Cold Start Switching Circuit With Voltage Hysteresis Control
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Solution Overview
Problem
Existing cold start switches struggle to control ON/OFF timing effectively in vibration power generation systems, leading to reduced utilization efficiency of generated power due to large output changes.
Innovation Solution
A switching circuit with a first switching element that controls the connection between a power generation element and an electric storage device based on a voltage applied to a control terminal, and a control circuit that outputs specific voltages to maintain the switching element in on or off states based on predetermined voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the cold start switch is controlled to turn on and off based on voltage thresholds, then the power consumption of the switch is reduced, but the utilization efficiency of generated power deteriorates due to difficulty in determining appropriate timing
Solution Approach 1:
The control circuit continuously monitors the voltage difference across the electric storage device and uses this feedback to dynamically adjust the switching element's state. When the voltage difference exceeds the first threshold, the control circuit turns off the switching element; when it falls below the second threshold, the control circuit turns it on again. This closed-loop feedback mechanism ensures optimal timing for switch operation while maximizing power utilization from the vibration power generation element.
2Productivity
If the switching element remains on to capture all generated power, then the utilization efficiency improves, but the power consumption of the switch increases
Solution Approach 1:
The switching element transitions from a static on/off state to a dynamic state controlled by real-time voltage monitoring. The control circuit adjusts the switching element's state based on the current voltage difference across the electric storage device, enabling the system to adaptively optimize between power capture efficiency and switch power consumption depending on the instantaneous power generation conditions.
3Use of energy by stationary object
If the voltage threshold for switching is set high to reduce switch operation frequency, then the switch power consumption decreases, but the power capture efficiency deteriorates
Solution Approach 1:
The system uses two thresholds (first threshold for turning off, second threshold for turning on) where the second threshold is lower than the first threshold. This creates a hysteresis effect where the switch operates slightly more frequently than a single high threshold would require, but the partial operation is justified by the significant reduction in switch power consumption while maintaining acceptable power capture efficiency.
Data Source
AI summary
A switching circuit includes a first switching element that has a first control terminal, a connection state between a power generation element and an electric storage device being controlled in accordance with a voltage applied to the first control terminal, and a control circuit configured to output a first voltage to the first control terminal until a voltage difference between both ends of the electric storage device becomes a first predetermined value larger than an initial state when the voltage difference increases from the initial state with time, and output a second voltage to the first control terminal until the voltage difference becomes lower than a second predetermined value smaller than the first predetermined value when the voltage difference exceeds the first predetermined value, the first voltage being a voltage that keeps the first switching element on, the second voltage being a voltage that keeps the first switching element off.