Dual-Supply Reset Circuit Without Large Power-Cutoff Transistors
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Solution Overview
Problem
Existing electronic devices that reset operation states require large transistors to cut off power supply lines, leading to increased device size and power consumption.
Innovation Solution
An electronic device configuration that includes a regulator, a first circuit unit for generating operation signals, and a second circuit unit for processing, with a signal transmitting unit to block current flow, eliminating the need for a dedicated transistor to cut off power supply lines and reducing device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switch of a transistor is used to cut off the power supply line, then the operation state can be reset, but the device size increases due to the requirement of a large size transistor with small on-resistance
Solution Approach 1:
The power supply system is segmented into multiple independent voltage sources: a first power supply voltage for the reset unit and operation signal generating unit, and a second power supply voltage for the processing unit. This segmentation allows the reset function to operate independently without requiring a large transistor to cut off the entire power supply line, thereby reducing device size while maintaining reset accuracy.
Solution Approach 2:
A signal transmitting unit is introduced as an intermediary component between the first circuit unit (generating operation signals) and the second circuit unit (processing unit). This intermediary blocks electric current flow from the first circuit unit to the second circuit unit, enabling isolated control of power supply lines without requiring large transistors, thus resolving the contradiction between reset reliability and device size.
2Reliability
If a large size transistor is used to cut off power supply line, then the power supply can be cut off effectively, but the on-resistance decreases requiring larger transistor size
Solution Approach 1:
The power supply is segmented into multiple independent voltage sources, allowing effective power cutoff of the second power supply voltage to the processing unit without requiring a large transistor. The first power supply voltage continues to supply the reset unit and operation signal generating unit, maintaining cutoff effectiveness while reducing power consumption and device size.
Solution Approach 2:
The signal transmitting unit acts as an intermediary that blocks electric current flow between circuit units. This intermediary component achieves effective power cutoff without relying on a large transistor with low on-resistance, thereby reducing power consumption while maintaining cutoff effectiveness.
3Reliability
If the power supply line is directly cut off by a transistor switch, then the operation state can be reset, but the device complexity increases
Solution Approach 1:
The circuit is segmented into multiple independent units with separate power supply lines: the reset unit and operation signal generating unit operate on the first power supply voltage, while the processing unit operates on the second power supply voltage. This segmentation enables the reset function to operate independently, reducing circuit complexity while maintaining reset reliability.
Solution Approach 2:
The signal transmitting unit serves as an intermediary that simplifies the circuit structure by blocking current flow between circuit units. This intermediary approach reduces device complexity compared to using a large transistor switch, while maintaining the reset function through independent power supply control.
Data Source
AI summary
An operation signal generating unit 11 and a reset unit 12 are included in a first circuit unit 10 that operates based on a first power supply voltage V1 and an output operation of a second power supply voltage B2 is stopped by outputting a reset signal Sr from the reset unit 12 to a regulator 20 in accordance with an operation signal Si of the operation signal generating unit 11. Hence, unlike a conventional technique, a large transistor for cutting off a power supply line is unnecessary, and therefore a device size can be reduced.