CN2701145Y

CN2701145Y - Temperature compensation type float charging voltage equalizer for battery

Info

Publication number: CN2701145Y
Application number: CNU2004200417204U
Authority: CN
Inventors: 仲宝林
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-03-31
Filing date: 2004-03-31
Publication date: 2005-05-18
Anticipated expiration: 2014-03-31

Abstract

The utility model relates to a temperature compensation type float charging voltage equalizer for battery, which is used for equalizing the voltage at the battery end of an electric battery. The utility model is composed of a reference voltage set circuit, a sampling circuit, a temperature compensation circuit, a comparator circuit, an amplitude limiting isolation circuit, and an execution circuit. While working, a signal sent by the sampling circuit is compared with a signal of a reference voltage value by the comparator circuit. When it is detected that the voltage of a certain battery in an electric battery exceeds the set reference voltage value, the comparator circuit can output signals to the execution circuit, which can then open a by-pass, so that the excessive float charging currents can be by-passed to avoid the occurrence of overcharging in the battery. When a float charging voltage is accorded with the requirement, the execution circuit can allow all the float charging currents going through a plate of the battery, so that a terminal voltage can be increased to reach the goals of equalizing compensation and balancing the end voltage of each battery in the electric battery.

Description

Battery pack temperature compensation type float charge voltage equalizer

Affiliated technical field

The utility model belongs to technical field of electronic equipment, relates to a kind ofly being used for preventing that battery the battery pack float charge voltage equalizer of situation that charges and overcharge occurs owing in the floating charge process in the battery pack.

Background technology

The battery float process is to replenish the battery internal loss and keep the consistent process of battery terminal voltage balance.Battery pack when operate as normal, rectifier and battery pack parallel running, the caused capacitance loss of self-discharge of battery is replenished in the floating charge process, after civil power stopped, the load required electric power was then provided separately by battery.Because the inconsistency of cell making process and assembling process, the self discharge situation of cell has nothing in common with each other, thereby causes between the terminal voltage of each battery in the battery pack and have bigger voltage difference.The principle that in series circuit, everywhere equates according to electric current, work was identical by the electric current of each battery therebetween when battery pack was done floating charge, but because the terminal voltage of each battery has difference, behind the floating charge certain hour, the battery that can have has reached the terminal voltage value of setting, the battery that has also has certain gap from set point, the phenomenon that individual cell has but been overcharged, after this if continue floating charge again, by the time when original lower battery of terminal voltage reaches set point, original battery that has met or exceeded set point but might be impaired, this phenomenon can have influence on the service life of battery pack undoubtedly, also becomes this area and needs one of problem of solution badly.

The utility model content

The purpose of this utility model is the problems referred to above are solved, but and then a kind of novel structure, Auto-Sensing battery cell operating state easy to use is provided and prevents that effectively the battery pack temperature compensation type float charge voltage equalizer of situation that charges and overcharge from appearring owing in battery in the floating charge process.

Be used for realizing that the technical solution of above goal of the invention is such: the battery pack temperature compensation type float charge voltage equalizer that is provided is that a kind of being installed on can be regulated the intelligent electric current automatic regulator of boosting battery terminal voltage automatically according to the battery needs on each cell of battery pack, it is by reference voltage setting circuit, sample circuit, temperature-compensation circuit, comparison circuit, amplitude limit buffer circuit and executive circuit are formed, wherein: the output of reference voltage setting circuit and temperature-compensation circuit all is connected to the input of sample circuit, the sample circuit output is connected with the comparison circuit input, and the comparison circuit output links through the input of amplitude limit buffer circuit and executive circuit.Be provided with the DC/DC boost conversion circuit in the equalizer and be used for low-voltage DC is become high voltage direct current for the use of this machine, and utilize reference voltage setting circuit to establish required battery benchmark float charge voltage value in advance.In the real work, will compare by signal and the reference voltage value signal that sample circuit is sent here by comparison circuit, in order to the operating state of perception battery pack; When the voltage of certain battery surpasses the benchmark float charge voltage value of setting in predicting battery pack, give shunting of executive circuit by comparison circuit by the amplitude limit buffer circuit and carry out signal, make executive circuit open bypass, quantitatively shunt unnecessary floating current, reduce to charge into electric current, reduce battery terminal voltage, avoid the situation of overcharging of this battery to take place; When float charge voltage is lower than this battery during needing at that time, then executive circuit will allow whole floating currents by this battery pole plates, improve its terminal voltage, reach the purpose of each battery terminal voltage in isostatic compensation and the balance battery pack.When battery pack changes bulk charge over to by floating charge, stop variously even sample circuit records this device circuit of back, charger still can be given the battery pack average charge according to its set point in advance.

Because battery terminal voltage when float charge voltage equalizer described in the utility model can be regulated floating charge automatically according to the battery needs; the difference of its terminal voltage of battery pack of this equalizer has been installed returns below the feasible value that reaches relevant departments very soon; therefore it is very necessary when each battery also irreversible lesion do not occur on the battery pack of new clothes or in battery pack this equalizer to be installed; it can effectively increase battery capacity; the protection battery; prevent that battery owing the charging and the phenomenon of overcharging in the floating charge process, when prolonging the cell life-span, also increased the service life of battery pack greatly.Except that above-mentioned useful usefulness, the utility model also has advantages such as simple in structure, with low cost, convenient and practical.

Description of drawings

Fig. 1 is an operation principle block diagram of the present utility model.

Fig. 2 is the electrical block diagram of a specific embodiment device of the utility model.

Embodiment

Referring to accompanying drawing, battery pack temperature compensation type float charge voltage equalizer described in the utility model contains circuit such as reference voltage setting circuit 1, sample circuit 2, temperature-compensation circuit 3, comparison circuit 4, amplitude limit buffer circuit 5 and executive circuit 6, wherein the output of reference voltage setting circuit 1 and temperature-compensation circuit 3 is connected to comparison circuit 4 inputs through sample circuit 2, comparison circuit 4 outputs are connected with executive circuit 6 inputs through amplitude limit buffer circuit 5, and device provides working power by the DC/DC boost conversion circuit for each circuit.In example structure shown in Figure 2, reference voltage setting circuit 1 is made of resistance R 1 and voltage-stabiliser tube D1, temperature-compensation circuit 3 adopts temperature rise resistance R 2, the R3 of positive temperature coefficient to form by two, sample circuit 2 is made of sample resistance W1, W2, comparison circuit 4 comprises double operational device IC1, IC2, amplitude limit buffer circuit 5 adopts transport and placing device IC3, all can to adopt from model be the integrated chip of LM339 for transport and placing device IC1, IC2, IC3 in the practical structures, and executive circuit 6 is made of electronic switch BG1, diode D2 and resistance R 4.The present embodiment structure is by three low power consumption high-precision operational amplifier IC1, IC2, IC3 forms the core of full device circuit, by sample resistance W1, the two-way reference signal that W2 obtains is delivered to transport and placing device IC1 respectively, the in-phase end of IC2 and end of oppisite phase, reference signal is also received IC1 respectively, the in-phase end of IC2 and end of oppisite phase, after the inside of two transport and placing device IC1 and IC2 compares, exporting one can be for the signal voltage of carrying out, this voltage is sent to electronic switch BG1 after passing through the amplitude limit buffer circuit 5 that is made of transport and placing device IC3, the signal deciding that electronic switch BG1 then brings according to transport and placing device is opened or closed electronic load circuit, determine promptly whether this device divides the terminal voltage of galvanic battery, reaching the control battery terminal voltage with this is the purpose of a specific magnitude of voltage.In addition, this device is owing to adopted the sampling current limiting element of positive temperature coefficient element as reference voltage, resistance also increases thereupon when temperature raises, the every rising of temperature once, obtained sampling voltage approximately reduces 0.003mV, so just make the corresponding reduction of electronic switch threshold voltage, reach the purpose of temperature-compensating; In like manner, the every reduction of temperature once, the sampling voltage 0.003mV that then approximately raises, the corresponding thereupon increase of electronic switch threshold voltage has reached the purpose of the variation of the battery terminal voltage that compensation brings by variations in temperature equally.

Claims

1, a kind of battery pack temperature compensation type float charge voltage equalizer, it is characterized in that it is made up of reference voltage setting circuit (1), sample circuit (2), temperature-compensation circuit (3), comparison circuit (4), amplitude limit buffer circuit (5) and executive circuit (6), the output of reference voltage setting circuit (1) and temperature-compensation circuit (3) all is connected to the input of sample circuit (2), sample circuit (2) output is connected with comparison circuit (4) input, and comparison circuit (4) output links through the input of amplitude limit buffer circuit (5) with executive circuit (6).