CN107070219A - A kind of switching power circuit of five grades of optional 3A outputs - Google Patents
A kind of switching power circuit of five grades of optional 3A outputs Download PDFInfo
- Publication number
- CN107070219A CN107070219A CN201710399756.1A CN201710399756A CN107070219A CN 107070219 A CN107070219 A CN 107070219A CN 201710399756 A CN201710399756 A CN 201710399756A CN 107070219 A CN107070219 A CN 107070219A
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- Prior art keywords
- module
- voltage
- inductance
- power circuit
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
Abstract
The present invention relates to the switching power circuit of a kind of five grades optional 3A outputs, including voltage changing module, rectification module, capacitor filtering module, Voltage stabilizing module, control module, module of transferring the files and LC filtration modules；The electric current after rectification module rectification is filtered by the filter capacitor for choosing different capacitances, by different electric capacity in parallel, the certain voltage ripple of single pair of is not filtered, while some small capacitances in parallel remove some big burr ripples.And it can carry out choosing the output current of different voltages by step-down switching type integrated voltage-stabilized chip and module of transferring the files, when meeting charging, different electrical equipment are to different voltage requirements.
Description
Technical field
The present invention relates to a kind of field of switch power, the switching power circuit of more particularly to a kind of five grades of optional 3A outputs.
Background technology
Switching Power Supply has two kinds：One kind is direct-current switch power supply；Another is alternating-current switch power supply.Direct-current switch power supply,
It is that such as mains supply or battery feed are converted into meeting equipment requirement by the poor ecosystem power supply of the quality of power supply (thick electricity)
The higher DC voltage of quality (essence electricity).Larger ripple can be superimposed above the direct current of Switching Power Supply output, ripple is due to
The voltage pulsation of DC stable power supply and a kind of phenomenon caused, because DC stable power supply is usually rectified by AC power
Formed by the links such as voltage stabilizing, how much this just inevitably carries some Alternating Components, this superposition in DC stabilization amount
AC compounent in DC stabilization amount is just referred to as ripple.And if can only be to certain electricity to certain filter capacitor is chosen
Embossing ripple works, and due to the factor influence such as transformer and circuit interference, can also there is some other ripples.And ripple
Influence so that the electric current of circuit output is not pure enough.
The content of the invention
For this reason, it may be necessary to provide a kind of five grades for can providing output net current and the different voltages of gear selecting output being realized
The switching power circuit of optional 3A outputs.
To achieve the above object, the switching power circuit of a kind of five grades optional 3A outputs, including transformation are inventor provided
Module, rectification module, capacitor filtering module, Voltage stabilizing module, control module, module of transferring the files and LC filtration modules；
The voltage changing module includes transformer, the primary two ends connection AC power of the transformer；
The rectification module includes rectifier bridge, and the ac input end of the rectifier bridge connects the secondary of transformer, described whole
The positive pole for flowing the DC output end of bridge is connected to Voltage stabilizing module；
The capacitor filtering module includes the in parallel and filtering between the DC output end positive pole and negative pole of rectifier bridge respectively
Electric capacity C1-C5；
The control module includes microcontroller；
The Voltage stabilizing module includes step-down switching type integrated voltage-stabilized chip, triode Q1, the first inductance L1 and the pole of afterflow two
Pipe D5, the input of the step-down switching type integrated voltage-stabilized chip is connected to the positive pole of rectifier bridge DC output end, the decompression
The output end of switching mode integrated voltage-stabilized chip connects the first inductance L1 one end, the step-down switching type integrated voltage-stabilized chip it is anti-
Feedback end is connected to the first inductance L1 other end, the Enable Pin connecting triode Q1's of the step-down switching type integrated voltage-stabilized chip
Colelctor electrode, the base stage of the triode Q1 is connected to the control I/O pin of microcontroller, the grounded emitter of the triode Q1；
The module of transferring the files includes resistance R21 and adjustable resistance R22, and one end of the resistance R21 is connected to the first inductance
The L1 other end, one end of the resistance R21 is connected to adjustable resistance R22 one end, and the adjustable end of the adjustable resistance R22 connects
It is connected to the first inductance L1 other end, the other end ground connection of the adjustable resistance R22；
The LC filtration modules include the second inductance L2, filter capacitor C7 and filter capacitor C8, the second inductance L2's
One end is connected to the first inductance L1 other end, and one end of the second inductance L2 is grounded by filter capacitor C7, and described second
The inductance L2 other end is grounded by filter capacitor C8.
Further optimization, the step-down switching type integrated voltage-stabilized chip is LM2576HV-ADJ step-down switching type integrated voltage-stabilizeds
Chip.
Further optimization, the capacitance of the filter capacitor C1-C5 is respectively 470 μ F, 470 μ F, 47 μ F, 10 μ F, 0.1 μ
F。
Further optimization, is provided with fuse between the transformer and rectifier bridge.
Further optimization, the other end of the first inductance L1 is grounded by filter capacitor C6, the filter capacitor C6's
Capacitance is 1000 μ F.
Further optimization, the magnetic conductivity of the second inductance L2 is 100mH, filter capacitor C7 and filter capacitor C8 electric capacity
It is worth for 2200 μ F.
Further optimization, in addition to temperature sensor, the temperature sensor is connected to microcontroller, the TEMP
Device is used for the temperature of detection switch power circuit, and the temperature information detected is sent to microcontroller.
Further optimization, in addition to radiator fan, the control end of the radiator fan is connected to microcontroller, the radiating
Fan is used to give Switching Power Supply radiating.
Further optimization, it is too high that the microcontroller is additionally operable to temperature sensor detection temperature, controls step-down switching type collection
Stop output voltage into voltage stabilizing chip.
Further optimization, in addition to controller power supply module, the controller power supply module is used to power to microcontroller,
The controller power supply module includes voltage stabilizing chip LM2576-5, the voltage stabilizing chip LM2576-5 input connection rectification mould
The DC output end of block, the output end connection microcontroller of the voltage stabilizing chip LM2576-5.
Prior art is different from, above-mentioned technical proposal is by choosing the filter capacitor of different capacitances to passing through rectification module
Electric current after rectification is filtered, by different electric capacity in parallel, and the certain voltage ripple of single pair of is not filtered, while in parallel
Some small capacitances remove some big burr ripples.And it can be entered by step-down switching type integrated voltage-stabilized chip and module of transferring the files
Row chooses the output current of different voltages, and when meeting charging, different electrical equipment are to different voltage requirements.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the switching power circuit of five grades of optional 3A outputs described in embodiment；
Fig. 2 is a kind of circuit theory diagrams of the switching power circuit of five grades of optional 3A outputs described in embodiment.
Description of reference numerals：
110th, voltage changing module,
120th, rectification module,
130th, capacitor filtering module,
140th, Voltage stabilizing module,
150th, control module,
160th, transfer the files module,
170th, LC filtration modules,
180th, temperature sensor.
Embodiment
To describe the technology contents of technical scheme in detail, feature, the objects and the effects being constructed, below in conjunction with specific reality
Apply example and coordinate accompanying drawing to be explained in detail.
Refer to Fig. 1 and Fig. 2, the switching power circuit of the optional 3A outputs of a kind of five grades of the present embodiment, including voltage changing module
110th, rectification module 120, capacitor filtering module 130, Voltage stabilizing module 140, control module 150, module of transferring the files 160 and LC filtering moulds
Block 170；
The voltage changing module 110 includes transformer, the primary two ends connection AC power of the transformer；Pass through transformer
The 220V of input alternating current is just pressed onto 36V.
The rectification module 120 includes rectifier bridge, and the ac input end of the rectifier bridge connects the secondary of transformer, described
The positive pole of the DC output end of rectifier bridge is connected to Voltage stabilizing module 140；By rectification module 120, to the 36V alternating currents after transformation
Rectification is carried out, is that the alternating current of output is rectified rear for direct current.
The capacitor filtering module 130 includes the in parallel and filter between the DC output end positive pole and negative pole of rectifier bridge respectively
Ripple electric capacity C1-C5；According to the diode current flow time of rectifier bridge, the angle of flow, input voltage Vindc, ripple voltage factor alpha, voltage
Frequency fac, the parameter such as power P and power factor (PF) derive the input of step-down switching type integrated voltage-stabilized chip in Voltage stabilizing module 140
Input capacitance Cin, such as formula：
By the way that the ripple system after rectification is less than into 8%, the ac frequency of input is 45-55Hz and voltage is 185-255V
Between, to make the corona of Switching Power Supply wider using face, power is then 220W by high-power consideration of the input for 1A, and is considered
Big voltage pulsation, then be 300W；Then calculated by formula and obtain input capacitance for 976 μ F, and because electric capacity has error, therefore take
The 80% of scale value.Because input filter capacitor size is inversely proportional with rectifying and wave-filtering ripple voltage, certain filtering have chosen
Electric capacity can only work to certain ripple voltage, so because the factor influence such as transformer and circuit interference, can also have it
Its some ripple.Therefore except considering capacitance Cin, in addition it is also necessary to some small capacitances in parallel remove some big burr ripples, so input
Filter capacitor C1-C5 capacitance is respectively：470μF、470μF、47μF、10μF、0.1μF.
The control module 150 includes microcontroller；Also include controller power supply module, the controller power supply module is used
Powered in microcontroller, the controller power supply module includes voltage stabilizing chip LM2576-5, the voltage stabilizing chip LM2576-5
Input connect rectification module 120 DC output end, the voltage stabilizing chip LM2576-5 output end connection microcontroller.
Microcontroller is single-chip microcomputer, and the operating voltage requirements of single-chip microcomputer are 5V, pass through voltage stabilizing chip LM2576- in controller power supply module
5 by there is provided the need of work of microcontroller after the voltage progress lowering and stabilizing blood pressure processing after rectification.
The bag step-down switching type integrated voltage-stabilized chip of Voltage stabilizing module 140, triode Q1, the first inductance L1 and the pole of afterflow two
Pipe D5, the input of the step-down switching type integrated voltage-stabilized chip is connected to the positive pole of rectifier bridge DC output end, the decompression
The output end of switching mode integrated voltage-stabilized chip connects the first inductance L1 one end, and the other end of the first inductance L1 passes through filtering
Electric capacity C6 is grounded, and the feedback end of the step-down switching type integrated voltage-stabilized chip is connected to the first inductance L1 other end, the drop
The Enable Pin connecting triode Q1 of the type that compresses switch integrated voltage-stabilized chip colelctor electrode, the base stage of the triode Q1 is connected to micro-control
The control I/O pin of device processed, the grounded emitter of the triode Q1；Step-down switching type integrated voltage-stabilized chip uses voltage stabilizing chip
LM2576HV-ADJ, voltage stabilizing chip LM2576HV-ADJ are that 3.3V, 5V, 12V, 15V and 24V are optional, pass through voltage stabilizing chip
The voltage that LM2576HV-ADJ can export different magnitudes of voltage carries out meeting requirement of the different electrical equipment to different charging voltages, and
And can have reliable service behaviour, higher operating efficiency and stronger output current driving force.LM2576HV-ADJ
The first inductance L1 selections of output end can be according to its maximum input voltage Vin, output voltage Vout, working oscillation frequency f selects
Select.It is determined with voltage microsecond constant (ET), and formula is ET=(Vin-Vout)*Vout/Vin* 1000/f,
LM2576HV-ADJ working oscillation frequencies are 52kHz, it is assumed that its input voltage is in 3.5-40V, output voltage 1.23-37V.With
VinFor 40V, VoutCalculated for 5V, after ET is determined, selection L1 is 150 μ H.Output filter capacitor CoutCan be according to formula：
Calculate Cout>=709 μ F, therefore C6 capacitance is 1000 μ F in switching power circuit.Sustained diode 5
Load current value should be greater than 1.2 times of maximum load current, it is contemplated that the situation of load short circuits, sustained diode 5 it is specified
Current value should be greater than LM2576HV-ADJ maximum current limitation, choose 1N5822.Because output voltage exports for transformation, being can
Break-make output is controlled, that is, controls LM2576HV-ADJ break-makes, the IO for having microcontroller CPU is controlled.I/O port through triode Q1, then
The Enable Pin of control LM2576HV-ADJ break-makes is inputted through pull-up resistor.
The described one end of module 160 including resistance R21 and adjustable resistance R22, the resistance R21 of transferring the files is connected to the first electricity
Feel the L1 other end, one end of the resistance R21 is connected to adjustable resistance R22 one end, the adjustable end of the adjustable resistance R22
It is connected to the first inductance L1 other end, the other end ground connection of the adjustable resistance R22；According to the charging pair of different voltage class
As adjustable voltage being exported, according to formula：
Wherein reference voltage VREFIt is LM2576HV-ADJ reference voltage 1.23V, it is adjustable according to output 3.3-24V, and R1Take
1K Ω, then design R2, it is computed R2=1.68-18.51K Ω, take nominal value 1.6-22K Ω, therefore resistance R21 resistance is 1K Ω,
Adjustable resistance R22 Standard resistance range is 1.6-22K Ω.
The LC filtration modules 170 include the second inductance L2, filter capacitor C7 and filter capacitor C8, the second inductance L2
One end be connected to the first inductance L1 other end, one end of the second inductance L2 is grounded by filter capacitor C7, described
The two inductance L2 other end is grounded by filter capacitor C8.In order that the ripple system of output is less than 0.5%.According to ripple factor r
=0.47/ filter factor, it can be deduced that filter factor is 94, then by CLC filter factors：130*L*C7*C8*RL/1000000,
By exporting by conventional 5V for based on, maximum output 3A considers, takes L=100mH, makes C7=C8 and take nominal value, then the second inductance
L2 magnetic conductivity is that 100mH, filter capacitor C7 and filter capacitor C8 capacitance are 2200 μ F.
In the present embodiment, in order to protect whole switching power circuit, provided with insurance between the transformer and rectifier bridge
Silk.Carry out protecting using for whole switching power circuit safe by fuse.
In the present embodiment, in addition to temperature sensor 180, the temperature sensor 180 is connected to microcontroller, described
Temperature sensor 180 is used for the temperature of detection switch power circuit, and the temperature information detected is sent to microcontroller.It is logical
Excess temperature sensor 180 is detected to the temperature of Switching Power Supply, and the temperature information detected is sent to microcontroller, micro-
Controller can judge whether the temperature of switching power circuit is too high according to the temperature information detected, when temperature is more than default
During threshold values, then switching power circuit can be radiated by radiator fan, wherein radiator fan is connected to microcontroller.And
When the constant temperature of Switching Power Supply exceedes a period of time, such as 5 minutes, then microprocessor control control step-down switching type is integrated steady
Press chip output voltage.
Although the various embodiments described above are described, those skilled in the art once know basic wound
The property made concept, then can make other change and modification to these embodiments, so embodiments of the invention are the foregoing is only,
Not thereby the scope of patent protection of the present invention, the equivalent structure that every utilization description of the invention and accompanying drawing content are made are limited
Or equivalent flow conversion, or other related technical fields are directly or indirectly used in, similarly it is included in the patent of the present invention
Within protection domain.
Claims (10)
1. a kind of switching power circuit of five grades of optional 3A outputs, it is characterised in that including voltage changing module, rectification module, electric capacity
Filtration module, Voltage stabilizing module, control module, module of transferring the files and LC filtration modules；
The voltage changing module includes transformer, the primary two ends connection AC power of the transformer；
The rectification module includes rectifier bridge, and the ac input end of the rectifier bridge connects the secondary of transformer, the rectifier bridge
The positive pole of DC output end be connected to Voltage stabilizing module；
The capacitor filtering module includes the in parallel and filter capacitor between the DC output end positive pole and negative pole of rectifier bridge respectively
C1-C5；
The control module includes microcontroller；
The Voltage stabilizing module includes step-down switching type integrated voltage-stabilized chip, triode Q1, the first inductance L1 and sustained diode 5,
The input of the step-down switching type integrated voltage-stabilized chip is connected to the positive pole of rectifier bridge DC output end, the step-down switching type
The output end of integrated voltage-stabilized chip connects the first inductance L1 one end, and the feedback end of the step-down switching type integrated voltage-stabilized chip connects
It is connected to the first inductance L1 other end, the Enable Pin connecting triode Q1 of step-down switching type integrated voltage-stabilized chip current collection
Pole, the base stage of the triode Q1 is connected to the control I/O pin of microcontroller, the grounded emitter of the triode Q1；
The described one end of module including resistance R21 and adjustable resistance R22, the resistance R21 of transferring the files is connected to the first inductance L1's
The other end, one end of the resistance R21 is connected to adjustable resistance R22 one end, and the adjustable end of the adjustable resistance R22 is connected to
The first inductance L1 other end, the other end ground connection of the adjustable resistance R22；
The LC filtration modules include the second inductance L2, filter capacitor C7 and filter capacitor C8, one end of the second inductance L2
The the first inductance L1 other end is connected to, one end of the second inductance L2 is grounded by filter capacitor C7, second inductance
The L2 other end is grounded by filter capacitor C8.
2. the switching power circuit that five grades of optional 3A are exported according to claim 1, it is characterised in that the step-down switching type
Integrated voltage-stabilized chip is LM2576HV-ADJ step-down switching type integrated voltage-stabilized chips.
3. the switching power circuit that five grades of optional 3A are exported according to claim 1, it is characterised in that the filter capacitor
C1-C5 capacitance is respectively 470 μ F, 470 μ F, 47 μ F, 10 μ F, 0.1 μ F.
4. the switching power circuit of five grades of optional 3A output according to claim 1, it is characterised in that the transformer and whole
Fuse is provided between stream bridge.
5. the switching power circuit that five grades of optional 3A are exported according to claim 1, it is characterised in that the first inductance L1
The other end be grounded by filter capacitor C6, the capacitance of the filter capacitor C6 is 1000 μ F.
6. the switching power circuit that five grades of optional 3A are exported according to claim 1, it is characterised in that the second inductance L2
Magnetic conductivity be that 100mH, filter capacitor C7 and filter capacitor C8 capacitance is 2200 μ F.
7. the switching power circuit that five grades of optional 3A are exported according to claim 1, it is characterised in that also including TEMP
Device, the temperature sensor is connected to microcontroller, and the temperature sensor is used for the temperature of detection switch power circuit, and will
The temperature information detected is sent to microcontroller.
8. the switching power circuit that five grades of optional 3A are exported according to claim 7, it is characterised in that also including radiation air
Fan, the control end of the radiator fan is connected to microcontroller, and the radiator fan is used to give Switching Power Supply radiating.
9. the switching power circuit that five grades of optional 3A are exported according to claim 7, it is characterised in that the microcontroller is also
Too high for temperature sensor detection temperature, control step-down switching type integrated voltage-stabilized chip stops output voltage.
10. the switching power circuit that five grades of optional 3A are exported according to claim 1, it is characterised in that also including controller
Power supply module, the controller power supply module is used to power to microcontroller, and the controller power supply module includes voltage stabilizing chip
LM2576-5, the voltage stabilizing chip LM2576-5 input connect the DC output end of rectification module, the voltage stabilizing chip
LM2576-5 output end connection microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710399756.1A CN107070219A (en) | 2017-05-31 | 2017-05-31 | A kind of switching power circuit of five grades of optional 3A outputs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710399756.1A CN107070219A (en) | 2017-05-31 | 2017-05-31 | A kind of switching power circuit of five grades of optional 3A outputs |
Publications (1)
| Publication Number | Publication Date |
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| CN107070219A true CN107070219A (en) | 2017-08-18 |
Family
ID=59615356
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710399756.1A Pending CN107070219A (en) | 2017-05-31 | 2017-05-31 | A kind of switching power circuit of five grades of optional 3A outputs |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108462379A (en) * | 2018-03-29 | 2018-08-28 | 云南电网有限责任公司电力科学研究院 | A kind of direct current is double to apply high-voltage great-current experiment power supply ripple suppression circuit |
| CN116827090A (en) * | 2023-08-29 | 2023-09-29 | 深圳市力生美半导体股份有限公司 | Switching power supply circuit and control method |
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| CN116827090B (en) * | 2023-08-29 | 2023-11-10 | 深圳市力生美半导体股份有限公司 | Switching power supply circuit and control method |
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