Bootstrap Compensation Circuit High Voltage Response
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Solution Overview
Problem
Bootstrap compensation circuits face a decrease in response speed when high voltages like 600 V or 1200 V are applied, leading to excessive electric power being applied to load and output circuits due to the slow switching between on-state and off-state, which is problematic for long-term high-side power device operations.
Innovation Solution
A bootstrap compensation circuit is designed with a first capacitor connected between a reference potential and a high-side control circuit, featuring series-connected resistors between a floating potential and the reference potential, and an output circuit that supplies current based on a divided potential extraction point, with a second capacitor between the reference potential and the divided potential extraction point to prevent response speed degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If voltage dividing resistors with high resistance values are used to reduce current consumption, then current consumption is reduced, but the time constant of the CR circuit is increased, resulting in lowered response speed
Solution Approach 1:
The voltage dividing resistors are segmented into multiple stages with intermediate capacitors. This segmentation allows each resistor to have lower individual resistance values while maintaining the overall high resistance function, thereby reducing the time constant and improving response speed without increasing current consumption.
Solution Approach 2:
Capacitors are introduced as intermediary elements between the voltage dividing resistors. These intermediate capacitors form multiple CR circuits with smaller time constants, enabling the circuit to respond faster to voltage changes while the series connection of resistors maintains low overall current consumption.
2Reliability
If the output circuit switches from on-state to off-state based on the resistive voltage divider circuit output, then the power source voltage is regulated, but the switching is delayed due to the slower response of the resistive voltage divider circuit
Solution Approach 1:
The voltage detection function is segmented into multiple parallel paths: one through the resistive voltage divider circuit for stable voltage regulation, and another through transient response detection circuits for fast switching response. This segmentation allows both functions to operate simultaneously without interfering with each other.
Solution Approach 2:
The transient response detection circuits detect voltage changes in advance and trigger the output circuit to switch before the resistive voltage divider circuit completes its slower response. This preliminary action prevents excessive power application to the load circuit by initiating the switching action earlier.
3Speed
If a transient response signal is used to achieve high-speed response, then the response speed is improved, but excessive electric power is applied to the load circuit and output circuit until the direct current signal is generated
Solution Approach 1:
The output circuit receives feedback from both the transient response detection circuits and the resistive voltage divider circuit. The feedback mechanism allows the output circuit to switch off when either the transient response indicates a voltage rise or the resistive voltage divider circuit confirms the power source voltage exceeds the reference potential, thereby preventing excessive power application.
Solution Approach 2:
The transient response detection circuits provide preliminary detection of voltage changes, allowing the output circuit to switch in advance. However, the final switching decision is confirmed by the resistive voltage divider circuit, ensuring that the switching occurs at the appropriate moment to prevent excessive power application while maintaining fast response.
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
This configuration reduces the number of insulated power sources required, enhances response speed by maintaining the potential relationship between the divided potential extraction point and the reference potential, and allows for efficient operation under high voltages without excessive power application.
Implementation Method 1
a second capacitor between the reference potential and the divided potential extraction point to prevent response speed degradation
Data Source
AI summary
A bootstrap compensation circuit includes: a plurality of resistors series-connected between a floating potential corresponding to a high-voltage-side potential and a reference potential; a second capacitor that has one end connected to a divided potential extraction point and has the other end connected to the reference potential, the divided potential extraction point located between the plurality of resistors; and an output circuit which supplies current to a first capacitor, according to a potential of the divided potential extraction point.