KR20000000837A - AUTOMATIC power BLOCKING DEVICE OF CASH REGISTER - Google Patents

Abstract

PURPOSE: An automatic power blocking device of a cash register is provided to turn off power automatically when a state without a key input continues for a long time under the condition of power-on. CONSTITUTION: The automatic power blocking device of a cash register comprises: a power unit(10) for generating a direct current voltage by decompressing, rectifying and leveling a common alternating power; a power switch installed between the common alternating power and the power unit; a regulator for generating the direct current voltage after removing a ripple in the direct voltage generated in the power unit; a key scan unit for sensing that a key is input.

Description

Automatic shut-off of cash register

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic power off device of a cash register, and more particularly, to an automatic power off device of a cash register which enables the power to be automatically turned off when there is no key input for a long time while the power is on. .

In general, a cash register refers to a device used to facilitate information management by processing various data associated with the sale of a product and informing a user of a result. It ranges from point of sales system to comprehensively manage the distribution economy such as research. Hereinafter, in the present specification, the term cash register is used as a broad concept including a low-end cash register to a POS terminal.

1 is a schematic block diagram of a conventional cash register having a power saving function. As shown in FIG. 1, the electrical configuration of a conventional cash register having a power saving function is used to display various information related to a transaction under the control of the microprocessor 20, which controls the overall operation of the device, and the microprocessor 20. Money storage under the control of the microprocessor 20, the display driver 32 for driving the indicator, the printer driver 34 for driving the printer for issuing documents for customer receipts and various processing results under the control of the microprocessor 20, and the microprocessor 20. Drawer driver 36 that opens and closes the drawer, program memory and data memory, logic circuit unit 30 that operates with a logic voltage (VCC) of a predetermined size, and direct current after rectifying and smoothing a commercial AC power supply. The power supply unit 10 that generates the voltage, and removes the ripple included in the unstable DC voltage generated from the power supply unit 10 more stable DC power (E.g., 24VDC) comprises a first regulator 12, second regulator 14 for outputting by converting the DC voltage generated in the power unit 10 in a highly reliable logic voltage (VCC) for generating. In the above configuration, when the user turns on a power switch implemented by a slide switch (not shown) or the like, a predetermined DC voltage VDC is generated by the first regulator 12 so that the indicator driver 32 and the printer driver 34 And a logic voltage VCC are generated by the second regulator 14 and supplied to the microprocessor 20 and the logic circuit unit 30. It will work.

Meanwhile, the Zener diodes ZD1 and D1 are used by the first regulator 12 to generate the DC voltage VDC. In the related art, the microprocessor 20 has no key input for a predetermined time or more. If it is continued, the transistor Q1 is turned on by outputting a high level signal from the output terminal P1. Accordingly, the corresponding portion of the power supply unit 10 is grounded, and as a result, the power supply through the first regulator 12 to the display driver 32, the printer driver 34, and the drawer driver 36 is not performed, thereby making money. The register will operate in power saving mode.

However, even if a conventional cash register having a power saving function operates in the power saving mode as described above, various logic circuit parts including a microprocessor are continuously applied with a logic voltage through a second regulator, so the power saving effect is not satisfactory. have.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and automatically shuts off the power of the cash register to maximize the power saving capability by automatically turning off the power when there is no key input for a long time in the power-on state. The object is to provide a device.

Automatic power cut-off device of the cash register of the present invention for achieving the above object is a power supply for generating a DC voltage by reducing, rectifying and smoothing a commercial AC power; A power switch interposed between the commercial AC power supply and the power supply unit; A regulator for generating a DC voltage having various sizes after removing the ripple from the DC voltage generated by the power supply unit; A kisscan unit detecting whether a key is input; A switch switch to forcibly turn off the power switch; And determining whether a key is input based on a signal provided from the kisscan unit, and if the state in which there is no key input continues for a predetermined reference time T2, a control signal to the switch switching unit to turn off the power switch. It comprises a control unit for outputting.

In the above-described configuration, the regulator may be composed of a first regulator for generating a relatively high DC voltage and a second regulator for generating a DC voltage for a relatively stable and low logic circuit, in which case the controller is configured to input the key input. When the time without this time reaches the predetermined reference time T1 less than the reference time T2, it is preferable to control so that only the power of the first regulator is cut off.

The switch switching unit may include a slide switch; A permanent magnet located on a contact line of the slide switch; A magnetic body slidably mounted with respect to the permanent magnet and becoming an electromagnet when a current is applied to a coil wound around the permanent magnet and being repulsed by the permanent magnet; The rod may be fixed to an end of the magnetic body to move the slide switch to the off state when moving forward and a tension spring that pulls the magnetic body toward the permanent magnet in the element of the magnetic body.

1 is a schematic block diagram of a conventional cash register having a power saving function;

Figure 2 is a schematic block diagram of a cash register with an automatic power off device of the present invention,

3 is a schematic structural diagram of a switch switching unit in FIG. 2;

4 is a flowchart for explaining the operation of the automatic power off device of the cash register of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: power supply section, 12: first regulator,

14: second regulator, 20: microprocessor,

30: logic circuit portion, 32: indicator drive portion,

34: printer driver, 36: drawer driver,

40: switch switching part, 51: permanent magnet,

52: tension spring, 53: electromagnet,

54: working rod, 55: pressing member,

60: slide switch, R1-R3: resistance,

Q1, Q2: Transistor, D1, D2, ZD: Diode

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the automatic power off device of the cash register of the present invention.

FIG. 2 is a schematic block diagram of a cash register equipped with an automatic power off device of the present invention. The same reference numerals will be given to the same parts as those shown in FIG. 1, and detailed descriptions thereof will be omitted. As shown in FIG. 2, in the automatic power off device of the cash register of the present invention, a switch switching unit 40 is further provided to automatically cut off power by a control signal of the microprocessor 20 in addition to the existing power saving function. . In this way, the switch switching unit 40 includes a transistor Q2 and a collector terminal of the transistor Q2 and a DC voltage source connected to a corresponding output terminal P2 of the microprocessor 20 via a current limiting resistor R3. It consists of an electromagnet 53 connected between the VDC and a reverse current prevention diode D2 for absorbing back electromotive force generated during current interruption of the electromagnet coil. In FIG. 2, reference numeral 60 denotes a slide switch used as a power switch. The slide switch 60 may be forcibly turned off by the operation of the electromagnet 53.

3 is a schematic configuration diagram of the switch switching unit of FIG. 2. As shown in FIG. 3, the mechanical configuration of the switch switching unit according to the present invention is slidably mounted with respect to the permanent magnet 51 and the permanent magnet 51 positioned on the contact line of the slide switch 60. End of the working rod 54 and the working rod 54 fixed to the end of the magnetic body 53, which becomes an electromagnet and is repulsed by the permanent magnet 51 when a current is applied to the coil wound on the end. The pressing member 55 of the rubber material and the magnetic member 53 mounted on the tension spring 52 for pulling the magnetic body 53 toward the permanent magnet 51 side.

Hereinafter, the operation of the automatic power shut-off device of the cash register of the present invention having the above-described configuration will be described in detail.

4 is a flowchart for explaining the operation of the automatic power off device of the cash register of the present invention. First, when the user turns on the power switch of the cash register implemented by the slide switch 60 or the like, in step S10, the internal timer Ti is cleared, and the output terminal P1 and P2 are low. Outputs a level signal. Next, in step S12, it is determined whether there is any key input based on the kisscan unit (not shown). If there is no key input in step S12, the flow advances to step S14 to increment the count of the timer Ti by one. Next, in step S16, it is determined whether the current count value of the timer Ti is equal to or greater than the first reference value T1 predetermined in correspondence to the power saving mode. In step S16, when the current count value of the timer Ti, that is, the time value in which the state without the key input continues, is less than the first reference value T1, step S12 or less is repeated again. If any key input is present in step S12 during this repetition, the flow advances to step S24 to clear the count value up to the point in time of the timer Ti, and at the same time, output terminals P1 and P2. Output a low level signal through.

If the current count value of the timer Ti reaches the first reference value T1 in step S16, the process proceeds to step S18 to output a high level signal through the output terminal P1. . As a result, as described above, the transistor Q1 is turned on, and as a result, the power supply through the first regulator 12 is cut off while the power supply through the second regulator 14 is continued in the power saving mode. Done. Therefore, the automatic power off program through the microprocessor 20 can be normally executed.

In this state, in step S20, it is determined whether the current count value of the timer Ti has reached the second reference value T2 which is a reference value for the power supply cutoff. If the current count value of the timer Ti is less than the second reference value T2 in step S20, step S12 or less is repeated. On the other hand, when the current count value of the timer Ti reaches the second reference value T2 in step S20, the process proceeds to step S22 to output a high level signal to the output terminal P2. do. When the high level signal is output, the transistor Q2 is turned on, and the magnetic body 53 instantly becomes an electromagnet. The operating rod 4 is advanced by the repulsive force generated between the electromagnet and the permanent magnet 51. The slide switch 60 is momentarily pushed. Accordingly, the power of the cash register is automatically cut off. When the power is cut off, the magnetic body 53 is demagnetized and the repulsive force is released. Then, the actuating rod 54 is retracted by the action of the tension spring 52 to supply power from the outside. It can be turned on again.

The configuration of the automatic power cut-off device of the cash register of the present invention is not limited to the above-described embodiments, and can be variously modified and implemented within the range permitted by the technical idea of the present invention. For example, it may be configured to immediately turn off the power without putting a power saving mode as in the above-described embodiment, and the type of switch may be implemented by a switch other than a slide switch, for example, a push switch.

According to the automatic power cut-off device of the cash register according to the present invention as described above, when there is no key input for a long time in the power-on state, there is an effect of maximizing the power saving capability by automatically turning off the power. .

Claims (3)

A power supply unit for generating a DC voltage by reducing, rectifying, and smoothing a commercial AC power supply; A power switch interposed between the commercial AC power supply and the power supply unit; A regulator for generating a DC voltage having various sizes after removing the ripple from the DC voltage generated by the power supply unit; A kisscan unit detecting whether a key is input; A switch switch to forcibly turn off the power switch; And It is determined whether or not a key is input based on the signal provided from the kisscan unit, and if a state in which there is no key input continues for a predetermined reference time T2, a control signal is input to the switch switching unit to turn off the power switch. Power cut-off device of the cash register comprising a control unit for outputting. 2. The regulator of claim 1, wherein the regulator comprises a first regulator for generating a relatively high direct current voltage and a second regulator for generating a relatively stable and low direct current voltage for a logic circuit, The control unit controls to cut off only the power of the first regulator when the time without the key input reaches a predetermined reference time T1 less than the reference time T2. Blocking device. The method according to claim 1 or 2, wherein the switch switching unit Slide switch; A permanent magnet located on a contact line of the slide switch; A magnetic body slidably mounted with respect to the permanent magnet and becoming an electromagnet when a current is applied to a coil wound around the permanent magnet and being repulsed by the permanent magnet; An operating rod fixed to an end of the magnetic material to turn off the slide switch when moving forward; And a tension spring that pulls the magnetic material toward the permanent magnet in the magnetic element element.