CN205666762U - A power supply unit for metering device - Google Patents
A power supply unit for metering device Download PDFInfo
- Publication number
- CN205666762U CN205666762U CN201620430742.2U CN201620430742U CN205666762U CN 205666762 U CN205666762 U CN 205666762U CN 201620430742 U CN201620430742 U CN 201620430742U CN 205666762 U CN205666762 U CN 205666762U
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- Prior art keywords
- pfc controller
- supply unit
- power supply
- circuit
- output
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- 238000005070 sampling Methods 0.000 claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 239000000919 ceramic Substances 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims description 22
- 238000002955 isolation Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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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- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a power supply unit for metering device, including rectifier bridge output filter capacitance, the vice limit output filter capacitance of transformer, power output filter capacitance, zero cross detection circuit and PFC controller, rectifier bridge output filter capacitance adopts CBB electric capacity, and the vice limit output filter capacitance of transformer adopts solid -state electric capacity, and power output filter capacitance adopts the ceramic condenser, the PFC controller is given in direct current busbar voltage sampling circuit sampling direct current busbar voltage and transmission, zero cross detection circuit detects output voltage's zero crossing and transmission and gives the PFC controller, the PFC controller is used for controlling power supply unit according to output voltage, current signal and direct current busbar voltage signal output control waveform. The utility model discloses a replaceability can relatively poor electrolytic capacitor to control power supply unit according to the characteristic of output voltage wave form through the PFC controller, improve power supply unit's power factor, reduced the pollution to the electric wire netting harmonic, prolonged life.
Description
Technical field
This utility model is specifically related to a kind of supply unit for measuring instrument.
Background technology
Along with development and the raising of people's living standard of China's economic technology, Power Electronic Technique has been widely used for
Among the production of people and life.Primary power can be for conversion into the various voltages etc. required for people by power conversion technology
Level, various types of power supply, therefore, its importance is self-evident.
In recent years, along with the development of the technology such as intelligent grid, Internet of Things, intelligence instrument, as intelligent terminal, has had fast
The development of speed, and the most progressively start to replace traditional measuring instrument.The power supply of intelligence instrument is also by traditional linear power supply
Gradually it is improved to high power density, high efficiency Switching Power Supply.At present, the switch power supply line structure in intelligence instrument is general such as
Shown in Fig. 1: it can be seen that employ two high electrochemical capacitors pressure, jumbo after input side rectification, electrochemical capacitor is to work
Make very temperature sensitive, work under long-term high and low temperature, service life and the reliability of product can be substantially reduced；The most traditional
Switching power circuit power factor value relatively low (about 0.5) so that electrical network can be produced harmonic pollution, causes electric lines of force energy wave
Take.
Utility model content
The purpose of this utility model is to provide a kind of power factor power supply for measuring instrument high, life-span length to fill
Put.
This supply unit for measuring instrument that this utility model provides, including transformator, master switch pipe, rectification
Bridge output filter capacitor, transformer secondary output filter capacitor, power supply output filter capacitor, chip power supply circuit, output voltage
Sample circuit and output current sampling circuit, also include that DC-bus voltage sampling circuit, zero cross detection circuit and PFC control
Device, and rectifier bridge output filter capacitor employing CBB electric capacity, transformer secondary output filter capacitor uses solid capacitor, and power supply is defeated
Go out filter capacitor and use ceramic condenser；Chip power supply circuit input connects the high voltage bus after rectification, and outfan is to PFC control
Device is powered；DC-bus voltage sampling circuit sampling DC bus-bar voltage is also transferred to pfc controller；Zero cross detection circuit detects
The zero crossing of output voltage is also transferred to pfc controller；Pfc controller is for female according to output voltage, current signal and direct current
The output of line voltage signal controls waveform and is controlled master switch pipe.
The described supply unit for measuring instrument also includes overvoltage crowbar；Overvoltage crowbar input connects
Dc bus after rectification, outfan connects the power end of pfc controller, is used for protecting pfc controller.
Described output voltage sampling circuit, zero cross detection circuit all assist winding to be connected with the former limit of transformator；Transformation
The former limit auxiliary winding of device is for the output voltage of fed power supplies device, and inputs described output voltage sampling circuit and zero passage inspection
Slowdown monitoring circuit.
Described output voltage sampling circuit, zero cross detection circuit all export winding with the secondary power supply of transformator and are connected；
The secondary power supply output winding of transformator for externally exporting electric energy, simultaneously by output voltage by output voltage sampling circuit and
Zero cross detection circuit feeds back to pfc controller.
The described supply unit for measuring instrument also includes filter rectifier；Filter rectifier input and change
The former limit auxiliary winding of depressor connects, and outfan is connected with the outfan of chip power supply circuit；Filter rectifier is used for chip
The feedback signal of the former limit auxiliary winding of power supply circuits and transformator is filtered and rectification.
The described supply unit for measuring instrument also includes optocoupler；Optocoupler is connected to output voltage sampling circuit
And between pfc controller, between output current sampling circuit and pfc controller, DC-bus voltage sampling circuit and PFC control
Between device and between zero cross detection circuit and pfc controller, for sample circuit and pfc controller are carried out electrical isolation,
Ensure the safety of pfc controller.
Described master switch pipe is MOSFET, IGBT or audion.
The model of described pfc controller is LT3798.
This supply unit for measuring instrument that this utility model provides, by replacing the electrolysis electricity of prior art
Hold, thus ensure that reliability and the safety of this utility model device, extend the life-span of supply unit, also reduce simultaneously
The cost of supply unit；By pfc controller and zero cross detection circuit, DC-bus voltage sampling circuit according to output voltage ripple
Supply unit is controlled by the characteristic of shape, thus improves the power factor of supply unit, decreases supply unit humorous to electrical network
The pollution of ripple.
Accompanying drawing explanation
Fig. 1 is the switching power circuit structural representation of the conventional metered dose instrument of background technology.
Fig. 2 is the functional block diagram of a kind of embodiment of the present utility model.
Detailed description of the invention
It is illustrated in figure 2 the functional block diagram of a kind of embodiment of the present utility model: external ac power source passes through anti-lightning
And after EMI front end circuit, exporting high voltage direct current by rectifier circuit, CBB electric capacity replaces original electrochemical capacitor as filter
Ripple electric capacity is connected in parallel on the output two ends of rectifier bridge；Dc bus is directly connected to flyback transformer former limit main coil winding Np1's
Different name end, the Same Name of Ends of this main coil winding connects the drain electrode of master switch pipe Q, and master switch pipe movable end source electrode is with ground even
Connecing, the grid (i.e. controlling end) of master switch pipe connects pfc controller；Current sampling circuit gathers flyback transformer former limit master
The electric current of coil windings, and current sampling signal is exported pfc controller；The former limit of flyback transformer also has ancillary coil
Np2, the different name end ground connection of ancillary coil, Same Name of Ends is by output voltage sampling circuit, zero cross detection circuit with pfc controller even
Connect；Ancillary coil Np2For the output electric energy of supply unit is fed back, it is also used for pfc controller is powered simultaneously；
Output voltage sampling circuit is for sampling the output voltage of supply unit sampled signal is input to pfc controller；Zero passage is examined
Slowdown monitoring circuit is for detecting the zero crossing of output electric energy, and crossover point signal is transferred to pfc controller；Filter rectifier defeated
Entering end to be connected with the Same Name of Ends of auxiliary winding, for the electric energy powered to PFC being carried out rectification and filtering, and being input to PFC control
The power pins of device processed；The input of chip power supply circuit is connected with dc bus, outfan and the power pins of pfc controller
Connect, be used for ensureing that pfc controller quickly starts when supply unit initial power-on, to improve the performance of supply unit；Overvoltage
Protection circuit is connected between dc bus and pfc controller, for protecting pfc controller when DC bus-bar voltage is too high；
DC-bus voltage sampling circuit is for using the voltage of dc bus, and sampled voltage signal is input to pfc controller；
Pfc controller is as the core controller of supply unit, for according to DC bus-bar voltage signal, output voltage, current signal
With output voltage signal zero crossing information, produce pwm control signal and drive master switch pipe, thus ensure flyback transformer
Properly functioning, the former limit energy of flyback transformer is delivered to secondary；In this embodiment, the secondary of flyback transformer is altogether
There are three groups of windings, export three groups of power supplys respectively；It is respectively connected with filter capacitor respectively (figure to indicate at transformer secondary winding two ends
C2, C3 and C4), in this utility model, transformer secondary winding filter capacitor uses solid capacitor to substitute the electrolysis in background technology
Electric capacity；Additionally, at the outfan of supply unit, this utility model uses ceramic condenser to substitute the electrochemical capacitor in background technology；
Use solid capacitor or ceramic condenser to substitute electrochemical capacitor, make use of solid capacitor and the low cost of ceramic condenser, performance good
Advantage, it is ensured that supply unit no electrolytic capacitor, its operating temperature that can adapt to is higher, and performance is more stable.
Additionally, in this utility model technology, output voltage sampling circuit and zero cross detection circuit are possible not only to be connected to instead
Swash formula transformator former limit auxiliary winding, can be connected to equally flyback transformer secondary electric energy output winding in any one
In group: now, secondary electric energy output winding the most externally exports electric energy, also by output voltage sampling circuit and zero passage detection electricity
Road is to pfc controller output feedback signal.
In this utility model technology, it is also possible to use optocoupler；Optocoupler is as electrical isolation conventional in Power Electronic Technique
Parts, it is connected between output voltage sampling circuit and pfc controller, exports current sampling circuit and pfc controller
Between, between DC-bus voltage sampling circuit and pfc controller and between zero cross detection circuit and pfc controller, be used for
Sample circuit and pfc controller are carried out electrical isolation, it is ensured that the safety of pfc controller.
The master switch pipe used in this utility model can use identical the opening of the function such as MOSFET, IGBT or audion
Guan Guan.
The model of the pfc controller that this utility model uses is LT3798；This pfc controller can according to output voltage,
The waveform of electric current and DC bus-bar voltage waveform automatically control and adjust the work of master switch pipe, thus reduce on dc bus
Harmonic current and output voltage, the harmonic current of output electric current, thus both ensure that supply unit not to electrical network produce harmonic wave
Pollute, also ensure that the quality of output electric energy.
Claims (8)
1. for a supply unit for measuring instrument, including transformator, master switch pipe, rectifier bridge output filter capacitor, change
Depressor secondary output filter capacitor, power supply output filter capacitor, chip power supply circuit, output voltage sampling circuit and output electric current
Sample circuit, it is characterised in that also include DC-bus voltage sampling circuit, zero cross detection circuit and pfc controller, and rectification
Bridge output filter capacitor uses CBB electric capacity, and transformer secondary output filter capacitor uses solid capacitor, power supply output filter capacitor
Use ceramic condenser；Chip power supply circuit input connects the high voltage bus after rectification, and outfan is powered to pfc controller；Directly
Stream busbar voltage sampling circuit samples DC bus-bar voltage is also transferred to pfc controller；Zero cross detection circuit detection output voltage
Zero crossing and be transferred to pfc controller；Pfc controller is for believing according to output voltage, current signal and DC bus-bar voltage
Number output control waveform master switch pipe is controlled.
Supply unit for measuring instrument the most according to claim 1, it is characterised in that also include overvoltage crowbar；
Overvoltage crowbar input connects the dc bus after rectification, and outfan connects the power end of pfc controller, is used for protecting
Pfc controller.
Supply unit for measuring instrument the most according to claim 1, it is characterised in that described output voltage sampling
Circuit, zero cross detection circuit all assist winding to be connected with the former limit of transformator；The former limit auxiliary winding of transformator is used for feeding back electricity
The output voltage of source apparatus, and input described output voltage sampling circuit and zero cross detection circuit.
Supply unit for measuring instrument the most according to claim 1, it is characterised in that described output voltage sampling
Circuit, zero cross detection circuit all export winding with the secondary power supply of transformator and are connected；The secondary power supply output winding of transformator is used
In externally exporting electric energy, output voltage is fed back to PFC control by output voltage sampling circuit and zero cross detection circuit simultaneously
Device.
Supply unit for measuring instrument the most according to claim 1, it is characterised in that also include filter rectifier；
Filter rectifier input assists winding to be connected with the former limit of transformator, and outfan connects with the outfan of chip power supply circuit
Connect；Filter rectifier is filtered with whole for the feedback signal of the former limit of chip power supply circuit and transformator auxiliary winding
Stream.
Supply unit for measuring instrument the most according to claim 1, it is characterised in that also include optocoupler；Optocoupler is respectively
Be connected between output voltage sampling circuit and pfc controller, export between current sampling circuit and pfc controller, direct current female
Between line voltage sampling circuit and pfc controller and between zero cross detection circuit and pfc controller, for by sample circuit with
Pfc controller carries out electrical isolation, it is ensured that the safety of pfc controller.
7. according to the supply unit for measuring instrument one of claim 1 ~ 6 Suo Shu, it is characterised in that described master control is opened
Closing pipe is MOSFET, IGBT or audion.
8. according to the supply unit for measuring instrument one of claim 1 ~ 6 Suo Shu, it is characterised in that described PFC controls
The model of device is LT3798.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620430742.2U CN205666762U (en) | 2016-05-13 | 2016-05-13 | A power supply unit for metering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620430742.2U CN205666762U (en) | 2016-05-13 | 2016-05-13 | A power supply unit for metering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205666762U true CN205666762U (en) | 2016-10-26 |
Family
ID=57160103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620430742.2U Active CN205666762U (en) | 2016-05-13 | 2016-05-13 | A power supply unit for metering device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205666762U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915084A (en) * | 2016-05-13 | 2016-08-31 | 威胜集团有限公司 | Power supply device used for metering device |
-
2016
- 2016-05-13 CN CN201620430742.2U patent/CN205666762U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915084A (en) * | 2016-05-13 | 2016-08-31 | 威胜集团有限公司 | Power supply device used for metering device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20170116 Address after: 410003, Changsha, Yuelu District, silver basin Ling Ling Street, No. 359 South Road, No., No. two, 1-5 Patentee after: HUNAN SHENG AND ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 410205 Tongzi, Changsha, Changsha hi tech Development Zone, west slope road, No. 468, Patentee before: WASION Group Ltd. |
|
| CP03 | Change of name, title or address |
Address after: The two phase of the project wasion Technology Park No. 468 Tongzi high tech Development Zone in Hunan province Changsha slope 410205 West Road No. 11 building 101 floor No. 1-8 Patentee after: HUNAN SEEHRE POWER TECHNOLOGY CO.,LTD. Address before: 410003, Changsha, Yuelu District, silver basin Ling Ling Street, No. 359 South Road, No., No. two, 1-5 Patentee before: HUNAN SHENG AND ELECTRONIC TECHNOLOGY Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231106 Address after: Room 101, 3rd Floor, Building 11, Phase II of Weisheng Science and Technology Park, No. 468 Tongzipo West Road, High tech Development Zone, Changsha City, Hunan Province, 410205 Patentee after: Hunan Shenghe Intelligent Control Technology Co.,Ltd. Address before: 410205 no.1-8, 3rd floor, 101, No.11 plant, phase II project, Weisheng Science Park, no.468, tongzipo West Road, high tech Development Zone, Changsha City, Hunan Province Patentee before: HUNAN SEEHRE POWER TECHNOLOGY CO.,LTD. |
|
| TR01 | Transfer of patent right |