CN209217735U - Charger output voltage auto-adjusting circuit - Google Patents
Charger output voltage auto-adjusting circuit Download PDFInfo
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- CN209217735U CN209217735U CN201821295956.9U CN201821295956U CN209217735U CN 209217735 U CN209217735 U CN 209217735U CN 201821295956 U CN201821295956 U CN 201821295956U CN 209217735 U CN209217735 U CN 209217735U
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Abstract
The utility model relates to battery charging fields, more particularly to charger output voltage auto-adjusting circuit, it include: filter rectifier, transforming circuit, detection control circuit, voltage feedback circuit, PWM drive circuit and battery management circuit, the output end of the input terminal connection power supply of the filter rectifier；The output end of the transforming circuit connection filter rectifier and the output end of PWM drive circuit；Output end, battery and the input terminal for detecting control circuit of the battery management circuit connection transforming circuit；The output end of the detection control circuit connection transforming circuit and the input terminal of voltage feedback circuit；The input terminal of the voltage feedback circuit connection PWM drive circuit and the output end of transforming circuit.The utility model has the advantages that output voltage is increased with the raising of cell voltage, avoid charger is charged always with maximum output voltage the utility model, while not increasing the charging time, saves electric energy.
Description
Technical field
The utility model relates to battery charging field more particularly to charger output voltage auto-adjusting circuits.
Background technique
Electric tool currently on the market, the voltage of the lithium battery chargers such as garden instrument class are all that univoltage fixation is defeated
Out, the fixed output of maximum voltage, the electric energy of consumption are more always for charger.
When charging to meet to different joint numbers or different voltages battery, by the way of be adjust electric current mode go to
Different joint numbers or the charging of different voltages battery gradually decrease charging current simulation constant-voltage charge when battery will fill full.It is this
Charging modes charging current is ladder decline, and electric current decline is not linear, and such battery, which fills the full time, to be extended.
Utility model content
To solve the above problems, the utility model proposes a kind of charger output voltage auto-adjusting circuits.
Charger output voltage auto-adjusting circuit, comprising: filter rectifier, transforming circuit, detection control circuit, electricity
Feedback circuit, PWM drive circuit and battery management circuit are pressed,
The output end of the input terminal connection power supply of the filter rectifier；
The output end of the transforming circuit connection filter rectifier and the output end of PWM drive circuit；
Output end, battery and the input terminal for detecting control circuit of the battery management circuit connection transforming circuit；
The output end of the detection control circuit connection transforming circuit and the input terminal of voltage feedback circuit；
The input terminal of the voltage feedback circuit connection PWM drive circuit and the output end of transforming circuit.
Preferably, the output voltage auto-adjusting circuit further include:
Switching circuit, the output end of the switching circuit connection transforming circuit, the input terminal of battery management circuit and inspection
Survey the output end of control circuit.
Preferably, the switching circuit includes:
Relay RY1, including coil, the first contact and the second contact, the leakage of one end connection metal-oxide-semiconductor Q3 of the coil
Pole, the other end connect the end VS and one end of resistance R4, the output end of the first contact connection transforming circuit, second touching
The input terminal of point connecting detection control circuit and the input terminal of battery management circuit；
Resistance R4, the input terminal of other end connecting detection control circuit；
Metal-oxide-semiconductor Q3, source electrode connect the end VSS, the output end of grid connecting detection control circuit.
Preferably, the transforming circuit includes:
Transformer, the transformer include input main winding, output main winding and output auxiliary winding；
The output end of the first end connection rectification circuit of the input main winding, second end connect the defeated of PWM drive circuit
Outlet, export main winding first end connection voltage feedback circuit input terminal and switching circuit input terminal, second
The end connection end VSS；
The first end of the output auxiliary winding connects the end VF, second end ground connection, and third end connects the end VS, the connection of the 4th end
The end VSS.
Preferably, the battery management circuit includes:
Regulated power supply, first end connect the input terminal of battery and the output end of switching circuit, second end connection first
The first end of MCU, third end connect the end B-；
First MCU, the input terminal of second end connecting detection control circuit, third end connect the end B-.
Preferably, the detection control circuit includes:
2nd MCU, first end connect the output end of battery management circuit；Second end, third end connection switch circuit, the
The output end of four end connection switch circuits, the 5th end connect the end VSS, the input terminal of six end connecting voltage feedback circuit.
Preferably, the voltage feedback circuit includes:
The anode of photoelectrical coupler, including light emitting diode and phototriode, the light emitting diode passes through resistance R1
Connect the end VS, the cathode of the cathode connection voltage-reference of light emitting diode；
Voltage-reference, anode connect the end VSS, and reference end is separately connected one end of resistance R2, R3；
Resistance R2, R3, the output end of the other end connection transforming circuit of resistance R2, the other end of resistance R3 connect metal-oxide-semiconductor
The drain electrode of Q2；
Metal-oxide-semiconductor Q2, the output end of grid connecting detection control circuit, source electrode connect the end VSS.
Preferably, the PWM drive circuit includes:
3rd MCU, first end connect the end VF, and second end connects the grid of metal-oxide-semiconductor Q1, and third end connects voltage tune
Save the output end of feed circuit, the 4th end ground connection；
The second end of metal-oxide-semiconductor Q1, source electrode ground connection and output auxiliary winding, the second of drain electrode connection input main winding
End.
By using the utility model, following effect may be implemented: according to battery real-time voltage parameter regulation, it exports PWM
Signal dutyfactor increases the output voltage of transforming circuit with the raising of cell voltage, avoids the charger beginning
It is charged eventually with maximum output voltage, while not increasing the charging time, saves electric energy；When the voltage for detecting battery
When reaching its saturation voltage, control relay RY1 is opened, and charger stopping charges the battery, and avoids over-charging of battery；It is charging
When device is inserted into battery pack, according to battery real-time voltage state modulator output voltage, so that output voltage and battery real-time voltage phase
It is close, relay RY1 conducting is then controlled, the opening moment in relay RY1 is avoided, because of the electricity at the both ends relay RY1
Pressure difference is larger and causes to damage in contact generation arc phenomenon.
Detailed description of the invention
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.
Fig. 1 is the structural schematic diagram of the utility model embodiment；
Fig. 2 is the connection schematic diagram of switching circuit in the utility model embodiment；
Fig. 3 is the circuit diagram of the utility model embodiment.
Specific embodiment
Below in conjunction with attached drawing, the technical solution of the utility model is further described, but the utility model and unlimited
In these embodiments.
The utility model provides a kind of charger output voltage auto-adjusting circuit, as shown in Figure 1, comprising: filtering is whole
Current circuit, transforming circuit, detection control circuit, voltage feedback circuit, PWM drive circuit and battery management circuit.Filter
The output end of the input terminal connection power supply of wave rectification circuit；Transforming circuit connects the output end of filter rectifier and PWM drives
The output end of dynamic circuit；Battery management circuit connects the output end, battery and the input terminal for detecting control circuit of transforming circuit；
Detect the output end of control circuit connection transforming circuit and the input terminal of voltage feedback circuit；Voltage feedback circuit
Connect the input terminal of PWM drive circuit and the output end of transforming circuit.
As the preferred of the present embodiment, charger output voltage auto-adjusting circuit further includes switching circuit.Such as Fig. 2 institute
Show, switching circuit connects the output end of the output end of transforming circuit, the input terminal of battery management circuit and detection control circuit.
Wherein, filter rectifier is used to be filtered rectification to the alternating current of the output end of power supply；Detect control circuit
Battery saturation voltage signal is obtained by battery management circuit, and battery real-time voltage parameter is obtained by detection；Voltage is adjusted
Feed circuit exports feedback signal according to battery saturation voltage signal and battery real-time voltage parameter；PWM drive circuit according to
Feedback signal controls transforming circuit output voltage, to realize that output voltage is linearly increased with the raising of cell voltage, and not
More than its saturation voltage, to realize under the premise of not extending the charging time, charge to the battery of different saturation voltages, the same to time
Energy consumption is saved.In addition, when charger is inserted into battery pack, according to the output of battery real-time voltage state modulator transforming circuit electricity
Pressure, so that the output voltage of transforming circuit is close with battery real-time voltage, then turns on the switch circuit again, avoids in relay
The opening moment of device RY1 causes to damage in contact generation arc phenomenon because the voltage difference at the both ends relay RY1 is larger.
With reference to the accompanying drawing 3, filter rectifier, transforming circuit, switching circuit, detection control circuit, voltage are adjusted
Feed circuit, the circuit connection of PWM drive circuit and battery management circuit and working principle are described in detail.
Filter rectifier includes: diode D1, D2, D3, D4 and capacitor C1.Diode D1, D2, D3, D4 composition are whole
The alternating current that current circuit exports power supply rectifies, and capacitor C1 plays the role of to the current filtering after rectification.
Transforming circuit includes: transformer T1, as it is also preferable to include diode D5, D6, D7, capacitor C2, C3, C4, C5.
Transformer includes input main winding, output main winding and output auxiliary winding.The first end for inputting main winding connects rectification circuit
Output end, second end connect PWM drive circuit output end, export main winding first end connection voltage feedback circuit
Input terminal and switching circuit input terminal, second end connect the end VSS；The first end for exporting auxiliary winding connects the end VF, uses
It powers in PWM drive circuit, second end ground connection, third end connects the end VS, and the 4th end connects the end VSS.Diode D7 forward direction connects
The first end in output auxiliary winding is connect, diode D6 forward direction is connected to the third end of output auxiliary winding, and diode D6's is negative
Pole connects the common end VS, and the common end VS is connect with voltage feedback circuit and switching circuit, for supplying power for.Capacitor C2
It is connected between the first end and second end of input main winding, capacitor C4 is connected to the second end and diode D5 of output main winding
Cathode between, capacitor C3 is connected between the first end and second end of output auxiliary winding, capacitor C5 be connected to output it is main around
Between the 4th end and the cathode of diode D6 of group.Transforming circuit is adjusted anti-while output voltage Vout is adjusted to voltage
Current feed circuit, PWM drive circuit and switching circuit power supply.
Switching circuit includes: relay RY1, resistance R4, metal-oxide-semiconductor Q3.Relay RY1, including coil, the first contact and
Second contact, the drain electrode of one end connection metal-oxide-semiconductor Q3 of the coil, the other end connect the end VS and one end of resistance R4, resistance
The source electrode of the other end connecting detection control circuit of R4, metal-oxide-semiconductor Q3 connects the end VSS, grid connecting detection control circuit.MOS
The control of pipe Q3 whether be connected by detection control circuit, when metal-oxide-semiconductor Q3 conducting, relay RY1 closure conducting,
When metal-oxide-semiconductor Q3 is disconnected, relay RY1 disconnection is not turned on.
Battery management circuit is set to battery pack, and the end B- and the end B+ are two charging terminals, and the end ID is signal terminal.Battery
Managing circuit includes: regulated power supply, the first MCU.Regulated power supply, first end connect battery input terminal and switching circuit it is defeated
Outlet, second end connect the first end of the first MCU, and third end connects the end B-；First MCU, second end connecting detection control
The input terminal of circuit processed, third end connect the end B-.First MCU passes through the end ID connecting detection control circuit, output battery saturation electricity
Press signal.First MCU storage inside has battery saturation voltage information, and the battery storage of different saturation voltages has different saturation electricity
Information is pressed, the first MCU converts electric signal for battery saturation voltage information and exports by the end ID.
Detection control circuit includes: the 2nd MCU, and first end connects the output end of battery management circuit；Second end, third
Connection switch circuit, the output end of the 4th end connection switch circuit are held, the 5th end connects the end VSS, and six end connecting voltage is adjusted
The input terminal of feed circuit.Preferably, detection control circuit further include: resistance R5, R6 of series connection, resistance R5, R6 group
At bleeder circuit.One end of resistance R5 connects the 4th end of the 2nd MCU, the output end of other end connection switch circuit, resistance R6
One end connection resistance R5, the 2nd MCU the 4th end, the other end connect the 2nd MCU the 5th end and the end VSS.
The output end of the first end connection battery management circuit of 2nd MCU obtains its battery saturation voltage signal, and according to
Battery saturation voltage signal sets the range of the 6th end output pwm signal duty ratio, to finally make the output of transforming circuit
Voltage does not exceed battery saturation voltage, to ensure that battery will not be overcharged.The second end of 2nd MCU and third end with open
Metal-oxide-semiconductor Q3, relay RY1, the resistance R4 on powered-down road constitute circuit.The 4th end of 2nd MCU is after the decompression of resistance R5, R6
Obtain battery real-time voltage parameter.When charger is inserted into battery pack, control circuit is detected according to battery real-time voltage parameter control
Then the output voltage of transforming circuit processed passes through second so that the output voltage of transforming circuit is close with battery real-time voltage
End control metal-oxide-semiconductor Q3 closure, relay RY1 is closed at this time, the opening moment in relay RY1 is avoided, because of relay RY1
The voltage difference at both ends is larger and causes to damage in contact generation arc phenomenon.On the other hand, when detecting battery real-time voltage
When parameter reaches battery saturation voltage, relay RY1 is controlled by metal-oxide-semiconductor Q3 and is opened, charger stopping charges the battery.Second
The 6th end of MCU finally makes the output of transforming circuit according to its output pwm signal duty ratio of battery real-time voltage parameter regulation
Voltage is increased with the raising of cell voltage, and avoiding charger is charged always with maximum output voltage, is not being increased
While charging time, electric energy is saved.
Voltage feedback circuit includes: photoelectrical coupler, resistance R1, R2, R3, voltage-reference, metal-oxide-semiconductor Q2.Photoelectricity
Coupler includes light emitting diode and phototriode.The anode of light emitting diode passes through the end resistance R1 connection VS, light-emitting diodes
The cathode of the cathode connection voltage-reference of pipe；Voltage-reference, anode connect the end VSS, and reference end is separately connected resistance
One end of R2, R3, the output end of the other end connection transforming circuit of resistance R2, the leakage of the other end connection metal-oxide-semiconductor Q2 of resistance R3
Pole；Metal-oxide-semiconductor Q2, the output end of grid connecting detection control circuit, source electrode connect the end VSS.
Resistance R2, R3 constitute voltage network.The reference voltage in voltage and voltage-reference U3 on resistance R3 into
Row compares, and only when the reference voltage that the voltage on resistance R3 is more than in voltage-reference U3, voltage-reference just has electric current
Pass through.When LEDs ON, phototriode can be just connected.Detection control circuit exports PMW according to cell voltage
Signal, after metal-oxide-semiconductor Q2, the voltage on resistance R3 increases, after voltage signal passes through photoelectrical coupler, PWM drive circuit root
It according to received feedback signal, controls transformer T1 output voltage Vout and increases, finally realize output voltage Vout with battery electricity
The increase of pressure and increase.If the voltage on resistance R3 is less than the reference voltage in voltage-reference U3, transformer T1's is defeated
Voltage Vout is fixed out.
PWM drive circuit includes: the 3rd MCU, metal-oxide-semiconductor Q1.3rd MCU, first end connect the end VF, second end connection
The grid of metal-oxide-semiconductor Q1, third end connect the output end of voltage feedback circuit, the 4th end ground connection；Metal-oxide-semiconductor Q1, source
The second end of pole ground connection and output auxiliary winding, the second end of drain electrode connection input main winding.3rd MCU is anti-by judgement
Feedback signal adjustment metal-oxide-semiconductor Q1PWM frequency and duty ratio are suitble to obtain to the output voltage values Vout of present battery packet charging.
Those skilled in the art of the present invention can do described specific embodiment various
The similar mode of modify or supplement or adopt substitutes, but without departing from the spirit of the present application or surmounts appended right and want
Seek range defined in book.
Claims (7)
1. charger output voltage auto-adjusting circuit characterized by comprising filter rectifier, transforming circuit, detection control
Circuit, voltage feedback circuit, PWM drive circuit and battery management circuit processed,
The output end of the input terminal connection power supply of the filter rectifier；
The output end of the transforming circuit connection filter rectifier and the output end of PWM drive circuit；
Output end, battery and the input terminal for detecting control circuit of the battery management circuit connection transforming circuit；
The output end of the detection control circuit connection transforming circuit and the input terminal of voltage feedback circuit；
The input terminal of the voltage feedback circuit connection PWM drive circuit and the output end of transforming circuit.
2. charger output voltage auto-adjusting circuit according to claim 1, which is characterized in that the output voltage is certainly
It is dynamic to adjust circuit further include:
Switching circuit, the output end of the switching circuit connection transforming circuit, the input terminal of battery management circuit and detection control
The output end of circuit processed.
3. charger output voltage auto-adjusting circuit according to claim 2, which is characterized in that the transforming circuit packet
It includes:
Transformer, the transformer include input main winding, output main winding and output auxiliary winding；
The output end of the first end connection rectification circuit of the input main winding, second end connect the output end of PWM drive circuit,
Export the input terminal of the first end connection voltage feedback circuit of main winding and the input terminal of switching circuit, second end connection
The end VSS；
The first end of the output auxiliary winding connects the end VF, second end ground connection, and third end connects the end VS, and the 4th end connects VSS
End.
4. charger output voltage auto-adjusting circuit according to claim 2, which is characterized in that the battery management electricity
Road includes:
Regulated power supply, first end connect the input terminal of battery and the output end of switching circuit, and second end connects the first MCU's
First end, third end connect the end B-；
First MCU, the input terminal of second end connecting detection control circuit, third end connect the end B-.
5. charger output voltage auto-adjusting circuit according to claim 2, which is characterized in that the detection control electricity
Road includes:
2nd MCU, first end connect the output end of battery management circuit；Second end, third end connection switch circuit, the 4th end
The output end of connection switch circuit, the 5th end connect the end VSS, the input terminal of six end connecting voltage feedback circuit.
6. charger output voltage auto-adjusting circuit according to claim 1, which is characterized in that the voltage adjusts anti-
Current feed circuit includes:
The anode of photoelectrical coupler, including light emitting diode and phototriode, the light emitting diode is connected by resistance R1
The end VS, the cathode of the cathode connection voltage-reference of light emitting diode；
Voltage-reference, anode connect the end VSS, and reference end is separately connected one end of resistance R2, R3；
Resistance R2, R3, the output end of the other end connection transforming circuit of resistance R2, the other end connection metal-oxide-semiconductor Q2's of resistance R3
Drain electrode；
Metal-oxide-semiconductor Q2, the output end of grid connecting detection control circuit, source electrode connect the end VSS.
7. charger output voltage auto-adjusting circuit according to claim 3, which is characterized in that the PWM driving electricity
Road includes:
3rd MCU, first end connect the end VF, and second end connects the grid of metal-oxide-semiconductor Q1, and third end connects voltage and adjusts instead
The output end of current feed circuit, the 4th end ground connection；
The second end of metal-oxide-semiconductor Q1, source electrode ground connection and output auxiliary winding, the second end of drain electrode connection input main winding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821295956.9U CN209217735U (en) | 2018-08-13 | 2018-08-13 | Charger output voltage auto-adjusting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821295956.9U CN209217735U (en) | 2018-08-13 | 2018-08-13 | Charger output voltage auto-adjusting circuit |
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| Publication Number | Publication Date |
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| CN209217735U true CN209217735U (en) | 2019-08-06 |
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| CN201821295956.9U Active CN209217735U (en) | 2018-08-13 | 2018-08-13 | Charger output voltage auto-adjusting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109256829A (en) * | 2018-08-13 | 2019-01-22 | 浙江特康电子科技有限公司 | Charger output voltage auto-adjusting circuit |
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2018
- 2018-08-13 CN CN201821295956.9U patent/CN209217735U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109256829A (en) * | 2018-08-13 | 2019-01-22 | 浙江特康电子科技有限公司 | Charger output voltage auto-adjusting circuit |
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Denomination of utility model: Charger output voltage automatic adjustment circuit Effective date of registration: 20220809 Granted publication date: 20190806 Pledgee: Agricultural Bank of China Limited by Share Ltd. Jiaxing branch Pledgor: ZHEJIANG TEKANG ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: Y2022980012195 |