Switching Voltage Regulator for Inductive Loads
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Solution Overview
Problem
Existing voltage drivers face inefficiencies and overheating issues due to power dissipation in pass transistors during current limiting and overvoltage protection, leading to oversized components, increased cost, and limited operation duration in linear mode.
Innovation Solution
A voltage driver with a switching regulator that operates in two modes, utilizing an inductive load switch and a voltage clamp element to rapidly dissipate energy when switching off, allowing for faster response times and reduced power dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pass transistor is operated in linear mode to limit current or regulate voltage, then protection function is achieved, but power dissipation increases significantly
Solution Approach 1:
The patent applies dynamic operation by switching the pass transistor between fully on and fully off states rather than maintaining a static linear mode. The control circuit dynamically adjusts the duty cycle to achieve current limiting and overvoltage protection while minimizing power dissipation through pulsed operation.
Solution Approach 2:
The patent replaces the traditional linear mode operation (analog/continuous control) with a switching mode operation (digital/discrete control). This substitution transforms the continuous power dissipation of linear mode into pulsed operation with significantly reduced average power loss, while maintaining the protection function through feedback control.
2Reliability
If the pass transistor is sized to handle high power dissipation in linear mode, then protection capability is maintained, but device weight and cost increase
Solution Approach 1:
By implementing dynamic switching operation, the patent allows the use of smaller pass transistors that cannot handle continuous high power dissipation. The transistor is switched on and off rapidly, allowing brief high-current pulses while the average power dissipation remains within the capabilities of smaller, lighter devices.
Solution Approach 2:
The patent changes the operating parameters of the pass transistor from continuous linear mode to pulsed switching mode. This parameter change allows smaller transistors to provide the same protection capability by operating at high frequency with controlled duty cycles, reducing the required current handling capacity for continuous operation.
3Duration of action of stationary object
If the pass transistor operates in linear mode for extended periods, then continuous protection is provided, but the transistor overheats and may be damaged
Solution Approach 1:
The patent implements periodic switching action where the pass transistor is turned on and off in rapid succession rather than remaining continuously on in linear mode. This periodic operation with controlled duty cycle allows the transistor to dissipate heat during off periods while providing protection during on periods, enabling extended operation without overheating.
Solution Approach 2:
The replacement of continuous linear mode operation with pulsed switching mode fundamentally changes the thermal profile of the transistor. Instead of sustained high power dissipation causing continuous heating, the pulsed operation allows thermal dissipation between pulses, enabling indefinite operation within safe temperature limits.
4Temperature
If the pass transistor is turned off quickly after linear mode operation, then overheating is prevented, but response time for subsequent protection events increases
Solution Approach 1:
The high-frequency periodic switching establishes a steady-state thermal profile where the transistor never accumulates excessive heat. The rapid on-off cycles create a predictable thermal pattern that allows the transistor to remain ready for immediate protection response without the need for extended cooling periods between operations.
Solution Approach 2:
The dynamic switching control allows the transistor to operate continuously in a controlled manner rather than requiring repeated start-stop cycles. The feedback control system dynamically adjusts the duty cycle in real-time, maintaining both thermal safety and rapid response capability without contradiction.
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 enables faster response times for inductive loads and reduces power dissipation, preventing overheating and allowing for extended operation in current limiting and overvoltage protection modes without the need for oversized components.
Implementation Method 1
introducing a voltage clamp element into a switching regulator... to rapidly dissipate energy when switching off
Data Source
AI summary
A voltage driver includes a voltage input and a voltage regulation controller with an on/off input. The voltage regulation controller is configured to control a switching converter in a first mode and a second mode. The switching converter is configured to operate as an open pass switch in the first mode and configured to operate as a closed pass switch in the second mode. The switching converter includes an inductive load control switch.