CN101127496A - A single phase bidirectional SPWM frequency conversion device - Google Patents
A single phase bidirectional SPWM frequency conversion device Download PDFInfo
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- CN101127496A CN101127496A CNA2007100171749A CN200710017174A CN101127496A CN 101127496 A CN101127496 A CN 101127496A CN A2007100171749 A CNA2007100171749 A CN A2007100171749A CN 200710017174 A CN200710017174 A CN 200710017174A CN 101127496 A CN101127496 A CN 101127496A
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Abstract
The utility model relates to a single-phase bidirectional SPWM variable frequency device that can perform bidirectional sine wave frequency conversion, belonging to the power electronic technical field. The utility model comprises two power supplies, two capacitor inductance filtering circuits, two inverter bridges and a capacitor filtering circuit; the two power supplies are respectively connected with an inverter bridge after respectively passing a capacitor inductance filtering circuit, the two inverter bridges pass through the capacitor filtering circuit and output a direct current power supply together. The utility model has the advantages of strong service performance and wide application range. The utility model can be used as two single phases with different frequencies, or as two low power supplies with different frequencies that can interactively perform allocation to support frequency conversion. Meanwhile, according to the different voltage grades of the power supply, a two-level feed circuit, a three-level feed circuit or feed circuits with different levels can be used; therefore the reliability for load power supply is improved.
Description
(1) technical field
The present invention relates to a kind ofly can carry out two-way sinusoidal wave frequency conversion, particularly a kind of single phase bidirectional SPWM frequency conversion device belongs to electric and electronic technical field.
(2) background technology
Commonly used to the single-phase inversion power supply in original traditional ups system, its shortcoming is that energy can not bi-directional, and power is little, and device is many, can not change to the frequency of both sides, and shortcomings such as performance imperfection.
(3) summary of the invention
The present invention provides a kind of single phase bidirectional SPWM frequency conversion device in order to overcome the shortcoming that above power supply exists, and having solved its energy can not bi-directional, and power is little, and device is many, can not change to the frequency of both sides, and shortcomings such as performance imperfection.
The present invention is achieved through the following technical solutions:
Single phase bidirectional SPWM frequency conversion device of the present invention is made up of two power supplys, two capacitor and inductor filter circuits, two inverter bridge, a capacitor filter; By inserting an inverter bridge respectively behind the capacitor and inductor filter circuit, two inverter bridge are common output one direct current power supply behind capacitor filter separately for two power supplys.
Single phase bidirectional SPWM frequency conversion device of the present invention, wherein a kind of preferred version is: described capacitor and inductor filter circuit comprises a filter capacitor and an inductance, electric capacity is connected in parallel on both ends of power, the anode of an end power supply of inductance, and another termination inserts the mid point of inverter bridge; Described inverter bridge is a tri-level circuit, include four power devices that are in series, between the collector and emitter of power device respectively cross-over connection fly-wheel diode is arranged, two clamp diodes are connected across between power device collector electrode and the power device emitter with the form of series connection; Described capacitor filter includes the filter capacitor that is in series that is connected between the positive and negative bus of DC power supply, and the mid point of filter capacitor links to each other with the mid point of two clamp diodes.
Single phase bidirectional SPWM frequency conversion device of the present invention, another kind of preferred version is: described capacitor and inductor filter circuit comprises a filter capacitor and an inductance, and electric capacity is connected in parallel on both ends of power, the anode of an end power supply of inductance, another termination inserts the mid point of inverter bridge; Described inverter bridge is two level circuits, includes two power devices that are in series, between the collector and emitter of power device respectively cross-over connection fly-wheel diode is arranged; Described capacitor filter includes the filter capacitor that is in series that is connected between the positive and negative bus of DC power supply, and the mid point of filter capacitor is connected with the negative terminal of power supply.
The design feature of power circuit of the present invention is: power supply u1, u2 are separately by inserting an inverter bridge respectively behind electric capacity, the inductor filter, two inverter voltages are direct current power supply output jointly behind capacitor filtering, and provide complementary each other passage for two power supplys.
Converter plant of the present invention, it is strong to have a usability, applied range.Can be used as the single-phase use of two kinds of different frequencies, also can be used as two kinds of different frequency small-power powers and allocate the support frequency conversion mutually.Simultaneously can adopt two level or three level according to the difference of the electric pressure of power supply, the power supply circuits of varying level, thus improved reliability to electric.
(4) description of drawings
Fig. 1 is the mutually two-way SPWM translation circuit of a tri-level single structured flowchart
Among the figure: 1, capacitor and inductor filter circuit 2, inverter bridge 3, capacitor filter 4, inverter bridge 5, capacitor and inductor filter circuit
Fig. 2 is the mutually two-way SPWM translation circuit of a tri-level single schematic diagram
Among the figure: U1, U2 are power supply, and L1, L2 are inductance, and C1～C4 is an electric capacity, and T1～T8 is a power device, and D1～D4, D9～D12 are diode, and D5, D6, D7, D8 are clamp diode.
Fig. 3 is two level single phase bidirectional SPWM translation circuit schematic diagrams
Among the figure: U1, U2 are power supply, and T1～T4 is a power device, and C1～C4 is an electric capacity, and L1, L2 are inductance, and f1, f2 are frequency, and D1～D4 is a diode.
(5) embodiment
Below in conjunction with the drawings and specific embodiments the present invention is made specific description.
Embodiment 1:
As shown in Figure 1, the mutually two-way SPWM translation circuit of tri-level single structure chart
By inserting an inverter bridge (2,4) behind the capacitor and inductor filter circuit (1,5) respectively, two inverter bridge (2,4) are direct current power supply output jointly behind capacitor filter (3) separately for power supply u1, u2.
Embodiment 2:
The mutually two-way SPWM translation circuit of tri-level single structure principle chart as shown in Figure 2, this device is made up of identical two parts circuit.
1) u1 power unit: the filter capacitor C3 in parallel at power supply u1 two ends, the anode of power supply insert the mid point of inverter bridge by inductance L 1.Inverter bridge has four power device T1, T2, T3, T4 to adopt the form of series connection to connect, four sustained diode 1 in the circuit, D2, D3, D4 are connected across respectively between the collector electrode C and emitter E of T1, T2, T3, T4, two clamp diode D5, D6 are connected across between T2 collector electrode and the T3 emitter E with the form of connecting, filter capacitor C1, C2 are connected with the positive and negative bus of DC power supply respectively, and its other end links to each other with the mid point of two clamp diodes.
2) u2 power unit: the filter capacitor C4 in parallel at power supply u2 two ends, the anode of power supply insert the mid point of inverter bridge by inductance L 2.Inverter bridge has four power device T5, T6, T7, T8 to adopt the form of series connection to connect, four fly-wheel diodes in the circuit are connected across respectively between the collector electrode C and emitter E of T5, T6, T7, T8, two clamp diode D7, D8 are connected across between T6 collector electrode and the T7 emitter E with the form of connecting, the mid point of two clamp diode D7, D8 links to each other with the mid point of D5, D6, and the negative terminal of U1, U2 links to each other simultaneously.
Embodiment 3:
Two level single phase bidirectional SPWM translation circuit structure principle charts as shown in Figure 3, this device is made up of identical two parts circuit.
1) voltage is u1, and frequency is the f1 power unit: the filter capacitor C3 in parallel at power supply u1 two ends, the anode of power supply insert the mid point of inverter bridge by inductance L 1.Inverter bridge has the form of two power device T1, T2, employing series connection to connect, two sustained diode 1 in the circuit, D2, respectively be connected across T1, T2, collector electrode C and emitter E between, filter capacitor C1, C2 are connected with the positive and negative bus of DC power supply respectively, and its other end links to each other with the negative terminal of u1.
2) voltage is u2, and frequency is the f2 power unit: the filter capacitor C4 in parallel at power supply u2 two ends, the anode of power supply insert the mid point of inverter bridge by inductance L 2.Inverter bridge has the form of two power device T3, T4, employing series connection to connect, two sustained diode 3 in the circuit, D4 be connected across respectively T3, T4, collector electrode C and emitter E between, the negative terminal of U1, U2 links to each other.
The characteristics of single phase bidirectional SPWM frequency conversion device of the present invention are: the voltage of circuit one side is u1, Frequency is f1, and opposite side voltage is U2, and frequency is f2, when needs carry out transformation or electricity isolation, and can Add a transformer in the high side of frequency, then sort circuit can be realized the frequency conversion to f2 by f1 Or by the frequency conversion of f2 to f1. Can also guarantee also that simultaneously input power factor is 1. The spy of this frequency conversion Point, usability is strong, applied range. Can be used as the unidirectional use of two kinds of different frequencies, also can Allocate mutually the support frequency conversion as two kinds of different frequency small-power powers. When the f1 side has a power failure or voltage When not enough, by the power supply of f2 side direction f1 side, or when the power failure of f2 side or undertension, by f1 side direction f2 The side power supply has increased the reliability to load supplying like this.
Claims (3)
1. a single phase bidirectional SPWM frequency conversion device is characterized in that: be made up of two power supplys, two capacitor and inductor filter circuits, two inverter bridge, a capacitor filter; By inserting an inverter bridge respectively behind the capacitor and inductor filter circuit, two inverter bridge are common output one direct current power supply behind capacitor filter separately for two power supplys.
2. single phase bidirectional SPWM frequency conversion device according to claim 1, it is characterized in that: described capacitor and inductor filter circuit comprises a filter capacitor and an inductance, electric capacity is connected in parallel on both ends of power, the anode of an end power supply of inductance, and another termination inserts the mid point of inverter bridge; Described inverter bridge is a tri-level circuit, include four power devices (T1, T2, T3, T4) that are in series, between the collector and emitter of power device (T1, T2, T3, T4) respectively cross-over connection fly-wheel diode (D1, D2, D3, D4) is arranged, two clamp diodes (D5, D6) with the series connection form be connected across between power device (T2) collector electrode and power device (T3) emitter; Described capacitor filter includes the filter capacitor that is in series (C1, C2) that is connected between the positive and negative bus of DC power supply, and the mid point of filter capacitor (C1, C2) links to each other with the mid point of two clamp diodes (D5, D6).
3. single phase bidirectional SPWM frequency conversion device according to claim 1, it is characterized in that: described capacitor and inductor filter circuit comprises a filter capacitor and an inductance, electric capacity is connected in parallel on both ends of power, the anode of an end power supply of inductance, and another termination inserts the mid point of inverter bridge; Described inverter bridge is two level circuits, includes two power devices (T1, T2) that are in series, between the collector and emitter of power device (T1, T2) respectively cross-over connection fly-wheel diode (D1, D2) is arranged; Described capacitor filter includes the filter capacitor that is in series (C1, C2) that is connected between the positive and negative bus of DC power supply, and the mid point of filter capacitor (C1, C2) is connected with the negative terminal of power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100171749A CN101127496A (en) | 2007-09-29 | 2007-09-29 | A single phase bidirectional SPWM frequency conversion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100171749A CN101127496A (en) | 2007-09-29 | 2007-09-29 | A single phase bidirectional SPWM frequency conversion device |
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| CN101127496A true CN101127496A (en) | 2008-02-20 |
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| CNA2007100171749A Pending CN101127496A (en) | 2007-09-29 | 2007-09-29 | A single phase bidirectional SPWM frequency conversion device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158081A (en) * | 2011-04-07 | 2011-08-17 | 天津大学 | Three-level boosting DC converter and modulation method thereof |
| CN102510215A (en) * | 2011-11-17 | 2012-06-20 | 天津大学 | Three-level bidirectional direct-current converter and pulse width control method thereof |
| CN102848931A (en) * | 2012-09-14 | 2013-01-02 | 天津大学 | Energy source system structure of electric automobile |
| CN103795266A (en) * | 2014-02-19 | 2014-05-14 | 龚秋声 | Transformer-free single-phase and three-phase voltage reduction AC stabilized-voltage power supply |
-
2007
- 2007-09-29 CN CNA2007100171749A patent/CN101127496A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158081A (en) * | 2011-04-07 | 2011-08-17 | 天津大学 | Three-level boosting DC converter and modulation method thereof |
| CN102158081B (en) * | 2011-04-07 | 2013-03-27 | 天津大学 | Three-level boosting DC converter and modulation method thereof |
| CN102510215A (en) * | 2011-11-17 | 2012-06-20 | 天津大学 | Three-level bidirectional direct-current converter and pulse width control method thereof |
| CN102510215B (en) * | 2011-11-17 | 2014-04-02 | 天津大学 | Three-level bidirectional direct-current converter and pulse width control method thereof |
| CN102848931A (en) * | 2012-09-14 | 2013-01-02 | 天津大学 | Energy source system structure of electric automobile |
| CN103795266A (en) * | 2014-02-19 | 2014-05-14 | 龚秋声 | Transformer-free single-phase and three-phase voltage reduction AC stabilized-voltage power supply |
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