Digitally Controlled Power Source Voltage Setting for Shortened Rise Time
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Solution Overview
Problem
Existing digitally controlled power sources face challenges in shortening rise time without increasing output capacitor capacitance, as methods to suppress starting currents often result in prolonged rise times and the need for large capacitors.
Innovation Solution
A digitally controlled power source with an A/D converter, arithmetic processing unit, PWM generator, switching power circuit, voltage monitor unit, and changing unit that sets an output voltage setting value near the upper limit within tolerable fluctuation ranges, allowing for increased starting currents without capacitor size increase, thereby shortening rise time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a starting current suppressing circuit is provided to restrict starting current, then instantaneous voltage drop is suppressed, but rise time is prolonged
Solution Approach 1:
The output voltage setting value is preliminarily set to the upper limit value within the tolerable range before the DC-DC converters start. This preliminary setting allows the system to tolerate higher starting currents without exceeding voltage specifications, thereby eliminating the need for current suppressing circuits that would prolong rise time.
Solution Approach 2:
The invention changes the parameter of output voltage setting value dynamically - initially setting it to the upper limit value within the tolerable range during startup, and then changing it to the specified value after the DC-DC converters are operational. This parameter change allows unrestricted starting currents while maintaining voltage within acceptable ranges.
2Stability of the object's composition
If capacitors with large capacitance are used to suppress voltage fluctuation, then voltage stability is improved, but device size increases
Solution Approach 1:
By changing the output voltage setting value parameter to the upper limit within the tolerable range during startup, the system can tolerate voltage fluctuations without requiring large capacitance capacitors. This parameter adjustment allows voltage stability to be maintained while keeping the power source compact.
Solution Approach 2:
The voltage monitor unit continuously monitors the output voltage from the DC-DC converters and provides feedback to the changing unit. Based on this feedback, the system determines when to change the output voltage setting value from the upper limit to the specified value, ensuring voltage stability without requiring oversized capacitors.
Data Source
AI summary
In a digitally controlled power source, a setting value of an output voltage therefrom is set in advance in the vicinity of an upper limit within a tolerable range of fluctuation. Even if a voltage drop is caused by starting currents that flow upon initial rise of DC-DC converters in a subsequent stage, such setting makes it possible to confine values of the output voltage within the tolerable range of fluctuation because the setting value of the output voltage is set in advance at a relatively high value. Accordingly, the starting currents in the DC-DC converters can be increased without restriction so that rise time for the power source can be shortened.