CN208539789U - A kind of high frequency transformer of frequency conversion type Switching Power Supply - Google Patents
A kind of high frequency transformer of frequency conversion type Switching Power Supply Download PDFInfo
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- CN208539789U CN208539789U CN201821014140.4U CN201821014140U CN208539789U CN 208539789 U CN208539789 U CN 208539789U CN 201821014140 U CN201821014140 U CN 201821014140U CN 208539789 U CN208539789 U CN 208539789U
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Abstract
A kind of high frequency transformer of frequency conversion type Switching Power Supply disclosed in the utility model, anti-interference high frequency transformer includes the magnetic ferrite magnetic core, skeleton and the stitch positioned at skeleton bottom of E font shape, magnetic ferrite magnetic core is fixed on skeleton, the mid-wrap of magnetic ferrite magnetic core has armature winding, insulating cell is wound on the outside of armature winding, secondary windings is wound on the outside of insulating cell, adhesive tape is wound in the outside of secondary windings, copper foil open circuit band is equipped between armature winding and the coil of/secondary windings；Flow-limiting voltage-stabilizing module is connected with PWM control module, PWM control module is connected with power conversion modules, power conversion modules are connected with anti-interference high frequency transformer, feedback module is connected between PWM control module and the secondary windings of anti-interference high frequency transformer, filter module is connected with Voltage stabilizing module, and Voltage stabilizing module is connected with current limliting module.The power good of output is reliable, and power factor (PF) is high, strong without harmonic wave interference, reactance voltage impact；So that protection load is not damaged.
Description
Technical field
The utility model relates to a kind of power supply high frequency transformer technical field, especially a kind of height of frequency conversion type Switching Power Supply
Frequency power transformer.
Background technique
The function of power transformer is power transmission, voltage transformation and is dielectrically separated from, as a kind of main soft magnetism electromagnetism
Element is widely used in power technology and in power electronic technique.
In Switching Power Supply, it is to decide Switching Power Supply performance that Switch Power Transformer, which is the power for carrying out electric energy conversion,
The important component of quality.Transformer plays magnetic coupling in switching power circuit, transmission electric energy, storage electric energy, inhibits spike electricity
The effect of pressure and peak current.Frequency oscillator can also be constituted with condenser network, generate resonance, adjustment controls output voltage,
Realize the lifting of voltage.Therefore, the design of Switch Power Transformer is the core of Switching Power Supply design.
And whether stable relation can work normally the electric current that Switching Power Supply is exported through transformer to entire power supply, it is existing
It is generally adopted by common transformer, stability quite poor in technology, and around transformer and is not disposed on frequency
Rate can not adjust when there is deviation, thus stability when influencing transformer output power, while in power supply output,
Current control method generally uses fixed current to limit, and this circuit has the maximum limitation electric current being accurately arranged, not with negative
It carries or short-circuit conditions influences, to will directly work in the load of the power input of short circuit or overcurrent, and then cause to load
Transient breakdown and can not work normally, even more influence load service performance.
Utility model content
The one kind designed purpose of the utility model is to solve the deficiency of above-mentioned technology prevents power supply output short-circuit
Overcurrent output, and power supply exports a kind of high frequency transformer of reliable and stable frequency conversion type Switching Power Supply.
It include a kind of high frequency transformer of frequency conversion type Switching Power Supply, flow-limiting voltage-stabilizing module, PWM designed by the utility model
Control module, power conversion modules, feedback module, anti-interference high frequency transformer, filter module, Voltage stabilizing module and current limliting module；
Anti-interference high frequency transformer includes the magnetic ferrite magnetic core, skeleton and the stitch positioned at skeleton bottom of E font shape, soft magnet oxygen
Body magnetic core is fixed on skeleton, and the mid-wrap of magnetic ferrite magnetic core has armature winding, is wound on the outside of armature winding absolutely
Edge pads, and is wound with secondary windings on the outside of insulating cell, winds adhesive tape, armature winding and/secondary in the outside of secondary windings
Copper foil open circuit band is equipped between the coil of winding；Flow-limiting voltage-stabilizing module is connected with PWM control module, PWM control module and function
Rate conversion module be connected, power conversion modules are connected with anti-interference high frequency transformer, feedback module be connected to PWM control module and
Between the secondary windings of anti-interference high frequency transformer, filter module is connected with Voltage stabilizing module, and Voltage stabilizing module is connected with current limliting module.
Further preferably, flow-limiting voltage-stabilizing module include rectifier diode, bi-directional voltage stabilizing diode, PNP triode, resistance and
PMOS tube；The anode of rectifier diode is connected with the input terminal of current-limiting protection circuit, the anode of cathode and bi-directional voltage stabilizing diode
It is connected, the cathode of bi-directional voltage stabilizing diode is connected with the output end of current-limiting protection circuit；PNP triode penetrates grade and rectification two
The cathode of pole pipe is connected, and collector is connected with the grid of PMOS tube, and base stage is connected with the drain electrode of PMOS tube, the source electrode and limit of PMOS tube
The output end of stream protection circuit is connected；The both ends of resistance are connected with the drain electrode of the emitter-base bandgap grading of PNP triode and PMOS tube respectively.
Further preferably, power conversion modules include metal-oxide-semiconductor, resistance R52, resistance R51, resistance R41, resistance R40 and two
Pole pipe D3；The grid of metal-oxide-semiconductor is connected to the cathode of DC bus by a resistance R52, and source electrode is connected with PWM control unit, source
Pole is connected to the cathode of bus by resistance R51, drains by being sequentially connected in series rectifier diode D3, resistance R41 and resistance R40
To the cathode of bus.
Further preferably, PWM control module includes a chip UC3844A, and the 6th pin is pwm signal output pin, the
Six pins are connected to the grid of mos pipe by five R49 of a resistance, and third pin is connected to the source of mos pipe by six R50 of resistance
Pole is connected with resistance R47 between the 8th pin and the 4th pin, capacitor C28 is connected between the 4th pin and bus cathode, electricity
Resistance R47 and capacitor C28 determines the duty ratio of the PWM waveform exported on the 6th pin, and then influences anti-interference high frequency transformer
Secondary voltage, the first pin and second pin are connected on the stitch of anti-interference high frequency transformer by feedback unit 4.
Further preferably, feedback module 4 includes rectifier diode D4, rectifier diode D5, capacitor C27, resistance R44, electricity
Hinder R48 and resistance R45, the alternating current that rectifier diode D4, rectifier diode D5 export anti-interference high frequency transformer stitch
Be made into direct current, the anode of rectifier diode D5 connects the stitch of anti-interference high frequency transformer, the cathode of rectifier diode D5 with
The anode of rectifier diode D4 is connected, and the cathode of rectifier diode D4 is connected on the 7th pin of chip UC3844A, resistance R44
One end be connected between rectifier diode D4, rectifier diode D5, the other end is connected on the stitch of anti-interference high frequency transformer,
It is parallel with capacitor C39 at the both ends of resistance R44, between the cathode of rectifier diode D4 and the stitch of anti-interference high frequency transformer
Also it is parallel with voltage-stabiliser tube ZD1, capacitor C38 and capacitor C30；Resistance R46, capacitor C27, resistance R48 and resistance R45 are by transformation
On Voltage Feedback to the first pin and second pin of chip UC3844A after device rectification.
Further preferably, filter module is made of filter inductance L2, capacitor C11, C12, C13.
Further preferably, Voltage stabilizing module includes the electricity of difference amplifier EA, power transmission PMOS tube P1 and output voltage
Feedback network R1 and R2 are hindered, the negative input of difference amplifier EA connects reference voltage VREF, the grid connection of PMOS tube P1
The output end of difference amplifier EA, the source electrode of PMOS tube P1 connect power vd D with substrate, and the drain electrode of PMOS tube P1 connects resistance R1
One end and the other end connection resistance R2 of output end OUT as Voltagre regulator, resistance R1 one end and difference amplifier
The positive input of EA, the other end ground connection of resistance R2.
Further preferably, current limliting module, including PMOS tube P2, P3, P4, NMOS tube N1 and resistance R3 and R4, PMOS tube
The source electrode and substrate of P2, P3, P4 all connect power vd D, difference amplifier EA in the grid connection Voltagre regulator of PMOS tube P2
Output end, PMOS tube P2 drain electrode connection resistance R3 one end, the resistance R3 other end connect resistance R4 one end and NMOS tube
The grid of N1, the other end ground connection of resistance R4, the output end OUT, NMOS tube N1 of the source electrode connection Voltagre regulator of NMOS tube N1
Drain electrode connection PMOS tube P3 drain and gate and link together with the grid of PMOS tube P4, the substrate of NMOS tube N1 connects
Ground, the drain electrode of PMOS tube P4 connect the output end of difference amplifier EA in Voltagre regulator.
A kind of high frequency transformer of frequency conversion type Switching Power Supply, defeated through the utility model transformer designed by the utility model
Power good out is reliable, and power factor (PF) is high, strong without harmonic wave interference, reactance voltage impact；Make under the action of FM circuit
Protection load is not damaged.Realize that limitation exported by providing the current limit circuit comprising nonlinear device simultaneously
Stream, is quadratic relationship between the electric current and voltage of the nonlinear device, in this way, a slight change of voltage will lead to electric current
One big variation.Short circuit current can be decreased below to maximum limitation electric current.In such devices, when output electric current is greater than
When maximum limitation electric current, output voltage and electric current are simultaneously declined.Advantage is can not only to reduce pressure stabilizing and current limliting module in short circuit
Power consumption, load device can also be protected from the influence of overcurrent.
Detailed description of the invention
Fig. 1 is the overall structure diagram of embodiment 1；
Fig. 2 is the flow-limiting voltage-stabilizing modular structure schematic diagram of embodiment 1
Fig. 3 is the integral module structural schematic diagram of the frequency modulation of embodiment 1；
Fig. 4 is the anti-interference high-frequency transformer structure schematic diagram of embodiment 1；
Fig. 5 is the Transformer core structure schematic diagram of embodiment 1；
Fig. 6 is the filtering modular structure schematic diagram of embodiment 1；
Fig. 7 is the pressure stabilizing of embodiment 1 and the structural schematic diagram of current limliting module.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art's every other embodiment obtained, all belongs to
In the range of the utility model protection.
Embodiment 1:
As shown in Fig. 1-Fig. 7, a kind of high frequency transformer of frequency conversion type Switching Power Supply, flow-limiting voltage-stabilizing described in the present embodiment
Module 1, PWM control module 2, power conversion modules 3, feedback module 5, anti-interference high frequency transformer 4, filter module 6, pressure stabilizing mould
Block 7 and current limliting module 8；The magnetic ferrite magnetic core 43 of anti-interference high frequency transformer 4 including E font shape, skeleton 41 and it is located at bone
The stitch 42 of 41 bottom of frame, magnetic ferrite magnetic core 43 are fixed on skeleton 41, and the mid-wrap of magnetic ferrite magnetic core 43 has
Armature winding 44, the outside of armature winding 44 are wound with insulating cell 46, and the outside of insulating cell 46 is wound with secondary windings 47,
Adhesive tape is wound in the outside of secondary windings 47, copper foil open circuit band is equipped between armature winding 44 and the coil of/secondary windings 47
47；Flow-limiting voltage-stabilizing module 1 is connected with PWM control module 2, and PWM control module 2 is connected with power conversion modules 3, power conversion mould
Block 3 is connected with anti-interference high frequency transformer 4, and feedback module 5 is connected to PWM control module 2 and anti-interference high frequency transformer 4
Between secondary windings, anti-interference high frequency transformer 4 and reactive compensation capacitor are connected with filter module, filter module and pressure stabilizing mould
Block is connected, and Voltage stabilizing module is connected with current limliting module.
The design principle of above structure: on the input circuit of transformer, using flow-limiting voltage-stabilizing module by original low frequency energy
(50HZ or less) transmission mode is converted into high-frequency energy (1KHZ) transmission, to reduce the energy consumption of transformer entirety, improves electric energy
Transformation efficiency, power conversion modules tentatively convert voltage, and PWM control module will generate pwm signal and driving power transformation is single
Member work, anti-interference high frequency transformer further convert voltage, realize under transformer action without harmonic wave interference, reactance voltage
The strong function of impact is more preferably further converted voltage to realize, feedback unit is electric by transformer secondary output winding
Pressure feeds back to PWM control unit, then will be filtered in the power input to filter module of further transformation, filters
Pressure stabilizing is carried out through Voltage stabilizing module after processing completion, current limliting is carried out after the completion of pressure stabilizing and exports electric current；Simultaneously using the change of high frequency conveying
Depressor has advantages such as small in size, light-weight (volume and weight can reduce 60%) in shape design aspect.The output of transformer
Pressure stabilizing and current limliting module (maximum allowed current 2A) are accessed on circuit, keep the output of voltage in power circuit, electric current more stable,
Meet GB3836.4 to the regulation of power supply intrinsic safety requirement, enhances the explosion-proof performance of power supply；Wherein, open circuit band both with anti-interference height
The magnetic core of frequency power transformer connects, and can connect with the ground of Switching Power Supply, can play the role of good electrostatic screen.Moreover, open circuit
The area of section of band is not less than 6cm2, and the thickness for band of opening a way is greater than 1mm.The magnetic resistance and its area of section of open circuit band are in line
Sexual intercourse, magnetic resistance characterize material to by the obstruction characteristic of magnetic flux, magnetic resistance is defined as: bis- L/ team of R, L are magnetic flux path length
(cm), (cm spoons, mouth is magnetic conductivity to A area of section, and mouth two B/H, H are magnetic field strength, and B is magnetic flux density.From the foregoing, it will be observed that height
Frequency voltage device, the magnetic permeability of shielding material is higher, thicker, and area of section is bigger, then shield effectiveness is higher；Pass through insulating cell 46
The capacitance that distribution capacity between armature winding 44 and secondary windings 47 can be reduced is conducive to reduce switched power output
Common mode harassing and wrecking: while the dielectric strength between armature winding 102 and secondary windings 103 is also increased, meet wanting for insulation pressure resistance
It asks.
In the present embodiment, the magnetic ferrite magnetic core 43 of E font shape reduces transformer to reduce the iron loss of transformer
Energy loss；Reasonable method is used simultaneously, reduces the resistance (resistance can reduce by 50%) of first and second winding, reduces transformer
Copper loss；To further decrease transformer energy consumption.
In the present embodiment, flow-limiting voltage-stabilizing module 1 includes rectifier diode D35, tri- pole bi-directional voltage stabilizing diode D36, PNP
Pipe Q4, resistance R31 and PMOS tube Q5；Rectifier diode D35 anode be connected with the input terminal of current-limiting protection circuit, cathode with pair
It is connected to the anode of zener diode D36, the cathode of bi-directional voltage stabilizing diode D36 is connected with the output end of current-limiting protection circuit；
The emitter-base bandgap grading of PNP triode Q4 is connected with the cathode of rectifier diode D35, and collector is connected with the grid of PMOS tube Q5, base stage with
The drain electrode of PMOS tube Q5 is connected, and the source electrode of PMOS tube Q5 is connected with the output end of current-limiting protection circuit；The both ends of resistance R31 point
It is not connected with the drain electrode of the emitter-base bandgap grading of PNP triode Q4 and PMOS tube Q5.The model of rectifier diode D35 uses 1N4007, PNP
The model of triode uses 9012；Its structure rectifying diode and bi-directional voltage stabilizing diode are for preventing power positive cathode reversal connection pair
Circuit damages.The resistance to counter-pressure-ing characteristic of rectifier diode lN4007 is for preventing injury caused by reversal connection, two pole of bi-directional voltage stabilizing
Pipe is for keeping the stabilization of bi-directional voltage.
In foregoing circuit structure, when the voltage of the base stage of PNP diode to emitter-base bandgap grading is more than conducting voltage, PNP triode
Conducting: when the voltage of the base root of NP triode to emitter-base bandgap grading is less than conducting voltage, PNP triode is disconnected.Therefore, the electricity in circuit
Stream upper limit value be defined as the base stage of PNP triode to emitter-base bandgap grading conducting voltage and PNP triode base stage to emitter-base bandgap grading resistance value
The ratio between.By choosing resistance value of the base stage of different PNP triodes to emitter-base bandgap grading, i.e., settable different current upper limit value.Work as electricity
Entire circuit can be disconnected automatically after upper limit value of the electric current more than setting in road, to realize current-limiting protection.
When the grid voltage of PMOS tube is low level, PMOS tube conducting: when the grid voltage of PMOS tube is high level,
PMOS tube disconnects.
When current value is less than the upper limit value of setting in circuit, PNP triode is disconnected, and electric current does not pass through PNP triode
And flow directly into PMOS tube and export again: when current value is more than the upper limit value of setting in circuit, PNP triode ON, electric current leads to
Cross PNP triode, and PMOS tube due to grid voltage be high level and disconnect so that entire circuit disconnects, reach
The current-limiting protection effect of entire circuit.
More preferable flow-limiting voltage-stabilizing is just carried out before entering transformer in electric current in conclusion realizing, while passing through setting rectification
Diode prevents the power positive cathode to be reversely connected；The upper limit value of electric current is set by using different PNP triodes, when in circuit
Electric current be more than setting value after can disconnect automatically entire circuit: when electric current be more than setting value when, can stop at a high speed, and be easy to restore
Primary circuit can provide current-limiting protection for any DC circuit: it is at low cost, it is practical.
In the present embodiment, power conversion modules include metal-oxide-semiconductor TR2, resistance R52, resistance R51, resistance R41, resistance R40 and
Diode D3；The grid of metal-oxide-semiconductor is connected to the cathode of DC bus by a resistance R52, and source electrode is connected with PWM control unit,
Source electrode is connected to the cathode of bus by resistance R51, drains by being sequentially connected in series rectifier diode D3, resistance R41 and resistance
R40 to bus cathode.PWM control module includes a chip UC3844A, and the 6th pin is pwm signal output pin, and the 6th draws
Foot is connected to the grid of mos pipe by five R49 of a resistance, and third pin is connected to the source electrode of mos pipe by six R50 of resistance,
It is connected with resistance R47 between 8th pin and the 4th pin, capacitor C28, resistance are connected between the 4th pin and bus cathode
R47 and capacitor C28 determines the duty ratio of the PWM waveform exported on the 6th pin, and then influences anti-interference high frequency transformer
The voltage of grade, the first pin and second pin are connected on the stitch of anti-interference high frequency transformer by feedback unit 4.
Feedback module 4 includes rectifier diode D4, rectifier diode D5, capacitor C27, resistance R44, resistance R48 and electricity
R45 is hindered, the alternating current that anti-interference high frequency transformer stitch exports is made into direct current by rectifier diode D4, rectifier diode D5,
The anode of rectifier diode D5 connects the stitch of anti-interference high frequency transformer, the cathode and rectifier diode D4 of rectifier diode D5
Anode be connected, the cathode of rectifier diode D4 is connected on the 7th pin of chip UC3844A, and one end of resistance R44 is connected to
Between rectifier diode D4, rectifier diode D5, the other end is connected on the stitch of anti-interference high frequency transformer, resistance R44's
Both ends are parallel with capacitor C39, are also parallel between the cathode of rectifier diode D4 and the stitch of anti-interference high frequency transformer steady
Pressure pipe ZD1, capacitor C38 and capacitor C30；After resistance R46, capacitor C27, resistance R48 and resistance R45 rectify transformer
On Voltage Feedback to the first pin and second pin of chip UC3844A.In above structure, the power supply of chip UC3844A i.e. by
21 pin output voltages of the self-powered winding of transformer are through diode D5, capacitor C39, diode D4, capacitor C38 rectifying and wave-filtering
It is supplied at DC voltage.After power initiation, the 8th pin output 5V reference voltage of chip UC3844A is to give the eight, the 4th feet
Between R, C oscillation timing circuit power supply, parallel connection R, C-element between the first, second foot of chip UC3844A are constituted
The feedback loop of builtin voltage error amplifier determines gain and the frequency transmission characteristic of amplifier；The of chip UC3844A
It is that PWM wave forms circuit inside six feet, oscillating impulse is exported by the 6th foot, is limited by positive inside R52 de-noising and mos pipe TR2
Width, the grid of mos pipe TR2 is added to through resistance R49, and the conducting of mos pipe TR2 forms anti-interference high frequency transformer armature winding
In electric current, self-powered winding, the secondary windings of anti-interference high frequency transformer generate induced potential immediately, and through load circuit shape
At output current path.Electric current in anti-interference high frequency transformer armature winding generates on resistance R51 current sampling resistor
Pressure drop signal, this current sampling signal are input to the third foot of chip UC3844A through resistance R50, with internal circuit reference voltage
Compare, generates control signal and rear class PWM wave is sent to form circuit.It is made quickly because current sampling signal can change main winding current
Reaction, makes integrated circuit have preferable current control performance, and in overcurrent lesser extent, the closed-loop control of electric current makes output electricity
Stream reduces, and when overcurrent degree is heavier, makes Switching Power Supply failure of oscillation, protects the safety of switching tube and successive load circuit.
In the present embodiment, filter module is made of filter inductance L2, capacitor C11, C12, C13.Its filter module is done with anti-
The secondary coil for disturbing high frequency transformer is connected.
In the present embodiment, pressure stabilizing and current limliting module composition pressure stabilizing current limliting module, including difference amplifier EA, power transmission pipe
The resistance-feedback network R1 and R2 of P1 and output voltage.Wherein the input terminal of difference amplifier EA is divided into positive input and anti-
To input, be respectively labeled as+and-, wherein positive input connects the connecting pin of R1 and R2, and negative input connects reference voltage
VREF.The output of difference amplifier EA connects the grid of power transmission pipe P1.The one of the drain electrode connecting resistance R1 of power transmission pipe P1
End, and output voltage OUT is provided, power transmission pipe P1 source electrode and substrate are connected to VDD together.The other end of resistance R1 connects resistance
One end of R2 and the positive input of difference amplifier EA, the other end ground connection of resistance R2.Its working principle is that OUT voltage is logical
The positive input that resistance-feedback network R1 and R2 are output to difference amplifier EA is crossed, is compared with reference voltage VREF, EA
Output signal control OUT keep stablize.When OUT decline, the forward end voltage decline of EA causes to be less than VREF, EA output
Voltage decline, control P1 grid potential decline, to promote P1 drain terminal voltage, i.e. OUT rises.Vice versa.
The part PART2 is current-limiting circuit, is connected in the output of the part PART1, P2, P3, P4 including PMOS tube,
The N1 and resistor network R3 and R4 of NMOS tube.The source electrode and substrate of wherein P2, P3, P4 are all connected to VDD, and the grid of P2 is connected to difference
Divide the output of amplifier EA, the drain electrode of P2 is connected to the one end resistance R3, and resistance R3 is another to be connected to the one end resistance R4, and is connected to N1's
Grid, the other end ground connection of resistance R4.The source electrode of N1 is connected to OUT, and the drain electrode of N1 is connected to the drain electrode of P3, and the drain electrode of P3 and
Its grid links together while connecting the grid of P4, the Substrate ground of N1, and the drain electrode of P4 is connected to the company of EA output and P1 grid
Contact.Its working principle is that P2 is exported on electric current to resistor network R3 and R4 by image load electric current, the partial pressure of R4 is N1
Grid provides operating voltage.As VG (N1)-VS (N1) < VTH (N1), VG (N1) is the grid potential of N1, and VS (N1) is N1
Source potential, VTH (N1) is the threshold value of N1, then N1 is in close state, while the P3 of series connection with it manages no electric current, P3 pipe
Mirror image pipe P4 also without electric current, therefore foldback current limit circuit does not influence the normal work of the traditional linear voltage regulator of PART1.
As VG (N1)-VS (N1) > VTH (N1), then N1 is in the open state, NMOS tube saturation conduction electric current meets:
(under the conditions of VDS > VGS-VTH) μ n is the mobility of electronic carrier, and COX is the gate oxide capacitance of unit area, and W/L is
The breadth length ratio of efferent duct, VGS are that the gate source voltage of NMOS tube is poor, and VTH is NMOS tube threshold value.P3 and P4 also has electric current stream simultaneously
It crosses, the electric current of P4 draws high the output end voltage of EA upwards, to improve P1 grid potential, plays the work for reducing P1 driving capability
With reducing and flow through the driving current of P1.Under limiting case, when the pull-up current ability of P4 is much larger than the pull-down current ability of EA
When, the grid potential of P1 can be pulled to VDD, to completely close P1 pipe, i.e., without output electric current.Utilize P2 size, R3 and R4
The size of suitable N1 grid potential, P3 and P4 is arranged to adjust the pull-up current ability of P4, then when there is OUT in resistance value
When=0, N1 can be connected at once, drive P3 and P4 conducting, and draw short circuit current by high current by P4 pull-up current and draw rapidly
It is low, it is limited in a smaller range, finally settles out, realize that short circuit current is turned back function, play the role of protection.
The utility model is not limited to above-mentioned preferred forms, anyone can obtain under the enlightenment of the utility model
Other various forms of products, however, make any variation in its shape or structure, it is all that there is same as the present application or phase
Approximate technical solution, all falls within the protection scope of the utility model.
Claims (8)
1. a kind of high frequency transformer of frequency conversion type Switching Power Supply, which is characterized in that including flow-limiting voltage-stabilizing module, PWM control module,
Power conversion modules, feedback module, anti-interference high frequency transformer, filter module, Voltage stabilizing module and current limliting module；Anti-interference high frequency
Transformer includes that the magnetic ferrite magnetic core, skeleton and the stitch positioned at skeleton bottom, magnetic ferrite magnetic core of E font shape are fixed
In on skeleton, the mid-wrap of magnetic ferrite magnetic core has armature winding, and insulating cell is wound on the outside of armature winding, insulation
Be wound with secondary windings on the outside of liner, wind adhesive tape in the outside of secondary windings, armature winding and the/coil of secondary windings it
Between be equipped with copper foil open a way band；Flow-limiting voltage-stabilizing module is connected with PWM control module, PWM control module and power conversion modules phase
Even, power conversion modules are connected with anti-interference high frequency transformer, and feedback module is connected to PWM control module and anti-interference high frequency becomes
Between the secondary windings of depressor, filter module is connected with Voltage stabilizing module, and Voltage stabilizing module is connected with current limliting module.
2. a kind of high frequency transformer of frequency conversion type Switching Power Supply according to claim 1, which is characterized in that flow-limiting voltage-stabilizing mould
Block includes rectifier diode, bi-directional voltage stabilizing diode, PNP triode, resistance and PMOS tube；The anode and current limliting of rectifier diode
The input terminal of circuit is protected to be connected, cathode is connected with the anode of bi-directional voltage stabilizing diode, the cathode and limit of bi-directional voltage stabilizing diode
The output end of stream protection circuit is connected；The grade of penetrating of PNP triode is connected with the cathode of rectifier diode, the grid of collector and PMOS tube
Extremely it is connected, base stage is connected with the drain electrode of PMOS tube, and the source electrode of PMOS tube is connected with the output end of current-limiting protection circuit；The two of resistance
End is connected with the drain electrode of the emitter-base bandgap grading of PNP triode and PMOS tube respectively.
3. a kind of high frequency transformer of frequency conversion type Switching Power Supply according to claim 1, which is characterized in that power conversion mould
Block includes metal-oxide-semiconductor, resistance R52, resistance R51, resistance R41, resistance R40 and diode D3；The grid of metal-oxide-semiconductor passes through a resistance
R52 is connected to the cathode of DC bus, and source electrode is connected with PWM control unit, and source electrode is connected to the negative of bus by resistance R51
Pole, the cathode to drain by being sequentially connected in series rectifier diode D3, resistance R41 and resistance R40 to bus.
4. a kind of high frequency transformer of frequency conversion type Switching Power Supply according to claim 1, which is characterized in that PWM controls mould
Block includes a chip UC3844A, and the 6th pin is pwm signal output pin, and the 6th pin is connected to by five R49 of a resistance
The grid of mos pipe, third pin are connected to the source electrode of mos pipe by six R50 of resistance, connected between the 8th pin and the 4th pin
It is connected to resistance R47, capacitor C28, resistance R47 and capacitor C28 are connected between the 4th pin and bus cathode and determines that the 6th draws
The duty ratio of the PWM waveform exported on foot, and then the voltage of anti-interference high frequency transformer secondary is influenced, the first pin and second draws
Foot is connected on the stitch of anti-interference high frequency transformer by feedback unit.
5. a kind of high frequency transformer of frequency conversion type Switching Power Supply according to claim 1, which is characterized in that feedback module packet
Include rectifier diode D4, rectifier diode D5, capacitor C27, resistance R44, resistance R48 and resistance R45, rectifier diode D4,
The alternating current that anti-interference high frequency transformer stitch exports is made into direct current by rectifier diode D5, and the anode of rectifier diode D5 connects
The stitch of anti-interference high frequency transformer is connect, the cathode of rectifier diode D5 is connected with the anode of rectifier diode D4, rectifies two poles
The cathode of pipe D4 is connected on the 7th pin of chip UC3844A, and one end of resistance R44 is connected to rectifier diode D4, rectification two
Between pole pipe D5, the other end is connected on the stitch of anti-interference high frequency transformer, is parallel with capacitor C39 at the both ends of resistance R44,
Voltage-stabiliser tube ZD1, capacitor C38 and electricity are also parallel between the cathode of rectifier diode D4 and the stitch of anti-interference high frequency transformer
Hold C30；Resistance R46, capacitor C27, resistance R48 and resistance R45 transformer is rectified after Voltage Feedback to chip UC3844A
The first pin and second pin on.
6. a kind of high frequency transformer of frequency conversion type Switching Power Supply according to claim 1, which is characterized in that filter module by
Filter inductance L2, capacitor C11, C12, C13 composition.
7. a kind of high frequency transformer of frequency conversion type Switching Power Supply according to claim 1, which is characterized in that Voltage stabilizing module packet
Include the resistance-feedback network R1 and R2 of difference amplifier EA, power transmission PMOS tube P1 and output voltage, difference amplifier EA
Negative input connect reference voltage VREF, PMOS tube P1 grid connection difference amplifier EA output end, PMOS tube P1
Source electrode connect power vd D with substrate, one end of the drain electrode connection resistance R1 of PMOS tube P1 and the output as Voltagre regulator
Hold OUT, one end of the other end connection resistance R2 of resistance R1 and the positive input of difference amplifier EA, the other end of resistance R2
Ground connection.
8. a kind of high frequency transformer of frequency conversion type Switching Power Supply according to claim 7, which is characterized in that current limliting module,
Including PMOS tube P2, P3, P4, NMOS tube N1 and resistance R3 and R4, the source electrode and substrate of PMOS tube P2, P3, P4 all connect electricity
The output end of difference amplifier EA, the drain electrode of PMOS tube P2 connect electricity in the grid connection Voltagre regulator of source VDD, PMOS tube P2
One end of R3 is hindered, the resistance R3 other end connects one end of resistance R4 and the grid of NMOS tube N1, and the other end of resistance R4 is grounded,
The drain electrode of the drain electrode connection PMOS tube P3 of the output end OUT of the source electrode connection Voltagre regulator of NMOS tube N1, NMOS tube N1 and grid
Pole simultaneously links together with the grid of PMOS tube P4, the Substrate ground of NMOS tube N1, and the drain electrode of PMOS tube P4 connects voltage pressure stabilizing
The output end of difference amplifier EA in device.
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| CN201821014140.4U CN208539789U (en) | 2018-06-28 | 2018-06-28 | A kind of high frequency transformer of frequency conversion type Switching Power Supply |
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| CN201821014140.4U CN208539789U (en) | 2018-06-28 | 2018-06-28 | A kind of high frequency transformer of frequency conversion type Switching Power Supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109741921A (en) * | 2019-03-21 | 2019-05-10 | 东莞市铭汉电子有限公司 | A kind of winding structure inhibiting electromagnetic interference high frequency transformer |
| CN112558676A (en) * | 2019-09-25 | 2021-03-26 | 半导体元件工业有限责任公司 | Voltage stabilizer circuit |
-
2018
- 2018-06-28 CN CN201821014140.4U patent/CN208539789U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109741921A (en) * | 2019-03-21 | 2019-05-10 | 东莞市铭汉电子有限公司 | A kind of winding structure inhibiting electromagnetic interference high frequency transformer |
| CN112558676A (en) * | 2019-09-25 | 2021-03-26 | 半导体元件工业有限责任公司 | Voltage stabilizer circuit |
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Granted publication date: 20190222 Termination date: 20200628 |