Power Supply Circuit Phase Delay for Input Current Smoothing
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Solution Overview
Problem
Conventional power supply circuits experience abrupt changes in input current when multiple switch circuits are simultaneously conducted or shut off, leading to audio noise, potential shutdown, and risk of damaging electronic components.
Innovation Solution
A power supply circuit with a phase delay circuit that generates delay signals to control switch circuits, ensuring they are conducted or shut off at different time points, thereby smoothing the input current and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple switch circuits are simultaneously conducted or shut off, then the power supply circuit can drive multiple loads efficiently, but the input current changes abruptly causing audio noise and potential damage to electronic components
Solution Approach 1:
The patent divides the simultaneous switching operation into segmented, sequential operations. The switching control unit controls multiple switch circuits to operate at different time points rather than simultaneously, segmenting the current change into smaller steps. This resolves the contradiction by maintaining power supply efficiency while eliminating abrupt current changes that cause audio noise.
Solution Approach 2:
The patent implements preliminary action by pre-controlling the switching sequence of multiple switch circuits. The switching control unit prepares and executes a predetermined switching sequence where switch circuits are turned on or off in a specific order, preventing abrupt current changes before they can occur. This preliminary control maintains productivity while eliminating the harmful audio noise effect.
2Power
If multiple switch circuits are simultaneously conducted, then the power supply circuit can provide sufficient power to multiple loads, but a great inrush current is generated causing shutdown or mal-operation
Solution Approach 1:
The patent segments the power delivery process by controlling switch circuits to operate at different time points. This segmentation prevents the simultaneous inrush current while still delivering sufficient power to all loads through sequential activation. The switching control unit manages the timing to ensure reliable operation without shutdown or mal-operation.
Solution Approach 2:
The patent applies preliminary action by pre-establishing a switching sequence that controls the order of power delivery to different loads. The switching control unit prepares the switching schedule in advance, activating switch circuits in a controlled sequence rather than simultaneously, thereby preventing inrush current while maintaining adequate power output for all loads.
3Ease of operation
If multiple switch circuits are simultaneously conducted, then all loads receive power at the same time, but the abrupt input current decrease causes audio noise when shutting off
Solution Approach 1:
The patent segments the shutdown operation of multiple switch circuits into sequential steps rather than simultaneous action. The switching control unit controls switch circuits to turn off at different time points, segmenting the current decrease into smaller increments. This maintains ease of load control while eliminating the abrupt current change that generates audio noise during shutdown.
Solution Approach 2:
The patent implements preliminary action by pre-planning the shutdown sequence of switch circuits. The switching control unit prepares a predetermined sequence for turning off switch circuits, ensuring they are deactivated in a controlled order rather than simultaneously. This preliminary control maintains operational simplicity while preventing the harmful audio noise effect during shutdown.
Data Source
AI summary
A power supply circuit for receiving an input voltage to drive a plurality of loads is disclosed. The power supply circuit comprises a plurality of switch circuits, a plurality of power conversion circuits and a phase delay circuit. The plurality of switch circuits are connected with the plurality of loads, respectively. The plurality of power conversion circuits are connected with the plurality of loads and the plurality of switch circuits, respectively, for converting the input voltage into a plurality of driving voltages and transmitting the plurality of driving voltages to the plurality of loads, respectively, when the plurality of switch circuits are conducted. The phase delay circuit is connected with the plurality of switch circuits and a system circuit for generating a plurality of delay signals in response to a switch signal from the system circuit and transmitting the plurality of delay signals to control terminals of the plurality of switch circuits, respectively, so as to make the plurality of switch circuits be conducted or shut off. The plurality of delay signals are converted into an enabling status from a disabling status at different time points so that the plurality of switch circuits are conducted at different time points.