Circuit for eliminating snubber current noise in the sense circuit of an H-bridge inverter
First Claim
1. An H-bridge inverter connected to a load comprising:
- a direct current power source;
first and second pairs of switches which are alternately switched to connect said power source to said load;
a plurality of snubber circuits wherein each snubber circuit is connected in parallel to a switch of said first and second pairs of switches for protecting said switch from high currents and voltages;
a sensing circuit connected between said first and second pairs of switches for sensing when said first and second pairs of switches are closed; and
a snubber current counteracting circuit coupled to a first snubber circuit connected in parallel to a first switch of said first pair of switches, a second snubber circuit connected in parallel to a second switch of said second pair of switches and to said sensing circuit; and
wherein said snubber current counteracting circuit counteracts snubber currents flowing in said sensing circuit caused by said first and second snubber circuits.
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Accused Products
Abstract
An H-bridge converter connected to a load includes a direct current power source, first and second pairs of switches alternately switched in order to connect the power source to the load, a plurality of snubber circuits correspondingly connected to the switches for protecting the switches from high currents and voltages, a sensing circuit connected between the first and second pairs of switches for sensing when each of the first and second pairs of switches are closed, and a snubber circuit counteracting circuit connected to a first snubber circuit of the first pair of switches, a second snubber circuit of the second pair of switches and to the sensing circuit for counteracting the flow of snubber currents in the sensing circuit from the first and second snubber circuits.
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Citations
11 Claims
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1. An H-bridge inverter connected to a load comprising:
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a direct current power source; first and second pairs of switches which are alternately switched to connect said power source to said load; a plurality of snubber circuits wherein each snubber circuit is connected in parallel to a switch of said first and second pairs of switches for protecting said switch from high currents and voltages; a sensing circuit connected between said first and second pairs of switches for sensing when said first and second pairs of switches are closed; and a snubber current counteracting circuit coupled to a first snubber circuit connected in parallel to a first switch of said first pair of switches, a second snubber circuit connected in parallel to a second switch of said second pair of switches and to said sensing circuit; and wherein said snubber current counteracting circuit counteracts snubber currents flowing in said sensing circuit caused by said first and second snubber circuits. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An H-bridge inverter connected to a load including a direct current current power source, first and second pairs of switches being alternately switched to connect said power source to said load, a plurality of snubber circuits wherein each snubber circuit is connected in parallel to a switch of said first and second pairs of switches for protecting said switch from high currents and voltages, a sensing circuit connected between said first and second pairs of switches for sensing when said first and second pairs of switches are closed, wherein the improvement comprises;
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a snubber current counteracting circuit coupled to a first snubber circuit connected in parallel to a first switch of said first pair of switches, a second snubber connected in parallel to a second switch of said second pair of switches and to said sensing circuit; and wherein said snubber current counteracting circuit counteracts snubber currents flowing in said sensing circuit caused by said first and second snubber circuits. - View Dependent Claims (9, 10, 11)
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Specification