CN104600820B - Lead-acid cell quick charge control circuit - Google Patents

Abstract

The lead-acid battery fast charging control circuit of the present invention includes a power supply, a rectification filter circuit, a first step-up/down module, a second step-up/down module, a lead-acid battery, a pulse trigger circuit, a first comparator, and a second comparator , Switching circuit and MOS tube. The fast charging control circuit of the lead-acid battery of the present invention can control the charging of the lead-acid battery, that is, when the lead-acid battery needs to be charged, the fast charging mode is turned on, and when the lead-acid battery is full, the fast charging mode is turned off and enters the float charging mode.

Description

Lead-acid battery fast charging control circuit

technical field

The invention relates to a control circuit, in particular to a fast charging control circuit for a lead-acid battery.

Background technique

Generally, the charging of lead-acid batteries is uncontrollable, and the charging process is constant; when the lead-acid battery is fully charged, if it is still charged continuously with a large current, the service life of the lead-acid battery will be greatly reduced, and some unpredictable failures may occur.

Contents of the invention

The object of the present invention is to provide a fast charging control circuit for lead-acid batteries that is simple, controllable, safe and stable.

In order to solve the above technical problems, the lead-acid battery fast charging control circuit of the present invention includes a power supply, a rectification filter circuit, a first step-up/down module, a second step-up/down module, a lead-acid battery, a pulse trigger circuit, and a first comparison device, a second comparator, a switch circuit and a MOS tube; wherein the output terminal V1 of the first step-up/down module is grounded through the first resistor R1 and the first regulator tube D1, and the anode of the first comparator is connected to Between the first resistor R1 and the first regulator tube D1; the pulse output pin of the pulse trigger circuit is connected to the negative pole of the first comparator; the output pin of the first comparator is connected to the negative pole of the first comparator The gate of the MOS transistor is connected; the output voltage terminal V2 of the second step-up/down module, the fifth resistor R5 and the third regulator tube D3 are digitally grounded, and the anode of the second comparator is connected to the Between the fifth resistor R5 and the third regulator tube D3; the negative pole of the lead-acid battery connection terminal is connected to the digital ground; the positive pole of the lead-acid battery connection terminal is digitally grounded through the sixth resistor R6 and the variable resistor R7, The negative electrode of the second comparator is connected to the variable end of the variable resistor R7; the output pin of the second comparator is connected to the input part of the switch circuit, and the output voltage of the switch circuit is given to the first The comparator is powered; the drain of the MOS transistor is digitally grounded, and the source of the MOS transistor is grounded. The power supply is alternating current.

The fast charging control circuit of the lead-acid battery of the present invention can control the charging of the lead-acid battery, that is, when the lead-acid battery needs to be charged, the fast charging mode is turned on, and when the lead-acid battery is full, the fast charging mode is turned off and enters the float charging mode.

Description of drawings

Fig. 1 is the principle diagram of the fast charging control circuit of the lead-acid battery of the present invention.

Explanation of reference signs in the accompanying drawings of the lead-acid battery fast charging control circuit of the present invention:

1-power supply 2-rectifier filter circuit 3-the first step-up/down module

4-The second step-up/down module 5-Lead-acid battery 6-Pulse trigger circuit

7-First comparator 8-Second comparator 9-Switch circuit

detailed description

The lead-acid battery fast charging control circuit of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the lead-acid battery fast charging control circuit of the present invention includes an AC power supply 1, a rectification filter circuit 2, a first step-up/down module 3, a second step-up/down module 4, a lead-acid battery 5, a pulse Trigger circuit 6, first comparator 7, second comparator 8, switch circuit 9 and MOS tube.

Do not connect AC and lead-acid battery 5, connect direct current VMAX at the connection end of lead-acid battery 5, the voltage value is the maximum charging voltage of lead-acid battery 5, adjust variable resistor R7 so that V4 is a voltage value; then change the direct current The voltage value is V1 (such as the voltage of the lead-acid battery 5 is 12V, then the value is 11.5V), and the variable resistor R3 is adjusted to make the voltage values of V5 and V4 equal.

Connect AC power and lead-acid battery 5, when the lead-acid battery 5 needs to be charged, that is, the voltage of the lead-acid battery 5 is less than V1, at this time the voltage value of V5 is greater than V4, then the second comparator 8 outputs a positive voltage, and the switch circuit 9 Start to work, the output voltage VCC is used for the first comparator 7; the pulse trigger circuit 6 outputs a pulse input to the negative pole of the first comparator 7 for comparison with the positive pole voltage of the first comparator 7, and at this time the first comparator 7 outputs a pulse to drive MOS tube, then the digital ground is connected to the ground, that is, the negative electrode of the lead-acid battery 5 is grounded, and the lead-acid battery 5 enters the fast charging mode.

When the lead-acid battery 5 is fully charged, that is, the voltage of the lead-acid battery 5 is VMAX, at this time, the voltage of V5 is less than V4, the output voltage of the second comparator 8 is 0, and the switching circuit 9 stops working, that is, the output voltage VCC is 0 , the first comparator 7 does not work, and the MOS tube is not turned on. The negative pole of the lead-acid battery 5 is connected to the ground GND through a diode and a resistor. At this time, the charging current is small, and the fast charging mode ends, that is, it enters the float charging mode. Wherein the main chip of the pulse trigger circuit 6 is the NE555 chip.

The fast charging control circuit of the lead-acid battery of the present invention can control the charging of the lead-acid battery, that is, when the lead-acid battery needs to be charged, the fast charging mode is turned on, and when the lead-acid battery is full, the fast charging mode is turned off and enters the float charging mode.

The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the described embodiments, and those skilled in the art can also make various equivalents without violating the spirit of the present invention. Modifications or replacements, these equivalent modifications or replacements are all included within the scope defined by the claims of the present application.

Claims (2)

1. The lead-acid battery rapid charging control circuit is characterized in that it includes a power supply, a rectification filter circuit, a first step-up/down module, a second step-up/down module, a lead-acid battery, a pulse trigger circuit, a first comparator, The second comparator, switch circuit and MOS tube; wherein The output terminal V1 of the first step-up/down module is grounded through the first resistor R1 and the first regulator tube D1, and the anode of the first comparator is connected to the first resistor R1 and the first regulator tube D1. between pipe D1; The pulse output pin of the pulse trigger circuit is connected to the negative pole of the first comparator; The output pin of the first comparator is connected to the gate of the MOS transistor; The output voltage terminal V2 of the second step-up/down module is digitally grounded through the fifth resistor R5 and the third regulator tube D3, and the anode of the second comparator is connected to the fifth resistor R5 and the third Between the regulator tube D3; The positive pole of the connection terminal of the lead-acid battery is digitally grounded through the sixth resistor R6 and the variable resistor R7, and the negative pole of the second comparator is connected to the variable terminal of the variable resistor R7; The negative terminal of the lead-acid battery is connected to the digital ground; The output pin of the second comparator is connected to the input part of the switch circuit, and the output voltage of the switch circuit supplies power to the first comparator; The drain of the MOS transistor is digitally grounded, and the source of the MOS transistor is grounded. 2. The lead-acid battery fast charging control circuit according to claim 1, wherein the power supply is an alternating current.