Voltage detection device

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.