CN117394504A - Storage battery charging circuit and device - Google Patents

Storage battery charging circuit and device Download PDF

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Publication number
CN117394504A
CN117394504A CN202311685719.9A CN202311685719A CN117394504A CN 117394504 A CN117394504 A CN 117394504A CN 202311685719 A CN202311685719 A CN 202311685719A CN 117394504 A CN117394504 A CN 117394504A
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China
Prior art keywords
power
energy storage
voltage
module
mos tube
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Granted
Application number
CN202311685719.9A
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Chinese (zh)
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CN117394504B (en
Inventor
李微
林木松
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Pluckystone Technologies Co ltd
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Pluckystone Technologies Co ltd
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Priority to CN202311685719.9A priority Critical patent/CN117394504B/en
Publication of CN117394504A publication Critical patent/CN117394504A/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to the technical field of electronic circuits and discloses a storage battery charging circuit and a storage battery charging device, wherein the circuit collects the loop voltage of a charging loop through a detection module and detects whether the loop voltage is larger than a preset voltage threshold value or not; the detection module outputs an energy storage signal to the energy storage module when the loop voltage is greater than a preset voltage threshold; the energy storage module stores energy of the energy storage device according to the energy storage signal, and outputs a power-off signal to the power-off module when the energy storage voltage of the energy storage device reaches a preset energy storage voltage; the power-off module disconnects the charging loop based on a power-off signal. According to the invention, the loop voltage of the charging loop is detected to control the energy storage device to store energy, and the charging loop is disconnected when the energy storage voltage of the energy storage device reaches the preset energy storage voltage.

Description

Storage battery charging circuit and device
Technical Field
The present disclosure relates to electronic circuits, and particularly to a battery charging circuit and apparatus.
Background
Currently, a battery charger needs to be powered off to protect a battery after fully charging the battery. The existing mode is to judge that the charging of the storage battery is completed and disconnect the loop when the collected current is lower than the cut-off current of the storage battery by collecting the current of the charging loop.
However, the above-mentioned mode is because the circuit current is less when the battery is fully charged, can't gather comparatively accurate circuit current, exists to fully charge, but circuit current still is greater than the off-current, can't accurate outage for battery charger continues to consume the electric energy and charges for the battery float, leads to the battery overheat damage.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a storage battery charging circuit and device, and aims to solve the technical problems that the prior art cannot collect accurate loop current, so that the power cannot be accurately cut off, a storage battery charger continuously consumes electric energy to float the storage battery for charging, and the storage battery is overheated and damaged.
To achieve the above object, the present invention provides a battery charging circuit comprising: the device comprises a charging power supply, a detection module, an energy storage module and a power-off module, wherein an energy storage device is arranged in the energy storage module;
the detection module is respectively connected with the negative electrode of the charging power supply, the energy storage module and the negative electrode of the storage battery, the energy storage module is connected with the power-off module, and the power-off module is respectively connected with the positive electrode of the charging power supply and the positive electrode of the storage battery;
wherein the charging power supply, the power-off module and the storage battery form a charging loop;
the detection module is used for collecting the loop voltage of the charging loop and detecting whether the loop voltage is larger than a preset voltage threshold value or not;
the detection module is further configured to output an energy storage signal to the energy storage module when the loop voltage is greater than the preset voltage threshold;
the energy storage module is used for storing energy of the energy storage device according to the energy storage signal, and outputting a power-off signal to the power-off module when the energy storage voltage of the energy storage device reaches a preset energy storage voltage;
the power-off module is used for breaking the charging loop based on the power-off signal.
Optionally, the detection module is further configured to output a discharge signal to the energy storage module when the loop voltage is less than the preset voltage threshold;
the energy storage module is further used for discharging the energy storage device after receiving the discharging signal.
Optionally, the detection module includes: a first operational amplifier and a first resistor;
the non-inverting input end of the first operational amplifier is connected with a first reference source, the inverting input end of the first operational amplifier is respectively connected with the negative electrode of the charging power supply and the first end of the first resistor, and the second end of the first resistor is connected with the negative electrode of the storage battery.
Optionally, the energy storage module includes: the energy storage device comprises a first MOS tube, a second MOS tube, a third MOS tube, a second resistor and a third resistor, wherein the energy storage device is an energy storage capacitor;
the grid electrode of the first MOS tube is connected with the output end of the first operational amplifier, the source electrode of the first MOS tube is connected with the first end of the second resistor, the second end of the second resistor is connected with a first power supply, and the drain electrode of the first MOS tube is connected with the first end of the energy storage capacitor;
the grid electrode of the second MOS tube is connected with the output end of the first operational amplifier, the source electrode of the second MOS tube is connected with the first end of the third resistor, the second end of the third resistor is connected with the second end of the energy storage capacitor, and the drain electrode of the second MOS tube is connected with the drain electrode of the first end of the energy storage capacitor;
the grid electrode of the third MOS tube is connected with the power-off module, the source electrode of the third MOS tube is connected with the first end of the third resistor, and the drain electrode of the third MOS tube is connected with the power-off module.
Optionally, the first MOS transistor is configured to, when receiving the energy storage signal, turn on a capacitor charging loop between the first power supply and the energy storage capacitor, so that the first power supply charges the energy storage capacitor;
and the second MOS tube is used for conducting a capacitor discharging loop between the energy storage capacitor and the third resistor when the discharging signal is received, so that the energy storage capacitor discharges through the third resistor.
Optionally, the power-off module includes: the device comprises a power-off starting unit, a power-off detection unit and a power-off unit;
the power-off detection unit is respectively connected with the power-off starting unit, the power-off unit and the first end of the energy storage capacitor, and the power-off starting unit is respectively connected with the first end of the energy storage capacitor and the grid electrode of the third MOS tube;
the power-off starting unit is used for conducting the capacitor discharging loop through the third MOS tube when the power-off signal is received, so that the energy storage capacitor is discharged through the capacitor discharging loop;
the power-off starting unit is further used for conducting a reference input loop between the power-off detection unit and a second reference source based on the power-off signal, so that the second reference source outputs a preset power-off voltage to the power-off detection unit through the reference input loop;
the power-off detection unit is used for collecting the discharge voltage of the energy storage capacitor and comparing the discharge voltage with the preset power-off voltage;
the power-off detection unit is further configured to output a power-off control signal to the power-off unit when the discharge voltage is less than the preset power-off voltage;
the power-off unit is used for breaking the charging loop based on the power-off control signal.
Optionally, the power-off starting unit includes: the fourth MOS tube, the fourth resistor and the fifth resistor;
the grid electrode of the fourth MOS tube is connected with the first end of the fourth resistor, and the first end of the fourth resistor is connected with the first end of the energy storage capacitor;
the source electrode of the fourth MOS tube is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with a second power supply;
and the drain electrode of the fourth MOS tube is respectively connected with the power-off detection unit and the grid electrode of the third MOS tube.
Optionally, the power outage detection unit includes: the second operational amplifier, the fifth MOS tube and the sixth resistor;
the grid electrode of the fifth MOS tube is connected with the drain electrode of the fourth MOS tube;
the source electrode of the fifth MOS tube is connected with the second reference source;
the drain electrode of the fifth MOS tube is connected with the non-inverting input end of the second operational amplifier, the inverting input end of the second operational amplifier is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the drain electrode of the third MOS tube, and the output end of the second operational amplifier is connected with the power-off unit.
Optionally, the power-off unit includes: the first triode, the relay and the relay normally-closed switch;
the base electrode of the first triode is connected with the output end of the second operational amplifier;
the emitter of the first triode is connected with the negative electrode of the storage battery;
the collector of the first triode is connected with the first end of the relay, the second end of the relay is respectively connected with the positive electrode of the charging power supply and the first end of the normally-closed switch of the relay, and the second end of the normally-closed switch of the relay is connected with the positive electrode of the storage battery.
In addition, to achieve the above object, the present invention also proposes a battery charging device comprising a battery charging circuit as described above.
The invention provides a storage battery charging circuit and a storage battery charging device, wherein the circuit collects the loop voltage of a charging loop through a detection module and detects whether the loop voltage is larger than a preset voltage threshold value or not; the detection module outputs an energy storage signal to the energy storage module when the loop voltage is greater than a preset voltage threshold; the energy storage module stores energy of the energy storage device according to the energy storage signal, and outputs a power-off signal to the power-off module when the energy storage voltage of the energy storage device reaches a preset energy storage voltage; the power-off module disconnects the charging loop based on a power-off signal. According to the invention, the loop voltage of the charging loop is detected to control the energy storage device to store energy, and the charging loop is disconnected when the energy storage voltage of the energy storage device reaches the preset energy storage voltage.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of a battery charging circuit according to the present invention;
FIG. 2 is a schematic circuit diagram of a first embodiment of the battery charging circuit of the present invention;
FIG. 3 is a schematic diagram of a second embodiment of a battery charging circuit according to the present invention;
fig. 4 is a schematic circuit diagram of a second embodiment of the battery charging circuit of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, all embodiments obtained by persons skilled in the art based on the embodiments in the present invention without making creative efforts, belong to the protection scope of the present invention.
It should be noted that the descriptions of "first," "second," etc. in the embodiments of the present invention are for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may explicitly or implicitly include at least one such feature, and further, the technical solutions between the various embodiments may be combined with one another, but must be based on the fact that one of ordinary skill in the art can implement such a combination, and such combination should be considered to be absent or outside the scope of the claimed invention when such combination is inconsistent or otherwise unrealizable.
Referring to fig. 1, fig. 1 is a schematic diagram of a first embodiment of a battery charging circuit according to the present invention.
As shown in fig. 1, in this embodiment, the battery charging circuit includes: the device comprises a charging power supply 100, a detection module 200, an energy storage module 300 and a power-off module 400, wherein an energy storage capacitor is arranged in the energy storage module 300.
The detection module 200 is respectively connected with the negative electrode of the charging power supply 100, the energy storage module 300 and the negative electrode of the storage battery G0, the energy storage module 300 is connected with the power-off module 400, and the power-off module 400 is respectively connected with the positive electrode of the charging power supply 100 and the positive electrode of the storage battery G0.
Wherein the charging power supply 100, the power-off module 400 and the storage battery G0 form a charging circuit.
The detection module 200 is configured to collect a loop voltage of the charging loop, and detect whether the loop voltage is greater than a preset voltage threshold.
It should be noted that the preset voltage threshold may be slightly lower than the saturation voltage when the battery G0 is fully charged, and the deviation between the preset voltage threshold and the saturation voltage may be preset based on the charging capacity or the requirement of the battery G0. When the loop voltage is greater than the preset voltage threshold, it can be determined that the loop voltage is close to the saturated voltage when the battery G0 is fully charged, and when the loop voltage is continuously greater than the preset voltage threshold, it can be determined that the battery G0 is fully charged.
In a specific implementation, the detection module 200 may collect the voltage in the charging loop in real time, and compare the collected loop voltage with a preset voltage threshold to determine whether the loop voltage reaches the preset voltage threshold when the storage battery is fully charged.
For ease of understanding, the description is given with reference to fig. 2, but the present solution is not limited thereto. Fig. 2 is a schematic circuit diagram of a first embodiment of the battery charging circuit according to the present invention, and in fig. 2, the detection module 200 includes: the first operational amplifier A1 and the first resistor R1.
The non-inverting input end of the first operational amplifier A1 is connected with a first reference source Vref1, the inverting input end of the first operational amplifier A1 is respectively connected with the negative electrode of the charging power supply 100 and the first end of the first resistor R1, and the second end of the first resistor R1 is connected with the negative electrode of the storage battery G0.
The charging circuit may be configured by the charging power source 100, the power-off module 400, the battery G0, and the first resistor R1. The voltage on the first resistor R1 may be used as a loop voltage, and the inverting input terminal of the first operational amplifier A1 may collect the loop voltage on the first resistor R1. Correspondingly, the first reference source Vref1 may provide the predetermined voltage threshold for the non-inverting input terminal of the first operational amplifier A1. After the first operational amplifier A1 receives the loop voltage and the preset voltage threshold, the loop voltage can be compared with the preset voltage threshold.
The detection module 200 is further configured to output an energy storage signal to the energy storage module 300 when the loop voltage is greater than the preset voltage threshold.
It should be noted that the energy storage signal may be a signal that triggers the energy storage device in the energy storage module 300 to store energy.
In a specific implementation, when the first operational amplifier detects that the loop voltage is greater than the preset voltage threshold, the first operational amplifier may output a low-level energy storage signal to the energy storage module 300, so that the energy storage device in the energy storage module 300 stores energy.
The energy storage module 300 is configured to store energy to the energy storage device according to the energy storage signal, and output a power-off signal to the power-off module 400 when the energy storage voltage of the energy storage device reaches a preset energy storage voltage.
It should be noted that the preset energy storage voltage may be a voltage when the energy storage device is full of energy.
In a specific implementation, the energy storage module 300 may start to store energy for the energy storage device when the energy storage signal is received, when the energy storage signal is continuously received, the energy storage device may be continuously stored, and when the energy storage voltage of the energy storage device reaches the preset energy storage voltage, that is, when the energy storage signal is continuously received until the energy storage device is full of energy, the power-off signal may be output to the power-off module 400.
It should be understood that when the battery G0 is fully charged, the voltage thereof fluctuates around the saturation voltage, i.e., the preset voltage threshold. When the detection module 200 continuously detects that the loop voltage is greater than the voltage threshold, the energy storage module 300 can continuously output the energy storage signal, and when the energy storage module 300 is fully charged with the energy storage device based on the energy storage signal, it can be determined that the loop voltage is continuously greater than the preset voltage threshold in the charging time of the energy storage device, and it can be determined that the storage battery G0 is fully charged. The value of the saturated voltage of the storage battery G0 is larger than that of the loop current, so that the saturated voltage can be accurately detected, the charging time can be set based on the energy storage parameters of the energy storage device, whether the storage battery G0 is fully charged or not can be accurately detected through the loop voltage, and the detection precision is effectively improved.
Further, in this embodiment, the detection module 200 is further configured to output a discharge signal to the energy storage module 300 when the loop voltage is less than the preset voltage threshold.
It should be noted that the above-mentioned discharging signal may be a signal for triggering the energy storage device in the energy storage module 300 to discharge.
In a specific implementation, the first operational amplifier A1 in the detection module 200 can output a high-level discharge signal to the energy storage module 300 when detecting that the loop voltage is smaller than the preset voltage threshold.
The energy storage module 300 is further configured to discharge the energy storage device when receiving the discharge signal.
In a specific implementation, when the energy storage module 300 receives the discharging signal, if the energy storage device is already being charged, the energy storage device may be discharged, and if the energy storage device is not being charged, no processing is performed.
As shown in fig. 2, in this embodiment, the energy storage module 300 includes: the energy storage device comprises a first MOS tube Q1, a second MOS tube Q2, a third MOS tube Q3, a second resistor R2 and a third resistor R3, wherein the energy storage device is an energy storage capacitor C0.
The grid electrode of the first MOS tube Q1 is connected with the output end of the first operational amplifier A1, the source electrode of the first MOS tube Q1 is connected with the first end of the second resistor R2, the second end of the second resistor R2 is connected with the first power supply Vcc1, and the drain electrode of the first MOS tube Q1 is connected with the first end of the energy storage capacitor C0; the grid electrode of the second MOS tube Q2 is connected with the output end of the first operational amplifier A1, the source electrode of the second MOS tube Q2 is connected with the first end of the third resistor R3, the second end of the third resistor R3 is connected with the second end of the energy storage capacitor C0, and the drain electrode of the second MOS tube Q2 is connected with the first end of the energy storage capacitor C0; the gate of the third MOS transistor Q3 is connected to the power-off module 400, the source of the third MOS transistor Q3 is connected to the first end of the third resistor R3, and the drain of the third MOS transistor Q3 is connected to the power-off module 400.
It should be noted that, the first MOS transistor is a PMO transistor, and the second MOS transistor Q2 and the second MOS transistor Q3 are both NMOS transistors.
Further, in this embodiment, when the energy storage signal is received, the first MOS transistor Q1 is configured to turn on a capacitor charging loop between the first power supply Vcc1 and the energy storage capacitor C0, so that the first power supply Vcc1 charges the energy storage capacitor C0.
In a specific implementation, when the first operational amplifier A1 detects that the loop voltage is greater than the preset voltage threshold, it can output a low-level energy storage signal to the energy storage module 300, the first MOS transistor Q1 in the energy storage module 300 is turned on, and the second MOS transistor Q2 is turned off, so that the first power supply Vcc1 is connected to the energy storage capacitor C0, and a capacitor charging loop between the first power supply Vcc1, the second resistor R2 and the energy storage capacitor C0 is turned on, so that the first power supply Vcc charges the energy storage capacitor C0.
The second MOS transistor Q2 is configured to, when receiving the discharge signal, turn on a capacitor discharge loop between the energy storage capacitor C0 and the third resistor R3, so that the energy storage capacitor C0 discharges through the third resistor R3.
In a specific implementation, when the first operational amplifier A1 detects that the loop voltage is less than the preset voltage threshold, it can output a high-level discharge signal to the energy storage module 300, the first MOS transistor Q1 in the energy storage module 300 is turned off, the second MOS transistor Q2 is turned on, so that the third resistor R3 is connected to the energy storage capacitor C0, and a capacitor discharge loop between the energy storage capacitor C0 and the third resistor R3 is turned on, so that the energy storage capacitor C0 discharges through the third resistor R3.
It should be understood that the capacitance value of the energy storage capacitor C0 and the resistance value of the third resistor R3 may be set so that the discharging speed of the energy storage capacitor C0 is greater than the charging speed, and the discharging can be completed in a short time.
When the loop voltage is greater than the preset voltage threshold, the energy storage capacitor C0 starts to charge, and when the loop voltage starts to fluctuate and is lower than the preset voltage threshold, if the energy storage capacitor C0 is not fully charged at this time, the energy storage capacitor C0 is discharged in a short time through the capacitor discharging loop, so that the electric energy of the energy storage capacitor C0 is reset. And when the storage capacitor C0 starts to charge and the loop voltage is not fluctuated and is continuously larger than the preset voltage threshold until the storage capacitor is fully charged, a power-off signal can be output, so that the condition that the storage battery is not fully charged and still outputs the power-off signal when the loop voltage is fluctuated is avoided, and the power-off precision is effectively improved.
The power-off module 400 is configured to disconnect the charging loop based on the power-off signal.
It should be noted that, the power-off module 400 may be provided with a switching device inside, and the switching device is connected between the charging power source 100 and the storage battery G0, and is closed when the storage battery G0 is connected to the charging power source 100, so that the charging power source 100 charges the storage battery G0. The power-off signal can be a trigger signal for controlling the switching device to be turned off.
In a specific implementation, when the power-off module 400 receives the power-off signal, the switching device may be controlled to disconnect the charging circuit between the charging power source 100 and the battery G0, so as to stop the charging power source 100 from charging the battery G0.
In the embodiment, a detection module is used for collecting the loop voltage of the charging loop and detecting whether the loop voltage is larger than a preset voltage threshold value; the detection module outputs an energy storage signal to the energy storage module when the loop voltage is greater than a preset voltage threshold; the energy storage module stores energy of the energy storage device according to the energy storage signal, and outputs a power-off signal to the power-off module when the energy storage voltage of the energy storage device reaches a preset energy storage voltage; the power-off module disconnects the charging loop based on a power-off signal. According to the embodiment, the energy storage device is controlled to store energy by detecting the loop voltage of the charging loop, the charging loop is disconnected when the energy storage voltage of the energy storage device reaches the preset energy storage voltage, and compared with the state that the charging loop is disconnected by loop current in the prior art, the circuit is powered off by detecting the loop voltage, and the loop voltage of the storage battery when the storage battery is full is larger than the loop current in value, so that the charging loop can be accurately disconnected, and the storage battery overheat damage caused by the fact that the storage battery charger continuously consumes electric energy to float the storage battery is effectively avoided.
Referring to fig. 3, fig. 3 is a schematic diagram of a second embodiment of a battery charging circuit according to the present invention.
Based on the first embodiment, in this embodiment, the power-off module 400 includes: a power-off start unit 401, a power-off detection unit 402, and a power-off unit 403.
The power-off detection unit 402 is respectively connected with the power-off starting unit 401, the power-off unit 403 and the first end of the energy storage capacitor C0, and the power-off starting unit 401 is respectively connected with the first end of the energy storage capacitor C0 and the gate of the third MOS transistor Q3.
The power-off starting unit 401 is configured to, when receiving the power-off signal, turn on the capacitor discharging circuit through the third MOS transistor Q3, so that the energy storage capacitor C0 discharges through the capacitor discharging circuit.
In a specific implementation, the power-off signal may be triggered by a capacitor voltage, i.e., a preset energy storage voltage, when the energy storage capacitor C0 is fully charged, and the power-off starting unit 401 may output a high-level signal to the third MOS transistor Q3 when detecting the power-off signal, so as to close the third MOS transistor Q3, and conduct the capacitor discharging loop, so that the energy storage capacitor C0 discharges through the capacitor discharging loop.
For ease of understanding, the description is given with reference to fig. 4, but the present solution is not limited thereto. Fig. 4 is a schematic circuit diagram of a second embodiment of the battery charging circuit according to the present invention, and in fig. 4, the power-off starting unit 401 includes: fourth MOS pipe Q4, fourth resistance R4 and fifth resistance R5.
The grid electrode of the fourth MOS tube Q4 is connected with the first end of the fourth resistor R4, and the first end of the fourth resistor R4 is connected with the first end of the energy storage capacitor C0; the source electrode of the fourth MOS transistor Q4 is connected with the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is connected with the second power supply Vcc 2; the drain electrode of the fourth MOS transistor Q4 is connected to the power-off detection unit 402 and the gate electrode of the third MOS transistor Q3, respectively.
It should be noted that, the fourth MOS transistor Q4 is an NMOS transistor, the preset energy storage voltage may be configured to be greater than a supply voltage of the second power supply Vcc2, when the energy storage capacitor of the energy storage capacitor C0 reaches the preset energy storage voltage, a power-off signal with a voltage value equal to the preset energy storage voltage may be output to the fourth MOS transistor Q4, so as to close the fourth MOS transistor Q4, and the second power supply Vcc2 may output a high-level signal to the third MOS transistor Q3, so as to close the third MOS transistor Q3, and turn on the capacitor discharge loop.
The power-off starting unit 401 is further configured to turn on a reference input circuit between the power-off detecting unit 402 and the second reference source Vref2 based on the power-off signal, so that the second reference source Vref2 outputs a preset power-off voltage to the power-off detecting unit 402 through the reference input circuit.
It should be noted that the preset power-off voltage is a reference voltage for detecting whether to disconnect the charging circuit.
As shown in fig. 4, in the present embodiment, the power outage detection unit 402 includes: the second operational amplifier A2, the fifth MOS transistor Q5 and the sixth resistor R6.
The grid electrode of the fifth MOS tube Q5 is connected with the drain electrode of the fourth MOS tube Q4; the source electrode of the fifth MOS tube Q5 is connected with the second reference source Vref 2; the drain electrode of the fifth MOS transistor Q5 is connected to the non-inverting input end of the second operational amplifier A2, the inverting input end of the second operational amplifier A2 is connected to the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected to the drain electrode of the third MOS transistor Q3, and the output end of the second operational amplifier A2 is connected to the power-off unit 403.
In a specific implementation, the fifth MOS transistor Q5 is an NMOS transistor, and the power supply voltage output by the second power supply Vcc2 is greater than the preset power-off voltage output by the second reference source Vref 2. When the fourth MOS transistor Q4 receives the power-off signal and is turned on, the second power supply Vcc2 may output a high-level signal to the fifth MOS transistor Q5, control the fifth MOS transistor Q5 to be turned on, and conduct a reference input loop between the second reference source Vref2 and the second operational amplifier A2, so that the second reference source Vref2 outputs a preset power-off voltage to the non-inverting input terminal of the second preset amplifier A2.
The power-off detection unit 402 is configured to collect a discharge voltage of the energy storage capacitor C0, and compare the discharge voltage with the preset power-off voltage.
In a specific implementation, when the energy storage capacitor C0 is discharged after the third MOS transistor Q3 is closed, the inverting input terminal of the second operational amplifier A2 may collect the discharge voltage of the two ends of the energy storage capacitor C0 when discharging in real time, and then compare the discharge voltage with the preset power-off voltage on the non-inverting input terminal.
The power-off detection unit 402 is further configured to output a power-off control signal to the power-off unit 403 when the discharge voltage is less than the preset power-off voltage.
It should be noted that, the power-off control signal may be a trigger signal for controlling the power-off unit 403 to disconnect the charging circuit.
In a specific implementation, in the discharging process, the discharging voltage of the energy storage capacitor C0 is continuously reduced until the discharging is completed. When the second operational amplifier A2 detects that the discharge voltage is lower than the preset power-off voltage, it can output a high-level power-off control signal to the power-off unit 403, so that the power-off unit 403 turns off the charging circuit based on the power-off control signal.
It should be understood that, since the energy storage capacitor C0 discharges when the loop voltage of the charging loop is lower than the preset value and lower than the threshold value, in order to avoid the second preset amplifier A2 outputting the power-off signal in this case, a fifth MOS transistor Q5 may be disposed between the second reference source Vref2 and the inverting input terminal of the second operational amplifier A2, where the fifth MOS transistor Q5 is turned on after the energy storage capacitor is fully charged, so as to avoid outputting the power-off control signal to disconnect the charging loop when the storage battery G0 is not fully charged, thereby improving the power-off precision.
In addition, the power-off signal is triggered when the discharge voltage of the energy storage capacitor C0 is lower than a preset threshold value, and is triggered when the energy storage capacitor C0 is fully charged, and a discharge time when the discharge voltage is reduced to a preset charge voltage exists in the middle, that is, the power-off control signal can be triggered after the discharge time is reached, so that time-delay power-off is realized, a certain cooling time can be given to the storage battery G0, heat in the storage battery G0 can be emitted, overheat of the storage battery G0 is avoided, and the safety of the storage battery G0 is protected.
The power-off unit 403 is configured to disconnect the charging loop based on the power-off control signal.
In a specific implementation, as shown in fig. 4, in this embodiment, the power-off unit 403 includes: first triode Q6, relay K1 and relay normally closed switch KT1.
The base electrode of the first triode Q6 is connected with the output end of the second operational amplifier A2; an emitter of the first triode Q6 is connected with a negative electrode of the storage battery G0; the collector of the first triode Q6 is connected with the first end of the relay K1, the second end of the relay K1 is respectively connected with the positive electrode of the charging power supply 100 and the first end of the relay normally-closed switch KT1, and the second end of the relay normally-closed switch KT1 is connected with the positive electrode of the storage battery G0.
In a specific implementation, the relay normally-closed switch KT1 is located between the charging power source 100 and the storage battery G0, and is kept in a closed state when the relay K1 is not energized, so that the charging circuit is turned on. When the second operational amplifier A2 detects that the discharge voltage is lower than the preset power-off voltage, a high-level power-off control signal can be output to the first triode Q6 to turn on the first triode Q6, the first relay K1 is electrified, the normally-closed relay KT1 is turned off, the charging loop is turned off, and the charging power supply 100 stops charging the storage battery G0.
In the embodiment, when the power-off starting unit receives a power-off signal, the capacitor discharging loop is conducted through the third MOS tube, so that the energy storage capacitor is discharged through the capacitor discharging loop; the power-off starting unit is used for conducting a reference input loop between the power-off detection unit and the second reference source based on a power-off signal so that the second reference source outputs a preset power-off voltage to the power-off detection unit through the reference input loop; the power-off detection unit collects the discharge voltage of the energy storage capacitor and compares the discharge voltage with a preset power-off voltage; the power-off detection unit outputs a power-off control signal to the power-off unit when the discharge voltage is smaller than the preset power-off voltage; the power-off unit turns off the charging loop based on a power-off control signal. According to the embodiment, the charging loop is controlled to be disconnected by outputting the power-off control signal when the discharging voltage is lower than the preset power-off voltage, so that the delayed power-off is realized, the overheat of the storage battery is avoided, and the safety of the storage battery is effectively protected.
In addition, the embodiment of the invention also provides a storage battery charging device, which comprises the storage battery charging circuit.
The embodiment or the specific implementation manner of the battery charging device of the present invention may refer to the above embodiment of the battery charging circuit, and will not be described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (10)

1. A battery charging circuit, said circuit comprising: the device comprises a charging power supply, a detection module, an energy storage module and a power-off module, wherein an energy storage device is arranged in the energy storage module;
the detection module is respectively connected with the negative electrode of the charging power supply, the energy storage module and the negative electrode of the storage battery, the energy storage module is connected with the power-off module, and the power-off module is respectively connected with the positive electrode of the charging power supply and the positive electrode of the storage battery;
wherein the charging power supply, the power-off module and the storage battery form a charging loop;
the detection module is used for collecting the loop voltage of the charging loop and detecting whether the loop voltage is larger than a preset voltage threshold value or not;
the detection module is further configured to output an energy storage signal to the energy storage module when the loop voltage is greater than the preset voltage threshold;
the energy storage module is used for storing energy of the energy storage device according to the energy storage signal, and outputting a power-off signal to the power-off module when the energy storage voltage of the energy storage device reaches a preset energy storage voltage;
the power-off module is used for breaking the charging loop based on the power-off signal.
2. The battery charging circuit of claim 1, wherein the detection module is further configured to output a discharge signal to the energy storage module when the loop voltage is less than the preset voltage threshold;
the energy storage module is further used for discharging the energy storage device after receiving the discharging signal.
3. The battery charging circuit of claim 2, wherein said detection module comprises: a first operational amplifier and a first resistor;
the non-inverting input end of the first operational amplifier is connected with a first reference source, the inverting input end of the first operational amplifier is respectively connected with the negative electrode of the charging power supply and the first end of the first resistor, and the second end of the first resistor is connected with the negative electrode of the storage battery.
4. The battery charging circuit of claim 3, wherein said energy storage module comprises: the energy storage device comprises a first MOS tube, a second MOS tube, a third MOS tube, a second resistor and a third resistor, wherein the energy storage device is an energy storage capacitor;
the grid electrode of the first MOS tube is connected with the output end of the first operational amplifier, the source electrode of the first MOS tube is connected with the first end of the second resistor, the second end of the second resistor is connected with a first power supply, and the drain electrode of the first MOS tube is connected with the first end of the energy storage capacitor;
the grid electrode of the second MOS tube is connected with the output end of the first operational amplifier, the source electrode of the second MOS tube is connected with the first end of the third resistor, the second end of the third resistor is connected with the second end of the energy storage capacitor, and the drain electrode of the second MOS tube is connected with the drain electrode of the first end of the energy storage capacitor;
the grid electrode of the third MOS tube is connected with the power-off module, the source electrode of the third MOS tube is connected with the first end of the third resistor, and the drain electrode of the third MOS tube is connected with the power-off module.
5. The battery charging circuit of claim 4, wherein the first MOS transistor is configured to, upon receiving the energy storage signal, turn on a capacitor charging loop between the first power supply and the energy storage capacitor, so that the first power supply charges the energy storage capacitor;
and the second MOS tube is used for conducting a capacitor discharging loop between the energy storage capacitor and the third resistor when the discharging signal is received, so that the energy storage capacitor discharges through the third resistor.
6. The battery charging circuit of claim 5, wherein said power down module comprises: the device comprises a power-off starting unit, a power-off detection unit and a power-off unit;
the power-off detection unit is respectively connected with the power-off starting unit, the power-off unit and the first end of the energy storage capacitor, and the power-off starting unit is respectively connected with the first end of the energy storage capacitor and the grid electrode of the third MOS tube;
the power-off starting unit is used for conducting the capacitor discharging loop through the third MOS tube when the power-off signal is received, so that the energy storage capacitor is discharged through the capacitor discharging loop;
the power-off starting unit is further used for conducting a reference input loop between the power-off detection unit and a second reference source based on the power-off signal, so that the second reference source outputs a preset power-off voltage to the power-off detection unit through the reference input loop;
the power-off detection unit is used for collecting the discharge voltage of the energy storage capacitor and comparing the discharge voltage with the preset power-off voltage;
the power-off detection unit is further configured to output a power-off control signal to the power-off unit when the discharge voltage is less than the preset power-off voltage;
the power-off unit is used for breaking the charging loop based on the power-off control signal.
7. The battery charging circuit of claim 6, wherein said power-off starting unit comprises: the fourth MOS tube, the fourth resistor and the fifth resistor;
the grid electrode of the fourth MOS tube is connected with the first end of the fourth resistor, and the first end of the fourth resistor is connected with the first end of the energy storage capacitor;
the source electrode of the fourth MOS tube is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with a second power supply;
and the drain electrode of the fourth MOS tube is respectively connected with the power-off detection unit and the grid electrode of the third MOS tube.
8. The battery charging circuit of claim 7, wherein said power outage detection unit comprises: the second operational amplifier, the fifth MOS tube and the sixth resistor;
the grid electrode of the fifth MOS tube is connected with the drain electrode of the fourth MOS tube;
the source electrode of the fifth MOS tube is connected with the second reference source;
the drain electrode of the fifth MOS tube is connected with the non-inverting input end of the second operational amplifier, the inverting input end of the second operational amplifier is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the drain electrode of the third MOS tube, and the output end of the second operational amplifier is connected with the power-off unit.
9. The battery charging circuit of claim 8, wherein said power-off unit comprises: the first triode, the relay and the relay normally-closed switch;
the base electrode of the first triode is connected with the output end of the second operational amplifier;
the emitter of the first triode is connected with the negative electrode of the storage battery;
the collector of the first triode is connected with the first end of the relay, the second end of the relay is respectively connected with the positive electrode of the charging power supply and the first end of the normally-closed switch of the relay, and the second end of the normally-closed switch of the relay is connected with the positive electrode of the storage battery.
10. A battery charging apparatus, characterized in that the apparatus comprises a battery charging circuit as claimed in any one of claims 1 to 9.
CN202311685719.9A 2023-12-11 2023-12-11 Storage battery charging circuit and device Active CN117394504B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101414760A (en) * 2007-10-19 2009-04-22 鸿富锦精密工业（深圳）有限公司 Charging circuit and error compensation method
US20090200986A1 (en) * 2008-02-08 2009-08-13 Sion Power Corporation Protective circuit for energy-storage device
CN114069769A (en) * 2021-10-22 2022-02-18 南方电网数字电网研究院有限公司 Storage battery remote nuclear capacity charging and discharging safety protection circuit and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101414760A (en) * 2007-10-19 2009-04-22 鸿富锦精密工业（深圳）有限公司 Charging circuit and error compensation method
US20090200986A1 (en) * 2008-02-08 2009-08-13 Sion Power Corporation Protective circuit for energy-storage device
CN114069769A (en) * 2021-10-22 2022-02-18 南方电网数字电网研究院有限公司 Storage battery remote nuclear capacity charging and discharging safety protection circuit and method

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