KR100260894B1 - High speed charging and charging control circuit - Google Patents

Abstract

PURPOSE: A high speed charging and charging control circuit is provided to enable the high speed charging even during operation and of maximizing the efficiency of a battery and preventing the error operation even in switching operation by excluding a shielding device between the battery and a main body circuit. CONSTITUTION: An RF modem(10) consists of a high speed charging circuit(11), a battery(12) and a main body circuit(13). The battery(12) is a Ni-Ca based batter, a Ni-H based battery or a Li ion based battery. A modem pack is attached to the main body circuit(13). An external ultra compacted power supply(14) is connected to the high speed charging circuit(11), whereby A DC voltage through the high speed charging circuit(11) is supplied to the main body circuit(13) through the battery(12).

Description

Intermittent detection type fast charging and charging control circuit

The present invention relates to an intermittent detection high-speed charging and charging control circuit of an external wireless modem using a rechargeable battery, such as a notebook computer, which is a portable electronic device. Interruption detection fast charging and charging control circuit that can increase the reliability of the device because no malfunction is generated even when switching between the external power supply device and the rechargeable battery while maximizing the efficiency of the rechargeable battery because no blocking device between main circuits is required. It is about.

The conventional rechargeable battery detachment method used in portable telephones does not have a built-in device for charging, so in order to charge the battery, it is necessary to remove the rechargeable battery or the rechargeable battery pack and attach it to a separate high-speed charger so that it can be charged and used again. It is. By the way, the rechargeable battery detachment method has the advantage of being able to use a fast charging method that can lighten the weight of the phone main body and fully charge the rechargeable battery within 1 to 2 hours, but the portable phone can be operated during fast charging. There is no need to carry a separate rechargeable battery so that you can continue to use the phone during the charging time.

In addition, such a rechargeable battery can be prepared in case of emergency by always carrying a fast charger which is not small in size. Therefore, it has a tendency to increase the burden on the user who carries the portable phone, and always pays attention to the replacement time of the rechargeable battery. There was a flaw in the use of it.

Meanwhile, a method of using an external charger while a rechargeable battery is mounted on the main body is a method used in most portable phones and cordless telephones for home use, and the weight of the main body can be used while the main body is light while being charged. This method has the advantage that the built-in rechargeable battery is not completely discharged when connected to an external charger, so that the user does not have to worry about recharging, while charging is possible only in the presence of the charger. Since the phone is operating independently, the amount of current flowing into the rechargeable battery is changed irregularly, and there is no way to realize the all current characteristic required for the fast charging circuit.

Therefore, the charging method with the rechargeable battery mounted on the main body is stable to external noise due to the characteristics of the rechargeable battery, and the capacitive characteristics of the rechargeable battery are almost infinite so that the instantaneous maximum power demand of the main body can be easily operated. It has the advantage, but it has the disadvantage of using a standard charging method that takes practically 10 hours or more or a microcurrent charging method requiring more than 30 hours.

The charging circuit of the charging method described above is built in the apparatus main body as shown in FIG. 1, which is an example of the main circuit of the computer circuit in the portable computer 1, which is a notebook computer. Wood (3), rechargeable battery (4) and charge control circuit (5) is installed to supply DC power to main board (3) and charge control circuit (5) through external power supply (2), respectively. .

When the portable computer 1 receives power from a simple power supply device 2 capable of maintaining a constant voltage from the outside, the portable computer 1 also charges the rechargeable battery 4 using the charge control circuit 5 inside the main body. Also supplies the power used in the main board (3).

In order to adopt this method, the rechargeable battery 4 is configured to perform relatively stable high-speed charging while simultaneously performing the operation of the portable computer 1 without difficulty, which is about 2 hours. A lot of electronic products that can be fully charged are coming out.

However, in this method, since the external power supply 2 used must supply the power used by the main board 3 simultaneously with the charging of the rechargeable battery 4, the supply capacity of the external power supply 2 is very high. Had to be big.

Therefore, when the power used in the main board 3 of the portable computer 1 is severely changed, the external power supply 2 has to cope with the instantaneous maximum power consumption of the main board 3 without difficulty. It had to be bulkier.

In order to use such a charging method, an external power supply device 2 having a volume of 5 times or more is required under the same conditions as compared to the method of using an external charger while the above-described rechargeable battery is mounted on the main body. The problem is even worse when attempting to use portable radios.

In addition, most portable radios are very vulnerable to external noise, which makes it impossible to use relatively small and light switching power supplies. When using a charging circuit of the type used in a notebook computer, the power supply device is about 10 times the power capacity than the method using an external charger while the rechargeable battery is mounted on the main body to achieve normal operation.

In addition, since the charging control circuit 5 should never be connected to the main board 3 during the charging operation of the rechargeable battery 4, a PNP transistor or a P-type field effect transistor is used in the form of a switch. The cost for the parts is wasted, and the impedance of these parts causes the rechargeable battery 4 to be operated as if the impedance of the battery itself is large, thereby reducing the power efficiency.

The present invention has been described taking advantage of the advantages and disadvantages of the conventional charging method as described above, it is possible to fast charge the rechargeable battery within 1 hour to 2 hours through a fast charging circuit, it is possible to use a switching type charging circuit in wireless devices, etc. Since it is possible to install the fast charging circuit in the main body, there is no need for a separate external charger, and there is no need of a blocking device between the rechargeable battery and the main circuit, thereby maximizing the efficiency of the rechargeable battery and malfunctioning during the switching operation between the external power supply device and the rechargeable battery. The purpose of the present invention is to provide an intermittent detection type fast charge and charge control circuit that can increase the reliability of the device is not generated.

In addition, in another object of the present invention, not only can be used in the external power supply switching type but also the maximum capacity of the external power supply is determined according to the average power consumption of the main body circuit capacity according to the instantaneous maximum power consumption of the main body Compared with the conventional similar method of determining the size of the external power supply can be provided to reduce the size of up to 1/5 within the intermittent detection fast charging and charging control circuit that can be usefully used.

1 is a block diagram showing a conventional charging circuit.

2 is a block diagram showing an intermittent detection type fast charging and charging control circuit according to an embodiment of the present invention.

3 is a detailed circuit diagram showing an intermittent detection type fast charging and charging control circuit of the present invention.

* Explanation of symbols for main parts of the drawings

10: external wireless modem 11: fast charging circuit

12: rechargeable battery 13: body circuit

14: ultra small power supply

Intermittent detection-type fast charging and charging control circuit of the present invention for achieving the above object, the external wireless modem 10 intermittent detection-type fast charging circuit 11, nickel-cadmium-based, nickel-hydrogen-based and lithium-ion-based It consists of a main body circuit 13, the rechargeable battery 12 and the modem pack is attached, the external ultra-small power supply device 14 is connected to the fast charging circuit 11, the DC power supply through the fast charging circuit 11 It is characterized in that it is supplied to the main body circuit 13 through the rechargeable battery 12.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing an intermittent detection type fast charging and charging control circuit according to an embodiment of the present invention. The present invention relates to an interruption of an external wireless modem 10 which is a portable device using a rechargeable battery 12. Iii) detection-type fast charging and charging control circuit, which is capable of high-speed charging and does not require a blocking device between the rechargeable battery 4 and the main body circuit 13, thereby maximizing the efficiency of the rechargeable battery 4 while supplying an external ultra small power supply. In the switching operation between the device 14 and the internal rechargeable battery 12, no malfunction occurs so that the reliability of the external wireless modem 10, which is a portable device, can be improved.

The external wireless modem 10 includes an intermittent detection fast charging circuit 11, a nickel-cadmium-based, a nickel-hydrogen and a lithium ion-based rechargeable battery 12 and the main body circuit 13, the high-speed charging circuit Since the external micro power supply device 14 is connected to the 11, DC power through the fast charging circuit 11 is supplied to the main body circuit 13 through the rechargeable battery 2.

The nickel-cadmium-based, nickel-hydrogen-based and lithium ion-based rechargeable batteries 12 should theoretically have an output voltage determined in proportion to the remaining charge capacity, but in practice the output voltage has a change in impedance inside the rechargeable battery 12. Since it has a lot of influence, it is impossible to use it to detect the state of charge.

Therefore, the intermittent detection of the rechargeable battery 12 is to invent a fast charging and charging control circuit for the purpose of not affecting the internal impedance of the rechargeable battery 12, which is inside the rechargeable battery 12 Since the amount of current flowing and the influence of the internal impedance of the rechargeable battery 12 are proportional to each other, the output voltage of the rechargeable battery 12 is measured in the state of reducing the amount of current as much as possible, and the value thereof is checked to determine the state of charge of the rechargeable battery 12. It is used as data for.

That is, the intermittent detection type fast charging circuit 11 stops the charging operation unconditionally when the fast charging circuit 11 passes a predetermined time (about 15 seconds) for the intermittent detection application, and at this time, the output voltage of the rechargeable battery 12 is checked. If this value is higher than the reference value for detecting full charge, it will stop. If, for some reason, the check voltage falls below the reference value, the fast charging circuit 11 immediately operates to perform charging for a predetermined period and stop again to continue the voltage check.

Therefore, the intermittent detection-type fast charging circuit 11 always maintains the rechargeable battery 12 at 100% state of charge (1 to 2 hours after the start of charging), so that the user always carries a fully charged communication device. And going out is possible.

In addition, the intermittent detection-type fast charging circuit 11 has excellent utility when charging and discharging the rechargeable battery 12 at the same time, but an error occurs according to the type of the rechargeable battery 12 to prevent overcharge or low charge. Temperature proportional function.

In the above temperature proportional function, the impedance of all kinds of rechargeable batteries 12 varies irregularly with temperature, but since the temperature of the place is set between 10 ° C and 40 ° C, the proportional function within this temperature range can be easily realized. It is applied to the intermittent detection type fast charging circuit 11 as an exponential function.

Therefore, the intermittent detection fast charging and charging control circuit of the external wireless modem of the present invention is a fast charging of the rechargeable battery 12, a small adapter ultra small power supply 14, a built-in high efficiency and miniaturized fast charging circuit (11) Can be realized.

FIG. 3 is a detailed circuit diagram illustrating the intermittent detection type fast charging and charging control circuit of the present invention. The external wireless power supply device 14 is a built-in type of an external wireless modem 10 through a small adapter illustrated in FIG. And a high efficiency and miniaturized fast charging circuit 11 is connected, which is connected to the rechargeable battery 12 through the DC-DC converter 15 and the constant current and constant voltage front and rear at the 12-30V DC input terminal. The rechargeable battery 12 has a temperature sensor 16 attached thereto, and the output terminal is connected to the main body circuit 13 toward the + terminal side. The DC-DC converter 15 and the temperature sensor 16 of the rechargeable battery 12 are provided with a rechargeable battery high temperature protection unit 17, a rechargeable battery low temperature protection unit 18, and a rechargeable battery remaining amount checking unit 19, respectively.

The rechargeable battery high temperature protection unit 17 has a signal of the temperature sensor 16 connected to the output of the comparator CP2 of the DC-DC converter 15 and the remaining battery check unit 19 through a comparator CP1, respectively. . In the rechargeable battery low temperature protection unit 18, a signal of the temperature sensor 16 is connected to the DC-DC converter 15 through a comparator CP4 and a transistor Q1.

The rechargeable battery remaining check unit 19 is connected to the output of the rechargeable battery 12 and the signal of the temperature sensor 16 to the DC-DC converter 15 through a comparator (CP3) (CP2).

Therefore, the vehicle power source of 12-30V of the DC input terminal is connected to the switching circuit and the pre-voltage DC-DC converter 15 through the coil L4 and L9, the diode D3 and the capacitors C6 and C7 in parallel. The constant current resistors R21 and the constant voltage resistors R23 and R24 are provided before and after the DC-DC converter 15 so that the output voltage is reduced by the constant current and the constant voltage limit through the noise blocking coils L1 and L2. At the high-speed charging) is supplied to the main body circuit 13 shown in FIG. 2 through the output of the rechargeable battery 12 to operate the wireless modem normally.

In this case, the output voltage of the rechargeable battery 12 is checked to supply the + terminal of the comparator CP3 to the + terminal of the comparator CP3 through the resistors R1 and R2 of the battery remaining amount checking unit 19 so as to check the charging state. The output ⓐ of the temperature sensor 16 attached to the + terminal of the comparator CP1 in the rechargeable battery high temperature protection unit 17, the + terminal of the comparator CP4 in the rechargeable battery low temperature protection unit 18 and the remaining amount of the rechargeable battery The compensating resistors R6 and R5 in the check unit 19 are respectively supplied to the negative terminal of the comparator CP3.

First, the rechargeable battery remaining amount checking unit 19 intermittently detects the comparator when a constant time (about 15 seconds) is passed by the time constant C3R9 between the output of the comparator CP3 and the -terminal of the other comparator CP2. Through the CP2, the DC-DC converter 15 is temporarily not operated to stop the charging operation of the rechargeable battery 12 unconditionally.

At this time, the remaining battery check unit 19 checks the output voltage of the rechargeable battery 12 and stops continuously when this value is higher than the reference value for detecting the full charge, and if for some reason the check voltage is lowered below the reference value. If so, the battery remaining amount check unit 19 immediately operates to perform charging for a predetermined time and stop again to continue the voltage check.

Therefore, the intermittent detection-type fast charging and charging control circuit of the present invention ensures that the rechargeable battery 12 always maintains a 100% state of charge (1 to 2 hours after the start of charging), and thus a notebook computer (not shown). The user who uses the mobile always carry the fully charged external wireless modem 10 and can go out.

On the other hand, since an error occurs according to the type of the rechargeable battery 12, the temperature proportional function is used to prevent overcharge or low charge, which is a rechargeable battery high temperature protection unit attached to the temperature sensor 16 of the rechargeable battery 12 ( 17) and the rechargeable battery low temperature protection unit 18 to control the DC-DC converter 15.

When the internal temperature is 40 ° C. or more by fast charging the rechargeable battery 12, the temperature sensor 16 senses this and inputs the comparator CP1 in the rechargeable battery high temperature protection unit 17 to the set resistance values R16 and R17. As a result, the output of the comparator CP1 becomes low.

Then, since the DC-DC converter 15 is at the low level through the diode D2 on the output side of the comparator CP1, the DC-DC converter 15 is stopped.

In addition, when the internal temperature of the rechargeable battery 12 is within 10-40 ° C., DC-DC is operated by the operation of the rechargeable battery remaining check unit 19 which corrects an error according to temperature by using a temperature proportional function in the form of an exponential function. Since the converter 15 is operating, the rechargeable battery 12 may maintain 100% state of charge at any time.

When the internal temperature of the rechargeable battery 12 drops to 7 ° C., the battery 12 detects the temperature of the rechargeable battery 12 and inputs it to the comparator CP4 in the rechargeable battery low temperature protection unit 18. As a result, the output of the comparator CP4 becomes high level.

Therefore, the transistor Q1 is turned on to control the DC-DC converter 15 so that the rechargeable battery 12 can perform low-speed charging, which is fine charging.

Therefore, the present invention does not require a blocking device between the rechargeable battery 12 and the main body circuit 13, so that the efficiency of the rechargeable battery 12 is maximized while switching between the external power supply device 14 and the rechargeable battery 12. Since malfunction does not occur, it is possible to increase the reliability of the external wireless modem 10.

In addition, the intermittent detection-type fast charging and charging control circuit of the present invention can not only use the switching type in the external power supply device 14 but also determine the capacity according to the average power consumption of the main body circuit 13, the external wireless Compared to a method in which a conventional charging circuit for determining capacity according to the instantaneous maximum power consumption of the modem 10 is built into the main body, the size of the external power supply device 14 may be reduced to a maximum of 1/5 or less, which may be useful. .

As described above, according to the present invention, the rechargeable battery can be charged at high speed within 1 to 2 hours through the high speed charging circuit, and the switching type charging circuit can be used in a wireless device, so that the high speed charging circuit can be installed in the main body. Since no external charger is required, and no blocking device is required between the rechargeable battery and the main body circuit, the efficiency of the rechargeable battery is maximized, and no malfunction occurs even when switching between the external power supply and the rechargeable battery, thereby increasing the reliability of the device. Intermittent detection type fast charging and charging control circuit can be provided.

In addition, although the present invention has been described with an external wireless modem as an example, it may be used for other types of portable wireless devices without departing from the technical gist of the invention.

Claims (6)

The external wireless modem 10 is composed of an intermittent detection fast charging circuit 11, a nickel-cadmium-based, a nickel-hydrogen-based and a lithium ion-based rechargeable battery 12 and a main body circuit 13 to which a modem pack is mounted. An external micro power supply device 14 is connected to the fast charging circuit 11 so that DC power through the fast charging circuit 11 is supplied to the main body circuit 13 through the rechargeable battery 12. Intermittent detection type fast charge and charge control circuit. The method of claim 1, wherein the intermittent detection type fast charging circuit 11 stops the charging operation unconditionally when the high speed charging circuit 11 passes a predetermined time (about 15 seconds) in the intermittent detection application, An intermittent detection fast charging and charging control circuit characterized in that the output voltage is checked and the motor stops when the value is higher than a reference value for detecting a full charge. The rechargeable battery 12 is connected through the DC-DC converter 15 and the constant current and constant voltage parts at the front and rear at the 12-30V DC input terminal, and the temperature sensor 16 is attached to the rechargeable battery 12 while the output terminal is connected to the + terminal side. It is connected to the circuit 13, the DC-DC converter 15 and the temperature sensor 16 of the rechargeable battery 12, the rechargeable battery high temperature protection unit 17, the rechargeable battery low temperature protection unit 18 and the remaining battery charge check unit 19 Intermittent detection type fast charging and charging control circuit, characterized in that each installed. The battery residual quantity check unit 19 is a constant time (about 15 seconds) by the time constant C3R9 between the output of the comparator CP3 and the -terminal of the other comparator CP2 by intermittent detection. Intermittent detection fast charging and charging control circuit, characterized in that the DC-DC converter 15 is temporarily not operated through the comparator (CP2) to stop the charging operation of the rechargeable battery 12 unconditionally. 4. The DC-DC converter 15 is controlled by the rechargeable battery high temperature protection unit 17 and the rechargeable battery low temperature protection unit 18 attached to the temperature sensor 16 of the rechargeable battery 12. Intermittent detection type fast charging and charging control circuit. The method of claim 5, wherein when the internal temperature of the rechargeable battery 12 is within 10-40 ℃ the DC-DC converter 15 is operated by the operation of the battery remaining charge check unit 19 by the exponential function to always charge the rechargeable battery ( 12) intermittent detection fast charging and charging control circuit characterized in that the 100% state of charge.

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