Adaptive gate drive voltage circuit
First Claim
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1. A DC/DC converter comprising:
- at least one switching device responsive to a drive signal having a drive voltage level, for receiving power at a DC input and delivering DC output current to an output circuit of said converter;
a driver for supplying said drive signal to said switching device;
an adaptive drive voltage circuit which generates a feedback signal responsive to said DC output current, and in response thereto generates a control signal; and
a linear regulator which receives said control signal at an input thereof, and controls said driver to supply said drive voltage level to said switching device;
wherein said linear regulator comprises;
an amplifier which receives said control signal at a first input thereof;
a drive voltage source comprising a resistance which generates said drive voltage level according to a current through said resistance, and a transistor in series with said resistance for controlling said current;
an output of said amplifier being connected to a control terminal of said transistor; and
a voltage from said drive voltage source being fed back to a second input of said amplifier.
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Abstract
A circuit and method for reducing losses in a DC/DC converter by optimizing gate drive voltage. The circuit and method detect a change in the output load, or more specifically the output current, and adjust the gate voltage accordingly; in other words, providing adaptive gate drive voltage. In response to a reduction of output current, the invention reduces the gate voltage so as to reduce both conduction and switching losses in the semiconductor switching devices in the output stage.
43 Citations
21 Claims
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1. A DC/DC converter comprising:
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at least one switching device responsive to a drive signal having a drive voltage level, for receiving power at a DC input and delivering DC output current to an output circuit of said converter; a driver for supplying said drive signal to said switching device; an adaptive drive voltage circuit which generates a feedback signal responsive to said DC output current, and in response thereto generates a control signal; and a linear regulator which receives said control signal at an input thereof, and controls said driver to supply said drive voltage level to said switching device; wherein said linear regulator comprises; an amplifier which receives said control signal at a first input thereof; a drive voltage source comprising a resistance which generates said drive voltage level according to a current through said resistance, and a transistor in series with said resistance for controlling said current; an output of said amplifier being connected to a control terminal of said transistor; and a voltage from said drive voltage source being fed back to a second input of said amplifier. - View Dependent Claims (2, 3, 4, 14, 15, 18, 19)
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5. A DC/DC converter comprising:
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a pair of semiconductor switching devices for receiving power at a DC input and delivering DC output current to an output circuit of said converter connected to said pair of semiconductor switching devices; a pair of drivers, each for supplying a respective gate drive signal to a corresponding gate of one of said switching devices, said gate drive signals having a gate drive voltage level; an adaptive drive voltage circuit which generates a feedback signal responsive to said DC output current, and in response thereto generates a control signal; and a linear regulator which receives said control signal at an input thereof, and controls said drivers to supply said drive voltage level to said switching devices; wherein said linear regulator comprises; an amplifier which receives said control signal at a first input thereof; a drive voltage source comprising a resistance which generates said drive voltage level according to a current through said resistance, and a transistor in series with said resistance for controlling said current; an output of said amplifier being connected to a control terminal of said transistor; and a voltage from said drive voltage source being fed back to a second input of said amplifier. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 16, 17, 20, 21)
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Specification