High Side Driver Circuitry for High Voltage Switching
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Solution Overview
Problem
Existing high-side driver circuitry for power switches struggles to operate effectively at high input voltages and high speeds, particularly exceeding 700 volts, due to limitations in DC coupled driver technologies.
Innovation Solution
The development of driver circuitry that converts conventionally modulated voltage signals to current pulse signals, which are then converted back to voltage switch control signals, allowing for high-speed switching with floating reference potentials, enabling operation beyond 1600 volts and reducing dv/dt switching errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If DC coupled driver topology is used, then device complexity and cost are reduced, but the driver cannot operate effectively at high input voltages exceeding 700 volts
Solution Approach 1:
The patent introduces an intermediary coupling mechanism between the low-voltage control circuit and high-voltage power switch. The driver circuit uses a floating gate drive architecture where the control signal is transferred through a capacitive coupling or isolated interface, allowing the control logic to remain at low voltage while the power switch operates at high voltage. This intermediary approach enables DC coupled operation without direct exposure to high voltage stress.
Solution Approach 2:
The patent changes the operating parameters of the driver circuit by implementing a floating reference potential architecture. The gate drive voltage is referenced to a floating potential that can float between ground and the high voltage rail, allowing the driver to adapt its operating point dynamically. This parameter change enables the same DC coupled topology to operate across a wide voltage range from low voltage control signals to high voltage power switching.
2Device complexity
If conventional driver circuitry is used, then circuit simplicity is maintained, but switching speed deteriorates at high input voltages
Solution Approach 1:
The patent implements dynamic gate drive capabilities where the driver circuit can actively control the gate voltage waveform in real-time. The floating gate drive architecture allows for dynamic adjustment of gate charging and discharging rates, enabling fast switching transitions even at high voltages. The circuit can dynamically respond to control signals and adjust the power switch turning speed to optimize performance for different operating conditions.
3Reliability
If high voltage operation is enabled, then voltage capability increases, but dv/dt switching errors increase
Solution Approach 1:
The patent incorporates feedback mechanisms that monitor the actual gate voltage and switching state of the power device. The driver circuit uses this feedback information to adjust the gate drive waveform in real-time, compensating for dv/dt induced errors. By detecting switching anomalies and adjusting the drive signal accordingly, the system can maintain accurate switching control even during high dv/dt transitions at high voltages.
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 enables high-speed switching at voltages exceeding 1600 volts with short turn-on and turn-off delays, improving performance beyond conventional DC coupled drivers and maintaining isolation from high voltage switching effects.
Implementation Method 1
voltage-to-current converter circuitry configured to receive a control signal and configured to convert the control signal to a current pulse signal
Implementation Method 2
current-to-voltage converter circuitry configured to convert the current pulse signal to a voltage switch control signal
Data Source
AI summary
One embodiment of the present disclosure provides a method for controlling a power switch that includes converting a control signal to a current pulse signal, where the control signal is referenced to a first reference potential. The method also includes generating a switch drive voltage signal based on the current pulse signal, where the switch drive signal is referenced to a second reference potential. The method also includes controlling the conduction state of a power switch using the switch drive voltage.