CN205070823U - Former limit feedback -type power module of high accuracy - Google Patents
Former limit feedback -type power module of high accuracy Download PDFInfo
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- CN205070823U CN205070823U CN201520525490.7U CN201520525490U CN205070823U CN 205070823 U CN205070823 U CN 205070823U CN 201520525490 U CN201520525490 U CN 201520525490U CN 205070823 U CN205070823 U CN 205070823U
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Abstract
The utility model discloses a former limit feedback -type power module of high accuracy, including power supply chip U11, power supply chip U11's COMP foot is connected with electric capacity C11's one end, electric capacity C11's other end ground connection, power supply chip U11's INV foot still is connected with divider resistance R1's one end and divider resistance R2's one end respectively, divider resistance R1's the other end is connected with auxiliary voltage VAUX, divider resistance R2's other end ground connection, sampling resistor rs's one end is connected to power supply chip U11's CS foot, sampling resistor rs's other end ground connection, power supply chip U11's GND foot ground connection, power supply chip U11's DRAIN foot output voltage. Former limit feedback -type power module of high accuracy only needs little peripheral resistor -Capacitor units go to the ripe reverse side of control to swash formula power circuit, can realize high performance, low cost, able to programme, high power density's very practical cell -phone charging source.
Description
Technical field
The utility model relates to a kind of power circuit, refers in particular to a kind of high accuracy former limit feedback-type power module and control method thereof.
Background technology
On market, the existing digital product such as mobile phone, the camera charge power supply scheme that is applicable to is a lot, is roughly divided into two large classes: constant-pressure type and constant current voltage limiting type.Constant-pressure type scheme mainly contains power frequency step-down rectifier filters solutions, RCC(single tube ringing choke circle converter) scheme and optocoupler add a reference source secondary side feedback scheme etc.Constant current voltage limiting type scheme mainly contains optocoupler, a reference source adds comparator/and amplifier scheme and optocoupler, comparator add MCU(microprocessor) scheme.Although constant-pressure type scenario-frame is simple, Technical comparing is ripe, and components and parts used are less, but there is fatal shortcoming: constant-pressure type charge power supply is when cell voltage is lower, and charging current is very large, and this is serious on battery life impact; Constant current voltage limiting type charge power supply compares the charging requirement meeting battery, but cost is higher, and the market competitiveness is poor.
China Patent Publication No. CN203218953U, publication date on September 25th, 2013, name is called in the utility model patent of " a kind of variable constant current pressure limiting charger " and discloses a kind of variable constant current pressure limiting charger, it has set up input power testing circuit and reference electric current conversion module on the basis of existing constant current voltage limiting charger, detect the power of input power by input power testing circuit and be sent to reference electric current conversion module, by reference electric current conversion module according to the charge power/electric current conversion scale preset, the reference current signal of corresponding proportion is obtained according to the power conversion of input power, the benchmark input end of current error comparator then connects the reference current signal of reference electric current conversion mould output.This charger can significantly reduce the energy waste caused because input power power is non-constant, solves the problem that the application of constant current voltage limiting charger in the inconstant working power of power output is limited.It is higher that weak point is that this charger still exists cost, the problem that competitiveness is poor.
Utility model content
The purpose of this utility model is that to overcome constant-pressure type charge power supply in prior art shorter for useful life, the defect that constant current voltage limiting type charge power supply cost is higher, provides a kind of useful life longer, lower-cost high accuracy former limit feedback-type power module.
The purpose of this utility model is achieved by following technical proposals:
A kind of high accuracy former limit feedback-type power module, comprise power supply chip U11, the VDD pin of power supply chip U11 is connected with one end of starting resistance R11, the other end of starting resistance R11 is connected with high direct voltage VDC, starting resistance VDD is also connected with the negative electrode of diode D12, the anode of diode D12 is connected with boost voltage VAUX, the COMP pin of power supply chip U11 is connected with one end of electric capacity C11, the other end ground connection of electric capacity C11, the INV pin of power supply chip U11 is also connected with one end of divider resistance R2 with one end of divider resistance R1 respectively, the other end of divider resistance R1 is connected with boost voltage VAUX, the other end ground connection of divider resistance R2, the CS pin of power supply chip U11 connects one end of sampling resistor Rs, the other end ground connection of sampling resistor Rs, the GND pin ground connection of power supply chip U11, the DRAIN pin output voltage of power supply chip U11, the negative electrode of diode D12 also connects the positive pole of electrochemical capacitor CD11, the minus earth of electrochemical capacitor CD11, auxiliary winding NAUX is also provided with between boost voltage VAUX and ground connection.
There is following relation in boost voltage and output voltage:
，
N in formula
srepresent secondary umber of turn, V
orepresent output voltage, △ V represents output rectifier diode forward voltage drop.
The VDD pin of power supply chip U11 receives high direct voltage for starting power supply chip U11, the INV pin of power supply chip U11 is for detecting the voltage of boost voltage VAUX, divider resistance R1 and divider resistance R2 is used for carrying out dividing potential drop to boost voltage VAUX, when the INV pin voltage of power supply chip U11 is lower than set point, charge power supply is operated in constant current mode, when the INV pin voltage of power supply chip U11 is greater than or equal to set point, charge power supply is operated in constant voltage mode, and the DRAIN pin of power supply chip U11 is used for output voltage.Whole circuit only needs little peripheral Resistor-Capacitor Unit, removes the flyback power circuit of contral ripening, can realize the very practical mobile phone charge power supply of high-performance, low cost, able to programme, high power density.
As a kind of preferred version, power supply chip U11 is LSD2DC-7501 power supply chip.
This power supply chip mainly comprises following components:
1) built-in metal-oxide-semiconductor (mos field effect transistor) and drive circuit thereof;
2) pulse-width modulation and logic control circuit;
3) feed regulator isolator, internal reference source and protective circuit thereof;
4) voltage sample, error are amplified and compensating circuit;
5) current sample and edge blanking circuit;
6) protective circuits such as overcurrent protection, overheat protector and overvoltage protection.
A control method for high accuracy former limit feedback-type power module, comprises the following steps:
Step 1, power supply chip U11 starts;
Step 2, detects the INV pin voltage of power supply chip U11, if when INV pin voltage is lower than the magnitude of voltage set, power module is operated in constant current mode, if when INV pin voltage is greater than or equal to the magnitude of voltage set, power module is operated in constant voltage mode;
Step 3, by the resistance of adjustment divider resistance R1, carries out voltage-drop compensation to output voltage.After considering cable pressure drop, there is following relation in boost voltage and output voltage:
，
In formula, Vcable represents cable pressure drop.The offset voltage that power supply chip U11 internal current source Ic flows to divider resistance R2 generation can make up cable pressure drop, and electric current I c is inversely proportional to output voltage error amplifier, is also namely inversely proportional to charge power supply output current, and the pressure drop that thus line loss causes is compensated.After considering internal current source Ic, following relation can be obtained:
，
In formula, Vref is chip internal a reference source voltage, and also namely stable state is the voltage of INV pin.
By the resistance of adjustment divider resistance R1, cable pressure drop can be compensated easily, contribute to the accuracy ensureing output voltage within the scope of total power, current regulation excellent under also namely achieving constant voltage mode.
As a kind of preferred version; step 1 is specially the high direct voltage VDC after exchanging input rectifying and is charged to VDD shunt capacitance D12 by starting resistance R11; once VDD exceedes under-voltage protection point; namely power supply chip U11 starts soft start; after the built-in MOS startup of power supply chip U11, output voltage starts to rise, and boost voltage VAUX is along with rising; until boost voltage VAUX ultra under-pressure protection point, start-up course terminates.
As a kind of preferred version, if when step 2 is specially INV pin voltage lower than the magnitude of voltage set, power module is operated in constant current mode, and when secondary output current reaches Internal current limit circuit set point, power supply chip U11 enters limited current state, thus output voltage declines, and then boost voltage VAUX also declines, now, the internal shunt the regulation of electrical circuit switching frequency of boost voltage VAUX, to make power output be proportional to output voltage, achieve constant secondary output current; Resistance R1 and R2 carries out dividing potential drop to boost voltage, the sampled voltage that INV pin obtains follows a reference source of chip internal to compare as the input of error amplifier, the output of error amplifier controls the duty ratio of built-in metal-oxide-semiconductor conducting, thus adjustment output voltage, reach the object that constant voltage exports; If when INV pin voltage is greater than or equal to the magnitude of voltage set, power module is operated in constant voltage mode divider resistance R1 and divider resistance R2 carries out dividing potential drop to boost voltage VAUX, the sampled voltage that the INV pin of power supply chip obtains follows a reference source of chip internal to compare as the input of error amplifier, the output of error amplifier controls the duty ratio of built-in metal-oxide-semiconductor conducting, thus adjustment output voltage, reach the object that constant voltage exports.
The beneficial effects of the utility model are, high accuracy former limit feedback-type power module only needs little peripheral Resistor-Capacitor Unit to remove the flyback power circuit of contral ripening, can realize the very practical mobile phone charge power supply of high-performance, low cost, able to programme, high power density.Be applicable to produce in enormous quantities, have received good economic benefit.
Accompanying drawing explanation
Fig. 1 is a kind of circuit diagram of the present utility model;
Fig. 2 is chip internal current source Ic control circuit figure of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described.
Embodiment: a kind of high accuracy former limit feedback-type power module, its circuit diagram as shown in Figure 1, comprise power supply chip U11, the VDD pin of power supply chip U11 is connected with one end of starting resistance R11, the other end of starting resistance R11 is connected with high direct voltage VDC, starting resistance VDD is also connected with the negative electrode of diode D12, the anode of diode D12 is connected with boost voltage VAUX, the COMP pin of power supply chip U11 is connected with one end of electric capacity C11, the other end ground connection of electric capacity C11, the INV pin of power supply chip U11 is also connected with one end of divider resistance R2 with one end of divider resistance R1 respectively, the other end of divider resistance R1 is connected with boost voltage VAUX, the other end ground connection of divider resistance R2, the CS pin of power supply chip U11 connects one end of sampling resistor Rs, the other end ground connection of sampling resistor Rs, the GND pin ground connection of power supply chip U11, the DRAIN pin output voltage of power supply chip U11, the negative electrode of diode D12 also connects the positive pole of electrochemical capacitor CD11, the minus earth of electrochemical capacitor CD11, auxiliary winding NAUX is also provided with between boost voltage VAUX and ground connection.
Power supply chip U11 is LSD2DC-7501 power supply chip.This power supply chip mainly comprises following components:
1) built-in metal-oxide-semiconductor (mos field effect transistor) and drive circuit thereof;
2) pulse-width modulation and logic control circuit;
3) feed regulator isolator, internal reference source and protective circuit thereof;
4) voltage sample, error are amplified and compensating circuit;
5) current sample and edge blanking circuit;
6) protective circuits such as overcurrent protection, overheat protector and overvoltage protection.
A control method for high accuracy former limit feedback-type power module, comprises the following steps:
Step 1, power supply chip U11 starts: the high direct voltage VDC exchanged after input rectifying is charged to VDD shunt capacitance D12 by starting resistance R11, once VDD exceedes under-voltage protection point, namely power supply chip U11 starts soft start, after the built-in MOS startup of power supply chip U11, output voltage starts to rise, and boost voltage VAUX is along with rising, until boost voltage VAUX ultra under-pressure protection point, start-up course terminates;
Step 2, detects the INV pin voltage of power supply chip U11, if during the magnitude of voltage of INV pin voltage lower than setting 2.0V, power module is operated in constant current mode, if during the magnitude of voltage of INV pin voltage greater than or equal to setting 2.V, power module is operated in constant voltage mode.If when being specially INV pin voltage lower than the magnitude of voltage set, power module is operated in constant current mode, when secondary output current reaches Internal current limit circuit set point, power supply chip U11 enters limited current state, thus output voltage declines, and then boost voltage VAUX also declines, now, the internal shunt the regulation of electrical circuit switching frequency of boost voltage VAUX, to make power output be proportional to output voltage, achieves constant secondary output current; Resistance R1 and R2 carries out dividing potential drop to boost voltage, the sampled voltage that INV pin obtains follows a reference source of chip internal to compare as the input of error amplifier, the output of error amplifier controls the duty ratio of built-in metal-oxide-semiconductor conducting, thus adjustment output voltage, reach the object that constant voltage exports; If when INV pin voltage is greater than or equal to the magnitude of voltage set, power module is operated in constant voltage mode divider resistance R1 and divider resistance R2 carries out dividing potential drop to boost voltage VAUX, the sampled voltage that the INV pin of power supply chip obtains follows a reference source of chip internal to compare as the input of error amplifier, the output of error amplifier controls the duty ratio of built-in metal-oxide-semiconductor conducting, thus adjustment output voltage, reach the object that constant voltage exports.；
Step 3, by the resistance of adjustment divider resistance R1, carries out voltage-drop compensation to output voltage.After considering cable pressure drop, there is following relation in boost voltage and output voltage:
，
In formula, Vcable represents cable pressure drop.The offset voltage that power supply chip U11 internal current source Ic flows to divider resistance R2 generation can make up cable pressure drop, and electric current I c is inversely proportional to output voltage error amplifier, is also namely inversely proportional to charge power supply output current, and the pressure drop that thus line loss causes is compensated.After considering internal current source Ic, following relation can be obtained:
，
In formula, Vref is chip internal a reference source voltage, and also namely stable state is the voltage of INV pin.
By the resistance of adjustment divider resistance R1, cable pressure drop can be compensated easily, contribute to the accuracy ensureing output voltage within the scope of total power, current regulation excellent under also namely achieving constant voltage mode.
Claims (1)
1. a high accuracy former limit feedback-type power module, it is characterized in that, comprise power supply chip U11, the VDD pin of power supply chip U11 is connected with one end of starting resistance R11, the other end of starting resistance R11 is connected with high direct voltage VDC, starting resistance VDD is also connected with the negative electrode of diode D12, the anode of diode D12 is connected with boost voltage VAUX, the COMP pin of power supply chip U11 is connected with one end of electric capacity C11, the other end ground connection of electric capacity C11, the INV pin of power supply chip U11 is also connected with one end of divider resistance R2 with one end of divider resistance R1 respectively, the other end of divider resistance R1 is connected with boost voltage VAUX, the other end ground connection of divider resistance R2, the CS pin of power supply chip U11 connects one end of sampling resistor Rs, the other end ground connection of sampling resistor Rs, the GND pin ground connection of power supply chip U11, the DRAIN pin output voltage of power supply chip U11, the negative electrode of diode D12 also connects the positive pole of electrochemical capacitor CD11, the minus earth of electrochemical capacitor CD11, auxiliary winding NAUX is also provided with between boost voltage VAUX and ground connection, power supply chip U11 is LSD2DC-7501 power supply chip.
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| CN201520525490.7U CN205070823U (en) | 2015-07-20 | 2015-07-20 | Former limit feedback -type power module of high accuracy |
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| CN201520525490.7U CN205070823U (en) | 2015-07-20 | 2015-07-20 | Former limit feedback -type power module of high accuracy |
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| CN205070823U true CN205070823U (en) | 2016-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281588A (en) * | 2015-07-20 | 2016-01-27 | 浙江利尔达物联网技术有限公司 | High-precision primary side feedback-type power supply module and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281588A (en) * | 2015-07-20 | 2016-01-27 | 浙江利尔达物联网技术有限公司 | High-precision primary side feedback-type power supply module and control method thereof |
| CN105281588B (en) * | 2015-07-20 | 2018-06-05 | 浙江利尔达物联网技术有限公司 | A kind of high-precision primary side feedback type power module and its control method |
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| TR01 | Transfer of patent right |
Effective date of registration: 20191209 Address after: Room 1502, building 1, no.1326, Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Xixian Technology Co. Ltd. Address before: Yuhang District, Hangzhou City, Zhejiang Province, 310000 West No. 1500 Building No. 1 room 105 Patentee before: ZHEJIANG LIERDA INTERNET OF THINGS TECHNOLOGY CO., LTD. |