Power Supply IC Oscillator Switching for Low-Voltage Power Saving
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Solution Overview
Problem
Existing AC-DC converters face challenges in achieving low power consumption, as they continue to use the same switching control method even when the output voltage is lowered, making it difficult to achieve sufficiently low power consumption in integrated circuits controlling the switching of transistors.
Innovation Solution
The integrated circuit for the power supply circuit includes a transformer with a primary, secondary, and auxiliary coil, and a transistor to control the primary coil current, utilizing a first and second oscillator circuit to adjust the transistor driving based on the target output voltage level, and a control circuit to stop the first oscillator circuit operation when the target level is changed to a lower level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the switching frequency is decreased to lower the output voltage, then the output voltage is lowered, but the integrated circuit control method remains the same as normal operation
Solution Approach 1:
The oscillator circuit is designed to dynamically switch between two oscillation modes depending on the target output voltage level. This dynamic capability enables the integrated circuit to adapt its control method from the first oscillation mode to the second oscillation mode, providing the necessary adaptability to match different output voltage requirements with appropriate switching control strategies.
2Reliability
If the first oscillator circuit continues to operate at normal frequency, then the switching control remains effective for normal output voltage, but power consumption cannot be sufficiently reduced when output voltage is lowered
Solution Approach 1:
The system dynamically selects the appropriate oscillation mode based on the target output voltage level. When the target voltage is reduced, the system transitions to the second oscillation mode with the second frequency, ensuring that the switching control remains effective for the reduced voltage operation while achieving sufficiently low power consumption.
Solution Approach 2:
The oscillator circuit changes its operating frequency parameter from the first frequency to the second frequency when the target output voltage is lowered. This parameter change ensures that the switching control effectiveness is maintained while adapting to the reduced power consumption requirement.
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 allows for efficient power management by adjusting the switching frequency and reducing power consumption when the output voltage is lowered, enabling the integrated circuit to operate with lower power consumption.
Implementation Method 1
a transformer including a primary coil, a secondary coil, and an auxiliary coil
Implementation Method 2
a first oscillator circuit configured to output a first oscillator signal having a first frequency corresponding to the output voltage; a second oscillator circuit configured to output a second oscillator signal having a predetermined second frequency
Data Source
AI summary
An integrated circuit for a power supply circuit generating an output voltage of a target level from an input voltage. The integrated circuit includes: a first oscillator circuit configured to output a first oscillator signal having a first frequency corresponding to the output voltage; a second oscillator circuit configured to output a second oscillator signal having a predetermined second frequency; and a driver circuit configured to drive a transistor of the power supply circuit, in response to the first oscillator signal, after the target level of the output voltage is changed to a first level, and drive the first transistor in response to the second oscillator signal, after the target level is changed to a second level lower than the first level, and a control circuit configured to stop an operation of the first oscillator circuit, after the target level is changed to the second level.