Low-loss noise-resistant high-temperature gate driver circuits
First Claim
1. An amplitude modulated isolated gate driver method for generating a pulse width modulated output signal, the circuit comprising:
- receiving a pulse width modulated input signal having a first state and a second state;
generating a generated signal including a positive-negative oscillating output signal during the first state and an off signal during the second state;
isolating the generated signal using a transformer to create an isolated oscillating signal;
rectifying the isolated oscillating signal to create an isolated rectified signal;
controlling a threshold capacitor charge level with the isolated rectified signal; and
generating a pulse width modulated output signal using the threshold capacitor charge level.
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Accused Products
Abstract
High temperature gate driving circuits with improved noise resistance and minimized loss are implemented with high temperature components with a reduced size magnetic isolation transformer. Input broad-pulse width modulated signals are converted to offsetting narrow pulses to cross the reduced size magnetic transformer minimizing isolation losses. One embodiment teaches time and voltage offset narrow single pulses that control a set and reset regeneration of the pulse width output on the secondary side of the transformer. Another embodiment teaches multiple concurrent voltage offset pulses to cross the transformer and charge a threshold capacitor for both filtering noise and controlling the pulse width regeneration on the secondary side of the transformer.
29 Citations
16 Claims
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1. An amplitude modulated isolated gate driver method for generating a pulse width modulated output signal, the circuit comprising:
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receiving a pulse width modulated input signal having a first state and a second state; generating a generated signal including a positive-negative oscillating output signal during the first state and an off signal during the second state; isolating the generated signal using a transformer to create an isolated oscillating signal; rectifying the isolated oscillating signal to create an isolated rectified signal; controlling a threshold capacitor charge level with the isolated rectified signal; and generating a pulse width modulated output signal using the threshold capacitor charge level. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An amplitude modulated isolated gate driver circuit apparatus receiving a pulse width modulated input signal having a first state and a second state and generating a pulse width modulated output signal, the circuit comprising:
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an oscillator electrically connected to the pulse width modulated input signal; an inverter electrically connected to the oscillator; an isolating transformer having a first side and a second side, the first side electrically connected across the oscillator and the inverter; a rectifier electrically connected across the second side; a threshold capacitor electrically connected to the rectifier; and a gate driver electrically connected to the threshold capacitor. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A gate driving circuit for receiving a pulse width modulated input signal at an input and generating a power switch signal at an output, the circuit comprising:
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a filter input circuit receiving the pulse width modulated input signal and generating a filtered output; a first pulse generator circuit receiving the filtered output and generating a rising pulse; an inverter circuit receiving the filtered output and generating an inverted output; a second pulse generator circuit receiving the inverted output and generating a falling pulse; an isolation transformer circuit receiving the rising pulse and the falling pulse and generating an isolated pulse sequence; a pulse reconstruction circuit receiving the isolated sequence and generating an on-off sequence; a set-reset circuit receiving the on-off sequence and generating a pulse width signal; and a driver circuit receiving the pulse width signal and generating the power switch signal. - View Dependent Claims (14, 15, 16)
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Specification