Power off detection device and method
A technology of power failure detection and detection results, which is applied in the direction of measuring devices, continuity testing, and measuring electrical variables, etc., which can solve the problems of unfavorable circuit miniaturization, increased holding time, and increased circuit volume.
Pending Publication Date: 2022-03-08
REALTEK SEMICON CORP
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Problems solved by technology
To avoid the above situation, additional capacitors or capacitors with larger capacitances will be placed on the printed circuit board where the IC is located to help slow down the input voltage drop rate, thereby increasing the hold-up time; however, this approach A larger printed circuit board is required to set the capacitor, which not only increases the circuit volume and is not conducive to the miniaturization of the circuit, but also increases the cost
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[0015] The disclosure discloses a power failure detection device and method, which can be used in a client device and can increase the hold time of a dying gasp function.
[0016] figure 1 An embodiment of the power failure detection device of the present disclosure is shown. figure 1 The power failure detection device 100 includes a step-down circuit 110 , a detection voltage generation circuit 120 , a detection circuit 130 and a transmission circuit 140 . The step-down circuit 110 is or includes at least one active element (for example: a diode), and is used for according to an input voltage (V IN ) to generate an output voltage (V OUT ), wherein the output voltage is lower than the input voltage; for example, the output voltage is lower than half the voltage value of the input voltage. The detection voltage generation circuit 120 is coupled between the step-down circuit 110 and a low voltage terminal (GND), and is used to generate a detection voltage (V DET ), wherein t...
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The embodiment of the invention relates to a power-off detection device which can start to send a power-off early warning in advance so as to ensure that the power-off early warning is sent. The device comprises a step-down circuit, a detection voltage generation circuit, a detection circuit and a transmission circuit. The step-down circuit is at least one active element or comprises the at least one active element and is used for generating an output voltage according to an input voltage, and the output voltage is lower than the input voltage. The detection voltage generating circuit is coupled between the step-down circuit and a low-voltage end and is used for generating a detection voltage according to the output voltage, and the detection voltage is lower than the output voltage and higher than the voltage of the low-voltage end. The detection circuit is used for generating a detection result according to the detection voltage and the trigger voltage. The transmission circuit is used for sending a power-off early warning to a far-end device when the detection result indicates that the detection voltage is lower than the trigger voltage.
Description
technical field [0001] The present application relates to a detection device and method, in particular to a power failure detection device and method. Background technique [0002] The dying gasp function is to allow the client device to have enough time to send a special data packet to the central office device after a power failure, so that the central office device can know that the reason for the disconnection of the client device is a power failure. rather than other line problems. [0003] The current power-off alarm function is to generate the divided voltage of the input voltage of the client device in the form of resistor division (for example: the divided voltage caused by the series resistance of 3.22KΩ and the resistance of 499Ω), so that the client device can When the divided voltage is lower than the trigger voltage, a special data packet is sent to notify a central office device, and the client device stops sending the special data packet when the divided vol...
Claims
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IPC IPC(8): G01R31/54G01R19/165
CPCG01R31/54G01R19/165
Inventor 王家龙黄名宏李建亿
Owner REALTEK SEMICON CORP