KR200304126Y1 - multiple hand-phone charger - Google Patents

Abstract

PURPOSE: The present invention provides a multi-type mobile phone charging device which is configured to charge the cell phone battery by automatically discriminating the charging voltage of the battery and the polarity of the terminal.

Composition: In the conventional mobile phone charging device, the battery is applied to the polarity detector 14 for outputting the detection signal of the current direction of the battery mounted to the battery holder 20, and the charge voltage applied from the switching unit 6 is applied to the battery Polarity switching unit 16 for switching and outputting the polarity of the output terminal to match the polarity of the polarity, and if the current direction detection signal of the polarity detection unit 14 corresponds to the reverse arrangement of the battery terminal, the polarity switching to the polarity switching unit 16 When the polarity detection unit 14 inputs a signal related to the arrangement of the terminals to the MCU 10 in the current direction of the battery, which is configured as the MCU 10 for outputting a command signal, the MCU 10 Is configured such that the charging voltage output from the switching unit 6 is supplied and charged according to the terminal polarity of the battery by operating the polarity switching unit 16 when the terminal is reversely arranged.

Description

Multiple hand-phone charger

The present invention relates to a battery charging device of a mobile phone, and more particularly, to a multi-type mobile phone charging device that can be charged by a single device, regardless of the difference in battery specifications for each model and the arrangement of the terminal polarity will be.

The cell phone is powered by a lithium battery that can be recharged and has a relatively high charging capacity. In addition, since the usage time of the battery once charged depends on the operating voltage of the mobile phone, the battery voltage of the 7V band has recently been lowered to 3V recently, thereby prolonging the usage time.

However, cell phone batteries that have been put into practice are manufactured by different standards according to the product model, as well as by the manufacturer, and even if they are manufactured by different manufacturers, there is a problem that it is impossible to recharge the battery unless a dedicated charger is used.

For this reason, the user is restricted from having to recharge the mobile phone only in the place where the charger is provided.

On the other hand, recently, mobile phone charging places have been provided in various places in the downtown area to allow mobile phone users to recharge the battery. However, in this case, differences in the specifications of the battery, terminal location, arrangement, etc. are a major obstacle to practical use. It is becoming.

A charger capable of recharging a cell phone battery of various standards by solving a problem described above is disclosed in a multi-type cell phone charging device of Korean Utility Model Publication, Registration No. 20-0256166.

The charging device is arranged to be in contact with the terminal of the battery is divided into a plurality of terminals so that the battery terminal can be in contact with one of them, and the polarity of the terminal for charging is connected to the charging terminal in parallel with the diode and the resistor This allows the current to flow selectively depending on the polarity of the battery.

However, in the above charging device, the structure of dividing and arranging a plurality of charging terminals in contact with the battery terminals is difficult to be considered as a reliable method because the number of parts is increased more than necessary and a lot of manpower is required in assembling work and the like.

The reason for this is that the charging terminals of the battery are arranged in two pairs or three contacts, so that one side is configured as a charging terminal, and the other side is configured as a terminal for outputting a signal for indicating the state of charge to the outside. In this case, an external current is applied to a terminal for outputting a signal in a charged state, thereby damaging the internal circuit of the battery, or charging is not performed unexpectedly.

After the detection of the terminal polarity, since two transistors are used as switching elements, one transistor is turned on according to the polarity so that a charging current is applied. In addition, the circuit configuration has a problem that is extremely complicated and requires a large number of elements, making it practically difficult to use.

An object of the present invention is to provide a multi-type mobile phone charging device that can be charged by a single charging device regardless of the standard of the battery for the cell phone and the arrangement of the terminal polarity even with a simple circuit configuration.

Another object of the present invention is to detect the terminal polarity of the mobile phone battery with a pair of charging terminals so that it can be used particularly for unattended vending type mobile phone chargers that operate on a paid charging type. It is to provide a multi-type mobile phone charging device with a configuration that can change the polarity.

To this end, the present invention is a conventional mobile phone charging device, the polarity detector for outputting a detection signal of the current direction of the battery mounted to the battery holder, and the output terminal to receive the charging voltage applied from the switching unit to match the polarity of the battery If the polarity switching unit for switching and outputting the polarity of and the current direction detection signal of the polarity detection unit corresponds to the reverse arrangement of the battery terminal, the polarity switching unit outputs a polarity switching command signal to the polarity switching unit and always matches the terminal polarity of the battery so that the charging voltage is increased. The configuration includes the MCU to be authorized.

Here, the polarity detector may be formed of a pair of photo couplers operated in correspondence with the terminal polarity of the battery.

The polarity switching unit includes a pair of two pairs of contacts connected in parallel to an output terminal of the switching unit, and a pair of movable contacts interposed between both contacts, and the two movable contacts are energized by an operation signal of the MCU. The pair of two pairs of contacts are linked to each other by two solenoids to selectively open and close the two movable contacts, respectively, so that the polarity of the output terminal side of the polarity switching unit is switched.

In addition, the MCU may be programmed to recognize whether the battery is mounted and whether the battery is fully charged with the battery current value input through the current detector.

1 is a block diagram showing a circuit configuration of a charging device to which the present invention is applied.

Figure 2 is a circuit diagram showing a wiring structure related to the main part of the present invention.

3 is a flowchart showing an example of a control flow applicable to the device of the present invention.

<Brief description of symbols for the main parts of the drawings>

6: switching unit 10: MCU

14: polarity detection unit 16: polarity switching unit

20: battery holder 22: current detector

The above-described device of the present invention will be described in detail as a preferred embodiment according to the accompanying drawings.

1 is a circuit diagram showing an example in which the present invention is applied to an unmanned vending charger, in the figure 2 is a rectifier consisting of a transformer and a bridge-connected diode, and 4 is charged by passing the rectified voltage through a secondary transformer. Switched mode power supply (SMPS) matching unit for stepping down to the voltage required for the operation of the circuit components.

The secondary output signal from the matching section 4 is applied to the switching section 6, while a signal for control is also output to the PWM rectifying section 8, and the control signal is transmitted from the MCU 10 to the reference voltage section ( The output voltage of the matching section 4 is constantly maintained at a constant voltage by being processed to a value compared with the signal input through 12) and being fed back to the primary side of the matching section 4.

The switching unit 6 is configured to turn on when a signal is input from the MCU 10 and output a charging voltage to an output terminal thereof. The charging voltage sent to the output terminal charges the mounted battery by being applied to the battery holder 20 via the polarity detecting unit 14, the polarity switching unit 16, and the main switching unit 18 thereafter. At this time, a part of the charging current is input to the MCU 10 with the current value at the time of charging through the current detector 22 to monitor the charging state of the battery.

On the other hand, the polarity detector 14 is to determine the polarity of the battery mounted on the battery holder 20, and input the determination signal to the MCU (10), based on the determination signal, the MCU (10) By interlocking / de-interlocking the polarity switching unit 16, the polarity of the current applied to the battery holder 20 is made to match the terminal polarity of the mounted battery.

The MCU 10 outputs an operation signal of the monitor driver 24 to externally display the state of charge of the battery, and the monitor driver 24 according to the output signal of the MCU 10 according to the liquid crystal display device. The monitor 26 such as a fluorescent display tube is driven to display the current state of charge to the outside. In addition, the MCU 10 is configured such that an output signal from the collecting means 28 for checking whether the charging cost is paid is input via the interface 30.

Meanwhile, the reset unit 32 receives a pulse periodically from the MCU 10. When the input pulse is interrupted from the MCU 10, the reset unit 32 recognizes that the program is stopped and outputs a reset signal. .

FIG. 2 is a diagram showing a main part circuit configuration of the charging device according to the present invention, wherein the main switching unit 18 has a relay having a pair of movable contacts M1 and M2 interlocked by an excitation of the first solenoid S1. It is composed of.

The main switching unit 18 is a normally closed switch in which both movable contacts M1 and M2 are connected to the open contacts a1 and a2 to maintain the switching-off phase when the power is not in operation. This prevents the reverse voltage discharge of the battery voltage when the power is cut off.

In addition, when the power is turned on, the first solenoid S1 is energized and the two movable contacts M1 and M2 are connected to the closed contacts b1 and b2, respectively, thereby switching to a state where charging can proceed.

On the other hand, the switching unit 6 is turned on by the bias signal sent when the MCU 10 detects that the power is turned on is to output the charging voltage.

The polarity detector 14 includes a pair of photo couplers Ph1 and Ph2 operated by the output signal of the switching unit 6, and each of the pair of photo couplers Ph1 and Ph2 has a respective output terminal. It is connected to the one-side contact a10, a20 provided in the rear-side polarity switching section 16, and the input end side of both photo couplers Ph1 and Ph2 is connected to the other contact point b10, of the polarity switching section 16, respectively. b20), and the movable contacts M10 and M20, which are interlocked by the second solenoid S2, are positioned between the one contact a10 and a20 and the other contact b10 and b20. .

Such a circuit configuration of the polarity detecting section 14 and the polarity switching section 16 produces the following functions.

When the main switching unit 18 is switched on, the movable contacts M1 and M2 are connected to the closed contacts b1 and b2, and the movable contacts M10 and M20 of the polarity switching unit 16 have one side contact ( It is connected with a10 and a20. At this time, when the battery is mounted to the battery holder 20 and the polarity of the battery is the forward direction, the current direction flows to one side contact a10 so that the first photo coupler Ph1 operates, and the output signal thereof is the MCU 10. By inputting into the MCU 10 recognizes that the battery polarity is in the forward direction and maintains the current contact state of the polarity switching unit 16 as it is.

However, when the polarity of the battery is in the reverse direction, since the current flows to the one-side contact a20 at the polarity switching unit 16, the second photo coupler Ph2 operates to input the output signal to the MCU 10 so that the polarity of the battery is increased. Enter reverse. At this time, the MCU 10 operates the second solenoid S2 to switch the movable contacts M10 and M20 of the polarity switching unit 16 to be connected to the other contacts b10 and b20. will be.

At the same time as the polarity switching action, the current detector 22 inputs a current value remaining in the battery 20 to the MCU 10 to input a signal related to charging or not.

In more detail, the above operation is described in detail. If both terminals of the battery holder 20 are, for example, the upper side of the drawing as the X terminal and the lower side as the Y terminal, when the X terminal is +, the voltage of the battery is the main switching. Movable contact M1 of the part 18 → closed contact b1 → movable contact M10 of the polarity switching section 16 → one side contact a10 → input terminal I1 of the first photo coupler Ph1 → polarity One side contact (a20) of the switching unit 16 → movable contact (M20) → closed contact (b2) of the main switching unit 18 → movable contact (M2) → MCU (10) → Y terminal of the battery holder 20 Since it flows through the circuit leading to, the output signal of the first photo coupler (Ph1) is input to the MCU (10) to input the signal of the battery terminal positive array.

On the contrary, when the Y terminal side of the battery 20 is-, the MCU 10 → the movable contact M2 of the main switching unit 18 → the closed contact b2 → the one-side contact a20 of the polarity switching unit 16 → Input terminal I2 of the second photo coupler Ph2 → one side contact a10 of the polarity switching unit 16 → movable contact M10 → closed contact b1 of the main switching unit 18 → movable contact M1 ¡Æ the output signal of the second photo coupler Ph2 is input as a signal of the reverse polarity of the battery to the MCU 10 through the circuit leading to the X terminal of the battery holder 20.

As such, the output signal of the first photo coupler Ph1 or the second photo coupler Ph2 is input to the MCU 10 according to the polarity of the battery mounted with the battery holder 20, and the remaining current value of the battery is equal to the current. It is input through the detector 22. As a more specific example, when the output signal of the second photo coupler Ph2 is programmed to operate the second solenoid S2 when the output signal of the second photo coupler Ph2 is input to the MCU 10, both of the polarity switching units 16 are operated. The contacts M10 and M20 are connected by the second solenoid S2 and connected to the other contacts b10 and b20 to cause the circuits to be connected in the opposite direction.

As a result of this operation, when the signal of the first photo coupler Ph1 is output, the second solenoid S2 is in an inoperative state, and thus the charging voltage output from the switching unit 6 is one side of the polarity switching unit 16. When charging is performed while the terminal A10 and the closed terminal b1 of the main switching unit 18 are applied to the X terminal of the battery holder 20, and the signal of the second photo coupler Ph2 is inputted, Since the second solenoid S2 is operated so that the two movable contacts M10 and M20 are interlocked, the charging voltage output from the switching unit 6 is the other side contact b20 of the polarity switching unit 16 and the main switching unit. The charging is performed while being applied to the Y terminal of the battery holder 20 via the close contact b2 and the MCU 10 of (18).

On the other hand, the voltage thus charged is input to the current detector 22 and the current value thereof is measured. The current detector 22 detects a change in the current value due to the resistance generated by the battery charging and inputs it to the MCU 10, and the MCU 10 inputs a signal of the current detector 22 to the battery. When charging is indicative of full charge, the output signal biased to the switching unit 6 is interrupted to terminate the charging.

3 is a flowchart for explaining a control flow that may be performed by the MCU 10 when the charging device of the present invention is applied to the charging device of the unmanned vending system shown in FIG. 1.

In the unattended vending device illustrated in FIG. 3, a case in which the voltage of the cellular phone battery is assumed to be 4.2V is described as an example.

When the power is turned on, the main switching unit 18 is switched on, and program operation of the MCU 10 is started.

The MCU 10 operates the monitor driver 24 to output the current state to the monitor 26. The monitor 26 may display the progress status of the charging / non-charging, the charging amount, the charging impossible, and the like under the control of the MCU 10.

When the amount payment signal is output from the collecting means 28, the MCU 10 displays the charge preparation through the monitor 26. Next, when the user mounts the battery into the battery holder 20, the MCU 10 triggers the switching unit 6 according to a signal input from the first photo coupler Ph1 to be turned on, or the first port. The coupler Ph1 is a no-signal, and when a signal is input from the second photo coupler Ph2, the second solenoid S2 is operated to switch the circuit connection of the polarity switching unit 16 and at the same time, the switching unit 6 ) To turn on. As a result, the charging voltage of the switching unit 6 is applied to the battery mounted in the battery holder 20 to perform charging, and at the same time, the current detector 22 measures the value of the charging current and inputs it to the MCU 10. do.

When the MCU 10 applies the charging voltage through the switching unit 6 to 4.2 V, the MCU 10 determines that the battery is mounted when the current measurement value through the current detector 22 is 50 mA or more, and performs subsequent charge control. If the current value is less than 50mA, it is determined that only a charged battery is installed and the battery is not displayed. In other error processing, when the battery output is over discharged and the output of the battery becomes 0V due to the operation of the internal protection circuit, both photo couplers (Ph1, Ph2) cannot operate, the inside of the battery is shorted or the charging terminal of the charging cradle is shorted. If overcurrent flows more than 900mA at 4.2V, the battery starts to charge and is only charged within 40 seconds. If the battery's check voltage is less than 2.5V before charging, it is determined that the battery is out of the charging standard. (26) indicates that the device can not be charged, and returns the collected amount, and when the user collects the battery, the device is switched to the standby state for charging.

In addition, when it meets the charging criteria, charging is performed and the charging progress rate is displayed on the monitor 26 in the remaining time such as 15 minutes and 30 minutes to inform the user of the battery recovery time. For the charging time period, the current value input to the MCU 10 through the current detector 22 is checked. For example, 3 minutes when the charging current value is 800 mA, 7 minutes at 700 mA, 10 minutes at 600 mA, 15 minutes at 500 mA. It can be set to 18 minutes at 400mA, 21 minutes at 300mA, or 25 minutes at 150mA.

In addition, the allowable charging time of the battery may be limited to about 120 minutes so that the user's battery may not be affected.

The MCU 10 reads the change in the current value input through the current detector 22 and checks the state of full charge. When the full state is charged, the MCU 10 displays a charge completion indication on the monitor 26 and when the user recovers the battery. Enter the standby state until.

In the standby state, the MCU 10 displays the full charge on the monitor 26 when the voltage of the charged battery drops below 3.8V and repeats the process of recharging when the current charged in the battery falls below 150mA. When the battery is recovered, the device is reset to finish the one-time charge control.

As described above, according to the present invention, one photo coupler among two photo couplers inputs a signal to the MCU to check the polarity of the battery according to the flow direction of the current remaining in the battery when charging the mobile phone battery. Is a simple configuration that switches the polarity of the terminal when the second solenoid is energized when the polarity of the terminal is required to be changed. Equipped with an effect that can charge.

Therefore, the present invention is a device that can be suitably used as a personal charging device, in particular, a cell phone charging device of the unmanned vending method.

Claims (1)

In the conventional mobile phone charging device, the polarity detection unit 14 for outputting a detection signal of the current direction of the battery mounted to the battery holder 20 and the polarity of the battery by receiving a charging voltage applied from the switching unit 6 A polarity switching command signal for switching the polarity of the output terminal to output the polarity switching unit 16 and a polarity switching command signal to the polarity switching unit 16 when the current direction detection signal of the polarity detecting unit 14 corresponds to an inverse arrangement of the battery terminal. Multi-type mobile phone charging device that is configured to include a MCU (10) to output.