CN202749888U

CN202749888U - Automatic charging stopping device for LED flashlight

Info

Publication number: CN202749888U
Application number: CN 201220466730
Authority: CN
Inventors: 黄勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-09-13
Filing date: 2012-09-13
Publication date: 2013-02-20
Anticipated expiration: 2022-09-13

Abstract

Provided by the utility model is an automatic charging stopping device for an LED flashlight. The automatic charging stopping device comprises a 220-V alternating current unit, a resistance-capacitance reduction voltage circuit, a full-bridge rectification circuit, a voltage detection circuit and trigger circuit, a zero-crossing detection circuit, a charging control circuit and storage battery discharging prevention circuit, a charging state indication circuit and a storage battery set. The rechargeable LED charging flashlight that is widely used currently mostly employs a simple capacitance step-down type charging mode and defects of high voltage, heavy impact current and incapability of automatic stopping of charging and the like exist; and because the charging can not be controlled easily, overcharging of the storage batter occurs frequently, so that the electrolyte in the storage battery is dried early and thus the storage battery dose not work. According to the utility model, the voltage detection circuit, the zero-crossing detection circuit and the unidirectional silicon-controlled circuit and the like are utilized, thereby overcoming the defects of heavy impact currents due to the capacitance step-down type charging mode and easiness of element damage and the like. Moreover, functions of automatic charging stopping after the charging completion and trickle charging can be realized due to the utilization of the circuits; and the device has advantages of good circuit reliability, low manufacturing cost and high practicability and the like.

Description

LED flashlight charging automatic stop arrangement

Technical field

The utility model belongs to electronics and accumulator charging technology field, is about a kind of LED flashlight charging automatic stop arrangement.

Background technology

Now widely used chargeable LED chargeable flashlight mostly adopts simple capacitor step-down charging modes, it exists, and voltage is high, impulse current is large and charging can not automatic stop etc. defective.Owing to charged state is difficult for holding, very easily cause batteries to overcharge or undercharge, make the electrolyte in the storage battery dry up too early and die young.

The utility model adopts the circuit such as voltage detecting, zero cross fired and one-way SCR control, has overcome the shortcomings such as capacitance decompression charging impulse current is large, fragile element.Circuit of the present utility model can be realized being full of automatic stop and trickle charge function, has the advantages such as circuit reliability is good, cost of manufacture is low, practical.

Below describe LED flashlight charging automatic stop arrangement described in the utility model related correlation technique content in implementation process in detail.

The utility model content

Goal of the invention and beneficial effect: present widely used chargeable LED chargeable flashlight, mostly adopt simple capacitor step-down charging modes, have that voltage is high, impulse current large and charging can not automatic stop etc. defective.Because charging be difficult for to be held, and very easily causes batteries to overcharge, make electrolyte in the storage battery cross drought dry and die young.

The utility model adopts the circuit such as voltage detecting, zero cross fired and one-way SCR control, has overcome the shortcomings such as capacitance decompression charging impulse current is large, fragile element.Circuit of the present utility model can be realized being full of automatic stop and trickle charge function, has the advantages such as circuit reliability is good, cost of manufacture is low, practical.Avoided storage battery excessively drought die young, prolonged the useful life of storage battery, reduced the wasting of resources and lead contamination.

The operation principle of circuit: increased on the basis of typical circuit by NPN transistor VT1 form voltage detecting circuit, NPN transistor VT2 forms zero cross detection circuit, utilize unidirectional controllable silicon S CR as electronic switch, be used for the through and off of control charging circuit.Wherein, LED is charging indicator light, and voltage stabilizing didoe DW is as voltage detecting, and isolating diode D1 is used for batteries and isolates with circuit, prevents that the circuit batteries from slowly discharging by circuit.

Charge normal: when accumulator battery voltage is lower than the 4.4V setting voltage (most of LED flashlights adopt 2 joint storage battery power supplies, therefore end of charge voltage is set as 4.4V), voltage stabilizing didoe DW cut-off this moment, NPN transistor VT1 is because ending without base bias.Start-up portion after 220V alternating current zero passage, zero passage detection NPN transistor VT2 ends because base bias is low; Because the bias voltage of resistance R 5, unidirectional controllable silicon S CR obtains trigger voltage and conducting, and the accumulators group charges normal.

Be full of automatic stop: when charging voltage rises to setting voltage 4.4V, voltage stabilizing didoe DW conducting, NPN transistor VT1 conducting, the control electrode potential of unidirectional controllable silicon S CR is pulled down to 0V, unidirectional controllable silicon S CR ends because of triggerless voltage, turn-off charging circuit, realized being full of automatic stop.Certainly, in actual use, batteries leave standstill one after the meeting voltage can descend to some extent, so unidirectional controllable silicon S CR again can conducting (if this moment the alternating voltage instantaneous value more than 200V, have the great impact electric current, just because of the zero cross fired that is comprised of NPN transistor VT2 has just been avoided heavy impulse current), voltage can turn-off again after rising to setting.Go round and begin again like this, the charging indicator light flicker, the expression batteries approaches and is full of.Along with the continuation of accumulator battery voltage is risen, ON time shortens, and the indicator light flicker is slack-off, approaches at last and extinguishes, and expression is full of.The charging modes of pulsing this intermittence more is conducive to the storage battery abundance and prolongs the useful life of storage battery.

Technical scheme: LED flashlight charging automatic stop arrangement, it is by the 220V alternating current, capacitance-resistance voltage reduction circuit, full bridge rectifier, voltage detecting circuit and circuits for triggering, zero cross detection circuit, charging control circuit and electricity storage preventing tank discharge circuit, charged state indicating circuit and batteries consist of, and its feature comprises:

Voltage detecting circuit and circuits for triggering: formed by voltage stabilizing didoe DW, resistance R 3, electrochemical capacitor C2, resistance R 4, NPN transistor VT1 and resistance R 5, the negative pole of voltage stabilizing didoe DW connects the positive pole of electrochemical capacitor C2 and the positive pole of batteries by resistance R 3, the positive pole of voltage stabilizing didoe DW connects an end of base stage and the resistance R 4 of NPN transistor VT1, the emitter connection circuit ground GND of the other end of the negative pole of electrochemical capacitor C2 and resistance R 4 and NPN transistor VT1, the collector electrode of NPN transistor VT1 is by the anodal VCC of resistance R 5 connection circuits;

Zero cross detection circuit: formed by NPN transistor VT2, resistance R 6 and resistance R 7, the end of the base stage connecting resistance R6 of NPN transistor VT2 and an end of resistance R 7, the collector electrode of NPN transistor VT2 connects the collector electrode of NPN transistor VT1, the anodal VCC of the other end connection circuit of resistance R 6, the emitter connection circuit ground GND of the other end of resistance R 7 and NPN transistor VT2;

Charging control circuit and electricity storage preventing tank discharge circuit: formed by unidirectional controllable silicon S CR and isolating diode D1, the anodal VCC of the anode connection circuit of unidirectional controllable silicon S CR, the control utmost point of unidirectional controllable silicon S CR connects the collector electrode of NPN transistor VT1, the negative electrode of unidirectional controllable silicon S CR connects the positive pole of isolating diode D1, the negative pole of isolating diode D1 connects the positive pole of batteries, the negative pole connection circuit ground GND of batteries.

The charged state indicating circuit: be comprised of LED and resistance R 2, the positive pole of LED is by the negative electrode of resistance R 2 orders to controllable silicon SCR, the negative pole connection circuit ground GND of LED.

The positive pole of full bridge rectifier output links to each other with circuit anode VCC, and the negative pole of full bridge rectifier output links to each other with circuit ground GND.

Description of drawings

Accompanying drawing 1 is the embodiment circuit working schematic diagram that the utility model provides a LED flashlight charging automatic stop arrangement.

Embodiment

According to being circuit working schematic diagram and the description of drawings of LED flashlight charging automatic stop arrangement shown in the accompanying drawing 1, and according to the annexation between the components and parts in the described each several part circuit of utility model content, and the components and parts technical parameter described in the execution mode requires to implement to realize the utility model.

The selection of components and parts and technical parameter thereof

QZ is the full-bridge rectification element, and can select 4 models is the silicon rectifier diode of 1N4007;

VT1, VT2 are NPN transistor, and the model of selecting is 2SC9014;

SCR is one-way SCR, requires withstand voltage 〉=400V, and selecting model is 100-6 or BT169 etc.;

DW is voltage stabilizing didoe, and its voltage stabilizing value parameter is 4.4V;

D1 is silicon rectifier diode, and the model of selecting is 1N4001;

LED is light-emitting diode, selects ￠ 5 red light emitting diodes;

The resistance of resistance R 1 is 470k Ω, and power is 2W; The power of other resistance is 1/8W, and the resistance of resistance R 2 is 1k Ω; The resistance of resistance R 3 is 5.6k Ω; The resistance of resistance R 4 is 6.8k Ω; The resistance of resistance R 5 is 220k Ω; The resistance of resistance R 6 is 510k Ω; The resistance of resistance R 7 is 22k Ω;

C1 is electric capacity of the dacron, and its capacity is 1 μ F, and withstand voltage is 450V; C2 is electrochemical capacitor, and its capacity is 220 μ F/16V.

Making main points and the circuit debugging of circuit

Fairly simple because of the circuit structure of LED flashlight charging automatic stop arrangement, comparison is easy, as long as the components and parts performance of using is intact, the physical connection of components and parts is correct, circuit does not generally need to debug namely and can work;

Voltage stabilizing didoe DW should determine according to the battery charging final voltage, considers that batteries is passed through the self discharge electric current of circuit little, and voltage detecting circuit can be determined by the resistance of semifixed resistor R4;

Circuit of the present utility model can be according to the magnitude of voltage that is full of of batteries, as: in the time of need to be to the battery charging of 6V or 12V, as long as can realize by the voltage stabilizing didoe of selecting proper parameter.

Claims

1. LED flashlight charging automatic stop arrangement, it is by the 220V alternating current, capacitance-resistance voltage reduction circuit, full bridge rectifier, voltage detecting circuit and circuits for triggering, zero cross detection circuit, charging control circuit and electricity storage preventing tank discharge circuit, charged state indicating circuit and batteries consist of, and its feature comprises:

Described voltage detecting circuit and circuits for triggering are comprised of voltage stabilizing didoe DW, resistance R 3, electrochemical capacitor C2, resistance R 4, NPN transistor VT1 and resistance R 5, the negative pole of voltage stabilizing didoe DW connects the positive pole of electrochemical capacitor C2 and the positive pole of batteries by resistance R 3, the positive pole of voltage stabilizing didoe DW connects an end of base stage and the resistance R 4 of NPN transistor VT1, the emitter connection circuit ground GND of the other end of the negative pole of electrochemical capacitor C2 and resistance R 4 and NPN transistor VT1, the collector electrode of NPN transistor VT1 is by the anodal VCC of resistance R 5 connection circuits;

Described zero cross detection circuit is comprised of NPN transistor VT2, resistance R 6 and resistance R 7, the end of the base stage connecting resistance R6 of NPN transistor VT2 and an end of resistance R 7, the collector electrode of NPN transistor VT2 connects the collector electrode of NPN transistor VT1, the anodal VCC of the other end connection circuit of resistance R 6, the emitter connection circuit ground GND of the other end of resistance R 7 and NPN transistor VT2;

Described charging control circuit and electricity storage preventing tank discharge circuit are comprised of unidirectional controllable silicon S CR and isolating diode D1, the anodal VCC of the anode connection circuit of unidirectional controllable silicon S CR, the control utmost point of unidirectional controllable silicon S CR connects the collector electrode of NPN transistor VT1, the negative electrode of unidirectional controllable silicon S CR connects the positive pole of isolating diode D1, the negative pole of isolating diode D1 connects the positive pole of batteries, the negative pole connection circuit ground GND of batteries.

2. LED flashlight according to claim 1 charging automatic stop arrangement, it is characterized in that: the charged state indicating circuit is comprised of LED and resistance R 2, the positive pole of LED is by the negative electrode of resistance R 2 orders to controllable silicon SCR, the negative pole connection circuit ground GND of LED.

3. LED flashlight according to claim 1 charging automatic stop arrangement, it is characterized in that: the positive pole of full bridge rectifier output links to each other with circuit anode VCC, and the negative pole of full bridge rectifier output links to each other with circuit ground GND.