanism that adjusts output voltage levels through a variable resistor and an activation circuit that turns on the output switch after a predetermined time, ensuring simultaneous activation and preventing overcurrent or overload states across parallel-connected circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If parallel-connected switching power supply circuits are used to increase system capacity, then productivity is improved, but output voltage differences cause overcurrent or overload states in circuits with higher output voltage
Solution Approach 1:
The activation circuit delays the turning-on timing of the output switch by a predetermined period after the power supply circuit is activated. This preliminary timing control ensures that all parallel-connected circuits start operating simultaneously, preventing any single circuit from experiencing overcurrent or overload conditions due to voltage differences during startup.
2Reliability
If simultaneous reactivation of parallel-connected circuits is implemented, then reliability is improved, but output voltage differences still cause overcurrent states in circuits with higher output voltage
Solution Approach 1:
The activation circuit introduces a predetermined delay period after activation before turning on the output switch. This preliminary timing adjustment ensures that even when circuits are reactivated simultaneously, the delayed activation prevents overcurrent states by ensuring all circuits reach a stable voltage level before full power is applied.
3Ease of operation
If output switch is turned on immediately after activation, then ease of operation is improved, but circuits with higher output voltage enter overcurrent or overload states
Solution Approach 1:
The activation circuit implements a predetermined delay period between activation and turning on the output switch. This preliminary timing control prevents overcurrent and overload states by ensuring that all parallel-connected circuits have sufficient time to stabilize their output voltages before full power is applied, while still maintaining ease of operation through automatic control.
4Reliability
If activation timing is delayed to prevent overcurrent states, then reliability is improved, but reactivation time increases
Solution Approach 1:
The activation circuit uses a predetermined delay period that is optimized to be just long enough to prevent overcurrent states while minimizing the impact on reactivation time. This preliminary timing adjustment balances reliability and response time by using fixed, pre-calculated delay values rather than extended waiting periods.
Data Source
AI summary
Disclosed herein is a switching power supply circuit that includes a switching circuit having an input node connected to an input power supply terminal and an output node connected to an output power supply terminal through an output switch, a feedback circuit configured to feed back information based on a voltage appearing at the output node to the switching circuit, and an activation circuit configured to turn ON the output switch after an elapse of a predetermined time after a voltage appearing at the output node exceeds a predetermined value. The switching circuit is configured to adjust a level of a voltage appearing at the output node based on the information to a predetermined level. The feedback circuit includes an adjustment mechanism configured to adjust a relation between a voltage appearing at the output node and the information.