Emergency capacitor for a contactless device
First Claim
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1. A power supply for a contactless device comprising:
- a power supply circuit configured to provide an internal power supply voltage;
an emergency capacitor circuit having an emergency capacitor, configured to provide a source current during an external field pause,wherein the emergency capacitor circuit is electrically coupled in parallel with the power supply circuit such that respective input terminals of the emergency capacitor circuit and the power supply circuit are coupled directly at an input node and respective output terminals of the emergency capacitor circuit and the power supply circuit are coupled directly at an output node, anda power supply regulator coupled at the output node and configured to regulate the internal power supply voltage and the source current.
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Abstract
A power supply for a contactless device having a power supply circuit configured to provide an internal power supply voltage, an emergency capacitor circuit having an emergency capacitor, configured to provide a source current during an external field pause, and a power supply regulator configured to regulate the internal power supply voltage and the source current, wherein the emergency capacitor circuit is electrically coupled in parallel with the power supply circuit.
11 Citations
16 Claims
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1. A power supply for a contactless device comprising:
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a power supply circuit configured to provide an internal power supply voltage; an emergency capacitor circuit having an emergency capacitor, configured to provide a source current during an external field pause, wherein the emergency capacitor circuit is electrically coupled in parallel with the power supply circuit such that respective input terminals of the emergency capacitor circuit and the power supply circuit are coupled directly at an input node and respective output terminals of the emergency capacitor circuit and the power supply circuit are coupled directly at an output node, and a power supply regulator coupled at the output node and configured to regulate the internal power supply voltage and the source current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A power supply for a contactless device comprising:
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a power supply circuit for providing an internal power supply voltage; an emergency capacitor circuit, which has an emergency capacitor, for providing a source current during an external field pause, wherein the emergency capacitor circuit is electrically coupled in parallel with the power supply circuit such that respective input terminals of the emergency capacitor circuit and the power supply circuit are coupled directly at an input node and respective output terminals of the emergency capacitor circuit and the power supply circuit are coupled directly at an output node, and a power supply regulator, coupled at the output node, for regulating the internal power supply voltage and the source current.
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Specification