CN203522544U - Low-noise self-excited push-pull converter - Google Patents

Low-noise self-excited push-pull converter Download PDF

Info

Publication number
CN203522544U
CN203522544U CN201320687257.XU CN201320687257U CN203522544U CN 203522544 U CN203522544 U CN 203522544U CN 201320687257 U CN201320687257 U CN 201320687257U CN 203522544 U CN203522544 U CN 203522544U
Authority
CN
China
Prior art keywords
coil
transformer
npn type
type triode
magnetic bead
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201320687257.XU
Other languages
Chinese (zh)
Inventor
薛涛
陈华聪
覃周
陈忠富
卢志飞
吕亚潮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GUANGZHOU AIPU ELECTRON TECHNOLOGY Co Ltd
Original Assignee
GUANGZHOU AIPU ELECTRON TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GUANGZHOU AIPU ELECTRON TECHNOLOGY Co Ltd filed Critical GUANGZHOU AIPU ELECTRON TECHNOLOGY Co Ltd
Priority to CN201320687257.XU priority Critical patent/CN203522544U/en
Application granted granted Critical
Publication of CN203522544U publication Critical patent/CN203522544U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model discloses a low-noise self-excited push-pull converter. The primary side coil of a transformer of the low-noise self-excited push-pull converter is provided with a first tap. One end of the primary side coil of the transformer is connected with the collector of a NPN-type transistor Q1. The other end of the primary side coil of the transformer T1 is connected with the collector of a NPN-type transistor Q2. The auxiliary coil is provided with a second tap. The voltage input end is connected to the second tap through a parallel branch formed by resistors and capacitors. One end of the auxiliary coil is connected with the base of the NPN-type transistor Q1. The other end of the auxiliary coil is connected with the base of the NPN-type transistor Q2. The emitter of the NPN-type transistor Q1 and the emitter of the NPN-type transistor Q2 are grounded through magnetic beads. According to the utility model, the magnetic beads having large high-frequency loss are adopted, so the advantage of high magnetic permeability can be realized, the capacitance between coil windings generated in the high-frequency and high-resistance condition can be minimized, the voltage stress of a switching tube can be reduced, the switching loss can be reduced, the output noise can be reduced, and the working efficiency of the converter can be improved.

Description

Low noise self-excited push-pull type transducer
Technical field
The utility model relates to switching power converters technical field, is specifically related to a kind of low noise self-excited push-pull type transducer.
Background technology
The circuit structure of existing self-excited push-pull type transducer is from the self-oscillation push-pull transistor single phase transformer DC converter of nineteen fifty-five U.S. Luo Ye (G.H.Royer) invention, this is also the beginning of realizing high frequency conversion control circuit, partial circuit from nineteen fifty-seven the U.S. look into match (Jen Sen, also translations " well is gloomy ") auto-excitation type of invention is recommended dual transformer circuit, after be called as self-oscillation JenSen circuit, these two kinds of circuit, descendant is referred to as self-excited push-pull type transducer.
Existing self-excited push-pull type transducer is widely applied in life, as Royer circuit, this transducer element is few, and circuit is simple, is operated in open loop situations, also just because of this, this converter is in AC smallsignal model is analyzed, and the input impedance of small-signal is just to hinder, and is connected while using with other Switching Power Supplies, as rear class or the prime of self-excited push-pull type transducer as the Switching Power Supply of other closed loop, there is splendid inter-stage connection performance.
But, it should be noted that, self-excited push-pull type transducer is operated in high frequency state, the rectifier diode of transformer coil and outlet side is on off state, its current/voltage transient state sharply changes, produce the impulse wave of high fdrequency component, while is due to storage effect and the reversely restoring process of transformer leakage inductance, lead-in inductance, distributed capacitance, filter inductance, filter capacitor and diode, produce inrush current spike and the higher-order of oscillation, cause output voltage to have very large noise, easily cause puncturing and damage of switching tube simultaneously.
Utility model content
The utility model provides a kind of low noise self-excited push-pull type transducer, can address the above problem.
A kind of low noise self-excited push-pull type transducer that the utility model embodiment provides, comprise: transformer T1, ancillary coil T2, NPN type triode Q1, NPN type triode Q2, magnetic bead, rectifier diode D1 and rectifier diode D2, the primary coil of transformer T1 has one for connecting the first tap of voltage input end Vin, transformer T1 primary coil one end connects the collector electrode of NPN type triode Q1, the other end of transformer T1 primary coil connects the collector electrode of NPN type triode Q2, ancillary coil T2 has one second tap, voltage input end Vin is connected to this second tap through the parallel branch consisting of resistance R 3 and capacitor C 3, one end of ancillary coil T2 connects the base stage of NPN type triode Q2, the other end of ancillary coil T2 connects the base stage of NPN type triode Q1, the emitter of NPN type triode Q1 and NPN type triode Q2 is by magnetic bead ground connection, the secondary coil of transformer T1 has one for being connected to the 3rd tap on power supply ground, the secondary coil two ends of transformer T1 power to voltage output end Vout by rectifier diode D1 and rectifier diode D2 respectively, an energy storage filter capacitor C2 in parallel between voltage output end Vout and power supply ground.
Preferably, the emitter of NPN type triode Q1 and NPN type triode Q2 is respectively by the first magnetic bead FB1 and the second magnetic bead FB2 ground connection.
Preferably, voltage input end Vin is through a filter capacitor C1 ground connection.
Preferably, the upper voltage-stabiliser tube in parallel of energy storage filter capacitor C2.
Preferably, the permeability of described the first magnetic bead FB1 and the second magnetic bead FB2 is respectively 15000 μ~20000 μ.
Technique scheme can be found out, because the utility model embodiment adopts the very large magnetic bead of high-frequency loss, there is very high permeability, can make the electric capacity minimum producing between coil windings in the situation that of high frequency high resistant, reduce the voltage stress of switching tube, reduce switching loss, reduce output noise, improve the operating efficiency of converter.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit theory diagrams of the utility model embodiment converter.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making all other embodiment that obtain under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment:
The utility model embodiment provides a kind of low noise self-excited push-pull type transducer, as shown in Figure 1, comprise: transformer T1, ancillary coil T2, NPN type triode Q1, NPN type triode Q2, magnetic bead, rectifier diode D1 and rectifier diode D2, the primary coil of transformer T1 has one for connecting the first tap of voltage input end Vin, transformer T1 primary coil one end connects the collector electrode of NPN type triode Q1, the other end of transformer T1 primary coil connects the collector electrode of NPN type triode Q2, ancillary coil T2 has one second tap, voltage input end Vin is connected to this second tap through the parallel branch consisting of resistance R 3 and capacitor C 3, one end of ancillary coil T2 connects the base stage of NPN type triode Q2, the other end of ancillary coil T2 connects the base stage of NPN type triode Q1, the emitter of NPN type triode Q1 and NPN type triode Q2 is by magnetic bead ground connection, the secondary coil of transformer T1 has one for being connected to the 3rd tap on power supply ground, the secondary coil two ends of transformer T1 power to voltage output end Vout by rectifier diode D1 and rectifier diode D2 respectively, an energy storage filter capacitor C2 in parallel between voltage output end Vout and power supply ground, ancillary coil T2 and the coupling of transformer T1 primary coil.
In order further to reduce to disturb, the emitter of NPN type triode Q1 and NPN type triode Q2 is respectively by the first magnetic bead FB1 and the second magnetic bead FB2 ground connection.
In order to reduce the interference of input, voltage input end Vin is through a filter capacitor C1 ground connection.
In the utility model embodiment, the permeability of the first magnetic bead FB1 and the second magnetic bead FB2 is all selected the magnetic bead of high permeability, its permeability Application Range is respectively 15000 μ~20000 μ, particularly, the permeability of the first magnetic bead FB1 and the second magnetic bead FB2 is 17500 μ.
The ferrite (magnetic bead) of using for inhibition electromagnetic interference, most important performance parameter is permeability and saturation flux density, magnetic permeability can be expressed as plural number, and real part forms inductance, and imaginary part represents loss, this loss increases along with the increase of frequency, therefore, the series circuit of the equivalent electric circuit of this magnetic bead for being formed by inductance L and resistance R, the impedance of magnetic bead increases along with the rising of frequency in form, but when different frequency, the mechanism of magnetic bead impedance is applicable different.
The emitter of NPN type triode Q1 and NPN type triode Q2 is respectively by the first magnetic bead FB1 and the second magnetic bead FB2 ground connection in the present embodiment, in low-frequency range, impedance consists of the induction reactance of inductance, and during low frequency, resistance R is very little, magnetic bead permeability is higher, inductance value is larger, and inductance L plays Main Function, and electromagnetic interference is reflected and is suppressed, and at this moment the loss of magnetic bead is less, whole device is the inductance of a low-loss, High Power Factor characteristic; At high band, magnetic bead impedance consists of resistance components, along with frequency raises, the permeability of magnetic bead reduces, cause the inductance L of inductance to reduce, induction reactance composition reduces, still, the loss of magnetic bead increases, resistance components increases, and causes total impedance to increase, when high-frequency signal passes through magnetic bead, electromagnetic interference is absorbed, and the form of energy transform into heat energy dissipates.
As can be seen here, can reduce the voltage stress of NPN type triode Q1 and NPN type triode Q2 in the present embodiment by increasing the first magnetic bead FB1 and the second magnetic bead FB2, reduce switching loss, reducing noise output, improves converter operating efficiency.
The low noise self-excited push-pull type transducer above the utility model embodiment being provided is described in detail, applied specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment is just for helping to understand core concept of the present utility model; , for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model meanwhile.

Claims (5)

1. low noise self-excited push-pull type transducer, it is characterized in that, comprise: transformer T1, ancillary coil T2, NPN type triode Q1, NPN type triode Q2, magnetic bead, rectifier diode D1 and rectifier diode D2, the primary coil of transformer T1 has one for connecting the first tap of voltage input end Vin, transformer T1 primary coil one end connects the collector electrode of NPN type triode Q1, the other end of transformer T1 primary coil connects the collector electrode of NPN type triode Q2, ancillary coil T2 has one second tap, voltage input end Vin is connected to this second tap through the parallel branch consisting of resistance R 3 and capacitor C 3, one end of ancillary coil T2 connects the base stage of NPN type triode Q2, the other end of ancillary coil T2 connects the base stage of NPN type triode Q1, the emitter of NPN type triode Q1 and NPN type triode Q2 is by magnetic bead ground connection, the secondary coil of transformer T1 has one for being connected to the 3rd tap on power supply ground, the secondary coil two ends of transformer T1 power to voltage output end Vout by rectifier diode D1 and rectifier diode D2 respectively, an energy storage filter capacitor C2 in parallel between voltage output end Vout and power supply ground.
2. low noise self-excited push-pull type transducer as claimed in claim 1, is characterized in that, the emitter of NPN type triode Q1 and NPN type triode Q2 is respectively by the first magnetic bead FB1 and the second magnetic bead FB2 ground connection.
3. low noise self-excited push-pull type transducer as claimed in claim 1 or 2, is characterized in that, voltage input end Vin is through a filter capacitor C1 ground connection.
4. low noise self-excited push-pull type transducer as claimed in claim 1 or 2, is characterized in that, the upper voltage-stabiliser tube in parallel of energy storage filter capacitor C2.
5. low noise self-excited push-pull type transducer as claimed in claim 2, is characterized in that, the permeability of described the first magnetic bead FB1 and the second magnetic bead FB2 is respectively 15000 μ~20000 μ.
CN201320687257.XU 2013-11-01 2013-11-01 Low-noise self-excited push-pull converter Active CN203522544U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320687257.XU CN203522544U (en) 2013-11-01 2013-11-01 Low-noise self-excited push-pull converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320687257.XU CN203522544U (en) 2013-11-01 2013-11-01 Low-noise self-excited push-pull converter

Publications (1)

Publication Number Publication Date
CN203522544U true CN203522544U (en) 2014-04-02

Family

ID=50381415

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201320687257.XU Active CN203522544U (en) 2013-11-01 2013-11-01 Low-noise self-excited push-pull converter

Country Status (1)

Country Link
CN (1) CN203522544U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104993678A (en) * 2015-07-31 2015-10-21 安徽中杰信息科技有限公司 Design process of integrated power supply of light ionized gas alarm device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104993678A (en) * 2015-07-31 2015-10-21 安徽中杰信息科技有限公司 Design process of integrated power supply of light ionized gas alarm device

Similar Documents

Publication Publication Date Title
US20170294833A1 (en) Multiphase Coupled and Integrated Inductors with Printed Circuit Board (PCB) Windings for Power Factor Correction (PFC) Converters
CN202077249U (en) Electromagnetic interference preventing and protecting device
US20130049918A1 (en) Common Mode Choke Apparatus and Method
US20140022826A1 (en) Quasi resonant push-pull converter and control method thereof
Yang et al. Common mode EMI reduction technique for interleaved MHz critical mode PFC converter with coupled inductor
TWI497908B (en) Method of improving performance of wave filter and power conversion device using same
CN202424533U (en) Wide-region high-voltage output converter
CN104135154A (en) Isolated four-element resonance circuit and control method
CN203708109U (en) LCC resonant converter
CN203522544U (en) Low-noise self-excited push-pull converter
CN101610027B (en) Electromagnetic interference suppression circuit for correcting power factor
Makda et al. Common mode noise generation and filter design for a hard switched isolated full-bridge forward converter
CN206163275U (en) Transformer
TW202011675A (en) Voltage converter and voltage conversion method for reducing common mode noise
CN101951140B (en) EMI (Electro-Magnetic Interference) filter of electrodeless fluorescent lamp with ultracrystalline filter coil CL+CL structure
CN204810143U (en) Anti -electromagnetic interference switching power supply
CN102881412A (en) Energy-generation transformer
CN104796004A (en) DC (direct current)-DC converter
CN105991044B (en) Non-contact power supply secondary side rectifying circuit and method
CN103762869B (en) A kind of Type of Switch Stabilivolt Source Circuit
Liu et al. Integrated magnetics design for an interleaved three-phase buck converter
CN203775018U (en) Low-frequency high-power airborne three-phase four-wire AC power supply filter
CN203775062U (en) Non-controlling APFC single-stage AC-DC topological structure
CN103647452B (en) A kind of single tube soft switch BUCK converter
CN203351329U (en) Inversion inductors based on high-frequency UPS

Legal Events

Date Code Title Description
GR01 Patent grant
C14 Grant of patent or utility model