Solar-powered battery charger circuit
First Claim
1. An interface circuit for charging a rechargeable battery from a power source, comprising:
- first and second input terminals adapted to be coupled to said power source;
third and fourth output terminals adapted to be coupled to said rechargeable battery;
a normally-closed relay having normally-closed switch contacts and a coil having a first end and a second end, wherein said normally-closed switch contacts and said coil are connected in series between said first and second input terminals; and
an EMF conduction diode coupled between said fourth output terminal and a junction between said normally-closed switch contacts and said first end of said coil;
wherein said second end of said coil is coupled to said third output terminal, wherein current supplied from said power source through said normally-closed switch contacts energizes said coil to generate an electromagnetic field that causes said normally-closed switch contacts to open and thus remove said supplied current from said coil so that said normally-closed switch contacts continue to oscillate between an open condition and a closed condition, and wherein energy transferred from said power source to said electromagnetic field of said coil when said normally-closed switch contacts are in said closed condition is transferred by discharging said electromagnetic field in response to current through said EMF conduction diode when said normally-closed switch contacts are in said open condition.
3 Assignments
0 Petitions
Accused Products
Abstract
An interface circuit charges a rechargeable battery from a power source. A normally-closed relay with normally-closed switch contacts and a coil having a first end and a second end has its normally-closed switch contacts and the coil coupled in series between first and second input terminals. An EMF conduction diode is coupled between a fourth output terminal and a junction between the normally-closed switch contacts and the first end of the coil. The second end of the coil is coupled to a third output terminal. Current supplied from the power source energizes the coil and causes the normally-closed switch contacts to oscillate between an open condition and a closed condition. Energy transferred from the power source to an electromagnetic field of the coil when the normally-closed switch contacts are in the closed condition is transferred by discharging the electromagnetic field in response to current through the EMF conduction diode when the normally-closed switch contacts are in the open condition.
16 Citations
15 Claims
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1. An interface circuit for charging a rechargeable battery from a power source, comprising:
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first and second input terminals adapted to be coupled to said power source; third and fourth output terminals adapted to be coupled to said rechargeable battery; a normally-closed relay having normally-closed switch contacts and a coil having a first end and a second end, wherein said normally-closed switch contacts and said coil are connected in series between said first and second input terminals; and an EMF conduction diode coupled between said fourth output terminal and a junction between said normally-closed switch contacts and said first end of said coil; wherein said second end of said coil is coupled to said third output terminal, wherein current supplied from said power source through said normally-closed switch contacts energizes said coil to generate an electromagnetic field that causes said normally-closed switch contacts to open and thus remove said supplied current from said coil so that said normally-closed switch contacts continue to oscillate between an open condition and a closed condition, and wherein energy transferred from said power source to said electromagnetic field of said coil when said normally-closed switch contacts are in said closed condition is transferred by discharging said electromagnetic field in response to current through said EMF conduction diode when said normally-closed switch contacts are in said open condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of recharging a rechargeable battery from a power source, said method comprising the steps of:
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connected said power source across a series combination of the normally-closed contacts of a normally-closed relay with a coil of said normally-closed relay so that said normally-closed contacts oscillate between a closed condition and an open condition, wherein said coil stores energy from said power source in an electromagnetic field when said normally-closed contacts are in said closed condition; and when said normally-closed contacts switch to said open condition, transferring said energy from said coil as said electromagnetic field discharges to said rechargeable battery via a unidirectional conducting device. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification