CN213693185U - Battery management circuit with constant voltage charging function - Google Patents
Battery management circuit with constant voltage charging function Download PDFInfo
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- CN213693185U CN213693185U CN202022453885.4U CN202022453885U CN213693185U CN 213693185 U CN213693185 U CN 213693185U CN 202022453885 U CN202022453885 U CN 202022453885U CN 213693185 U CN213693185 U CN 213693185U
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Abstract
The utility model discloses a battery management circuit with constant voltage function of charging, it includes: a control module; the charging circuit comprises a power management module, a filtering module and a switch module which are connected in sequence; the filtering module filters the voltage output by the power management module, the output end of the filtering module is also connected with a voltage division feedback circuit, and the output end of the voltage division feedback circuit is connected with the feedback end of the power management module; the output end of the switch module is connected with the anode of the battery through a current-limiting resistor and a reverse-flow prevention diode, and the cathode of the battery is connected with the common end; the switch module comprises a first switch transistor and a drive circuit, and the control end of the drive circuit is connected with the control module; the control module controls whether the output end of the filtering module charges the battery or not by controlling the connection and disconnection between the source electrode and the drain electrode of the first switching transistor driven by the driving circuit. The circuit has small charging current at the final charging stage, and can prevent overcharge.
Description
Technical Field
The utility model relates to the field of electronic technology, concretely relates to battery management circuit with constant voltage function of charging.
Background
In emergency lighting equipment, a mode of combining a direct current power supply and an alternating current commercial power supply is required to supply power to a load. The dc power supply is usually supplied by a lithium battery. In the process of charging the lithium battery, in order to ensure the safety of the battery and avoid the expansion of the battery caused by gas precipitation due to overlarge charging current, a constant-current charging mode needs to be adopted. However, the constant current circuit has a complicated structure and high cost, and the charging current needs to be reduced at the final stage of charging to prevent the excessive charging voltage from causing the overcharge of the battery.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a battery management circuit with constant voltage function of charging according to the weak point of above-mentioned prior art, this circuit adopts the mode of constant voltage to charge to the battery to adopt the small resistance to restrict charging current, solved the problem that exists among the constant current charging mode.
The utility model discloses the purpose is realized accomplishing by following technical scheme:
a battery management circuit having a constant voltage charging function, comprising:
a control module;
a battery;
the charging circuit comprises a power management module, a filtering module and a switch module which are connected in sequence; the filtering module filters the voltage output by the power management module, the output end of the filtering module is also connected with a voltage division feedback circuit, and the output end of the voltage division feedback circuit is connected with the feedback end of the power management module; the output end of the switch module is connected with the anode of the battery through a current-limiting resistor and a reverse-flow prevention diode, and the cathode of the battery is connected with a common end;
the positive electrode of the battery is also connected with an AD feedback circuit; the input end of one ADC in the control module is connected with the output end of the AD feedback circuit, and the control module detects the output voltage of the battery through the AD feedback circuit;
the switch module comprises a first switch transistor and a drive circuit, and the control end of the drive circuit is connected with the control module; the control module controls whether the output end of the filtering module charges the battery or not by controlling the drive circuit to drive the connection and disconnection between the source electrode and the drain electrode of the first switching transistor.
The utility model discloses a further improvement lies in: an inductor is connected between the input end and the output end of the filtering module; the input end of the filter module is connected with the cathode of the first diode and is connected with the output end of the power management module; the anode of the first diode is connected with the common end; and the output end of the filtering module is connected with the common end through a second capacitor.
The utility model discloses a further improvement lies in: the voltage division feedback circuit comprises a first resistor, a second resistor and a first capacitor; the first resistor is connected between the output end and the common end of the voltage division feedback circuit; the second resistor is connected between the output end of the filtering module and the output end of the voltage division feedback circuit; the first capacitor is connected in parallel with the second resistor.
The utility model discloses a further improvement lies in: the source electrode of a first switch transistor of the switch module is connected with the output end of the filter module, and the drain electrode of the first switch transistor of the switch module is connected with the current-limiting resistor; the drive circuit is connected to the gate of the first switching transistor.
The utility model discloses a further improvement lies in: the current limiting resistor comprises a plurality of low-resistance resistors which are connected in series; the current limiting resistor is connected with the anode of the anti-reflux diode; the cathode of the anti-reflux diode is connected with the anode of the battery through a fuse.
The utility model discloses a further improvement lies in: a discharge control module is connected between the battery and the load; and the control end of the discharge control module is connected with the control module.
The utility model has the advantages that: the method has the advantages that the current is slightly large in the initial charging stage, the current is gradually reduced along with the time, only a small current passes through the charging terminal stage, the current does not need to be adjusted in the mode, the method is simple to use, the charging current is automatically reduced, gas is less separated out in the charging process, the charging time is short, the energy consumption is low, and the charging efficiency is high. And the charging is resumed and the charging is not performed, so that the battery can be prevented from being overcharged.
Drawings
Fig. 1 is a schematic diagram of a battery management circuit having a constant voltage charging function;
fig. 2 is a schematic diagram of a discharge control module.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example with reference to the accompanying drawings, for the understanding of those skilled in the art:
example (b): as shown in fig. 1, an embodiment of the present invention includes a battery management circuit having a constant voltage charging function, which includes: a control module (not shown), a battery BAT, and a charging circuit. The charging circuit comprises a power management module U1, a filtering module 10 and a switch module 20 which are connected in sequence.
The power management module U1 is used to chop the input voltage and output the PWM voltage through the output terminal OUT. The input end of the filtering module 10 is connected to the output end, and is used for filtering the PWM voltage, and the filtered filtering module 10 outputs a dc voltage for charging the battery BAT.
In a specific embodiment, an inductor L1 is connected between the input terminal and the output terminal of the filtering module 10; the input terminal of the filtering module 10 is connected to the cathode of the first diode D1 and to the output terminal OUT of the power management module U1. The anode of the first diode D1 is connected to the common terminal D1. The output terminal of the filtering module 10 is connected to the common terminal GND through a second capacitor C2.
The output end of the filtering module 10 is further connected to a voltage division feedback circuit 30, and the output end of the voltage division feedback circuit 30 is connected to the feedback end FB of the power management module U1. In this embodiment, the voltage division feedback circuit 30 includes a first resistor R1, a second resistor R2, and a first capacitor C1. The first resistor R1 is connected between the output terminal of the voltage division feedback circuit 30 and the common terminal GND. The second resistor R2 is connected between the output terminal of the filter module 10 and the output terminal of the voltage division feedback circuit 30. The first capacitor C1 is connected in parallel with the second resistor R2 to filter out noise.
In one embodiment, the filtering module 10 needs to output a voltage of 24V, and the reference voltage of the feedback terminal FB of the power management module U1 is 1.2V, so in this embodiment, the first resistor R1 is 1k Ω, and the second resistor R2 is 19k Ω. The power management module U1 compares the voltage received by the feedback terminal FB with the reference voltage, and performs negative feedback adjustment on the duty ratio of the PWM voltage output by the power management module U1.
The circuit structure can charge the battery at constant voltage. The method has the advantages that the current is slightly large in the initial charging stage, the current is gradually reduced along with the time, only a small current passes through the charging terminal stage, the current does not need to be adjusted in the mode, the method is simple to use, the charging current is automatically reduced, gas is less separated out in the charging process, the charging time is short, the energy consumption is low, and the charging efficiency is high. And the charging is resumed and the charging is not performed, so that the battery can be prevented from being overcharged.
The control module may control whether to charge the battery through the switch module 20. The switching module 20 includes a first switching transistor Q1 and a driving circuit. The source of the first switching transistor Q1 of the switching module 20 is connected to the output of the filtering module 10, and the drain is connected to the current limiting resistor. The drive circuit is connected to the gate of the first switching transistor. And the control end Charge of the driving circuit is connected with a corresponding pin of the control module. The control module controls whether the output terminal of the filter module 10 charges the battery BAT by controlling the driving circuit to drive the connection and disconnection between the source and the drain of the first switching transistor Q1. When the first switching transistor Q1 is turned on, the battery BAT is charged, and when the first switching transistor Q1 is turned off, the charging of the battery BAT is stopped. In this embodiment, the driving circuit of the first switching transistor Q1 is a common base amplifier.
The output end of the switch module 20 is connected to the positive electrode of the battery BAT through a current-limiting resistor and a reverse-flow prevention diode D2, and the negative electrode of the battery BAT is connected to the common terminal GND. In this embodiment, the current limiting resistor includes a plurality of low-resistance resistors R3, R4, R5, R8, R9, and R10 connected in series. The current limiting resistor has the function of avoiding overlarge charging current, and the reason for connecting a plurality of small resistors in series is that the heat dissipation capacity of a single resistor is limited, and the heat dissipation requirement and the grade of a device can be reduced by adopting a plurality of resistors in series. The current limiting resistor is connected to the anode of the backflow prevention diode D2. The cathode of the backflow prevention diode D2 is connected to the positive electrode of the battery BAT through a fuse.
In this embodiment, the positive electrode of battery BAT is further connected to AD feedback circuit 40. The input of one ADC in the control module is connected to the output AD _ BAT of the AD feedback circuit 40. The control module detects the output voltage of the battery through the AD feedback circuit 40. In one embodiment, the AD feedback circuit 40 is a resistor-capacitor network with voltage dividing and filtering functions.
As shown in fig. 1 and 2, a discharge control module is connected between the battery BAT and the Load. And a control end Bat _ Work of the discharge control module is connected with a corresponding pin of the control module. In this embodiment, the circuit of the discharge control module is the same as the principle of the switch module 20. When the control end Bat _ Work is at a high level, the battery BAT supplies power to the load, otherwise, the discharge control module is switched off, and the battery stops supplying power to the load.
In this embodiment, the control module controls whether to discharge the battery BAT according to the output voltage of the battery BAT. Specifically, when the voltage of the battery BAT drops to 20V, indicating that the battery BAT is exhausted, the discharge control module is turned off and the switch module 20 is turned on to charge the battery. When the voltage of the battery BAT rises to 24V, indicating that the charging thereof is completed, the open control module is turned on and the switch module 20 is turned off, so that the battery supplies power to the load.
In this embodiment, the control module may be implemented by using an MCU or a PLC. The power management module U1 is implemented by using an LM2596 chip.
The above embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A battery management circuit having a constant voltage charging function, comprising:
a control module;
a battery;
the charging circuit comprises a power management module, a filtering module and a switch module which are connected in sequence; the filtering module filters the voltage output by the power management module, the output end of the filtering module is also connected with a voltage division feedback circuit, and the output end of the voltage division feedback circuit is connected with the feedback end of the power management module; the output end of the switch module is connected with the anode of the battery through a current-limiting resistor and a reverse-flow prevention diode, and the cathode of the battery is connected with a common end;
the positive electrode of the battery is also connected with an AD feedback circuit; the input end of one ADC in the control module is connected with the output end of the AD feedback circuit, and the control module detects the output voltage of the battery through the AD feedback circuit;
the switch module comprises a first switch transistor and a drive circuit, and the control end of the drive circuit is connected with the control module; the control module controls whether the output end of the filtering module charges the battery or not by controlling the drive circuit to drive the connection and disconnection between the source electrode and the drain electrode of the first switching transistor.
2. A battery management circuit having a constant voltage charging function according to claim 1, wherein; an inductor is connected between the input end and the output end of the filtering module; the input end of the filter module is connected with the cathode of the first diode and is connected with the output end of the power management module; the anode of the first diode is connected with the common end; and the output end of the filtering module is connected with the common end through a second capacitor.
3. A battery management circuit having a constant voltage charging function according to claim 1, wherein; the voltage division feedback circuit comprises a first resistor, a second resistor and a first capacitor; the first resistor is connected between the output end and the common end of the voltage division feedback circuit; the second resistor is connected between the output end of the filtering module and the output end of the voltage division feedback circuit; the first capacitor is connected in parallel with the second resistor.
4. A battery management circuit having a constant voltage charging function according to claim 1, wherein; the source electrode of a first switch transistor of the switch module is connected with the output end of the filter module, and the drain electrode of the first switch transistor of the switch module is connected with the current-limiting resistor; the drive circuit is connected to the gate of the first switching transistor.
5. The battery management circuit with a constant voltage charging function according to claim 1, wherein: the current limiting resistor comprises a plurality of low-resistance resistors which are connected in series; the current limiting resistor is connected with the anode of the anti-reflux diode; the cathode of the anti-reflux diode is connected with the anode of the battery through a fuse.
6. The battery management circuit with a constant voltage charging function according to claim 1, wherein: a discharge control module is connected between the battery and the load; and the control end of the discharge control module is connected with the control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022453885.4U CN213693185U (en) | 2020-10-29 | 2020-10-29 | Battery management circuit with constant voltage charging function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022453885.4U CN213693185U (en) | 2020-10-29 | 2020-10-29 | Battery management circuit with constant voltage charging function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213693185U true CN213693185U (en) | 2021-07-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202022453885.4U Active CN213693185U (en) | 2020-10-29 | 2020-10-29 | Battery management circuit with constant voltage charging function |
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|---|---|
| CN (1) | CN213693185U (en) |
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2020
- 2020-10-29 CN CN202022453885.4U patent/CN213693185U/en active Active
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