Patent ID: 11876513
Assignee: HIMAX TECHNOLOGIES LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A low power consumption boost circuit for providing high driving voltage of a touch circuit, comprising:
a charge pump circuit comprising:
an input terminal receiving a system voltage;
a positive output terminal outputting a positive output voltage twice the system voltage; and
a negative output terminal outputting a negative output voltage with opposite polarity as the system voltage;

a first digital-to-analog converter (DAC), wherein the positive output terminal and a ground terminal are connected to the first DAC to supply power to the first DAC;
a second DAC, wherein the negative output terminal is connected to the second DAC to supply power to the second DAC;
a first switch connected between the first DAC and the touch circuit, wherein the first DAC is connected between the charge pump circuit and the first switch; and
a second switch connected between the second DAC and the touch circuit, wherein the second DAC is connected between the charge pump circuit and the second switch;
wherein the touch circuit is alternately driven through the first DAC and the second DAC by controlling the first switch and the second switch to switch on alternately;
wherein the first switch and the second switch are utilized such that one of the first DAC and the second DAC is selected to be connected to the touch circuit for driving the touch circuit.