CN203039414U - Program-controlled pulse compensation type charger - Google Patents

Abstract

The utility model discloses a program-controlled pulse compensation type charger. A power supply unit converts alternating current into direct current and outputs the direct current to supply power to and charge a battery. A control unit in the power supply unit, according to a voltage value feedbacked by a photoelectric coupling unit, performs pulse width control on a switching switch, and further controls signal pulse width input into an input end of a transformer and regulate output pulse width of the transformer so as to supply power to different loads. A charging control unit controls the entire charging state through a microprocessor, and through magnitude of current sampling and duration of charging, detects a current state of the charging of the battery, and according to charging state switching signals, performs switching of constant current charging and pulse charging. Therefore, according to the charger, the charging can be precisely controlled, and service life of the battery can be prolonged.

Description

A Program-controlled Pulse Compensation Charger

technical field

The utility model relates to a charger, in particular to a lead-acid battery charger for an electric vehicle.

Background technique

At present, most of the chargers used for lead-acid batteries in electric vehicles adopt constant-current charging and three-stage charging. Constant-current charging is to keep the current constant to charge the lead-acid battery; three-stage charging is divided into three stages. One stage is the constant current stage, the second stage is the constant voltage stage, and the third stage is the trickle stage; even there are a lot of constant power chargers on the market, these chargers do not have a stable charging mode, and often appear The phenomenon that the battery is fully charged or damaged will cause the battery to vulcanize, reduce the activity of the battery electrolyte, and shorten the life of the battery. Great inconvenience. the

Utility model content

The utility model aims to provide a program-controlled pulse compensation charger which can accurately control charging and prolong battery life.

The program-controlled pulse compensation type charger described in the utility model includes:

The power supply unit is used to convert AC power into DC power output, and it is provided with a control unit connected to a transformer and a switch. The control unit controls the pulse width of the switch according to the voltage value fed back by the photocoupler unit connected to it. Then control the signal pulse width in the input terminal of the input transformer, adjust the output pulse width of the transformer to supply power to different loads, the voltage value fed back by the photoelectric coupling unit is connected to the integrated operational amplifier by sampling the voltage and the reference voltage The output voltage value after comparison and shaping;

The microprocessor of the charging control unit controls the charging state by judging the magnitude of the current sampling, and the microprocessor controls the switch of the pulse charging unit by sending positive and negative pulse control signals.

The program-controlled pulse compensation charger described in the utility model converts the AC power into a DC power output through the power supply unit to charge and supply the battery, wherein the control unit in the power supply unit is based on the voltage value fed back by the photoelectric coupling unit. The switching switch performs pulse width control, and then controls the signal pulse width input to the input terminal of the transformer, and adjusts the output pulse width of the transformer to supply power to different loads. The charging control unit controls the entire charging state through a microprocessor, and through current sampling The size and charging time, detect the current charging state of the battery, and switch between constant current charging and pulse charging according to the charging state switching signal.

Description of drawings

Fig. 1 is a functional block diagram of the utility model.

Fig. 2 is the circuit diagram of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described further.

As shown in Figure 1-2, a program-controlled pulse compensation type charger, its power supply unit converts AC power into DC power output, it is equipped with a control unit 3 connected to the transformer 1 and switch 2, the control unit 3 is connected to it according to the The voltage value fed back by the photoelectric coupling 4 unit controls the pulse width of the switch 2, and then controls the signal pulse width input to the input terminal of the transformer 1, and adjusts the output pulse width of the transformer 1 to supply power to different loads. The voltage value fed back by the coupling unit 4 is the voltage value output by the integrated operational amplifier 5 connected to it by comparing the voltage sample with the reference voltage 6 and shaping it; the microprocessor in the charging control unit judges the size of the current sample, To control the charging state, the microprocessor controls the switch of the pulse charging unit by sending positive and negative pulse control signals. The power supply unit also includes rectification and filtering, which converts the input AC power into DC power through rectification and filtering.

A soft start circuit is connected between the transformer and the control unit, and the control unit is started when the voltage is stable. An overload sampling unit is connected between the changeover switch and the control unit, and when the current is overloaded, the output of the load current is reduced by controlling the changeover switch.

Claims (4)

1. A program-controlled pulse compensation type charger, characterized in that, comprising: The power supply unit is used to convert the AC power into a DC power output, and it is provided with a control unit connected to the transformer and the switching switch. The control unit controls the pulse width of the switching switch according to the voltage value fed back by the photocoupling unit connected to it. Then control the signal pulse width in the input terminal of the input transformer, adjust the output pulse width of the transformer to supply power to different loads, the voltage value fed back by the photoelectric coupling unit is connected to the integrated operational amplifier by sampling the voltage and the reference voltage The output voltage value after comparison and shaping; The microprocessor of the charging control unit controls the charging state by judging the magnitude of the current sampling, and the microprocessor controls the switch of the pulse charging unit by sending positive and negative pulse control signals. 2. A program-controlled pulse compensation charger according to claim 1, wherein the power supply unit further includes rectification and filtering, which converts the input AC power into DC power through rectification and filtering. 3. A program-controlled pulse-compensated charger according to claim 1, wherein a soft-start circuit is connected between the transformer and the control unit, and the control unit is started when the voltage is stable. 4. A program-controlled pulse compensation charger according to claim 1, characterized in that: an overload sampling unit is connected between the switch and the control unit, and when the current is overloaded, the load can be reduced by controlling the switch current output.

Images