US 12,174,222 B2
Voltage detection device
Wei-Gen Chung, Taipei (TW); Ming-Ting Tsai, Taipei (TW); Hsi-Ho Hsu, Taipei (TW); Chun-San Lin, Taipei (TW); Wei Kao, Taipei (TW); Chen-Hao Yu, Taipei (TW); and Hsiang-Jui Hung, Taipei (TW)
Assigned to ASUSTeK COMPUTER INC., Taipei (TW)
Filed by ASUSTeK COMPUTER INC., Taipei (TW)
Filed on Oct. 20, 2022, as Appl. No. 17/969,697.
Claims priority of application No. 111131074 (TW), filed on Aug. 18, 2022.
Prior Publication US 2024/0061018 A1, Feb. 22, 2024
Int. Cl. G01R 15/04 (2006.01); H02H 3/20 (2006.01); H03F 3/45 (2006.01); H03K 17/687 (2006.01)
CPC G01R 15/04 (2013.01) [H02H 3/20 (2013.01); H03F 3/45071 (2013.01); H03K 17/687 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A voltage detection device, comprising:
a first voltage divider circuit, configured to receive an input voltage and output a comparison voltage according to the input voltage;
a comparison circuit, coupled to the first voltage divider circuit and configured to receive the comparison voltage to compare the comparison voltage with a reference voltage and determine whether to change a trigger signal according to a comparison result; and
a second voltage divider circuit, coupled to the first voltage divider circuit and configured to receive the input voltage and form a parallel structure with the first voltage divider circuit when the input voltage is greater than or equal to a predetermined voltage value to pull down the comparison voltage,
wherein the comparison circuit comprises:
an operational amplifier, having a non-inverting input terminal used to receive the comparison voltage, an inverting input terminal used to receive the reference voltage, and an output terminal generating a comparison result signal;
a buffer circuit, coupled to the operational amplifier, receiving the comparison result signal, and generating a corresponding switching signal according to the comparison result signal; and
a trigger transistor, having a first terminal used to output the trigger signal, a second terminal coupled to a ground potential, and a control terminal used to receive the switching signal, wherein the trigger transistor is controlled by the switching signal to be turned on or off to change a logic level of the trigger signal.