POWER SUPPLY FOR A TWO-WIRE MODULE
First Claim
1. A power supply for a two-wire bus connected electrical module, comprising:
- a protection circuit having an input for connection to a two-wire bus;
a data and power splitter connected to the protection circuit;
a current limiter connected to the data and power splitter;
a energy storage cell connected to the current limiter; and
a DC to DC converter connected to the energy storage cell; and
wherein an output of the DC to DC converter can provide more intense energy per unit of time than the two-wire bus.
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Accused Products
Abstract
A power supply approach and mechanism for electrical devices using a polarity-insensitive two-wire bus that can carry data and power. However, some devices, such as CO2 sensors and secure digital memory cards, may need certain amounts of energy for measuring and writing data, respectively, that are more intense than the amount of energy available on the two-wire bus. Sensor, card and other device data may be conveyed by the two-wire bus. The present approach and mechanism may convert power from the two-wire bus into intense energy that can enable the sensors, cards and other devices to satisfactorily operate. A current limiter may be incorporated to protect the two-wire bus from loss of data and energy for slave devices on the bus during a period of charging a storage cell in that an empty huge storage capacitor connected to bus directly could short the bus.
27 Citations
20 Claims
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1. A power supply for a two-wire bus connected electrical module, comprising:
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a protection circuit having an input for connection to a two-wire bus; a data and power splitter connected to the protection circuit; a current limiter connected to the data and power splitter; a energy storage cell connected to the current limiter; and a DC to DC converter connected to the energy storage cell; and wherein an output of the DC to DC converter can provide more intense energy per unit of time than the two-wire bus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A mechanism for providing energy to a device, comprising:
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a two-wire bus capable of providing power and data; an electromagnetic compatibility and polarity protection circuit connected to the two-wire bus; a splitter for extracting data from the two-wire bus; a storage capacitor; a current limiter for limiting an amount of current from the splitter to the storage capacitor; and a DC-DC converter for providing an electrical energy supply having greater intensity than the electrical energy supply available on the two-wire input. - View Dependent Claims (11, 12, 13)
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14. A method for providing data and power relative to an electrical device, comprising:
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providing a two-wire bus for conveying power and data; connecting a splitter to the two-wire bus for obtaining data from the two-wire bus; limiting current from the two-wire bus going to a storage cell; and monitoring an amount of energy in the storage cell to determine when there is a sufficient amount of energy to enable an energy intensive action by an electrical device. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification