Slew Detection Feedback for High-Voltage Isolation Control Pulses
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Solution Overview
Problem
Slewing conditions in high voltage isolation regions of power devices can disrupt control signals, leading to inefficiencies and potential breakdowns, as parasitic capacitance in low voltage transistors causes current flow that masks control signals during slewing events.
Innovation Solution
A system and method that includes a slew detector coupled to low voltage control circuitry to detect slewing current through parasitic capacitance, providing feedback to control circuitry to generate additional control pulses during slewing conditions, ensuring effective signal reception and reducing power consumption by using discrete control pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage isolation region is used to shield low voltage region from excessive electric field, then reliability of low voltage region is improved, but slewing in high voltage region causes disturbing signals that worsen control effectiveness
Solution Approach 1:
A detector monitors the connection for disturbing signals caused by slewing in the high voltage region. When a disturbing signal is detected, the control circuitry automatically provides additional control pulses to ensure proper operation. This feedback mechanism allows the system to maintain control effectiveness despite the presence of the high voltage isolation region, resolving the contradiction between shielding reliability and operational ease.
2Ease of operation
If additional control pulses are provided during slewing conditions, then control effectiveness is improved, but power consumption increases
Solution Approach 1:
The control circuitry provides control pulses periodically only when slewing conditions are detected by the detector. During normal operation without slewing, standard control pulses are used. When slewing is detected, additional control pulses are inserted periodically to overcome the disturbing signals. This periodic action ensures control effectiveness during critical moments while minimizing unnecessary power consumption during normal operation.
3Use of energy by moving object
If discrete control pulses are used instead of continuous control, then power consumption is reduced, but control signal reception may be mitigated during slewing events
Solution Approach 1:
The detector continuously monitors the connection for disturbing signals and provides feedback to the control circuitry. When slewing conditions are detected, the system responds by providing additional control pulses to ensure proper operation. This feedback mechanism allows the use of discrete control pulses during normal operation (reducing power consumption) while maintaining reliable signal reception during slewing events through adaptive compensation.
4Device complexity
If LDMOS transistor is used to transmit control signal, then integration is improved, but parasitic capacitance causes slew current that masks control signals
Solution Approach 1:
The detector is configured to detect disturbing signals specifically caused by slew current flowing through the parasitic capacitance of the LDMOS transistor. By detecting this harmful effect, the system can trigger additional control pulses to compensate for the masking effect. This converts the harmful parasitic capacitance into a detectable condition that can be compensated for, maintaining integration benefits while mitigating the harmful effect.
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
Enhances control over high voltage isolation regions by providing accurate feedback for improved operation during slewing conditions, reducing power consumption and preventing signal masking, thus maintaining efficient control of power devices.
Implementation Method 1
The LDMOS transistor has a parasitic capacitance through which slew current passes during a slewing condition in the high voltage isolation region
Implementation Method 2
slewing can occur in the high voltage region, which can adversely affect control implemented by circuitry in the low voltage region
Data Source
AI summary
A system includes control circuitry configured to provide one or more control pulses in response to a command signal, the one or more control pulses being communicated from the control circuitry to associated circuitry via a connection. A detector is configured to detect a disturbing signal that mitigates reception of the one or more control pulses via the connection. The command signal is controlled to cause the control circuitry to provide one or more additional control pulses when the disturbing signal is detected by the detector to improve a likelihood of the reception of the one or more control pulses via the connection.