KR19980077419A - Battery charging current control device and method by a portable device - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

The present invention relates to a technology for controlling battery charging of a cordless telephone.

I. The technical problem that the invention is trying to solve

The present invention provides an apparatus and method for efficiently controlling the charging of a battery and protecting its life by checking a state of a rechargeable battery and transmitting the result to a fixed device.

All. Summary of Solution of the Invention

In the present embodiment, the apparatus and method control the battery charge current by the portable device to check the state of the battery and transmit the state data to the fixed device. The fixed device charge current according to the state of charge of the battery according to the state data received from the portable device. It is characterized by adopting a feedback system for generating and flowing to the battery.

la. Important uses of the invention

It is used to enable efficient charging of cordless phone rechargeable batteries and to protect battery life by preventing overcharging.

Description

Battery charging current control device and method by a portable device

The present invention relates to an apparatus and a method for controlling the charging of a battery in a wireless telephone, and more particularly, to a feedback type battery charging current control apparatus and method by a portable device.

Cordless phones use rechargeable batteries to power portable devices. Talk time and standby time are determined by the capacity of this battery. In addition, the degree of use of the battery determines the efficient use and duration of use of the cordless phone. However, considering the cost reduction and design specifications of the wireless telephone, the charging of the battery is made by a simple constant voltage or constant current method by the charging circuit in the fixed device. In addition, a method in which the portable device calculates the time spaced apart from the fixed device (charger) and controls the charging amount according to the time may be used. Thus, the problem of the non-feedback method which consists of only a constant voltage or a constant current to ignore the state of a battery so far is as follows.

First, even though the battery is fully charged when the battery is charged by the constant current, the charging current or the battery may be heated to a high temperature because the charging current continues to flow to the battery, causing a shortening of the battery life.

Secondly, automatic fast charging is not possible in a low battery condition and there is a fast charging mode, but most rely on manual operation.

Third, in the case of constant voltage charging, it is difficult to set a proper charging voltage due to the characteristics of the battery. If the charging voltage is set high, it causes a shortening of the life of the battery.

In order to solve the above problems, it is necessary to use a charge-only IC or a component capable of detecting a battery state, but this is one factor causing an increase in material costs.

Accordingly, an object of the present invention is to provide an apparatus and method for efficiently controlling the charging of a battery and protecting its life by checking a state of a rechargeable battery and transmitting the result to a fixed device.

1 is a block diagram of a digital radiotelephone to which the present invention is applied

2 is a flowchart illustrating an operation process of a portable device for controlling battery charging current according to an embodiment of the present invention.

3 is a flowchart illustrating an operation process of a fixing device for controlling battery charging current according to an embodiment of the present invention.

4 is a charging characteristic diagram of a nickel-cadmium (Ni-Cd) battery

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, numerous specific details such as components of specific circuits are shown, which are provided to help a more general understanding of the present invention, and it is understood that the present invention may be practiced without these specific details. It will be self-evident to those of ordinary knowledge. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a configuration diagram of a digital radiotelephone to which the present invention is applied and includes a fixed device 100 and a portable device 200. The fixed device 100 is connected through an exchange and a telephone line to perform a wired communication function, and the portable device 200 forms a wireless link with a wireless unit of the fixed device 100 to perform a wireless communication function.

First, the configuration and operation of the fixing device 100 will be described. The fixing device control unit 31 collectively controls the overall operation of the fixing device 100. The fixed device controller 31 is a one chip microprocessor, and includes a ROM for storing a program and a RAM for temporarily storing data generated during program execution. The transmitter 33 modulates and frequency-converts the data output from the fixed device controller 31 or the voice signal output from the microphone 42 and outputs the result in the form of a wireless signal. The transmission and reception separation unit 35 separates transmission and reception of the radio signal to be transmitted or received and transmitted to the antenna 43. The receiver 14 converts and demodulates the received radio signal separated by the transmit / receive separator 35 to transmit the voice signal to the speaker 41 and the data to the fixed device controller 31. The frequency synthesizer 40 generates a frequency for designating a transmission / reception channel of the transmitter 35 and the receiver 34 under the control of the fixed device controller 31. The trunk line connecting unit 32 is connected to the switching network by wire, and interfaces signals (eg, ring signals) between the fixed device 100 and the control unit of the switching network for connection with the switching network. In addition, the trunk line connecting unit 32 interfaces a voice signal between the fixing device 100 and the switching network. The power supply unit 36 inputs the power Vc supplied by the power adapter from the outside and transfers the power Vc to each part of the fixing device 100. The charging unit 37 is supplied with power Vc from the outside, and receives predetermined control to charge the predetermined power to the battery 19 of the portable apparatus 200. The charging current controller 45 controls the charging current so that the charging operation of the charging unit 37 is divided into rapid, normal, half or intermittent charging under the control of the fixing device controller 31. The charging terminal 38 is connected to the charging terminal 20 of the portable device 200 when the portable device 200 is mounted on the fixing device 100 to transfer the power Vc to the battery 19.

Next, the configuration and operation of the portable apparatus 200 will be described. The portable apparatus controller 11 collectively controls the overall operation of the portable apparatus 200. The data output from the portable device controller 11 or the voice signal output from the microphone 17 is modulated and frequency-converted and output in the form of a wireless signal. The transmission and reception separation unit 15 separates transmission and reception of the radio signal to be transmitted or received and transmitted to the antenna 27. The receiving unit 14 converts and demodulates the received radio signal separated by the transmitting / receiving separating unit 15 to transmit a voice signal to the speaker 18 and transmits data to the portable device controller 11. The frequency synthesizer 26 generates a frequency for designating a transmission / reception channel of the transmitter 13 and the receiver 14 under the control of the portable device controller 11. The key input unit 21 includes a plurality of keys for dialing and various keys such as a call key or a call termination key. The tone generating unit 16 generates a warning sound for notifying the user of various operating states of the portable device under the control of the portable device controller 11 and outputs it to the buzzer 25. The voltage detector 24 detects a voltage of the battery 19 and informs the portable device controller 11. The charging terminal 20 is connected to the charging terminal 38 of the fixing device 100 when the portable device 200 is mounted on the fixing device 100.

2 is a flowchart illustrating an operation process of a portable device for controlling a battery charging current according to an embodiment of the present invention, and showing a process of checking a battery state. In operation 2a, the portable device controller 11, which is in a standby state for a predetermined time, senses the voltage level of the battery 19 through the voltage detector 24 in operation 2b. In step 2c, the detected voltage level is registered in the register. In step 2d, the mobile device 200 is placed on the fixed device 100 to check whether it is being charged (charging mode). If the check result is charging, in step 2e to form a wireless channel with the fixing device 100. In step 2f, the voltage level data of the battery registered in the register is transmitted to the fixing device 100 through the RF transmitter 13, the transceiver separator 15, and the antenna 27. After the transmission, the radio channel is released in step 2g, and the process returns to step 2d. The operation from then on is to continuously check the voltage level of the battery during charging and update the result to the register.

3 is a flowchart illustrating an operation process of a fixing device for controlling battery charging current according to an embodiment of the present invention. When the wireless channel is formed with the portable device 200 in step 3a, the register value, that is, battery voltage level data transmitted from the portable device 200 is received through the antenna 43, the transceiver 35 and the RF receiver 34 in step 3b. After the reception, the wireless channel is released in step 3c. In step 3d, it is checked whether the battery voltage level is higher than a second reference voltage. If the check result is less than the second reference voltage, the process proceeds to step 3g to allow rapid charging. That is, in FIG. 1, the rapid charging signal is generated by the charging current control unit 45 to allow the charging unit 37 to rapidly charge. On the other hand, if the battery voltage level is greater than the second reference voltage, the check proceeds to step 3e to check whether the battery voltage level is lower than the first reference voltage. If the check result is less than the first reference voltage, the process proceeds to step 3f to allow normal charging. That is, a normal charging signal is generated by the charging current controller 45 to allow the charging unit 37 to charge normally. After the predetermined charging in the steps 3f and 3g, the process returns to the step 3a, which rechecks the voltage level of the battery that changes as the rapid or normal charging progresses until the battery is fully charged and adaptively adapts to the degree of change. This is to control the charging current.

In addition, if the battery voltage level is greater than or equal to the first reference voltage in step 3e, the process proceeds to step 3h to perform half charging. That is, the charging current control unit 45 generates a half charging signal so that the charging unit 37 generates a charging current suitable for half charging. Thereafter, in step 3i, it is checked whether 2 hours have elapsed after the start of the half charge, and if it is determined that 2 hours have elapsed, the process proceeds to step 3j to allow intermittent charging. In other words, the charging current controller 45 generates an intermittent charging signal. In this case, the charging unit 37 adjusts the generation of the charging current to occur in accordance with the intermittent charging.

4 is a charging characteristic diagram of a nickel-cadmium (Ni-Cd) battery, and is an example for explaining the present invention when applied to the nickel-cadnium battery. The first and second reference voltages described above correspond to reference numerals ⓒ and ⓑ, respectively. That is, the first reference voltage is 4.2 volts, and the second reference voltage is 3.4 volts.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention allows the portable device to check the state of the rechargeable battery and transmit the result to the fixed device, thereby allowing the fixed device to adjust the charging current of the battery so that charging is efficiently controlled and overcharge is prevented. There is this. In addition, there is an advantage in protecting the life of the battery.

Claims (4)

In the battery charging current control device of a wireless telephone having a portable device and a fixed device, A portable device having a voltage detector detecting a voltage level of the battery, and transmitting the detected battery voltage level data to the fixed device through a wireless channel; A charging unit for supplying a predetermined charging current to the battery through a charging terminal in contact with the portable device, and a charging unit charging current control unit for controlling current generation of the charging unit. Receives battery voltage level data transmitted from a portable device at predetermined cycles and compares it with predetermined reference values to determine whether it is fast, normal or semi-charged, and according to the determination, a fixed device for controlling the charging current controller. Device. The method of claim 1, wherein the fixing device, And a timer is driven with the start of the half charge to control the charging current controller to intermittently charge a predetermined time. In the battery charging current control method by a portable device of a wireless telephone having a portable device and a fixed device, A first step of the portable device detecting a voltage level of the battery; A second process of determining, by the portable device, whether the current state is a charging mode after detecting the voltage level of the battery; A third step of, when the determination result is the charging mode, the portable device forms a wireless channel with the fixed device, sends the detected battery voltage level to the fixed device, and then releases the wireless channel; In the fixed device, a fourth process of analyzing the battery voltage level received from the portable device to determine whether it is fast, normal, or half charged, and controlling charging current according to the determination to start charging; During charging, the portable device periodically detects the voltage level of the battery, forms a wireless channel with the fixed device, and sends the detected battery voltage level to the fixed device to analyze the battery voltage level received by the fixed device. And a fifth process of determining whether to charge fast or normal or half charge and controlling charging current according to the determination. The method of claim 3, wherein in the fourth process, And a sixth step of controlling the charging current so that intermittent charging is performed after a predetermined time has passed since the start of the half charging.