Smart Resistor-Less Pre-Charge Circuit For Power Converter
First Claim
1. A resistor-less device for limiting inrush current in power system startup, for a DC-link capacitor, comprising:
- a DC-link capacitor configurable to be coupled to an output of an AC power source rectifying circuit, to provide a DC-bus voltage;
a current direction sensitive, controllable electrical switch comprising a reverse based diode in parallel with a controllable forward based diode, in series connection with the DC-link capacitor;
a diode controller, coupled to the controllable forward based diode, controlling a conducting state of the forward based diode;
a system measurement signal input to the diode controller; and
a diode controller module having decision logic, using the system measurement signal, to turn on the conducting state of the controllable forward based diode, at a predetermined time and duration,wherein inrush current on a system startup is limited.
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Abstract
A resistor-less device for limiting inrush current in power system startup, for a DC-link capacitor. A DC-link capacitor is coupled to an output of an AC power source rectifying circuit, providing a DC-bus voltage. A current direction sensitive, controllable electrical switch comprising a reverse based diode in parallel with a controllable forward based diode, is in series connection with the DC-link capacitor. A diode controller is coupled to the controllable forward based diode, controlling a conducting state of the forward based diode. A system measurement signal is input to the diode controller and a diode controller module having decision logic, uses the system measurement signal to turn “on” the conducting (or non-conducting) state of the controllable forward based diode, at a predetermined time and duration, wherein inrush current on a system startup is limited.
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Citations
15 Claims
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1. A resistor-less device for limiting inrush current in power system startup, for a DC-link capacitor, comprising:
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a DC-link capacitor configurable to be coupled to an output of an AC power source rectifying circuit, to provide a DC-bus voltage; a current direction sensitive, controllable electrical switch comprising a reverse based diode in parallel with a controllable forward based diode, in series connection with the DC-link capacitor; a diode controller, coupled to the controllable forward based diode, controlling a conducting state of the forward based diode; a system measurement signal input to the diode controller; and a diode controller module having decision logic, using the system measurement signal, to turn on the conducting state of the controllable forward based diode, at a predetermined time and duration, wherein inrush current on a system startup is limited. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A resistor-less method for limiting inrush current in power system startup, for a DC-link capacitor, comprising:
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connecting a DC-link capacitor configurable to an output of an AC power source rectifying circuit, to provide a DC-bus voltage; connecting a current direction sensitive, controllable electrical switch comprising a reverse based diode in parallel with a controllable forward based diode, in series with the DC-link capacitor; connecting a diode controller to the controllable forward based diode, to control a conducting state of the forward based diode; connecting a system measurement signal input to the diode controller; and operating decision logic, using the system measurement signal, to turn on via the controller the conducting state of the controllable forward based diode, at a predetermined time and duration, wherein inrush current on a system startup is limited. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification