Bridgeless power factor correction circuits
First Claim
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1. An electronic circuit, comprising:
- a first III-N based switch and a second III-N based switch, wherein a source of the first III-N based switch is coupled to a first reference ground and a drain of the second III-N based switch is coupled to a DC high voltage node; and
an inductive component connected in series with a resistor and coupled to a node between the first and second III-N based switches;
whereina first side of the resistor is coupled to a second reference ground which is electrically isolated from the first reference ground, and a second side of the resistor is coupled to a control circuit, the control circuit also being coupled to the second reference ground.
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Abstract
A power factor correction circuit comprises a pair of III-N based switches coupled to a first reference ground, and an inductive component connected in series with a current sensing resistor. A first side of the current sensing resistor is coupled to a second reference ground which is electrically isolated from the first reference ground, and a second side of the current sensing resistor is coupled to a control circuit. The control circuit is also coupled to the second reference ground and is configured to measure current flowing through the inductive component during operation of the power factor correction circuit.
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Citations
20 Claims
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1. An electronic circuit, comprising:
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a first III-N based switch and a second III-N based switch, wherein a source of the first III-N based switch is coupled to a first reference ground and a drain of the second III-N based switch is coupled to a DC high voltage node; and an inductive component connected in series with a resistor and coupled to a node between the first and second III-N based switches;
whereina first side of the resistor is coupled to a second reference ground which is electrically isolated from the first reference ground, and a second side of the resistor is coupled to a control circuit, the control circuit also being coupled to the second reference ground. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of sensing current in a power factor correction circuit, the power factor correction circuit comprising:
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a first III-N based switch and a second III-N based switch, wherein a source of the first III-N based switch is coupled to a first reference ground and a drain of the second III-N based switch is coupled to a DC high voltage node; and an inductive component connected in series with a resistor and coupled to a node between the first and second III-N based switches, wherein a first side of the resistor is coupled to a second reference ground which is electrically isolated from the first reference ground, and a second side of the resistor is coupled to a control circuit, the control circuit including an amplifier which is also coupled to the second reference ground and has a bandwidth that is greater than a switching frequency of each of the first and second III-N based switches;
the method comprisingamplifying a voltage across the resistor; and having the control circuit measure the voltage across the resistor. - View Dependent Claims (12, 13, 14)
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15. An electronic circuit, comprising:
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a first III-N based switch and a second III-N based switch, wherein a source of the first III-N based switch is coupled to a first reference ground and a drain of the second III-N based switch is coupled to a DC high voltage node; a third III-N based switch and a fourth III-N based switch, wherein a source of the third III-N based switch is coupled to the first reference ground and a drain of the fourth III-N based switch is coupled to the DC high voltage node; a first inductive component connected in series with a first resistor and coupled to a node between the first and second III-N based switches; and a second inductive component connected in series with a second resistor and coupled to a node between the third and fourth III-N based switches;
whereina first side of the first resistor and a first side of the second resistor are each coupled to a second reference ground which is electrically isolated from the first reference ground; and a second side of the first resistor and a second side of the second resistor are each coupled to a control circuit, the control circuit also being coupled to the second reference ground. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification