CN218958577U - Battery charging circuit - Google Patents
Battery charging circuit Download PDFInfo
- Publication number
- CN218958577U CN218958577U CN202222759301.5U CN202222759301U CN218958577U CN 218958577 U CN218958577 U CN 218958577U CN 202222759301 U CN202222759301 U CN 202222759301U CN 218958577 U CN218958577 U CN 218958577U
- Authority
- CN
- China
- Prior art keywords
- battery
- voltage
- circuit
- charging
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
A battery charging circuit comprising: a voltage adjustment circuit: the high-voltage power supply comprises a field effect tube Q1, an inductor L1 and a diode D2, wherein a first section of the field effect tube Q1 is connected with an input end, a second port is connected with an output end and is connected with the diode D2 in series, and the second port is also connected with the inductor L1; overvoltage protection circuit: comprises a relay RLY2, a diode D3, a rechargeable battery BAT and a driving circuit; a charging voltage detection circuit: the charging voltage detection circuit is respectively connected with two output ends of the voltage adjustment circuit; power pole circuit: the energy storage capacitor comprises a first switching tube M1, a second switching tube M2, a first battery V1, a second battery V2, a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5, a sixth switching tube Q6 and an energy storage capacitor L1; the rechargeable battery is protected from being damaged by the excessively high charging voltage, and the circuit can utilize active equalization to adjust the voltage after charging, so that the battery with high voltage charges the battery with low voltage, and the problem of battery overshoot can be avoided.
Description
Technical Field
The present disclosure relates to battery charging, and particularly to a battery charging circuit.
Background
The disposable battery has no value for users after the electric quantity is used up, most people discard the disposable battery after the disposable battery is used up, the harm of the waste battery to the environment is very large, and the rechargeable battery appears later.
In the existing charging circuit for charging the rechargeable battery, a protection circuit for protecting the battery when the charging circuit fails is not provided, so that the rechargeable battery is very easily damaged when the charging circuit fails, particularly when the charging voltage is too high. The utility model discloses a charging circuit and a battery with the publication number of CN211908400U, wherein the charging circuit comprises a switch module, a current limiting module and a unidirectional conduction module; the switch module is used for keeping open when the output voltage of the positive electrode of the battery to be charged is smaller than a preset voltage, and keeping closed when the output voltage of the positive electrode of the battery to be charged is not smaller than the preset voltage; the output end of the unidirectional conduction module is connected with the anode of the battery to be charged. The utility model can realize small-current charging at the initial stage of battery charging and large-current charging at the later stage, can reduce the influence of charging on the battery, protects the battery and prolongs the service life of the battery.
However, there is a protection circuit that does not protect the battery when the circuit fails, so that the rechargeable battery is very easily damaged when the charging circuit fails, particularly when the charging voltage is too high, and thus a battery charging circuit is proposed.
Disclosure of Invention
In order to solve the problem that the protection circuit for protecting the battery is not provided when the circuit fails, and thus the rechargeable battery is very easy to damage when the charging circuit fails, particularly when the charging voltage is too high.
The utility model is realized by the following technical scheme:
the utility model proposes a battery charging circuit, comprising:
a voltage adjustment circuit: the high-voltage power supply comprises a field effect tube Q1, an inductor L1 and a diode D2, wherein a first section of the field effect tube Q1 is connected with an input end, a second port is connected with an output end and is connected with the diode D2 in series, and the second port is also connected with the inductor L1;
overvoltage protection circuit: the device comprises a relay RLY2, a diode D3, a charged battery BAT and a driving circuit, wherein the driving circuit is used for driving the relay RLY2, one normally closed contact of the relay RLY2 is connected between the voltage regulating circuit and the charged battery BAT, the diode D3 is connected with the relay RLY2 in parallel, and the voltage regulating circuit charges the charged battery through the overvoltage protection circuit;
a charging voltage detection circuit: the charging voltage detection circuit is respectively connected with two output ends of the voltage adjustment circuit;
power pole circuit: the high-voltage power supply circuit comprises a first switch tube M1, a second switch tube M2, a first battery V1, a second battery V2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6 and an energy storage capacitor L1, wherein the drain electrode of the first switch tube M1 is connected with the high-potential end of an input voltage, the source electrode of the first switch tube M1 is connected with the drain electrode of the second switch tube M2, the source electrode of the second switch tube M2 is connected with the low-potential end of an output voltage, one end of an energy storage inductor L1 is connected with the public end of the first switch tube M1 and the public end of the second switch tube M2, the other end of the energy storage inductor L1 is connected with the positive electrode of the first battery V1, the control end of the fourth switch tube Q4 is connected with the negative electrode of the second battery V2, and the control end of the sixth switch tube Q6 is connected with the negative electrode of the second battery V2;
and a voltage stabilizing capacitor: the battery is connected with the charged battery in parallel and used for stabilizing the charging voltage;
and the charging voltage detection circuit detects that the charging voltage output by the charging battery of the voltage adjustment circuit is higher than the limit value, and triggers the controllable switch of the overvoltage protection circuit to be disconnected.
Further, the voltage regulating circuit is a BUCK circuit and comprises an equivalent circuit when the switch is on and an equivalent circuit when the switch is off.
Further, the overvoltage protection circuit is provided with a relay and a driving circuit, and the driving circuit is used for driving the relay.
Further, the relay is provided with a normally closed contact, and the normally closed controllable switch is a normally closed contact.
Further, the driving circuit comprises a field effect tube Q2 and a diode D3, the grid electrode of the field effect tube Q2 is connected with the charging voltage detection circuit, the source electrode is grounded, the drain electrode is externally connected with a power supply, one end of a coil of the relay is externally connected with the power supply, the other end of the coil of the relay is connected with the drain electrode of the field effect tube Q2, the diode D3 is connected with the coil of the relay in parallel, and the anode of the diode D3 is connected with a junction point of the coil of the relay and the drain electrode of the field effect tube Q2.
Further, the first switching tube and the second switching tube are N-type MOS tubes, which further detect voltages of common terminals of the first battery and the second battery, and when the voltage of the common terminal is smaller than that of the second terminal of the second switching tube, judge that the second battery is reversely connected, and turn off the fifth switching tube; and when the voltage of the common terminal is larger than the voltage of the first terminal of the first switching tube, judging that the first battery is reversely connected, and switching off the third switching tube.
Further, when the first switch tube and the second switch tube are in a charging state, the first battery and the second battery are alternately charged, the charging time of the first battery and the charging time of the second battery are equal, the voltage of the first battery and the voltage of the second battery are detected, when the pressure difference of the first battery and the voltage difference of the second battery exceeds a limit value, the charging time of the battery with small voltage is prolonged, and the charging time of the battery with large voltage is shortened until the pressure difference of the first battery and the voltage difference of the second battery is lower than the limit value.
The utility model has the beneficial effects that:
according to the battery charging circuit, the overvoltage protection circuit is arranged between the voltage adjusting circuit and the charged battery, when the overvoltage protection circuit is found that once the charging voltage is too high, the circuit for charging between the voltage adjusting circuit and the charged battery is cut off, so that the charged battery is protected from being damaged by the too high charging voltage, and the circuit can utilize active equalization to adjust the charged voltage, so that the battery with high voltage charges the battery with low voltage, the problem of battery overshoot can be avoided, the battery charging efficiency is improved, and the charging loss cost is reduced.
Drawings
Fig. 1 is a schematic circuit diagram of a battery charging circuit according to the present utility model.
Detailed Description
In order to more clearly and completely describe the technical scheme of the utility model, the utility model is further described below with reference to the accompanying drawings.
Referring to fig. 1, the present utility model provides a battery charging circuit.
As shown in fig. 1, a battery charging circuit includes: a voltage regulating circuit 1, a voltage stabilizing capacitor C1, an overvoltage protection circuit 2, a charging voltage detecting circuit 3 and a power pole circuit 4. The voltage regulating circuit 1 comprises a field effect tube Q1, an inductor L1 and a diode D2, wherein the three components form a BUCK circuit, the input end of the BUCK circuit is respectively connected with the positive electrode U+ and the negative electrode U-of a charging power supply, a voltage stabilizing capacitor C1 is connected with a charged battery BAT in parallel, and the voltage stabilizing capacitor C1 is used for stabilizing charging voltage; the overvoltage protection circuit 2 comprises a relay RLY2 and a driving circuit 21, the driving circuit 21 is used for driving the relay RLY2, one normally closed contact of the relay RLY2 is connected between the voltage regulating circuit 1 and the charged battery BAT, and the charging voltage detecting circuit 3 is respectively connected with two output ends of the voltage regulating circuit 1 so as to detect the charging voltage of the charged battery BAT; the power pole circuit 4 comprises a first switch tube M1, a second switch tube M2, a first battery V1, a second battery V2 and an energy storage capacitor L1, wherein the drain electrode of the first switch tube M1 is connected with the high potential end of input voltage, the source electrode of the first switch tube M1 is connected with the drain electrode of the second switch tube M2, the source electrode of the second switch tube M2 is connected with the low potential end of output voltage, one end of an energy storage inductor L1 is connected with the public end of the first switch tube M1 and the public end of the second switch tube M2, the other end of the energy storage inductor L1 is connected with the public end of the first battery V1 and the public end of the second battery V2, the control end of the fourth switch tube Q4 is connected to the positive electrode of the first battery V1, and the control end of the sixth switch tube Q6 is connected with the negative electrode of the second battery V2.
In this embodiment, the voltage adjusting circuit 1 reduces the voltage between u+ and U-of the charging power supply to a preset charging voltage, after the voltage is stabilized by the stabilizing capacitor C1, the normally closed contact of the relay rliy 2 supplies power to the battery BAT to be charged, and when the charging voltage detecting circuit 3 detects that the charging voltage is higher than the limit value, a high level is output to the gate of the field effect transistor Q2 of the driving circuit 21 to trigger the conduction of the field effect transistor Q2, at this time, the coil of the relay rliy 2 and the field effect transistor Q2 form a loop, the coil of the relay rliy 2 has a current flowing, the normally closed contact thereof is disconnected, the loop of the voltage adjusting circuit 1 supplying power to the battery BAT to be charged is cut off, and the charging of the battery BAT to be charged is forced to be terminated, thereby preventing the battery BAT to be charged by the high charging voltage for a long time, and protecting the battery BAT from being damaged.
In an embodiment, the first battery V1 and the second battery V2 are alternately charged, and the charging time of the first battery V1 and the charging time of the second battery V2 are equal, the voltage of the first battery V1 and the voltage of the second battery V2 are detected, when the voltage difference between the two voltages exceeds the limit value, the charging time of the battery with small voltage is prolonged, the charging time of the battery with large voltage is shortened, and the state of charging is returned after the voltage difference between the two voltages is lower than the limit value; when the voltage of the first battery V1 is greater than that of the second battery V2, it is U V1 >U V2 When the voltage of the first battery V1 is smaller than that of the second battery V2, the first switch tube M1 and the second switch tube M2 are in high-frequency switch states, the first switch tube M1 is the main tube, the second switch tube M2 is the auxiliary tube, and when the voltage of the first battery V1 is smaller than that of the second battery V2, the first switch tube M1 is U V1 <U V2 In the process, the first switching tube M1 and the second switching tube M2 work in a high-frequency switching state, the first switching tube M1 is an auxiliary tube, and the second switching tube M2 is a main tube.
In one embodiment, the voltage regulating circuit 1 is a BUCK circuit, and comprises an equivalent circuit when the switch is turned on and an equivalent circuit when the switch is turned off, and the sum of the voltage of the first battery V1 and the voltage of the second battery V2 is U V1 +U V2 Output is the voltage U of the second battery V2 V2 The first battery V1 charges the second battery V2, so that the voltage of the first battery V1 decreases and the voltage of the second battery V2 increases until the voltages are equal, if the circuit is similar to a BOOST circuit, namely a BOOST circuit,the voltage input into the second battery V2 is the sum of the voltage of the first battery V1 and the voltage of the second battery V2, namely U V1 +U V2 The second battery V2 charges the first battery V1 such that the voltage of the second battery V2 decreases and the voltage of the first battery V1 increases until the voltages are equal.
In an embodiment, the power pole circuit 4 includes a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5, and a sixth switching tube Q6, where a control end of the fourth switching tube Q4 is connected to an anode of the first battery V1, a control end of the sixth switching tube Q6 is connected to a cathode of the second battery V2, and a voltage at a common end of the first battery V1 and the second battery V2 is detected, that is, a point C voltage, where the point C voltage is less than a voltage of a source of the second switching tube M2, the battery is determined to be reversely connected, the fifth switching tube Q5 is turned off, the battery is prevented from being reversely connected, and where the point C voltage is greater than a voltage of a drain of the first switching tube M1, the third switching tube Q3 is turned off, and the battery is prevented from being reversely connected.
Of course, the present utility model can be implemented in various other embodiments, and based on this embodiment, those skilled in the art can obtain other embodiments without any inventive effort, which fall within the scope of the present utility model.
Claims (7)
1. A battery charging circuit, comprising:
a voltage adjustment circuit: the high-voltage power supply comprises a field effect tube Q1, an inductor L1 and a diode D2, wherein a first section of the field effect tube Q1 is connected with an input end, a second port is connected with an output end and is connected with the diode D2 in series, and the second port is also connected with the inductor L1;
overvoltage protection circuit: the device comprises a relay RLY2, a diode D3, a charged battery BAT and a driving circuit, wherein the driving circuit is used for driving the relay RLY2, one normally closed contact of the relay RLY2 is connected between the voltage regulating circuit and the charged battery BAT, the diode D3 is connected with the relay RLY2 in parallel, and the voltage regulating circuit charges the charged battery through the overvoltage protection circuit;
a charging voltage detection circuit: the charging voltage detection circuit is respectively connected with two output ends of the voltage adjustment circuit;
power pole circuit: the high-voltage power supply circuit comprises a first switch tube M1, a second switch tube M2, a first battery V1, a second battery V2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6 and an energy storage capacitor L1, wherein the drain electrode of the first switch tube M1 is connected with the high-potential end of an input voltage, the source electrode of the first switch tube M1 is connected with the drain electrode of the second switch tube M2, the source electrode of the second switch tube M2 is connected with the low-potential end of an output voltage, one end of an energy storage inductor L1 is connected with the public end of the first switch tube M1 and the public end of the second switch tube M2, the other end of the energy storage inductor L1 is connected with the positive electrode of the first battery V1, the control end of the fourth switch tube Q4 is connected with the negative electrode of the second battery V2, and the control end of the sixth switch tube Q6 is connected with the negative electrode of the second battery V2;
and a voltage stabilizing capacitor: the battery is connected with the charged battery in parallel and used for stabilizing the charging voltage;
and the charging voltage detection circuit detects that the charging voltage output by the charging battery of the voltage adjustment circuit is higher than the limit value, and triggers the controllable switch of the overvoltage protection circuit to be disconnected.
2. The battery charging circuit of claim 1, wherein the voltage regulating circuit is of the BUCK type, and comprises an equivalent circuit when the switch is on and an equivalent circuit when the switch is off.
3. A battery charging circuit according to claim 1, wherein the overvoltage protection circuit is provided with a relay and a driving circuit for driving the relay.
4. A battery charging circuit according to claim 3, wherein the relay is provided with a normally closed contact, and the normally closed controllable switch is a normally closed contact.
5. A battery charging circuit according to claim 3, wherein the driving circuit comprises a field effect transistor Q2 and a diode D3, the gate of the field effect transistor Q2 is connected to the charging voltage detection circuit, the source is grounded, the drain is externally connected to the power source, one end of the coil of the relay is externally connected to the power source, the other end is connected to the drain of the field effect transistor Q2, the diode D3 is connected in parallel with the coil of the relay, and the anode of the diode D3 is connected to the junction between the coil of the relay and the drain of the field effect transistor Q2.
6. The battery charging circuit of claim 1, wherein the first switching tube and the second switching tube are N-type MOS tubes, which further detect voltages at a common terminal of the first battery and the second battery, and when the voltage at the common terminal is smaller than the voltage at a second terminal of the second switching tube, determine that the second battery is reversely connected, and turn off the fifth switching tube; and when the voltage of the common terminal is larger than the voltage of the first terminal of the first switching tube, judging that the first battery is reversely connected, and switching off the third switching tube.
7. The battery charging circuit of claim 1, wherein when the first switching tube and the second switching tube are in a charging state, the first battery and the second battery are alternately charged, the charging time of the first battery and the charging time of the second battery are equal, the voltage of the first battery and the voltage of the second battery are detected, when the voltage difference of the first battery and the voltage difference of the second battery exceeds a limit value, the charging time of the battery with small voltage is prolonged, and the charging time of the battery with large voltage is shortened until the voltage difference of the first battery and the voltage difference of the second battery is lower than the limit value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222759301.5U CN218958577U (en) | 2022-10-20 | 2022-10-20 | Battery charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222759301.5U CN218958577U (en) | 2022-10-20 | 2022-10-20 | Battery charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218958577U true CN218958577U (en) | 2023-05-02 |
Family
ID=86110780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222759301.5U Active CN218958577U (en) | 2022-10-20 | 2022-10-20 | Battery charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218958577U (en) |
-
2022
- 2022-10-20 CN CN202222759301.5U patent/CN218958577U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201256290Y (en) | Protection circuit for suppressing surge current and preventing input voltage reverse connection | |
| WO2017101647A1 (en) | Power-on/power-off drive circuit and control method therefor | |
| CN110912386B (en) | Active discharge circuit | |
| CN111934401B (en) | Battery protection circuit and lithium battery system | |
| WO2023016574A1 (en) | Switching circuit, battery management system, battery pack, electrical device and control method | |
| CN102904329A (en) | Power supply management circuit | |
| CN113885636B (en) | Input voltage range adjustable protection circuit | |
| CN208257490U (en) | A kind of photovoltaic energy storage device | |
| CN114290905A (en) | Active discharge circuit of motor controller | |
| CN218958577U (en) | Battery charging circuit | |
| CN108767837B (en) | Power connection method, power connector anti-sparking circuit and power with circuit | |
| CN216672596U (en) | Reverse connection preventing circuit, automatic charger robot and charging system | |
| CN103633718A (en) | Hybrid feedback type charging circuit, charger and charging method | |
| CN107425599B (en) | Surge protection circuit for power supply compensator | |
| CN113364259B (en) | Constant-current bleeder circuit with time-delay turn-off protection | |
| CN212304777U (en) | Single-circuit battery discharge circuit | |
| CN109217655B (en) | Power supply capable of prolonging maintenance time after power failure | |
| CN209963809U (en) | Charging protection device and charger | |
| CN219875480U (en) | Time-delay high-voltage protection circuit | |
| CN219086798U (en) | Solenoid valve switch protection circuit | |
| CN213717620U (en) | Anti-surge solid-state direct current relay circuit | |
| CN216056373U (en) | Switch control circuit and charger | |
| CN218888391U (en) | Power supply circuit capable of rapidly outputting voltage, current and power frequency | |
| CN216531081U (en) | Voltage reduction circuit | |
| CN112039166B (en) | Charging circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |