Multi-output Power Supply Feedback Compensation Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-output power supply devices, when power is blocked to one output circuit, the control of other output circuits is compromised, leading to voltage errors and increased power consumption due to the use of a single controller for multiple output voltages, which can result in load damage.
Innovation Solution
A multi-output power supply device with a feedback compensation circuit that includes a compensation switch and resistor, connected in parallel with observation resistors or a reference resistor, to compensate for resistance and stabilize output voltages across all output circuits by complementary switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single controller is used to control multiple output circuits, then device complexity is reduced, but output voltage control precision deteriorates when one output circuit is blocked
Solution Approach 1:
The patent divides the control function into two independent controllers: a first controller for the first output circuit and a second controller for the second output circuit. This segmentation allows each controller to independently manage its respective output circuit, preventing control errors when one circuit is blocked while maintaining relatively simple device architecture.
2Loss of energy
If power is blocked to one output circuit during standby mode, then power consumption is reduced, but output voltage stability of remaining circuits deteriorates
Solution Approach 1:
The patent introduces a feedback compensation circuit that proactively compensates for resistance changes in the feedback path before voltage instability occurs. When the second power switch is off (standby mode), the compensation circuit detects the increased feedback resistance and adjusts the feedback signal accordingly, preventing output voltage deviation before it affects the first output circuit.
Solution Approach 2:
The patent employs a feedback mechanism where the feedback compensation circuit continuously monitors the feedback resistance changes caused by power switching and dynamically adjusts the feedback signal to maintain stable output voltage. This closed-loop feedback ensures that voltage stability is preserved even when power is blocked to reduce standby consumption.
3Loss of energy
If feedback resistance increases when one output circuit is blocked, then power consumption decreases, but measurement precision of output voltage deteriorates
Solution Approach 1:
The patent changes the electrical parameters (resistance values) of the feedback compensation circuit components to optimize the feedback signal under different operating conditions. By selecting specific resistance values for the compensation resistors, the circuit compensates for the increased feedback resistance when one output is blocked, maintaining measurement precision without excessive power consumption.
Data Source
AI summary
A multi-output power supply device includes a first power switch, a first switch controller that controls the first power switch, a transformer that transforms a power supplied from the first power switch, first through Nth output circuits connected to a secondary side of the transformer, where N is a positive integer greater than 1, a second power switch that switches the power output from one of the first through Nth output circuits, a second switch controller that controls the second power switch, a feedback circuit that feeds back output voltages of the first through Nth output circuits, and a feedback compensation circuit that performs a switching operation complementarily with the second power switch to compensate for a resistance of the feedback circuit. Accordingly, when power output to one of the output circuits is blocked, the multi-output power supply device can stably control the power output to the other output circuits.