Method and apparatus for implementing a power converter input terminal voltage discharge circuit
First Claim
1. A circuit, comprising:
- a control circuit coupled to detect whether an electrical energy source is coupled to an input of a power converter; and
a switch coupled to the control circuit and coupled to the input of the power converter, the control circuit coupled to drive the switch in a first operating mode to transfer energy from the input of the power converter to an output of the power converter when the electrical energy source is coupled to the input of the power converter, the control circuit coupled to drive the switch in a second operating mode when the electrical energy source is uncoupled from the input of the power converter, wherein a capacitance coupled between input terminals of the input of the power converter is discharged to a threshold voltage in less than a maximum period of time from when the electrical energy source is uncoupled from the input terminals of the power converter, wherein the control circuit is coupled to drive the switch to have a high average impedance in the first operating mode.
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Abstract
A switch is coupled to a control circuit and to an input of a power converter. The control circuit is coupled to drive the switch in a first operating mode to transfer energy from the input to an output of the power converter when an electrical energy source is coupled to the input of the power converter. The control circuit is coupled to drive the switch in a second operating mode when the electrical energy source is uncoupled from the input. A capacitance is coupled between input terminals of the input of the power converter and is discharged to a threshold voltage in less than a maximum period of time from when the electrical energy source is uncoupled from the input terminals. The control circuit is coupled to drive the switch to have a high average impedance in the first operating mode.
129 Citations
15 Claims
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1. A circuit, comprising:
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a control circuit coupled to detect whether an electrical energy source is coupled to an input of a power converter; and a switch coupled to the control circuit and coupled to the input of the power converter, the control circuit coupled to drive the switch in a first operating mode to transfer energy from the input of the power converter to an output of the power converter when the electrical energy source is coupled to the input of the power converter, the control circuit coupled to drive the switch in a second operating mode when the electrical energy source is uncoupled from the input of the power converter, wherein a capacitance coupled between input terminals of the input of the power converter is discharged to a threshold voltage in less than a maximum period of time from when the electrical energy source is uncoupled from the input terminals of the power converter, wherein the control circuit is coupled to drive the switch to have a high average impedance in the first operating mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification