KR19990008410U - Charging and External Power Control - Google Patents

Abstract

The present invention relates to a charging and external power control device that enables the battery to be charged within a short time by increasing the battery use efficiency and charging efficiency of the power supply device, as well as the device to perform a stable operation even in the event of power failure.

The present invention is a charging and external power control device is an external power supply means for generating an external power from the outside, the internal power supply means for generating an internal power is charged by the external power supplied from the external power supply means, and the external power source and And a system power supply means for generating system use power for selectively supplying internal power to drive the system, and a control means for selectively switching paths of external power and internal power.

By such a configuration, the charging and external power control device of the present invention enables charging in a short time by increasing the battery use efficiency and charging efficiency, and also the device can perform a stable operation even in the event of power failure.

Description

Charging and External Power Control

The present invention relates to a portable device, and in particular, by increasing the battery use efficiency and charging efficiency of the power supply device to enable the battery to be charged in a short time, and to ensure that the device performs a stable operation even in the event of power failure of the external power supply It relates to a control device.

In general, a portable device (for example, a camcorder, a mobile phone, etc.) is supplied with a battery or an external power source for supplying power for performing these operations. To this end, the portable device is equipped with a charging and external power control device.

This conventional charging and external power control device will be described with reference to FIGS. 1 and 2.

Referring to FIG. 1, a conventional charging and external power control device is charged with an external charging and power supply device 2 for supplying external power from the outside and an external power supply from the external charging and power supply device 2. DC-DC power supply (hereinafter referred to as DC / DC power supply) for direct current / DC conversion of the battery 4 and an external power supply or power supplied from the battery 4 to generate a system voltage to operate the system. It is provided.

The battery 4 has five 1 to 5 terminals, and the 1 and 2 terminals are connected to the input terminal of the DC / DC power supply 6. Terminals 3, 4 and 5 are connected to the output terminals of the external charging and power supply 2. Terminals 1 and 3 of the battery (4). Terminals 2 and 5 are internally connected respectively. Terminal 4 is the temperature sensor output (TEMP) inside the battery (4), which is used for controlling the temperature by charging. The external voltage terminal VEXT of the external charging and power supply device 2 is connected to the third terminal of the battery 4 to supply operating power of the device. The ground terminal PWR_GND of the external charging and power supply 2 is connected to terminal 5 of the battery 4.

In the structure of the conventional charging and external power control device, the charging and power supply can be performed simultaneously by the external charging and power supply device (2). However, such a conventional charging and external power control device is charged while using the battery 4 during the use of the device causes a disadvantage that the efficiency is significantly reduced in charging the battery 4 according to the use state of the device.

2 is a circuit diagram of another conventional charging and external power supply control device.

Referring to FIG. 2, another conventional charging and external power control device is charged with an external charging and power supply device 12 for supplying external power from the outside and an external power supply from the external charging and power supply device 12. DC / DC power supply unit 16 for generating a system use power source for operating the system by direct current-DC conversion of the battery 14, the external power source supplied to the battery or the battery 14, and the external power source. First to third diodes D1 to D3 for selectively switching the paths of the transistors are provided.

The first diode D1 is supplied with the external voltage VEXT from the external charging and power supply 12, and is supplied to the DC / DC power supply 16 and the third diode D3 via the first node 21. Commonly connected. The second diode D2 is supplied with the charging voltage VCHRG of the external charging and power supply 12, and is connected to the first terminal of the battery 14 and the third diode D3 via the second node 22. Commonly connected. The ground terminal PWR_GND of the battery 14 is commonly connected to the ground terminal PWR_GND and the ground voltage source GND of the external power supply device 14 via the third node 23. Terminal 2 of the battery 14 is a temperature sensor output (TEMP) inside the battery 14, which is used for the purpose of controlling the temperature during charging.

The external voltage VEXT of the external charging and power supply 12 is supplied as the system voltage VSYS to the DC / DC power supply 16 via the first diode D1 so that the DC / DC power supply 16 is supplied. By converting this into DC / DC, it is necessary to generate a power source for operating the system of the apparatus. The external charging and power supply 12 supplies the charging voltage VCHRG as the charging voltage VBAT of the battery 14 via the second diode D2, so that the battery 14 is charged at this voltage.

The external voltage VEXT is set higher than the charging voltage VCHRG. This causes the voltage on the first node 21 to be higher than the voltage on the second node 22 when charging the battery 14 so that the battery voltage VBAT is the system voltage VSYS of the DC / DC power supply 16. This is to prevent the supply as a.

However, the conventional charging and external power control device according to such a configuration is supplied to the DC / DC power supply device 16 via the third diode D3 when the system voltage VSYS is supplied using only the battery 14. Since the voltage drop through the third diode D3 is always present because the system voltage VSYS is supplied, the use efficiency of the battery 14 is lowered, which in turn limits the use time of the device.

Accordingly, an object of the present invention is to provide a charging and external power control device to enable the charging in a short time as well as to enable the device to perform a stable operation even in the power supply of the external power.

1 is a circuit diagram showing a conventional charging and external power control device.

2 is a circuit diagram showing another conventional charging and external power control device.

3 is a circuit diagram showing a charging and external power control device according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

2, 12, 32: External charging and power supply 4, 14, 34: Battery

2, 16, 36: DC / DC power supply device 40: control unit

42: Connector D1, D2, D3, Q1D: Diode

R1, R2: resistors Q1, Q2: transistors

In order to achieve the above object, the charging and external power control device of the present invention is an internal power supply that is charged by the external power supply means for generating external power from the outside, and the external power supplied from the external power supply means to generate internal power And a supply means, a system power supply means for generating system use power for selectively supplying external power and internal power to drive the system, and a control means for selectively switching paths of external power and internal power.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, with reference to Figure 3 will be described a preferred embodiment of the present invention.

3 is a view showing a charging and external power control device according to an embodiment of the present invention, the charging and external power control device of the present invention in the configuration of Figure 3 is an external charging and power supply device 32 for supplying power from the outside (32) ), The battery 34 charged by the external charging and the external power supply by the power supply device 32, the DC / DC power supply 36 for DC-DC conversion to operate the system, the battery 34 or external And a control unit 40 for selectively controlling the system voltage VSYS of the DC / DC power supply 36 or the battery voltage VBAT of the battery 34 according to the state of the charging and power supply 32. .

The external charging and power supply device 32 is connected to the control unit 40 to supply external power to the battery 34 and the DC / DC power supply unit 36. For this purpose, the control unit 40 includes a connector 42. do.

In addition, the controller 40 may include a first diode D1 to which an external voltage VEXT of the external charging and power supply device 32 is supplied via the first node 24 and a first node 24 through the first node 24. It is connected to the first diode D1 via the second transistor Q2 to which its base terminal is connected to the first diode D1, and the first node 24 and the gate current limiting resistor R1. A first transistor Q1 is provided. The common voltage Vcc is supplied to the collector terminal of the second transistor Q2 via a pull-up resistor R2, and the voltage on the collector is the microprocessor's external power supply voltage VEXT_SENSE. Supplied to the processor.

The battery 34 includes + terminal,-terminal, and temperature sensor output terminal (Temp) on the inside and outside of the system. The DC / DC power supply 36 receives the system voltage VSYS from the battery 34 or the external charging and power supply 32 to generate a system use voltage by converting the DC / DC.

The external charging and power supply device 32 is connected to the connector 42 to supply the external voltage VEXT and the charging voltage VCHRG to the battery 34 and the DC / DC power supply 36.

Battery 34 is composed of + terminal (terminal 4 and terminal 1),-terminal (terminal 6 and terminal 3) and temperature sensor output terminal (TEMP) on the inside and the outside of the system, Figure 1 Similar to the charging and external power control device according to the prior art shown in the above to enable the design of a simple external charging and power supply (32). The temperature sensor output terminal TEMP is the temperature sensor output inside the battery 34 and is used for the purpose of controlling the temperature during charging.

The external charging and power supply 32 is connected to the control unit 40 through the connector 42 to supply the system voltage VSYS to the DC / DC power supply 36 via the first diode D1 and to connect the connector. The charging voltage VCHRG is supplied to the battery 34 so that the battery 34 is charged via the 42.

In the state where the external charging and power supply device 32 is not connected to the control unit 40 through the connector 42, the terminals 2 and 3 of the connector 42 are connected to the battery voltage VBAT of the battery 34. ) Is supplied to the DC / DC power supply 36 as the system voltage VSYS to drive the DC / DC power supply 36. At this time, the gate terminal of the first transistor Q1 is supplied with a gate threshold voltage or less to be turned on so that the second node passes through the internal diode Q1D of the first transistor Q1. Terminal 25 and the terminal 1 of the battery 34 are connected. The first diode D1 serves to prevent a reverse current to the external voltage VEXT. On the other hand, a voltage below the turn-on voltage is applied to the base terminal of the second transistor Q2 so that the first node 24 is connected to the base voltage source GND. The common voltage Vcc is applied to the external voltage sense voltage VEXT_SENSE of the microprocessor via the pull-up resistor R2 so that the external voltage sense voltage VEXT_SENSE has a high logic value. do. With the external voltage sense voltage VEXT_SENSE having a logic value of high, the microprocessor determines that the system is driven by the battery 34.

To this end, the first transistor Q1 uses an N-channel field effect transistor (FET), and the second transistor Q2 uses an NPN type bipolar transistor (BJT).

When the external charging and power supply device 32 is connected to the control unit 40 through the connector 42, the charging voltage VCHRG of the external charging and power supply device 32 is changed by the connector 42 by the switching structure of the connector 42. The terminal 34 of the battery 34 is supplied as the battery voltage VBAT via the terminal 3 of the battery 34, and the battery 34 is charged. At this time, when the external voltage VEXT is supplied, the external voltage VEXT is supplied to the base Base of the first transistor Q1 via the gate current limiting resistor R1, and the first transistor Q1 is turned off. do. Accordingly, in the source and drain, the current path is switched, that is, the first terminal of the second node 25 and the battery 34 is switched so that the external voltage VEXT is the first diode D1. Is supplied to the DC / DC power supply 36 as a system voltage. In addition, the external voltage VEXT is supplied to the base of the second transistor Q2 via the first node 24, and the second transistor Q2 is turned on. Then, the collector saturation current is applied between the collector and the emitter of the second transistor Q2, so that the collector and the emitter are electrically connected. The common voltage Vcc is then bypassed to the base voltage source GND via the pull-up resistor R2. Therefore, the external voltage sensing voltage VEXT_SENSE applied to the microprocessor becomes a logic value of low. An external voltage sense voltage VEXT_SENSE having a logic value of low tells the microprocessor that the system is driven by an external charging and power supply 32.

When the external charging and power supply device 32 is connected to the control unit 40 through the connector 42, but the external voltage VEXT and the charging voltage VCHRG are not supplied, the external charging and power supply device 32 is switched by the connector 42. Terminals 2 and 3 of the connector 42 are switched so that the battery voltage VBAT of the battery 34 is not supplied to the DC / DC power supply 36 as the system voltage VSYS. At this time, the source and the drain of the first transistor Q1 are connected so that the battery voltage VBAT of the battery 34 is supplied with the system voltage VSYS to the DC / DC power supply 36. This makes it operate stably.

As described above, the charging and external power control device of the present invention can be charged within a short time by increasing the battery use efficiency and charging efficiency, and the device can perform a stable operation even in the event of power failure.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be determined by the scope of the utility model registration request.

Claims (9)

In a portable device, External power supply means for generating external power from the outside, Internal power supply means which is charged by the external power supplied from the external power supply means to generate internal power; System power supply means for generating a system use power for selectively supplying the external power and the internal power to drive the system; And control means for selectively switching the paths of the external power and the internal power. The method of claim 1, And the control means generates and supplies a specific logic value to the microprocessor so that the microprocessor controlling the system can determine the power supplied to the system power supply. The method of claim 1, Charging and external power supply control device, characterized in that the internal power supply means is charged by the external power as the external power supply means is connected to the control means and the external power is supplied to the system power supply means. The method of claim 1, Charging and external power control device, characterized in that the internal power supply from the internal power supply means is supplied to the system power supply means as the external power supply means is separated from the control means. The method of claim 1, Charging and external power supply control device characterized in that the external power supply means can be connected to the control means via a connector having at least one input terminal. The method of claim 1, Charging and external power supply control device characterized in that the internal power is supplied to the system power supply means as the external power supply means is connected to the control means and the external power is disconnected. The method of claim 1, The control means may be selectively driven as the external power is supplied to allow the internal power to be selectively supplied to the system power supply means; And a second control means connected to the first control means and selectively driven according to the external power to control the system to determine the power supplied to the system power supply means. And external power control device. The method of claim 7, wherein The first control means includes a gate to which the external power is supplied; A source connected to the system power supply means; And an N-channel field effect transistor having a drain connected to the internal power supply means to selectively switch the current paths of the external power and the internal power as the external power is supplied to the gate. External power control device. The method of claim 7, wherein The second control means may include a gate to which the external power is supplied; A collector supplied with a common voltage and connected to the microprocessor; And an NPN type bipolar transistor having an emitter connected to a base voltage source to selectively switch the current path of the common voltage as the external power is supplied to the gate.