CN203788154U - Multipath output DC/DC secondary power supply system - Google Patents
Multipath output DC/DC secondary power supply system Download PDFInfo
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- CN203788154U CN203788154U CN201420199850.4U CN201420199850U CN203788154U CN 203788154 U CN203788154 U CN 203788154U CN 201420199850 U CN201420199850 U CN 201420199850U CN 203788154 U CN203788154 U CN 203788154U
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Abstract
The utility model discloses a multipath output DC/DC secondary power supply system which comprises a main circuit and a control loop. The main circuit comprises a filtration module, an auxiliary power supply module and at least one DC/DC conversion module. The control loop comprises a PWM module and a feedback circuit. The filtration module is respectively connected with the DC/DC conversion module and the auxiliary power supply module, the PWM module is respectively connected with the auxiliary power supply module and the DC/DC conversion module, and the feedback circuit is respectively connected with a power supply output end and the PWM module. A multipath output mode is adopted, and the multipath output DC/DC secondary power supply system has overheating, overvoltage, overcurrent, input overvoltage undervoltage and other protection functions, has a wide operating temperature range, has the characteristics of high efficiency, high stability, low output ripple voltage and the like, meets the requirement of multipath output of voltage and is accurate in control.
Description
Technical field
The utility model relates to electronic technology field, particularly relates to a kind of multichannel output DC/DC secondary power supply system.
Background technology
Along with the fast development of computer nowadays, electronics technology, the small electric apparatus such as camera, mobile phone, MP4, flat board, electric massage device, electric bicycle frequently use in enterprise, family, shop, and these small electric apparatus have multiple different power supply.Power electronic equipment is seen everywhere in people's work, life, these power electronic equipments all be unable to do without reliable power supply, take the lead in changing computer power supply and further substitute the power supplys such as various electronic and electrical equipments, switch, communication and detection of electrons and control appliance through Switching Power Supply at the end of last century, more promoting the fast development of switch power technology.Switching Power Supply has small size, high efficiency, low caloric value, stability and the advantage such as lightweight has replaced conventional power source gradually.The most single power limiteds of DC/DC switch power source function that use in now market, application inconvenience, is used the electronic product of DC power supply more and more, and required voltage is also different.DC/DC Switching Power Supply is the DC power supply voltage that the DC power supply voltage transformation of input is become to need, and can need to provide various voltage requirements to design different inputs, output direct-current switch power supply according to difference.For current contemporary electronic systems, even the electronic system the most simply being formed by single-chip microcomputer and I/O interface circuit, supply voltage is also generally have+5V, ± 10V, ± 12V, or ± the multichannel compositions such as 15V, and for the electronic system compared with complicated, different electronic systems not only has strict requirement to various supply voltage combinations and its electrical characteristics is also had to strict demand simultaneously.
Power supply is the power source of all electronic equipments, and it ensures the basic element of character of electronic equipment normal operation.According to data analysis, in the failure rate of electronic equipment statistics, power failure rate is approximately occupied 40-50%, proposes outside some basic demands being applied to the power supply of electronic equipment, also needs further to improve power supply Practical Performance and electric property requirement.Particularly, for target seeker secondary power supply, the DC power supply that primary power source is provided is transformed into the desired various voltages of subsystem such as detection system, information processing, driving control.Because its power work environment is stricter to the requirement of power supply, except reaching basic demand, also must consider temperature environment, electromagnetic compatible environment, ensure high efficiency, high stability, high fail safe simultaneously.Therefore, develop a kind of high stability, high reliability, high efficiency, have overvoltage, input over-and under-voltage defencive function, output ripple and low voltage, and the secondary power supply system that simultaneously meets the requirement of multichannel output voltage and accurately control is to be significant.
Utility model content
In order to overcome above-mentioned the deficiencies in the prior art, the utility model provides a kind of multichannel output DC/DC secondary power supply system, solves single Switching Power Supply and adopts multiple Switching Power Supply powerup issues, and output ripple is larger, the problems such as stability characteristic (quality) and strict working temperature thereof.
A kind of multichannel output DC/DC secondary power supply system, it is characterized in that, comprise main circuit and control loop, described main circuit comprises filtration module, accessory power supply module, at least one DC/DC conversion module, described control loop comprises PWM module and feedback circuit, described filtration module is connected with accessory power supply module with DC/DC conversion module respectively, described PWM module is connected with accessory power supply module and DC/DC conversion module respectively, and described feedback circuit is connected with PWM module with power output end respectively.When direct-current input power supplying is after filtering after module, enter accessory power supply module, by accessory power supply to PWM module for power supply, then under the controller action of PWM module, to form high-frequency pulse current, then through high frequency transformer, make its rectifier diode conducting in the time being input as high level (switching tube connection) by the break-make of switch controlled electric current, thereby making series inductance is charged state, transmit energy output dc voltage finally by filter circuit to load; On the contrary, in the time being input into low level (switching tube disconnection), inductance is discharge condition, and circuit will continue to release energy to load by fly-wheel diode, and output dc voltage.In order to keep voltage stabilization, two output voltage will make output pulse width change with the variation of output voltage through sampling, isolation feedback circuit after delivering to PWM controller, thus regulated output voltage.What pass through due to transformer primary side winding is unidirectional pulsating current, for avoiding magnetic saturation, guarantee magnetic flux in the time that each switch periods starts in initial value, when design, must make the magnetic resetting of transformer.
Further, described DC/DC conversion module comprises the switch power module being connected with filtration module output, the transformer being connected with switch power module output, the rectification filtering module being connected with transformer output.
Preferably, described switch power module is power MOS pipe, and described power MOS pipe model is IRF540NPBF or IRF120TRPBF.
Preferably, described transformer adopting PC40 magnetic core.
Preferably, described DC/DC conversion module adopts single-ended flyback circuit or single-ended forward type circuit.
Preferably, described PWM module is selected UCC2803 control chip.
Preferably, the optical coupler model that described feedback circuit adopts is GH137, and a reference source model is TL1431MDREP.
Further, also comprise input over under-voltage protection circuit, described input over under-voltage protection circuit is connected with filtration module and PWM module respectively.
Further, described control loop also comprises protective circuit, and described protective circuit is connected with PWM module with power output end respectively.
Compared with prior art; the beneficial effects of the utility model are: the utility model adopts the pattern of multichannel output; output gross power 200W; there is the defencive functions such as overheated, overvoltage, overcurrent and input over-and under-voltage; wide operating temperature range; also have the characteristics such as high efficiency, high stability, output ripple and low voltage, the secondary power supply system that meets the requirement of multichannel output voltage simultaneously and accurately control.
Brief description of the drawings
Fig. 1 is the fundamental diagram of the utility model multichannel output DC/DC secondary power supply system;
Fig. 2 is the fundamental diagram of feedback circuit in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further illustrated.
Secondary power supply system comprises and output energy is passed to the main circuit of output and by the control loop of main circuit described in input and the signal controlling that arrives of output detections.As shown in Figure 1, described main circuit is mainly by filtration module 1, accessory power supply module 2, form with at least one DC/DC conversion module 4, and described control loop is mainly made up of PMW module 3, feedback circuit 5 and protective circuit 6.Described DC/DC conversion module 4 comprises that switch power module 41, transformer 42(select PC40 magnetic core) and rectification filtering module 43, described filtration module 1 is connected with switch power module 41.Described accessory power supply module 2 is connected with filtration module 1 and PWM module 3 respectively; described PWM module 3 is connected with switch power module 41; between described rectification filtering module 43 and PWM module 3, be connected with feedback circuit 5 and protective circuit 6, between described filtration module 1 and PWM module 3, be connected with input over under-voltage protection circuit 7.Described filtration module can suppress the harmonic wave from external electrical network on the one hand, prevents that it from entering secondary power supply inside and affecting DC/DC conversion module, thereby has stoped the harmonic wave passage in external electrical network; On the other hand, suppress exactly the high-frequency harmonic of power module generation in the time of work of secondary power supply inside, prevent that it from entering external electrical network, thereby obstruct internal switch power module disturbs the passage of other responsive electromechanical equipment.
The present embodiment is 5 DC/DC conversion modules independently preferably, are mainly to transfer 27V input power to meet performance index demand independently Voltage-output of 5 tunnels, meet peripheral components and the equipment demand to power supply.In the present embodiment, little according to the DC/DC power module power output of-5V output, can adopt the design of reverse exciting topological structure, and+10V exports ,+5V output, + 15V output, the DC/DC power module of-15V output is because power output should adopt more greatly the DC/DC converter of positive activation type topological structure.In DC/DC conversion module, switch power module is metal-oxide-semiconductor, for 5V/13A, 10V/2A, 15V/2.5A, high-power MOS tube is selected in the power supply output of-15V/0.7A, be that preferred IRF540NPBF is input metal-oxide-semiconductor, the parameter of IRF540NPBF is NMOS pipe, TO-220 encapsulation, and IDS=34A, RGS=70m Ω, VDS=100V meet 5V/13A, 10V/2A, 15V/2.5A, the power supply output necessary requirement of-15V/0.7A, IRF540NPBF bottom surface is metallic packaging in addition, can heat be delivered on base by transition plate, accelerate the heat radiation of pipe; For-15V/0.7, small-power metal-oxide-semiconductor is selected in the power supply output of-5V/0.3A, be that preferred IRF120RPBF is input metal-oxide-semiconductor, the parameter of IRF120TRPBF is NMOS pipe, IDS=9.6A, RGS=21m Ω, VDS=100V meet above-mentioned requirements, because this output power of circuit is less, therefore need not consider heat dissipation problem in addition, device itself can meet heat radiation requirement.
Described PWM module adopts UCC2803 chip, UCC2803 is more a kind of integrated current Drive and Control Circuit processed, it is slow that Current Control pulse width modulator has overcome voltage-controlled Switching Power Supply frequency response, the shortcoming that voltage regulation and load regulation are low, UCC2803 circuit structure is simple, easily realizes encapsulating structure SO-8.
As shown in Figure 2, described feedback circuit 5 comprises feedback module 51 and voltage reference module 52, and described feedback circuit 51 comprises sampling output circuit 511, amplifying circuit 512 and error comparison circuit 513.Described feedback module is by employing optocoupler (photoelectrical coupler, model is GH137) after out-put supply sampling output is fed back to PWM module 3, and then control switch duty ratio, adjusts output voltage; Voltage reference module adopts a reference source TL1431MDREP, is mainly used in holding output voltage, and with described feedback module in error amplifier relatively adjust stable output voltage.Because being input between end and output of optocoupler transmitted by light signal, thereby on electric, isolate completely between two parts, there is no feedback and the interference of the signal of telecommunication, so performance is more stable, antijamming capability is also more intense.Little, the withstand voltage height of coupling capacitance between luminous tube and photosensitive tube, therefore common-mode rejection ratio is very high.In addition, it is little that optocoupler is input into resistance, and the noise in high internal resistance source is equivalent to by short circuit.Therefore the analog signal buffer circuit, being made up of photoelectrical coupler has good electric property.Photoelectrical coupler below is connected to voltage-reference TL1431MDREP, provide a reference voltage signal by it, when+Vout compares with reference voltage (2.5V) signal after dividing potential drop, when branch pressure voltage is during higher than reference voltage (2.5V), photodiode conducting current flowing, optocoupler output output electrical signals, passes into PWM and carries out pulse-width regulated; In like manner, when branch pressure voltage is during lower than reference voltage (2.5V), not conducting of photodiode, electric current is approximately 0, and optocoupler output is equivalent to off-state, and now PWM has maximum duty cycle.
The utility model provides a kind of multichannel output DC/DC secondary power supply system; effectively improve conversion efficiency and Voltage-output stability; there is the defencive functions such as overvoltage, overheated, overcurrent and input over-and under-voltage; have the characteristics such as high reliable and secure property, output ripple and low voltage and wide operating temperature range, the secondary power supply system that meets the requirement of multichannel output voltage simultaneously and accurately control.
Certainly; in the situation that not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art should make various corresponding changes and distortion according to the utility model, but these changes of carrying out on the basis of this principle, replacement and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (9)
1. a multichannel output DC/DC secondary power supply system, it is characterized in that, comprise main circuit and control loop, described main circuit comprises filtration module, at least one DC/DC conversion module, described control loop comprises PWM module, accessory power supply module and feedback circuit, described DC/DC conversion module is connected with filtration module respectively with accessory power supply module, described PWM module is connected with accessory power supply module and DC/DC conversion module respectively, and described feedback circuit is connected with PWM module with power output end respectively.
2. multichannel output DC/DC secondary power supply system according to claim 1, it is characterized in that, described DC/DC conversion module comprises the switch power module being connected with filtration module output, the transformer being connected with switch power module output, the rectification filtering module being connected with transformer output.
3. multichannel output DC/DC secondary power supply system according to claim 2, is characterized in that, described switch power module is power MOS pipe, and described power MOS pipe model is IRF540NPBF or IRF120TRPBF.
4. multichannel output DC/DC secondary power supply system according to claim 2, is characterized in that described transformer adopting PC40 magnetic core.
5. multichannel output DC/DC secondary power supply system according to claim 1, is characterized in that, described DC/DC conversion module adopts single-ended flyback circuit or single-ended forward type circuit.
6. multichannel output DC/DC secondary power supply system according to claim 1, is characterized in that, described PWM module is selected UCC2803 control chip.
7. multichannel output DC/DC secondary power supply system according to claim 1, is characterized in that, the optical coupler model that described feedback circuit adopts is GH137, and a reference source model is TL1431MDREP.
8. multichannel output DC/DC secondary power supply system according to claim 1, is characterized in that, also comprise input over under-voltage protection circuit, described input over under-voltage protection circuit is connected with filtration module and PWM module respectively.
9. multichannel output DC/DC secondary power supply system according to claim 1, is characterized in that, described control loop also comprises protective circuit, and described protective circuit is connected with PWM module with power output end respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420199850.4U CN203788154U (en) | 2014-04-23 | 2014-04-23 | Multipath output DC/DC secondary power supply system |
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| CN201420199850.4U CN203788154U (en) | 2014-04-23 | 2014-04-23 | Multipath output DC/DC secondary power supply system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026635A (en) * | 2015-11-30 | 2016-10-12 | 东莞市港奇电子有限公司 | DC/DC converter |
| CN106160461A (en) * | 2016-04-01 | 2016-11-23 | 北京安控科技股份有限公司 | A kind of functional safety power module |
| CN106505879A (en) * | 2016-12-19 | 2017-03-15 | 江苏省瑞宝特科技发展有限公司 | Internet of Things intelligent comprehensive supply unit |
| CN107612310A (en) * | 2017-09-18 | 2018-01-19 | 合肥华耀电子工业有限公司 | A kind of vehicle-mounted decompression DC/DC power supplys |
| CN109765956A (en) * | 2018-12-07 | 2019-05-17 | 兰州空间技术物理研究所 | A kind of space field ionization source suitable for Sipm photo-multiplier |
| CN110784095A (en) * | 2019-10-31 | 2020-02-11 | 深圳市奥拓电子股份有限公司 | High-efficiency switching power supply circuit and LED display screen |
| CN113271024A (en) * | 2021-06-28 | 2021-08-17 | 湖南宏微电子技术有限公司 | AC/DC converter for low-power microcircuit system |
| CN113452253A (en) * | 2021-07-06 | 2021-09-28 | 湖南宏微电子技术有限公司 | Miniature low-power hybrid integrated circuit and converter thereof |
-
2014
- 2014-04-23 CN CN201420199850.4U patent/CN203788154U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026635A (en) * | 2015-11-30 | 2016-10-12 | 东莞市港奇电子有限公司 | DC/DC converter |
| CN106160461A (en) * | 2016-04-01 | 2016-11-23 | 北京安控科技股份有限公司 | A kind of functional safety power module |
| CN106505879A (en) * | 2016-12-19 | 2017-03-15 | 江苏省瑞宝特科技发展有限公司 | Internet of Things intelligent comprehensive supply unit |
| CN106505879B (en) * | 2016-12-19 | 2019-12-10 | 江苏省瑞宝特科技发展有限公司 | intelligent integrated power supply device of Internet of things |
| CN107612310A (en) * | 2017-09-18 | 2018-01-19 | 合肥华耀电子工业有限公司 | A kind of vehicle-mounted decompression DC/DC power supplys |
| CN109765956A (en) * | 2018-12-07 | 2019-05-17 | 兰州空间技术物理研究所 | A kind of space field ionization source suitable for Sipm photo-multiplier |
| CN110784095A (en) * | 2019-10-31 | 2020-02-11 | 深圳市奥拓电子股份有限公司 | High-efficiency switching power supply circuit and LED display screen |
| CN113271024A (en) * | 2021-06-28 | 2021-08-17 | 湖南宏微电子技术有限公司 | AC/DC converter for low-power microcircuit system |
| CN113271024B (en) * | 2021-06-28 | 2022-05-13 | 湖南宏微电子技术有限公司 | AC/DC converter for low-power microcircuit system |
| CN113452253A (en) * | 2021-07-06 | 2021-09-28 | 湖南宏微电子技术有限公司 | Miniature low-power hybrid integrated circuit and converter thereof |
| CN113452253B (en) * | 2021-07-06 | 2022-05-06 | 湖南宏微电子技术有限公司 | Miniature low-power hybrid integrated circuit and converter thereof |
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Granted publication date: 20140820 Termination date: 20170423 |