CN107425724A - Flyback sourse preloading device - Google Patents

Flyback sourse preloading device Download PDF

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Publication number
CN107425724A
CN107425724A CN201710692382.2A CN201710692382A CN107425724A CN 107425724 A CN107425724 A CN 107425724A CN 201710692382 A CN201710692382 A CN 201710692382A CN 107425724 A CN107425724 A CN 107425724A
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CN
China
Prior art keywords
module
output
input
electrically connected
resistance
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Granted
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CN201710692382.2A
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Chinese (zh)
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CN107425724B (en
Inventor
曹骥
陆剑波
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Zhejiang Hangke Instrument Co ltd
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HANGZHOU RELIABILITY ELECTRONIC Ltd
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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
    • 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
    • H02M1/0083—Converters characterised by their input or output configuration
    • 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

Flyback sourse preloading device, including housing, input filter module, power conversion module, output rectification module, output filter module, PWM control modules and isolation feedback module and preload control module, the input filter module, power conversion module, output rectification module, output filter module, PWM control modules and isolation feedback module and preload control module are installed in the housing.The beneficial effects of the invention are as follows：By increasing flyback sourse controllable preload circuit, reach and reduce power consumption and heat, improve power-efficient, and make to keep stable device when output voltage is unloaded or load is smaller.Increase controllable PNP triode in power output end and realize that preload circuit is controllable, make voltage stabilization when power supply is unloaded or load is smaller.

Description

Flyback sourse preloading device
Technical field
The present invention relates to a kind of flyback sourse preloading device.
Background technology
Flyback sourse is substantially by input filter circuit, pulsewidth modulation or Frequency-variable Modulation circuit, power transformer, output at present Current rectifying and wave filtering circuit and separation feedback control circuit are formed.Flyback sourse voltage is required for certain stability requirement, and flyback For power supply when unloaded or load is smaller because electric current is discontinuous, its output voltage is unstable, is typically all fixed using output increase Preload makes output voltage obtain stabilization.During power supply normal work, increased preload circuit can produce a large amount of power consumptions of increase and Waste heat, reduce the efficiency index of device.
The content of the invention
In order to solve the above problems, the present invention proposes a kind of monitoring by output duty cycle, when power supply dutycycle It is automatic to disconnect output preload circuit when reaching to a certain degree, reach and reduce power consumption and heat, improve power-efficient, and make Stable flyback sourse preloading device is kept when output voltage is unloaded or loads smaller.
Flyback sourse preloading device of the present invention, it is characterised in that：Including housing, input filter module, power Modular converter, output rectification module, output filter module, PWM control modules and isolation feedback module and preload control mould Block, the input filter module, power conversion module, output rectification module, output filter module, PWM control modules and every It is installed in from feedback module and preload control module in the housing, the housing, which is provided with, to be used to draw flyback sourse The output plughole of the input jack of voltage input end and the voltage output end for drawing flyback sourse；The input filter mould The input of block as flyback sourse voltage input end after the input jack of housing is drawn, be electrically connected with externally fed power supply； The output end of the input filter module and the signal input part of the power conversion module are electrically connected, the power conversion module The input of first output end and the PWM control modules is electrically connected, and the output end of the PWM control modules isolates feedback with described The input of module is electrically connected, and the first input end of the output end and the output filter module of the isolation feedback module is electrically connected； Second output end of the power conversion module and the input of transformer are electrically connected, the output end of the transformer and the output The first input end of rectification module is electrically connected, and second input for exporting rectification module is defeated with the preload control module Go out end to be electrically connected, the second input of the output end and the output filter module of the output rectification module is electrically connected；The output The output end of filtration module as flyback sourse voltage output end after the output plughole of housing is drawn, with external electric equipment It is electrically connected.
The output rectification module includes diode, the PNP triode for control circuit break-make, first resistor, second Resistance, 3rd resistor, electric capacity and adjustment resistance, the transformer, diode, first resistor and second resistance by wire successively The rectification circuit of closure is connected into, the wherein positive pole of diode and the output end of transformer is electrically connected, the negative pole of diode and first Resistance is electrically connected；The electric capacity is in parallel with second resistance, and the first end of wherein electric capacity is connected with 3rd resistor, and the second end of electric capacity is made It is electrically connected for the voltage output end and external electric equipment of flyback sourse；The 3rd resistor, PNP triode and adjustment resistance lead to Cross wired in series and form bleeder circuit, the wherein base stage (i.e. B poles) of PNP triode and the 3rd is electrically connected circuit, the collection of PNP triode Electrode (i.e. C poles) and the output end of preload control module are electrically connected, emitter stage (i.e. E poles) and the adjustment resistance string of PNP triode The second end that electric capacity is incorporated to after connection is electrically connected.
The adjustment resistance includes the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance, wherein the 4th electricity Resistance, the 5th resistance, the 6th resistance and the 7th resistance pass through corresponding conductor in parallel.
The housing is regular hexahedron metal-back, and input jack and output plughole are arranged to dual-in-line jack, i.e., described The voltage input end and voltage output end of flyback sourse are the dual-in-line pin for external connection.
The housing is provided with 8 lead ports, respectively output plus terminal, output ground, two dead ends, forbid holding, input Anode, input ground and shell.
The technical solution adopted for the present invention to solve the technical problems is：Increase extra rectified current in transformer secondary side The PNP triode on road, bleeder circuit and controllable turn-on and turn-off.By diode rectification, electric resistance partial pressure, in transistor base Produce the voltage with transformer change in duty cycle, transistor emitter connection power supply output.When transformer dutycycle is small, Electric power output voltage is higher than transistor base voltage, triode ON, power supply output preload circuit turn-on, so that output electricity Pressure is stable.When transformer dutycycle is big, electric power output voltage is less than transistor base voltage, triode shut-off, preload electricity Road disconnects, and reduces power supply power consumption and improves efficiency.
The beneficial effects of the invention are as follows：By increasing controllable preload circuit to flyback sourse, reach reduce power consumption and Heat, power-efficient is improved, and make to keep stable device when output voltage is unloaded or load is smaller.Increase in power output end Add controllable PNP triode to realize that preload circuit is controllable, make voltage stabilization when power supply is unloaded or load is smaller.
Brief description of the drawings
Fig. 1 is internal module connection diagram (the wherein V of the present inventioninRepresent the voltage input end of flyback sourse；VoutGeneration The voltage output end of table flyback sourse).
Fig. 2 is the output rectification module structure chart (V of the present inventiono +Represent the voltage input end of bleeder circuit；Vo -Represent and divide The voltage output end of volt circuit).
(abscissa is the time to the voltage oscillogram of triode B, E poles, per lattice 4us when Fig. 3 is dutycycle 5%；Ordinate For voltage, every lattice 2V).
(abscissa is the time to the voltage oscillogram of PNP triode B, E pole, per lattice 4us when Fig. 4 is dutycycle 30%；It is vertical Coordinate is voltage, per lattice 2V).
Fig. 5 is the pin schematic diagram of the housing of the present invention.
Fig. 6 is the structure chart of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with the accompanying drawings, referring to the drawings：
The flyback sourse preloading device of the present invention of embodiment 1, including housing 8, input filter module 1, power turn Change the mold block 2, output rectification module 3, output filter module 4, PWM control modules 5 and isolation feedback module 6 and preload control Molding block 7, the input filter module 1, power conversion module 2, output rectification module 3, output filter module 4, PWM controls Module 5 and isolation feedback module 6 and preload control module 7 are installed in the housing, and the housing, which is provided with, to be used for Draw the input jack of voltage input end and the output plughole of the voltage output end for drawing flyback sourse of flyback sourse； The input of the input filter module as flyback sourse voltage input end after the input jack of housing is drawn, with outside Power supply is electrically connected；The output end of the input filter module and the signal input part of the power conversion module are electrically connected, described The input of first output end of power conversion module and the PWM control modules is electrically connected, the output of the PWM control modules End is electrically connected with the input for isolating feedback module, the output end and the output filter module of the isolation feedback module First input end is electrically connected；Second output end of the power conversion module and the input of transformer are electrically connected, the transformer Output end and it is described output rectification module first input end be electrically connected, it is described output rectification module the second input with it is described pre- The output end of load control module is electrically connected, the output end of the output rectification module and the second input of the output filter module End is electrically connected；The output end of the output filter module is drawn as the voltage output end of flyback sourse from the output plughole of housing Afterwards, it is electrically connected with external electric equipment.
The output rectification module 3 includes diode D1, the PNP triodes Q1 for control circuit break-make, first resistor R1, second resistance R2,3rd resistor R3, electric capacity C1 and adjustment resistance, the transformer T1, diode D1, first resistor R1 and Second resistance R2 is sequentially connected in series into the rectification circuit of closure by wire, and wherein diode R1 positive pole and transformer T1's is defeated Go out end to be electrically connected, diode D1 negative pole and first resistor R1 are electrically connected；The electric capacity C1 is in parallel with second resistance R2, wherein electric capacity C1 First end connected with 3rd resistor R3, the voltage output end V of electric capacity C1 the second end as flyback sourseoutWith outside electricity consumption Equipment is electrically connected；The 3rd resistor R3, PNP triode Q1 and adjustment resistance form bleeder circuit by wired in series, wherein PNP triode Q1 base stage B and 3rd resistor R3 is electrically connected, and PNP triode Q1 colelctor electrode C is defeated with preload control module 7 Go out end to be electrically connected, PNP triode Q1 emitter E is electrically connected with being incorporated to electric capacity C1 the second end after adjustment resistant series.
The adjustment resistance includes the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7, wherein described 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 pass through corresponding conductor in parallel.
The housing 8 is regular hexahedron metal-back, and input jack and output plughole are arranged to dual-in-line jack, i.e., described The voltage input end and voltage output end of flyback sourse are the dual-in-line pin for external connection.
In Fig. 1, input filter module will input 28V voltage filters to embodiment 2, pass through power conversion module and transformer T1 isolation conversion and the voltage through exporting rectification module output corresponding requirements, isolate feedback module and are adjusted by monitoring output voltage The dutycycle of PWM control modules makes output voltage keep stable.Preload control module controls according to the size of output duty cycle The conducting and shut-off of preload switch (Q1 in Fig. 2), voltage keeps stable when realizing power supply zero load, reduces electricity when loading larger The effect of source power consumption.
In fig. 2, transformer T1 output waveform is through diode D1 rectifications and first resistor R1, second resistance R2 partial pressures A DC voltage V changed with transformer T1 output duty cycles is produced in PNP triode Q1 base stage Bb.Work as VoWith VbPressure When difference is more than PNP triode Q1 conducting voltage, PNP triode Q1 conductings, the work of preload module.Work as VoWith VbPressure difference it is small When PNP triode Q1 conducting voltage, PNP triode Q1 shut-offs, preload module disconnects.
In figure 3, power supply dutycycle is the output voltage waveforms that 5%, a is flyback sourse, and b is the electricity of transistor base Corrugating.Because both voltage differences are more than PNP triode Q1 conducting voltages, preload module is in running order.
In Fig. 4, power supply dutycycle is the output voltage waveforms that 30%, a is flyback sourse, and b is transistor base voltage wave Shape.Because both voltage differences are less than PNP triode Q1 conducting voltages, preload module is off.Set on the housing Have 8 lead ports, respectively 82, two output plus terminal 81, output ground dead ends (83,84), forbid end 85, input positive terminal 86, Input ground 87 and shell 88.
Table 1 is the definition of circuit output pin
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, protection of the invention Scope is not construed as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention also includes art technology Personnel according to present inventive concept it is conceivable that equivalent technologies mean.

Claims (4)

1. flyback sourse preloading device, it is characterised in that：It is whole including housing, input filter module, power conversion module, output Flow module, output filter module, PWM control modules and isolation feedback module and preload control module, the input filter Module, power conversion module, output rectification module, output filter module, PWM control modules and isolation feedback module and pre- negative Carry control module to be installed in the housing, the housing is provided with the input for the voltage input end for being used to draw flyback sourse The output plughole of jack and the voltage output end for drawing flyback sourse；The input of the input filter module is as anti- The voltage input end of power supply is swashed after the input jack of housing is drawn, and is electrically connected with externally fed power supply；The input filter module Output end and the signal input part of the power conversion module be electrically connected, the first output end of the power conversion module with it is described The input of PWM control modules is electrically connected, the output end of the PWM control modules and the input electricity for isolating feedback module Even, the first input end of the output end and the output filter module of the isolation feedback module is electrically connected；The power modulus of conversion Second output end of block and the input of transformer are electrically connected, the output end of the transformer and the first of the output rectification module Input is electrically connected, and the second input and the output end of the preload control module of the output rectification module are electrically connected, described The second input for exporting the output end and the output filter module of rectification module is electrically connected；The output of the output filter module The voltage output end as flyback sourse is held to be electrically connected after the output plughole of housing is drawn with external electric equipment.
2. flyback sourse preloading device as claimed in claim 1, it is characterised in that：The output rectification module includes two poles Pipe, the PNP triode for control circuit break-make, first resistor, second resistance, 3rd resistor, electric capacity and adjustment resistance, it is described Transformer, diode, first resistor and second resistance be sequentially connected in series into the rectification circuit of closure by wire, wherein diode The output end of positive pole and transformer is electrically connected, and negative pole and the first resistor of diode are electrically connected；The electric capacity is in parallel with second resistance, its The first end of middle electric capacity is connected with 3rd resistor, and the second end of electric capacity is set as the voltage output end of flyback sourse with outside electricity consumption It is standby to be electrically connected；The 3rd resistor, PNP triode and adjustment resistance form bleeder circuit, the wherein poles of PNP tri- by wired in series The base stage of pipe is electrically connected circuit with the 3rd, and the colelctor electrode and the output end of preload control module of PNP triode are electrically connected, the poles of PNP tri- The emitter stage of pipe is electrically connected with being incorporated to the second end of electric capacity after adjustment resistant series.
3. flyback sourse preloading device as claimed in claim 2, it is characterised in that：The adjustment resistance includes the 4th electricity Resistance, the 5th resistance, the 6th resistance and the 7th resistance, wherein the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance lead to Cross corresponding conductor in parallel.
4. flyback sourse preloading device as claimed in claim 1, it is characterised in that：The housing is regular hexahedron metal Shell, input jack and output plughole are arranged to dual-in-line jack, i.e., the voltage input end and voltage output of described flyback sourse Hold as the dual-in-line pin for external connection.
CN201710692382.2A 2017-08-14 2017-08-14 Flyback power supply preloading device Active CN107425724B (en)

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CN107425724B CN107425724B (en) 2023-09-01

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107994547A (en) * 2017-12-08 2018-05-04 杭州可靠性仪器厂 A kind of output current decision maker
CN108683338A (en) * 2018-05-24 2018-10-19 航天长峰朝阳电源有限公司 A kind of self-excitation frequency conversion type soft switching power module

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468722A (en) * 1982-07-28 1984-08-28 Reliance Electric Company Power supply having slope controlled output volt-ampere characteristic
US4521842A (en) * 1982-07-28 1985-06-04 Reliance Electric Company Circuit for controlling the volt-ampere characteristic of a load sharing power supply at no load and for inserting a preload
US5999433A (en) * 1998-01-12 1999-12-07 Vpt, Inc. Half-bridge DC to DC converter with low output current ripple
US6809939B1 (en) * 2003-07-28 2004-10-26 Niko Semiconductor Co., Ltd. Synchronous rectifying control circuit of flyback switching power supply
US20120188801A1 (en) * 2011-01-20 2012-07-26 Ampower Technology Co., Ltd. Flyback power supply system
US20140078789A1 (en) * 2012-09-20 2014-03-20 Iwatt Inc. Switching power converter with secondary-side dynamic load detection and primary-side feedback and control
US20160218628A1 (en) * 2013-10-31 2016-07-28 Dialog Semiconductor Inc. Power converter with dynamic preload
CN207251476U (en) * 2017-08-14 2018-04-17 杭州可靠性仪器厂 Flyback sourse preloading device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468722A (en) * 1982-07-28 1984-08-28 Reliance Electric Company Power supply having slope controlled output volt-ampere characteristic
US4521842A (en) * 1982-07-28 1985-06-04 Reliance Electric Company Circuit for controlling the volt-ampere characteristic of a load sharing power supply at no load and for inserting a preload
US5999433A (en) * 1998-01-12 1999-12-07 Vpt, Inc. Half-bridge DC to DC converter with low output current ripple
US6809939B1 (en) * 2003-07-28 2004-10-26 Niko Semiconductor Co., Ltd. Synchronous rectifying control circuit of flyback switching power supply
US20120188801A1 (en) * 2011-01-20 2012-07-26 Ampower Technology Co., Ltd. Flyback power supply system
US20140078789A1 (en) * 2012-09-20 2014-03-20 Iwatt Inc. Switching power converter with secondary-side dynamic load detection and primary-side feedback and control
US20160218628A1 (en) * 2013-10-31 2016-07-28 Dialog Semiconductor Inc. Power converter with dynamic preload
CN207251476U (en) * 2017-08-14 2018-04-17 杭州可靠性仪器厂 Flyback sourse preloading device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107994547A (en) * 2017-12-08 2018-05-04 杭州可靠性仪器厂 A kind of output current decision maker
CN107994547B (en) * 2017-12-08 2024-04-02 浙江杭可仪器有限公司 Output current judging device
CN108683338A (en) * 2018-05-24 2018-10-19 航天长峰朝阳电源有限公司 A kind of self-excitation frequency conversion type soft switching power module

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Address after: No. 157 Hongda Road, Qiaonan Block, Economic and Technological Development Zone, Xiaoshan District, Hangzhou City, Zhejiang Province, 311200

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Address before: No. 79 Yangjiaqiao, Jianggan District, Hangzhou City, Zhejiang Province, 311251

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