CN2382157Y

CN2382157Y - Automatic electric charger

Info

Publication number: CN2382157Y
Application number: CN 97236225
Authority: CN
Inventors: 高文
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-06-02
Filing date: 1997-06-02
Publication date: 2000-06-07
Anticipated expiration: 2007-06-02

Abstract

The utility model relates to a full-automatic charger which has the functions of constant current charge, automatic charge stop after full charge, and protection against the open circuit of an accumulator, poor contact, no load of the charger, the short circuit of the accumulator, the direct short circuit of the output end of the charger, and the inverse connection of the accumulator. A light-emitting diode is used for displaying whether the utility model is normal or not. A common electronic component with stable performance is used, and electricity consumption is about 1.5MA after protecting the charger. The utility model can be used for charging the accumulators of 12V, 24V and 36V only by changing specifications of a transformer and a few of parts.

Description

Full-automatic charger

The utility model relates to a kind of full-automatic charger with kinds of protect function.

Existing its defencive function imperfection of charger, unreasonable structure, some electric current and voltage controlled function does not possess, for example: the miniature charge power supply of patent No. ZL95214074.8.Though this circuit is simple, only is equivalent to common whole current circuit charger, can't carry out additives for overcharge protection to storage battery.

The purpose of this utility model provides a kind of can control charge in batteries electric current, voltage enforcement; and in the storage battery short circuit, open circuit, loose contact, non-loaded, connect anti-, charger output direct short-circuit, can both protect charger excellent effectively, also have one and can show normal improper indicating device.

In order to achieve the above object, this programme is with the comparator that a positive input and a reverse input end are arranged, be connected into input voltage comparator in the same way, the light-operated coupling apparatus of access between the pipe is adjusted in output and prime charging at comparator, comparator output low level and storage battery constitute the temporary steady charge loop of a closure when charging normal, the comparator upset is high level when charge in batteries arrives set point, go to turn-off charging by light-operated coupling apparatus and adjust pipe, constitute like this full-automatic charger agent structure., be not direct ground connection simultaneously at the earth terminal of the input stage of light-operated coupling apparatus, but by two electronic switches respectively ground connection, connect positive supply.When storage battery connect anti-after, charger protects automatically.When the storage battery short circuit, owing to use the effect of VMOS field effect transistor, electric current does not change, and charger is not impaired.Also have one to show whether normally luminous indicating lamp of charging.

The such scheme description of drawings: forward part rectification, filtering, voltage stabilizing are pacified common mode and are constituted.Adjustable resistance W1 in parallel on voltage-stabiliser tube DW1.With the comparator LM358 that a positive input 5 and reverse input end 6 and output 7 are arranged, the 4 end ground connection of (with the integrated circuit LM358 of National Semiconductor's production) comparator LM358,8 of comparator LM358 rectifies to connect positive supply behind series diode D4, being connected to diode D4 negative electrode and ground end after resistance R 4 and voltage-stabiliser tube DW2 (as the accurate voltage stabilizing didoe of the TL431) series connection, intermediate point is received 6 ends of comparator LM385, resistance R 5 and adjustable resistance W2 series connection are received positive supply and ground end, and intermediate point is received 5 ends of comparator LM358.Receive 1 end (for example Motorola Inc produce MOC3021) of light-operated coupling apparatus N1008 behind the 7 end series resistance R3 of comparator LM358,2 of light-operated coupling apparatus N1008 terminate to the C utmost point of electronic switching transistor V2 and electronic switch diode D3 anode, the negative electrode of diode D3 is received positive supply.The two ends that output stage 4,6 ends of light-operated coupling apparatus N1008 are received adjustable resistance W1 respectively.The grid that pipe V1 is adjusted in charging is received and the adjustable resistance W1 mid point of voltage-stabiliser tube DW1 parallel connection (V1 with VMOS field effect transistor, N raceway groove, 2A50V), and (being the charger negative output terminal) held in the drain electrode that the source electrode that pipe V1 is adjusted in charging receives the negative terminal of rectifier filter, adjust pipe V1 to charging with receiving.Receiving between positive supply and the ground end after voltage-stabiliser tube DW3 and the light-emitting diode D5 series connection.

The full-automatic charger operation principle connects storage battery correctly earlier, plugs alternating current, adjustment adjustable resistance W1 meets the requirements charging current.The 5 end sampling voltages of comparator LM358 are lower than the input of 1 end no current, its output 4,6 that the accurate voltage of 6 end groups of comparator LM358, the 7 end low levels of comparator LM358, light-operated lotus root closes N1008 and remain unchanged and be open circuit this moment, charging is adjusted pipe and is continued to keep charging, and the light-emitting diode of voltage-stabiliser tube DW3 conducting simultaneously D5 lights.When charging continues, 5 terminal voltages of comparator LM358 are high level greater than 6 ends of comparator LM358, the 7 ends upset of voltage comparator LM358, through resistance R 3 be input to 1 end of light-operated coupling apparatus N1008, through 2 ends of light-operated coupling apparatus N1008 to the C of electronic switching tube V2, the E utmost point to the ground end, this voltage makes the output 4,6 of light-operated coupling apparatus N1008 become conducting by open circuit, the bias voltage that pipe V1 is adjusted in charging is by short circuit and the indication that stops, charge of pinch off, charging does not work, and diode D6 prevents refluence.This moment rectifying and wave-filtering to go out voltage high-fall on resistance R 1, the about 1.5MA of electric current, this electric current is greater than the electric current of keeping of light-operated coupling apparatus N1008, charger is in guard mode.Storage battery short circuit or output direct short-circuit, because constant current effect, the charging current of VMOS field effect transistor is still constant, charger is not impaired.But this voltage-stabiliser tube DW3 no current, charging light-emitting diode do not work, and illustrate that charging is undesired.Storage battery opens circuit, loose contact, non-loaded, charger are protected automatically, and its principle is with to be full of electric automatic stop function principle identical.After storage battery connects instead; LM358 is not impaired for diode D4 protection comparator; at this moment electronic switching tube V2 does not have positive bias-voltage and ends; but the reverse current that flows to from 4 ends of comparator LM358------------------diode D3 adjusts pipe V1 and is in guard mode by pinch off, charger 2 ends of light-operated coupling apparatus N1008 1 end of light-operated coupling apparatus N1008 resistance R 37 ends of comparator LM358 by the be triggered conducting, charging of positive supply---diode D6---storage battery negative terminal, 4,6 ends of at this moment light-operated coupling apparatus N1008.Charging indication diode D5 does not work, and illustrates that charger is easily normal.

Claims

By a comparator, pipe is adjusted in charging, with photoelectrical coupler is to lead the full-automatic charger that constitutes, wherein 2 ends of photoelectrical coupler N1008 connect the C utmost point of electronic switching transistor V2 simultaneously, hold to ground through the E utmost point, connect electronic switch diode D3 anode, arrive positive supply through negative electrode, rectify at 8 of comparator LM358 and behind series diode D4, to connect positive supply, between the negative electrode and ground end of receiving diode D4 after resistance R 4 and the DW2 series connection, intermediate connection point connects 6 ends of comparator LM358, receiving between positive supply and the ground after resistance R 5 and the adjustable resistance W2 series connection, intermediate connection point is received 5 ends of comparator LM358, receiving after voltage-stabiliser tube DW3 and the light-emitting diode D5 series connection between positive supply and the ground end, 4 of light-operated coupler N1008,6 ends are received the two ends of voltage-stabiliser tube DW1 respectively, the grid that pipe V1 is adjusted in charging is received on the adjustable resistance W1 mid point with voltage-stabiliser tube DW1 parallel connection, charging is adjusted the source electrode of pipe V1 and received rectification, the negative terminal of filtering, the ground end of charger is received in the drain electrode of adjusting pipe V1 charging, and the utility model is characterized in that 2 ends of light-operated coupler N1008 are connect simultaneously the C utmost point of electronic switching transistor V2, hold to ground through the E utmost point, anode with electronic switch diode D3, arrive positive supply through negative electrode.