CN208862763U - Simulating diode based on power field effect pipe - Google Patents
Simulating diode based on power field effect pipe Download PDFInfo
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- CN208862763U CN208862763U CN201821521071.6U CN201821521071U CN208862763U CN 208862763 U CN208862763 U CN 208862763U CN 201821521071 U CN201821521071 U CN 201821521071U CN 208862763 U CN208862763 U CN 208862763U
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- 230000005669 field effect Effects 0.000 title claims abstract description 67
- 239000003990 capacitor Substances 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model provides a kind of simulating diode based on power field effect pipe, which compares driving circuit by power field effect pipe, voltage and power circuit three parts are constituted, and power field effect pipe is in reverse conduction mode；Voltage compares driving circuit and constitutes hysteresis voltage comparator circuit by the voltage comparable chip or operational amplifier of high speed rail to rail input and output, directly drives power field effect pipe；The operating voltage that voltage compares driving circuit is derived from the backward voltage of rectifying tube, is provided with current-limiting resistance, rectifier diode, storage capacitor, zener diode.Its usefulness of the utility model is, relative to general-purpose diode rectification circuit, rectification efficiency can be improved 8%-12% in the working environment of low-voltage and high-current.
Description
Technical field
The utility model belongs to electronic technology field based on the content that the simulating diode of power field effect pipe is related to, and is used for
The ac-dc conversion of power frequency AC.
Background technique
The effect of rectification circuit is that alternating voltage is converted into DC voltage, generallys use the all-wave of two diodes composition
The bridge rectifier of rectification circuit and four diodes composition.But in low-voltage and high-current switching process, rectifier diode
Voltage drop cannot be ignored, tube voltage drop can generally reach 1.0V~2.0V, and power loss caused by rectifier diode is occupied
Biggish ratio generally reaches the 10%-20% of general power.Therefore, diode bridge rectifier circuit exists under low voltage environment
Ineffective disadvantage, the effective use for electric energy are a big damages.
In order to reduce the power loss of rectification circuit, rectification work is undertaken using power field effect pipe substitution diode at present
Make.The conducting internal resistance very little of low Breakdown Voltage Power field-effect tube even flows through 10A electric current usually above or below 10m Ω, produced
Voltage drop be also far below the voltage drop of general-purpose diode, thus greatly reduce the power loss of rectifying device itself.But two
Pole pipe is simple one way conducting device, without external control；And field-effect tube is controlled device, it is necessary to according to the need of switching
Synchronize control.In order to enable field-effect tube reaches the target of one-way conduction, industry is proposed based on power field effect pipe
Circuit of synchronous rectification, be reference with protection diode inside power field effect pipe, when applying positive direction in field-effect tube
It is synchronous when applying the voltage of opposite direction in field-effect tube by addition locking control voltage opens field-effect tube all the way when voltage
Control voltage closes field-effect tube.Circuit of synchronous rectification is basically used in high-frequency switch circuit at present, using doublewound complete
Wave synchronous rectification structure, as shown in Fig. 4.It is not solid because of input voltage amplitude consecutive variations in low-frequency sinusoidal AC environment
The switch instant of fixed Push And Release, it is not easy to synchronization signal is obtained, it is basic without using synchronous rectification mode, generally use classics
Diode rectifier circuit.
It is unilateal conduction that power field effect pipe substitution diode, which undertakes the basic demand of rectification work, i.e., with power field effect
Protection diode inside pipe is reference, and both ends are connected when applying the voltage of positive direction, and both ends are closed when applying opposite direction voltage.
Under low speed environments, as long as the voltage difference between detection field-effect tube source and drain the two poles of the earth, the grid of rapid feedback to field-effect tube are complete
At the adjustment of through and off, does not need external synchronization signal and participate in control.This control may be implemented in electronic technology completely
Target processed.Apply for the high efficiency full bridge rectifier patent based on power field effect pipe before, and constitutes the roman of full-bridge rectification
Module, the utility model devise a simulating diode module based on power field effect pipe, constitute single module diode
Standalone module, high efficiency full-wave rectification can be realized in low-frequency sinusoidal AC electrical environment.
Summary of the invention
The purpose of the utility model is to provide a kind of modules of low conducting voltage for being directed to low-frequency sinusoidal AC electric rectification
Diode circuit has the feature that from technological layer
Simulating diode circuit based on power field effect pipe compares driving circuit and power supply by power field effect pipe, voltage
Circuit three parts are constituted, and power field effect pipe connects direction according to power field effect pipe internal protection diode and common rectifier bridge
Middle diode polarity is unanimously standard, i.e., power field effect pipe is in reverse conduction mode, as shown in Fig. 1；Voltage compares drive
The voltage comparable chip or rail-to-rail input/output operation amplifier that dynamic circuit is exported by high speed rail to rail constitute hysteresis voltage ratio
Compared with circuit, power field effect pipe is directly driven, the source negative terminal of voltage comparator, the source electrode of field-effect tube Q1, Q2 are interconnected to
Collinear structure；The operating voltage that voltage compares driving circuit is derived from the backward voltage of rectifying tube, is provided with current-limiting resistance R1, rectification
Diode D1, storage capacitor C1, zener diode D2.
The simulating diode based on power field effect pipe is laid out in plane mounting structure, two field-effect tube Q1, Q2
It is in parallel on circuit structure, it is placed in same plane in space layout.
The simulating diode based on power field effect pipe is passive two end module, self-supporting in switching process
Electricity.
Simulating diode compared to general-purpose diode in rectification circuit caused by the utility model has the advantages that
In the working environment of low-voltage and high-current, relative to general-purpose diode rectification circuit, simulating diode can be incited somebody to action
Rectification efficiency improves 8%-12%.
The voltage compares in driving circuit, relatively determines the polarity of voltage at field-effect tube both ends, by resistance R3 by field
Effect pipe drain potential is transferred to the inverting input terminal of voltage comparator, when the voltage for being input to field-effect tube is drain electrode high source
When low, reverse phase terminal potential is higher than in-phase end, and voltage comparator exports low potential, and the gate source voltage of field-effect tube is close to 0V, power
Field-effect tube is closed；On the contrary, passing through resistance R3, reverse side when the voltage for being input to field-effect tube is high for the low source electrode of drain electrode
Current potential is lower than in-phase end, and voltage comparator exports high potential, and the gate source voltage of field-effect tube close to 5V, opened by power field effect pipe
It is logical.The output current potential of high speed voltage comparator IC1 determines the through and off of field-effect tube, and therefore, voltage comparator should be using tool
There is the device of drawing, sink current ability.Diode D3 is used as the clamper of voltage comparator input terminal, protects voltage comparator.R6 and
R7 constitutes hysteresis voltage comparative characteristic, and R2 is used as the adjustment of critical voltage fiducial value.Resistance R1 and diode D1 is that voltage compares
The power supply circuit of circuit, the pent half period of scene effect pipe is interior to provide power supply for voltage comparator circuit；Scene effect pipe
Diode D1 no longer powers to voltage comparator circuit when opening, and is powered at this time by capacitor C1 to comparison circuit.This powering mode
It works in the meeting of simulating diode switching process is automatic.
Simulating diode based on power field effect pipe has voltage compliance characteristics similar with general energy diode, that is, applies
Adding when reverse voltage, there is backward voltage ability is automatically closed, and has when applying forward voltage and quickly opens ability, and by field
Internal resistance is connected in effect pipe and conducting electric current determines voltage drop size, and general electric conduction pressure drop is very low.
Simulating diode circuit has higher polarity of voltage discrimination threshold.Due to voltage comparator circuit operating voltage about
For 5V, operating voltage is lower, it is necessary to the field-effect tube of low turning-on voltage be cooperated such as to use NTD50N03, AON6504, AOD260
Field-effect tube, their cut-in voltage is down to 1.7V.
Detailed description of the invention
Attached drawing 1 is the simulating diode circuit diagram based on power field effect pipe.
The end A is exactly the anode of simulating diode in figure, and the end B is the cathode of simulating diode.
Attached drawing 2 is the Double-side line layout of the simulating diode module based on power field effect pipe.
Attached drawing 3 is the operating voltage waveform of the simulating diode inside modules voltage comparator circuit based on power field effect pipe
Curve.
Attached drawing 4 is the double winding all-wave circuit of synchronous rectification basic structure of high-frequency switch circuit.
T1 is switch transformer in figure, and input AC pulse voltage, Q1 and Q2 are rectifying tubes, and L1 is filter inductance, DCOUT
+ and DCOUT- be rectification after DC voltage two output ends, for DCOUT- as reference ground, va and vb are two with frequency pulse
Voltage.
Specific embodiment
Below with reference to the attached drawing of the utility model, the implementation of the utility model is described further.
Simulating diode based on power field effect pipe often works in current state, if using two field-effect tube
It is used in parallel more convenient to install.Power field effect pipe is its maximum heat source, needs to install additional radiator, therefore, scene effect
Pipe space layout on will be in view of installing the convenience that radiates back additional, the placement scheme of attached drawing 2 is exactly to use two TO-252
The patch field-effect tube of encapsulation is placed on same plane side by side.
Simulating diode based on power field effect pipe is generally used for 50V AC rectification below, with alternating voltage
It increases, diode drop declines relative to the accounting of input voltage, and working efficiency, which will promote ratio, to be declined.Power field effect
For the type selecting of pipe depending on the needs of voltage and current, drain-source pressure resistance should be greater than maximum input voltage, such as alternating voltage peak
In 25V or less, the field-effect tube such as NTD50N03, AON6504, AOD518 can be selected；Alternating voltage peak is in 50V or less
When, the field-effect tube such as AOD2610, IRFZ44N, IRF3205 can be selected.
Chip is controlled in the pilot sample of the utility model and uses LMV7219 high speed voltage comparator, in addition can also be adopted
With TP1561A operational amplifier chip, it is all made of SOT23-5 encapsulation, the two pin is compatible.If transported using TP1561A
Amplifier chip is calculated, the operating voltage of control circuit can be promoted to 6.0V, and power field effect pipe opens effect can be more preferable.
Module diode based on power field effect pipe is only used for the rectification of 5V or more alternating voltage.It is electric in actual use
Hinder R1Resistance value should be adjusted according to the height of rectified voltage, have one with the internal operating voltages curve upper top measured
Short time is proper states by zener diode clamper, with reference to 3 curve of attached drawing.If the AC value of rectified voltage is V1,
Resistance value can be calculated by following formula, and the unit of resistance is k Ω.
Claims (2)
1. the simulating diode based on power field effect pipe, structure feature are: circuit is compared by power field effect pipe, voltage
Driving circuit and power circuit three parts are constituted, and power field effect pipe connects direction according to two pole of power field effect pipe internal protection
Pipe is consistent with diode polarity in common rectifier bridge, i.e., power field effect pipe is in reverse conduction mode；Voltage compares driving electricity
It is more electric that the voltage comparable chip or rail-to-rail input/output operation amplifier for routing high speed rail to rail output constitute hysteresis voltage
Road, directly drives power field effect pipe, and the source negative terminal of voltage comparator, the source electrode of field-effect tube Q1, Q2 are interconnected to collinearly
Structure；The operating voltage that voltage compares driving circuit is derived from the backward voltage of rectifying tube, is provided with current-limiting resistance R1, two poles of rectification
Pipe D1, storage capacitor C1, zener diode D2.
2. the simulating diode according to claim 1 based on power field effect pipe, it is characterized in that: being laid out in plane attachment
Structure, two field-effect tube Q1, Q2 are in parallel on circuit structure, are placed in same plane in space layout.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821521071.6U CN208862763U (en) | 2018-09-07 | 2018-09-07 | Simulating diode based on power field effect pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821521071.6U CN208862763U (en) | 2018-09-07 | 2018-09-07 | Simulating diode based on power field effect pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208862763U true CN208862763U (en) | 2019-05-14 |
Family
ID=66418188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821521071.6U Expired - Fee Related CN208862763U (en) | 2018-09-07 | 2018-09-07 | Simulating diode based on power field effect pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208862763U (en) |
-
2018
- 2018-09-07 CN CN201821521071.6U patent/CN208862763U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190514 Termination date: 20200907 |
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| CF01 | Termination of patent right due to non-payment of annual fee |