Switching Power Supply Voltage Control Circuit
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Solution Overview
Problem
The existing switching power supply devices have limited flexibility in setting the stop time of the switching operation during overload or load short circuits, which is dependent on the capacitance of the energy storage element, leading to potential heat generation issues and design constraints.
Innovation Solution
A switching power supply device with a switching suppression circuit that detects a power supply voltage below a specific threshold and stops the switching operation for a predetermined period, independent of the energy storage element's capacitance, allowing for increased flexibility in setting the stop time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the stop time of switching operation is determined by the capacitance of the energy storage element, then the stop time can be controlled, but the design flexibility is limited and heat generation issues occur during overload
Solution Approach 1:
The patent changes the control parameter from capacitance value to resistance value. By using a resistance element instead of relying on capacitor capacitance, the stop time can be adjusted by simply changing the resistance value, providing greater design flexibility and freedom in selecting capacitor specifications while maintaining precise control over the stop time duration.
Solution Approach 2:
The patent substitutes the electrical capacitance-based timing mechanism with a resistance-based timing mechanism. This replacement allows the stop time to be determined by resistance rather than capacitance, enabling independent optimization of both the timing characteristic and the energy storage capacitor selection.
2Duration of action of moving object
If the capacitance of the energy storage element is increased to extend stop time, then the stop time increases, but the device size and cost increase
Solution Approach 1:
The patent changes the timing control parameter from capacitance to resistance. This allows the stop time to be extended by increasing resistance value rather than capacitance value, enabling the use of smaller, lighter capacitors while achieving the desired stop time duration.
3Duration of action of moving object
If the capacitance of the energy storage element is increased to extend stop time, then the stop time increases, but the cost increases
Solution Approach 1:
The patent changes the timing control parameter from capacitance to resistance. This allows the stop time to be extended by increasing resistance value rather than capacitance value, enabling the use of smaller, less expensive capacitors while achieving the desired stop time duration.
4Duration of action of moving object
If the stop time is determined by capacitance, then the timing is controlled, but the degree of freedom in capacitor design is reduced
Solution Approach 1:
The patent changes the timing control parameter from capacitance to resistance. This decouples the timing function from the energy storage function, allowing the capacitor to be selected purely based on energy storage requirements while the resistance element independently controls the stop time, thereby maximizing design freedom.
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 enables the setting of the stop time regardless of the capacitance of the energy storage element, reducing heat generation and design constraints, and allows for more flexible capacitor design, while avoiding the limitations of existing technologies that rely on capacitance for stop time determination.
Implementation Method 1
The capacitor Ci, connected to a primary side power source, smooths and inputs an input voltage Vi into the switching power supply device 100
Implementation Method 2
The capacitor CVCC is connected to the auxiliary winding P2 of the transformer T via the rectifier diode D2. The capacitor CVCC is charged with a voltage generated in the auxiliary winding P2
Implementation Method 3
When the switching element Q turns on, power energy from the input voltage Vi is stored in the transformer T
Implementation Method 4
when the switching element Q turns off, the power energy stored in the transformer T is emitted from the secondary winding S1
Data Source
AI summary
A switching power supply device includes an energy storage element which is charged with a voltage generated in an auxiliary winding of a transformer; a switching control circuit to which the terminal voltage of the energy storage element is given as a power supply voltage and which controls the switching operation of a switching element; an initial operation control circuit which, when it is detected that the power supply voltage is lower than a first voltage, causes a current supply circuit to stop the switching operation until the power supply voltage rises to a second voltage; and a switching suppression circuit which, when it is detected that the power supply voltage is lower than a third voltage which is higher than the first voltage and lower than the second voltage, causes the current supply circuit to stop the switching operation for a predetermined period.