Snubber energy regenerating circuit
First Claim
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1. A snubber energy regenerating circuit for an inverter comprising one or more switching element arms each including a plurality of switching elements, comprising:
- a plurality of snubber capacitor circuits respectively connected to said plurality of switching elements, each snubber capacitor circuit being charged by a voltage applied to a switching element when said switching element connected thereto is kept off; and
regenerating means, commonly connected to two or more of said plurality of snubber capacitor circuits, for, when said switching elements connected to said snubber capacitor circuits are turned on, discharging charges accumulated in said snubber capacitor circuits so that the discharged energy is regenerated to power supply circuits of the inverter.
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Abstract
In a snubber circuit, two transformers for regenerating snubber energy are commonly provided for more than two switching elements in each of the arms of an inverter. The number of snubber energy regenerating transformers can be limited to only two, regardless of the number of switching elements. The circuit can be simple and compact, without decreasing the efficiency of regeneration of snubber energy.
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Citations
14 Claims
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1. A snubber energy regenerating circuit for an inverter comprising one or more switching element arms each including a plurality of switching elements, comprising:
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a plurality of snubber capacitor circuits respectively connected to said plurality of switching elements, each snubber capacitor circuit being charged by a voltage applied to a switching element when said switching element connected thereto is kept off; and regenerating means, commonly connected to two or more of said plurality of snubber capacitor circuits, for, when said switching elements connected to said snubber capacitor circuits are turned on, discharging charges accumulated in said snubber capacitor circuits so that the discharged energy is regenerated to power supply circuits of the inverter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A power converter comprising:
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an inverter comprising plural first thyristors connected to a positive bus and plural second thyristors series connected to respective of said plural first thyristors and to a negative bus; first and second transformers; and plural snubber circuits each being formed of series circuits of diodes and capacitors, which series circuits are connected in parallel with respective of said plural first and second thyristors; plural first reverse-flow-preventing diodes, one end of each of which is connected to a series connection node of the diode and the capacitor of the snubber circuits connected to said positive bus of said inverter, and the other end of each of which is commonly connected to said positive bus through a primary winding of said first transformer; and plural second reverse-flow-preventing diodes, one end of each of which is connected to a series connection node of the diode and the capacitor of the snubber circuits connected to said negative bus of said inverter, and the other end of each of which is commonly connected to said negative bus through a primary winding of said second transformer, wherein secondary windings of said first and second transformers are coupled to said positive and negative buses connected to a power supply line of said inverter.
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Specification