CN204441986U - The charger of charging voltage and electric current is regulated and controled with non-essential resistance programming - Google Patents
The charger of charging voltage and electric current is regulated and controled with non-essential resistance programming Download PDFInfo
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- CN204441986U CN204441986U CN201520121204.0U CN201520121204U CN204441986U CN 204441986 U CN204441986 U CN 204441986U CN 201520121204 U CN201520121204 U CN 201520121204U CN 204441986 U CN204441986 U CN 204441986U
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Abstract
The utility model discloses the charger of a kind of non-essential resistance programming regulation and control charging voltage and electric current, comprise Vref contact, Vprog contact, the Iprog contact of drawing at charger external; Operational amplifier U4D makes Isobarically Control, and described Vprog contact is obtained by pressure control resistance Rvprog and the first resistance R27 dividing potential drop; Operational amplifier U4C makes current constant control, and described Iprog contact is connected on its reverse input end, and this point is the sampled point of output current V+; Operational amplifier U4D output connects photoelectrical coupler U2A, controls its size of current.The utility model has the advantage of: charging voltage and charging current can calculate voltage-programming resistance Rvprog resistance and voltage-programming resistance Riprog resistance by respective formula as required.The utility model flexible adjustment is accurate, and the scope of application is extensive, both can charging mobile phone, also can fill portable power source and other lithium polymer battery or lead acid accumulator etc.
Description
Technical field
The utility model relates to electronic technology, particularly relates to voltage-stabilized power supply circuit, particularly charger.
Background technology
In prior art, the charging power source circuit of secondary carried out AC-DC conversion before this, and then carry out DC-DC conversion, its conversion efficiency is low: even if the conversion efficiency of every one-level all reaches 85%, finally total efficiency also only has 72.3%, and the electronic component that the charging power source circuit of secondary uses is many, cost is high.
Further, the charger of traditional band band switch regulation output voltage only can only regulate charging voltage, and shelves limited bits, and can not regulate charging current, the scope of application is greatly limited.
All drawbacks are that people want to solve and open question above, and even to this day, the technology of having no has breakthrough.
Utility model content
The purpose of this utility model is the charger providing a kind of non-essential resistance programming regulation and control charging voltage and electric current for the deficiencies in the prior art.The design that the utility model charger unites two into one, compared with existing secondary charger technologies, the charger efficiency united two into one at least reaches more than 85%, and conversion efficiency is high, and cost is low, steplessly can also arrange voltage value and charging current, greatly facilitate application.
The utility model is by realizing by the following technical solutions.
Manufacture and design the charger of a kind of non-essential resistance programming regulation and control charging voltage and electric current, described charger comprises:
Draw Vref contact, Vprog contact, the Iprog contact at charger external;
Described Vref contact is at switched power output V+ place's extraction one voltage-stabilizing device U3, makes voltage-stabilizing device U3 externally export a burning voltage Vref;
Operational amplifier U4D, makes Isobarically Control, and described Vprog contact is obtained by pressure control resistance Rvprog and the first resistance R27 dividing potential drop, and it is voltage reference that operational amplifier U4D inputs termination VProg in the same way;
Another termination Vref of pressure control resistance Rvprog; Operational amplifier U4D reverse input end meets the tie point Ilimit of the second resistance R23 and the 3rd resistance R22, and this point is the sampled voltage point of output voltage V+;
Operational amplifier U4C makes current constant control, and described Iprog contact is connected on its reverse input end, and this point is the sampled point of output current V+; Obtained by the dividing potential drop of flow control resistance Riprog and the 4th resistance R28, the total resistance of the 5th resistance R29; The input in the same way of operational amplifier U4C is connected on one end of current sense resistance R17.
Operational amplifier U4D output connects photoelectrical coupler U2A, controls the size of current of photoelectrical coupler U2A.
Described Rvprog and the first resistance R27 determines the voltage value of output V+;
For Rvprog=(647.38/V+)-10
Unit: K Ω.
Described Riprog and the 4th resistance R28, the 5th resistance R29 determine the size of current of output V+;
For Riprog=(5739/Io)-0.23
Unit: K Ω.
The output termination U4D reverse input end of described operational amplifier U4C.
Compared with prior art, the charger of non-essential resistance programming regulation and control charging voltage of the present utility model and electric current, charging voltage and charging current can press respective formula flexible as required, as long as the charging voltage needed and charging current are substituted into corresponding formula, voltage-programming resistance R vprog resistance and voltage-programming resistance Riprog resistance just can be calculated.
The utility model use is extensive, both can charging mobile phone, also can fill portable power source and other lithium polymer battery or lead acid accumulator etc.
Accompanying drawing explanation
Utilize accompanying drawing to be further detailed the utility model below, but the embodiment in accompanying drawing is not formed any restriction of the present utility model.
Fig. 1 is the principle schematic of the charger of the utility model non-essential resistance programming regulation and control charging voltage and electric current;
Fig. 2 is the flow chart of the utility model non-essential resistance programming regulation and control charging voltage and current methods.
Embodiment
Below in conjunction with concrete execution mode, the utility model is described.
As shown in Figure 1 and Figure 2, manufacture and design the charger of a kind of non-essential resistance programming regulation and control charging voltage and electric current, described charger comprises:
Draw Vref contact, Vprog contact, the Iprog contact at charger external;
Described Vref contact is at switched power output V+ place's extraction one voltage-stabilizing device U3, makes voltage-stabilizing device U3 externally export a burning voltage Vref;
Operational amplifier U4D, makes Isobarically Control, and described Vprog contact is obtained by pressure control resistance Rvprog and the first resistance R27 dividing potential drop, and it is voltage reference that operational amplifier U4D inputs termination VProg in the same way;
Another termination Vref of pressure control resistance Rvprog; Operational amplifier U4D reverse input end meets the tie point Ilimit of the second resistance R23 and the 3rd resistance R22, and this point is the sampled voltage point of output voltage V+;
Operational amplifier U4C makes current constant control, and described Iprog contact is connected on its reverse input end, and this point is the sampled point of output current V+; Obtained by the dividing potential drop of flow control resistance Riprog and the 4th resistance R28, the total resistance of the 5th resistance R29; The input in the same way of operational amplifier U4C is connected on one end of current sense resistance R17.
Operational amplifier U4D output connects photoelectrical coupler U2A, controls the size of current of photoelectrical coupler U2A.
Described Rvprog and the first resistance R27 determines the voltage value of output V+;
For Rvprog=(647.38/V+)-10
Unit: K Ω.
Described Riprog and the 4th resistance R28, the 5th resistance R29 determine the size of current of output V+;
For Riprog=(5739/Io)-0.23
Unit: K Ω.
The output termination U4D reverse input end of described operational amplifier U4C.
Operation principle of the present utility model is as follows:
See figures.1.and.2, secondary feedback, mainly through photoelectrical coupler U2, is controlled electric current and is transported to elementary PWM integrated circuit U1 by the utility model, the operating frequency of integrated circuit U1 and duty ratio is changed and realizes regulation output voltage.
As shown in Figure 1, switched power output V+ carries out linear voltage decreasing by resistance R16 to voltage-stabilizing device U3, and due to R and K of U3 is held short circuit, just obtain the reference voltage V ref of 2.495V, this reference voltage V ref draws out and does reference point by the utility model.
Constant voltage principle:
Operational amplifier U4D does voltage comparator, is used to do Isobarically Control, pin 13 backward end does sampling charging voltage, and this level point is: Vo R22/(R22+R23);
Be 49.9K when R22 is 2K, R23, this level point is: Vo 2/(2+49.9)=0.03854 Vo;
Pin 12 is held in the same way as reference point, this reference point level is: Vref R vprog/(R vprog+R27), wherein Vref is that 2.495V, R27 are fixed as 10K, obtains reference point level and is: 2.495 R vprog/(R vprog+10):
0.03854 V0=: 2.495 R vprog/(R vprog+10), abbreviation becomes: R vprog=(647.38/V0) – 10 (unit: K, kilohm).
When the charging voltage of output reaches and higher than set point, comparator U4D pin 13 backward end level holds level in the same way higher than equaling pin 12, that is:
Comparator U4D 14 upset becomes low level, and photoelectrical coupler U2A flows through electric current and increases, and feeds back to primary integrated circuit U1, and reduce duty ratio, output voltage is declined, and closed-loop control reaches the constant of output voltage.
Constant current principle:
Operational amplifier U4C, does current constant control as comparator, and pin 10 is held in the same way and done sampling charging current, and this level point is: Io R17, and when R17 is 0.1 ohm, i.e. 0.0001K, this level point is: Io 0.0001=0.0001 Io.
Pin 9 backward end is as reference point, this reference point level is: Vref (R28+R29)/(R iprog+R28+R29), wherein Vref is 2.495V, R28 is 30 ohm, R28 is 200 ohm, obtains reference point level to be: 2.495 0.23/(R vprog+0.23).Namely
0.57385 = 0.000023 ? Io +0.0001 ? Io ? Riprog 。
Abbreviation becomes: R iprog=(5739/ Io) – 0.23; (unit: K, kilohm).
When the charging current of output reaches and higher than set point, comparator U4C pin 10 holds level higher than equaling pin 9 backward end level in the same way, the upset of comparator U4C pin 8 becomes high level, high level signal I limit signal is added to U4D pin 13, U4D pin 13 is again do sampling charging voltage, so high level signal I limit signal is added to U4D pin 13, equivalence becomes output voltage to exceed setting threshold, make comparator U4D pin 14 overturn equally and become low level, photoelectrical coupler U2 flows through electric current and increases, when feeding back to elementary PWM integrated circuit U1, reduce duty ratio, output voltage is declined, closed-loop control reaches the constant of output current.
Turn lamp to control:
Operational amplifier U4B is used as control LED to turn lamp, realizes turning lamp according to charging current.By parameter shown in Fig. 1, fast red switch is full of the electric current namely turning green GREEN lamp by red RED lamp and is approximately about 13% of constant current.
Above content is only preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (5)
1. regulate and control a charger for charging voltage and electric current with non-essential resistance programming, it is characterized in that, described charger comprises:
Draw Vref contact, Vprog contact, the Iprog contact at charger external;
Described Vref contact is at switched power output V+ place's extraction one voltage-stabilizing device U3, makes voltage-stabilizing device U3 externally export a burning voltage Vref;
Operational amplifier U4D, makes Isobarically Control, and described Vprog contact is obtained by pressure control resistance Rvprog and the first resistance R27 dividing potential drop, and it is voltage reference that operational amplifier U4D inputs termination VProg in the same way;
Another termination Vref of pressure control resistance Rvprog; Operational amplifier U4D reverse input end meets the tie point Ilimit of the second resistance R23 and the 3rd resistance R22, and this point is the sampled voltage point of output voltage V+;
Operational amplifier U4C makes current constant control, and described Iprog contact is connected on its reverse input end, and this point is the sampled point of output current V+; Obtained by the dividing potential drop of flow control resistance Riprog and the 4th resistance R28, the total resistance of the 5th resistance R29; The input in the same way of operational amplifier U4C is connected on one end of current sense resistance R17.
2. the charger of non-essential resistance programming regulation and control charging voltage according to claim 1 and electric current, it is characterized in that, operational amplifier U4D output connects photoelectrical coupler U2A, controls the size of current of photoelectrical coupler U2A.
3. the charger of non-essential resistance programming regulation and control charging voltage according to claim 1 and electric current, it is characterized in that, described Rvprog and the first resistance R27 determines the voltage value of output V+;
For Rvprog=(647.38/V+)-10
Unit: K Ω.
4. the charger of non-essential resistance programming regulation and control charging voltage according to claim 1 and electric current, it is characterized in that, described Riprog and the 4th resistance R28, the 5th resistance R29 determine the size of current of output V+;
For Riprog=(5739/Io)-0.23
Unit: K Ω.
5. the charger of non-essential resistance programming regulation and control charging voltage according to claim 1 and electric current, is characterized in that, the output termination U4D reverse input end of described operational amplifier U4C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520121204.0U CN204441986U (en) | 2015-03-02 | 2015-03-02 | The charger of charging voltage and electric current is regulated and controled with non-essential resistance programming |
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| CN201520121204.0U CN204441986U (en) | 2015-03-02 | 2015-03-02 | The charger of charging voltage and electric current is regulated and controled with non-essential resistance programming |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600823A (en) * | 2015-03-02 | 2015-05-06 | 东莞市石龙富华电子有限公司 | Method and charger of controlling charging voltage and current through external resistance programming |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600823A (en) * | 2015-03-02 | 2015-05-06 | 东莞市石龙富华电子有限公司 | Method and charger of controlling charging voltage and current through external resistance programming |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Charger using external resistor programming to regulate charging voltage and current Effective date of registration: 20191125 Granted publication date: 20150701 Pledgee: China Co. truction Bank Corp Dongguan branch Pledgor: FUHUA ELECTRONIC Co.,Ltd. Registration number: Y2019440000232 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220824 Granted publication date: 20150701 Pledgee: China Co. truction Bank Corp Dongguan branch Pledgor: FUHUA ELECTRONIC Co.,Ltd. Registration number: Y2019440000232 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Charger with external resistor programming to regulate charging voltage and current Effective date of registration: 20220830 Granted publication date: 20150701 Pledgee: China Co. truction Bank Corp Dongguan branch Pledgor: FUHUA ELECTRONIC Co.,Ltd. Registration number: Y2022980014007 |