Setting a stable operating point and emi control of an h-bridge output stage
AssigneeAnalog Devices International Unlimited Company
InventorsNaoaki NISHIMURA, Abhishek BANDYOPADHYAY
Life of this patent
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Abstract
Apparatus and method for establishing a stable operating point of a H-bridge with a center shunt switch. The stable operating point lets a circuit connected to the H-bridge outputs work in a more ideal condition. As such, an H-bridge with a stable operating point will yield a higher performance and/or save power. Since common mode is one of the biggest sources of electromagnetic interference, a stable operating point in an H-bridge also suppresses EMI.
Claims20
A circuit for setting a stable operating point comprising:
- a first half bridge having a first output;
- a second half bridge having a second output;
- a shunt switch in electrical communication with the first and second outputs;
- a common mode voltage source;
- a first resistor and first switch disposed between the first output and common mode voltage source;
- and
- a second resistor and second switch disposed between the second output and common mode voltage source.
A system for setting a stable operating point in an H-bridge circuit comprising:
- an IDAC;
- a modulator in electrical communication with the IDAC;
- and
- an H-bridge comprising:
- a first half bridge having a first output;
- a second half bridge having a second output;
- a shunt switch in electrical communication with the first and second outputs.
A system for setting a stable operating point comprising:
- an IDAC;
- an integrator coupled to the IDAC configured to receive an IDAC output and a feedback signal;
- a quantizer coupled to the integrator configured to receive and integrator output and generate a quantized signal;
- and
- an H-bridge configured to receive the quantized signal, comprising:
- a first half bridge having a first output;
- a second half bridge having a second output;
- and means for stabilizing an operating point of the H-bridge.
Dependencies are inferred from the claim text.