CN201540360U - Electromagnetic compatibility inspection device of switch regulated power supply - Google Patents
Electromagnetic compatibility inspection device of switch regulated power supply Download PDFInfo
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- CN201540360U CN201540360U CN 200920174836 CN200920174836U CN201540360U CN 201540360 U CN201540360 U CN 201540360U CN 200920174836 CN200920174836 CN 200920174836 CN 200920174836 U CN200920174836 U CN 200920174836U CN 201540360 U CN201540360 U CN 201540360U
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- power supply
- voltage waveform
- electromagnetic compatibility
- regulated power
- electro magnetic
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Abstract
The utility model discloses an electromagnetic compatibility inspection device of a switch regulated power supply, which comprises a RC circuit, a voltage waveform detecting device and a judgment unit, wherein the RC circuit is used to span between the primary grade and the secondary grade of the switch regulated power supply, the voltage waveform detecting device is used to detect the voltage waveform on the two ends of a resistance, and is spanned on the two ends of the resistance in the RC circuit. The judgment unit is used to judge whether the electromagnetic compatibility of the source can meet demands according to the voltage waveform which is detected by the voltage waveform detecting device. The electromagnetic compatibility of the switch regulated power supply can be conveniently and rapidly inspect in low cost through using the electromagnetic compatibility inspection device of the switch regulated power supply.
Description
The explanation of dividing an application: the application number that the application submits on October 31st, 2008 for the applicant is 200820202703.2 divides an application.
Technical field
The Electro Magnetic Compatibility inspection machine that relates to switching power supply.
Background technology
Switching power supply is to utilize modern power electronics technology, by regulating dutycycle, to keep a kind of electronic product of regulated output voltage, it has all obtained application more and more widely at aspects such as computing machine, communication, space flight, color TV, and is promoting switching power supply and develop to directions such as highly reliable, low consumption, low noise, anti-interference and modularizations.Switching power supply can be divided into AC/DC and DC/DC two big classes, and the AC/DC conversion is a direct current with exchange conversion exactly.
For the Electro Magnetic Compatibility of standard electronic product, all developed countries and part developing country have all formulated electromagnetic compatibility standard.Electromagnetic compatibility standard is to make the basic demand that product can operate as normal in the actual electromagnetic environment.Most of country comprises that the standard of China all is based on the standard that International Electrotechnical Commission's (InternationalElectro Technical Commission is called for short IEC) is formulated.Although the electromagnetic compatibility standard file is various, the content complexity, but the aspect that requires with regard to equipment is seen, generally comprise the requirement of two aspects: electromagnetic compatibility standard has two aspects to the requirement of equipment, one can not produce bad electromagnetic interference effect when being equipment work to external world, another be can not be to external world the electromagnetic interference (EMI) tetchiness.The requirement of previous aspect is called disturbs emission (Electro Magnetic Interference is called for short EMI) requirement, and the requirement of a back aspect is called susceptibility (Electro Magnetic Susceptibility is called for short EMS) or immunity to interference requirement.Wherein, it is anti-interference etc. that the electromagnetic immunity degree requires to generally comprise surge (Surge).
In the past for the Electro Magnetic Compatibility of check valve stabilized voltage supply, manufacturer generally delivers to power supply special testing agency, whether use professional testing apparatus to test it meets the requirements of the standard, this makes manufacturer can not in time understand the Electro Magnetic Compatibility of product during fabrication, cost is also very high, this just the prior art letter treat improved place.
The utility model content
At the problem that prior art exists, the electromagnetism antijamming capability that the utility model is intended to improve power supply especially improves the noise immunity at aspects such as static release, electrical fast transient (eft) and surges.
For solving the problems of the technologies described above, the utility model provides a kind of Electro Magnetic Compatibility inspection machine of switching power supply, comprising:
The RC loop is used for cross-over connection between the primary and secondary of described switching power supply;
The voltage waveform pick-up unit is used to detect the voltage waveform at described resistance two ends, the resistance two ends of described voltage waveform pick-up unit cross-over connection in described RC loop;
Judging unit is used for the voltage waveform that records according to described voltage waveform pick-up unit, judges whether the Electro Magnetic Compatibility of this power supply can satisfy the demand.
By above-mentioned the technical solution adopted in the utility model as can be seen, because by cross-over connection one RC loop between primary and secondary, making can be easily and fast when the Electro Magnetic Compatibility of check valve stabilized voltage supply for the utility model, at low cost the Electro Magnetic Compatibility of switching power supply is tested.
Description of drawings
Figure 1 shows that existing switching power supply electrical block diagram;
Figure 2 shows that the circuit diagram of embodiment of the Electro Magnetic Compatibility inspection machine of a kind of switching power supply of the utility model.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment feature of the present utility model and technology contents are further specified.Accompanying drawing only is used to explain the utility model and is unrestricted.
Referring to Fig. 1, be depicted as existing switching power supply electrical block diagram.Alternating voltage is behind rectification filtering unit 11 rectifying and wave-filterings, become the DC voltage that contains certain pulsation composition, this voltage enters the square wave that high frequency conversion unit 12 is converted into the required voltage value, and this square-wave voltage enters and transfers wide square wave rectification filtering unit 13 to become needed DC voltage at last.Control circuit is a pulse-width modulator, and it mainly is made of circuit such as sampler, comparer, oscillator, width modulation and reference voltages.This part circuit is integrated at present, has made various Switching Power Supply integrated circuit.Control circuit is used for adjusting ratio switching time of HF switch element, to reach the purpose of regulated output voltage.
In power rows in the industry, can be the boundary generally with the transformer, power supply is divided into primary and secondary, for example among Fig. 2, transformer left-hand component is that power supply is elementary, the transformer right-hand component then is that power supply is secondary.
Referring to Fig. 2, be depicted as the circuit diagram of embodiment of the Electro Magnetic Compatibility inspection machine of a kind of switching power supply of the utility model.Being connected in parallel on the live wire of power input and the surge between the zero line absorbs module and 1. can and connect by surge absorber MOV (being zinc paste) and surge absorption common mode inductance L1 and form; Being connected across the static absorbing resistor of power supply between elementary and secondary 2. can be composed in series by two resistance R 12, R13; An electrical fast transient (eft) in parallel absorbs 3. i.e. common mode inductance L2 among the figure of common mode inductance between the power output end both positive and negative polarity.
Wherein, by surge absorber high surging has been absorbed; absorb common mode inductance L1 by surge again and can consume portion of energy (because inductance has damping action to transient current), effective like this other parts such as fuse and bridge rectifier pipe of having protected make product be unlikely to damage.
Wherein, by surge absorber MOV (being zinc paste) and surge absorb 1 couple of EFT of surge absorption module that common mode inductance L1 forms be electrical fast transient (eft) anti-interference also be useful.
Wherein, with regard to noise immunity, the common mode inductance L1 inductance value among the utility model embodiment is big more, and the power supply noise immunity is high more, and common mode inductance L2 inductance value is big more, and the power supply noise immunity is also high more.
Through check, compared with prior art, utilize the disclosed technology of the 3rd embodiment, the anti-interference intensity of power supply is greatly improved.With the IEC standard is benchmark, ESD (Electro-Static Discharge, static discharges) anti-interferencely bring up to more than the present 15KV by original 4KV, EFT (Electrical Fast Transient, electrical fast transient (eft)) anti-interferencely brought up to more than the present 2KV by original 1KV, Surge is anti-interference to be brought up to more than the present 4-6KV by original 1KV.Because EMI has not predictability within the specific limits, only depend on sample testing to be difficult to guarantee all products by the EMI standard, EMI detection technique of the present utility model can guarantee that all products can both meet the EMI standard of IEC when producing.
In the Switching Power Supply of anti-interference switch stabilized voltage supply especially no Y capacitance, coupling capacitance amount size between the transformer primary and secondary is the unsettled principal element of decision EMI effect, cross-over connection RC loop between the power supply primary and secondary, be connected the R14 two ends with voltage waveform pick-up unit (adopting oscillograph here), the size of primary and secondary coupling capacitance amount can produce the voltages having different magnitude peak value on resistance R, whether meet the EMI requirement by the voltage waveform decidable of testing the R14 two ends.Cause the difference of EMI for fear of load variations, product output is done load with resistance.In conjunction with Fig. 3, specify the equipment and the using method thereof of the Electro Magnetic Compatibility of the utility model check anti-interference switch stabilized voltage supply now, this method can may further comprise the steps:
Between the primary and secondary of described power supply cross-over connection RC loop 4., 4. this RC loop is made up of resistance R 14 and capacitor C 12;
Utilize oscillograph to detect the voltage waveform at resistance R 14 two ends on the described RC loop;
According to described oscillographic testing result, judge the Electro Magnetic Compatibility of described anti-interference switch stabilized voltage supply.
Wherein, described " according to described oscillographic testing result; judge the Electro Magnetic Compatibility of described anti-interference switch stabilized voltage supply " is meant: the peak-to-peak value that calculates the waveform that described oscillograph records, if this peak-to-peak value has surpassed a certain limit value, think that then the Electro Magnetic Compatibility of this power supply does not reach required requirement, wherein, this limit value can be provided with as required, such as, if need higher Electro Magnetic Compatibility, less limit value can be set, when the peak-to-peak value of the waveform that records surpasses this limit value, think that promptly the Electro Magnetic Compatibility of this product is defective, eliminated.
Wherein, according to the difference that the EMI allowance is required, the parameter of suitably adjusting RC can reach test request.
Preferably, a judging unit can also be set, obtain peak-to-peak value that oscillograph records automatically and itself and limit value are compared, and comparison result be fed back (, then sounding the alarm) such as if through checking this power supply nonconforming.
In addition, inspected noise immunity after, the RC loop be removed.
Preferably, RC loop and oscillograph can be integrated into special Electro Magnetic Compatibility inspection machine, only need during use with this inspection machine jump to power supply primary and secondary between, just can voltage waveform be shown by the waveform display screen.
Preferably, a further integrated judging unit in above-mentioned Electro Magnetic Compatibility inspection machine, directly according to the voltage waveform that records, the limit value of the peak-to-peak value that presets according to the user judges automatically whether the Electro Magnetic Compatibility of tested power supply can satisfy the demand.
Device embodiment described above only is schematic, wherein said unit as the separating component explanation can or can not be physically to separate also, the parts that show as the unit can be or can not be physical locations also, promptly can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select wherein some or all of module to realize the purpose of present embodiment scheme according to the actual needs.Those of ordinary skills promptly can understand and implement under the situation of not paying performing creative labour.
Above disclosed only is a kind of preferred embodiment among the utility model embodiment, can not limit interest field with this, and therefore the equivalent variations of being done according to the utility model claim still belongs to the scope that the utility model is contained.
Claims (1)
1. the Electro Magnetic Compatibility inspection machine of a switching power supply is characterized in that, comprising:
The RC loop is used for cross-over connection between the primary and secondary of described switching power supply;
The voltage waveform pick-up unit is used to detect the voltage waveform at described resistance two ends, the resistance two ends of described voltage waveform pick-up unit cross-over connection in described RC loop.
Judging unit is used for the voltage waveform that records according to described voltage waveform pick-up unit, judges whether the Electro Magnetic Compatibility of this power supply can satisfy the demand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920174836 CN201540360U (en) | 2008-10-31 | 2008-10-31 | Electromagnetic compatibility inspection device of switch regulated power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920174836 CN201540360U (en) | 2008-10-31 | 2008-10-31 | Electromagnetic compatibility inspection device of switch regulated power supply |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200820202703U Division CN201388152Y (en) | 2008-10-31 | 2008-10-31 | Anti-interference switch stabilized voltage power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201540360U true CN201540360U (en) | 2010-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920174836 Expired - Fee Related CN201540360U (en) | 2008-10-31 | 2008-10-31 | Electromagnetic compatibility inspection device of switch regulated power supply |
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| Country | Link |
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| CN (1) | CN201540360U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928691A (en) * | 2012-10-10 | 2013-02-13 | 中联重科股份有限公司 | System, method and device for detecting electromagnetic transient disturbance signals of electrical equipment |
| CN111175641A (en) * | 2020-01-17 | 2020-05-19 | 天津市滨海新区军民融合创新研究院 | Electrostatic discharge immunity testing method for processor chip |
-
2008
- 2008-10-31 CN CN 200920174836 patent/CN201540360U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928691A (en) * | 2012-10-10 | 2013-02-13 | 中联重科股份有限公司 | System, method and device for detecting electromagnetic transient disturbance signals of electrical equipment |
| CN111175641A (en) * | 2020-01-17 | 2020-05-19 | 天津市滨海新区军民融合创新研究院 | Electrostatic discharge immunity testing method for processor chip |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160830 Address after: 425000 Industrial Road, Hexi Industrial Zone, Lingling Industrial Zone, Lingling District, Yongzhou, Hunan Patentee after: Hunan tech-power Technology Co., Ltd. Address before: 518000 Guangdong city of Shenzhen province Baoan District Fuyong Whitehead Longwangmiao Industrial Zone sixteenth, 3, 4 Patentee before: Songshun Electronic (Shenzhen) Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100804 Termination date: 20161031 |
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| CF01 | Termination of patent right due to non-payment of annual fee |