Battery charging circuit
First Claim
1. A charging circuit comprising:
- a power supply circuit having a switching element and a current-limiting resistor, the power supply circuit being connected via the switching element and the current-limiting resistor to a battery to charge the battery in trickle charge; and
a control circuit switching on/off the switching element on a given duty to charge the battery in trickle charge by means of a pulse charge,wherein the control circuit further comprises an on-timing adjustment circuit detecting a battery voltage to control the duty of the switching element, andwherein the on-timing adjustment circuit makes a duty ratio smaller in a state of a low battery voltage than in a state of a high battery voltage and turns on/off the switching element to perform the trickle charge by means of the pulse charge.
1 Assignment
0 Petitions
Accused Products
Abstract
A battery charging circuit includes a power supply circuit being connected via a switching element and a current-limiting resistor to a battery to subject the battery to a trickle charge, and a control circuit turning on and off the switching element on a given duty to subject the battery to the trickle charge by means of a pulsed charge. The control circuit includes an on-timing adjustment circuit detecting a battery voltage to control the duty of turning on and off the switching element. The on-timing adjustment circuit makes a duty ratio smaller in a state of a low battery voltage than in a state of a high battery voltage and turns on and off the switching element to perform the trickle charge by means of the pulsed charge.
-
Citations
13 Claims
-
1. A charging circuit comprising:
-
a power supply circuit having a switching element and a current-limiting resistor, the power supply circuit being connected via the switching element and the current-limiting resistor to a battery to charge the battery in trickle charge; and a control circuit switching on/off the switching element on a given duty to charge the battery in trickle charge by means of a pulse charge, wherein the control circuit further comprises an on-timing adjustment circuit detecting a battery voltage to control the duty of the switching element, and wherein the on-timing adjustment circuit makes a duty ratio smaller in a state of a low battery voltage than in a state of a high battery voltage and turns on/off the switching element to perform the trickle charge by means of the pulse charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification