CN112751383A - Charging circuit and electric fan - Google Patents
Charging circuit and electric fan Download PDFInfo
- Publication number
- CN112751383A CN112751383A CN202011601501.7A CN202011601501A CN112751383A CN 112751383 A CN112751383 A CN 112751383A CN 202011601501 A CN202011601501 A CN 202011601501A CN 112751383 A CN112751383 A CN 112751383A
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- Prior art keywords
- resistor
- charging
- rechargeable battery
- charging circuit
- voltage
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- 239000003990 capacitor Substances 0.000 claims description 31
- 239000002253 acid Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 5
- 230000000087 stabilizing effect Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 230000004044 response Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- 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
- H02J7/00306—Overdischarge 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or 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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charging circuit and an electric fan, wherein a charging battery is charged through the charging circuit, a triode is normally conducted during normal charging, the voltage at two ends of a voltage stabilizing tube continuously rises along with the continuous rise of the voltage of the charging battery, when the voltage of the charging battery rises to a set value, the voltage stabilizing tube is reversely conducted, the base electrode of the triode does not have enough deflection current, the triode is stopped from a saturation state and is cut off, a charging circuit is cut off at the moment, the overcharge protection function is achieved, the overcharge protection circuit is rapid in response, the damage to the charging battery caused by overvoltage in the charging process is avoided, the effective protection charging function is achieved, and the charging circuit is more practical and reliable.
Description
Technical Field
The invention relates to the technical field of electric appliances, in particular to a charging circuit and an electric fan.
Background
In the related technology, the rechargeable electric fan has different capacities and voltage levels of the rechargeable battery, so that the problem of overvoltage of the rechargeable battery is easily caused in the charging process, even the serious problems of explosion and the like of the rechargeable battery can be caused, the product loses the maintenance value, and the service life of the electric fan is shortened.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a charging circuit which effectively realizes the function of overcharge protection and has a practical and reliable structure.
According to an embodiment of the first aspect of the present invention, a charging circuit includes:
a rechargeable battery;
the input end of the charging circuit is connected with a power supply, and the output end of the charging circuit is connected with the rechargeable battery and is used for charging the rechargeable battery;
the protection circuit comprises a voltage regulator tube, a first resistor, a second resistor and a triode, wherein the positive electrode of the rechargeable battery is connected with the negative electrode of the voltage regulator tube, the positive electrode of the voltage regulator tube is connected with the first resistor, the other end of the first resistor is connected with the collector electrode of the triode, the negative electrode of the rechargeable battery is connected with the emitter electrode of the triode, the base electrode of the triode is connected with the positive electrode of the voltage regulator tube, and the collector electrode of the triode is grounded through the second resistor.
According to some embodiments of the invention, the protection circuit further comprises a diode, an anode of the diode is connected with a cathode of the rechargeable battery, and a cathode of the diode is connected with an emitter of the triode.
According to some embodiments of the invention, the charging circuit comprises a bridge rectifier, a first capacitor, a third resistor and a fourth resistor, the third resistor and the fourth resistor are connected in series and are connected between the input terminal and the bridge rectifier, and the first capacitor is connected in parallel with the third resistor and the fourth resistor.
According to some embodiments of the present invention, a filter circuit is further included, and the filter circuit includes a filter capacitor, and the filter capacitor is connected in parallel with the rechargeable battery.
According to some embodiments of the invention, the power supply comprises a first alternating voltage and a second alternating voltage, the first alternating voltage is 220V/50HZ, and the second alternating voltage is 30V/200 HZ.
According to some embodiments of the invention, the rechargeable battery is a lead-acid battery.
According to some embodiments of the present invention, the charging indication circuit further comprises a fifth resistor and an indicator light, the fifth resistor is connected in series with the indicator light, one end of the fifth resistor is connected to a connection point of the first capacitor and the bridge rectifier, and a negative electrode of the indicator light is connected to a negative electrode of the rechargeable battery.
The electric fan according to the second aspect of the present invention comprises a motor and the charging circuit of the first aspect of the present invention, wherein the positive pole of the motor is connected to the positive pole of the rechargeable battery through a switch, and the negative pole of the motor is grounded.
The invention has at least the following beneficial effects:
the charging circuit is used for charging the rechargeable battery, when the charging circuit is normally charged, the triode is normally conducted, the voltage of the rechargeable battery continuously rises, the voltage at the two ends of the voltage stabilizing tube also continuously rises, when the voltage of the rechargeable battery rises to a set value, the voltage stabilizing tube is reversely conducted, the base electrode of the triode is not enough biased to the current, the triode is withdrawn from the saturation state and is cut off, the charging circuit is cut off at the moment, the overcharging protection function is achieved, the response of the overcharging protection circuit is rapid, the phenomenon that the rechargeable battery is damaged due to the overvoltage in the charging process is avoided, the effective protection charging effect is achieved, the electric fan is more practical and reliable.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the following figures and examples, in which:
fig. 1 is a schematic circuit diagram of a charging circuit according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, if there are first, second, etc. described, it is only for the purpose of distinguishing technical features, and it is not understood that relative importance is indicated or implied or that the number of indicated technical features is implicitly indicated or that the precedence of the indicated technical features is implicitly indicated.
In the description of the present invention, it should be noted that unless otherwise explicitly defined, terms such as arrangement, installation, connection and the like should be broadly understood, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, the charging circuit according to the embodiment of the present invention includes a rechargeable battery 120, a charging circuit 110, a protection circuit 130, and a filter circuit, wherein an input end of the charging circuit 110 is connected to a power supply, an output end of the charging circuit 110 is connected to the rechargeable battery 120, the charging circuit 110 is a resistance-capacitance voltage reduction circuit, the rechargeable battery 120 is charged by the charging circuit 110, and the filter circuit includes a filter capacitor, and the filter capacitor is connected in parallel to two ends of the rechargeable battery 120. As shown in fig. 1, BAT is the rechargeable battery 120, and C2 is the filter capacitor.
The protection circuit 130 comprises a voltage regulator tube D1, a first resistor R1, a second resistor R2, a triode Q1 and a diode D2, wherein the positive electrode output end of the charging circuit 110 is connected with the positive electrode of the charging battery 120 and the negative electrode of the voltage regulator tube D1, the positive electrode of the voltage regulator tube D1 is connected with the first resistor R1, the other end of the first resistor R1 is connected with the collector electrode of the triode Q1, the negative electrode of the charging battery 120 is connected with the positive electrode of the diode D2, the negative electrode of the diode D2 is connected with the emitter electrode of the triode Q1, the base electrode of the triode Q1 is connected with the positive electrode of the voltage regulator tube D1, the collector electrode of the triode Q1 is grounded through the second resistor R2, and the triode Q1 is a.
During normal charging, when the rechargeable battery 120 is not fully charged, the base of the triode Q1 is pulled to the ground level through the first resistor R1, the triode Q1 is normally conducted, along with the progress of charging, the voltage of the rechargeable battery 120 continuously rises, the Ucb voltage is also equal to the voltage of the voltage regulator tube D1 plus the Uab, in addition, the Uab voltage is fixed, namely, the voltage at two ends of the voltage regulator tube D1 continuously rises, when the voltage of the rechargeable battery 120 rises to a set value, the voltage regulator tube D1 is conducted in a reverse direction, the base of the triode Q1 does not have enough bias current, the triode Q1 is out of a saturation state and is cut off, at the moment, the charging loop is cut off, the overcharge protection function is achieved, and the overcharge protection circuit 130 responds. The Uab is the voltage between points a and b in fig. 1, and Ucb is the voltage between points c and b in fig. 1.
It can be understood that, when the rechargeable battery 120 is charged, since the moment of power-on is often accompanied by a large inrush current, the inrush current is easy to damage the load; particularly, after the rechargeable battery 120 is discharged too deeply, the rechargeable battery 120 has a large internal resistance and a weak current absorption capability, and the filter capacitor C2 has a good absorption effect on surge current, so that the load can be protected from being damaged.
Referring to fig. 1, the charging circuit 110 includes a bridge rectifier D1, a first capacitor C1, a third resistor R3, and a fourth resistor R4, wherein the third resistor R3 and the fourth resistor R4 are connected in series and then connected in parallel with the first capacitor C1, and a circuit in which the third resistor R3 and the fourth resistor R4 are connected in parallel with the first capacitor C1 is connected between the input end of the charging circuit 110 and the bridge rectifier D1, so as to form a resistance-capacitance voltage dropping circuit, and the charging battery 120 is charged by using the resistance-capacitance voltage dropping circuit.
It can be understood that, when the rechargeable battery 120 is deeply discharged, the internal resistance increases or is dead, and if the normal alternating current 220V/50HZ is adopted for power compensation, the voltage value of the specific alternating current is 220V, and the frequency is 50 HZ. Due to the loss of the clamping effect of the battery voltage, the voltage applied to the two ends of the filter capacitor C2 will continuously rise, which is likely to cause the filter capacitor C2 to explode. Therefore, in the embodiment, when the rechargeable battery 120 needs to be recharged after deep discharge, the ac voltage at the input terminal of the charging circuit 110 is reduced to a lower voltage value, where the lower voltage value is understood to be an ac voltage lower than 220V/50HZ, so as to reduce the charging current. Like this, after reducing the alternating voltage of input, make first electric capacity C1 have relatively little charging current, utilize this less charging current to charge rechargeable battery 120, satisfy rechargeable battery 120's the requirement of charging, thereby play the effect of activation rechargeable battery 120, adopt less electric current to activate rechargeable battery 120 after the overdischarge promptly, because charging current is lower, the voltage boost at rechargeable battery 120 both ends is lower, make the voltage at filter electric capacity C2 both ends also reduce, thereby the easy explosion's of electric capacity risk has been reduced, need not dismantle or change rechargeable battery 120, promote the security and reduce cost of maintenance, make the product resume use value.
Referring to fig. 1, taking the first capacitor C1 as 1uF as an example, during normal charging, the power supply adopts a first ac voltage, the ac of the first ac voltage is 220V/50HZ, and the capacitive reactance Xc of the first capacitor C1 in the charging circuit 110 is: xc 1/(2 pi fC) 1/(2 x 3.14 x 50 x 1 x 10-6) Where f is the frequency and C is the capacitance of the first capacitor C1, 3.2K. The charging current Ic through the first capacitor C1 is: since Ic is 0.9 × U/Xc is 220/3.2K is 61mA, the charging current of the first capacitor C1 is approximately 60 mA. After the rechargeable battery 120 is deeply discharged, the rechargeable battery is charged by using a second alternating voltage, the alternating current of the second alternating voltage is 30V/200HZ, namely the alternating current at the input end is adjusted to be 30V/200HZ, according to the calculation formula of the capacitive reactance Xc, the charging current of the first capacitor C1 can be obtained to be close to 30mA in the same way, so that the rechargeable battery 120 has enough current to be activated, the risk of damage of the filter capacitor C2 can be effectively reduced when the rechargeable battery 120 is charged at low voltage after transient discharge, the safety of the charging circuit 110 is improved, and the product maintenance cost is favorably reduced.
Referring to fig. 1, in the embodiment, the filter capacitor C2 has a capacitance of 220uF/16V, that is, a capacitance of 220uF and a withstand voltage of 16V, the first capacitor C1 has a capacitance of 1uF and a withstand voltage of 400V, and the resistances of the third resistor R3 and the fourth resistor R4 are both 240K. By utilizing the designed capacity of the filter capacitor C2, the alternating current at the input end is adjusted to be 30V/200HZ, and the low-current activation is carried out on the over-discharged rechargeable battery 120, so that the low-voltage high-frequency charging method is realized, and the method is suitable for products charged by adopting a resistance-capacitance voltage reduction circuit.
In the embodiment, the rechargeable battery 120 is a lead-acid battery, and is suitable for use in rechargeable lamps and charging fans, and after the lead-acid battery is over-discharged, the lead-acid battery is charged by using 30V/200HZ alternating current, so that the lead-acid battery can be effectively activated, and the service life of the filter capacitor C2 is not affected. It should be noted that the lead-acid battery is activated by using low-voltage ac, and after a certain period of time, the lead-acid battery is readjusted to be a normal power supply to charge, that is, the 220V/50HZ ac power is recovered for input.
Referring to fig. 1, in an embodiment, the charging circuit 110 includes a charging indication circuit 140, the charging indication circuit 140 includes a fifth resistor R5 and an indicator light, the fifth resistor R5 is connected in series with the indicator light, one end of the fifth resistor R5 is connected to a connection point of the first capacitor C1 and the bridge rectifier D1, and a negative electrode of the indicator light is connected to a negative electrode of the rechargeable battery 120, the indicator light is an LED1 shown in fig. 1, and when charging, the indicator light is turned on to emit light, so as to indicate that the rechargeable battery 120 is in a charging state, thereby improving convenience in use.
Referring to fig. 1, in the embodiment, the rechargeable battery 120 is used to supply power to the load circuit 150, and the load circuit 150 includes a motor M and a control switch, wherein the motor M is a driving motor for driving the blades of the electric fan to rotate. The control switch is connected between the positive pole of the rechargeable battery 120 and the positive pole of the motor M, and the negative pole of the motor M is connected with the negative pole of the rechargeable battery 120. The control switch can control the on-off of the motor M. Specifically, the load circuit 150 has a first current limiting resistor and a second current limiting resistor, and the first current limiting resistor and the second current limiting resistor play a role in current limiting and can protect the motor M. In fig. 1, SW1 is a control switch, the first current-limiting resistor includes a sixth resistor R6 and a seventh resistor R7 connected in parallel, the sixth resistor R6 and the seventh resistor R7 are connected in parallel and then connected between pin 3 of the control switch SW1 and the positive electrode of the motor M, the second current-limiting resistor includes an eighth resistor R8, the second current-limiting resistor is connected between pin 1 of the control switch and the positive electrode of the motor M, the control pin 2 of the control switch SW1 is connected with the positive electrode of the rechargeable battery 120, the control pin 2 can be switched to be connected with pin 1 or pin 3 by the control switch SW1, and specific working principles are not described again.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (8)
1. A charging circuit, comprising:
a rechargeable battery;
the input end of the charging circuit is connected with a power supply, and the output end of the charging circuit is connected with the rechargeable battery and is used for charging the rechargeable battery;
the protection circuit comprises a voltage regulator tube, a first resistor, a second resistor and a triode, wherein the positive electrode of the rechargeable battery is connected with the negative electrode of the voltage regulator tube, the positive electrode of the voltage regulator tube is connected with the first resistor, the other end of the first resistor is connected with the collector electrode of the triode, the negative electrode of the rechargeable battery is connected with the emitter electrode of the triode, the base electrode of the triode is connected with the positive electrode of the voltage regulator tube, and the collector electrode of the triode is grounded through the second resistor.
2. The charging circuit of claim 1, wherein the protection circuit further comprises a diode, wherein an anode of the diode is connected to a cathode of the rechargeable battery, and a cathode of the diode is connected to an emitter of the transistor.
3. The charging circuit of claim 1, wherein the charging circuit comprises a bridge rectifier, a first capacitor, a third resistor, and a fourth resistor, the third resistor and the fourth resistor being connected in series and between the input terminal and the bridge rectifier, and the first capacitor being connected in parallel with the third resistor and the fourth resistor.
4. The charging circuit of claim 3, further comprising a filter circuit, wherein the filter circuit comprises a filter capacitor, and the filter capacitor is connected in parallel with the rechargeable battery.
5. The charging circuit according to claim 3, wherein the power supply includes a first ac voltage of 220V/50HZ and a second ac voltage of 30V/200 HZ.
6. The charging circuit according to any one of claims 1 to 5, wherein the rechargeable battery is a lead-acid battery.
7. The charging circuit according to claim 3, further comprising a charging indication circuit, wherein the charging indication circuit comprises a fifth resistor and an indicator light, the fifth resistor is connected in series with the indicator light, one end of the fifth resistor is connected to the connection point of the first capacitor and the bridge rectifier, and the cathode of the indicator light is connected to the cathode of the rechargeable battery.
8. An electric fan comprising a motor and a charging circuit as claimed in any one of claims 1 to 7, wherein the positive pole of the motor is connected to the positive pole of the rechargeable battery through a switch, and the negative pole of the motor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011601501.7A CN112751383A (en) | 2020-12-29 | 2020-12-29 | Charging circuit and electric fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011601501.7A CN112751383A (en) | 2020-12-29 | 2020-12-29 | Charging circuit and electric fan |
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| Publication Number | Publication Date |
|---|---|
| CN112751383A true CN112751383A (en) | 2021-05-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011601501.7A Pending CN112751383A (en) | 2020-12-29 | 2020-12-29 | Charging circuit and electric fan |
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| Country | Link |
|---|---|
| CN (1) | CN112751383A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201243066Y (en) * | 2008-07-31 | 2009-05-20 | 路克存 | Lead-acid accumulator capacity restorer |
| CN201991798U (en) * | 2010-12-18 | 2011-09-28 | 王福元 | AC-DC dual-purpose electric fan |
| CN205960725U (en) * | 2016-08-22 | 2017-02-15 | 广东金莱特电器股份有限公司 | Take overcharge protection's charging indication circuit |
| CN206211630U (en) * | 2016-09-29 | 2017-05-31 | 广东金莱特电器股份有限公司 | A kind of many charging modes band defencive function lithium battery charging circuits |
| CN208797621U (en) * | 2018-09-07 | 2019-04-26 | 江门市蓬江区金赢科技有限公司 | A kind of novel belt crosses the charging circuit of charging protection function |
-
2020
- 2020-12-29 CN CN202011601501.7A patent/CN112751383A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201243066Y (en) * | 2008-07-31 | 2009-05-20 | 路克存 | Lead-acid accumulator capacity restorer |
| CN201991798U (en) * | 2010-12-18 | 2011-09-28 | 王福元 | AC-DC dual-purpose electric fan |
| CN205960725U (en) * | 2016-08-22 | 2017-02-15 | 广东金莱特电器股份有限公司 | Take overcharge protection's charging indication circuit |
| CN206211630U (en) * | 2016-09-29 | 2017-05-31 | 广东金莱特电器股份有限公司 | A kind of many charging modes band defencive function lithium battery charging circuits |
| CN208797621U (en) * | 2018-09-07 | 2019-04-26 | 江门市蓬江区金赢科技有限公司 | A kind of novel belt crosses the charging circuit of charging protection function |
Non-Patent Citations (1)
| Title |
|---|
| 石玲等: "《电动汽车概论》", 30 June 2020, 机械工业出版社, pages: 3 * |
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