CN204349551U - A kind of battery discharging instrument - Google Patents

Abstract

The utility model relates to a storage battery discharge instrument, which includes a single-chip microcomputer, a current transformer and a voltage transformer connected in parallel between the positive and negative poles of the battery pack; at least two PTC thermistors are connected in parallel on the branch of the current transformer, each PTC The secondary branches where the thermistors are located are connected with MOS tubes for thermistors, and the driving terminals of the MOS tubes for each thermistors are electrically connected to the single-chip microcomputer; The primary circuit of the transformer is connected with a MOS tube for the transformer, the secondary circuit of the current transformer is connected with a PWM modulation unit, and the secondary circuit of the transformer is connected with a cooling fan. The utility model uses a very simple circuit structure to realize the constant current discharge of the storage battery, without the risk of open fire and high temperature, high safety factor, low failure rate of the whole circuit structure, stable performance and convenient realization.

Description

battery discharger

technical field

The utility model relates to a storage battery discharger.

Background technique

Power plants, power distribution rooms and other occasions must be equipped with backup batteries as emergency power supplies to supply important equipment such as closing operations and emergency lighting. Such batteries are in a floating charge state for a long time, and it is difficult to find deterioration phenomena such as battery capacity reduction. In order to ensure that the battery can be used normally when an emergency occurs, the country also stipulates that each user unit should regularly discharge the backup battery for verification, and a special battery discharger is required.

The battery discharger used in most occasions currently uses electric heating tubes or PTCs as loads, and the control method adopted is series or parallel chopper technology. This type of product often has the following problems in use: 1) The discharger using electric heating tubes The electric heating tube has a red hot phenomenon, and there is an open flame, so the safety factor is not high enough; 2) The chopper circuit used in the conventional PTC discharge instrument has a high failure rate because the switch tube is in a state of switching loss; there is noise during the chopping process, and interferes nearby electronic equipment.

Utility model content

The technical problem to be solved by the utility model is to provide a storage battery discharger with simple structure, convenient control and stable performance.

In order to solve the above technical problems, the storage battery discharge instrument of the present invention includes a single-chip microcomputer, and its structural feature is that the discharge instrument also includes a current transformer and a voltage transformer connected in parallel between the positive and negative poles of the battery pack; the current transformer and the voltage transformer The secondary circuits of the current transformers are all connected to the single-chip microcomputer, and at least two PTC thermistors are connected in parallel on the branch of the current transformer, and the secondary branch where each PTC thermistor is located is connected with a The thermistor of each thermistor uses a MOS tube, and the driving end of each thermistor is electrically connected to the single-chip microcomputer; the discharge instrument also includes a transformer connected between the positive and negative poles of the battery pack, and the primary circuit of the transformer is connected to the battery. The primary circuit is connected with a transformer MOS tube for controlling its on-off, the secondary circuit of the current transformer is connected with a PWM modulation unit used to drive the above-mentioned MOS tube for the transformer, and the secondary circuit of the transformer is connected with a MOS tube for power supply. Cooling fan for PTC thermistor cooling.

The cooling fans include multiple ones connected in parallel, and the numbers of the cooling fans and the PTC thermistors are equal, and the two are provided in one-to-one correspondence.

A fast rectifying diode is connected to the secondary circuit of the transformer.

A filter capacitor is connected to the secondary circuit of the transformer.

The single-chip microcomputer is connected with a communication interface unit.

A keyboard display unit is connected to the single-chip microcomputer.

The beneficial effects of the utility model are: using the positive temperature characteristics of the PTC thermistor, equipped with a single-chip microcomputer and collecting the current and voltage signals through the current transformer and the voltage transformer respectively, and driving a group of cooling fans according to the current and voltage signals, The wind blows to the PTC thermistor installed in the front. When the single-chip microcomputer detects that the discharge current exceeds the preset current, the wind speed of the driving fan will slow down, causing the temperature of the PTC itself to increase and the resistance to increase, thereby reducing the overall current; otherwise, the wind speed Increase, the temperature of the PTC itself is reduced, the resistance of the PTC itself is reduced, and the current is increased, so repeated adjustments are made to achieve the purpose of constant current discharge. It can be seen that the utility model uses a very simple circuit structure to realize the constant current discharge of the storage battery, without the risk of open fire and high temperature, high safety factor, low failure rate of the entire circuit structure, stable performance, and convenient implementation.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

Fig. 1 is a schematic diagram of the circuit principle structure of the utility model.

Detailed ways

Referring to the accompanying drawings, the battery discharger of the present utility model includes a single-chip microcomputer 1, wherein, in order to facilitate the discharger to be connected with a computer or other communication equipment, the single-chip computer 1 is connected with a communication interface unit 12, and the communication interface can adopt communication interfaces such as common RS232. In addition, a keyboard display unit 13 is also connected to the single-chip microcomputer 1 . A keyboard and a display screen are arranged in the keyboard display unit, which are used to program and control the single-chip microcomputer 1 and display information in real time, wherein, the programming control of the single-chip microcomputer 1 and the signal input and output circuits of the single-chip microcomputer 1 are prior art, and will not be repeated here .

Referring to the accompanying drawings, the battery discharger of the present invention also includes a current transformer 2 and a voltage transformer 3 connected in parallel between the positive and negative poles of the battery pack. The secondary circuits of the current transformer 2 and the voltage transformer 3 are all connected to the single-chip microcomputer 1, and at least two PTC thermistors 4 are connected in parallel on the branch of the current transformer 2, and each PTC thermistor 4 is located on the secondary branch. The thermistor MOS tube 5 used to control the on-off of the secondary branch is connected, and the driving end of each thermistor MOS tube 5 is electrically connected to the single-chip microcomputer 1 . The discharge instrument also includes a transformer 6 connected between the positive and negative poles of the battery pack. The primary loop of the transformer 6 is connected to the battery pack and the primary loop is connected with a MOS tube 7 for controlling its on-off transformer. The current transformer 2 A PWM modulation unit 8 for driving the MOS tube 7 for the transformer is connected to the secondary circuit, and a cooling fan 9 for cooling the PTC thermistor 4 is connected to the secondary circuit of the transformer 6 . Radiating fan 9 comprises a plurality of in parallel, and the quantity of cooling fan 9 and PTC thermistor 4 is equal and both are arranged in one-to-one correspondence, three groups of PTC thermistors and three fans are shown in the figure, in practical application, The number of groups increases according to the discharge current of the discharge instrument.

Referring to the accompanying drawings, a fast rectifier diode 10 and a filter capacitor 11 are connected to the secondary circuit of the transformer 6 . The cooling fan 9 is a DC fan, and the connection of the fast rectifying diode 10 and the filter capacitor 11 can ensure the stable operation of the fan.

With reference to accompanying drawing, discharge instrument of the present utility model utilizes the positive temperature characteristic of PTC thermistor 4, is equipped with single-chip microcomputer 1 and carries out the acquisition of current and voltage signal respectively by current transformer 2 and voltage transformer 3, according to current and voltage signal Drive a group of heat dissipation fans 9, and the wind blows to the PTC thermistor 4 installed in the front. When the single-chip microcomputer detects that the discharge current exceeds the preset current, the wind speed of the driving fan slows down, so that the temperature of the PTC thermistor 4 itself rises, and the resistance If the wind speed increases, the temperature of the PTC thermistor 4 itself decreases and the resistance of the PTC thermistor 4 itself decreases, which in turn causes the current to increase. Repeated adjustments in this way achieve constant current discharge. the goal of.

To sum up, the utility model is not limited to the above specific embodiments. Those skilled in the art can make several changes and modifications without departing from the spirit and scope of the present utility model. The protection scope of the utility model should be based on the claims of the utility model.

Claims (6)

1. a battery discharging instrument, comprises single-chip microcomputer (1), it is characterized in that this discharge instrument also comprises and is connected in parallel on current transformer (2) between battery pack positive and negative electrode and voltage transformer (3); The secondary circuit of current transformer (2) and voltage transformer (3) is all connected to described single-chip microcomputer (1), two PTC thermistor (4) at least in parallel on the branch road of current transformer (2), the secondary branch road at each PTC thermistor (4) place is all connected with the thermistor metal-oxide-semiconductor (5) for controlling this secondary branch road break-make, the drive end of each thermistor metal-oxide-semiconductor (5) is all electrically connected to described single-chip microcomputer (1); Described discharge instrument also comprises the transformer (6) be connected between battery pack positive and negative electrode, the primary circuit of transformer (6) is connected with battery pack and this primary circuit is connected with the transformer metal-oxide-semiconductor (7) for controlling its break-make, the secondary circuit of current transformer (2) being connected with the PWM unit (8) for driving above-mentioned transformer metal-oxide-semiconductor (7), the secondary circuit of transformer (6) being connected with the radiator fan (9) for lowering the temperature to PTC thermistor (4).

2. battery discharging instrument as claimed in claim 1, is characterized in that described radiator fan (9) comprises in parallel multiple, and radiator fan (9) and both one_to_one corresponding equal with the quantity of PTC thermistor (4) are arranged.

3. battery discharging instrument as claimed in claim 1, the secondary circuit that it is characterized in that described transformer (6) is connected with fast recovery rectifier diode (10).

4. battery discharging instrument as claimed in claim 1, the secondary circuit that it is characterized in that described transformer (6) is connected with filter capacitor (11).

5. battery discharging instrument as claimed in claim 1, is characterized in that described single-chip microcomputer (1) is connected with communication interface unit (12).

6. battery discharging instrument as claimed in claim 1, is characterized in that described single-chip microcomputer (1) is connected with keyboard display unit (13).