CN1612436A - Charging circuit device for bridge battery - Google Patents

Abstract

The invention relates to a charging circuit device of bridge battery, which comprises: the charging circuit comprises a charging current control circuit, a charging voltage control circuit, a direct current charging current supply circuit and a switch circuit. The charging current control circuit can provide a larger rated charging current, and when the electric energy of the bridge battery enters a full state, the rated charging current is gradually closed. The charging voltage control circuit comprises a temperature compensation circuit, and can adjust the fixed voltage during charging according to the ambient temperature. The DC charging current providing circuit is used for continuously providing DC current for charging. And the switch circuit controls the connection or disconnection between the bridge battery and the application system. When the switch circuit connects the bridge battery and the application system, the charging circuit device of the bridge battery of the invention enables the charging current control circuit to stop providing the rated charging current. The invention has low cost, is suitable for wide temperature range and safe and quick charging, can ensure that the electric capacity of the bridge battery is always maintained in a full state, and can maintain good service life.

Description

Charging circuit device for bridge battery

technical field

The invention relates to a charging circuit device for a battery, in particular to a charging circuit device for a bridge battery. The device can cooperate with two charging modes of fast charging and trickle charging.

Background technique

Recently, many hardware or peripheral devices used in notebook computers (Notebooks) are equipped with the function of Hot Insertion Hot Swapping (Hot Insertion Hot Swapping). The so-called hot-swapping and hot-swapping function refers to replacing or inserting such as hard disk drive (hard disk drive), power supply, CD-ROM, etc. (CD-ROM drive) and other hardware, or peripheral devices such as keyboard and mouse, and when the device is added or removed from the computer, the operating system can automatically identify the function of the change. When hot plugging and hot swapping are performed, although the user does not need to shut down the system, some settings are still required. For example, before the user replaces the battery, the computer needs to be set in the battery swap mode (Battery Swap Mode) before the battery can be replaced. In the existing known technology, the battery exchange mode usually belongs to a low power mode (Low Power Mode), and the computer will stop the operation of the hard disk, turn off the screen, switch the central processing unit to a low power state or even a sleep state, etc., so as to maintain The electrical energy required for system operation is reduced to a minimum.

The power supply of a notebook computer usually has two types of batteries, a main battery (Main Battery) and a bridge battery (Bridge Battery). When the main battery is replaced, the responsibility to ensure that the stored data (data) is not lost will be transferred to random access memory (Random Access Memory, RAM), for example, Dynamic Random Access Memory (Dynamic Random Access Memory) can be used by Periodic recharging action, also known as refresh operation (Refresh Operation), to ensure data integrity and avoid data loss. The power required for the refreshing operation can be borne by the battery pack (Battery Pack) or the above-mentioned bridge battery. Since the capacity of the main battery usually lasts only about 3 to 4 hours, users who need to use the notebook computer for a long time usually have more than one main battery for replacement. When replacing the main battery, if the bridge battery is not in the state of power saturation, it will lead to incomplete refresh operation, thus causing the loss of valuable data (data) stored in the notebook computer or the occurrence of problems such as erroneous execution of wrong commands.

Ideally, it would be most desirable to be able to charge the bridge battery from low power to full power within 3 to 4 hours. Generally speaking, the full charging of the battery can be divided into two processes, rapid charging (Rushing Charge) and trickle charging (Trickling Charge). A trickle current is used to maintain the battery in a full state of power, and a full charge method can maintain a high battery life. However, there are two charging methods in the existing conventional technology, one is to use a single larger current to charge, and after the charging is completed, continue to charge with a large current, which will reduce the performance of the bridge battery useful life period. The other is to use a smaller current for charging. Although the life of the bridge battery can be maintained, due to the prolonged charging time of the bridge battery, when the main battery is replaced, the bridge battery will not be able to supply enough power due to incomplete charging. The power of the notebook computer will cause data loss or command error and other problems.

Based on the above, it can be seen that the charging circuit device of the existing known bridge battery has the problem that the charging current provided is too small, resulting in too long charging time, or the charging current provided is too large, which damages the inside of the battery and shortens the battery life. shortcoming. It can be seen that the above-mentioned existing bridge battery charging circuit device still has many defects, and needs to be further improved urgently.

Therefore, it is desired to design a fast charging circuit device that can provide the function of a constant voltage source and a constant current source of different current magnitudes under the consideration of low cost. The device can control the charging time of fully charging the electric energy to about 3 to 4 hours, and when the electric energy is full, a trickle current is still continuously used to keep the battery in a full state of electric energy. To improve the long charging time caused by the previously used charging circuit, or the charging current is too large, which reduces the battery life and other shortcomings.

In order to solve the problems existing in the charging circuit device of the existing bridge battery, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there is no suitable structure for general products to solve the problem. The above-mentioned problem is obviously a problem that relevant industry players are eager to solve.

In view of the defects existing in the charging circuit device of the above-mentioned existing bridge battery, the inventor actively researches and innovates on the basis of years of rich practical experience and professional knowledge engaged in the design and manufacture of this type of product, in order to create a new type of charging circuit for the bridge battery. The circuit device can improve the existing bridge battery charging circuit device to make it more practical. Through continuous research, design, and after repeated trial samples and improvements, the present invention with practical value is finally created.

Contents of the invention

The purpose of the present invention is to overcome the defects existing in the charging circuit device of the bridge battery and provide a new charging circuit device for the bridge battery. The technical problem to be solved is to enable it to provide Larger rated charging current, quickly fills up the bridge battery, and then only provides trickle current for continuous charging to keep the bridge battery in a full state of power, and has low-cost effects, especially suitable for portable computer systems or in the device.

Another object of the present invention is to provide a charging circuit device for a bridge battery. The technical problem to be solved is to provide a temperature compensation circuit to adjust the fixed voltage during charging according to the ambient temperature. Moreover, when the bridge battery provides electric energy to the application system, the present invention will stop providing the above-mentioned rated charging current, so that it is more suitable for practical use.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. A bridge battery charging circuit device according to the present invention includes: a charging current control circuit for providing a certain rated charging current, and when the electric energy of the bridge battery enters a full state, the rated charging current is gradually turned off ; A charging voltage control circuit, coupled to the charging current control circuit, for providing a fixed voltage and the rated charging current to charge the bridge battery, and including a temperature compensation circuit, which adjusts the fixed voltage according to the ambient temperature voltage; a DC charging current supply circuit, used to provide a DC current to charge the bridge battery; and a switch circuit, coupled to the bridge battery, used to control the connection and disconnection of the bridge battery and an application system One of the two; wherein when the switch circuit connects the bridge battery and the application system, the charging circuit device of the bridge battery stops the charging current control circuit from providing the rated charging current.

The purpose of the present invention and the solution to its technical problems are also achieved by the following technical solutions. A bridge battery charging circuit device according to the present invention includes: a first constant current source circuit, which determines whether to provide a first constant current source or not to provide the first constant current source according to a charging current control signal. Choose one; a constant voltage source circuit, coupled to the first constant current source circuit, for providing a constant voltage source and transmitting the first constant current source; a second constant current source circuit, coupled to the constant voltage source A circuit for providing a second constant current source; and a switch circuit, the switch circuit is coupled between the bridge battery and an application system, and is used to control the bridge battery and the application system according to the charging current control signal one of the on and off.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

The aforementioned bridge battery charging circuit device further includes a diode coupled between the constant voltage source circuit and the bridge battery for reverse bias protection.

The aforementioned charging circuit device for a bridge battery, wherein the first constant current source circuit includes: a first transistor, the first emitter/collector of the first transistor is coupled to the constant voltage source circuit; a collector resistor coupled to the second emitter/collector of the first transistor; a plurality of base resistors coupled to the base of the first transistor for providing a forward bias; and a switch device for According to the charging current control signal, one of the base resistors can be grounded or disconnected.

The aforementioned charging circuit device for a bridge battery, wherein the switching device includes: a switching transistor for controlling one of the base resistors to be grounded or not grounded according to the charging current control signal; and A resistor-capacitor network is coupled to the base of the switch transistor to provide a more stable charge current control signal.

The aforementioned charging circuit device for a bridge battery, wherein the constant voltage source circuit includes: a second transistor, the collector of the second transistor is coupled to the first constant current source circuit, and the emitter of the second transistor It is used to transmit the first constant current source and set an emitter voltage source as the output of the constant voltage source; and a plurality of fixed resistors are coupled to the base of the second transistor to provide bias voltage.

In the aforementioned charging circuit device for a bridge battery, the constant voltage source circuit further includes a temperature compensation circuit for adjusting the voltage of the constant voltage source according to the ambient temperature.

The charging circuit device of the aforementioned bridge battery, wherein the temperature compensation circuit includes: a battery temperature compensation system, the battery temperature compensation system is formed by parallel connection of a thermistor and a fixed resistance; and a circuit temperature compensation System, the circuit temperature compensation system is composed of a plurality of diodes connected in series.

In the aforementioned charging circuit device for a bridge battery, the number of the diodes is two.

In the aforementioned charging circuit device for a bridge battery, the switch circuit includes: a third transistor, which is used to control one of the source and the drain to be turned on or off according to the charging current control signal; and A base-source resistor is connected between the base and the source of the third transistor to provide bias voltage.

In the aforementioned bridge battery charging circuit device, the bridge battery is composed of a plurality of Ni-MH batteries connected in series.

In the aforementioned charging circuit device for a bridge battery, the application system includes a main battery for a notebook computer, and when the power of the main battery is exhausted, the bridge battery provides the power required by the notebook computer.

In the aforementioned charging circuit device for a bridge battery, the magnitude of the first constant current source is between 0.3 and 0.5 times the rated current of the battery.

In the aforementioned charging circuit device for a bridge battery, the size of the second constant current source is 1/30 times the rated current of the battery.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. As can be seen from the above technical solutions, in order to achieve the aforementioned object of the invention, the main technical contents of the present invention are as follows:

The present invention provides a charging circuit device for a bridge battery, which includes: a charging current control circuit, a charging voltage control circuit, a DC charging current supply circuit, and a switch circuit. The charging current control circuit can provide a fixed charging current, and when the electric energy of the bridge battery enters a full state, the fixed charging current is gradually turned off. The charging voltage control circuit is coupled to the charging current control circuit, which is used to provide a fixed voltage and charge the bridge battery with the above-mentioned rated charging current. The charging voltage control circuit also includes a temperature compensation circuit, which can adjust the ambient temperature to Adjust the fixed voltage when charging. The DC charging current supply circuit is used to provide DC current to charge the bridge battery. The switch circuit is coupled to the bridge battery and is used to control the connection or disconnection between the bridge battery and the application system. When the switch circuit connects the bridge battery and the application system, the bridge battery charging circuit device of the present invention stops the charging current control circuit from providing the rated charging current.

From another point of view, the present invention also provides a bridge battery charging circuit device to solve the above problems, the device at least includes a first constant current source circuit, a constant voltage source circuit, a second constant current source circuit , a bridge battery, and a switching circuit.

The first constant current source circuit provides a first constant current source, and the first constant current source is used when the bridge battery is rapidly charged, and gradually turns off the first constant current source when the charge enters a full state. The constant voltage source circuit is electrically connected to the first constant current source circuit, the constant voltage source circuit provides a constant voltage source as a charging voltage, and transmits the above-mentioned first constant current source as a charging current to charge the bridge battery, The constant voltage source circuit also includes a temperature compensation circuit, and the temperature compensation circuit can adjust the size of the constant voltage source according to the ambient temperature. The temperature compensation circuit in the embodiment is further divided into two systems, one is a battery temperature compensation system located close to the bridge battery, and the other is a circuit temperature compensation system located close to the charging circuit. The adjustment method of the temperature compensation circuit is to reduce the constant voltage source when the ambient temperature rises, and increase the constant voltage source when the ambient temperature decreases.

When the bridge battery is fully charged, the charging state will enter the trickle charging stage. At this time, the charging current continues to be charged by the second constant current source provided by the second constant current source circuit to charge the bridge battery. able to maintain fullness. The switch circuit is electrically connected to the bridge battery, and is used for connecting and disconnecting the connection between the bridge battery and an application system. Wherein, when the switch circuit connects the bridge battery and the application system, the first constant current source circuit stops providing the first constant current source. The charging device in the embodiment also includes a diode, the negative end of which is connected to the bridge battery, and the positive end is connected to the constant voltage source circuit. As a protection device when reverse bias occurs between the bridge battery and the constant voltage source circuit.

Since the above charging circuit device can be realized by components such as transistors and resistors, the cost is low. This device uses a constant voltage source and a limited current source for charging. The required charging time is 3 to 4 hours. It can fully charge the capacity of the bridge battery before the main battery is exhausted, and the size of the constant voltage source has temperature compensation. Circuit control, so what is provided is a safe and fast charging that is suitable for a wide temperature range. Since the second constant current source circuit provides a second constant current source as a trickle current, the capacity of the bridge battery can be kept in a full state forever. Because the charging process follows the full charge procedure, good bridge battery life is maintained.

It can be known from the above that the present invention relates to a charging circuit device for a bridge battery, which includes: a charging current control circuit, a charging voltage control circuit, a DC charging current supply circuit, and a switch circuit. The charging current control circuit can provide a larger rated charging current, and when the power of the bridge battery enters a full state, the rated charging current is gradually turned off. The charging voltage control circuit includes a temperature compensation circuit, which can adjust the fixed voltage during charging according to the ambient temperature. The DC charging current supply circuit is used to continuously provide DC current for charging. And the switch circuit controls the connection or disconnection between the bridge battery and the application system. When the switch circuit connects the bridge battery and the application system, the bridge battery charging circuit device of the present invention stops the charging current control circuit from providing the rated charging current.

By virtue of the above technical solution, the charging circuit device of the bridge battery of the present invention can provide a relatively large rated charging current under the condition of constant voltage, quickly charge the electric energy of the bridge battery, and then only provide trickle current for continuous charging, so as to It keeps the bridge battery fully charged and is especially suitable for use in portable computer systems or devices due to its low-cost performance. In addition, the present invention has a temperature compensation circuit, which can adjust the fixed voltage during charging according to the ambient temperature. Moreover, when the bridge battery provides electric energy to the application system, the present invention will stop providing the above-mentioned rated charging current, so that it is more suitable for practical use.

To sum up, the bridge battery charging circuit device with a special structure of the present invention has the above-mentioned many advantages and practical value, and there is no similar structural design published or used in similar products, so it is indeed an innovation. There are great improvements in structure or function, and great progress in technology, and have produced easy-to-use and practical effects, and have improved multiple functions compared with the existing bridge battery charging circuit device, thus It is more suitable for practical use, and has wide application value in the industry. It is a novel, progressive and practical new design.

The above description is only an overview of the technical solutions of the present invention. In order to understand the technical means of the present invention more clearly and implement them according to the contents of the description, the preferred embodiments of the present invention and accompanying drawings are described in detail below.

Description of drawings

FIG. 1 is a schematic block diagram of a charging circuit device according to a preferred embodiment of the present invention.

FIG. 2A is a graph showing charging characteristics of voltage versus time.

FIG. 2B is a graph showing charging characteristics of current versus time.

FIG. 3 is a device schematic diagram of a first constant current source circuit according to a preferred embodiment of the present invention.

FIG. 4 is a device schematic diagram of a switch circuit used in a first constant current source according to a preferred embodiment of the present invention.

FIG. 5 is a device schematic diagram of a constant voltage source circuit according to a preferred embodiment of the present invention.

FIG. 6 is a circuit diagram of a switch according to a preferred embodiment of the present invention.

105: The first constant current source circuit 107: Constant voltage source circuit

109: Second constant current source circuit 111: Bridge battery

113: Switch circuit 115: Application system

117: The first terminal 119: The second terminal

121: Charging control signal 123: Diode

301: Transistor 306～309: Fixed resistor

312: The first contact 315: The second contact

318: The third contact 404: Transistor

408: fixed capacitor 412: fixed resistor

501: Transistor 503～507: Fixed resistor

509: Thermistor 511, 513: Diode

601: Transistor 603: Fixed resistor

Detailed ways

The specific implementation, structure, features and functions of the bridge battery charging circuit device according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.

Please refer to FIG. 1 , which is a schematic block diagram of a charging circuit device according to a preferred embodiment of the present invention. The charging circuit device includes a first constant current source circuit 105 , a constant voltage source circuit 107 , a second constant current source circuit 109 , a bridge battery 111 , a switch circuit 113 and an application system 115 . The first terminal 117 of the constant voltage source circuit 107 is connected to the first constant current source circuit 105 , and the second terminal 119 is connected to the bridge battery 111 . The first constant current source circuit 105 determines whether to output the first constant current source to the constant voltage source circuit 107 according to the charging control signal 121 . In the case of rapid charging, firstly, the first constant current source circuit 105 provides a first constant current source to the constant voltage source circuit 107 . Next, the constant voltage source circuit 107 outputs a constant voltage source and transmits the first constant current source to the bridge battery 111 as the charging voltage and charging current required by the bridge battery 111 .

When the rapid charging is over and the trickle charging stage is entered, the bias voltage of the first constant current source circuit 105 will change due to the rise of the constant voltage source, and the first constant current source output to the constant voltage source circuit 107 will also be Then it gradually drops to the closed state. In the stage of trickle charging, the second constant current source provided by the second current source circuit 109 is used as the charging current to the bridge battery 111, and the constant voltage source provided by the constant voltage source circuit 107 is used as the charging voltage for the bridge battery. Perform trickle charging. When replacing the main battery, that is, when the bridge battery 111 needs to be used to provide electric energy, the switch circuit 113 can be driven by the charging control signal 121, so that the application system 115 and the bridge battery 111 are turned on, and the electric energy required by the application system 115 can be provided. . In this embodiment, a diode 123 is connected to the connection line between the second constant current source circuit 109 and the bridge battery 111, which is used to prevent reverse bias between the constant voltage source circuit 107 and the bridge battery 111. protection device. Although a diode is used in this embodiment, it is not limited to this in practical application.

To put it simply, the full charging process of the battery can be roughly divided into two stages: rapid charging and trickle charging. Please refer to the charging characteristic curve of voltage versus time shown in FIG. 2A , and the charging characteristic curve of current versus time shown in FIG. 2B . First of all, please refer to Figure 2A. Except for the change of voltage increase at the beginning of charging, the voltage is almost maintained at a constant during the full charging process, whether it is the rapid charging stage or the trickle charging stage. Status did not change. Next, as shown in FIG. 2B , at the beginning of the charging process, the current is kept at a constant high current, which is the rapid charging stage. After a period of time, the capacity of the battery tends to be saturated, and the current is gradually reduced to a very small current, and then it has been maintained at that very small current, which is the trickle charging stage. In this preferred embodiment, the large current required for rapid charging is provided by the first constant current source circuit 105, and the small current required for trickle charging is provided by the second constant current source circuit 109, and the two complement each other so that the bridge battery 111 A full charge can be achieved, and the life of the battery is thus avoided from being shortened due to the use of the correct charging method. In this embodiment, the magnitude of the high current is about 0.3 to 0.5 times the rated current of the battery, and the magnitude of the small current is 1/30 times the rated current of the battery.

Please refer to FIG. 3A , which is a device diagram of a first constant current source circuit according to a preferred embodiment of the present invention. The components used in the device include three fixed resistors 303, 306, 309 and a transistor 301, wherein the transistor 301 is a PNP type bipolar junction transistor (BipolarJunction Transistor, BJT). Select the appropriate fixed resistors 303, 306, 309 to provide appropriate bias voltage, so that the transistor 301 is turned on and works in the active linear region. During rapid charging, a fixed collector current can be output as the first constant current source. , the size of the collector current can be determined by the fixed resistors 303, 306, 309. During the trickle charging stage, as the constant voltage source gradually increases, the forward bias voltage gradually decreases, so that the transistor 301 is turned off and cannot continue to provide collector current. Whether it is rapid charging or trickle charging, the first constant current source circuit will drive the third contact 318 according to the charging current control signal 121, so that the first contact 312 that is closer to the fixed resistor 309 is connected to the second contact 315, which is simple In other words, the fixed resistor 309, that is, the base resistor of the transistor 301, is grounded to generate a forward bias voltage.

Next, please refer to FIG. 3B , which is a device schematic diagram of another first constant current source circuit according to a preferred embodiment of the present invention. In FIG. 3B , we provide another first constant current source circuit. The function of the first constant current source circuit is the same as that of the first constant current source circuit provided in FIG. 1A . Only in this figure, the original fixed resistor 303 is replaced by a diode 302a and a diode 302b.

Although the examples of two different first current source circuits have been cited above, it does not limit that the first current source circuit of the present invention must be designed in this way, and those skilled in the art can make according to the technical essence of the present invention. Various variations.

The above-mentioned first, second and third contacts 312, 315, 318 can actually be realized by using three terminals of a metal-oxide-semiconductor field effect transistor (Metal-Oxide-Semiconductor Field Effect Transistor, MOFET). Please refer to FIG. 4 , which is a schematic diagram of a switch circuit used in a first constant current source circuit according to a preferred embodiment of the present invention, wherein the source of the metal-oxide-semiconductor field effect transistor 404 is the first connection terminal 312, the drain as the second terminal 315, and the base as the third terminal 318, plus a fixed resistor 412 and a capacitor 408 to provide a bias voltage to determine whether to turn on or not to turn on the transistor 404 . In practical applications, a simple three-terminal switch can also be used instead, and it is not limited thereto.

Next, please refer to FIG. 5 , which is a schematic diagram of a constant voltage source circuit device according to a preferred embodiment of the present invention, and the device includes a temperature compensation circuit. Nickel-hydrogen batteries (Nickel-hydrogen Batteries) are a kind of high-efficiency batteries widely used in notebook computer products. Because it has a higher capacitance than nickel-cadmium batteries (Nickel-cadmium Batteries), it has a wider range of applications. The internal resistance of the Ni-MH battery will decrease as the temperature rises, causing the battery voltage to drop. If the voltage of the constant voltage source cannot be lowered as the temperature rises, the battery will be fully charged, but the first current source circuit cannot be completely closed, resulting in a Excessive trickle charging for a long time will lead to the problem of reduced battery life. Therefore, it is desirable to have a circuit device that adjusts the charging voltage lower when the ambient temperature rises, and adjusts the charging voltage higher when the ambient temperature drops. Therefore, in this embodiment, a temperature compensation circuit that can adjust the voltage according to the ambient temperature is provided. The position of the battery temperature compensation system composed of thermal resistance resistor 509 and fixed resistance 507 connected in parallel is close to the bridge battery 111, while the position of the circuit temperature compensation system composed of two diodes 511 and 513 connected in series is closer to the charging circuit.

In this embodiment, the transistor 501 uses an NPN bipolar junction transistor. The conduction voltage is provided by an appropriate combination of fixed resistors 503 and 505, so that the transistor 501 is turned on, and the emitter can output the first constant current source circuit input to the first constant current source of the collector and a constant voltage source to the bridge battery , which is the case of rapid charging. When entering the trickle charging phase, the transistor 501 will not provide the first constant current source to the bridge battery.

Finally, please refer to FIG. 6 , which is a device diagram of a switch circuit according to a preferred embodiment of the present invention. The device is disposed between the bridge battery 111 and the application system 115 , and decides to conduct or not conduct the connection between the bridge battery 111 and the application system 115 according to the charging current control signal 121 . The base of the transistor 601 receives the input of the charging current control signal 121, and a fixed resistor 603 is connected between the base and the source to provide an appropriate bias voltage when the transistor 601 is turned on. When the main battery is replaced, the charging current control signal 121 turns on the transistor 601 , and the application system 115 can use the electric energy provided by the bridge battery 111 . In this embodiment, the transistor 601 is a metal-oxide-semiconductor field effect transistor, but it is not limited to this in practical application.

The reason why the present invention strengthens the treatment of the trickle charge stage is that even when the electronic device is not in use, such as in a standby state, the battery pack configured therein will still discharge itself. If the battery is made of lithium materials, it will be discharged at an average of about 1% of the remaining capacity every day; if the battery is made of lithium materials, it will be discharged at an average of 0.2-0.3% of the remaining capacity every day. In order to maintain the bridge battery in a full state, it is necessary to provide a device for trickle charging. In a preferred embodiment of the present invention, the bridge battery can be formed by a plurality of Ni-MH batteries connected in series.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but all the content that does not depart from the technical solution of the present invention, according to the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments by the technical essence still belong to the scope of the technical solutions of the present invention.

Claims (14)

1. A charging circuit device for a bridge battery, characterized in that it comprises: A charging current control circuit, used to provide a fixed charging current, when the electric energy of the bridge battery enters a full state, gradually turn off the rated charging current; A charging voltage control circuit, coupled to the charging current control circuit, is used to provide a fixed voltage and the rated charging current to charge the bridge battery, and includes a temperature compensation circuit, which adjusts the fixed voltage according to the ambient temperature ; a DC charging current supply circuit for providing a DC current to charge the bridge battery; and a switch circuit, coupled to the bridge battery, for controlling one of the connection and disconnection of the bridge battery and an application system; Wherein when the switch circuit connects the bridge battery and the application system, the charging circuit device of the bridge battery stops the charging current control circuit from providing the rated charging current. 2. A charging circuit device for a bridge battery, characterized in that it comprises: A first constant current source circuit, according to a charging current control signal, decides whether to provide a first constant current source or not to provide the first constant current source; A constant voltage source circuit, coupled to the first constant current source circuit, for providing a constant voltage source and transmitting the first constant current source; A second constant current source circuit, coupled to the constant voltage source circuit, for providing a second constant current source; and A switch circuit, the switch circuit is coupled between the bridge battery and an application system, and is used to control the connection and disconnection between the bridge battery and the application system according to the charging current control signal 3. The bridge battery charging circuit device according to claim 2, further comprising a diode coupled between the constant voltage source circuit and the bridge battery for reverse bias protection. 4. The charging circuit device for a bridge battery according to claim 2, wherein said first constant current source circuit includes: a first transistor, the first emitter/collector of the first transistor is coupled to the constant voltage source circuit; an emitter/collector resistor coupled to the second emitter/collector of the first transistor; a plurality of base resistors coupled to the base of the first transistor for providing forward bias; and A switch device is used for selecting one of grounding and disconnecting one of the base resistors according to the charging current control signal. 5. The charging circuit device for a bridge battery according to claim 4, wherein said switching device comprises: a switch transistor, used to control one of the base resistors to be grounded or not grounded according to the charging current control signal; and A resistor-capacitor network is coupled to the base of the switch transistor to provide a more stable charge current control signal. 6. The charging circuit device for a bridge battery according to claim 2, wherein said constant voltage source circuit includes: A second transistor, the collector of the second transistor is coupled to the first constant current source circuit, the emitter of the second transistor is used to transmit the first constant current source, and an emitter voltage source is set as the constant voltage source output; and A plurality of fixed resistors are coupled to the base of the second transistor for providing bias voltage. 7. The charging circuit device for a bridge battery according to claim 6, wherein said constant voltage source circuit further comprises a temperature compensation circuit for adjusting the voltage of the constant voltage source according to the ambient temperature. 8. The charging circuit device for a bridge battery according to claim 7, wherein said temperature compensation circuit includes: A battery temperature compensation system, the battery temperature compensation system is formed by connecting a thermistor and a fixed resistor in parallel; and A circuit temperature compensation system, the circuit temperature compensation system is composed of a plurality of diodes connected in series. 9. The charging circuit device for a bridge battery according to claim 8, wherein the number of said diodes is two. 10. The charging circuit device for a bridge battery according to claim 2, wherein said switch circuit comprises: a third transistor, used to control one of the source and the drain to be turned on or off according to the charging current control signal; and A base-source resistor is connected between the base and the source of the third transistor to provide bias voltage. 11. The bridge battery charging circuit device according to claim 2, wherein said bridge battery is composed of a plurality of Ni-MH batteries connected in series. 12. The bridge battery charging circuit device according to claim 2, wherein said application system includes a main battery for a notebook computer, and when the power of the main battery is exhausted, the bridge battery Provides the power required by the notebook computer. 13. The charging circuit device for a bridge battery according to claim 2, wherein the first constant current source is between 0.3 and 0.5 times the rated current of the battery. 14. The charging circuit device for a bridge battery according to claim 2, wherein the second constant current source is 1/30 times the rated current of the battery.

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