High Voltage Enable Pin Startup Circuit
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Solution Overview
Problem
Wide input voltage integrated circuits face challenges in converting high voltage enable signals to lower voltage levels without drawing significant current, requiring large chip areas to implement high impedance for current limitation.
Innovation Solution
An enable circuit with a clamp and switches is used to generate a start voltage, regulating the enable signal to limit current draw by closing and opening switches based on the start voltage, allowing the integrated circuit to operate with minimal current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high impedance is implemented to limit current draw, then current consumption is reduced, but chip area increases
Solution Approach 1:
The enable circuit is segmented into multiple functional blocks: a high voltage enable terminal, a voltage conversion circuit with clamp and switches, a start voltage generation circuit, and a main circuit. This segmentation allows current limiting functionality to be distributed across specific components rather than requiring a single large high-impedance structure, thereby reducing overall chip area while maintaining low current consumption.
Solution Approach 2:
A start voltage (lower than supply voltage) is introduced as an intermediary to control the switching elements. This start voltage acts as a mediator between the high voltage enable signal and the main circuit, enabling precise control of current flow through the switches without requiring large impedance values, thus resolving the contradiction between current limiting and area efficiency.
2Power
If high voltage enable signal is directly converted to lower voltage, then voltage conversion is achieved, but significant current is drawn
Solution Approach 1:
The circuit employs dynamic switching elements (switches controlled by start voltage) that adjust their state based on the enable signal and start voltage levels. This dynamic control allows the circuit to convert high voltage to lower voltage while minimizing current draw by opening switches when not needed and closing them only during controlled transitions, achieving efficient voltage conversion with minimal power loss.
Solution Approach 2:
The circuit changes the voltage parameter from high voltage (supply voltage level) to lower voltage (start voltage level) through the clamp and switching mechanism. By controlling the switching elements with the start voltage, the circuit achieves voltage conversion while maintaining low current draw, as the switches prevent direct high-current paths between voltage rails.
3Adaptability or versatility
If enable circuitry is rated at high voltage to match supply voltage, then it can be tied to supply voltage, but current draw increases
Solution Approach 1:
Different parts of the enable circuit are assigned different voltage ratings and functions: the enable terminal handles high voltage (supply voltage level) for compatibility, while the voltage conversion circuit and main circuit operate at lower voltages (start voltage level) to minimize current consumption. This local differentiation of voltage levels allows the circuit to maintain adaptability at the interface while reducing power consumption internally.
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
The solution effectively converts high voltage enable signals to lower voltage levels with negligible current draw, reducing the need for large chip areas and minimizing power consumption.
Implementation Method 1
The clamp is configured to receive the supply voltage and generate a start voltage by clamping the supply voltage to a threshold voltage level that is less than the supply voltage
Implementation Method 2
The first switch is coupled to the enable terminal and configured to be closed by the start voltage. The enable signal is configured to pass through the first switch when the first switch is closed to generate an enable intermediate signal
Data Source
AI summary
An integrated circuit includes an enable circuit and a main circuit. The enable circuit is configured to receive a supply voltage and an enable signal at a first voltage level, generate a start voltage by clamping the supply voltage to a threshold voltage level that is less than the supply voltage and generate an enable intermediate signal at a second voltage level that is less than the first voltage level and limited by the start voltage. In response to the enable intermediate signal being generated at the second voltage level, the enable circuit is configured to generate a start signal (such as a current). In response to the start signal being generated, the enable circuit is configured to generate an output signal at a third voltage level that is less than the first voltage level. The main circuit is configured to utilize the output signal as a supply voltage rail.