CN217848969U

CN217848969U - Lead-acid battery charging circuit with floating charging function

Info

Publication number: CN217848969U
Application number: CN202123274980.9U
Authority: CN
Inventors: 田川川; 于廷华; 方建超; 叶海水
Original assignee: Qingdao Richmat Intelligence Technology Inc
Current assignee: Qingdao Richmat Intelligence Technology Inc
Priority date: 2021-12-18
Filing date: 2021-12-18
Publication date: 2022-11-18
Anticipated expiration: 2031-12-18

Abstract

The utility model relates to a lead acid battery field specifically is a lead acid battery charging circuit of function is filled to area floating, including power supply, battery, the detection circuit that charges, switch circuit, switch lock circuit, the constant current circuit that charges, current detection circuit, current signal filter circuit, current detection arithmetic circuit, power supply circuit, constant voltage and float and fill feedback circuit, power conversion circuit and power input circuit, the utility model discloses when using, when the battery fills 28.8V and charging current and descends to 0.2C ~ 0.3C 2, current detection arithmetic circuit control Q5 by U2 group turns off, and Q4 is opened, and the battery is charged to battery floating charge voltage with charging voltage constant voltage, restores the charge buffering of battery, improves the life of battery, through set up current signal filter circuit between the constant current circuit that charges and current detection circuit, improves the precision that current detection circuit detected.

Description

Lead-acid battery charging circuit with floating charging function

Technical Field

The utility model relates to a lead acid battery field specifically is a lead acid battery charging circuit of function is filled to area floating.

Background

The chips for charging the single 12V lead-acid batteries are arranged on the market, and because the control system of the company is applied to a 24V motor control system, but the chips for charging two 12V single lead-acid batteries in series are fewer, and the input voltage is lower than the application of the electric control system of the company, the cost of the charging chip for the imported TI lead-acid batteries is high, the delivery period is long, the purchase of materials is difficult,

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model provides a lead-acid battery charging circuit of function is floated in area with low costs, easily purchase to the not enough of prior art.

(II) technical scheme

In order to achieve the above object, the utility model provides a following technical scheme: a lead-acid battery charging circuit with a floating charging function comprises a power supply, a battery, a charging detection circuit, a switch lock circuit, a charging constant-current circuit, a current detection circuit, a current signal filter circuit, a current detection operation circuit, a power supply circuit, a constant-voltage and floating charging feedback circuit, a power conversion circuit and a power input circuit, wherein an output interface of the power supply is connected with an input end of the charging detection circuit, an output end of the charging circuit is connected with an input end of the switch circuit, an output end of the switch circuit is connected with an input end of the power conversion circuit, an output end of the power conversion circuit is connected with an input end of the charging constant-current circuit, an output end of the charging constant-current circuit is connected with an input end of the current detection circuit, an output end of the current detection circuit is connected with an input end of the input circuit, an output end of the input circuit is connected with an input interface of the battery, a detection end of the current detection circuit is connected with a detection interface of the battery, a first control end of the current detection operation circuit is connected with an input end of the constant-voltage and floating charging feedback circuit, an output end of the constant-voltage and floating charging circuit is connected with a control operation circuit, a second control circuit, and a switch lock control output end of the switch lock circuit is connected with the power supply circuit, and a power supply circuit.

For the stability of charging, the utility model discloses the improvement has, switch circuit includes Q2/R3/R6D 3/Q3/R8/R10 and R13, the switch lock circuit includes U3/R17/R21/R22/C7/R18/R19/D5 and C6, the constant current circuit that charges includes RS1/R1/Q1 and R4, the current detection circuit includes RS2/U1/C1 and R25, current detection arithmetic circuit includes U2/C3// C4/C5/R15/R23/R20/R26 and R27, the power supply circuit includes D4 and C2, constant voltage and float and fill feedback circuit including Q4/Q5/R2/R5/R9/R11/R12/R7/R14 and R16, power input circuit is D1, power conversion circuit is DC.

In order to improve the conductive stability of the battery Input interface and the output interface of the Power supply, the output interface of the Power supply is a Power _ Input interface, and the Input interface of the battery is a VBAT interface.

In order to improve the current input effect, the charging detection circuit is used for detecting whether current is generated or not, and the switch circuit controls Q2 to be opened and connected with the power conversion circuit.

In order to buffer the charging current, the electric quantity of the battery is 28.8V, and when the charging current of the current detection circuit drops to 0.2-0.3C/2, the U2 of the current detection operation circuit controls the constant voltage and the Q5 of the floating charge feedback circuit to be switched off, and the Q4 is switched on.

In order to realize the automatic power-off protection after the battery is fully charged, the electric quantity of the battery is 28.8V, and when the charging current of the current detection circuit is reduced to 0.2-0.3C/2, the U2 of the battery detection operation circuit controls the Q5 of the constant voltage and floating charge feedback circuit to be turned off, and the Q4 is turned on.

In order to improve the detection accuracy of the current detection circuit, a current signal filter circuit is arranged at the joint of the charging constant current circuit and the current detection circuit.

(III) advantageous effects

Compared with the prior art, the utility model provides a lead acid battery charging circuit of function is filled to area floating possesses following beneficial effect:

the utility model discloses when using, when the battery fills 28.8V and charging current descends to 0.2C ~ 0.3C 2, the current detection operational circuit control Q5 of constituteing by U2 turns off, Q4 is opened, charge voltage constant voltage to battery float charge voltage for battery charging, buffer to the charging of battery is restoreed, the life of battery is improved, through set up current signal filter circuit between charging constant current circuit and current detection circuit, the accurate nature that improves current detection circuit and detect.

Drawings

FIG. 1 is a schematic circuit diagram of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the present invention relates to a lead-acid battery charging circuit with a floating charge function, including a power supply, a battery, a charge detection circuit, a switch lock circuit, a charge constant current circuit, a current detection circuit, a current signal filter circuit, a current detection operation circuit, a power supply circuit, a constant voltage and floating charge feedback circuit, a power conversion circuit and a power input circuit, wherein an output interface of the power supply is connected to an input end of the charge detection circuit, an output end of the charge circuit is connected to an input end of the switch circuit, an output end of the switch circuit is connected to an input end of the power conversion circuit, an output end of the power conversion circuit is connected to an input end of the charge constant current circuit, an output end of the charge constant current circuit is connected to an input end of the current detection circuit, an output end of the current detection operation circuit is connected to an input end of the current detection circuit, an output end of the constant voltage and floating charge feedback circuit is connected to an input end of the charge control circuit, and a second control circuit is connected to an input end of the power supply control circuit, and a switch lock circuit.

In this embodiment, the switch circuit includes Q2/R3/R6/D3/Q3/R8/R10 and R13, the switch lock circuit includes U3/R17/R21/R22/C7/R18/R19/D5 and C6, the charging constant current circuit includes RS1/R1/Q1 and R4, the current detection circuit includes RS2/U1/C1 and R25, the current detection operation circuit includes U2/C3// C4/C5/R15/R23/R20/R26 and R27, the power supply circuit includes D4 and C2, the constant voltage and float charge feedback circuit includes Q4/Q5/R2/R5/R9/R11/R12/R7/R14 and R16, the power input circuit is D1, and the power conversion circuit is DC, and the charging stability is ensured by using various electronic components.

In this embodiment, power supply's output interface is Power _ Input interface, the Input interface of battery is the VBAT interface, improves battery Input interface and Power supply's output interface's conductive stability, guarantees charge efficiency.

In this embodiment, the charging detection circuit is configured to detect whether a current is generated, and when the current detection circuit does not detect a current, the switching circuit controls the Q2 to be turned on to be connected to the power conversion circuit, and the power supply is kept at a constant voltage of 29.2V through the DC power conversion circuit, thereby ensuring stability of the charging current.

In this embodiment, the electric quantity of the battery is 28.8V, and when the charging current of the current detection circuit drops to 0.2C-0.3C/2, the U2 of the current detection and operation circuit controls the constant voltage and Q5 of the float charge feedback circuit to turn off, and Q4 to turn on, so as to charge the battery by the constant voltage of the charging voltage to the battery float charge voltage, and the charging buffer of the battery is repaired, thereby prolonging the service life of the battery.

In this embodiment, a current signal filter circuit is arranged at a connection position of the charging constant current circuit and the current detection circuit, so that the detection accuracy of the current detection circuit is improved.

To sum up, when the lead-acid battery charging circuit with the floating charging function is used, a battery is connected on a VBAT interface, then a Power supply is connected into a Power supply from a Power _ Input interface, when the charging detection circuit does not detect current, a switch circuit composed of Q2 is automatically turned on, the Power supply is subjected to constant voltage to 29.2V through a DC Power supply conversion circuit, the constant current is constant at 0.2C-0.3C through a constant current circuit composed of RS1, and then the battery is charged through D1 through a current detection circuit composed of RS 2;

when the battery is charged to 28.8V and the charging current is reduced to 0.2-0.3C/2, a current detection operation circuit consisting of U2 controls Q5 to be turned off and Q4 to be turned on, and the charging voltage is constant to the floating charging voltage of the battery to charge the battery;

when the current detection circuit detects that the float charging current of the battery is less than 10mA, the current detection operation circuit controls a switch lock circuit consisting of U3 to switch off Q2 of the switch circuit, the circuit stops charging, the battery finishes charging and can cut off power supply;

when the battery is used up, the power supply is connected and the cycle is entered to charge the battery.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A lead-acid battery charging circuit with a floating charging function is characterized by comprising a power supply, a battery, a charging detection circuit, a switch lock circuit, a charging constant-current circuit, a current detection circuit, a current signal filter circuit, a current detection operation circuit, a power supply circuit, a constant voltage and floating charging feedback circuit, a power conversion circuit and a power input circuit, wherein an output interface of the power supply is connected with an input end of the charging detection circuit, an output end of the charging circuit is connected with an input end of the switch circuit, an output end of the switch circuit is connected with an input end of the power conversion circuit, an output end of the power conversion circuit is connected with an input end of the charging constant-current circuit, an output end of the charging constant-current circuit is connected with an input end of the current detection circuit, an output end of the current detection circuit is connected with an input end of the current detection circuit, an output end of the constant voltage and floating charging feedback circuit is connected with a control end of the charging circuit, a detection end of the current detection operation circuit is connected with a detection interface of the battery, a first control end of the current detection operation circuit is connected with an input end of the constant-current detection circuit, and a switch lock circuit is connected with an output end of the constant-current detection circuit, and a switch lock control circuit is connected with an input end of the power supply control circuit.

2. The charging circuit of claim 1, wherein the switch circuit comprises Q2/R3/R6/D3/Q3/R8/R10 and R13, the switch lock circuit comprises U3/R17/R21/R22/C7/R18/R19/D5 and C6, the charging constant current circuit comprises RS1/R1/Q1 and R4, the current detection circuit comprises RS2/U1/C1 and R25, the current detection operation circuit comprises U2/C3// C4/C5/R15/R23/R20/R26 and R27, the power supply circuit comprises D4 and C2, the constant voltage and float feedback circuit comprises Q4/Q5/R2/R5/R9/R11/R12/R7/R14 and R16, the power input circuit is D1, and the power conversion circuit is DC.

3. The lead-acid battery charging circuit with the float function according to claim 2, wherein the output interface of the Power supply is a Power _ Input interface, and the Input interface of the battery is a VBAT interface.

4. The lead-acid battery charging circuit with the float charging function according to claim 3, wherein the charging detection circuit is used for detecting whether current is generated or not, and the switching circuit controls Q2 to be opened to be connected with the power conversion circuit.

5. The lead-acid battery charging circuit with the float charging function according to claim 4, wherein the electric quantity of the battery is 28.8V, and when the charging current of the current detection circuit drops to 0.2C-0.3C/2, the U2 of the current detection and operation circuit controls the constant voltage and Q5 of the float feedback circuit to be turned off, and Q4 is turned on.

6. The lead-acid battery charging circuit with the float charging function according to claim 5, wherein when the current of the current detection circuit is less than 10mA, the current detection operation circuit controls U3 of the switch lock circuit to turn off Q2 of the switch circuit.

7. The lead-acid battery charging circuit with the float charging function according to claim 5, wherein a current signal filter circuit is arranged at the connection position of the charging constant current circuit and the current detection circuit.