JPH0654446A - Power source - Google Patents

Abstract

PURPOSE:To resupply a commercial power source to an apparatus body at the time of recovering a power source interruption by providing a backup switch which is driven by a backup power source and connected at the time of a power interruption of the commercial power source in parallel with a soft switch. CONSTITUTION:A terminal computer 1 is supplied with power from a direct switching power source 2 of a power source connected to a commercial power source. The power source 2 can control an operation by a control terminal 3, which is connected to a ground through a power source switch 4 to become a hard switch provided in parallel, a soft switch 6 and a backup switch 8. Accordingly, even if a power interruption occurs so that the switch 6 is opened when only the switch 6 is connected, the switch 8 provided in parallel is connected. Thus, the commercial power source is resupplied at the time of recovering the power interruption, and an apparatus can be operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed so that even if the power switch is manually turned off, the power is not shut off by the soft switch until the processing is completed, and the power is shut off when the processing is completed. The present invention relates to a power supply device such as a computer device.

[0002]

2. Description of the Related Art A POS (Point Of Sales) system used for sales information management in a store or the like is a host computer in which a host computer and a terminal computer (electronic cash register, etc.) installed in each sales floor are networked. The sales information was centrally managed at.

[0003] Here, the daily sales information and the like stored in each terminal computer is usually sent out in response to a communication command from the host computer at night when the store is closed.

Therefore, the terminal computer is provided with a power switch for manually turning the power on and off and a soft switch for controlling the on and off of the terminal computer in parallel.

In order to respond to the communication command from the host computer at night, the terminal computer does not turn off its power even if the soft switch is turned on and the cashier turns home to turn off the power switch of the terminal computer. I was doing.

At the end of the data communication, the terminal computer itself turns off the soft switch to shut off the power supply to the terminal computer.

The circuit shown in FIG. 3 is a concrete circuit, in which a direct switching power supply 2 for inputting a commercial power supply and outputting electric power to the terminal computer 1 is connected to the terminal computer 1. The operation of this direct switching power supply 2 can be controlled by the control terminal 3,
Power is output to the terminal computer 1 when the control terminal 3 is at "L" level. The control terminal 3 is connected to the ground via a power switch 4 and a soft switch 6 including a relay 5 and the like provided in parallel.

Here, the soft switch 6 is connected to the terminal computer 1 by a control line 7, and the control signal "H" output from the terminal computer 1 is output.
The circuit is designed so that it is connected at the level and disconnected at the "L" level.

In such a structure, the power switch 4
When turned on, the control terminal 3 of the direct switching power supply 2 is connected to the ground, the control terminal 3 of the direct switching power supply 2 is set to the “L” level, power is supplied to the terminal computer 1, and the terminal computer 1 starts up.

When the soft switch 6 inputs the "H" level control signal from the terminal computer 1, the soft switch 6 also connects the control terminal 3 of the direct switching power supply 2 to the ground. Therefore, the power is not shut off even if the power switch 4 is turned off.

When the soft switch 6 inputs the "L" level control signal from the terminal computer 1, the control switch 3 connected to the soft switch 6 is disconnected from the control terminal 3 of the direct switching power supply 2 and the power is cut off. It

[0012]

When the commercial power supply of the terminal computer 1 fails, the terminal computer 1 naturally goes down and cannot respond to the communication command from the host computer. Here, if there is a power failure in the state where the power switch 4 is manually turned on, the terminal computer 1 is supplied with power again when the power failure is restored, so the terminal computer 1 starts up and the host computer Will be able to respond to communication commands from. However, if there is a power outage in a state where only the soft switch 6 is turned on, such as at night, the soft switch 6 will be turned off at the same time as the power outage. It is not supplied and cannot rise again. Therefore, the data could not be sent to the host computer.

[0013]

A power supply device having in parallel a hard switch for connecting and disconnecting a commercial power supply to the device body in accordance with a manual operation and a soft switch for connecting and disconnecting a commercial power supply to the device body according to control of the device body, A backup switch, which is driven by a backup power supply and is in a connection state when the commercial power supply fails, is provided in parallel with the soft switch.

[0014]

[Function] Even if the soft switch is disconnected due to a power failure while only the soft switch is in the connected state, the backup switch provided in parallel with the soft switch is in the connected state, and the backup switch is used for commercial operation. By maintaining the connection state of the power source to the device body, commercial power is re-supplied to the device body when the power is restored, and the device can operate.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. The same parts as those shown in the conventional example are indicated by the same reference numerals.

In this embodiment, the POS (Point of Sale)
s) It is applied to a terminal computer 1 (electronic cash register, etc.) installed in each sales floor forming the system, and this terminal computer 1 is a direct switching power supply 2 which is a power supply device connected to a commercial power supply.
Powered by.

The operation of this direct switching power supply 2 can be controlled by the control terminal 3, and power is output to the terminal computer 1 when the control terminal 3 is at "L" level. The control terminal 3 is connected to ground via a power switch 4, a soft switch 6, and a backup switch 8 which are hard switches provided in parallel.

The backup switch 8 is a latch IC driven by a backup battery (not shown).
9, a transistor 10, a relay 11 and the like. The latch IC 9 is provided with a CLK terminal, a D terminal, a Q bar terminal, and a power supply terminal. The CLK terminal is connected to the terminal computer 1 by a control line 7 to input a control signal, and the D terminal is a control line. At 12, a power fail signal output from the terminal computer 1 is connected to the terminal computer 1, the Q-bar terminal is connected to the transistor 10, and the power supply terminal is connected to a backup battery. And the transistor 1
The base terminal of 0 is connected to the Q-bar terminal of the latch IC 9, and the collector terminal is connected to the relay 11.
The emitter terminal is connected to the backup battery. Furthermore, the relay 11 has terminals 13, 1 of the electromagnet 11a.
4, the terminals 15 and 16 of the switch 11b are provided, the terminal 13 is connected to the collector terminal of the transistor 10, the terminal 14 is connected to the ground, and the terminal 15 is the control terminal 3 of the direct switching power supply 2. And the terminal 16 is connected to ground.

A battery charging circuit 17 for charging the backup battery is also provided. The battery charging circuit 17 is provided with an input terminal 18, an output terminal 19, and a ground terminal 20, the input terminal 18 is connected to the 5V output of the terminal computer 1, the output terminal 19 is connected to a backup battery, The ground terminal 20 is grounded.

In such a configuration, the power switch 4
When is turned on, the terminal computer 1 is in a state where it is ready to start up. Then, when the soft switch 6 inputs a control signal of "H" level from the terminal computer 1, the soft switch 6 is also turned on.
Even if is turned off, the power of the terminal computer 1 is not shut off, and data such as sales information can be transmitted in response to a communication command from the host computer at night.

Here, the operation when the commercial power source of the terminal computer 1 fails in the state where only the soft switch 6 is turned on will be described with reference to the timing chart of FIG.

The commercial power supply fails (T1) and the output (30V) of the direct switching power supply 2 drops to about 18V.
Then, the power fail signal output from the terminal computer 1 becomes "H" level (T2). When the voltage further drops to about 15 V, the terminal computer 1
Is reset, the control signal becomes "L" level, and the soft switch 6 is turned off (T3). At this time, the latch IC 9 having the control signal inputted to the CLK terminal latches the power fail signal inputted to the D terminal, and the Q bar terminal becomes "L" level. Then, the base terminal of the transistor 10 connected to the Q bar terminal of the latch IC 9 becomes "L" level, and the relay 1
The current of the backup battery flows through the electromagnet 11a of No. 1,
The switch 11b is connected, and the control terminal 3 of the direct switching power supply 2 and the ground are connected. Therefore, when the power failure is restored, the direct switching power supply 2 can start supplying power to the terminal computer 1 again, and the terminal computer 1 can be restarted. Then, the soft switch 6 inputs the "H" level control signal again from the terminal computer 1 to be turned on.

As described above, in the terminal computer 1, even if there is a power failure while the power supply state is maintained only by the soft switch 6 at night or the like, when the power failure is restored, the communication command from the host computer is restarted. In response to this, it is possible to perform business such as data transmission of sales information.

When the work is completed, the terminal computer 1 sets the control signal to the "L" level to turn off the power of the terminal computer 1 and turns off the soft switch 6 (T5). At this time, the latch IC 9 having the control signal inputted to the CLK terminal receives the power fail signal inputted to the D terminal (the power supply voltage is 18 V when the power is turned on).
When it exceeds (T4), it becomes "L" level)
Is latched, and the Q bar terminal becomes "H" level. Then, the base terminal of the transistor 10 connected to the Q bar terminal of the latch IC 9 becomes "H" level, and the relay 11
The current of the backup battery flowing through the electromagnet 11a is cut off, the switch 11b is cut off, the direct switching power supply 2 stops supplying power, and the terminal computer 1 stops.

[0025]

As described above, the present invention has, in parallel, the hard switch for connecting and disconnecting the commercial power source to the apparatus body according to the manual operation and the soft switch for connecting and disconnecting the commercial power source to the apparatus body according to the control of the apparatus body. In the power supply device, a backup switch that is driven by a backup power supply and that is in a connection state when the commercial power supply fails is provided in parallel with the soft switch, so a power failure occurs when only the soft switch is in a connection state. Even if the soft switch is turned off, the commercial power can be re-supplied to the main body of the device when the power is restored, and the device can be restarted so that the device can continue the work.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a timing chart.

FIG. 3 is a circuit diagram showing a conventional example.

[Explanation of symbols]

 1 Device body 4 Hard switch 6 Soft switch 8 Backup switch

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location H02J 9/00 Z 4235-5G

Claims (1)

[Claims] 1. A power supply device having, in parallel, a hard switch for connecting and disconnecting a commercial power source to the device body in accordance with a manual operation and a soft switch for connecting and disconnecting a commercial power source to the device body according to the control of the device body, driven by a backup power supply. A power supply device comprising a backup switch, which is connected to the commercial power supply in the event of a power failure, in parallel with the soft switch.