CN2442439Y

CN2442439Y - Pulse type charger

Info

Publication number: CN2442439Y
Application number: CN 00242734
Authority: CN
Inventors: 陈松锦
Original assignee: JIDACHENG ENTERPRISE CO Ltd
Current assignee: JIDACHENG ENTERPRISE CO Ltd
Priority date: 2000-08-04
Filing date: 2000-08-04
Publication date: 2001-08-08
Anticipated expiration: 2010-08-04

Abstract

The utility model relates to a pulse type charger. Particularly, the utility model relates to the design in which the characteristics of +,-, delta, and V of batteries are not used as foundations for charging interruption, and multistage charging is used so as to prevent shortened service life caused by overheating batteries. In the structure of the utility model, the utility model is mainly composed of a pulse generator, a transistor switch, an over-voltage protection circuit, etc. Pulse signals are used for controlling charging. At first, charging is carried out in the quick charging mode, then the quick charging mode is changed into the slow charging mode when battery voltage reaches 90% of saturation voltage, and the slow charging mode is changed into the dead slow charging mode for charging when charging is about to come to an end. As a result, the supersaturation problem of batteries is prevented.

Description

Pulse type charger

The utility model is a kind of pulse type charger, be mainly a kind of utilize pulse mode charging and can provide fast in different phase, at a slow speed with the charger of function such as dead slow speed charging, with exempt conventional charger ± Δ V detects the oversaturated problem of battery of being derived, reach to improve battery useful life.

Press the structure of charger now, all be to use microprocessor (CPU) to detect battery whether to be full of and to determine when that outage stops charging, and its principle of cutting off the power supply is automatically promptly carried out the detection of storage battery or rechargeable battery ± Δ V characteristic, so-called ± Δ V is the battery charge phenomenon that terminal voltage rises slightly or descends when saturated, and general charger constantly writes down present voltage by internal microprocessor, compare with the voltage that records next time, if the phenomenon that voltage descends or skyrockets takes place, promptly represent battery saturated, stop charging so cut off charge circuit, the certain effect of tool though this practice is quite direct, yet still have some shortcoming on actual the use, the spy is analyzed as follows for this reason:

1. be that battery produces the stage of " supersaturation " its opportunity of cutting off the power supply automatically, but the then related bad phenomenon that causes the battery heating of this supersaturation when battery charge is too frequent, causes damaging or causing the shortcoming of shortening in useful life easily because of heating.

2. must carry out elder generation's discharge operation before the charging, otherwise can't reach best effect: because storage battery or rechargeable battery are after charging, make battery produce false saturated and memory effect easily, so that influence battery efficiency, so when charging, must earlier battery be discharged fully, but this measure makes more complicated and time consumption of operation.

3. cost is higher: owing to must use microprocessor accurately to remember and control, cause cost to rise.

4. when battery behavior is relatively poor, the puzzlement that existence can't be cut off the power supply automatically: when battery behavior is not ideal, can't in time produce when saturated ± Δ V or this dropping voltage characteristic do not occur, cause battery badly damaged, even the problem of fail safe aspect occurs.

So as can be known from above related description to conventional charger, cause the battery heating easily and influence the problem in useful life except that existing, also exist and to discharge operation before the charging and cause the inconvenient and cost of operation, remain actively to be sought other solution than problems such as height.

Main purpose of the present utility model is to provide a kind of pulse type charger, be mainly a kind ofly do not use ± Δ V is as the charger of the another kind of type of outage automatically, this charger can produce the charge mode of different kenels along with the charged state of battery, promptly at the charging initial stage, to use the pulse quick mode to charge, treat reach capacity about 90% o'clock of voltage of cell voltage, then automatically conversion with pulse at a slow speed mode charge, and when treating that cell voltage is full, more change in pulse dead slow speed mode and charge, solve the saturated overheated shortcoming of battery thus.

The charging kenel of aforementioned pulse type charger can prevent suitably that battery from producing false saturated phenomenon, so need not the operation of discharging before charging, makes the charging operation comparatively easy.

Aforementioned pulse type charger, its internal structure only can constitute with general electronic building brick, and microprocessor that need not be expensive can reduce manufacturing cost effectively.

The utility model relates to a kind of pulse type charger, the transistor switch, output pulse signal of comprise supply convertor that the battery charge required electric power is provided, whether delivering to battery in order to control supply convertor output voltage with the decision transistor switch whether conducting pulse generator, in order to detect aforementioned power source converter output voltage and to change the excess voltage protection of pulse generator output state by this; Wherein:

Supply convertor mainly is made of a pressurizer, and its input and output are arranged with makes the resistance that the magnitude of current is set and voltage quasi position is set.

Aforesaid transistor switch is made of a transistor, and its collector electrode is connected to an end of battery, and its base stage is connected to the output of pulse generator.

Aforesaid excess voltage protection mainly is made of comparator, and an input of comparator is connected to the output of supply convertor, and another input is for setting reference voltage end, and its output is connected to pulse generator.

Aforesaid pulse generator is made of an operational amplifier, is connected resistance, electric capacity respectively to constitute a positive feedback oscillation loop between its two input and output.

The pressurizer input of aforementioned power source converter is provided with makes the resistance that the magnitude of current is set usefulness.

Further specify specific structural features of the present utility model and purpose below in conjunction with accompanying drawing.

Fig. 1 is a circuit block diagram of the present utility model.

Fig. 2 is a detailed circuit diagram of the present utility model.

As shown in Figure 1, circuit block diagram of the present utility model includes:

One supply convertor 10 provides the battery charge required electric power;

Whether one transistor switch 20 delivers to battery 50 in order to control supply convertor 10 output voltages;

One pulse generator 30 provides output pulse signal with the whether conducting of decision transistor switch 20;

Whether one excess voltage protection 40 has too high phenomenon in order to detect aforementioned power source converter 10 output voltages, and changes pulse generator 30 output states by this; Wherein:

See also Fig. 2, this supply convertor 10 mainly is made of a pressurizer 11, and its input and output are arranged with resistance 12～14, makes the magnitude of current respectively and sets and the voltage quasi position set-up function, uses the required stable power of supply battery 50 chargings.The over-charging of battery phenomenon of this supply convertor 10 in order to prevent that abnormal voltage output from being caused guaranteed unlikely the overcharging of battery and damaged.Be that the terminal voltage of battery 50 and the magnitude of voltage of supply convertor 10 settings are delivered in the excess voltage protection 40 simultaneously, judge whether cell voltage surpasses due saturation level.

Whether transistor switch 20 is made of a transistor, and its collector electrode is connected an end of battery 50, and base stage is connected the output of pulse generator 30, utilize the pulse signal control battery 50 of pulse generator 30 outputs to charge.

Pulse generator 30 when making it enter the pulse current charge pattern, is that benchmark move according to this pulse for supply triggers the required pulse signal of transistor switch 20.And pulse generator mainly is made of an operational amplifier U1C, sets up electric capacity, resistance between its input and output side separately, to constitute positive feedback oscillation loop, sends oscillating impulse and gives transistor switch 20.

Excess voltage protection 40 mainly is made of a comparator U1B; one input end is connected to the output of supply convertor 10 by resistance 41; another input connects divider resistance 42,43; to obtain reference voltage, the output of comparator U1B then connects on the negative feedback end of pulse generator 30, so that when supply convertor 10 output voltages are too high phenomenon; make pulse generator 30 outputs present electronegative potential; make transistor switch 20 not conductings,, reach the protection purpose to block charging current.

In the explanation of aforementioned functional calcspar, the matching relationship that the most special place is supply convertor 10 and pulse generator 30 and passes through accurate of supply convertor 10 setting voltages, its concrete workflow is as described below:

At the beginning of activating, when not reaching cell voltage setting standard position, with the pulse quick mode battery 50 is charged, if battery 50 voltages have reached when setting accurate, then be automatically converted to the charging of pulse slow speed mode, if reach capacity the stage, then be transformed into pulse dead slow speed charge mode automatically, with extremely slow speed battery is carried out pulse charging, use the self discharge problem that overcomes battery itself, make battery maintain full state.And aforesaid is to adjust along with the charging degree of saturation of battery itself is self-with the dead slow speed charge mode fast, at a slow speed, need not use microprocessor or other detection components, so just circuit structure is not simple, and moves precise and stable.Moreover, under aforementioned multistage pattern, make battery near saturation point by the pulse current charge pattern, produce shortcoming overheated and that therefore cause battery to shorten useful life during solution battery supersaturation that so can be suitable, the also unlikely influence that is subjected to memory effect of cell of while charging kenel of the present utility model.

Claims

1. pulse type charger, its feature comprises at described pulse type charger

Provide the battery charge required electric power supply convertor,

In order to control supply convertor output voltage whether deliver to battery transistor switch,

Output pulse signal with the decision transistor switch whether conducting pulse generator,

In order to detect the excess voltage protection that aforementioned power source converter output voltage also changes the pulse generator output state by this; Wherein:

Described supply convertor mainly is made of a pressurizer, and its output is provided with makes the resistance that voltage quasi position is set usefulness.

2. pulse type charger as claimed in claim 1 is characterized in that: described transistor switch is made of a transistor, and its collector electrode is connected to an end of battery, and its base stage is connected to the output of pulse generator.

3. pulse type charger as claimed in claim 1; it is characterized in that: described excess voltage protection mainly is made of comparator; one input of described comparator is connected to the output of supply convertor, and another input is for setting reference voltage end, and its output is connected to pulse generator.

4. as claim 1,2 or 3 described pulse type chargers, it is characterized in that: described pulse generator is made of an operational amplifier, is connected resistance, electric capacity respectively to constitute a positive feedback oscillation loop between its two input and output.

5. pulse type charger as claimed in claim 1 is characterized in that: the pressurizer input of described supply convertor is provided with makes the resistance that the magnitude of current is set usefulness.