POS machine closing complete power-off circuit

Abstract

The utility model discloses a POS machine shutdown complete power-off circuit comprising resistors R1, R2, R3, R4 and R5, diodes A1 and A2, a switch K1, triodes Q1 and Q2 and a P-MOS tube Q3. When the K1 is pressed down, the VBAT enables the Q2 to be conducted through the R1, the K1, the A2 and the R3, and further enables the Q3 to be conducted to supply power to the VSYS; and meanwhile, the K1 enables the Q1 to be conducted, the POWERKEY is pulled down, and the system is triggered to be started. After the system is started, a 3.3 V power supply generated inside maintains conduction of the Q2 and the Q3 through the A1, so that continuous power supply is realized. When the POS machine is turned off, the internal 3.3 V power supply disappears, the Q2 is cut off, and the grid electrode of the Q3 is turned into a high level and is turned off, so that the VBAT and the VSYS are completely isolated, complete power failure of the system end is realized, continuous power consumption of the battery after the POS machine is turned off is avoided, and the service life of the battery is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to POS machine technical field especially relates to a POS machine shutdown complete power-off circuit. BACKGROUND

[0002] POS machine is the popular payment equipment currently. At present, after the POS machine is turned off, a part of circuit in the POS machine still consumes power continuously, leads to the battery power reduction, when the placing time is relatively long, will cause the battery excessive power consumption. INVENTION CONTENTS

[0003] In order to solve the above problem, the utility model discloses a kind of POS machine shutdown complete power-off circuit, when the POS machine is turned off, the power supply line of battery is completely disconnected, avoid battery excessive power consumption.

[0004] In order to realize the above technical purpose, the technical scheme that the utility model adopts is as follows: a kind of POS machine shutdown complete power-off circuit, including resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, diode A1, diode A2, switch K1, triode Q1, triode Q2 and P-MOS tube Q3;

[0005] VBAT is connected to one end of the resistance R1, and the other end of the resistance R1 is connected to switch K1, the other end of the switch K1 is connected to the anode of diode A2, one end of the resistance R2 is connected to the common terminal between switch K1 and the anode of diode A2, and the other end of the resistance R2 is connected to the base of triode Q1, the emitter of the triode Q1 is grounded, and the collector of the triode Q1 is connected to POWERKEY;

[0006] The anode of diode A1 is connected to the 3.3V power supply inside the POS machine, the cathode of diode A1 and diode A2 is commonly connected to the same end of resistance R3, the other end of the resistance R3 is connected to the base of triode Q2, the emitter of the triode Q2 is grounded, and the collector of the triode Q2 is connected to resistance R4, and the other end of the resistance R4 is connected to VBAT;

[0007] The drain of P-MOS tube Q3 is connected to VSYS, the source of P-MOS tube Q3 is connected to the common terminal between VBAT and resistance R4, the gate of P-MOS tube Q3 is connected to resistance R5, and the other end of the resistance R5 is connected to the common terminal between the collector of triode Q2 and resistance R4.

[0008] Further, the switch K1 is a light touch switch, and the hand is in the on state when pressed, and the hand is not in the on state when released, and cannot pass through large current.

[0009] Based on the above, the application also provides a POS machine, which comprises the above-mentioned POS machine shutdown complete power-off circuit.

[0010] With the technical scheme, the utility model discloses the circuit compared with prior art has the beneficial effect that:

[0011] The circuit can completely disconnect the battery power supply when the POS machine is powered off, avoid excessive power consumption of the battery, and make the battery have a longer service life.

[0012] In the utility model, the resistance R1 connects the voltage VBAT of the battery to the diode A2 and the resistance R3 to control the triode Q2 through the switch K1, when the switch K1 is pressed, the triode Q2 is turned on to make the P-MOS tube Q3 turned on to supply power for the POS system VSYS. At the same time, when the switch K1 is pressed, the triode Q1 is also turned on to make the original power-on signal POWERKEY of the POS machine low, so that the POS machine system is powered on, and after the POS machine system is powered on, the 3.3V power supply generated in the POS machine will maintain the triode Q2 and the P-MOS tube Q3 turned on through the diode A1, so that the battery can continuously supply power for the POS machine system, and therefore, after the press-and-hold switch K1 is released (turned off), the battery can continuously supply power for the POS machine system.

[0013] When the POS machine is powered off, the 3.3V power supply generated in the POS machine will become 0V, so that the triode Q2 is cut off, thereby making the G (gate) of the P-MOS tube Q3 become high level, and the P-MOS tube Q3 is not turned on, so as to realize that VBAT and VSYS are completely separated, and VSYS is completely powered off. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0015] Figure 1 It is the circuit connection schematic diagram of the utility model.

[0016] In the drawings, each reference numeral refers to: R1: resistance, R2: resistance, R3: resistance, R4: resistance, R5: resistance, K1: switch, A1: diode, A2: diode, Q1: triode, Q2: triode, Q3: P-MOS tube, VBAT: battery voltage, VSYS: POS system power supply, POWERKEY: POS system power-on signal (low effective). DETAILED DESCRIPTION

[0017] The utility model will be described in further detail below in connection with the drawings and embodiments. It is particularly pointed out that the following embodiments are only used for illustrating the utility model, but do not limit the scope of the utility model. Similarly, the following embodiments are only part of the embodiments of the utility model rather than all the embodiments, and all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of the utility model protection.

[0018] Referring to the drawings Figure 1 The embodiment provides a POS machine complete power-off circuit, including resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, diode A1, diode A2, switch K1, triode Q1, triode Q2 and P-MOS tube Q3.

[0019] In the embodiment, the switch K1 is a touch switch, and the hand is in the on state when being pressed down, and the hand is not in the on state when being released, and cannot pass through the large current;Triode Q1, triode Q2 are all NPN triodes.

[0020] One end of resistance R1 is connected to VBAT, and the other end is connected to switch K1, and the other end of switch K1 is connected to the anode of diode A2, one end of resistance R2 is connected to the common terminal between switch K1 and the anode of diode A2, the other end of resistance R2 is connected to the base of triode Q1, the emitter of triode Q1 is grounded, and the collector of triode Q1 is connected to POWERKEY (prior art);

[0021] The anode of diode A1 is connected to the internal 3.3V power supply of the POS machine, the cathodes of diode A1 and diode A2 are commonly connected to the same end of resistance R3, the other end of resistance R3 is connected to the base of triode Q2, the emitter of triode Q2 is grounded, the collector of triode Q2 is connected to resistance R4, and the other end of resistance R4 is connected to VBAT;

[0022] The drain of P-MOS tube Q3 is connected to VSYS, the source of P-MOS tube Q3 is connected to the common terminal between VBAT and resistance R4, the gate of P-MOS tube Q3 is connected to resistance R5, and the other end of resistance R5 is connected to the common terminal between the collector of triode Q2 and resistance R4.

[0023] In the embodiment, when the touch switch K1 is pressed down, the following two actions are triggered:

[0024] 1) VBAT passes through resistance R1, touch switch K1, diode A2 and resistance R3 to make triode Q2 conduct, and after triode Q2 conducts, the G pole of P-MOS tube Q3 is pulled low, so that P-MOS tube Q3 is turned on, and VSYS (system power supply) has power supply;

[0025] 2) VBAT through the light touch switch K1 let triode Q1 turn on, pull down POWERKEY signal, make the system start, the system starts and will produce 3.3V voltage (for prior art) maintain triode Q2 conduction, thereby maintain P-MOS tube Q3 conduction, so light touch switch K1 release (open) after, battery can continue to supply power to POS machine system, make the system normal work.

[0026] When the POS machine is powered off, the 3.3V power generated inside the POS machine will become 0V, so that the triode Q2 is cut off, thereby making the G (gate) of the P-MOS tube Q3 become high level, and the P-MOS tube Q3 is not conductive, thereby realizing that the VBAT is completely separated from the VSYS (that is, the VSYS is completely powered off), effectively preventing the POS machine from working after the POS machine is powered off, so that the battery continues to consume power.

[0027] In addition, the embodiment also provides a POS machine comprising the above POS machine complete power-off circuit.

[0028] The circuit provided by the utility model prevents the battery from continuing to consume power caused by the circuit on the POS machine board working, avoids excessive power consumption of the battery, makes the battery life longer, and realizes that the battery power supply is completely disconnected when the POS machine is powered off.

[0029] The above only describes some embodiments of the utility model, and does not limit the protection scope of the utility model, and equivalent devices or equivalent process transformations using the contents of the utility model specification and drawings, or direct or indirect application in other related technical fields are also included in the patent protection scope of the utility model.

Claims

1. A POS machine complete power-off circuit, characterized by, The POS machine complete power-off circuit comprises resistors R1, R2, R3, R4, R5, diodes A1, A2, a switch K1, transistors Q1, Q2 and a P-MOS tube Q3. One end of the resistor R1 is connected to VBAT, the other end is connected to the switch K1, the other end of the switch K1 is connected to the anode of the diode A2, one end of the resistor R2 is connected to the common terminal between the switch K1 and the anode of the diode A2, the other end of the resistor R2 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to POWERKEY. The anode of the diode A1 is connected to the 3.3V power supply inside the POS machine, the cathodes of the diodes A1 and A2 are commonly connected to the same end of the resistor R3, the other end of the resistor R3 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is connected to the resistor R4, and the other end of the resistor R4 is connected to VBAT. The drain of the P-MOS tube Q3 is connected to VSYS, the source of the P-MOS tube Q3 is connected to the common terminal between VBAT and the resistor R4, the gate of the P-MOS tube Q3 is connected to the resistor R5, and the other end of the resistor R5 is connected to the common terminal between the collector of the transistor Q2 and the resistor R4.

2. The POS machine complete power-off circuit according to claim 1, wherein, The switch K1 is a light touch switch.

3. A POS machine, characterized by, The POS machine complete power-off circuit comprises the POS machine complete power-off circuit according to claim 1 or 2. The POS machine complete power-off circuit comprises the POS machine complete power-off circuit according to claim 1 or 2.

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