CN109586579A - A kind of 1000V output is without optocoupler isolated form DC-DC power source circuit - Google Patents
A kind of 1000V output is without optocoupler isolated form DC-DC power source circuit Download PDFInfo
- Publication number
- CN109586579A CN109586579A CN201811495153.2A CN201811495153A CN109586579A CN 109586579 A CN109586579 A CN 109586579A CN 201811495153 A CN201811495153 A CN 201811495153A CN 109586579 A CN109586579 A CN 109586579A
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- Prior art keywords
- voltage
- output
- inverse
- excitation type
- power source
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of 1000V outputs without light-coupled isolation inverse-excitation type DC-DC power source circuit, and system includes dedicated DC-DC Switching Power Supply control chip LT8304-1, inverse-excitation type isolation transformer module T1, rectifier diode, filter capacitor and voltage output control module.The inverse-excitation type isolating transformer includes a primary side winding and three independent vice-side windings, primary side winding and vice-side winding electrical isolation, and primary and secondary side umber of turn ratio is 1:10:10:10.The power supply electricity improves Load Regulation ability in the case where not needing external load compensating element, output current capacity is improved with the increase of input voltage, by directly sampling from primary side inverse-excitation type waveform to isolation output voltage, output divider and optoisolator are not needed；With temperature compensation function, rectifier diode can compensate for because of variation of ambient temperature bring output error；Meet the application of high pressure, isolation, wide temperature and small size, power supply can provide brilliant voltage regulation performance with the variation of load, voltage and temperature.
Description
Technical field
The present invention relates to field of switch power, and in particular to a kind of 1000V output is electric without optocoupler isolated form DC-DC power source
Road.
Background technique
Existing isolated form high pressure DC-DC power source uses voltage-type pulse width modulator, and pressure stabilizing feedback control loop uses transformer, light
Electric coupler and auxiliary circuit carry out sampling to output voltage and feed back error signal to primary controller；This voltage-type every
From high pressure DC-DC module, there are some problems: DC-DC module voltage regulation factor, load regulation and output efficiency are relatively low, transformation
The additional element such as device and optocoupler increases cost, physical size and the reliability for reducing module of power supply；Rectifier diode is by work
Making variation of ambient temperature influences high pressure DC-DC module output accuracy.
Summary of the invention
The purpose of the present invention is to provide a kind of 1000V outputs without optocoupler isolated form DC-DC power source circuit, improves isolated form
High pressure DC-DC module dynamic property reduces circuit cost and compressor circuit volume.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of 1000V output is without optocoupler isolated form DC-DC power source circuit, comprising: dedicated DC-DC Switching Power Supply controls core
Piece, inverse-excitation type isolating transformer, rectifier diode, filter capacitor and voltage output control module；Transformation is isolated in the inverse-excitation type
Device include a primary side winding and three independent vice-side windings, primary side winding and vice-side winding electrical isolation, primary and secondary side around
Group turn ratio is 1:10:10:10；Voltage output control module is made of NMOS tube and driving circuit；The inverse-excitation type isolation becomes
Depressor primary side winding one end and DC-DC power source input positive VIN and connects, the inverse-excitation type isolating transformer primary side winding other end and
The dedicated DC-DC Switching Power Supply controls 5 foot SW connection of chip, one end of three vice-side windings of inverse-excitation type isolating transformer
Connect respectively with three rectifier diode anodes, the other end of two of them vice-side winding respectively with two of them rectifier diode
Negative terminal connection, third rectifier diode negative terminal are connect with the end voltage output control module NMOS tube M5D.
The dedicated DC-DC Switching Power Supply control chip has input voltage under-voltage protection circuit module, by being serially connected in power supply
Input VINAnd two resistance R between direct current groundEN1And REN2Under-voltage protection voltage value is set, when
When, under-voltage protecting circuit work, dedicated DC-DC Switching Power Supply control chip interior PMOS tube M1 is turned off, and SW is defeated without switching signal
Out, DC-DC stops working.
The dedicated DC-DC Switching Power Supply control chip has output voltage adjustment module, two outsides of output voltage
Resistance RF and RREFProgramming, passes through RF and RREFAdjust the output voltage of DC-DC module.
The DC-DC module output voltage calculation formula are as follows:Wherein VREF=
1.000V, RF are feedback resistance, and NPS is that inverse-excitation type isolating transformer primary and secondary side winding pricks number ratio, and VF is rectifier diode
Forward conduction tube voltage drop.
The dedicated DC-DC Switching Power Supply control chip has primary side output electric current measure module, directly from primary side flyback
Formula waveform carries out sample detecting output voltage to isolation output voltage need not also adopt without configuring large scale high-voltage divider
Use photo-coupler.
Wherein three rectifier diodes respectively rectify the square wave of inverse-excitation type isolating transformer three secondary side outputs, and three
A filter capacitor carries out pressure stabilizing and filtering to voltage signal after diode rectification.
The wherein end D of NMOS tube M5 and rectifier diode DOUT1Negative terminal connection, the end S of NMOS tube M5 and external loading connect
It connects, DC-DC power source voltage output is controlled by the end G of M5.
Wherein LT8304-1 embedded temperature compensation module is connected to R by the resistance on TC pinREFOn pin, realize
Output rectifier diode temperature-compensating.
The present invention aims at high output voltage application and designs, and the power circuit is in the feelings for not needing external load compensating element,
Load Regulation ability is improved under condition, output current capacity is improved with the increase of input voltage, when input voltage is higher than 24V
When output electric current can reach 13mA；By directly being sampled from primary side inverse-excitation type waveform to isolation output voltage, do not need defeated
Divider and optoisolator out；With temperature compensation function, rectifier diode can compensate for because variation of ambient temperature bring exports
Error；Meet the application of high pressure, isolation, wide temperature and small size, power supply can be mentioned with the variation of load, voltage and temperature
For brilliant voltage regulation performance.
Detailed description of the invention
Fig. 1 is electrical schematic of the invention.
Specific embodiment
Below with reference to attached drawing, the invention will be further described: it is emphasized that embodiment of the present invention is
Illustrative, without being restrictive, therefore the present invention is not limited to the embodiments described in specific embodiment, all to have this
The other embodiments that field technical staff obtains according to the technique and scheme of the present invention, also belong to the scope of protection of the invention.
As shown in Figure 1, a kind of 1000V output of the present invention is without optocoupler isolated form DC-DC power source circuit, the flyback
1. formula isolating transformer T1 primary side winding is held connect with the positive VIN of DC-DC power source input, the inverse-excitation type isolating transformer T1 primary side
2. winding is held connect with the dedicated DC-DC Switching Power Supply control 5 foot of chip (SW), inverse-excitation type isolating transformer T1 pair side
Winding T1B 3., T1C 5., T1D 7. with respectively rectifier diode DOUT1、DOUT2、DOUT3Transformation is isolated in anode connection, the inverse-excitation type
4. device T1 vice-side winding T1B is held and rectifier diode DOUT26. negative terminal connection, vice-side winding T1C are held and rectifier diode DOUT3It is negative
End connection, rectifier diode DOUT1Negative terminal connection is connect with the end output control module NMOS tube M5D, the output control module
The end S of NMOS tube M5 is connect with external loading, and the opening and shutdown of the output of supply voltage are controlled by the end G of M5.
In specific implementation of the invention, dedicated DC-DC Switching Power Supply control chip uses dedicated pulse width modulating chip
LT8304-1, the integrated chip benchmark, adjuster, oscillator, logic, current amplifier, current comparator, driver and function
Rate switch, flyback pulse sensing circuit, sampling and keep error amplifier, the components such as boundary scheme detector, by directly from
Primary side inverse-excitation type waveform samples isolation output voltage, does not need output divider and optoisolator, and chip integration is high.
The pulse width modulating chip of DC-DC is done using the chip, and the cost of power supply can be greatly reduced and physical size and improves DC-DC power source
Modular system reliability.
In specific implementation of the invention, under-voltage protecting circuit implementation is as shown in Figure 1, LT8304-1 pin 1 is under-voltage
Control terminal is protected, when which is lower than 1.214V, LT8304-1 stops working.Power switch M1 output shutdown, avoids low
Pressure causes flyback transformer T1 primary side to burn, by two resistance REN1 being serially connected between power input VIN and direct current ground and
Under-voltage protection voltage value can be set in REN2, meets relational expressionWhen, under-voltage protection electricity
Road work, DC-DC output are forbidden.
In specific implementation of the invention, output voltage is configured simply by two external resistors.Such as Fig. 1 institute
Show, under conditions of not considering that temperature influences, RF and R can be passed throughREFAdjust the output voltage of DC-DC module；DC-DC module is defeated
Voltage computing formula out are as follows:Wherein VREF=1.000V, RF are that microprocessor controls number
Word potentiometer, NPS are that inverse-excitation type isolating transformer primary and secondary side winding pricks number ratio, and VF is rectifier diode forward conduction pipe pressure
Drop adjusts RF resistance value by microprocessor and realizes that output voltage is adjusted, output 0~1000V DC voltage is adjusted.
In present invention specific implementation, rectifier diode can generate an additional temperature with variation of ambient temperature at work
Voltage, environment temperature 1 DEG C of rectifier diode of every increase can generate -1mV~-2mV voltage, when rectifier diode is -40 DEG C~85
When working under DEG C temperature environment, diode can generate the voltage error of additional 200mV~300mV, LT8304-1 temperature-compensating mould
Block output voltage is directly proportional to absolute temperature (PTAT) (temperature coefficient is 3.35mV/ DEG C).TC pin voltage can be used for measuring ring
Border temperature.Resistance on the pin is connected to RREFOn pin, rectification is compensated using the temperature compensation module that LT8304-1 is embedded
Diode brings output voltage error because of operating ambient temperature variation.
In specific implementation of the invention, the dedicated DC-DC Switching Power Supply control chip has primary side output electric current measure
Module, directly the sampling isolation output voltage from primary side L1A flyback waveform.This method is not needing external load compensating element,
In the case of improve Load Regulation ability.When negative side electric current is zero, dedicated DC-DC Switching Power Supply controls chip LT8304-1 power supply
Switching tube M1 conducting, primary side current of transformer increases, when primary current increases to the peak point current pole of LT8304-1 internal control
In limited time, LT8304-1 power supply switch tube M1 is closed, and the voltage on SW pin rises to output voltage multiplied by once arriving secondary transformation
The turn ratio of device adds input voltage.It is collapsed when the secondary current by output diode drops to zero, SW pin voltage, and
It is formed into a loop around VIN.Boundary scheme detector perceives this event, and turns on the power switch, and primary side current of transformer increases.
Boundary conduction mode makes secondary current be restored to zero weekly, and dead resistance pressure drop will not cause load regulation error.With general DC-
DC continuous conduction mode is different, and LT8304-1 works in boundary conduction mode, and this conduction mode allows using lesser transformation
Device, and there is subharmonic oscillation.
In specific implementation of the invention, inverse-excitation type isolating transformer T1 includes a primary side and three secondary sides, three secondary sides
Winding is exported with independent.Primary side to secondary side turn ratio is 1:10:10:10, rather than single vice-side winding 1:30 turn ratio transformation
Device.1:10:10:10 transformer makes output voltage stress can be in three high voltage output diodes and three high voltage output electricity
It is shared between container.The voltage rating of single component only need to be the 1/3 of total voltage, thus help to obtain more available
Output diode and output capacitor.
In specific implementation of the invention, rectification and filtering output module include rectifier diode and filter capacitor, inverse-excitation type
Three independent windings T1B, T1C, the T1D on isolating transformer T1 pair side meet rectifier diode D respectivelyOUT1、DOUT2、DOUT3It carries out whole
Stream, passes through capacitor COUT1、COUT2、COUT3It is sequentially connected in series as shown in Figure 1 after pressure stabilizing and filtering.
The rectifier switch diode is three low VFRectifier diode DOUT2、DOUT2DOUT2；COUT1、COUT2、COUT3For filter
Wave capacitor, the filter capacitor carry out pressure stabilizing and filtering to voltage signal after diode rectification.
In specific implementation of the invention, voltage output control module is made of NMOS tube M5 and driving circuit, NMOS tube M5
The end D and rectifier diode DOUT1Negative terminal connection, the end S of NMOS tube M5 is connect with external loading.Power supply is controlled by the end G of M5
The opening and shutdown of voltage output improve the output dynamic response time of DC-DC module voltage.
Claims (8)
1. a kind of 1000V output is without optocoupler isolated form DC-DC power source circuit, it is characterised in that: power circuit includes: dedicated DC-
DC Switching Power Supply controls chip, inverse-excitation type isolating transformer, rectifier diode, filter capacitor and voltage output control module；Institute
Stating inverse-excitation type isolating transformer includes a primary side winding and three independent vice-side windings, primary side winding and vice-side winding electrically every
From primary and secondary side umber of turn ratio is 1:10:10:10；Voltage output control module is made of NMOS tube and driving circuit；Institute
It states inverse-excitation type isolating transformer primary side winding one end to connect with the positive VIN of DC-DC power source input, the inverse-excitation type isolating transformer is former
The side winding other end is connect with the dedicated DC-DC Switching Power Supply control 5 foot SW of chip, the inverse-excitation type isolating transformer three
One end of vice-side winding is connect with three rectifier diode anodes respectively, and the other end of two of them vice-side winding is respectively and wherein
Two rectifier diode negative terminal connections, third rectifier diode negative terminal are connect with the end voltage output control module NMOS tube M5D.
2. a kind of 1000V output according to claim 1 is without optocoupler isolated form DC-DC power source circuit, it is characterised in that: institute
Stating dedicated DC-DC Switching Power Supply control chip has input voltage under-voltage protection circuit module, by being serially connected in power input VIN
And two resistance R between direct current groundEN1And REN2Under-voltage protection voltage value is set, when
When, under-voltage protecting circuit work, dedicated DC-DC Switching Power Supply control chip interior PMOS tube M1 is turned off, and SW is defeated without switching signal
Out, DC-DC stops working.
3. a kind of 1000V output according to claim 1 is without optocoupler isolated form DC-DC power source circuit, it is characterised in that: institute
Stating dedicated DC-DC Switching Power Supply control chip has output voltage adjustment module, output voltage two non-essential resistances RF and RREF
Programming, passes through RF and RREFAdjust the output voltage of DC-DC module.
4. a kind of 1000V output according to claim 4 is without optocoupler isolated form DC-DC power source circuit, it is characterised in that:
DC-DC module output voltage calculation formula are as follows:Wherein VREF=1.000V, RF are anti-
Feed resistance, NPS are that inverse-excitation type isolating transformer primary and secondary side winding pricks number ratio, and VF is rectifier diode forward conduction pipe pressure
Drop.
5. a kind of 1000V output according to claim 1 is without optocoupler isolated form DC-DC power source circuit, it is characterised in that: institute
Stating dedicated DC-DC Switching Power Supply control chip has a primary side output electric current measure module, directly from primary side inverse-excitation type waveform to every
Photo-coupler need not also be used without configuring large scale high-voltage divider by carrying out sample detecting output voltage from output voltage.
6. a kind of 1000V output according to claim 1 is without optocoupler isolated form DC-DC power source circuit, it is characterised in that: three
A rectifier diode respectively rectifies the square wave of inverse-excitation type isolating transformer three secondary side outputs, and three filter capacitors are to two
Pole pipe rectified voltage signal carries out pressure stabilizing and filtering.
7. a kind of 1000V output according to claim 1 is without optocoupler isolated form DC-DC power source circuit, it is characterised in that:
The end D of NMOS tube M5 and rectifier diode DOUT1Negative terminal connection, the end S of NMOS tube M5 are connect with external loading, pass through the end G of M5
Control DC-DC power source voltage output.
8. a kind of 1000V output according to claim 1 is without optocoupler isolated form DC-DC power source circuit, it is characterised in that:
LT8304-1 embedded temperature compensation module is connected to R by the resistance on TC pinREFOn pin, two poles of output rectification are realized
Pipe temperature-compensating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811495153.2A CN109586579A (en) | 2018-12-07 | 2018-12-07 | A kind of 1000V output is without optocoupler isolated form DC-DC power source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811495153.2A CN109586579A (en) | 2018-12-07 | 2018-12-07 | A kind of 1000V output is without optocoupler isolated form DC-DC power source circuit |
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| Publication Number | Publication Date |
|---|---|
| CN109586579A true CN109586579A (en) | 2019-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811495153.2A Pending CN109586579A (en) | 2018-12-07 | 2018-12-07 | A kind of 1000V output is without optocoupler isolated form DC-DC power source circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431411A (en) * | 2020-03-05 | 2020-07-17 | 深圳市创芯微微电子有限公司 | Temperature compensation circuit, power control chip and power adapter |
| CN115333381A (en) * | 2022-10-12 | 2022-11-11 | 深圳市恒运昌真空技术有限公司 | High-pressure silicon wafer adsorption system applied to etching machine |
| CN116488433A (en) * | 2023-06-21 | 2023-07-25 | 成都智融微电子有限公司 | Auxiliary power supply circuit of switching power supply and control method thereof |
-
2018
- 2018-12-07 CN CN201811495153.2A patent/CN109586579A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431411A (en) * | 2020-03-05 | 2020-07-17 | 深圳市创芯微微电子有限公司 | Temperature compensation circuit, power control chip and power adapter |
| CN111431411B (en) * | 2020-03-05 | 2021-02-05 | 深圳市创芯微微电子有限公司 | Temperature compensation circuit, power control chip and power adapter |
| CN115333381A (en) * | 2022-10-12 | 2022-11-11 | 深圳市恒运昌真空技术有限公司 | High-pressure silicon wafer adsorption system applied to etching machine |
| CN116488433A (en) * | 2023-06-21 | 2023-07-25 | 成都智融微电子有限公司 | Auxiliary power supply circuit of switching power supply and control method thereof |
| CN116488433B (en) * | 2023-06-21 | 2023-09-12 | 成都智融微电子有限公司 | Auxiliary power supply circuit of switching power supply and control method thereof |
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Application publication date: 20190405 |