MOSFET Power Supply Circuit for Low-Drain Source Switching
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Solution Overview
Problem
Existing power supply control circuits consume current when disconnecting the circuit input from the circuit output, leading to potential deep discharge of internal batteries, and fail to efficiently manage power transitions between multiple power sources.
Innovation Solution
A circuit design that only consumes current when the circuit input voltage is above a reference value, utilizing a startup circuit to supply the control circuit during power transitions, and includes a delay circuit to manage voltage comparisons and a switching component that conducts based on voltage differences, ensuring minimal current consumption during stable voltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a control circuit is used to manage power supply disconnection, then power management capability is improved, but current consumption increases during disconnection state
Solution Approach 1:
The patent extracts the control circuit from the active state during disconnection by disconnecting its power supply. The control circuit is completely powered down when not needed, eliminating its current consumption during the disconnection state while maintaining full control functionality when connected.
Solution Approach 2:
The patent uses a startup circuit to preliminarily activate the control circuit before main power is fully established. This allows the control circuit to be ready for operation immediately when power is applied, avoiding the need for continuous monitoring and reducing overall power consumption.
2Speed
If the control circuit remains active to monitor voltage, then response speed is improved, but current consumption increases during stable voltage conditions
Solution Approach 1:
The control circuit operates periodically rather than continuously. It activates only when voltage transitions occur (power on, power off, voltage threshold crossings) and remains inactive during stable voltage conditions, achieving fast response when needed while minimizing current consumption during stable periods.
Solution Approach 2:
The control circuit monitors its own power supply voltage and automatically activates or deactivates based on voltage thresholds. This self-service mechanism eliminates the need for external control signals and ensures the circuit responds immediately to voltage changes while maintaining low power consumption during stable operation.
3Productivity
If a startup circuit is added to manage power transitions, then power transition efficiency is improved, but device complexity increases
Solution Approach 1:
The startup circuit performs multiple functions: it activates the control circuit, provides initial power, and works together with the main power supply system. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The startup circuit is integrated with the existing power supply and control circuit rather than being a completely separate system. Components are shared and functions are combined where possible, reducing the overall complexity increase while maintaining efficient power transition capabilities.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The circuit (2) has a control circuit (32) connected with an output (10) such that a voltage supply of the control circuit is realized based on a voltage at the output. A start switch (15) is connected with an input (8). The start switch switches a switch component (9) to passage based on voltage increase at the input when the control circuit is not supplied with voltage via the output. The control circuit supplies a control signal for switching the component to interruption when the voltage lies at the input lies below a reference value. The switch component is a MOSFET. An independent claim is also included for an electrical device.