Power Supply Apparatus Frequency Duty Control
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Solution Overview
Problem
Conventional transformer control methods using frequency or duty of driving pulse signals restrict the variable width of output voltage, necessitating higher output transformers and power FETs, increasing cost and size, and failing to extend the output voltage range effectively.
Innovation Solution
A power supply apparatus with a transformer and a control unit that adjusts both the frequency and duty of the pulse signal based on stored output voltage information, using a memory unit to optimize voltage output, allowing for a wider range of output voltages without requiring high-output transformers or additional circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the transformer is controlled by the frequency of a driving pulse signal, then the output voltage reaches a peak value at a predetermined frequency, but a higher voltage cannot be output
Solution Approach 1:
The patent applies dynamics by making the transformer control system adjustable and flexible. Instead of using a fixed frequency control method, the system dynamically adjusts both the frequency and duty cycle of the driving pulse signal based on feedback from the output voltage. This allows the transformer to operate optimally across a wide range of output voltage requirements, resolving the contradiction between achieving peak voltage at a predetermined frequency and the ability to output higher voltages.
Solution Approach 2:
The patent changes the control parameters from a single parameter (frequency only) to two parameters (frequency and duty cycle). By independently adjusting both parameters, the system can achieve a broader range of output voltages. The control unit modifies the frequency and duty cycle of the driving pulse signal to extend the variable width of the output voltage beyond the peak value limitation of fixed frequency control.
2Power
If the transformer is controlled by the duty of the driving pulse signal, then the on-width can be increased, but the transformer is saturated or the power of a field effect transistor is increased
Solution Approach 1:
The system dynamically adjusts the duty cycle within optimal ranges rather than simply increasing it to maximum. The control unit monitors the output voltage and adjusts the duty cycle of the driving pulse signal to achieve the desired output without pushing the transformer into saturation or requiring higher power FETs. This dynamic adjustment prevents the need for oversized components.
Solution Approach 2:
The patent implements feedback control where the control unit receives information about the output voltage and adjusts the duty cycle accordingly. This closed-loop control ensures that the duty cycle is increased only to the extent necessary to achieve the target output voltage, preventing transformer saturation and avoiding the need for higher power transistors, thereby reducing cost and size.
3Power
If the on-width is increased to a predetermined width, then the output voltage can be increased, but the transformer is saturated
Solution Approach 1:
The control unit uses feedback from the output voltage to adjust the duty cycle of the driving pulse signal. This feedback mechanism ensures that the on-width is increased only to the point where the desired output voltage is achieved, stopping before the transformer enters saturation. This prevents reliability issues while maintaining the ability to output higher voltages.
Solution Approach 2:
The system changes from a fixed duty cycle approach to a variable duty cycle approach that is continuously adjusted based on output voltage requirements. By modifying the duty cycle parameter dynamically within safe operating limits, the system achieves higher output voltages without causing transformer saturation, maintaining both power output and reliability.
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 approach enables a wide range of output voltages to be achieved with an inexpensive configuration, independent of transformer inductance variations, by selectively adjusting frequency and duty, thus reducing costs and size while maintaining performance.
Implementation Method 1
a transformer (103) including a primary winding and a secondary winding, a switching element connected to the primary winding, the switching element configured to turn on or turn off a voltage applied to the primary winding of the transformer according to an input pulse signal
Data Source
AI summary
The power supply apparatus includes a control unit configured to output a pulse signal for driving a switching element, to drive a transformer to output a voltage from a secondary winding of the transformer, and a memory unit configured to store information associating the output voltage with the duty and the frequency of the pulse signal, and the control unit switches the frequency and the duty based on the output voltage and the information stored in the memory unit.