CN2476126Y

CN2476126Y - Charger

Info

Publication number: CN2476126Y
Application number: CN 00240420
Authority: CN
Inventors: 范汉强
Original assignee: Administration Center Of China Ev Test And Demonstration Zone
Current assignee: Administration Center Of China Ev Test And Demonstration Zone
Priority date: 2000-12-11
Filing date: 2000-12-11
Publication date: 2002-02-06
Anticipated expiration: 2010-12-11

Abstract

The utility model discloses a charger, which comprises a plurality of serial rechargeable batteries, and pulse chargers corresponding to the rechargeable batteries. Each serial rechargeable battery is connected in parallel with a separate pulse charger and forms a separate charge-discharge loop to individually charge or discharge each serial rechargeable battery. The pulse charger has a discharge circuit, a limit voltage circuit and a constant current circuit. The utility model can make all serial rechargeable batteries keep balance during charge and discharge, and does not make the battery damaged or blasted due to overflow and over-voltage in the event of a long-time charge. Therefore, the utility model can be used for electric vehicles and transformer substation, and so on.

Description

One charging device

The utility model relates to the charging device that a kind of electrical automobile of powering, transformer station etc. use.

In the prior art, the power supply electrical automobile, the charging device of uses such as transformer station all is to form the loop with a charger and a plurality of series connected battery, simultaneously a plurality of series connected battery are charged, and each series connected battery performance can not be identical, therefore when charge or discharge, can cause the lack of uniformity between each series-connected cell, filling, during discharge, also underfill of the battery that has, the battery that has is overcurrent, overvoltage usually makes battery damage, even set off an explosion, series connected battery is many more, and it is many more to discharge and recharge number of times, causes the lack of uniformity between each series-connected cell also just serious more, and charging current is big more, and is also big more to the damage of battery.

The purpose of this utility model is to provide a kind of each serial connection charge battery that can make when charge and discharge, the charging device of keeping in balance.

For achieving the above object, the utility model comprises the rechargeable battery of several series connection and identical pulse charger corresponding to the rechargeable battery number, each serial connection charge battery also connects an independently pulse charger, and form separately independently charging and discharging circuit, the rechargeable battery of each series connection is carried out independent discharging and recharging.

Pulse charger described in the utility model, by the half-bridge switch power source circuit, full-wave rectifier filter circuit and pulse-width modulation circuit are formed, the pulse-width modulation circuit output is coupled through pulse transformer T2, two groups of secondary outputs of this pulse transformer T2 insert two switch triode V1 in the half-bridge switch power source circuit respectively, the grid of V2, trigger the conducting of two switching tubes, the power supply that inserts is through transformer T1, rectifier diode D1, D2 and inductance L, the current rectifying and wave filtering circuit output dc voltage that capacitor C 3 is formed, direct voltage inserts the two ends of rechargeable battery, and battery is charged.

As to further improvement of the utility model, described pulse charger also is provided with pressure limiting circuit, form by divider resistance R1, R2, R3 and optocoupler OP2, two divider resistance R1 and R2 series connection insert on the both positive and negative polarity of output dc voltage, the series termination of two divider resistances is gone into the trigger end of optocoupler OP2, and the output of optocoupler OP2 links to each other with the control end of pulse-width modulation circuit PWM through divider resistance R3.

Described pulse charger also is provided with current-limiting circuit, form by current transformer IF, rectifier bridge, adjustable potentiometer P1 and triode Tr1, current transformer inserts on the major loop of switching power circuit, the output of current transformer inserts rectifier bridge, the output of this electric bridge connects two constant ends of adjustable potentiometer P1, the adjustable termination of potentiometer is gone into the base stage of triode Tr1, and collector electrode links to each other with the control end of pulse-width modulation circuit through divider resistance R3.

Described pulse charger also is provided with regularly discharge circuit, form by timer, optocoupler OP1 and switch triode V3, timer is connected between output dc voltage positive and negative, the output of timer links to each other with the grid of switch triode and the trigger end of optocoupler OP1 respectively, the drain electrode of switch triode, source electrode connect respectively on the both positive and negative polarity of output dc voltage, and optocoupler OP1 output links to each other with the control end of pulse-width modulation circuit through resistance R 4.

The utility model is because in the series connected battery circuit, each battery also connects an independently pulse charger, have discharge, pressure limiting, constant-current circuit in the pulse charger, therefore, when charging, the bubble that battery is emitted seldom, when cell voltage reaches pressure limiting, enter floating charge state, charging current can be more and more littler, have suffered charging process, the light current pond needs the long charging interval, and the forceful electric power pond charging interval is short, reaches all batteries equilibrium state at last, even long-time charging can overcurrent, overvoltage damages battery or the phenomenon of blast yet; The series-parallel circuit that is connected to a complexity of battery and charger can not damage battery by large current charge.

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is the functional-block diagram of the concrete embodiment of the utility model;

Fig. 2 is the circuit diagram of pulse charger in the utility model.

As shown in Figure 1 and Figure 2, the rechargeable battery of three series connection of present embodiment and three identical pulse charger, each serial connection charge battery also connects an independently pulse charger, and forms separately independently charging and discharging circuit, and the rechargeable battery of each series connection is carried out independent discharging and recharging.Pulse charger is by half-bridge switch power source circuit 1, full-wave rectifier filter circuit 2 and pulse-width modulation circuit 3 are formed, pulse-width modulation circuit 3 outputs are coupled through pulse transformer T2, two groups of secondary outputs of this pulse transformer T2 insert two switch triode V1 in the half-bridge switch power source circuit 1 respectively, the grid G 1 of V2, G2, trigger the conducting of two switching tubes, the AC power that inserts is through transformer T1, rectifier diode D1, D2 and inductance L, the current rectifying and wave filtering circuit output dc voltage that capacitor C 3 is formed, direct voltage inserts the two ends of rechargeable battery, and battery is charged.

As further improvement, be provided with pressure limiting circuit 5, current-limiting circuit 6 and timing discharge circuit 4 in the described pulse charger, pressure limiting circuit 5 is made up of divider resistance R1, R2, R3 and optocoupler OP2, two divider resistance R1 and R2 series connection insert on the both positive and negative polarity of output dc voltage, the series termination of two divider resistances is gone into the trigger end of optocoupler OP2, and the output of optocoupler OP2 links to each other with the control end of pulse-width modulation circuit 3 through divider resistance R3; Current-limiting circuit 6 is made up of current transformer IF, rectifier bridge, adjustable potentiometer P1 and triode Tr1, current transformer inserts on the major loop of switching power circuit, the output of current transformer inserts rectifier bridge, the output of this electric bridge connects two constant ends of adjustable potentiometer P1, the adjustable termination of potentiometer is gone into the base stage of triode Tr1, and collector electrode links to each other with the control end of pulse-width modulation circuit through divider resistance R3; Regularly discharge circuit 4 is made up of timer, optocoupler OP1 and switch triode V3, timer is connected between output dc voltage positive and negative, the output of timer links to each other with the grid of switch triode and the trigger end of optocoupler OP1 respectively, the drain electrode of switch triode, source electrode connect respectively on the both positive and negative polarity of output dc voltage, and optocoupler OP1 output links to each other through the control end of resistance R 4 with pulse-width modulation circuit 3.

Operation principle of the present utility model is described below:

Produce pwm voltage by pulse-width modulation circuit 3, coupling through pulse transformer T2, the two groups of secondary output voltage trigger switch pipe V1 of this pulse transformer T2 and V2 conducting, the power supply that inserts is through transformer T1, rectifier diode D1, D2 and inductance L, the current rectifying and wave filtering circuit output dc voltage that capacitor C 3 is formed, direct voltage inserts the two ends of rechargeable battery, can charge to battery.The pulse of initial pulse-width modulation circuit 3 outputs is the wideest, makes the direct voltage and the electric current maximum of output, can make optocoupler OP2 conducting, the voltage of resistance R 3 descends like this, the voltage of R3 is high more, and the pulse of pulse-width modulation circuit 3 outputs is wide more, otherwise, the voltage of resistance R 3 reduces, the pulse narrowing of pulse-width modulation circuit 3 outputs is adjusted divider resistance R1, the resistance value of R2, make the direct voltage stuck-at-5V of output, battery is carried out the pressure limiting charging.

The bridge rectifier that the output voltage of current transformer IF is formed through D3-D7, the output DC position, when charging current is too high, the output DC position is higher than the voltage that adjustable potentiometer P1 sets up by current transformer IF induction, make triode Tr1 conducting this moment, the voltage of resistance R 3 descends, the pulse narrowing of pulse-width modulation circuit 3 outputs, the Control current charging reaches constant current charge.

After charging reached about 2 seconds, timing circuit T started, the pulse of generation, make optocoupler OP1 conducting, the voltage of resistance R 4 descends, and makes the output pulse-off of pulse-width modulation circuit 3, promptly stop charging, simultaneously, switching tube V3 conducting, to battery discharge, the pulse of timing circuit T disappears, and pulse-width modulation circuit 3 has pulse output again, promptly restarts charging, this process constantly repeats down, has just constituted charging, stops, having discharged.

Claims

1, a kind of charging device, the rechargeable battery that comprises several series connection, it is characterized in that: also comprise identical pulse charger corresponding to the rechargeable battery number, each serial connection charge battery also connects an independently pulse charger, and form separately independently charging and discharging circuit, the rechargeable battery of each series connection is carried out independent discharging and recharging.

2, charging device according to claim 1, it is characterized in that: described pulse charger, by half-bridge switch power source circuit (1), full-wave rectifier filter circuit (2) and pulse-width modulation circuit (3) are formed, pulse-width modulation circuit (3) output is coupled through pulse transformer (T2), two groups of secondary outputs of this pulse transformer (T2) insert two switch triodes (V1) in the half-bridge switch power source circuit respectively, (V2) grid, trigger the conducting of two switching tubes, the power supply that inserts is through transformer (T1), rectifier diode (D1), (D2) and inductance (L), the current rectifying and wave filtering circuit output dc voltage that electric capacity (C3) is formed, direct voltage inserts the two ends of rechargeable battery, and battery is charged.

3, charging device according to claim 1 and 2, it is characterized in that: described pulse charger is provided with pressure limiting circuit (5), form by divider resistance (R1), (R2), (R3) and optocoupler (OP2), two divider resistances (R1) and (R2) series connection insert on the both positive and negative polarity of output dc voltage, the series termination of two divider resistances is gone into the trigger end of optocoupler (OP2), and the output of optocoupler (OP2) links to each other through the control end of divider resistance (R3) with pulse-width modulation circuit (3).

4, charging device according to claim 3, it is characterized in that: described pulse charger is provided with current-limiting circuit (6), form by current transformer (IF), rectifier bridge, adjustable potentiometer (P1) and triode (Tr1), current transformer inserts on the major loop of switching power circuit, the output of current transformer inserts rectifier bridge, the output of this electric bridge connects two constant ends of adjustable potentiometer (P1), the adjustable termination of potentiometer is gone into the base stage of triode (Tr1), and collector electrode links to each other through the control end of divider resistance (R3) with pulse-width modulation circuit (3).

5, charging device according to claim 4, it is characterized in that: described pulse charger is provided with regularly discharge circuit (4), form by timer (T), optocoupler (OP1) and switch triode (V3), timer is connected between output dc voltage positive and negative, the output of timer links to each other with the grid of switch triode and the trigger end of optocoupler (OP1) respectively, the drain electrode of switch triode, source electrode connect respectively on the both positive and negative polarity of output dc voltage, and optocoupler (OP1) output links to each other through the control end of resistance (R4) with pulse-width modulation circuit (3).