CN216564947U - Power supply device for converting single phase into three phases - Google Patents
Power supply device for converting single phase into three phases Download PDFInfo
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- CN216564947U CN216564947U CN202123022691.XU CN202123022691U CN216564947U CN 216564947 U CN216564947 U CN 216564947U CN 202123022691 U CN202123022691 U CN 202123022691U CN 216564947 U CN216564947 U CN 216564947U
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Abstract
The utility model belongs to the technical field of power equipment design and manufacture, and discloses a power supply device for converting single phase into three phases, which comprises a step-down transformer, an electric energy quality regulating circuit and a filter circuit, wherein the primary side input end of the step-down transformer is connected with single-phase voltage, the single-phase voltage is reduced into three groups of single-phase low voltages, each group of single-phase low voltages are connected with the electric energy quality regulating circuit, the electric energy quality regulating circuit is connected with the filter circuit, the electric energy quality regulating circuit respectively carries out single-phase rectification, single-phase inversion and sine wave modulation on the three groups of single-phase low voltages, the filter circuit filters harmonic waves generated in the single-phase rectification, single-phase inversion and sine wave modulation processes, and the three groups of single-phase low voltages are connected to form three-phase voltage. The utility model has simple structure, low cost and stable and non-interference output voltage.
Description
Technical Field
The utility model belongs to the technical field of design and manufacture of power equipment, and particularly relates to a power supply device for converting single phase into three phases.
Background
With the gradual development of the electrified railway, the electric locomotive has more obvious effect in national economic life, and the development speed is also increased. As the electric locomotive supplies power for a specific 27.5kV single phase, as long as an electrified railway exists, a single-phase 27.5kV power supply line is necessarily provided, and a through line and an industrial and civil three-phase (10kV/6kV/3kV/1140V/380V/220V and the like) power supply line are provided, the problem needs to be solved, and only a three-phase high-voltage line can be selected to be additionally built in the past.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a power supply device for converting a single phase into a three phase.
The utility model adopts the following technical scheme: the utility model provides a single-phase changes three-phase power supply unit, includes step-down transformer, electric energy quality control circuit and filter circuit, single-phase voltage is connected to step-down transformer's primary side input, and single-phase voltage step-down becomes three single-phase low pressures of group, every single-phase low pressure of group all with electric energy quality control circuit connects, electric energy quality control circuit is connected with filter circuit, electric energy quality control circuit carries out single-phase rectification, single-phase contravariant and sine wave modulation respectively to three single-phase low pressures of group, the harmonic that produces among filter circuit filtering single-phase rectification, single-phase contravariant and the sine wave modulation process, three single-phase low pressures of group are connected and are formed three-phase voltage.
The soft start circuit is connected with the yard wall side input end of the step-down transformer, and can control the on-off of the circuit and reduce the impact on the electric energy quality adjusting circuit during grid connection.
Further, the soft start loop comprises a switch and a soft start device, and the soft start device is connected with the switch in parallel.
Further, the soft start device comprises a soft start resistor, and the switch comprises a soft start contactor.
Further, the three groups of single-phase low voltages obtained at the secondary output end of the step-down transformer T1 include a phase voltage at a low-voltage side of the transformer, and a phase voltage at a low-voltage side of the transformer;
the electric energy quality adjusting circuit 3 comprises fourteen power modules in a series chain structure, the phase voltage of the A phase at the low-voltage side of the transformer, the phase voltage of the B phase at the low-voltage side of the transformer and the phase voltage of the C phase at the low-voltage side of the transformer are all connected with the input ends of the fourteen power modules, and each power module carries out rectification, inversion and sine wave modulation on the input voltage.
Further, the power module comprises a rectifying circuit and an inverter circuit connected with the rectifying circuit;
the rectifying circuit comprises a first diode, a second diode, a third diode and a fourth diode; the cathode end of the first diode is connected with the cathode end of the second diode, the anode end of the first diode is connected with the cathode end of the third diode, the anode end of the third diode is connected with the anode end of the fourth diode, the cathode end of the fourth diode is connected with the anode end of the second diode, and the anode end of the fourth diode is connected with the cathode end of the second diode through the first capacitor;
the inverter circuit comprises a first IGBT tube, a second IGBT tube, a third IGBT tube and a fourth IGBT tube; the emitter end of the first IGBT tube is connected with the collector end of the third IGBT tube, the collector end of the first IGBT tube is connected with the collector end of the second IGBT tube, and the collector end of the first IGBT tube and the collector end of the second IGBT tube are both connected with the cathode end of the second diode; the emitter end of the third IGBT tube is connected with the emitter end of the fourth IGBT tube, the emitter end of the third IGBT tube is connected with the anode end of the third diode and the anode end of the fourth diode, and the collector end of the fourth IGBT tube is connected with the emitter end of the second IGBT tube;
the gate pole end of the first IGBT tube, the gate pole end of the second IGBT tube, the gate pole end of the third IGBT tube and the gate pole end of the fourth IGBT tube are all connected with the output end of the driving plate, and the SPWM signal output by the driving plate drives the conduction states of the first IGBT tube, the second IGBT tube, the third IGBT tube and the fourth IGBT tube to output required voltage.
Furthermore, the collector terminal of the first IGBT is connected to the emitter terminal of the third IGBT through a second capacitor, and the collector terminal of the second IGBT is connected to the emitter terminal of the fourth IGBT through a third capacitor C3;
the power supply end of the driving board is connected with a first power supply and a second power supply, the first power supply and the second power supply are connected with the secondary output end of a power transformer, the primary input end of the power transformer is connected with a first input connecting end and a second input connecting end, the first input connecting end is connected with the anode end of a first diode, and the second input connecting end is connected with the cathode end of a fourth diode.
Furthermore, the filter loop comprises a capacitor and an inductor, and the output ends of the three groups of power quality adjusting circuits (3) are connected with the inductor in series and connected with the capacitor in a star connection mode.
The utility model has the beneficial effects that: the power supply device is characterized in that power is taken from a 27.5KV power bus, the problem of difficult power supply in a specific environment is solved, three groups of single-phase low voltages are output by a step-down transformer to a 27.5KV voltage step-down secondary output end, the three groups of single-phase low voltages are subjected to conversion processing such as rectification and inversion by an electric energy quality regulating circuit, and then 10Kv three-phase voltage is formed by three-phase connection, so that the stability of power supply to a load is ensured. The output voltage is stable and has no interference, and the method is suitable for occasions with small load capacity and small current requirement.
Drawings
Fig. 1 is a block diagram of a power supply device according to the present invention.
Fig. 2 is a schematic diagram of the connection between the secondary output end of the step-down transformer and the power quality adjusting circuit according to the present invention.
Fig. 3 is a schematic structural diagram of a power module according to the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an embodiment of the present invention, fig. 1 is a block diagram of a structure provided according to an embodiment of the present invention, and as shown in fig. 1, the power supply apparatus includes: the single-phase low-voltage power supply comprises a step-down transformer T1, a power quality adjusting circuit 3 and a filtering loop, wherein the primary side input end of the step-down transformer T1 is connected with single-phase voltage, the single-phase voltage is reduced into three groups of single-phase low voltages, each group of single-phase low voltages are connected with the power quality adjusting circuit 3, the power quality adjusting circuit 3 is connected with the filtering loop, the power quality adjusting circuit 3 respectively performs single-phase rectification, single-phase inversion and sine wave modulation on the three groups of single-phase low voltages, the filtering loop filters harmonic waves generated in the single-phase rectification, single-phase inversion and sine wave modulation processes, and the three groups of single-phase low voltages are connected to form three-phase voltage.
Wherein, the input single-phase voltage of the primary side of the transformer is 27.5kV, and the three-phase voltage is 10 kV.
The utility model gets electricity from a 27.5KV power bus, solves the problem of difficult power supply in a specific environment, the step-down transformer outputs three groups of single-phase low voltages to the 27.5KV voltage step-down secondary output end, the three groups of single-phase low voltages are all subjected to transformation processing such as rectification and inversion by the power quality adjusting circuit, and three phases of 10kV voltages are formed by three-phase connection, so as to ensure the stability of power supply to a load. The output voltage is stable and has no interference, and the method is suitable for occasions with small load capacity and small current requirement.
In an embodiment of the present invention, the power supply device further includes a soft start loop 2, one end of the soft start loop 2 is connected to the primary input end of the step-down transformer T1, and the soft start loop 2 can control the on/off of the circuit and reduce the impact during grid connection. The soft start loop 2 comprises a switch and a soft start device, and the soft start device is connected with the switch in parallel. The switch controls the on-off of the circuit, the soft starting device can adopt the starting resistor R, when the soft starting device works, the impact on the electric energy quality adjusting circuit when the grid connection is reduced through the starting device, and after the switch is closed, the starting device is short-circuited, so that the working requirement of the whole circuit cannot be influenced. The switch may employ a contactor KM.
In one embodiment of the present invention, as shown in fig. 2, the three sets of single-phase low voltages obtained at the secondary output terminal of the step-down transformer T1 include a voltage at a transformer low-voltage side a, a voltage at B and a voltage at C. The step-down transformer steps down the 27.5kV high voltage into three groups of 660V low voltages, namely a phase voltage at the low-voltage side of the transformer, a phase voltage at the low-voltage side of the transformer and a phase voltage at the low-voltage side of the transformer, namely a phase voltage at the low-voltage side of the transformer, and a phase voltage at the low-voltage side of the transformer, C phase voltage.
The three groups of voltages are equal and range from 600V to 660V.
The power quality adjusting circuit 3 comprises fourteen power modules in a series chain structure, wherein the phase voltage of the A phase at the low voltage side of the transformer, the phase voltage of the B phase at the low voltage side of the transformer and the phase voltage of the C phase at the low voltage side of the transformer are all connected with the input ends of the fourteen power modules, and according to the illustration in fig. 2, the power modules connected with the phase voltage of the A phase at the low voltage side of the transformer are respectively A1-A14; the power modules connected with the voltage of the B phase on the low-voltage side of the transformer are B1-B14 respectively, and the power modules connected with the voltage of the C phase on the low-voltage side of the transformer are C1-C14 respectively. Each power module rectifies, inverts, and sine-wave modulates the input voltage.
In one embodiment of the utility model, the power module comprises a rectifying circuit and an inverter circuit connected with the rectifying circuit.
The rectifying circuit comprises a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4; the cathode end of the first diode D1 is connected with the cathode end of the second diode D2, the anode end of the first diode D1 is connected with the cathode end of the third diode D3, the anode end of the third diode D3 is connected with the anode end of the fourth diode D4, the cathode end of the fourth diode D4 is connected with the anode end of the second diode D2, and the anode end of the fourth diode D4 is connected with the cathode end of the second diode D2 through the first capacitor C1.
The inverter circuit comprises a first IGBT tube 1, a second IGBT tube 2, a third IGBT tube IGBT3 and a fourth IGBT tube IGBT 4; the emitter end of the first IGBT1 is connected with the collector end of the third IGBT3, the collector end of the first IGBT1 is connected with the collector end of the second IGBT2, and the collector ends of the first IGBT1 and the second IGBT2 are connected with the cathode end of the second diode D2; the emitter terminal of the third IGBT tube IGBT3 is connected to the emitter terminal of the fourth IGBT tube IGBT4, the emitter terminal of the third IGBT tube IGBT3 is connected to the anode terminal of the third diode D3 and the anode terminal of the fourth diode D4, and the collector terminal of the fourth IGBT tube IGBT4 is connected to the emitter terminal of the second IGBT tube IGBT 2.
The gate terminal of the first IGBT tube IGBT1, the gate terminal of the second IGBT tube IGBT2, the gate terminal of the third IGBT tube IGBT3 and the gate terminal of the fourth IGBT tube IGBT4 are all connected to the output end of the drive board 13, and the SPWM signal output by the drive board 13 drives the on-state of the first IGBT tube IGBT1, the second IGBT tube IGBT2, the third IGBT tube IGBT3 and the fourth IGBT tube IGBT4 to output a required voltage.
The collector terminal of the first IGBT1 is connected with the emitter terminal of the third IGBT3 through a second capacitor C2, and the collector terminal of the second IGBT2 is connected with the emitter terminal of the fourth IGBT4 through a third capacitor C3. The soft start loop 2 controls the capacitor pre-charging in the power module, and reduces the current impact in the capacitor charging process.
The power supply end of the driving board 13 is connected to the first power supply 11 and the second power supply 12, the first power supply 11 and the second power supply 12 are connected to the secondary output end of the power transformer 10, the primary input end of the power transformer 10 is connected to the first input connection end and the second input connection end, the first input connection end is connected to the anode end of the first diode D1, and the second input connection end is connected to the cathode end of the fourth diode D4. The emitter terminal of the first IGBT1 is connected with the collector terminal of the third IGBT3 to serve as a first output terminal, the emitter terminal of the second IGBT2 is connected with the collector terminal of the fourth IGBT4 to serve as a second output terminal, and the voltage between the first output terminal and the second output terminal serves as the voltage value of the output terminal between the power modules. The voltage of fourteen power modules in series is used as the output voltage of the whole power quality adjusting circuit 3.
In one embodiment of the present invention, the first power source 11 and the second power source 12 are mutually backup power sources for the driving board 13, that is, when the first power source 11 is operated, the second power source 12 is the backup power source for the first power source 11, and when the second power source 12 is operated, the first power source 11 is the backup power source for the second power source 12, so as to ensure the stability and reliability of power supply to the driving board 13.
The power module is a basic rectifying-inverting circuit. The rectification side is diode rectification, and the inversion side is H-bridge single-phase inversion based on an IGBT module. Sinusoidal single-phase alternating current output can be obtained by performing sinusoidal wave modulation SPWM control on the inverter circuit. The method specifically comprises the steps that the pulse width is changed according to a sine rule and an SPWM waveform equivalent to a sine wave is used for controlling the on-off of a switching device in an inverter circuit, so that the area of the output pulse voltage is equal to the area of the sine wave expected to be output in a corresponding interval, and the frequency and the amplitude of the output voltage of the inverter circuit can be adjusted by changing the frequency and the amplitude of a modulation wave.
In one embodiment of the present invention, the filter loop includes a capacitor C and an inductor L, and the output ends of the three sets of power quality adjusting circuits 3 are all connected in series with the inductor L and connected with the capacitor C in a star connection manner.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. The power supply device is characterized by comprising a step-down transformer (T1), an electric energy quality adjusting circuit (3) and a filter circuit, wherein the primary side input end of the step-down transformer (T1) is connected with single-phase voltage, the single-phase voltage is reduced into three groups of single-phase low voltages, each group of single-phase low voltages are connected with the electric energy quality adjusting circuit (3), the electric energy quality adjusting circuit (3) is connected with the filter circuit, the electric energy quality adjusting circuit (3) respectively performs single-phase rectification, single-phase inversion and sine wave modulation on the three groups of single-phase low voltages, the filter circuit filters harmonic waves generated in the single-phase rectification, single-phase inversion and sine wave modulation processes, and the three groups of single-phase low voltages are connected to form three-phase voltage.
2. The power supply device for converting single phase into three phases according to claim 1, further comprising a soft start loop (2), wherein one end of the soft start loop (2) is connected to the primary input end of the step-down transformer (T1), and the soft start loop (2) can control the on/off of the circuit and reduce the impact on the power quality adjusting circuit (3) during grid connection.
3. A power supply arrangement for converting single phase to three phase according to claim 2, characterized in that said soft start circuit (2) comprises a switch and a soft start device, said soft start device being connected in parallel with the switch.
4. A power supply arrangement as claimed in claim 3, wherein the soft start means comprises a soft start resistor (R) and the switch comprises a contactor (KM).
5. The power supply apparatus for converting single-phase to three-phase according to claim 1, wherein the three sets of single-phase low voltages obtained from the secondary side output terminal of the step-down transformer (T1) include a transformer low-side a phase voltage, a transformer low-side B phase voltage, and a transformer low-side C phase voltage;
the power quality adjusting circuit (3) comprises fourteen power modules in a series chain structure, the phase voltage at the low-voltage side of the transformer and the phase voltage at the low-voltage side of the transformer are all connected with the input ends of the fourteen power modules, and each power module rectifies, inverts and modulates sine waves of the input voltage.
6. The power supply apparatus according to claim 5, wherein the power module includes a rectifying circuit, an inverter circuit connected to the rectifying circuit;
the rectifying circuit comprises a first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4); the cathode end of the first diode (D1) is connected with the cathode end of the second diode (D2), the anode end of the first diode (D1) is connected with the cathode end of the third diode (D3), the anode end of the third diode (D3) is connected with the anode end of the fourth diode (D4), the cathode end of the fourth diode (D4) is connected with the anode end of the second diode (D2), and the anode end of the fourth diode (D4) is connected with the cathode end of the second diode (D2) through the first capacitor (C1);
the inverter circuit comprises a first IGBT tube (IGBT 1), a second IGBT tube (IGBT 2), a third IGBT tube (IGBT 3) and a fourth IGBT tube (IGBT 4); the emitter end of the first IGBT (IGBT 1) is connected with the collector end of the third IGBT (IGBT 3), the collector end of the first IGBT (IGBT 1) is connected with the collector end of the second IGBT (IGBT 2), and the collector end of the first IGBT (IGBT 1) and the collector end of the second IGBT (IGBT 2) are both connected with the cathode end of the second diode (D2); the emitter terminal of the third IGBT (IGBT 3) is connected with the emitter terminal of the fourth IGBT (IGBT 4), the emitter terminal of the third IGBT (IGBT 3) is connected with the anode terminal of the third diode (D3) and the anode terminal of the fourth diode (D4), and the collector terminal of the fourth IGBT (IGBT 4) is connected with the emitter terminal of the second IGBT (IGBT 2);
the gate terminal of a first IGBT (IGBT 1), the gate terminal of a second IGBT (IGBT 2), the gate terminal of a third IGBT (IGBT 3) and the gate terminal of a fourth IGBT (IGBT 4) are all connected with the output end of the drive board (13), and the SPWM signal output by the drive board (13) drives the conduction states of the first IGBT (IGBT 1), the second IGBT (IGBT 2), the third IGBT (IGBT 3) and the fourth IGBT (IGBT 4) so as to output the required voltage.
7. The power supply device for converting single phase into three phases as claimed in claim 6, wherein the collector terminal of the first IGBT (IGBT 1) is connected with the emitter terminal of a third IGBT (IGBT 3) through a second capacitor (C2), and the collector terminal of the second IGBT (IGBT 2) is connected with the emitter terminal of a fourth IGBT (IGBT 4) through a third capacitor (C3);
the power supply end of the driving board (13) is connected with a first power supply (11) and a second power supply (12), the first power supply (11) and the second power supply (12) are connected with the secondary output end of a power transformer (10), the primary input end of the power transformer (10) is connected with a first input connecting end and a second input connecting end, the first input connecting end is connected with the anode end of a first diode (D1), and the second input connecting end is connected with the cathode end of a fourth diode (D4).
8. A power supply arrangement for single-to-three phases as claimed in claim 1, characterized in that said filter circuit comprises a capacitor (C) and an inductor (L), the outputs of the three sets of power quality control circuits (3) being connected in series with the inductor (L) and the capacitor (C) being connected in a star connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123022691.XU CN216564947U (en) | 2021-12-03 | 2021-12-03 | Power supply device for converting single phase into three phases |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123022691.XU CN216564947U (en) | 2021-12-03 | 2021-12-03 | Power supply device for converting single phase into three phases |
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| CN216564947U true CN216564947U (en) | 2022-05-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050728A (en) * | 2021-12-03 | 2022-02-15 | 日新电机（无锡）有限公司 | Power supply device for converting single phase into three phase |
| CN115171456A (en) * | 2022-06-29 | 2022-10-11 | 国网宁夏电力有限公司培训中心 | Nuclear phase training device for special operation electrician |
-
2021
- 2021-12-03 CN CN202123022691.XU patent/CN216564947U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050728A (en) * | 2021-12-03 | 2022-02-15 | 日新电机（无锡）有限公司 | Power supply device for converting single phase into three phase |
| CN115171456A (en) * | 2022-06-29 | 2022-10-11 | 国网宁夏电力有限公司培训中心 | Nuclear phase training device for special operation electrician |
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