Load control unit
First Claim
1. A load control unit that generates a driving control signal whose level is changed by a prescribed frequency and duty in accordance with a driving instruction signal at a prescribed level corresponding to a fixed input from a driving instruction unit so as to control the supply of an electric power to a load from a battery in accordance with a pulse-width modulation control by the driving control signal, the load control unit comprising:
- a reference voltage generating unit that generates a reference voltage of a triangle wave on the basis of the voltage of the battery;
a first charging/discharging unit that charges and discharges to generate the triangle wave at a constant current proportional to the voltage of the battery;
a second charging/discharging unit connected in series to the first charging/discharging unit to charge and discharge in reverse to the charge and discharge of the first charging/discharging unit;
a first comparing unit that compares the voltage of the first charging/discharging unit with the reference voltage and switches between the charge and discharge of the first charging/discharging unit so as to generate the triangle wave; and
a second comparing unit that compares a divided voltage obtained by resistively dividing the voltage of the battery with the voltage of the triangle wave generated by the first comparing unit so as to generate a PWM pulse for driving the load,wherein the ratio of capacities between the first and second charging/discharging units approximates to the ratio of resistances for obtaining the divided voltage.
2 Assignments
0 Petitions
Accused Products
Abstract
A load control unit for controlling the supply of an electric power to a load from battery in accordance with a pulse-width modulation control includes: a reference voltage generating unit; a first charging/discharging unit; a second charging/discharging unit connected in series to the first charging/discharging unit to charge and discharge in reverse to those of the first charging/discharging unit; a first comparing unit that compares the voltage of the first charging/discharging unit with the reference voltage and switches between the charge and discharge of the first charging/discharging unit to generate a triangle wave; and a second comparing unit that compares a divided voltage by dividing the voltage of the battery with the voltage of the triangle wave generated by the first comparing unit to generate a PWM pulse. The ratio of capacities between the first and second charging/discharging units approximates to the ratio of resistances for obtaining the divided voltage.
12 Citations
3 Claims
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1. A load control unit that generates a driving control signal whose level is changed by a prescribed frequency and duty in accordance with a driving instruction signal at a prescribed level corresponding to a fixed input from a driving instruction unit so as to control the supply of an electric power to a load from a battery in accordance with a pulse-width modulation control by the driving control signal, the load control unit comprising:
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a reference voltage generating unit that generates a reference voltage of a triangle wave on the basis of the voltage of the battery; a first charging/discharging unit that charges and discharges to generate the triangle wave at a constant current proportional to the voltage of the battery; a second charging/discharging unit connected in series to the first charging/discharging unit to charge and discharge in reverse to the charge and discharge of the first charging/discharging unit; a first comparing unit that compares the voltage of the first charging/discharging unit with the reference voltage and switches between the charge and discharge of the first charging/discharging unit so as to generate the triangle wave; and a second comparing unit that compares a divided voltage obtained by resistively dividing the voltage of the battery with the voltage of the triangle wave generated by the first comparing unit so as to generate a PWM pulse for driving the load, wherein the ratio of capacities between the first and second charging/discharging units approximates to the ratio of resistances for obtaining the divided voltage. - View Dependent Claims (2, 3)
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Specification
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- Resources
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Current AssigneeYazaki Corporation
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Original AssigneeYazaki Corporation
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InventorsKubota, Kazuhiro, Yabe, Hiroo, Sasahara, Masato, Tsubaki, Kazuya
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Primary Examiner(s)Berhane; Adolf
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Assistant Examiner(s)Mehari; Yemane
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Application NumberUS12/219,585Publication NumberTime in Patent Office957 DaysField of Search323/288, 320/106, 320/107, 327/131, 327/132, 327/138US Class Current323/288CPC Class CodesH05B 39/047 with pulse width modulation...H05B 47/10 Controlling the light sourceY02B 20/00 Energy efficient lighting t...
