CN107241014A - Single-ion transient state effect for SCR pulse width modulators resists circuit - Google Patents
Single-ion transient state effect for SCR pulse width modulators resists circuit Download PDFInfo
- Publication number
- CN107241014A CN107241014A CN201710286790.8A CN201710286790A CN107241014A CN 107241014 A CN107241014 A CN 107241014A CN 201710286790 A CN201710286790 A CN 201710286790A CN 107241014 A CN107241014 A CN 107241014A
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- CN
- China
- Prior art keywords
- pulse width
- scr
- soft start
- start capacitor
- width modulators
- 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.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Circuit, including the SCR pulse width modulators with Thyristor/SCR structure, RC buffers, PNP type triode Q1 and NPN type triode Q2 are resisted the invention discloses the single-ion transient state effect for SCR pulse width modulators；RC buffers are made up of soft start capacitor C1, first resistor R1 and second resistance R2, wherein R1 and C1 series connections SCR pulse width modulators reference voltage vref and publicly between, R2 is connected in parallel on C1 two ends after being connected with the Q2；PNP type triode Q1, its emitter stage is connected with the COM ends of pulse width modulator, and colelctor electrode is with being publicly connected, and base stage is connected with soft start capacitor C1.The present invention can prevent the pulse width modulator in work from soft start capacitor is discharged when running into SEU events, and the soft start capacitor charging interval is consistent when the time required to allowing power supply simultaneously soft start capacitor charging when restarting with normal startup.
Description
Technical field
Circuit is resisted the invention provides a kind of single-ion transient state effect for SCR pulse width modulators, belongs to switch electricity
Source technology field.
Background technology
UC1846/7 type pulse width modulators are the controllers commonly used in current Switching Power Supply, and its use can be substantially reduced
The complexity and reduction circuit components usage quantity of switching power circuit.UC1846/7 type pulse width modulators have been internally integrated soft
Start-up circuit and protection circuit.It just need to can only realize and open in external soft start resistance, divider resistance, a soft start capacitor
When dynamic, UC1846/7 slowly opens the rate of hastening to soft start capacitor charging with controlling switch power supply；Output short-circuit or overpressure situation
When, UC1846/7 can make external soft start capacitor discharge and allow power supply to restart to protect power supply and load.But UC1846/
7 inside soft starting circuits have SCR structure, and SCR there is a possibility that single-particle inversion (SEU), so with this structure
UC1846/7 type pulse width modulators are not suitable for aerospace applications (i.e. satellite, airship, moon detector, Heavenly Palace space station etc.).
Space environment is extremely severe, there are various high energy particles, and these high energy particles can make turn on semiconductor junctions, so that
There is electronic equipment and the undesirable phenomenon seen of system.Soft starting circuit in UC1846/7 type controllers, due to there is SCR knots
Structure, it may appear that single-ion transient state effect --- single-particle inversion, causes soft start capacitor electric discharge to cause power supply output interruption, so
Influence whether the normal work even more serious consequence of load.Therefore, in the case of not other optional pulse width modulators,
Simultaneously in order to avoid serious consequence caused by UC1846/7 type controller simple grain effects, Switching Power Supply selection uses discrete component
Build pulse width modulator.Compared with the design using integrated circuit, this measure adds circuit complexity, also reduces power supply system
System reliability.
Fig. 1 show a kind of conventional start reset circuits of UC1846/7.In power supply starting up, soft start capacitor
C1 by being slowly charged predetermined voltage by R1 and the R2 resistance pressure-dividing network constituted, UC1846/7 output duty cycles also with
Slowly to broaden, output reaches slow startup effect.When receiving failure or cut-off signals, SCR (controllable silicon) is triggered and made
Soft start capacitor C1 discharges, untill discharge current drops below SCR maintenance electric current.Once SCR is triggered, electric discharge dress
Put and be latched always, (close to zero level) untill C1 is discharged into predetermined level, now above-mentioned electric discharge device is reset,
Subsequent power supply is restarted.SEU events can unexpectedly lead the triggering of SCR inside UC1846/7 processed, and this can force soft start capacitor
C1 is close to fully discharging, so that the power supply in normal work is interrupted suddenly.In this case, increase is connected with electric capacity C1
Resistance R1 will not work because SCR needed for maintain electric current it is particularly small, what the resistance needed for R1 will be greatly is surprising,
Also influence whether to the C1 charging intervals simultaneously.
Pulse width modulator for carrying out overcurrent protection using controllable silicon (SCR) structure, such as UC1846/7 needs one badly at present
Kind the circuit of single-ion transient state effect can be resisted, it can both prevent UC1846/7 from making above-mentioned soft open when running into SEU events
Dynamic condenser discharge, while when not interfering with startup yet soft start capacitor normal charge duration.
The content of the invention
In view of this, circuit is resisted the invention provides the single-ion transient state effect for SCR pulse width modulators, for adopting
The pulse width modulator of overcurrent protection is carried out with controllable silicon (SCR) structure, it can prevent the pulse width modulator in work from running into
Soft start capacitor is discharged during SEU events, and allow power supply the time required to soft start capacitor charging and normal when restarting simultaneously
The soft start capacitor charging interval is consistent during startup.
In order to achieve the above object, the technical scheme is that：Single-ion transient state effect for SCR pulse width modulators
Resist circuit, including the SCR pulse width modulators with Thyristor/SCR structure, RC buffers, PNP type triode Q1 and NPN type three
Pole pipe Q2.
RC buffers are made up of soft start capacitor C1, first resistor R1 and second resistance R2, and wherein R1 exists with C1 series connections
The reference voltage vref of SCR pulse width modulators and publicly between, R2 is connected in parallel on C1 two ends after being connected with Q2.
PNP type triode Q1, its emitter stage is connected with the COM ends of pulse width modulator, and colelctor electrode is with being publicly connected, base stage
It is connected with soft start capacitor C1.
Further, SCR pulse width modulators are UC1846/7.
Beneficial effect：
1st, the present invention is by abandoning start reset circuit sensitive to single-particle inside UC1846/7, using in periphery increasing
Plus one allow the circuit that soft start capacitor discharges to realize in physical fault.The circuit includes：P-type triode Q1, its
Emitter stage is connected with UC1846/7 7 pin COM ends, and colelctor electrode is with being publicly connected, and base stage is connected with soft start capacitor C1；RC delays
Rush device, its be coupling in UC1846/7 reference voltage and publicly between.Thus, when UC1846/7 starts, soft start capacitor
C1 is slowly charged by resistance R1, realizes start soft start, and in the case where occurring single-particle inversion, SCR conductings,
UC1846/7 1 pin voltage drops to or during close to zero level, due to UC1846/7 1 pin current limit adjustable side not with
Soft start capacitor is connected, so soft start capacitor electric discharge will not be caused to restart power supply.
2nd, circuit of the present invention also includes external fault and detects and turn off triggers circuit, it with soft start capacitor parallel coupled with
For discharging to soft start capacitor when detecting excessively stream or overvoltage, restart power cut-off to protect power supply and load.
Brief description of the drawings
Fig. 1 shows that UC1846 is latched using itself and starts reset circuit；
Fig. 2 shows the start reset circuit according to the present invention, and the circuit prevents the electric capacity as caused by SEU from discharging, and
With external reset function.
Embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
Embodiment 1, the present embodiment, which provide a kind of single-ion transient state effect resistance circuit for SCR pulse width modulators, to be included
SCR pulse width modulators, RC buffers, PNP type triode Q1 and NPN type triode Q2 with Thyristor/SCR structure.
RC buffers are made up of soft start capacitor C1, first resistor R1 and second resistance R2, and wherein R1 exists with C1 series connections
The reference voltage vref of SCR pulse width modulators and publicly between, R2 is connected in parallel on C1 two ends after being connected with Q2.
PNP type triode Q1, its emitter stage is connected with the COM ends of pulse width modulator, and colelctor electrode is with being publicly connected, base stage
It is connected with soft start capacitor C1.
The SCR pulse width modulators being directed in the present embodiment are UC1846/7.
The circuit reference picture 2 that the present embodiment is provided, Fig. 2 is described for preventing due to the SEU electric capacity C1 electric discharges being led to
Circuit.Without using UC1846 itself soft starting circuits, and a PNP type triode control PWM soft start is used, while not influenceing
Required C1 durations of charge.Q2 and R2 realize external reset function, for making soft start when event of failure occurs
Electric capacity C1 discharges.
Soft start capacitor C1 is slowly charged by resistance R1, and transistor Q1 is off state after powering, only in start
Worked when electric.
When SEU turns on the controllable silicon (SCR) inside UC1846 type pulse width modulators, because UC1846 1 pin is hanging,
Compared with circuit shown in Fig. 1, do not result in soft start capacitor C1 and discharged by SCR.
Breaking down in the case of (excessively stream or short circuit), soft start capacitor C1 with SCR due to not being connected, so can not lead to
Cross SCR electric discharges.A kind of replacement device is provided for making soft start capacitor discharge when failure situation occurs.This is by crystal
Pipe Q2 is come what is completed, and when failures are detected, Q2 is turned on, then it allows electric capacity C1 to be put by the series circuit including R2 and Q2
Electricity.
Therefore, the UC1846/7 of no Flouride-resistani acid phesphatase index inferior grade can be used in aerospace applications, because soft start is electric
Holding will not be discharged in the case where occurring SEU, therefore not result in the unexpected power-off of electrical equipment.
And the fault detect reset circuit being made up of transistor Q2 and resistance R2, when can be used for detecting failure or connects
When receiving off signal, make to restart after power supply power-fail.It is additionally, since electric capacity C1 to charge by resistance R1, so according to the present invention
Circuit without interference with normal capacitor charge duration.
To sum up, presently preferred embodiments of the present invention is these are only, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc. should be included in the protection of the present invention
Within the scope of.
Claims (2)
1. the single-ion transient state effect resistance circuit for SCR pulse width modulators, it is characterised in that including with controllable silicon SCR
SCR pulse width modulators, RC buffers, PNP type triode Q1 and the NPN type triode Q2 of structure；
The RC buffers are made up of soft start capacitor C1, first resistor R1 and second resistance R2, and wherein R1 exists with C1 series connections
The reference voltage vref of SCR pulse width modulators and publicly between, R2 is connected in parallel on C1 two ends after being connected with the Q2；
The PNP type triode Q1, its emitter stage is connected with the COM ends of pulse width modulator, and colelctor electrode is with being publicly connected, base stage
It is connected with soft start capacitor C1.
2. the single-ion transient state effect for SCR pulse width modulators resists circuit as claimed in claim 1, it is characterised in that
The SCR pulse width modulators are UC1846/7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710286790.8A CN107241014A (en) | 2017-04-27 | 2017-04-27 | Single-ion transient state effect for SCR pulse width modulators resists circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710286790.8A CN107241014A (en) | 2017-04-27 | 2017-04-27 | Single-ion transient state effect for SCR pulse width modulators resists circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107241014A true CN107241014A (en) | 2017-10-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710286790.8A Pending CN107241014A (en) | 2017-04-27 | 2017-04-27 | Single-ion transient state effect for SCR pulse width modulators resists circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107241014A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110545099A (en) * | 2019-08-02 | 2019-12-06 | 上海空间电源研究所 | high-reliability synchronous signal control circuit for spaceflight |
| CN114172358A (en) * | 2021-11-16 | 2022-03-11 | 北京卫星制造厂有限公司 | Satellite-borne secondary power supply single-particle transient suppression circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1714506A (en) * | 2002-11-14 | 2005-12-28 | 国际整流器公司 | Circuit for providing resistance to single event upset to pulse width modulator integrated circuit |
| CN204013206U (en) * | 2014-05-26 | 2014-12-10 | 徐州市恒源电器有限公司 | Soft startup circuit for power supply |
-
2017
- 2017-04-27 CN CN201710286790.8A patent/CN107241014A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1714506A (en) * | 2002-11-14 | 2005-12-28 | 国际整流器公司 | Circuit for providing resistance to single event upset to pulse width modulator integrated circuit |
| CN204013206U (en) * | 2014-05-26 | 2014-12-10 | 徐州市恒源电器有限公司 | Soft startup circuit for power supply |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110545099A (en) * | 2019-08-02 | 2019-12-06 | 上海空间电源研究所 | high-reliability synchronous signal control circuit for spaceflight |
| CN110545099B (en) * | 2019-08-02 | 2023-06-16 | 上海空间电源研究所 | High-reliability synchronous signal control circuit for spaceflight |
| CN114172358A (en) * | 2021-11-16 | 2022-03-11 | 北京卫星制造厂有限公司 | Satellite-borne secondary power supply single-particle transient suppression circuit |
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Application publication date: 20171010 |
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