CN201733232U - Variable frequency power supply - Google Patents
Variable frequency power supply Download PDFInfo
- Publication number
- CN201733232U CN201733232U CN2010202928835U CN201020292883U CN201733232U CN 201733232 U CN201733232 U CN 201733232U CN 2010202928835 U CN2010202928835 U CN 2010202928835U CN 201020292883 U CN201020292883 U CN 201020292883U CN 201733232 U CN201733232 U CN 201733232U
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- power supply
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- isolating transformer
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Abstract
The utility model discloses a variable frequency power supply. An input terminal of a rectifier filter is connected with 220 AC (alternating current), an output terminal of the rectifier filter is connected with the input terminal of a DC-DC (direct current) switching circuit which outputs two ways of DC, wherein one way of DC is output to an auxiliary power module for providing power for a control and feedback circuit, and the other of DC is output to an inverter bridge circuit; and the output terminal of the inverter bridge circuit is connected with the input terminal of an isolating transformer which is used for outputting AC, the output terminal of the isolating transformer is connected to a feedback input terminal of the control and feedback circuit, and a control terminal of the control and feedback circuit controls a switch power tube in the inverter bridge circuit. The variable frequency power supply has the characteristics of high precision, fast response, good reliability, isolation from a power grid, no waveform distortion and the like, and is reasonable in design, simple in implementation and low in production cost.
Description
Technical field
The utility model relates to a kind of power circuit, specifically, relates to a kind of variable-frequency power circuit.
Background technology
At present, variable frequency power supply can be widely used in departments such as electric railway, electric power, telecommunications, traffic, chemical industry, finance, medical treatment, prime voltage stabilizing purifier as its power consumption equipment, effectively interference such as filtering mains by harmonics, spike and disturbance, for it provides sine-wave power highly reliable, high stable, be the key of the normal operation of assurance equipment.Can be used as the signal and the operating power of electric railway, the stand-by power supply that also can be used as power plant, transformer station uses, and gives microcomputer, communication, carrier wave, illumination or other power devices that can not have a power failure.But have that precision height, response are fast, a good reliability, the variable frequency power supply of isolating, having no waveform distortion with electrical network, its circuit complexity often, the cost of manufacture height, and realize difficulty.
The utility model content
A kind of variable frequency power supply that the utility model designs in order to solve the problems of the technologies described above just.
The technical scheme that its technical problem that solves the utility model adopts is:
A kind of variable frequency power supply comprises rectifier filter, DC-DC change-over circuit, accessory power supply, control and feedback circuit, inverter bridge circuit and isolating transformer; Its rectifier filter input connects the AC220 alternating current, the rectifier filter output links to each other with DC-DC change-over circuit input, DC-DC change-over circuit output two-way direct current, one road direct current is exported to the accessory power supply module, for control and feedback circuit power supply is provided, another road direct current is exported to the inverter bridge circuit; The inverter bridge circuit output end links to each other with the isolating transformer input, by isolating transformer output AC alternating current, the isolating transformer output is connected to the feedback input end of control and feedback circuit simultaneously, the switching power tube in the control end control inverter bridge circuit of control and feedback circuit.The control and the power tube of feedback circuit control switch master power model, detect voltage, electric current, short-circuit signal at outlet side; realize output overvoltage, overcurrent and short-circuit protection by the inside modules logical circuit; main power model is by the signal output energy of control and feedback module; main power model is exported the electric energy of required frequency; through transformer output required voltage, this interchange fundamental frequency is needed power supply output frequency.
Described variable frequency power supply, its rectifier filter adopts the single-phase full bridge rectification, again through LC filtering, exports steady direct current.
Described variable frequency power supply, its inverter bridge circuit is the full-bridge inverting structure, the Intelligent Power Module IPM that selects MIT for use is as power switch component, adopt double polarity sine ripple pulse width modulation mode SPWM that inverter is controlled, with steady DC converting is the interchange of pulse-width modulation output, this interchange fundamental frequency is needed power supply output frequency, and the pulse width modulated wave of inverter output is exported to isolating transformer after the filtering of output LC filter circuit.
The utility model variable frequency power supply characteristics are:
A) adopt the control of height integrated circuit;
B) adopt up-to-date SPWM technology;
C) adopt the transformer isolation measure, input, output are isolated mutually, and is safe and reliable;
D) have functions such as output overvoltage, overcurrent, short-circuit protection;
E) strong shock resistance, when being connected to the impact load, the effectively start of device energy;
F) precision of voltage regulation height, transient response is fast, and waveform distortion is little;
G) because pressurizer is always inverter output, therefore no matter how to distort its output of electrical network waveform is the gold standard sine wave;
The important technological parameters of the utility model variable frequency power supply is:
1, input voltage allowed band: single-phase AC 220V ± 20%
2, ac output voltage:
A) amount of exports constant volume: 1～500VA (choosing wantonly)
B) output voltage: AC5～380V ± 5% (choosing wantonly)
C) output frequency: 400Hz ± 0.1%
D) output frequency stability :≤0.1%
E) waveform distortion factor (THD) :≤2% (resistive load)
F) dynamic response :≤1% (unloaded) to fully loaded
G) power-factor of load: 0.8～1.0
H) overload capacity: 105%～150%
I) peak factor: 3: 1
J) conversion efficiency:＞80% (under 80% resistive load)
The beneficial effects of the utility model are that this variable frequency power supply has that precision height, response are fast, good reliability, with electrical network characteristics such as isolates, have no waveform distortion, and it is reasonable in design, realize simply and production cost low.
Description of drawings
Fig. 1 is the utility model variable frequency power supply functional block diagram.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
As shown in Figure 1, a kind of variable frequency power supply of the utility model comprises rectifier filter, DC-DC change-over circuit, accessory power supply, control and feedback circuit, inverter bridge circuit and isolating transformer; Its rectifier filter input connects the AC220 alternating current, the rectifier filter output links to each other with DC-DC change-over circuit input, DC-DC change-over circuit output two-way direct current, one road direct current is exported to the accessory power supply module, for control and feedback circuit power supply is provided, another road direct current is exported to the inverter bridge circuit; The inverter bridge circuit output end links to each other with the isolating transformer input, by isolating transformer output AC alternating current, the isolating transformer output is connected to the feedback input end of control and feedback circuit simultaneously, the switching power tube in the control end control inverter bridge circuit of control and feedback circuit.The control and the power tube of feedback circuit control switch master power model, detect voltage, electric current, short-circuit signal at outlet side; realize output overvoltage, overcurrent and short-circuit protection by the inside modules logical circuit; main power model is by the signal output energy of control and feedback module; main power model is exported the electric energy of required frequency; through transformer output required voltage, this interchange fundamental frequency is needed power supply output frequency.
Described variable frequency power supply, its rectifier filter adopts the single-phase full bridge rectification, again through LC filtering, exports steady direct current.
Described variable frequency power supply, its inverter bridge circuit is the full-bridge inverting structure, the Intelligent Power Module IPM that selects MIT for use is as power switch component, adopt double polarity sine ripple pulse width modulation mode SPWM that inverter is controlled, with steady DC converting is the interchange of pulse-width modulation output, this interchange fundamental frequency is needed power supply output frequency, and the pulse width modulated wave of inverter output is exported to isolating transformer after the filtering of output LC filter circuit.
The utility model is not limited to above-mentioned preferred forms, and other any identical with the utility model or akin products that anyone draws under enlightenment of the present utility model all drop within the protection range of the present utility model.
Claims (3)
1. a variable frequency power supply comprises rectifier filter, DC-DC change-over circuit, accessory power supply, control and feedback circuit, inverter bridge circuit and isolating transformer; It is characterized in that: the rectifier filter input connects the AC220 alternating current, the rectifier filter output links to each other with DC-DC change-over circuit input, DC-DC change-over circuit output two-way direct current, one road direct current is exported to the accessory power supply module, for control and feedback circuit power supply is provided, another road direct current is exported to the inverter bridge circuit; The inverter bridge circuit output end links to each other with the isolating transformer input, by isolating transformer output AC alternating current, the isolating transformer output is connected to the feedback input end of control and feedback circuit simultaneously, the switching power tube in the control end control inverter bridge circuit of control and feedback circuit.
2. variable frequency power supply according to claim 1 is characterized in that: rectifier filter adopts the single-phase full bridge rectification, again through LC filtering, exports steady direct current.
3. variable frequency power supply according to claim 1, it is characterized in that: the inverter bridge circuit is the full-bridge inverting structure, the Intelligent Power Module IPM that selects MIT for use is as power switch component, adopt double polarity sine ripple pulse width modulation mode SPWM that inverter is controlled, with steady DC converting is the interchange of pulse-width modulation output, this interchange fundamental frequency is needed power supply output frequency, and the pulse width modulated wave of inverter output is exported to isolating transformer after the filtering of output LC filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202928835U CN201733232U (en) | 2010-08-16 | 2010-08-16 | Variable frequency power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202928835U CN201733232U (en) | 2010-08-16 | 2010-08-16 | Variable frequency power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201733232U true CN201733232U (en) | 2011-02-02 |
Family
ID=43524388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202928835U Expired - Fee Related CN201733232U (en) | 2010-08-16 | 2010-08-16 | Variable frequency power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201733232U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497111A (en) * | 2011-11-20 | 2012-06-13 | 合肥华耀电子工业有限公司 | Fast-control power supply system based on IPM (intelligent power module) H-bridge cascade connection |
| CN103633854A (en) * | 2013-12-15 | 2014-03-12 | 贵阳航空电机有限公司 | Transducer |
| CN104377979A (en) * | 2013-08-14 | 2015-02-25 | 南京博兰得电子科技有限公司 | Inverter and power supply method and application thereof |
| CN106059350A (en) * | 2016-05-31 | 2016-10-26 | 东莞市思普电子有限公司 | AC wide-frequency conversion power supply |
-
2010
- 2010-08-16 CN CN2010202928835U patent/CN201733232U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497111A (en) * | 2011-11-20 | 2012-06-13 | 合肥华耀电子工业有限公司 | Fast-control power supply system based on IPM (intelligent power module) H-bridge cascade connection |
| CN104377979A (en) * | 2013-08-14 | 2015-02-25 | 南京博兰得电子科技有限公司 | Inverter and power supply method and application thereof |
| CN104377979B (en) * | 2013-08-14 | 2018-03-16 | 南京博兰得电子科技有限公司 | Inverter and its method of supplying power to and application |
| CN103633854A (en) * | 2013-12-15 | 2014-03-12 | 贵阳航空电机有限公司 | Transducer |
| CN106059350A (en) * | 2016-05-31 | 2016-10-26 | 东莞市思普电子有限公司 | AC wide-frequency conversion power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20110202 Termination date: 20170816 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |