Control Signal Derived Supply Voltage for Automotive Power Switching
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Solution Overview
Problem
Automotive power switching circuits face challenges due to high voltage transients, large voltage swings, and high frequency noise from vehicle batteries, leading to increased size and cost as well as reliability issues due to the need for extensive protection circuitry.
Innovation Solution
A power switching system where the supply voltage is derived from an input control signal, eliminating the need for battery-derived power and associated filtering and protection circuitry, using a voltage conditioning circuit to generate the supply voltage for the switching control circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protection circuitry is added to filter battery voltage transients and noise, then reliability of the switching circuit is improved, but the IC area and cost increase significantly
Solution Approach 1:
The patent extracts the power supply function from the battery and relocates it to the control signal itself. The voltage conditioning circuit generates the required supply voltage directly from the control signal, eliminating the need for separate battery-powered protection circuitry. This removes the harmful dependency on battery voltage while maintaining reliable operation.
Solution Approach 2:
The patent introduces a voltage conditioning circuit as an intermediary between the control signal and the switching circuit. This intermediary conditiones the control signal to generate a clean, regulated supply voltage, eliminating the need for direct battery connection and associated protection circuitry. The voltage conditioning circuit acts as a mediator that transforms the control signal into a suitable power source.
2Reliability
If protection circuitry is added to shield from electrostatic discharge and voltage transients, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the power supply function from the battery and relocates it to the control signal itself. The voltage conditioning circuit generates the required supply voltage directly from the control signal, eliminating the need for separate battery-powered protection circuitry. This removes the harmful dependency on battery voltage while maintaining reliable operation.
Solution Approach 2:
The control signal serves dual purposes: it controls the switching operation and simultaneously provides the power supply voltage through the voltage conditioning circuit. This self-service approach eliminates the need for separate power supply and protection circuitry, reducing overall system complexity while maintaining reliability.
3Reliability
If filtering circuitry is added to protect from battery noise and transients, then reliability is improved, but the IC area increases by up to half or more
Solution Approach 1:
The patent extracts the power supply function from the battery and relocates it to the control signal itself. The voltage conditioning circuit generates the required supply voltage directly from the control signal, eliminating the need for separate battery-powered protection circuitry. This removes the harmful dependency on battery voltage while maintaining reliable operation.
Solution Approach 2:
The patent changes the source of the supply voltage parameter from battery-derived to control-signal-derived. By transforming the control signal through the voltage conditioning circuit, the system obtains a clean, regulated voltage that inherently lacks the transients and noise present in battery voltage, eliminating the need for extensive filtering.
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 solution reduces the size and cost of the switching circuit IC by eliminating the need for additional filtering and protection circuitry, enhancing reliability by allowing the system to operate effectively in harsh automotive environments.
Implementation Method 1
A power switching system with a supply voltage derived from an input control signal... using a voltage conditioning circuit to generate the supply voltage for the switching control circuit
Data Source
AI summary
Generally, this disclosure provides systems and methods for a power switching system with a switching control circuit powered by a supply voltage derived from an input control signal. The system may include a power switch configured to electrically couple a device between a battery voltage and a ground, the device to be powered by the battery when the power switch is closed; a control circuit coupled to a gate port of the power switch, the control circuit configured to open and close the power switch by adjusting a gate driving signal provided to the gate port in response to a switching control signal provided to the control circuit; and a voltage conditioning circuit configured to generate a supply voltage based on the switching control signal, such that the supply voltage powers the control circuit.