CN211225921U

CN211225921U - Power failure detection circuit applied to elevator backup power supply

Info

Publication number: CN211225921U
Application number: CN201921873797.0U
Authority: CN
Inventors: 严红松; 柳杰
Original assignee: Wuhan Jinsong Technology Co ltd
Current assignee: Wuhan Jinsong Technology Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-08-11
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses a be applied to elevator backup power's detection circuitry that falls, including film capacitor F1, resistance R1, diode D1, opto-coupler Q1, electric capacity C1, film capacitor F2, resistance R2, diode D2, opto-coupler Q2, electric capacity C2, diode D3 and diode D4; the three-phase power is mains supply; a connecting point of a pin 4 of the optocoupler Q1 and the upper end of the capacitor C1 is a signal acquisition point D _ AB for acquiring signals; and a connection point of the pin 4 of the optocoupler Q2 and the upper end of the capacitor C2 is a signal acquisition point D _ BC used for acquiring signals. This power failure detection circuit of elevator backup power is through measuring the voltage between A, B looks and B, C looks, through opto-coupler isolation output, and output voltage signal input adopts the port for singlechip ADC, and this circuit structure is simple, has both practiced thrift the cost, has also reduced the installation volume, possesses the power failure simultaneously and detects, lacks looks detection, phase sequence detection function.

Description

Power failure detection circuit applied to elevator backup power supply

Technical Field

The utility model relates to a fall electric detection circuitry specifically is a fall electric detection circuitry who is applied to elevator backup power.

Background

As society advances, more and more high buildings are built, which are equipped with elevators controlled by an elevator control system. The elevator control system is internally provided with the automatic rescue device of the elevator, and when the power is cut off, the automatic rescue device supplies power to the elevator control system to ensure that the elevator safely runs to a flat-bed position. Meanwhile, different power supply faults need to be judged to prevent safety accidents caused by reverse phase sequence connection.

In order to make correct measures for different power supply faults, a detection circuit is required to be designed, so that the fault condition of the mains supply can be identified, and bases are provided for different measures. At present, most of common power loss detection circuits adopt Hall voltage sensors or current transformers for measurement, and the existing voltage sensors and current sensors are high in cost and large in size.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a be applied to elevator backup power's fall electric detection circuitry to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a power failure detection circuit applied to an elevator backup power supply comprises a film capacitor F1, a resistor R1, a diode D1, an optocoupler Q1, a capacitor C1, a film capacitor F2, a resistor R2, a diode D2, an optocoupler Q2, a capacitor C2, a diode D3 and a diode D4; the three-phase power is mains supply; the A-phase port of the three-phase power is connected with the upper end of a film capacitor F1 and the left end of a resistor R1; the right end of the resistor R1 is connected with the cathode at the upper end of the diode D1 and the pin 1 of the optocoupler Q1; a pin 4 of the optocoupler Q1 is connected with the upper end of a capacitor C1, and the upper end of a capacitor C1 is connected with a +5V power supply; the pin 3 of the optocoupler Q1 is grounded with the lower end of the capacitor C1; a pin 2 of the optocoupler Q1 is connected with the anode at the lower end of the diode D1 and the anode at the right end of the diode D2; the cathode at the left end of the diode D2 is connected with the lower end of the film capacitor F1 and the phase B port of the three-phase power;

the B-phase port of the three-phase power is also connected with the upper end of a film capacitor F2 and the left end of a resistor R2; the right end of the resistor R2 is connected with the cathode at the upper end of the diode D3 and the pin 1 of the optocoupler Q2; a pin 4 of the optocoupler Q2 is connected with the upper end of a capacitor C2, and the upper end of a capacitor C2 is connected with a +5V power supply; the pin 3 of the optocoupler Q2 and the lower end of the capacitor C2 are both grounded; a pin 2 of the optocoupler Q2 is connected with the anode at the lower end of the diode D3 and the anode at the right end of the diode D4; the cathode at the left end of the diode D4 is connected with the lower end of the film capacitor F2 and the C-phase port of the three-phase power;

a connecting point of a pin 4 of the optocoupler Q1 and the upper end of the capacitor C1 is a signal acquisition point D _ AB for acquiring signals; and a connection point of the pin 4 of the optocoupler Q2 and the upper end of the capacitor C2 is a signal acquisition point D _ BC used for acquiring signals.

As a further aspect of the present invention: the resistor R1 and the resistor R2 used for limiting the current are cement resistors, and the resistance values of the cement resistors are both 400K omega.

As a further aspect of the present invention: the light coupler Q1 and the light coupler Q2 used for isolation are of the type EL 817D-F.

As a further aspect of the present invention: the type of the diode D1, the diode D2, the diode D3 and the diode D4 for unidirectional conduction is 1N 4007.

As a further aspect of the present invention: the thin film capacitor F1 and the thin film capacitor F2 for filtering are in the model of FL 600; the capacitance of the capacitor C1 and the capacitor C2 used for filtering is 10 nf.

As a further aspect of the present invention: the device also comprises a resistor R3 and a resistor R4; the left end of the resistor R3 is connected with the upper end of the capacitor C1, and the right end of the resistor R3 is connected with a +5V power supply; the left end of the resistor R4 is connected with the upper end of the capacitor C2, and the right end of the resistor R4 is connected with a +5V power supply; the resistance of the resistor R3 and the resistor R4 for limiting current is 2K omega.

Compared with the prior art, the beneficial effects of the utility model are that: this circuit is through measuring A, B voltage between looks and the B, C looks, through opto-coupler isolation output, and output voltage signal input adopts the port for singlechip ADC, and this circuit structure is simple, has both practiced thrift the cost, has also reduced the installation volume, possesses simultaneously that the power failure detects, lack looks detection, phase sequence detection function.

Drawings

Fig. 1 is a schematic structural diagram of a power failure detection circuit applied to an elevator backup power supply in embodiment 1.

Fig. 2 is a schematic structural diagram of a power failure detection circuit applied to an elevator backup power supply in embodiment 2.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Example 1

Referring to fig. 1, the present embodiment provides a power failure detection circuit applied to an elevator backup power supply, including a film capacitor F1, a resistor R1, a diode D1, an optocoupler Q1, a capacitor C1, a film capacitor F2, a resistor R2, a diode D2, an optocoupler Q2, a capacitor C2, a diode D3, and a diode D4; the three-phase power is mains supply; the A-phase port of the three-phase power is connected with the upper end of a film capacitor F1 and the left end of a resistor R1; the right end of the resistor R1 is connected with the cathode at the upper end of the diode D1 and the pin 1 of the optocoupler Q1; a pin 4 of the optocoupler Q1 is connected with the upper end of a capacitor C1, and the upper end of a capacitor C1 is connected with a +5V power supply; the pin 3 of the optocoupler Q1 is grounded with the lower end of the capacitor C1; a pin 2 of the optocoupler Q1 is connected with the anode at the lower end of the diode D1 and the anode at the right end of the diode D2; the cathode at the left end of the diode D2 is connected with the lower end of the film capacitor F1 and the phase B port of the three-phase power;

The types of the resistor R1 and the resistor R2 for current limiting are not limited, and in this embodiment, preferably, the resistor R1 and the resistor R2 for current limiting are cement resistors and their resistances are both 400K Ω.

The models of the optocoupler Q1 and the optocoupler Q2 for isolation are not limited, and in this embodiment, the model of the optocoupler Q1 and the optocoupler Q2 for isolation is preferably EL 817D-F.

The types of the diode D1, the diode D2, the diode D3, and the diode D4 for unidirectional conduction are not limited, and in the present embodiment, the types of the diode D1, the diode D2, the diode D3, and the diode D4 for unidirectional conduction are preferably 1N 4007.

The types of the film capacitor F1, the film capacitor F2, the capacitor C1 and the capacitor C2 for filtering are not limited, and in this embodiment, the types of the film capacitor F1 and the film capacitor F2 for filtering are preferably FL 600; the capacitance of the capacitor C1 and the capacitor C2 used for filtering is 10 nf.

The working principle of the embodiment is as follows: assume that the line voltage between the A, B phases and the line voltage between the B, C phases are both positive. When power supply is normal, the signal acquisition points D _ AB and D _ BC are both low level; when the mains supply is powered off, the signal acquisition points D _ AB and D _ BC are both at high level; when a short-time phase-missing fault occurs, if the phase A is missing, the D _ AB is at a high level, the D _ BC is at a low level, if the phase B is missing, both the D _ AB and the D _ BC are at a high level, and if the phase C is missing, the D _ AB is at a low level, and the D _ BC is at a high level.

Meanwhile, the line voltage between the signal acquisition points D _ AB is advanced by 120 degrees from the line voltage between the signal acquisition points BC under the normal condition, so that the time of the low-level signal appearing at the signal acquisition points D _ AB is advanced by 120 degrees from the time of the low-level signal appearing at the signal acquisition points D _ BC, and if the phase sequence is reversed, if the phase A is reversed, the time of the low-level signal appearing at the signal acquisition points D _ AB is advanced by 240 degrees from the time of the low-level signal appearing at the signal acquisition points D _ BC; if the phase B is opposite to the phase C, delaying the time of low-level signals appearing at the signal acquisition point D _ AB by 120 degrees after the time of low-level signals appearing at the signal acquisition point D _ BC; if the phase A is opposite to the phase C, the time for the signal acquisition point D _ AB to appear low level signals lags the time for the signal acquisition point D _ BC to appear low level signals by 120 degrees.

Example 2

Referring to fig. 2, the embodiment is further improved on the basis of embodiment 1, and the improvement is as follows: the device also comprises a resistor R3 and a resistor R4; the left end of the resistor R3 is connected with the upper end of the capacitor C1, and the right end of the resistor R3 is connected with a +5V power supply; the left end of the resistor R4 is connected with the upper end of the capacitor C2, and the right end of the resistor R4 is connected with a +5V power supply; the resistances of the resistor R3 and the resistor R4 for current limiting are not limited, and in this embodiment, it is preferable that the resistances of the resistor R3 and the resistor R4 for current limiting are 2K Ω.

It should be noted that, as is obvious to a person skilled in the art, the invention is not limited to details of the above-described exemplary embodiments, but can be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Claims

1. A power failure detection circuit applied to an elevator backup power supply is characterized by comprising a film capacitor F1, a resistor R1, a diode D1, an optocoupler Q1, a capacitor C1, a film capacitor F2, a resistor R2, a diode D2, an optocoupler Q2, a capacitor C2, a diode D3, a diode D4 and three-phase power; the three-phase power is mains supply, and an A-phase port of the three-phase power is connected with the upper end of the film capacitor F1 and the left end of the resistor R1; the right end of the resistor R1 is connected with the cathode at the upper end of the diode D1 and the pin 1 of the optocoupler Q1; a pin 4 of the optocoupler Q1 is connected with the upper end of a capacitor C1, and the upper end of a capacitor C1 is connected with a +5V power supply; the pin 3 of the optocoupler Q1 is grounded with the lower end of the capacitor C1; a pin 2 of the optocoupler Q1 is connected with the anode at the lower end of the diode D1 and the anode at the right end of the diode D2; the cathode at the left end of the diode D2 is connected with the lower end of the film capacitor F1 and the phase B port of the three-phase power;

2. The power failure detection circuit applied to the elevator backup power supply according to claim 1, wherein the resistor R1 and the resistor R2 for limiting current are cement resistors and have resistance values of 400 kOmega.

3. The power failure detection circuit applied to the elevator backup power supply as claimed in claim 2, wherein the optocoupler Q1 and the optocoupler Q2 for isolation are of the type EL 817D-F.

4. The power failure detection circuit applied to the backup power supply of the elevator as claimed in claim 2, wherein the model of the diode D1, the diode D2, the diode D3 and the diode D4 for one-way conduction is 1N 4007.

5. The power failure detection circuit applied to the elevator backup power supply according to claim 2, wherein the type of the film capacitor F1 and the type of the film capacitor F2 used for filtering are FL 600; the capacitance of the capacitor C1 and the capacitor C2 used for filtering is 10 nf.

6. The power failure detection circuit applied to the elevator backup power supply according to claim 1, further comprising a resistor R3 and a resistor R4; the left end of the resistor R3 is connected with the upper end of the capacitor C1, and the right end of the resistor R3 is connected with a +5V power supply; the left end of the resistor R4 is connected with the upper end of the capacitor C2, and the right end of the resistor R4 is connected with a +5V power supply; the resistance of the resistor R3 and the resistor R4 for limiting current is 2K omega.