Dual-Input Power Supply Circuit With Low-Voltage Control Path
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Solution Overview
Problem
Existing power supplying circuits require larger areas and higher costs due to the use of high-voltage elements for control circuits, which also result in slower response speeds and increased chip costs.
Innovation Solution
A power supplying circuit utilizing N-type high-voltage switches and P-type low-voltage switches, controlled by a low-voltage comparator and controller, eliminates the need for additional high-voltage to low-voltage conversion circuits, allowing for reduced circuit area and chip cost by using low-voltage elements for the control circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-voltage elements are used for control circuits, then voltage control capability is improved, but circuit area and chip cost increase
Solution Approach 1:
The control circuit is segmented into two parts: a low-voltage comparator that operates at low voltage to generate control signals, and high-voltage switches that are controlled by these signals. This segmentation allows the control circuit to avoid using high-voltage elements directly, reducing circuit area while maintaining voltage control capability through the high-voltage switches.
Solution Approach 2:
The low-voltage comparator acts as an intermediary between the input voltages and the high-voltage switches. It converts high-voltage signals into low-voltage control signals that can be processed by low-voltage elements, enabling the system to control high-voltage switches without requiring the control circuit itself to withstand high voltages, thus reducing circuit area.
2Reliability
If high-voltage elements are used for control circuits, then voltage control capability is improved, but chip cost increases
Solution Approach 1:
The control circuit is segmented into low-voltage and high-voltage sections. The low-voltage comparator uses inexpensive low-voltage elements to generate control signals, while the high-voltage switches handle the actual voltage control. This segmentation reduces chip cost by avoiding the use of expensive high-voltage elements in the control circuit while maintaining voltage control capability.
Solution Approach 2:
The low-voltage comparator serves as an intermediary that translates high-voltage control needs into low-voltage signals. This allows the system to use cheaper low-voltage elements for the control circuit while still achieving high-voltage control through the switches, thereby reducing overall chip cost.
3Reliability
If high-voltage elements are used for control circuits, then voltage control capability is improved, but response speed decreases
Solution Approach 1:
The control circuit is segmented such that the time-critical signal processing is performed by low-voltage elements (comparator) that have faster response times, while high-voltage elements (switches) are used only for power control. This segmentation improves response speed by avoiding the use of slower high-voltage elements in the control path.
Solution Approach 2:
The low-voltage comparator acts as an intermediary that processes control signals at low voltage where switching speeds are faster. It generates control signals that drive the high-voltage switches, enabling the system to achieve faster response times than would be possible if high-voltage elements were used directly for control signal processing.
Data Source
AI summary
A power supplying circuit includes a first high-voltage switch, a first low-voltage switch, a second high-voltage switch, a second low-voltage switch, and a controller circuit. The first high-voltage switch receives a first input voltage and generates a first node voltage. The first low-voltage switch is coupled between the first high-voltage switch and an output terminal. The second high-voltage switch receives a second input voltage and generates a second node voltage. The second low-voltage switch is coupled between the second high-voltage switch and the output terminal. The controller circuit controls the first high-voltage switch, the first low-voltage switch, the second high-voltage switch, and the second low-voltage switch according to the first node voltage and the second node voltage such that an output voltage is outputted to the output terminal.