CN102593931A

CN102593931A - Two-level constant-current charging device

Info

Publication number: CN102593931A
Application number: CN2012100733681A
Authority: CN
Inventors: 刘昭利
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-19
Filing date: 2012-03-19
Publication date: 2012-07-18

Abstract

The invention relates to a two-level constant-current charging device, which consists of a 220V alternative-current power supply, a transformer B, a full-bridge rectifying and filter circuit, a constant-current source circuit and a fast or a slow charging selection circuit, a charging status indication circuit and a constant-current charging output terminal. A constant-current source is formed by an integrated voltage regulation block (LM317T) with three ends being adjustable, so that an outputted constant current numeric value is accurate, and the charging time is greatly convenient to control during the charging process of a charging battery; a charging output port is fearless to the short-circuit and is particularly suitable for the extensive use; one selective switch SW is arranged in a circuit of the charging device, so that the charging current is divided into two levels; the charging device has a repair effect on the charging battery with reduced performance or with poor performance; and after two silicon rectification diodes are respectively serially connected into a charging output circuit, and one luminous diode is bridged over two ends of each silicon rectification diodes, the indication problem of the charging battery at the charging status can be solved.

Description

Two grades of constant current charge devices

Technical field

The invention belongs to the battery boosting technology field, relate to a kind of two grades of constant current charge devices.

Background technology

The charger that is used for rechargeable battery is of a great variety; The charger common technology has modes such as unsteady flow level pressure, variable voltage and variable current, pulsed, constant current level pressure; Charging to NI-G or Ni-MH battery has strict demand; But mostly the charger of selling on the market is to manufacture in a rough and slipshod way, and does not reach the constant current charge specification requirement of rechargeable battery at all.Through several kinds of chargers on the analysis market, its circuit mostly is the wattage transformer with a 6～9V, carries out after the halfwave rectifier with a diode, with a resistance current-limiting charge.Have on current-limiting resistance and connect a light-emitting diode and carry out charged state indication; Charging current is many not to be waited at 20～70mA; And charging current is pulse current, and the size of charging current also can receive line voltage and the influence of rechargeable battery state, constant current charge far from; If rechargeable battery uses the simple charger charging for a long time, the life-span of rechargeable battery will shorten dramatically.

Because of two grades of constant current charge devices of the present invention are to form constant-current source with three end adjustable voltage-regulating ic pieces (LM317T); Make that the constant current numerical value of exporting is accurate and charging current is invariable; So rechargeable battery in charging process, greatly facilitates the control to the charging interval;

This charger charging output port is not afraid of short circuit, and this protection merit is particularly suitable for extensive use;

1 single-pole single-throw(SPST selector switch SW is set in the circuit of this charger, makes charging current become two grades;

This charger has the certain repairing effect to performance " early ageing " or the low rechargeable battery of performance;

With the pressure drop of 2 silicon rectifier diode series connection generation >=1.4V, for light-emitting diode provides operating voltage.In the charging output loop, connect respectively earlier behind 2 silicon rectifier diodes, the mode at 1 light-emitting diode of across of 2 silicon rectifier diodes has solved the indication problem of rechargeable battery in charged state.

Below specify two grades of constant current charge devices of the present invention related relevant technologies content in implementation process.

Summary of the invention

Goal of the invention and beneficial effect: two grades of constant current charge devices of the present invention are formed constant-current source with three end adjustable voltage-regulating ic pieces (LM317T); Make that the constant current numerical value of exporting is accurate and charging current is invariable; So rechargeable battery in charging process, greatly facilitates the control to the charging interval; The charging output port is not afraid of short circuit, and this defencive function is particularly suitable for extensive use; 1 single-pole single-throw(SPST selector switch SW is set in the circuit of charger, makes charging current become two grades; This charger has the certain repairing effect to performance " early ageing " or the low rechargeable battery of performance; After 2 silicon rectifier diodes were connected in charging in the output loop respectively, the mode at 1 light-emitting diode of across of 2 silicon rectifier diodes had solved the indication problem of rechargeable battery in charged state.

The circuit working principle: core devices of the present invention is connected into a constant-current source with the adjustable integrated package of pressure-stabilizing LM317T of three ends.LM317T is under enough direct voltage situation; Can keep output to exceed 1.25V than its adjustment end ADJ voltage, adjustment end ADJ directly be recharged the pond and link to each other, but the internal resistance of adjustment end ADJ very big (adjustment holds the electric current of ADJ can not surpass 50 μ A under the normal condition); Can be similar to and regard open circuit as; But it can be taken a sample to direct voltage, and LM317T brings up to the high 1.25V than adjustment end ADJ with the voltage of output, and being connected across so on the resistance of output and ADJ end will have the electric current of 1.25V/26 Ω=50mA to flow through (when selecting the switch SW disconnection; Resistance R 1 is 26 Ω), this electric current just carries out constant current charge to rechargeable battery;

According to the technical parameter that embodiment gave, when selector switch SW broke off, charging current was about 50mA; Selector switch SW is about 155mA when closed; Be connected on the next size that can change charging current of resistance of output with the adjustment end ADJ of LM317T through change.

Technical scheme: two grades of constant current charge devices; It is made up of 220V AC power, transformer B, full-bridge rectification and filter circuit, constant-current source circuit and charge fast or at a slow speed selection circuit, charged state indicating circuit and constant current charge lead-out terminal, and its characteristic comprises:

The constant-current source circuit and the selection circuit that charges fast or at a slow speed: form by the adjustable integrated package of pressure-stabilizing IC1 of three ends, resistance R 1, resistance R 2 and selector switch SW; The cathode output end of the 3rd pin input termination full-bridge rectification of three ends are adjustable integrated package of pressure-stabilizing IC1; The end of the 2nd pin output connecting resistance R1 of three ends are adjustable integrated package of pressure-stabilizing IC1 and an end of resistance R 2; The 1st pin adjustment end (ADJ) of the adjustable integrated package of pressure-stabilizing IC1 of another termination three ends of resistance R 1; An end of switch SW is selected in the other end selecting of resistance R 2, the 1st pin adjustment end (ADJ) of the adjustable integrated package of pressure-stabilizing IC1 of another termination three ends of selector switch SW;

Charged state indicating circuit: form by silicon rectifier diode D5, silicon rectifier diode D6 and LED; The positive pole of LED connects the positive pole of silicon rectifier diode D5 and the 1st pin adjustment end (ADJ) of the adjustable integrated package of pressure-stabilizing IC1 of three ends; Silicon rectifier diode D5 negative pole links to each other with the positive pole of silicon rectifier diode D6, and the negative pole of LED connects the negative pole of silicon rectifier diode D6;

The constant current charge lead-out terminal: positive terminal of rechargeable battery links to each other with the negative pole of the negative pole of silicon rectifier diode D6 and LED, and negative terminals of rechargeable battery links to each other with the cathode output end of full-bridge rectification and circuit ground GND.

Description of drawings

Accompanying drawing 1 is two grades of circuit working schematic diagrams that the constant current charge device is used in an embodiment; Switch SW is charging option switch at a slow speed soon.

Embodiment

Below in conjunction with accompanying drawing 1 and description of drawings, and implement to realize the present invention according to components and parts subordinate list and following specification requirement.

Components and parts title and important technological parameters

Element number	The components and parts title	Leading indicator	Quantity	Remarks
					IC1	LM317T or LM338	TO-220 or TO-3 encapsulation	1	Positive polarity output
D1～D6	1N4001 (silicon rectifier diode)	1A/50V	6	Or select 1N4002
					LED	Red light emitting diodes	￠5	1
C1	Electrochemical capacitor	2200μF/25V	1	Vertical
					R1	Metalfilmresistor	26Ω/1W	1
R2	Metalfilmresistor	11Ω/1W	1

Circuit production main points and circuit debugging

Three end adjustable voltage-regulating ic pieces: the LM338 that must select anodal output plastic packaging LM317T or metallic packaging for use;

Heat abstractor: three end adjustable voltage-regulating ic pieces (LM317T) should install the radiator of appropriate size additional;

If select the LM338 of metallic packaging for use, because of the operating current I need not install radiator additional;

Constant current value adjustment: can be respectively on the next door of resistance R 1 or resistance R 2 and the resistance that to connect 1 resistance be 39～51 Ω, reach requirement with constant current value and be as the criterion.

Technical indicator

Rechargeable battery joint number: can be 1～4 joint NI-G or nickel-hydrogen chargeable cell and carry out constant current charge;

Charging current: two grades of speeds are arranged, and quick charge shelves charging current is 155mA; Selecting for use at a slow speed, charging current is 60mA.

Method for using

The battery of the older or poor-performing of rechargeable battery, the charging interval should be selected long;

Suddenly do not wait under the situation of usefulness at rechargeable battery, should select the little current system charging of slow shelves to help to fill rechargeable battery full, and rechargeable battery is difficult for heating, can damage rechargeable battery;

Before indoor charging, remember remaining electric weight for eliminating rechargeable battery, should carry out the standard discharge on request, when discharging current was 300mA, the final voltage of rechargeable battery bringing onto load discharge was 0.85～0.90V;

When charging at a slow speed, every joint rechargeable battery control voltage is 1.58V (charger not design is full of automatic stopping circuit, and the most handy digital voltmeter is kept watch on during use, damages rechargeable battery to prevent overcharge);

Be 4 joints or following the rechargeable battery of 4 joints when charging, because of the voltage difference at three end adjustable voltage-regulating ic piece two ends will produce more heat more greatly, so will pay special attention to the ventilation and the heat radiation of charger.

Claims

1. two grades of constant current charge devices, it by 220V AC power, transformer B, full-bridge rectification and filter circuit, constant-current source circuit and fast or at a slow speed charging select circuit, charged state indicating circuit and constant current charge lead-out terminal to form, its characteristic comprises:

The constant-current source circuit and the selection circuit that charges fast or at a slow speed are made up of the adjustable integrated package of pressure-stabilizing IC1 of three ends, resistance R 1, resistance R 2 and selector switch SW; The cathode output end of the 3rd pin input termination full-bridge rectification of three ends are adjustable integrated package of pressure-stabilizing IC1; The end of the 2nd pin output connecting resistance R1 of three ends are adjustable integrated package of pressure-stabilizing IC1 and an end of resistance R 2; The 1st pin adjustment end (ADJ) of the adjustable integrated package of pressure-stabilizing IC1 of another termination three ends of resistance R 1; An end of switch SW is selected in the other end selecting of resistance R 2, the 1st pin adjustment end (ADJ) of the adjustable integrated package of pressure-stabilizing IC1 of another termination three ends of selector switch SW;

The charged state indicating circuit is made up of silicon rectifier diode D5, silicon rectifier diode D6 and LED; The positive pole of LED connects the positive pole of silicon rectifier diode D5 and the 1st pin adjustment end (ADJ) of the adjustable integrated package of pressure-stabilizing IC1 of three ends; Silicon rectifier diode D5 negative pole links to each other with the positive pole of silicon rectifier diode D6, and the negative pole of LED connects the negative pole of silicon rectifier diode D6;

The constant current charge lead-out terminal is that positive terminal of rechargeable battery links to each other with the negative pole of silicon rectifier diode D6 and the negative pole of LED, and negative terminals of rechargeable battery links to each other with the cathode output end of full-bridge rectification and circuit ground GND.