CN2407456Y

CN2407456Y - Transistor charger for batteries

Info

Publication number: CN2407456Y
Application number: CN 99255592
Authority: CN
Inventors: 张超仁; 张越仁; 李文坦
Original assignee: 张超仁
Priority date: 1999-12-08
Filing date: 1999-12-08
Publication date: 2000-11-22
Anticipated expiration: 2009-12-08

Abstract

The utility model relates to a battery charger with a transistor, which is provided with a machine enclosure. A power cord is arranged on a rear panel of the machine enclosure; a power switch, an ammeter, a current regulating knob, a changeover switch, a voltmeter and an output terminal are arranged on a front panel of the machine enclosure, wherein, the top surface of the machine enclosure is provided with an instrument fan. A circuit part is arranged in the machine enclosure, and the circuit part is mainly composed of an electric network filter, an input rectifier, a regulating circuit of charging current, an over-current protection circuit, an inverter and an output rectifier. The inversion technique is used by the utility model for changing alternate-current electricity of 220V into direct-current voltage to charge a battery. The utility model has no power-frequency transformer and has the advantages of small size, light weight, high efficiency and little energy consumption.

Description

The transistor battery charger

The utility model transistor battery charger is to relate to a kind of inversion transformation technique that utilizes to produce power supply, is the device of charge in batteries, belongs to the electrical equipment charge prepd.

At present, China utilizes inversion transformation technique to produce DC power supply, is charge in batteries, existing certain development, for example, " Sichuan electronics newspaper " 98 year 45 phase, by name " the new-style electronic charger " of publication is exactly an example, but since technical costs and electronic component limit, power can not be done very greatly, more difficult is the charge in batteries of automobile and so on, its charge prepd is limited to, and the element versatility is poor, the cost height, unfavorable penetration and promotion.

The purpose of this utility model is: utilize common power transistor as Switching Power Supply, inside is provided with overcurrent protection, and charging current such as regulates continuously at circuit, and the power of output 500W is the charge in batteries below the 195Ah.

A kind of transistor battery charger of the utility model, it has a casing 9, on the rear board of casing 9, lead to the power line 1 that connects the 220V power supply, on the front panel of casing 9, be provided with mains switch 2, ammeter 3, current adjusting knob 4,12-24V change over switch 5, voltmeter 8 and lead-out terminal 7, this lead-out terminal 7 connects storage battery 10, can be storage battery 10 charging, instrument fan 6 is housed at the end face of casing 9; In casing 9 circuit board is housed, circuit board is provided with circuit, and this circuit mainly includes: line filter 11, input rectifier 12, charging current are adjusted circuit 13, current foldback circuit 14, inverter 15 and output rectifier 16; Its annexation is:

This line filter 11 is made of capacitor C 1, C2 high frequency transformer loop L1, and the input of this line filter 11 is connected the 220V power supply by protective tube FZ1 with switch S 1, and its output connects input rectifier 12;

This input rectifier 12 mainly is made of bridge rectifier DB1, and its input connects line filter 11, and output connects charging current and adjusts the input of circuit 13 and the input of inverter 15;

This charging current is adjusted circuit 13, mainly connect to form by transistor T 1, variable controllable silicon SCR1, resistance R 1, R2, R3, R4, R5, capacitor C 4, potentiometer W1 and diode D1, the output that this charging current is adjusted circuit 13 connects the output of input rectifier 12 and the input of inverter 15, and it is its power supply by bridge rectifier DB2 that this charging current is adjusted circuit 13;

This current foldback circuit 14, mainly be interconnected to constitute at the L2 in the high frequency transformer loop and B1, diode D6, voltage-stabiliser tube ZD, resistance R 7, R8, R9, R10, potentiometer W2, unidirectional controllable silicon S CR2, photoelectricity combined device IC1, bidirectional triode thyristor SCR3 and the reverse winding on the vibration bead B1 etc. by string, its output is connected with inverter 15;

This inverter 15, mainly constitute by transistor T 2, T3, resistance R 6, capacitor C 6, C7, C8, diode D2, D4, D5, diac D3, oscillation transformer B1, output transformer B2 etc., its input connects the output of input rectifier 12 and the output that charging current is adjusted circuit, its output connects the input of output rectifier 16, and this inverter 15 also interconnects with current foldback circuit 14;

This output rectifier 16 is to be made of bridge rectifier DB3, and its input connects inverter 15 by switch S 2, and output connects transformer 10.

A kind of transistor battery charger of the utility model, its advantage is: owing to cancelled Industrial Frequency Transformer, so its volume is little, and is in light weight, efficient height (being operated in 25KHZ), adopt the universal power transistor to make inverter, so its versatility and interchangeability are very strong, be convenient to maintenance, there is not complicated drive circuit, cost is low, easily promotes, popularizes.

The utlity model has following description of drawings.

Fig. 1 the utility model electrical equipment functional-block diagram

Fig. 2 the utility model is used in combination schematic diagram

Fig. 3 the utility model circuit theory diagrams

Number in the figure is as follows:

1. power line 2. switches 3. ammeters

4. Current Regulation turn-knob 5. switches 6. instrument fans

7. lead-out terminal 8. voltmeters 9. casings

10. storage battery 11. line filters 12. input rectifiers

13. charging current is adjusted circuit 14. current foldback circuits 15. inverters

16. output rectifier

Electric elements have:

Resistance R 1-R10, capacitor C 1-C9, bridge rectifier DB1-DB3, controllable silicon SCR 1-SCR3, diode D1-D8, switch S 1, S2, potentiometer W1, W2, protective tube FZ1, FZ2, transistor T 1-T4.

Be described in detail as follows for an embodiment below in conjunction with accompanying drawing:

A kind of transistor battery charger of the utility model, it has a casing 9, on the rear board of casing 9, lead to the power line 1 that connects the 220V power supply, on the front panel of casing 9, be provided with mains switch 2, ammeter 3, current adjusting knob 4,12-24V change over switch 5, voltmeter 8 and lead-out terminal 7, this lead-out terminal 7 connects storage battery 10, can be storage battery 10 charging, instrument fan 6 is housed, in casing 9, be equipped with and have circuit circuit board partly at the end face of casing 9; This circuit partly mainly by: electrical network ripple device 11, input rectifier 12, charging current are adjusted circuit 13, current foldback circuit 14, inverter 15 and output rectifier 16 and are formed;

Alternating current 220V is by line filter 11, input rectifier 12, become the 200-300V direct current after the rectification, this direct current is supplied with inverter 15, as its operating voltage, transistor T 2, T3, resistance R 6, capacitor C 6, C7, C8, diode D2, diac D3, oscillation transformer B1, output transformer B2 constitutes inverter 15.Because transistor T 2, the alternate conduction of T3 two pipes and ending, make the secondary induction of high-frequency output transformer B2 go out the voltage of similar sine wave, become the dither direct current through the quick bridge rectifier DB3 of Schottky full-bridge rectification, charge power supply as storage battery, switch S 2 is the 12-24V change over switch, by changing the secondary number of turn of high frequency transformer, thereby satisfy needs to 12V and 24V charge in batteries, unijunction transistor T1, resistance R 1, R2, R3, R4, R5, potentiometer W1, capacitor C 4, controllable silicon SCR 1, diode D1 constitutes charging current and adjusts circuit 13.Because the relaxation oscillator that transistor T 1 is formed, as long as change the angle of flow of potentiometer W1 with regard to variable controllable silicon SCR1, thereby the input amount of the capacitor C 5 of string on the controllable silicon loop is just changed, controllable silicon SCR 1 is from by the end of conducting, and the direct voltage after bridge rectifier DB1 rectification just rises to 300V by 200V.The secondary voltage of high frequency transformer just rises to the needs that 18V (or 24V rises to 36V) satisfies the battery current adjustment fully by 12V like this.

By the L2 of string in the high frequency transformer loop and B1 diode D6, voltage stabilizing didoe ZD, resistance R 7 R8 R9, R10, potentiometer W2; unidirectional controllable silicon S CR2 photoelectrical coupler IC1, bidirectional triode thyristor SCR3; reverse winding with on vibration bead B1 has constituted current foldback circuit 14.

Its principle is: when overcurrent appears in load circuit; main oscillations transistor T 2; T3; the output loop electric current just increases; when being increased to certain value; the voltage of the L2 induction in the high frequency transformer loop is by fast diode D7 rectification; as surpassing the threshold voltage 4.5V of voltage-stabiliser tube ZD; until making transistor T 4 conductings, controllable silicon SCR 2 conductings simultaneously are after controllable silicon SCR 2 conductings; the inner infrared diode of photoelectrical coupler IC1 gets; and phototriode conducting in making, at this moment bidirectional triode thyristor SCR3 trigger electrode gets electric and conducting, and two winding directions of vibration bead B1 are opposite; when feeding equidirectional electric current simultaneously; the flow direction that produces in magnetic core is opposite, cancels each other, and making the B1 inductance is zero; two oscillistor T2; the T3 base drive; loss of voltage, the entire circuit vibration is closed, and has finished all processes of overcurrent protection; as powered-down; get rid of external fault, restart, complete machine works on again.

This transistor battery charger miniature instrument fan 6 ventilation and heat.

Claims

1, a kind of transistor battery charger, it is characterized in that: this charger has a casing (9), on the rear board of casing (9), draw the power line (1) that connects the 220V power supply, front panel is provided with mains switch (2), ammeter (3), current adjusting knob (4), switch (5), voltmeter (8) and lead-out terminal (7), this lead-out terminal (7) connects storage battery (10), and end face is equipped with instrument fan (6); Be provided with circuit partly in casing (9), this circuit partly mainly includes: line filter (11), input rectifier (12), charging current are adjusted circuit (13), current foldback circuit (14), inverter (15) and output rectifier (16); Its annexation is:

This line filter (11) mainly is made of capacitor C 1, C2 high frequency transformer loop L1, and its input is connected the 220V power supply by protective tube FZ1 with switch S 1, and its output connects input rectifier (12);

This input rectifier (12) mainly is made of bridge rectifier DB1, and its input connects line filter (11), and output connects charging current and adjusts the input of circuit (13) and the input of inverter (15);

This charging current is adjusted circuit (13), mainly connect to form by transistor T 1, variable controllable silicon SCR1, resistance R 1, R2, R3, R4, R5, capacitor C 4, potentiometer W1 and diode D1, its output connects the output of input rectifier (12) and the input of inverter (15), and this bridge rectifier DB2 is connected power supply with it;

This current foldback circuit (14), mainly be interconnected to constitute at the L2 in the high frequency transformer loop and B1, diode D6, voltage-stabiliser tube ZD, resistance R 7, R8, R9, R10, potentiometer W2, unidirectional controllable silicon S CR2, photoelectricity combined device IC1, bidirectional triode thyristor SCR3 and the reverse winding on the vibration bead B1 etc. by string, its output is connected with inverter (15);

This inverter (15), mainly constitute by transistor T 2, T3, resistance R 6, capacitor C 6, C7, C8, diode D2, D4, D5, diac D3, oscillation transformer B1, output transformer B2 etc., its input connects the output of input rectifier (12) and the output that charging current is adjusted circuit (13), its output connects the input of output rectifier (16), and this inverter (15) also interconnects with current foldback circuit (14);

This output rectifier (16) is to be made of bridge rectifier DB3, and its input connects inverter (15) by switch S 2, and output connects transformer (10).