Switching Power Source Burst Mode Control Circuit
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Solution Overview
Problem
Conventional switching power source devices cannot stop the signal level determining circuit and output voltage detecting circuit during burst switching control, leading to inefficient power consumption.
Innovation Solution
A device with a primary-side controller and a secondary-side controller, where the secondary controller transmits stop and resumption signals to the primary controller based on output voltage levels, allowing the switching element to be controlled for temporary stoppage and resumption of switching operations, thereby interrupting monitoring and control operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If burst switching control is implemented to save power by stopping switching operations, then power consumption is reduced, but the signal level determining circuit and output voltage detecting circuit cannot be stopped and continue to consume power
Solution Approach 1:
The control system is segmented into a primary-side controller (first controller) that handles switching control and a secondary-side controller (second controller) that handles voltage detection and control signaling. This segmentation allows the primary-side monitoring circuits to be stopped during burst mode while the secondary-side controller manages the overall control logic, resolving the contradiction between power saving and control complexity.
Solution Approach 2:
The second controller predicts the output voltage level in advance during burst switching control and proactively transmits stop signals to the first controller before the primary-side monitoring circuits would naturally continue operating. This preliminary action enables the primary-side circuits to be stopped earlier and more efficiently, reducing power consumption while maintaining system control.
2Loss of energy
If the switching element is stopped during burst switching control, then power consumption decreases, but the primary-side controller cannot stop its monitoring and control operations
Solution Approach 1:
The system implements periodic burst switching control where the switching element operates in alternating active and stopped phases. During the stopped phases, the primary-side controller's monitoring and control operations are also temporarily suspended based on stop signals from the second controller. This periodic action allows the system to maintain control functionality when needed while achieving significant power savings during stopped phases, resolving the contradiction between power consumption and control operation continuity.
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 configuration reduces power consumption by interrupting power supply to the pulsating voltage generation and monitoring circuits during switching stoppage, allowing for effective power saving during burst switching control operations.
Implementation Method 1
a transformer (120) having a primary winding (122) and a secondary winding (123), the secondary winding generating an output voltage
Data Source
AI summary
A device includes a driving portion, a transformer having a primary winding and a secondary winding, the secondary winding generating an output voltage, the driving portion being connected across the secondary winding so that the output voltage is applied to the driving portion, a switching element connected in series to the primary winding, a first controller provided in a primary side of the transformer for controlling the switching element, and a second controller supplied with the output voltage. The second controller is configured to perform, during implementation of a burst switching control, transmitting a stop signal to the first controller when the output voltage exceeds a first voltage, and transmitting, after transmission of the stop signal, a resumption signal to the first controller when the output voltage falls below a second voltage lower than the first voltage. The first controller controls the switching element to stop performing switching operations in response to the stop signal, and further controls the switching element to resume performing the switching operations in response to the resumption signal.