CIRCUIT AND METHOD FOR DETECTING ZERO-CROSSINGS AND BROWNOUT CONDITIONS ON A SINGLE-PHASE OR MULTI-PHASE SYSTEM
First Claim
1. A circuit configuration for detecting zero-crossings and a brownout condition of a power supply, the circuit configuration comprising:
- a zero-crossing detection circuit for detecting zero-crossings of single-phase signals and multiple-phase signals;
a brownout detection circuit;
an isolation and digitization circuit connected to said zero-crossing detection circuit and said brownout detection circuit; and
a filtering circuit connected to said isolation and digitization circuit and outputting an output signal indicating at least the zero-crossings and the brownout condition.
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Accused Products
Abstract
A circuit configuration detects zero-crossings and/or a brownout condition. The circuit configuration contains a zero-crossing detection circuit, a brownout detection circuit, an isolation and digitization circuit connected to the zero-crossing detection circuit and the brownout detection circuit, and a filtering circuit connected to the isolation and digitization circuit. The single circuit configuration can be used for detecting zero-crossings of single-phase and multi-phase systems as well as ascertaining a brownout condition of either the single-phase or the multi-phase systems.
26 Citations
17 Claims
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1. A circuit configuration for detecting zero-crossings and a brownout condition of a power supply, the circuit configuration comprising:
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a zero-crossing detection circuit for detecting zero-crossings of single-phase signals and multiple-phase signals; a brownout detection circuit; an isolation and digitization circuit connected to said zero-crossing detection circuit and said brownout detection circuit; and a filtering circuit connected to said isolation and digitization circuit and outputting an output signal indicating at least the zero-crossings and the brownout condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A circuit configuration for detecting zero-crossings and a brownout condition of a power supply having a signal phase or multi-phases, the circuit configuration comprising:
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a first terminal for connecting to a first phase of the power supply; at least one second terminal for connecting to at least one second phase of the power supply; a neutral terminal for connecting to the power supply; a detection circuit having a first input coupled to said first terminal and said neutral terminal, a second input connected to said second terminal, and an output, said detection circuit detecting zero-crossings of the first and second phases and a brownout condition of the first and second phases. - View Dependent Claims (15)
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16. A method for detecting zero-crossings, which comprises the steps of:
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providing a single circuit having only three input terminals and being capable of detecting zero-crossings of either a single phase electrical signal or a multi-phase electrical signal; detecting at least one zero-crossing; filtering the at least one zero-crossing.
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17. The method according to claim 17, which further comprises detecting a brownout condition affecting the single phase electrical signal or the multi-phase electrical signal.
Specification