Semiconductor Device Sequential Power Switching for Start-Up Time
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Solution Overview
Problem
Existing semiconductor devices experience prolonged start-up times due to the need to supply power to both load circuits and smoothing capacitors simultaneously, leading to increased activation time.
Innovation Solution
Incorporating a control chip with switches that manage the supply of power to the load circuit and smoothing capacitor separately, allowing the smoothing capacitor to be connected only after the load circuit has reached a sufficient voltage, thereby optimizing energy usage and reducing start-up time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is supplied to both the load circuit and the smoothing capacitor simultaneously upon activation, then the power supply can stabilize the voltage, but the start-up time becomes longer
Solution Approach 1:
The power supply system is segmented into two distinct phases: a first power supply phase that activates the load circuit, and a second power supply phase that activates the smoothing capacitor. This segmentation allows the system to prioritize load circuit activation first, then subsequently activate the smoothing capacitor, thereby reducing overall start-up time while maintaining power stability through sequential operation rather than simultaneous operation
Solution Approach 2:
The load circuit is activated in advance before the smoothing capacitor is connected. The first power supply voltage is generated and supplied to the load circuit first, allowing the load to begin operation earlier. Only after the load circuit is activated does the system proceed to activate the smoothing capacitor with the second power supply voltage, implementing a preliminary action sequence that reduces total activation time
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 significantly shortens the start-up time of semiconductor devices by isolating the energy requirements for the load chip and smoothing capacitor, allowing for a lower capacitance value and reduced energy accumulation in the charging capacitor, resulting in a 66% reduction in activation time in specific examples.
Implementation Method 1
a charging capacitor Cx connected between an output terminal of the power source and a ground terminal
Implementation Method 2
a smoothing capacitor C1 connected between a power supply terminal and a ground terminal outside the semiconductor device to suppress a fluctuation of a power supply voltage
Data Source
AI summary
According to one embodiment, a semiconductor device includes: a first switch SWx which switches whether or not to supply a first power supply voltage Vx generated by accumulating a charge outputted from a power source 10, as a second power supply voltage VDD to a first circuit 13, and a second switch SW1 which switches whether or not to connect to the first circuit 13 a smoothing capacitor C1 which suppresses a fluctuation of the second power supply voltage VDD, and the first switch SWx is switched to an on state in response to that the first power supply voltage Vx has reached a sufficient voltage, and then the second switch SW1 is switched to the on state in response to that the second power supply voltage VDD has reached a sufficient voltage.