BATTERY CHARGER
First Claim
1. A battery charger comprising:
- an input interface arranged to connect to a DC power source, having a positive terminal and a negative terminal;
an output interface arranged to connect to a battery, having a positive terminal and a negative terminal;
a switch circuit connected between the positive terminals of the input interface and the output interface, comprising a control terminal;
a detecting resistor connected between the negative terminals of the input interface and the output interface;
a detecting circuit connected between the negative terminals of the input interface and the output interface to detect a voltage across the detecting resistor and output digital signals; and
a processor receiving a first digital signal from the detecting circuit upon the condition that the switch circuit is off, receiving a second digital signal from the detecting circuit upon the condition that the switch circuit is on, subtracting the first digital signal from the second digital signal to get a third digital signal, comparing the third digital signal with a reference value to determine if the battery is fully charged, and generating a voltage signal to the control terminal of the switch circuit via an inverting circuit for turning off the switch circuit when the battery is fully charged.
1 Assignment
0 Petitions
Accused Products
Abstract
An exemplary battery charger includes an input interface arranged to connect to a DC power source, having a positive terminal and a negative terminal; an output interface arranged to connect to a battery, having a positive terminal and a negative terminal; a switch circuit connected between the positive terminals of the input interface and the output interface, comprising a control terminal; a detecting resistor connected between the negative terminals of the input interface and the output interface; a detecting circuit connected between the negative terminals of the input interface and the output interface to detect a voltage across the detecting resistor and output a digital signal; and a processor receiving the voltage signal to determine whether the battery is fully charged and generate a voltage signal to the control terminal of the switch circuit via an inverting circuit for turning off the switch circuit when the battery is fully charged.
12 Citations
11 Claims
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1. A battery charger comprising:
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an input interface arranged to connect to a DC power source, having a positive terminal and a negative terminal; an output interface arranged to connect to a battery, having a positive terminal and a negative terminal; a switch circuit connected between the positive terminals of the input interface and the output interface, comprising a control terminal; a detecting resistor connected between the negative terminals of the input interface and the output interface; a detecting circuit connected between the negative terminals of the input interface and the output interface to detect a voltage across the detecting resistor and output digital signals; and a processor receiving a first digital signal from the detecting circuit upon the condition that the switch circuit is off, receiving a second digital signal from the detecting circuit upon the condition that the switch circuit is on, subtracting the first digital signal from the second digital signal to get a third digital signal, comparing the third digital signal with a reference value to determine if the battery is fully charged, and generating a voltage signal to the control terminal of the switch circuit via an inverting circuit for turning off the switch circuit when the battery is fully charged. - View Dependent Claims (2, 3, 4, 6)
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5. (canceled)
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7. A compensating method in using a battery charger, the compensating method comprising:
- providing an input interface with a positive terminal and a negative terminal;
an output interface with a positive terminal and a negative terminal; a switch circuit connected between the positive terminals of the input interface and the output interface; a detecting resistor connected between the negative terminals of the input interface and the output interface; a detecting circuit connected between the negative terminals of the input interface and the output interface; a processor connected to the detecting circuit, wherein a reference value is stored in the processor; and an inverting circuit connected between the processor and the switch circuit; connecting a DC power source to the input interface; connecting a battery to the output interface; detecting a first digital value between the negative terminals of the input interface and the output interface by the detecting circuit upon the condition that the switch circuit is off, and sending the first digital value to the processor; detecting a second digital value between the negative terminals of the input interface and the output interface by the detecting circuit upon the condition that the switch circuit is on, and sending the second digital value to the processor; subtracting the first digital value from the second digital value to get a third digital value by the processor; comparing the third digital value with the reference value by the processor; turning off the switch circuit via the inverting circuit by the processor upon the condition that the third digital value is less than the reference value; and turning on the switch circuit via the inverting circuit by the processor upon the condition that the third digital value is more than or equal to the reference value. - View Dependent Claims (8, 9, 10, 11)
- providing an input interface with a positive terminal and a negative terminal;
Specification