CN112701927A - Programmable multi-mode flyback automatic frequency increasing method for switching power supply - Google Patents
Programmable multi-mode flyback automatic frequency increasing method for switching power supply Download PDFInfo
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- CN112701927A CN112701927A CN202110099242.0A CN202110099242A CN112701927A CN 112701927 A CN112701927 A CN 112701927A CN 202110099242 A CN202110099242 A CN 202110099242A CN 112701927 A CN112701927 A CN 112701927A
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- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
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- 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
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a method for automatically increasing the frequency of a programmable multi-mode flyback of a switching power supply, which comprises the following steps: an input rectifying and filtering unit, an output load feedback detection unit, an output current detection unit, an auxiliary voltage detection unit and a voltage detection unit are arranged; the MCU control unit mainly comprises a singlechip U1; the single chip microcomputer U1 is used for completing feedback acquisition and judgment of output voltage signals and output current states, meanwhile, calculation is carried out according to the information, different PWM frequencies are output at an output pin 0UT, and the working mode of the power supply is controlled. The invention replaces the traditional analog integrated circuit with a programmable singlechip, combines program design, realizes intelligent switching use of three modes of the flyback circuit according to the situation, realizes advantage complementation, and finally realizes the advantages that the product realizes high power density and high energy efficiency of 0.65W/cm3, the input voltage range of 80 Vac-264 Vac is wide, and the total cost is reduced by about 10 percent due to the reduction of the volume of a magnetic device.
Description
Technical Field
The invention relates to a switching power supply technology, in particular to a programmable multi-mode flyback automatic frequency increasing method for a switching power supply.
Background
The flyback power adapter generally uses a traditional analog IC, and the operating frequency of the traditional analog IC is generally fixed.
However, in some application scenarios requiring a large instantaneous power, such as a sound box power supply and a printer power supply, the instantaneous power occasionally reaches hundreds of watts and lasts for tens of milliseconds, for example, according to a conventional design, if the instantaneous high power is to be satisfied, the power of the power supply should be designed and manufactured to be the conventional power, which is larger than the instantaneous high power, so that the power supply has a too large volume and too high cost, which is easy to cause excessive design, and is not favorable for market promotion.
Secondly, when the low-power supply is used for dealing with the transient high power, the transformer is saturated, and cannot provide the high power required by the load, so that the operation of the load terminal is seriously abnormal.
In summary, the flyback power supply with a single operating frequency of the conventional analog integrated circuit cannot meet the application scenario with the requirement of transient peak power.
The above problems need to be solved.
After being inquired, no relevant report is found.
Disclosure of Invention
The invention aims to solve the problem that a flyback power supply with a single working frequency of a traditional analog integrated circuit in the prior art cannot meet an application scene with a transient peak power requirement, provides a programmable multi-mode flyback automatic frequency increasing method for a switching power supply, improves the power density of a product and solves the problem.
In order to achieve the purpose, the invention provides the following technical scheme:
the method for programmable multi-mode flyback automatic frequency increasing of the switching power supply is designed and implemented, and comprises the following steps:
step one, setting in a switching power supply circuit:
the input rectifying and filtering unit consists of a filtering inductor LF1, a filtering inductor LF2, a rectifier bridge stack BD1, a rectifier bridge stack BD2 and an X capacitor CX1 and is used for rectifying input alternating current into direct current and shaping sawtooth wave current at the rear end into a current waveform close to sinusoidal envelope;
the output load feedback detection unit consists of a photoelectric coupler U3, a current-limiting resistor R17, a resistor R25, a resistor R33, a resistor R34, a resistor R36 and a capacitor C13 and is used for receiving a feedback signal of a secondary side and adjusting output voltage timely;
an output current detection unit consisting of a resistor R29 and a magnetic bead B1;
the auxiliary voltage detection unit consists of a resistor R32 and a resistor R16 and is used for detecting an output voltage signal;
and the MCU control unit mainly composed of a singlechip U1 is used for finishing feedback acquisition and judgment of output voltage signals and output current states, meanwhile, calculation is carried out according to the information, different PWM frequencies are output at an output pin 0UT, and the working mode of the power supply is controlled.
Loading a COMP terminal voltage discrimination program module below 1.8V, a COMP terminal voltage discrimination program module between 1.8V and 2.2V, a COMP terminal voltage discrimination program module above 2.2V, a 25KHz PWM generation program module, a 65KHz PWM generation program module and a 130KHz PWM generation program module in a program memory of a single chip microcomputer U1, wherein all the program modules can be loaded and operated by a processor;
connecting an output load feedback detection unit to a COMP end of the single chip microcomputer U1, connecting an output current detection unit to a CS end of the single chip microcomputer U1, and connecting an auxiliary voltage detection unit to a FB end of the single chip microcomputer U1;
step four, when the voltage of a COMP pin is lower than 1.8V after the secondary of the switching power supply enters a working stage, the power supply works in an intermittent mode, and a 25KHz PWM control signal is output from an OUT pin of the single chip microcomputer U1;
step five, next; when the voltage of the COMP pin is higher than 1.8V and lower than 2.2V, the power supply works in a quasi-resonance mode, and a PWM control signal of 65KHz is output from an OUT pin of the singlechip U1;
step six, when the voltage of the COMP pin is higher than 2.2V, the power supply is switched to a continuous working mode from a quasi-resonance mode, and a 130KHz PWM control signal is output from an OUT pin of the single chip microcomputer U1; the output power is increased, and the risk of saturation of the transformer is avoided at the same time due to the increase of the working frequency.
In the above method, in the first step, the connection method between the rectifier bridge stack BD1 and the rectifier bridge stack BD2 is: two alternating current input ends of the rectifier bridge BD1 are connected in parallel and then connected with a first alternating current end, a positive output end is connected with the same-name end of the transformer T1A, and a negative output end is connected with PGND;
two alternating current input ends of the rectifier bridge BD2 are connected in parallel and then connected with a second alternating current end, a positive output end is connected with the same-name end of the transformer T1A, and a negative output end is connected with PGND.
In the method, the resistor R32 in the step one is connected in series with a resistor R27, the other end of the resistor R27 is connected with the non-homonymous end of the transformer T1B, one end of the resistor R16 is connected with the resistor R32, the connection point is connected with the FB end of the singlechip U1, and the other end of the resistor R16 is connected with PGND.
In the method, the OUT pin of the singlechip U1 in the fourth step is connected with the gate of the field-effect transistor Q1 through the resistor R19 and the resistor R20, and the filter unit composed of the resistor 35 and the capacitor C17 is connected between the gate and the drain of the field-effect transistor Q1.
Compared with the prior art that the flyback converter has a single working mode and fixed frequency, and cannot meet the design requirement of an instantaneous high-power miniaturized power supply due to the problems of the volume of a product and the magnetic saturation of a transformer, the invention replaces the traditional analog integrated circuit with a programmable singlechip, combines program design, realizes the intelligent switching use of three modes of the flyback converter according to the situation, realizes the advantage complementation, finally realizes the high power density and the high energy efficiency of 0.65W/cm3 of the product, has a wide input voltage range of 80 Vac-264 Vac, and has the advantage that the overall cost is reduced by about 10 percent due to the reduction of the volume of a magnetic device.
Drawings
FIG. 1 is an electrical schematic diagram of a programmable multi-mode flyback automatic frequency-boosting method of a switching power supply according to the present invention;
fig. 2 is a schematic block diagram of a related pin of a single chip microcomputer U1DE COMP in the method for programmable multi-mode flyback automatic frequency up-conversion of the switching power supply according to the present invention;
fig. 3 is a flowchart of a single chip unit U1 in the method for programmable multi-mode flyback automatic frequency up of the switching power supply of the present invention;
fig. 4 is a program setting diagram of a single chip unit U1 in the method for programmable multi-mode flyback auto-up-conversion of the switching power supply according to the present invention.
Detailed Description
As shown in fig. 1 to 4, the method for programmable multi-mode flyback auto-boost of a switching power supply of the present invention includes:
step one, setting in a switching power supply circuit:
the input rectifying and filtering unit consists of a filtering inductor LF1, a filtering inductor LF2, a rectifier bridge stack BD1, a rectifier bridge stack BD2 and an X capacitor CX1 and is used for rectifying input alternating current into direct current and shaping sawtooth wave current at the rear end into a current waveform close to sinusoidal envelope;
the output load feedback detection unit consists of a photoelectric coupler U3, a current-limiting resistor R17, a resistor R25, a resistor R33, a resistor R34, a resistor R36 and a capacitor C13 and is used for receiving a feedback signal of a secondary side and adjusting output voltage timely;
an output current detection unit consisting of a resistor R29 and a magnetic bead B1;
the auxiliary voltage detection unit consists of a resistor R32 and a resistor R16 and is used for detecting an output voltage signal;
and the MCU control unit mainly composed of a singlechip U1 is used for finishing feedback acquisition and judgment of output voltage signals and output current states, meanwhile, calculation is carried out according to the information, different PWM frequencies are output at an output pin 0UT, and the working mode of the power supply is controlled.
Step two, a voltage discrimination program module 101 below a COMP end 1.8V, a voltage discrimination program module 102 between a COMP end 1.8V and 2.2V, a voltage discrimination program module 103 above the COMP end 2.2V, a 25KHz PWM generation program module 104, a 65KHz PWM generation program module 105 and a 130KHz PWM generation program module 106 are loaded and operated in a program memory 11 of a singlechip U1, and all the program modules can be loaded and operated by a processor 12, and a program operation variable temporary storage 13 is used for temporarily storing operation data;
connecting an output load feedback detection unit to a COMP end of the single chip microcomputer U1, connecting an output current detection unit to a CS end of the single chip microcomputer U1, and connecting an auxiliary voltage detection unit to a FB end of the single chip microcomputer U1;
step four, when the voltage of a COMP pin is lower than 1.8V after the secondary of the switching power supply enters a working stage, the power supply works in an intermittent mode, and a 25KHz PWM control signal is output from an OUT pin of the single chip microcomputer U1;
step five, next; when the voltage of the COMP pin is higher than 1.8V and lower than 2.2V, the power supply works in a quasi-resonance mode, and a PWM control signal of 65KHz is output from an OUT pin of the singlechip U1;
step six, when the voltage of the COMP pin is higher than 2.2V, the power supply is switched to a continuous working mode from a quasi-resonance mode, and a 130KHz PWM control signal is output from an OUT pin of the single chip microcomputer U1; the output power is increased, and the risk of saturation of the transformer is avoided at the same time due to the increase of the working frequency.
In the above method, in the first step, the connection method between the rectifier bridge stack BD1 and the rectifier bridge stack BD2 is: two alternating current input ends of the rectifier bridge BD1 are connected in parallel and then connected with a first alternating current end, a positive output end is connected with the same-name end of the transformer T1A, and a negative output end is connected with PGND;
in the method, two alternating current input ends of the rectifier bridge BD2 are connected in parallel and then connected with a second alternating current end, a positive output end is connected with the end with the same name of the transformer T1A, and a negative output end is connected with PGND ground.
In the method, the resistor R32 in the step one is connected in series with a resistor R27, the other end of the resistor R27 is connected with the non-homonymous end of the transformer T1B, one end of the resistor R16 is connected with the resistor R32, the connection point is connected with the FB end of the singlechip U1, and the other end of the resistor R16 is connected with PGND.
In the method, the OUT pin of the singlechip U1 in the fourth step is connected with the gate of the field-effect transistor Q1 through the resistor R19 and the resistor R20, and the filter unit composed of the resistor 35 and the capacitor C17 is connected between the gate and the drain of the field-effect transistor Q1.
The singlechip U1 can be STC15W series singlechip with A/D function inside.
As shown in fig. 1 and fig. 2, the circuit principle related to the COMP pin of the single chip microcomputer U1 is as follows: the two input ends FB and CS of the error voltage amplifier detect the power change of a load side, the output end of the error voltage amplifier is connected with a COMP end, the COMP end is provided with a pull-up resistor R41 connected with VDD, the COMP end is also connected with a signal receiver of a photoelectric coupler U3B, the collector potential of the signal receiver of U3B changes along with the power change of the load side, namely the potential of the COMP end changes along with the power change of the load side, the potential is used for carrying OUT A/D conversion on a processor core, and the conversion result controls the PWM signal frequency output of an OUT pin.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (4)
1. A method for the programmable multi-mode flyback automatic frequency raising of a switching power supply is characterized by comprising the following steps:
step one, setting in a switching power supply circuit:
the input rectifying and filtering unit consists of a filtering inductor LF1, a filtering inductor LF2, a rectifier bridge stack BD1, a rectifier bridge stack BD2 and an X capacitor CX1 and is used for rectifying input alternating current into direct current and shaping sawtooth wave current at the rear end into a current waveform close to sinusoidal envelope;
the output load feedback detection unit consists of a photoelectric coupler U3, a current-limiting resistor R17, a resistor R25, a resistor R33, a resistor R34, a resistor R36 and a capacitor C13 and is used for receiving a feedback signal of a secondary side and adjusting output voltage timely;
an output current detection unit mainly composed of a resistor R29 and a magnetic bead B1;
the auxiliary voltage detection unit consists of a resistor R32 and a resistor R16 and is used for detecting an output voltage signal;
the MCU control unit mainly composed of a singlechip U1 is used for finishing feedback acquisition and judgment of output voltage signals and output current states, meanwhile, calculation is carried out according to the information, different PWM frequencies are output at an output pin 0UT, and the working mode of the power supply is controlled;
step two, a voltage discrimination program module (101) below a COMP end 1.8V, a voltage discrimination program module (102) between the COMP end 1.8V and 2.2V, a voltage discrimination program module (103) above the COMP end 2.2V, a 25KHzPWM generation program module (104), a 65KHzPWM generation program module (105) and a 130KHzPWM generation program module (106) are loaded in a program memory (11) of a singlechip U1, and all the program modules can be loaded and operated by a processor (12);
connecting an output load feedback detection unit to a COMP end of the single chip microcomputer U1, connecting an output current detection unit to a CS end of the single chip microcomputer U1, and connecting an auxiliary voltage detection unit to a FB end of the single chip microcomputer U1;
step four, when the voltage of a COMP pin is lower than 1.8V after the secondary of the switching power supply enters a working stage, the power supply works in an intermittent mode, and a 25KHz PWM control signal is output from an OUT pin of the single chip microcomputer U1;
step five, next; when the voltage of the COMP pin is higher than 1.8V and lower than 2.2V, the power supply works in a quasi-resonance mode, and a PWM control signal of 65KHz is output from an OUT pin of the singlechip U1;
step six, when the voltage of the COMP pin is higher than 2.2V, the power supply is switched to a continuous working mode from a quasi-resonance mode, and a 130KHz PWM control signal is output from an OUT pin of the single chip microcomputer U1; the output power is increased, and the risk of saturation of the transformer is avoided at the same time due to the increase of the working frequency.
2. The method of claim 1, wherein the method comprises the following steps: step one, the connection method of the rectifier bridge stack BD1 and the rectifier bridge stack BD2 comprises the following steps: two alternating current input ends of the rectifier bridge BD1 are connected in parallel and then connected with a first alternating current end, a positive output end is connected with the same-name end of the transformer T1A, and a negative output end is connected with PGND;
two alternating current input ends of the rectifier bridge BD2 are connected in parallel and then connected with a second alternating current end, a positive output end is connected with the same-name end of the transformer T1A, and a negative output end is connected with PGND.
3. The method of claim 1, wherein the method comprises the following steps: the resistor R32 in the first step is connected in series with a resistor R27, the other end of the resistor R27 is connected with a non-homonymous end of the transformer T1B, one end of the resistor R16 is connected with the resistor R32, a connection point is connected with an FB end of the singlechip U1, and the other end of the resistor R16 is connected with PGND.
4. The method of claim 1, wherein the method comprises the following steps: and the OUT pin of the singlechip U1 in the step four is connected with the grid of the field effect transistor Q1 through a resistor R19 and a resistor R20, and a filtering unit consisting of a resistor 35 and a capacitor C17 is connected between the grid and the drain of the field effect transistor Q1.
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| CN202110099242.0A CN112701927A (en) | 2021-01-25 | 2021-01-25 | Programmable multi-mode flyback automatic frequency increasing method for switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114977768A (en) * | 2022-06-01 | 2022-08-30 | 东莞市石龙富华电子有限公司 | Power adapter primary side circuit adopting program to control on-off of PFC function |
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Application publication date: 20210423 |