Power Supply Device Frequency Stabilization via Bias Current
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Solution Overview
Problem
Non-linear control systems in power supply devices, such as DC-DC converters, experience operation frequency fluctuations due to power supply voltage changes, which can affect noise and stability, particularly in wireless communication applications.
Innovation Solution
The power supply device incorporates a current source circuit and delay circuit configuration that adjusts the bias current based on the power supply voltage, using a voltage division ratio and resistance elements to maintain a constant operation frequency independent of the power supply voltage, and includes a calibration circuit to further stabilize the operation frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If non-linear control system is used for power supply device, then response speed is improved and circuit configuration is simplified, but operation frequency fluctuates with power supply voltage changes
Solution Approach 1:
The patent changes the parameter of bias current dynamically based on power supply voltage. The current source circuit adjusts the bias current in proportion to the power supply voltage, which compensates for voltage fluctuations and stabilizes the operation frequency while maintaining the simple non-linear control structure
Solution Approach 2:
The patent implements a feedback mechanism where the power supply voltage is detected and used to adjust the bias current through the current source circuit. This feedback loop ensures that the operation frequency remains stable by automatically compensating for voltage changes without adding complex control circuitry
2Device complexity
If operation frequency fluctuates with power supply voltage, then circuit configuration remains simple, but noise level increases and stability decreases
Solution Approach 1:
The patent adjusts the bias current parameter in response to power supply voltage changes, which stabilizes the operation frequency and reduces noise without complicating the circuit configuration. The current source circuit achieves this with minimal additional components
Data Source
AI summary
According to an embodiment of the present invention, a power supply device includes a switching circuit, a detection circuit, a first comparator, a current source circuit, and a delay circuit. The switching circuit performs switching control of a power supply voltage. The detection circuit detects an output voltage from the switching circuit. The first comparator compares the voltage detected by the detection circuit with a first reference voltage which is set in advance. The current source circuit outputs a bias current which has correlation with the power supply voltage. The delay circuit receives the bias current from the current source circuit, and outputs, to the switching circuit, a delay time which corresponds to an increase time of the output voltage, by using the bias current in accordance with the result of comparison performed by the first comparator.