CN106329633B - A kind of over-voltage feedback protection circuit and battery charger - Google Patents
A kind of over-voltage feedback protection circuit and battery charger Download PDFInfo
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- CN106329633B CN106329633B CN201610802504.4A CN201610802504A CN106329633B CN 106329633 B CN106329633 B CN 106329633B CN 201610802504 A CN201610802504 A CN 201610802504A CN 106329633 B CN106329633 B CN 106329633B
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- 239000003990 capacitor Substances 0.000 claims description 30
- 230000005611 electricity Effects 0.000 claims description 17
- 230000000694 effects Effects 0.000 claims description 3
- 230000006870 function Effects 0.000 description 6
- 230000005669 field effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- H02J7/0085—
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- H02J7/0086—
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a kind of over-voltage feedback protection circuit and battery charger, which includes input terminal Vin, power switch tube Q1, first resistor R1, second resistance R2,3rd resistor R3, comparator OP1, the end output end vo ut and GND；The input terminal Vin is connect with the first end of the first resistor R1, the first end of power switch tube Q1；The first input end of the comparator OP1 is connect with the first end of the second end of the first resistor R1, the second resistance R2, and the second end of the second resistance R2 is connect with the end GND；The second input terminal of the comparator OP1 is connect with the second end of the 3rd resistor R3, output end vo ut；The output end of the comparator OP1 is connect with the second end of the power switch tube Q1；The third end of the power switch tube Q1 is connect with the first end of 3rd resistor R3.Over-voltage feedback protection circuit of the invention can effectively provide over-voltage, overcurrent protection function, reduce the loss of power, reduce EMI and RF.
Description
Technical field
The present invention relates to electronic technology field more particularly to a kind of over-voltage feedback protection circuits and battery charger.
Background technique
With the rapid development of consumer electronics product, consumer is more and more frequent using handheld device.Handheld device electricity
When the depleted of energy in pond, it need to be charged using charging unit.Existing charging unit has the following problems: first is that precision is inadequate
Height, second is that cannot effectively end power transmission, third is that circuit is complicated, higher cost.Such as: after the electricity of handheld device, which fills, satisfies, fill
Electric current can gradually reduce.But the battery of handheld device is in a smaller current working condition, this situation is to electricity
Pond itself has certain loss, while also having certain consumption to electricity.
Summary of the invention
It, can be well it is a primary object of the present invention to propose a kind of over-voltage feedback protection circuit and battery charger
Solve the problems, such as that precision present in existing charging unit is not high enough, cannot effectively end power transmission.
To achieve the above object, a kind of over-voltage feedback protection circuit that first aspect present invention provides, which includes defeated
Enter to hold Vin, power switch tube Q1, first resistor R1, second resistance R2,3rd resistor R3, comparator OP1, output end vo ut with
And the end GND；
The input terminal Vin is connect with the first end of the first resistor R1, the first end of power switch tube Q1；
The of the second end of the first input end of the comparator OP1 and the first resistor R1, the second resistance R2
One end connection, the second end of the second resistance R2 are connect with the end GND；
The second input terminal of the comparator OP1 is connect with the second end of the 3rd resistor R3, output end vo ut；
The output end of the comparator OP1 is connect with the second end of the power switch tube Q1；
The third end of the power switch tube Q1 is connect with the first end of 3rd resistor R3.
In conjunction with the embodiment of the present invention in a first aspect, in the first implementation of the first aspect of the embodiment of the present invention,
The power switch tube Q1 includes one of field effect transistor, bipolar junction transistor.
In conjunction with the embodiment of the present invention in a first aspect, in second of implementation of the first aspect of the embodiment of the present invention,
The current range of the output end vo ut is 50mA-2A.
In conjunction with the embodiment of the present invention in a first aspect, in the third implementation of the first aspect of the embodiment of the present invention,
The comparator OP1 includes one kind of in-phase voltage comparator, reverse voltage comparator.
In conjunction with the embodiment of the present invention in a first aspect, in the 4th kind of implementation of the first aspect of the embodiment of the present invention,
The circuit further includes first capacitor；
One end of the first capacitor is connect with the second end of the 3rd resistor R3, the output end vo ut；Described
The other end of one capacitor is connect with the end GND.
In conjunction with the embodiment of the present invention in a first aspect, in the 5th kind of implementation of the first aspect of the embodiment of the present invention,
The circuit further includes the second capacitor；
One end of second capacitor is connect with the second end of the 3rd resistor R3, the output end vo ut；Described
The other end of two capacitors is connect with the end GND.
In conjunction with the embodiment of the present invention in a first aspect, in the 6th kind of implementation of the first aspect of the embodiment of the present invention,
The circuit further includes third capacitor；
The third capacitor and the input terminal Vin, the first end of the first resistor R1 and the power switch tube Q1
First end connection；The other end of the third capacitor is connect with the end GND.
In conjunction with the embodiment of the present invention in a first aspect, in the 7th kind of implementation of the first aspect of the embodiment of the present invention,
The circuit further includes the 4th capacitor；
4th capacitor is connected in parallel with the second resistance R2.
In conjunction with the embodiment of the present invention in a first aspect, in the 8th kind of implementation of the first aspect of the embodiment of the present invention,
The circuit further includes the first inductance；
First inductance connection is between the second end and the output end vo ut of the 3rd resistor R3.
In addition, to achieve the above object, second aspect of the embodiment of the present invention provides a kind of battery charger, the circuit packet
Include charge power supply, rechargeable battery and any of the above-described over-voltage feedback protection circuit；
The charge power supply is connect with the input terminal Vin of the over-voltage feedback protection circuit；The rechargeable battery with it is described
The output end vo ut connection of over-voltage feedback protection circuit.
Over-voltage feedback protection circuit and battery charger provided by the invention can effectively provide over-voltage, overcurrent is protected
Protective function reduces the loss of power, reduces EMI and RF.
Detailed description of the invention
Fig. 1 is the over-voltage feedback protection circuit structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the battery charger structural schematic diagram of the embodiment of the present invention；
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.
Referring to FIG. 1, the embodiment of the present invention provides a kind of over-voltage feedback protection circuit, over-voltage feedback protection circuit includes defeated
Enter to hold Vin, power switch tube Q1, first resistor R1, second resistance R2,3rd resistor R3, comparator OP1, output end vo ut with
And the end GND；
Input terminal Vin is connect with the first end of the first end of first resistor R1, power switch tube Q1；The of comparator OP1
One input terminal is connect with the first end of the second end of first resistor R1, second resistance R2；The second end of second resistance R2 and the end GND
Connection；The second input terminal of comparator OP1 is connect with the second end of 3rd resistor R3, output end vo ut；The output of comparator OP1
End is connect with the second end of power switch tube Q1；The third end of power switch tube Q1 is connect with the first end of 3rd resistor R3.
In the present embodiment, input terminal Vin is that direct current is inputted or handed over for receiving external voltage input, the external voltage
Circulation is changed to the input after direct current.Output end vo ut is for output voltage to external device (ED).
In the present embodiment, first resistor, second resistance, the first end and second end of 3rd resistor are intended merely to description side
Just, it is not used to limit resistance.
In the present embodiment, power switch tube Q1 includes field effect transistor.The first end of above-mentioned power switch tube Q1,
Two ends, third end are respectively the drain electrode of field effect transistor, grid, source electrode.
In the present embodiment, the current range of output end vo ut is 50mA-2A.
In the present embodiment, comparator OP1 is in-phase voltage comparator.The first input end of above-mentioned comparator OP1 is same
The cathode of phase voltage comparator；The second input terminal of comparator OP1 is the anode of in-phase voltage comparator.
Those skilled in the art is to be understood that: in other embodiments, power switch tube Q1 can be ambipolar crystalline substance
Body pipe.Comparator OP1 can be reverse voltage comparator.
It refer again to shown in Fig. 1, the over-voltage feedback protection circuit of the present embodiment, may also include first capacitor C1, the first electricity
The one end for holding C1 is connect with the second end of 3rd resistor R3, output end vo ut；The other end of first capacitor C1 is connect with the end GND.
First capacitor C1 has the function of stabilizing the output voltage and filter, and the effect of prevention ESD, it can be ensured that rear end uses peace
Entirely, the stability of system is increased.
It refer again to shown in Fig. 1, the over-voltage feedback protection circuit of the present embodiment, may also include the second capacitor C2, the second electricity
The one end for holding C2 is connect with the second end of 3rd resistor R3, output end vo ut；The other end of second capacitor C2 is connect with the end GND.
Second capacitor C2 has filter high frequency, reduces the effect of EMI.
It refer again to shown in Fig. 1, the over-voltage feedback protection circuit of the present embodiment, may also include third capacitor C3, third electricity
Hold C3 to connect with the first end of input terminal Vin, the first end of first resistor R1 and power switch tube Q1；Third capacitor C3's is another
End is connect with the end GND.Third capacitor C3 has the function of stablizing input voltage and filtering, it is ensured that input voltage is not by the external world
Interference and rear end variation, will not influence front voltage.
It refer again to shown in Fig. 1, the over-voltage feedback protection circuit of the present embodiment, may also include the 4th capacitor C4, the 4th electricity
Hold C4 and second resistance R2 to be connected in parallel.4th capacitor C4 can prevent second resistance R2 both end voltage mutation phenomenon.
It refer again to shown in Fig. 1, the over-voltage feedback protection circuit of the present embodiment, may also include the first inductance L1, the first electricity
Sense L1 is connected between the second end of 3rd resistor R3 and output end vo ut.First inductance L1 has the function of filtering, while can
To reduce EMI and RF.
It should be noted that first capacitor C1, the second capacitor C2, third capacitor C3 and the first inductance L1 can be arranged in simultaneously
In over-voltage feedback protection circuit, it can also be configured respectively according to actual needs.
Over-voltage feedback protection circuit of the invention can effectively provide over-voltage, overcurrent protection function, reduce power supply damage
Consumption reduces EMI and RF.
As described in Figure 2, the embodiment of the present invention provides a kind of battery charger, which includes charge power supply, charging electricity
Pond and over-voltage feedback protection circuit；
The charge power supply is connect with the input terminal Vin of the over-voltage feedback protection circuit；The rechargeable battery with it is described
The output end vo ut connection of over-voltage feedback protection circuit.
Over-voltage feedback protection circuit, is described in detail in front, and therefore not to repeat here.
As exemplary, in the present embodiment, input terminal Vin value can be 5V, and the resistance value value of V second resistance R2 can be
9K；The resistance value value of first resistor R1 can be 1K.Therefore, the first input end of comparator OP1 can be 4.5V.
When charging current is greater than 100mA, the second input terminal voltage of comparator OP1 is less than 4.5V, according to comparator OP1
Characteristic: when comparator OP1 first input end voltage value be greater than the second input terminal voltage of comparator OP1 value when, comparator OP1 is defeated
Outlet is 0V, and then power switch tube Q1 is caused to be connected, and circuit charges normal.
When charging current is less than 100mA, the second input terminal voltage of comparator OP1 is greater than 4.5V, according to comparator OP1
Characteristic: when comparator OP1 first input end voltage value be less than the second input terminal voltage of comparator OP1 value when, comparator OP1 is defeated
Outlet is 5V, and then power switch tube Q1 is caused to end, and circuit stops charging.
Battery charger of the invention can effectively provide over-voltage, overcurrent protection function, reduce the loss of power, drop
Low EMI and RF.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (9)
1. a kind of over-voltage feedback protection circuit, which is characterized in that the circuit includes input terminal Vin, power switch tube Q1, the first electricity
Hinder R1, second resistance R2,3rd resistor R3, comparator OP1, the end output end vo ut and GND；
The input terminal Vin is connect with the first end of the first end of the first resistor R1, the power switch tube Q1；
Second end, the first end of the second resistance R2 of the first input end of the comparator OP1 and the first resistor R1
Connection；
The second end of the second resistance R2 is connect with the end GND；
The second input terminal of the comparator OP1 is connect with the second end of the 3rd resistor R3, the output end vo ut；
The output end of the comparator OP1 is connect with the second end of the power switch tube Q1；
The third end of the power switch tube Q1 is connect with the first end of the 3rd resistor R3；
The circuit further includes the first inductance；
First inductance connection is between the second end and the output end vo ut of the 3rd resistor R3.
2. a kind of over-voltage feedback protection circuit according to claim 1, which is characterized in that the power switch tube Q1 is field
One of effect transistor, bipolar junction transistor.
3. a kind of over-voltage feedback protection circuit according to claim 1, which is characterized in that the electric current of the output end vo ut
Range is 50mA-2A.
4. a kind of over-voltage feedback protection circuit according to claim 1, which is characterized in that the comparator OP1 is same phase
One kind of voltage comparator, reverse voltage comparator.
5. a kind of over-voltage feedback protection circuit according to claim 1, which is characterized in that the circuit further includes the first electricity
Hold；
One end of the first capacitor is connect with the second end of the 3rd resistor R3, the output end vo ut；First electricity
The other end of appearance is connect with the end GND.
6. a kind of over-voltage feedback protection circuit according to claim 1, which is characterized in that the circuit further includes the second electricity
Hold；
One end of second capacitor is connect with the second end of the 3rd resistor R3, the output end vo ut；Second electricity
The other end of appearance is connect with the end GND.
7. a kind of over-voltage feedback protection circuit according to claim 1, which is characterized in that the circuit further includes third electricity
Hold；
The of the third capacitor and the input terminal Vin, the first end of the first resistor R1 and the power switch tube Q1
One end connection；The other end of the third capacitor is connect with the end GND.
8. a kind of over-voltage feedback protection circuit according to claim 1, which is characterized in that the circuit further includes the 4th electricity
Hold；
4th capacitor is connected in parallel with the second resistance R2.
9. a kind of battery charger, which is characterized in that the circuit includes that charge power supply, rechargeable battery and claim 1-8 appoint
Over-voltage feedback protection circuit described in one；
The charge power supply is connect with the input terminal Vin of the over-voltage feedback protection circuit；The rechargeable battery and the over-voltage
The output end vo ut connection of feedback protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610802504.4A CN106329633B (en) | 2016-09-05 | 2016-09-05 | A kind of over-voltage feedback protection circuit and battery charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610802504.4A CN106329633B (en) | 2016-09-05 | 2016-09-05 | A kind of over-voltage feedback protection circuit and battery charger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106329633A CN106329633A (en) | 2017-01-11 |
| CN106329633B true CN106329633B (en) | 2019-02-22 |
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| CN201610802504.4A Active CN106329633B (en) | 2016-09-05 | 2016-09-05 | A kind of over-voltage feedback protection circuit and battery charger |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112382249B (en) * | 2020-11-13 | 2022-04-26 | 昆山龙腾光电股份有限公司 | Gate drive unit, gate drive circuit and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593963A (en) * | 2008-05-30 | 2009-12-02 | 鸿富锦精密工业（深圳）有限公司 | Overvoltage crowbar |
| CN202797874U (en) * | 2012-07-03 | 2013-03-13 | 青岛海信移动通信技术股份有限公司 | Over-voltage protection circuit and mobile terminal |
| CN203166467U (en) * | 2013-03-20 | 2013-08-28 | 向智勇 | Overvoltage protection circuit |
| CN203278357U (en) * | 2013-06-14 | 2013-11-06 | 成都锐奕信息技术有限公司 | Charging port circuit with overvoltage protection function |
| CN104113039A (en) * | 2013-04-19 | 2014-10-22 | 鸿富锦精密电子(天津)有限公司 | Over-voltage protection circuit |
-
2016
- 2016-09-05 CN CN201610802504.4A patent/CN106329633B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593963A (en) * | 2008-05-30 | 2009-12-02 | 鸿富锦精密工业（深圳）有限公司 | Overvoltage crowbar |
| CN202797874U (en) * | 2012-07-03 | 2013-03-13 | 青岛海信移动通信技术股份有限公司 | Over-voltage protection circuit and mobile terminal |
| CN203166467U (en) * | 2013-03-20 | 2013-08-28 | 向智勇 | Overvoltage protection circuit |
| CN104113039A (en) * | 2013-04-19 | 2014-10-22 | 鸿富锦精密电子(天津)有限公司 | Over-voltage protection circuit |
| CN203278357U (en) * | 2013-06-14 | 2013-11-06 | 成都锐奕信息技术有限公司 | Charging port circuit with overvoltage protection function |
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| CN106329633A (en) | 2017-01-11 |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: InfoVision Optoelectronics(Kunshan)Co.,Ltd. Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |
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