JP3009726U - Automatic power switch - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The switching time can be shortened, the load, for example, the computer is not adversely affected, and installation work and wiring work to existing equipment can be simplified. [Structure] When a power failure occurs in a utility power supply, an exciting current is sent to a B coil 1f of a solid-state relay changeover switch 1, and the B coil 1f is excited to change the same.
The B-side armature 1d of the mechanical contact portion 1a is attracted, the mechanical contact portion 1a swings from the A side to the B side around the fulcrum 1b, and electricity is supplied from the standby power source to the load. When the regular power supply is restored, the exciting current is sent to the A coil 1e of the changeover switch 1, the A coil 1e is excited, and the A side armature 1c of the mechanical contact portion 1a of the changeover switch 1 is attracted to the same. The mechanical contact portion 1a swings from the B side to the A side around the fulcrum 1b, and electricity is supplied from the regular power source to the load.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic power source switching device that connects a standby power source to a load when the regular power source fails and connects the regular power source to the load when the regular power source is restored.

[0002]

[Prior art]

 In the conventional automatic power switching device, the solenoid of the power failure detector is de-energized during a power failure of the regular power supply, the contact of the power failure detector is switched from a contact to b contact, and the B coil of the changeover switch is connected through this b contact. Excitation, the contact of the changeover switch is switched, and the standby power supply is connected to the load.

[0003]

[Problems to be solved by the device]

 In the conventional automatic power supply switching device, it takes 10 to 15 msec from the occurrence of a power failure to the turning on of the b contact of the power failure detector, and the changeover switch is switched after receiving the switching command from the power failure detector. It takes 30 to 40 msec. And when both are combined, it takes 40 to 55 msec until the standby power supply is connected to the load, which adversely affects the load, for example, the computer.

In the case of an instantaneous power failure of 30 msec or less, the computer or the like is hardly affected, but in the case of an instantaneous power failure of 30 msec or more, the computer or the like is adversely affected. The present invention is proposed in view of the above problems, and the purpose thereof is to set the entire switching time (the time from the occurrence of a power failure until the changeover switch is operated to connect the auxiliary power supply to the load) to 15 to The point is to provide an automatic power supply switching device that can be shortened within 20 msec and does not adversely affect the load, for example, the computer, and can simplify the installation work and wiring work to existing equipment.

[0005]

[Means for Solving the Problems] To achieve the above object, an automatic power source switching device according to the present invention is provided with a mechanical contact portion that can swing about a fulcrum of a central portion and a mechanical contact portion of the mechanical contact portion. Switch the mechanical contact point to the connection position between the regular power supply and the load by sucking the A side armature attached to one end. Suction the B side armature attached to the A coil and the other end of the mechanical contact point. Therefore, the changeover switch having the B coil that switches the mechanical contact part to the connection position between the standby power supply and the load, and the comparator and the comparator that detect the presence or absence of the regular power supply and send out a power failure detection signal when a power failure occurs The integrated circuit that turns on the transistor in response to the power failure signal from the solid state relay that excites the B coil of the changeover switch when the transistor turns on, and the above when the power is restored And comprising an electronic power failure detector and a voltage relay for exciting the A coil over switch (請 Motomeko 1).

In the automatic power switching device, a device including a changeover switch, an electronic power failure detector, and a terminal block may be housed in a box (claim 2).

[0007]

[Action]

 The automatic power supply switching device of the present invention is configured as described above. (1) When a power failure occurs in the utility power supply for some reason while the electricity is being supplied from the utility power supply to the load, an electronic type The comparator of the power failure detector detects a power failure, sends a power failure detection signal to the accumulation circuit, turns on the transistor with the integrated circuit, sends an excitation signal from the solid state relay to the B coil of the changeover switch, and sends the B coil. When excited, the B-side armature of the mechanical contact of the changeover switch is attracted, and the mechanical contact is oscillated (switched) from the A side to the B side around the fulcrum to switch from the standby power supply to the load. Supply electricity. At that time, the three-terminal regulator supplies a constant current to the solid state relay for 20 msec or more, and keeps the solid state relay ON during that time. (2) When the utility power is restored, the a contact of the voltage relay of the electronic power failure detector is turned on, and the exciting current is sent to the A coil of the changeover switch to excite the A coil and to excite the machine of the changeover switch. The armature on the A side of the static contact point is sucked, and the mechanical contact point is swung (switched) from the B side to the A side around the fulcrum, and electricity is supplied from the regular power supply to the load.

[0008]

【Example】

 An automatic power source switching device of the present invention will now be described with reference to an embodiment shown in FIGS. 1 to 6. In FIG. 1 and FIG. The mechanical contact 1a that can be swung to and the A-side armature 1c attached to one end of the mechanical contact 1a is attracted to switch the mechanical contact 1a to the connection position between the regular power supply and the load. It has an A coil 1e and a B coil 1f for switching the mechanical contact 1a to the connection position between the standby power source and the load by attracting the B side armature 1d attached to the other end of the mechanical contact 1a. are doing.

2 is an electronic power failure detector, 3 is a customer connection input (common power supply) terminal block (TB), 4 is a customer connection input (standby power supply) terminal block (TB), 5 is a customer connection input ( Load) Terminal block (TB), 6 is a board on which the above equipments 1 to 5 are mounted, 7 is a box storing the board 6 and the above equipments 1 to 5, and the customer connection input terminal block (TB) 3 is connected to the electric wire of the regular power supply, the customer connection input terminal block (TB) 4 is connected to the electric wire of the standby power supply, and the customer connection input terminal block (TB) 5 is connected to the load. The wire is connected.

FIG. 3 is a circuit diagram of the electronic power failure detector 2. The electronic power failure detector 2 includes a voltage relay 84 that sends an exciting current to the A coil 1e of the changeover switch 1 when the utility power is restored, rectifiers D1 and D2 that rectify AC power into DC power, and a utility power supply. Comparator IC2 that detects the presence / absence of a power failure and sends a power failure detection signal when a power failure occurs, an integrated circuit IC3 that turns on transistor Q1 by a power failure signal from the comparator IC2, and the above when the transistor Q1 turns on. A solid state relay SSR that sends an exciting current to the B coil 1f of the changeover switch 1 and a constant current when the transistor Q1 is turned on are supplied to the solid state relay SSR and turned on for 20 msec or more. And a three-terminal regulator IC1.

FIGS. 4 (a) and 4 (b) are diagrams for explaining the operation when electricity is supplied from the regular power source to the load, and FIGS. 5 (a) and 5 (b) show electricity supplied from the standby power source to the load. FIG. 6 is an explanatory diagram of the operation when the operation is in progress. Next, the operation of the automatic power source switching device shown in FIGS. 1 to 6 will be specifically described. (1) If a power failure occurs in the service power supply for some reason while the power is being supplied from the service power supply to the load, the comparator IC2 of the electronic power failure detector 2 detects the power failure and detects the power failure detection signal. Is sent to the integrated circuit 1C3, the transistor Q1 is turned on by the integrated circuit IC3, the exciting current is sent to the B coil 1f of the changeover switch 1 through the solid state relay SSR, and the B coil 1f is excited. The B-side armature 1d of the mechanical contact portion 1a of the switching switch 1 is attracted, the mechanical contact portion 1a swings (switches) from the A side to the B side around the fulcrum 1b, and the standby power supply is switched. Supplies electricity to the load.

At that time, the three-terminal regulator IC1 supplies a constant current to the solid state relay SSR for 20 msec or more, and the solid state relay SSR is held in the ON state during that time (see FIG. 5). (2) When the regular power supply is restored, the a contact of the voltage relay 84 of the electronic power failure detector 2 is turned on, the exciting current is sent to the A coil 1e of the changeover switch 1, and the A coil 1e is excited. Then, the A-side armature 1c of the mechanical contact portion 1a of the changeover switch 1 is sucked, and the mechanical contact portion 1a swings from the B side to the A side around the fulcrum 1b (switched). , Electricity is supplied from the utility power source to the load (see FIG. 4).

[0013]

[Effect of device]

 The automatic power switching device of the present invention is configured as described above, and can achieve the following effects. (1) In the past, a mechanical relay was used to detect a power failure, and it took 10 to 15 msec to output a switching signal. When a power failure occurs, the comparator outputs a power failure detection signal and the comparator turns on the transistor by the power failure signal from the comparator. When the transistor turns on, the B coil of the changeover switch is excited. An electronic power failure detector having a solid-state relay and a voltage relay that excites the A coil of the above-mentioned changeover switch when power is restored to the normal power supply is used, and it is sufficient to issue a changeover signal in a short time of 3 to 5 msec. The switching time can be shortened to 1/3, which allows the total switching time (the time from the occurrence of a power failure until the changeover switch is activated and the auxiliary power supply is connected to the load). Can be shortened within 15 to 20 msec, and the load, for example, a computer, will not be adversely affected. (2) In the past, when installing an automatic power switch on site, it was necessary to combine and wire each part, and when installing it on existing equipment, it was a large-scale work, but this invention The automatic power supply switching equipment of this product stores the equipment including the changeover switch, the electronic power failure detector and the terminal block in the box, which simplifies the wiring work at the site and allows the installation work to the existing equipment. Wiring work can be simplified.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an automatic power switch of the present invention.

FIG. 2 is a side view of the automatic power switching device.

FIG. 3 is a circuit diagram of an electronic power failure detector of the automatic power switching device.

4 (a) and 4 (b) are operation explanatory views when electricity is supplied from a regular power source to a load.

5 (a) and 5 (b) are operation explanatory views when supplying electricity from a standby power supply to a load.

FIG. 6 is an operation explanatory diagram of the same automatic power supply switching device.

[Explanation of symbols]

1 Changeover switch 1a Mechanical contact part 1b Support point of mechanical contact part 1a 1c A side armature 1d B side armature 1e A coil 1f B coil 2 Electronic power failure detector 3 Customer connection input (common power supply) Terminal block (TB) 4 Customer connection input (spare power supply) terminal block (TB) 5 Customer connection input (load) terminal block (TB) 6 Board 7 Box 84 Voltage relay D1, D2 Rectifier 1C1 Three-terminal regulator IC2 Comparator IC3 Integrated circuit Q1 Transistor SSR Solid state relay

Claims (2)

[Scope of utility model registration request] 1. A mechanical contact part swingable about a fulcrum in the center and an A-side armature attached to one end of the mechanical contact part are attracted to the mechanical contact part for loading a constant power source and a load. It has an A coil for switching to the connection position with and a B coil for switching the mechanical contact part to the connection position between the standby power source and the load by attracting the B side armature attached to the other end of the mechanical contact part. A changeover switch, a comparator that detects the presence or absence of a regular power supply, and sends a power failure detection signal when a power failure occurs, and an integrated circuit that turns on a transistor by a power failure signal from the comparator, and the above changeover switch when the transistor turns on And an electric power failure detector having a solid state relay for exciting the B coil and a voltage relay for exciting the A coil of the changeover switch when the power source is restored. An automatic power switch that is characterized by 2. The automatic power source changer according to claim 1, wherein a device including the changeover switch, the electronic power failure detector, and a terminal block is housed in a box.