CN204392093U - A kind of high-power isolated DC-ATX power supply with EMI filtering - Google Patents
A kind of high-power isolated DC-ATX power supply with EMI filtering Download PDFInfo
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- CN204392093U CN204392093U CN201520134806.XU CN201520134806U CN204392093U CN 204392093 U CN204392093 U CN 204392093U CN 201520134806 U CN201520134806 U CN 201520134806U CN 204392093 U CN204392093 U CN 204392093U
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- power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a kind of high-power isolated DC-ATX power supply with EMI filtering, the circuit of described power supply comprises direct current importation, buffer circuit part, ATX voltage conversion circuit, first order circuit is used for building electromagnetic interface filter, for meeting powered electromagnetic compatibility requirements; Second level circuit is used for realizing input and output electrical isolation, meets safety requirement, is the key realizing three ground separation; Tertiary circuit is voltage conversion portion, exports for each road realizing the requirement of ATX power standard, and by the high-power output of double push-pull circuit realiration, and sharing control part is used for realizing multi-power module and uses simultaneously.
Description
Technical field
The utility model relates to power technique fields, is specifically related to a kind of high-power isolated DC-ATX power supply with EMI filtering.
Background technology
At civil area, because of it, requirement about safety low-voltage in safety standard GB4943 is met for common DC-ATX power supply (input voltage 18V ~ 36V), as AC-DC power supply, seldom can realize the electrical isolation of primary side and secondary side when designing with isolating transformer, can not personal safety be affected because whether isolate.But at special dimensions such as military and industry controls, system or subsystem all need to do three ground and are separated, namely power supply input ground, between signal ground and casing ground without electrical connection.If do not carry out isolated design to power supply in these fields, its dielectric strength and megger test will be affected.Drawing its special requirement to electromagnetic compatibility in these fields also can be more strict, therefore enhancement mode EMI filter circuit will meet GJB151A requirement.Very important in these field modularized designs, will can meet miniaturization, lightening by conceptual design, power output is enough large simultaneously.
Summary of the invention
The technical problems to be solved in the utility model is: provide a kind of high-power isolated DC-ATX power supply with EMI filtering.
The technical scheme that the utility model adopts is:
A kind of high-power isolated DC-ATX power supply with EMI filtering, the circuit of described power supply comprises direct current importation, buffer circuit part, ATX voltage conversion circuit, wherein direct current importation input voltage is 18V-36V, power input is provided with EMI filter circuit, comprises common-mode noise filtering and differential mode noise filtering;
Buffer circuit part comprises MOSFET, flyback transformer, primary side control chip LTC3765, secondary side control chip LTC3766, wherein 18V-36V direct voltage to be converted into primary side control chip LTC3765 by MOSFET and to exchange, by the electrical isolation of flyback transformer realizing circuit, for improving the dynamic response of circuit, after power initiation, its control transfers to secondary side control chip LTC3766, through this partial circuit transform after export constant voltage 12V, for and circuit realize voltage transitions;
ATX voltage conversion circuit part comprises synchronous rectification chip LTC4352, high-power buck controller LT3729 and small-power buck controller LTC3845, and the 12V wherein exported by buffer circuit is realized rectification by synchronous rectification chip LTC4352 and exported 12Vout; Realize 5VSB by small-power buck controller LTC3845 and synchronous rectification chip LTC4352 to export; Realize 3.3Vout, 5Vout by high-power buck controller LT3729 and synchronous rectification chip LTC4352 to export.
For solving the high-power problem of 3.3V and 5V, 3.3Vout, 5Vout export and adopt two-way MOSFET to carry out voltage transitions.
Described ATX voltage conversion circuit part also comprises overvoltage protection chip LTC1696, and wherein the output of 12V input, high-power buck controller LT3729 and small-power buck controller LTC3845 is connected to primary side control chip LTC3765 respectively by overvoltage protection chip LTC1696 through optical coupler FODM121.
The beneficial effects of the utility model are: the utility model first order circuit is used for building electromagnetic interface filter, for meeting powered electromagnetic compatibility requirements; Second level circuit is used for realizing input and output electrical isolation, meets safety requirement, is the key realizing three ground separation; Tertiary circuit is voltage conversion portion, exports for each road realizing the requirement of ATX power standard, and by the high-power output of double push-pull circuit realiration, and sharing control part is used for realizing multi-power module and uses simultaneously.
Accompanying drawing explanation
Fig. 1 is the utility model circuit block diagram.
Embodiment
With reference to the accompanying drawings, by embodiment, the utility model is further illustrated:
Embodiment 1:
As shown in Figure 1, a kind of high-power isolated DC-ATX power supply with EMI filtering, the circuit of described power supply comprises direct current importation, buffer circuit part, ATX voltage conversion circuit, wherein direct current importation input voltage is 18V-36V, power input is provided with EMI filter circuit, comprises common-mode noise filtering and differential mode noise filtering;
Buffer circuit part comprises MOSFET, flyback transformer, primary side control chip LTC3765, secondary side control chip LTC3766, wherein 18V-36V direct voltage to be converted into primary side control chip LTC3765 by MOSFET and to exchange, by the electrical isolation of flyback transformer realizing circuit, for improving the dynamic response of circuit, after power initiation, its control transfers to secondary side control chip LTC3766, through this partial circuit transform after export constant voltage 12V, for and circuit realize voltage transitions;
ATX voltage conversion circuit part comprises synchronous rectification chip LTC4352, high-power buck controller LT3729 and small-power buck controller LTC3845, and the 12V wherein exported by buffer circuit is realized rectification by synchronous rectification chip LTC4352 and exported 12Vout; Realize 5VSB by small-power buck controller LTC3845 and synchronous rectification chip LTC4352 to export; Realize 3.3Vout, 5Vout by high-power buck controller LT3729 and synchronous rectification chip LTC4352 to export.
For solving the too low problem of efficiency that analog power brings, adopt digital power method for designing, wide pressure input (18V ~ 36V) is supported in direct current importation, and the maximum harm of digital power is exactly electromagnetic interference, for solution electromagnetic compatibility problem increases EMI filter circuit at power input.
Embodiment 2:
On the basis of embodiment 1, the present embodiment is the high-power problem solving 3.3V and 5V, and 3.3Vout, 5Vout export and adopt two-way MOSFET to carry out voltage transitions.
Embodiment 3:
On the basis of embodiment 1 or 2; described in the present embodiment, ATX voltage conversion circuit part also comprises overvoltage protection chip LTC1696, and wherein the output of 12V input, high-power buck controller LT3729 and small-power buck controller LTC3845 is connected to primary side control chip LTC3765 respectively by overvoltage protection chip LTC1696 through optical coupler FODM121.
This patent is based on chip transformer, optocoupler, Linear power conversion chip and EMI discrete component etc., and three ground realizing DC-ATX power supply with this are separated and improve power supply EMI characteristic.
Claims (3)
1. the high-power isolated DC-ATX power supply with EMI filtering, is characterized in that:
The circuit of described power supply comprises direct current importation, buffer circuit part, ATX voltage conversion circuit, and wherein direct current importation input voltage is 18V-36V, and power input is provided with EMI filter circuit, comprises common-mode noise filtering and differential mode noise filtering;
Buffer circuit part comprises MOSFET, flyback transformer, primary side control chip LTC3765, secondary side control chip LTC3766, wherein 18V-36V direct voltage to be converted into primary side control chip LTC3765 by MOSFET and to exchange, by the electrical isolation of flyback transformer realizing circuit, after power initiation, its control transfers to secondary side control chip LTC3766, after this partial circuit transforms, export constant voltage 12V;
ATX voltage conversion circuit part comprises synchronous rectification chip LTC4352, high-power buck controller LT3729 and small-power buck controller LTC3845, and the 12V wherein exported by buffer circuit is realized rectification by synchronous rectification chip LTC4352 and exported 12Vout; Realize 5VSB by small-power buck controller LTC3845 and synchronous rectification chip LTC4352 to export; Realize 3.3Vout, 5Vout by high-power buck controller LT3729 and synchronous rectification chip LTC4352 to export.
2. a kind of high-power isolated DC-ATX power supply with EMI filtering according to claim 1, is characterized in that: 3.3Vout, 5Vout export and adopt two-way MOSFET to carry out voltage transitions.
3. a kind of high-power isolated DC-ATX power supply with EMI filtering according to claim 1 and 2; it is characterized in that: described ATX voltage conversion circuit part also comprises overvoltage protection chip LTC1696, wherein the output of 12V input, high-power buck controller LT3729 and small-power buck controller LTC3845 is connected to primary side control chip LTC3765 respectively by overvoltage protection chip LTC1696 through optical coupler FODM121.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520134806.XU CN204392093U (en) | 2015-03-10 | 2015-03-10 | A kind of high-power isolated DC-ATX power supply with EMI filtering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520134806.XU CN204392093U (en) | 2015-03-10 | 2015-03-10 | A kind of high-power isolated DC-ATX power supply with EMI filtering |
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| Publication Number | Publication Date |
|---|---|
| CN204392093U true CN204392093U (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520134806.XU Expired - Fee Related CN204392093U (en) | 2015-03-10 | 2015-03-10 | A kind of high-power isolated DC-ATX power supply with EMI filtering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947531A (en) * | 2017-11-22 | 2018-04-20 | 深圳市库马克新技术股份有限公司 | A kind of Medical power control circuit for meeting EMC and safety standard |
-
2015
- 2015-03-10 CN CN201520134806.XU patent/CN204392093U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947531A (en) * | 2017-11-22 | 2018-04-20 | 深圳市库马克新技术股份有限公司 | A kind of Medical power control circuit for meeting EMC and safety standard |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20160310 |
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| CF01 | Termination of patent right due to non-payment of annual fee |