CN1202685C

CN1202685C - Uninterrupted charging power supply system for mobile phone

Info

Publication number: CN1202685C
Application number: CNB021063869A
Authority: CN
Inventors: 范书增
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-03-11
Filing date: 2002-03-11
Publication date: 2005-05-18
Anticipated expiration: 2022-03-11
Also published as: CN1444415A

Abstract

The invention relates to a power supply system device for charging a mobile phone (mobile phone). In the past, mobile phones are generally charged without an alternating current power grid. When people go out, the mobile phone cannot be used without electricity. The invention is made for solving the problem of charging the mobile phone under the condition of no AC power supply. The device can be carried about, and can charge the mobile phone at any time, so that the mobile phone can work uninterruptedly. The energy source adopted by the device can be a No. 5 disposable common zinc-manganese dry battery which is easy to find everywhere, and also can be a No. 5 secondary nickel-hydrogen dry battery or a small-sized totally-enclosed maintenance-free lead-acid storage battery, and the device is convenient to carry. The system mainly comprises a charging power supply and a charger for charging the charging power supply. The charger can charge the charging power supply which uses the nickel-hydrogen dry battery and the lead-acid battery as energy sources quickly and safely, and can also charge the charging power supply which uses the disposable common zinc-manganese dry battery as energy sources, thereby reducing the use cost of the disposable battery.

Description

Uninterrupted charging power supply system for mobile phone

Technical Field

The invention relates to a system device for charging a mobile phone (mobile phone).

Background

The invention of the mobile phone brings great convenience to the work and life of people, at present, china becomes the country with the largest amount of mobile phones, and the relation between people and mobile phones is more and more close. A nickel-lithium or nickel-hydrogen storage battery is used as an energy source in the mobile phone, when the electric energy is exhausted, the battery needs to be charged, and at present, people generally cannot leave an alternating current power grid for charging the mobile phone. When the mobile phone of people on the way of traveling is out of power, the mobile phone cannot find the alternating current power grid for charging, and cannot be used, so that inconvenience is caused.

Disclosure of Invention

The invention can charge the mobile phone at any time by using the portable charging power supply under the condition of being separated from the AC power grid, so that the mobile phone can work continuously.

The technical scheme mainly comprises a charging power supply and a charger for charging the charging power supply. The charging power supply circuit is shown in fig. 2 and 4, and the components and the battery device in the circuit are in the charging power supply box shown in fig. 1. A charger circuit for charging the charging power supply is shown in fig. 5. When the mobile phone is charged, the charging power supply is connected with the mobile phone through the connecting line shown in fig. 3. When the charger charges the charging power supply, the charging power supply is connected through a small two-wire plug connecting line as shown in fig. 6.

The charging power supply box is shown in fig. 1, wherein 3 is a box cover, 1 and 2 parts are box bottoms, 1 is a circuit control bin, 2 is a battery bin, and 4 is a circuit control bin cover. The battery is arranged in the battery compartment 2, and the components of the control circuit are arranged in the circuit control compartment 1.

The simplest charging power control circuit is shown in fig. 2. Wherein E is a battery pack, and can adopt a No. 5 common zinc-manganese dry battery, a No. 5 nickel-hydrogen dry battery or a small-sized totally-enclosed maintenance-free lead-acid storage battery, and R ₁ In order to control the resistance, Z and F are output jacks, Z is a positive pole, and F is a negative pole.

Fig. 3 is a connection line between the charging power supply box and the mobile phone. In fig. 3, 31 is a conducting wire, 32 is a hollow plug matched with the Z and F jacks in fig. 2, and 33 is a plug matched with a mobile phone charging jack.

According to the type, voltage and capacity of the storage battery in the mobile phone, selecting a charging power supply battery and a resistor R with proper resistance value ₁ ，R ₁ The function of the charging control circuit is to control the maximum charging current of the charging power supply battery to the mobile phone not to exceed the maximum current which can be received by the mobile phone battery so as to protect the mobile phone battery. Charging power supply battery and R ₁ After the device is selected and connected, the charging power box and the mobile phone are connected through a connecting line shown in fig. 3, and the mobile phone can be charged by connecting the charging power box and the mobile phone on fire.

When the mobile phone starts to charge, because the voltage of the mobile phone battery is lower, the voltage of the charging power supply battery is higher, and the charging current is larger (through experiments, the time of large current can only last for 1-2 minutes), along with the development of the charging process, the voltage of the mobile phone battery is increased due to charging, and the voltage of the charging power supply battery is reduced due to discharging, so the charging current can be gradually reduced. When the current drops to a small value, the charging current in the circuit no longer needs R ₁ Control but R ₁ But still consumes power in the circuit and affects the charging speed. In order to not only limit the excessive current at the time of starting charging, but also properly reduce R ₁ For the consumption of electric energy, the electric energy utilization rate and the charging efficiency are improved, and a current-limiting protection automatic control circuit shown in figure 4 is designed. In the circuit, S ₁ Is a single-pole double-set switch. When charging the mobile phone, S ₁ Is placed at the position of '1', and the branch E of the power supply of the circuit and the left part thereof are similar to the circuit shown in FIG. 2By contrast, increase by V ₁ 、R ₄₂ 、R ₄₃ 、R ₄₄ 、R ₄₁ Over-current shunt control circuit composed of V ₂ 、R ₄₅ Forming a display circuit. The operating principle of the circuit is that V ₁ 、R ₄₂ Whether a branch is conducted or not depends on V ₁ Emitter junction voltage U of _GP And U is _GP ＝U _GH +U _HP When charging is started, if an excessive charging current occurs, R ₁ Voltage V across _HP Is also larger, thereby making V larger ₁ Voltage of emitter junction, U _GP Is also larger, resulting in V ₁ Is conducted to form a branch for supplying current to the power supply EThe current charged in the mobile phone is reduced, when the voltage of the mobile phone battery increases along with the increase of the charging start, the voltage of the charging power supply E is reduced, and the overlarge charging current is quickly reduced to a normal value (the time is generally 1-2 minutes), at this time, R ₄₁ The voltage at both ends is also reduced, so that V is reduced _GP Become smaller as long as R ₄₄ 、R ₄₃ The resistance value parameter is configured properly, so that V can be enabled ₁ 、R ₄₂ The branch is cut off, so that almost all the current supplied by the power supply is used for charging the mobile phone. At this time, due to R ₄₁ The resistance is small, so the consumption of electric energy is small, and the charging current will not be too small in the later stage of charging, so the charging speed can be increased, and the purpose of increasing the utilization rate of electric energy and the charging efficiency can be achieved.

The power source E in the figures 2 and 4 can adopt a disposable No. 5 common zinc-manganese dry battery, a No. 5 nickel-hydrogen dry battery and a maintenance-free sealed lead-acid storage battery with smaller capacity. The common advantages of the 5 # battery are small volume, light weight (only 100 g), easy carrying, and the disposable 5 # battery has the advantages that the battery can be used after being put into a charging power box, and can be replaced by a new battery after electricity is used up, but the disposable 5 # battery has the disadvantages of higher disposable cost, and the use of the nickel-hydrogen 5 # battery is opposite, and the disposable 5 # battery has the advantages of long-term repeated charging and use and low cost, but has the disadvantages that the battery must be charged firstly before charging the mobile phone, the first purchase cost is higher, and the totally-closed maintenance-free lead acid storage battery is adopted, compared with the nickel-hydrogen storage battery, the disposable 5 # battery has the advantages of large capacity, and can charge the mobile phone for a plurality of times after being charged for one time, for example, after a lead acid storage battery with 6V and 4Ah is fully charged, the battery can charge the mobile phone for 4-8 times (different due to the different capacities of the mobile phone batteries), and the nickel-hydrogen 5 # battery can charge the mobile phone for 1-2 times. The disadvantage is the somewhat large volume and weight.

The charging power supply using nickel-hydrogen or lead-acid accumulator as energy source must be equipped with a charger for self-charging. The common zinc-manganese dry battery is used as a charging power supply of energy, and the battery can be better if being charged. The conventional storage battery chargers in the market at present have overlong charging time, for example, a 1300mAh nickel-hydrogen storage battery 5 needs 14-16 hours for charging, a quick charging device needs 7-8 hours for charging, the charging time needs to be calculated according to a formula on a specification for different batteries, and the batteries can be damaged by charging once the power supply is forgotten to be cut off on time. The charger circuit designed by the device system is shown in figure 5. It can not only charge nickel-hydrogen and lead-acid accumulator quickly and safely, but also charge common zinc-manganese accumulator, so that it can overcome the defect of high cost of disposable accumulator.

In the charger circuit shown in fig. 5, a and B are 220V ac power input terminals, and D and O are dc output terminals. The whole circuit consists of five parts. One is formed by a resistor R ₅₁ Capacitor C ₁ 、C ₂ Switch S and rectifier diode V ₅₁ 、V ₅₂ 、V ₅₃ 、 V ₅₄ A voltage-reducing rectification circuit composed of a voltage-stabilizing tube V ₅₁₁ The third is composed of a resistor R ₅₃ 、R ₅₄ 、 R ₅₅ 、R ₅₇ S, triode V, switch ₅₁₀ A charging current control circuit composed of a rectifier diode V ₅₅ 、V ₅₆ 、 V ₅₇ Arc tube V ₅₁₂ And a resistance R ₅₂ A charging display circuit composed of a rectifier diode V ₅₈ 、V ₅₉ And a resistor R ₅₆ And luminous tube V ₅₁₃ To form a sufficient display circuit.

The first part of the voltage reduction rectification circuit has the functions of reducing voltage and changing alternating current into the alternating current with Z ₅ Is a positive electrode F ₅ Is the pulsating direct current of the tributary pole.

Second partial circuit, stabilivolt V ₅₁₁ The function of the display circuit is to limit the maximum voltage value of the following third part of the charging current control circuit and the fifth part of the full display circuit, and protect elements in the two parts of the circuit from being damaged due to high voltage bearing.

The function of the third partial circuit is to control the charging current. After the input end is connected with 220V AC power supply and the output ends D and O are connected with the charged battery (D is connected with the anode and O is connected with the cathode), according to the circuit theory, the total DC pulsating current supplied by the rectifying output end is mainly formed by a capacitor C ₁ 、C ₂ Is approximately a constant current source, and the current is output and then flows into V respectively ₅₁₁ Branch, R ₅₃ 、R ₅₄ 、R ₅₅ Branch, R ₅₇ 、V ₅₁₀ Branch and charged battery branch, since V is selected ₅₁₁ When the voltage-stabilizing value parameter is greater than the total voltage of the charged battery by a certain value, the battery is basically not conducted or only has extremely small current R during normal charging ₅₃ 、 R ₅₄ And R ₅₅ Has a relatively large equivalent resistance value, and has only a very small current in the branch, so that the current in the circuit mainly consists of the current flowing into the charged battery and the R ₅₇ 、V ₅₁₀ The current in the branch consists of two parts. At the start of charging, the voltage of the battery to be charged is low, so that the voltages of G and J in the circuit are also low, and V is ₅₁₀ Emitter junction voltage V _HJ That is to say R ₅₄ 、R ₅₅ The voltage across is also lower, V ₅₁₀ In the off state, R ₅₇ 、V ₅₁₀ Branch circuitIn the middle of no current, when the circuit is formed by Z ₅ Terminal endThe vast majority of the output current flows into the charged battery. At this time, the battery is charged at a faster speed, and the voltage of the charged battery is continuously increased along with the charging process, so that the voltage U is increased _GJ 、U _HJ Is raised to make V ₅₁₀ Into a conducting state, R ₅₇ 、V ₅₁₀ The branch starts to shunt current and the higher the voltage of the charged battery is, the higher R ₅₇ 、V ₅₁₀ The larger the current of the branch is, the current supplied from the Z5 end is approximately a constant current source, so the current is along with R ₅₇ 、V ₅₁₀ The current charged into the battery is reduced due to the increase of the branch current, and when the charged battery is sufficient, the charging current is reduced to be within the safe charging current value. The battery can not be damaged after long-time charging. The charging current curve is shown in fig. 8, so that the circuit can realize the quick charging of the battery, is one hundred percent sufficient under the condition of sufficient time, and can automatically realize the overcharge protection after sufficient time.

The function of the fourth part of the circuit is charging display. When D and O terminals are connected into the battery to be charged, V ₅₇ With current passing through Z ₅ D, voltage between D, by V ₅₅ 、V ₅₆ 、V ₅₇ Three rectifier diodes are limited to about 0.7V multiplied by 3=2.1V, and a luminous tube V ₅₁₂ Series resistance R ₅₂ Is connected at the rear to V ₅₅ 、V ₅₆ 、V ₅₇ Two ends of the battery will emit light to indicate the normal charging, when the charged battery pack is not connected or is not connected, V ₅₇ No current passing, V ₅₁₂ Will not emit light, V ₅₁₂ Whether or not to emit light indicates whether or not charging is in progress, R ₅₂ Has the effect of making V ₅₁₂ A current of moderate magnitude is defined.

The function of the fifth part of the circuit is to fully display. When the charged battery is fast enough, R ₅₇ 、V ₅₁₀ After branch is conducted, V ₅₈ 、V ₅₉ 、 R ₅₆ When the current passes through, V is gradually increased along with the increase of the conduction current ₅₈ 、V ₅₉ 、R ₅₆ The voltage at both ends will gradually increase, when reaching V ₅₁₃ When the required voltage value is conducted, V ₅₁₃ Will be turned on to emit light and flow through R ₅₇ 、V ₅₁₀ The larger the current of the branch, V ₅₁₃ The higher the brightness of the light source, so that the secondary light-emitting tube V ₅₁₃ Whether the battery is bright or not and the brightness can visually indicate the charging process.

When the circuit is used for charging different types of batteries, the maximum charging current required by the batteries is different, and the charged voltages are different, so that parameters of related elements in the charging circuit need to be properly adjusted according to the different types of batteries. The double-pole double-set switch S in the circuit is used for adjusting the circuit to adapt to charging of different batteries. Such as charging nickel hydrogen batteries, a larger current may be used and S may be placed in the position shown in fig. 5. When charging ordinary zinc-manganese dry cell, S is needed to be arranged at another position to make capacitor C ₂ Opening, R ₅₅ Is connected to R ₅₄ And (4) connecting in parallel.

Two output positive and negative terminals (D, O) of the charger and the positive and negative terminals of the charging power supply box (figure 1D) ₁ 、O ₁ ) Both are provided with a two-wire outlet as shown in fig. 7 for connection, and the two parts are connected with each other through a two-wire plug wire as shown in fig. 6.

The small two-wire socket shown in fig. 7 is provided with screw holes (72) for inserting and fixing screws, metal posts (73) for circuit connection, and semicircular positioning projections (71) are provided in the insertion holes.

The two-wire patch cord shown in fig. 6 consists of a two-conductor (64) and two-end patches (61). Each plug consists of an upper plastic shell and a lower plastic shell, a semicircular positioning notch (62) is arranged at the inserting end of the upper half part, two metal pipes (63) are arranged in one end connected with the socket, the upper plastic shell and the lower plastic shell are clamped through fixing screws (65), and the two metal pipes are respectively welded with one corresponding double lead (64).

When the charger is used for charging a battery in the charging power supply, the charger is connected with the charging power supply box by using the small two-wire plug wire, and the A end and the B end of the charger are connected with a 220V alternating current power supply. When the plug of the small two-wire plug wire is inserted into the socket in the charger and the charging power box, the plug can be inserted only when the positioning convex block (71) on the socket is aligned with the positioning notch (62) on the plug, otherwise, the plug cannot be inserted. Therefore, when the charger and the charging power supply box are connected, the two ends of the anode D and the cathode O of the output end of the charger are respectively connected with the two ends of the anode D1 and the cathode O1 of the power supply in the charging power supply box, and wrong connection cannot occur.

Socket Z, F, small two-wire socket D in circuit of fig. 4 ₁ O ₁ And a switch S ₁ And S ₂ The device is in a circuit control chamber (position of '1' in the figure) as shown in figure 1, wherein S ₂ Is a button double-pole switch, after all elements in the control cabin are connected in parallel, the circuit control cabin cover (4 in figure 1) is covered and sealed by glue, only S ₂ The button is exposed out of the bin cover through a round hole (5 in figure 1) on the circuit control bin cover, and when the power supply bin cover (3 in figure 1) is opened, a switch S is arranged ₂ In the off state, S only when the power supply box cover is closed ₂ Is in the closed state. Its function is to ensure the safety of charging.

The charger has the following advantages:

one is that it can fill up quickly. The charger circuit only needs to select R with proper resistance value ₅₃ 、R ₅₄ 、R ₅₅ I.e. to control the charging current profile of the charged battery pack as shown in fig. 8. In fig. 8, curve 81 is a charging curve of a secondary battery, and curve 82 is a charging curve of a primary general zinc-manganese dry battery. Taking charging of the secondary battery as an example, from the start of charging to t ₁ The curves in time such as a section a and a section b have large charging current, and the battery is charged quickly to t ₁ The capacity can be fully increased by about 85 percent. t is t ₁ Then to t ₂ Due to controlTriode V ₅₁₀ So that the charging current rapidly decreases as shown in the b and c sections of the curve 1 to t ₂ When the battery is close to being sufficient, then t ₂ To t ₃ In the period of time, the charging current gradually decreases to a safe current value, and the battery is sufficient at the moment.

And secondly, the safety performance is good. It is characterized by that on one hand it is safe for charged battery, and can not charge bad battery. When the battery is fully charged, the curve 81 shown in fig. 8 enters a section after d, and the charged battery has dropped to a safe current, and the battery is not broken and is not damaged after a long time. And on the other hand, personal safety. Because the charging power supply box is internally provided with S in figure 4 ₂ A two-pole push-button switch is shown and the battery source cartridge circuit control compartment is sealed. When the charger is switched on and switched off, the battery in the charging power box can be taken out or put in, and the electric shock can not occur. Because the button switch S is only needed to be opened when the charging power supply box cover is opened ₂ It automatically disconnects and cuts off the electrical connection between the battery compartment and the charger.

And thirdly, the operation is simple. When the charger charges the charging power supply, the charging power supply box cover is closed as long as the 220V alternating current power supply is connected, and the circuit S shown in the circuit of fig. 4 is ₁ Set at the position 2, connected by a small two-wire plug connecting wire (shown in FIG. 6) between the two, and observe the charging display indicator lamp (the luminous tube V shown in FIG. 5) ₅₁₂ ) The normal light emission indicates that the normal charge state is entered. When another indicator light (luminous tube V in figure 5) ₅₁₃ ) When bright, it indicates that the battery is sufficient. The charging time does not need to be calculated before charging, and the battery is not worried about being damaged after being sufficient, so the use is very convenient.

The volume is small, the weight is light, the structure is simple, the work is reliable, and the cost is low. Because the charger adopts the capacitor for voltage reduction, the volume is smaller and the weight is lighter than that of the charger adopting the transformer for voltage reduction. The whole circuit only uses 20 discrete electronic components and has no wearing parts.

Description of the drawings:

figure 1 charging power supply box

1-box bottom circuit control bin 2-box bottom battery bin 3-power supply box cover 4-circuit control bin cover 5-button hole 6-output socket 7-button switch 8-input small two-wire socket 9-single-pole double-set switch

Fig. 2 is the simplest charge control circuit

E-battery R ₁ Control resistance Z, F output socket

FIG. 3 is a connection line between a power supply box and a mobile phone

31-double-wire 32-power box plug 33-mobile phone plug

FIG. 4 is a schematic diagram of an automatic current-limiting protection control circuit

E-battery R ₄₁ 、R ₄₂ 、R ₄₃ 、R ₄₄ 、R ₄₅ Resistance V ₁ -a tertiary duct V ₂ Light-emitting diodes S ₁ Single pole double switch S ₂ Double-pole double-set push-button switch Z, F-positive and negative output terminal D ₁ 、O ₁ Positive and negative input terminal

FIG. 5 charger circuit

A. B-AC input end D, O-DC output end C ₁ 、C ₂ -capacitance

R ₅₁ 、R ₅₂ 、R ₅₃ 、R ₅₄ 、R ₅₅ 、R ₅₆ 、R ₅₇ -resistance S-double pole double position switch

V ₅₁ 、V ₅₂ 、V ₅₃ 、V ₅₄ 、V ₅₅ 、V ₅₆ 、V ₅₇ 、V ₅₈ 、V ₅₉ -rectifying diodePipe V ₅₁₀ -control transistor

V ₅₁₁ -a zener diode V ₅₁₂ 、V ₅₁₃ Light-emitting diodes Z ₅ 、F ₅ -positive and negative poles of output terminal of step-down rectifier circuit

Figure 6 small two-wire plug connecting line

61-plug 62-positioning notch 63-metal tube 64-lead 65-fixing screw hole

Figure 7 small two-wire socket

71-positioning lug 72-fixing screw hole 73-metal column

FIG. 8 charging current curve

81-accumulator curve 82-common dry cell curve

Detailed Description

The invention is further illustrated with reference to the following examples with reference to the accompanying drawings.

An example of charging a mobile phone with a general alkaline No. 5 dry battery will be given.

Considering that most of lithium ion batteries or nickel-metal hydride batteries of 3.6V used in current mobile phones are 3.6V and 900mah nickel-metal hydride batteries, taking the simplest control circuit shown in fig. 2 as an example, 4 new alkaline universal dry batteries No. 5 are selected to be used in series, the voltage of each new battery is generally about 1.6V, the internal resistance is about 0.35 Ω, the total voltage of 4 batteries after series connection is 1.6V × 4=6.4V, the total internal resistance is 0.35 Ω × 4=1.4 Ω, the battery in the mobile phone is formed by connecting 3 unit batteries in series, after discharging, the voltage of each unit battery is about 1.1V, the internal resistance is about 0.5 Ω, the total voltage of the mobile phone battery is about 1V × 3=3.3V, the internal resistance is about 0.5 Ω × 3.5 Ω, and the selection resistor R = ₁ 1.5 omega, and considering the connection line and various contact electricityThe resistance is set to 0.3 Ω, the current at the beginning of charging should be (total voltage of charging source-total voltage of mobile phone battery) ÷ (total resistance of charging source + total resistance of mobile phone battery + contact resistance + R) ₁ ) The current can be borne by the mobile phone battery by = (6.4-3.3) ÷ (1.4 +1.5+0.3+ 1.5) =3.1 ÷ 4.7=0.66 (a), namely 660 milliamperes, and certainly, after charging starts, the charging current can be reduced to about 500mA in 1-2 minutes because the voltage of the mobile phone battery rises and the voltage of the charging power supply battery drops quickly at the beginning. Experiments show that the mobile phone battery can be fully charged in more than 3 hours (the charging time of the battery with small capacity is shorter). When the battery of the mobile phone is sufficient, the protection circuit in the mobile phone is started, the charging current jumps in a small range, and the battery in the mobile phone cannot be damaged. The mobile phone is not provided with a protection circuit, the voltage of the charging power supply can be further reduced along with the continuous charging, the internal resistance can be further increased, the charging current can be smaller and smaller, and the mobile phone battery cannot be damaged by the charging.

If a nickel-metal hydride battery or a totally-enclosed maintenance-free lead-acid storage battery is used as a charging power supply battery, R with a proper resistance value can be selected by calculation according to the same method ₁ . If a circuit as shown in FIG. 4 is used, then R is reduced appropriately ₁ The resistance value will not be described in detail here.

An example of a charger that can charge the nickel-hydrogen dry cell battery and the ordinary alkaline dry cell battery as shown in fig. 5 will be described.

In the circuit shown in FIG. 5, select C ₁ 、C ₂ 4.4 muF, 400V capacitance; v ₅₁₀ A 2A,20W triode; v ₅₁ -V ₅₉ Is a 1A,1000V rectifier diode; v ₅₁₁ Is a 8V,2W stabilivolt; v ₅₁₂ 、V ₅₁₃ Is a light emitting diode; r is ₅₁ The resistance is 500K omega and 1/4W; r ₅₂ The resistance is 200 omega and 1/8W; r ₅₆ Is 0.2 omega, 1/8W resistance; r is ₅₇ 3.3 omega, 2W resistance; r ₅₃ The resistance is 330 omega and 1/8W; r ₅₄ 、R ₅₅ Determining resistance by calculation and debuggingA value; s is a double-pole double-set switch, and is arranged at the position shown in figure 5 when charging the nickel-metal hydride battery, and is arranged at the other position when charging the common alkaline battery, so that C is arranged ₂ Opening, R ₅₅ And R ₅₄ And are joined together.

Under the condition of the parameters of the elements, the charging power supply battery pack formed by connecting 4 No. 5 nickel-hydrogen batteries of 1300mAh in series is charged, the charging current can reach more than 500mA at the beginning, the charging can be continued for about 2 hours, the batteries are charged with about 85% of capacity and then gradually reduced, and the batteries are fully charged after about 4 hours. At this time, the charging current is reduced to about 30mA, and the battery is safe. When a charging power supply battery pack consisting of 4 No. 5 alkaline zinc-manganese dry batteries connected in series is charged, S is placed at a corresponding position, the charging current at the beginning is about 250mA, and then gradually decreases, when the total voltage of the charging battery pack reaches about 7V (about more than 10 hours), the charging current decreases to about 10mA, and the current is safe for a fully charged ordinary alkaline battery, and cannot be damaged after a long time.

Claims

1. A system device capable of charging mobile phone is mainly composed of a charging power supply and a charger for charging the charging power supply, wherein a shell power supply box of the charging power supply is composed of a box bottom (1, 2) and a box cover (3), the box bottom is internally divided into a circuit control bin (1) and a battery bin (2), the system device is characterized in that a control circuit is arranged in the circuit control bin, Z and F are respectively the positive and negative poles of the output end of the control circuit, when the mobile phone is charged, the Z and F two poles are respectively communicated with the positive and negative poles of a mobile phone battery through a connecting line between the power supply box and the mobile phone, a circuit device of the charger is arranged in a shell, and the system device is characterized in that the circuit is composed of five parts of voltage reduction rectification, voltage limitation protection, charging current control, charging display and sufficient display circuit, the front end of a voltage reduction rectification circuit and 220V alternating current voltage alternating currentThe sources (A, B) are connected, the output (Z) of the latter ₅ 、F ₅ ) Is connected with voltage limiting protection, charging current control, charging display and sufficient display circuit, and finally is outputted from two ends of D and O, D is positive pole and O is negative pole, and when charging, two ends of D and O are respectively connected with positive pole and negative pole D of input end of charging power supply by means of small two-wire plug connection line ₁ 、O ₁ Two ends are connected.

2. The charging power supply control circuit in the system device for charging mobile phone according to claim 1, wherein a control protection resistor R is connected ₁ 。

3. The charging power control circuit of claim 1, wherein the transistor V is used to control the charging power of the mobile phone ₁ Resistance R ₄₁ 、R ₄₂ 、R ₄₃ 、R ₄₄ To form an over-current protection circuit.

4. The charger of claim 1, wherein the transistor V is connected to the output of the charge pump ₅₁₀ And a resistor R ₅₃ 、R ₅₄ 、R ₅₅ 、R ₅₇ And a charging current control circuit consisting of a switch S.

5. Charger according to claim 4, characterised by the fact that it is a voltage regulator tube V ₅₁₁ Forming a voltage limiting protection circuit.

6. Charger according to claim 4, characterised in that it is constituted by a rectifying diode V ₅₅ 、V ₅₆ 、V ₅₇ Resistance R ₅₂ Arc tube V ₅₁₂ Forming a charging display circuit.

7. Charger according to claim 4, characterised in that the current is rectifiedDiode V ₅₈ 、V ₅₉ Arc tube V ₅₁₃ Resistance R ₅₆ Make up a sufficient display circuit.

8. A charger according to claim 4, characterised in that a changeover switch S is connected in the circuit to adapt to the charging of the batteries of the primary and secondary different types.