CN202854223U

CN202854223U - Power failure detection device

Info

Publication number: CN202854223U
Application number: CN 201220519402
Authority: CN
Inventors: 蔡志端; 沈应华; 王培良
Original assignee: HUZHOU JUNENG AUTOMATION TECHNOLOGY Co Ltd
Current assignee: HUZHOU JUNENG AUTOMATION TECHNOLOGY Co Ltd
Priority date: 2012-10-10
Filing date: 2012-10-10
Publication date: 2013-04-03
Anticipated expiration: 2022-10-10

Abstract

Disclosed is a power failure detection device. If a 220V alternating-current mains supply supplies power normally, a second diode and a fourth diode are switched off, a third diode is switched on, a chip outputs a 5V voltage, an input end outputs high level, and an 8V spare battery does not supply power; when power fails, the second diode and the fourth diode are switched on, the third diode is switched off, the input end outputs low level through a voltage dividing resistor, the spare battery starts to supply power, and the chip continues to output a 5V voltage to make a micro controller continue to work; and the micro controller monitors the level change at the input end in real time, there is no power failure if it is high level and there is a power failure if it is low level, and thus power failure can be detected automatically. The power failure detection device is simple in circuit structure and can be used to detect power failure accurately, power can be supplied to the micro controller even during power failure period, the normal operation of a micro controller of an elevator cannot be affected, and the safe operation of the elevator can be ensured.

Description

A kind of power-off fault pick-up unit

Technical field:

The utility model relates to the elevator control aggregate technical field, more specifically to a kind of power-off fault pick-up unit.

Background technology:

In the special equipments such as elevator, power-off fault can make personal life and property safety be subject to serious threat, so need a kind of power-off fault checkout equipment of design, under the state that has a power failure, guarantees that the elevator microcontroller still can work.

The utility model content:

The purpose of this utility model is exactly the deficiency for prior art, and provide a kind of power-off fault pick-up unit, its circuit structure is simple, power-off fault detects accurately, simultaneously in situation about having a power failure, still to the microcontroller power supply, do not affect the normal operation of elevator microcontroller, guarantee lift running safety.

Technology solution of the present utility model is as follows:

A kind of power-off fault pick-up unit, the 220V AC power is through transformer output 9V alternating current, and output 5V voltage is the microcontroller power supply after rectifier bridge rectification, the first electric capacity and the second capacitor filtering, chip voltage stabilizing;

If 220 volts of electric main supplies are normal, the second diode and the cut-off of the 4th diode, the 3rd diode current flow, chip output this moment 5V voltage, input end output high level, voltage is that 8 volts reserve battery is not powered; If have a power failure, then the second diode and the 4th diode current flow, the cut-off of the 3rd diode, the input end is by the divider resistance output low level, and reserve battery is opened power supply, and chip continues output 5V voltage and also works on for microcontroller;

Microcontroller Real-Time Monitoring input end level changes, if high level then represents not have power-off fault, or then represents to have power-off fault for low level, thereby automatically detects power-off fault.

The beneficial effects of the utility model are:

Its circuit structure is simple, and power-off fault detects accurately, in situation about having a power failure, still to the microcontroller power supply, does not affect the normal operation of elevator microcontroller simultaneously, guarantees lift running safety.

Description of drawings:

Fig. 1 is structural representation of the present utility model

Embodiment:

Embodiment: as shown in Figure 1, a kind of power-off fault pick-up unit, the 220V AC power is through transformer T1 output 9V alternating current, and output 5V voltage is the microcontroller power supply after rectifier bridge D1 rectification, the first capacitor C 1 and 2 filtering of the second capacitor C, chip IC 17805 voltage stabilizings;

If 220 volts of electric main supplies are normal, the second diode D2 and the 4th diode D4 cut-off, the 3rd diode D3 conducting, chip IC 17805 is exported the 5V voltages at this moment, input end output high level, voltage is that 8 volts reserve battery BATTERY does not power; If have a power failure, then the second diode D2 and the 4th diode D4 conducting, the 3rd diode D3 cut-off, the input end is by divider resistance R2 output low level, reserve battery BATTERY opens power supply, and chip IC 17805 continues output 5V voltage and also works on for microcontroller;

Claims

1. power-off fault pick-up unit, it is characterized in that: the 220V AC power is through transformer (T1) output 9V alternating current, and output 5V voltage is the microcontroller power supply after rectifier bridge (D1) rectification, the first electric capacity (C1) and the second electric capacity (C2) filtering, chip (IC17805) voltage stabilizing;

If 220 volts of electric main supplies are normal, the second diode (D2) and the 4th diode (D4) cut-off, the 3rd diode (D3) conducting, chip this moment (IC17805) output 5V voltage, input end output high level, voltage is that 8 volts reserve battery (BATTERY) is not powered; If have a power failure, then the second diode (D2) and the 4th diode (D4) conducting, the 3rd diode (D3) cut-off, the input end is by divider resistance (R2) output low level, reserve battery (BATTERY) is opened power supply, and chip (IC17805) continues output 5V voltage and also works on for microcontroller;