Power supply circuit applied to three-phase Vienna rectifier control system

Abstract

The invention relates to the technical field of power supply circuits, in particular to a power supply circuit applied to a three-phase Vienna rectifier control system, which comprises a three-phase Vienna rectifier and a voltage transformation circuit, the three-phase Vienna rectifier comprises a capacitor C3 and a capacitor C7; one end of the capacitor C3 is provided with a positive output port; one end of the capacitor C7 is provided with a negative output port; the voltage transformation circuit comprises a main control module U1, a switching tube Q7, a switching tube Q8, a transformer T1, an output module and an auxiliary power supply module; the primary side of the transformer T1 is provided with a first winding and a second winding; the secondary side of the transformer T1 is provided with a third winding and a fourth winding. The switching tube Q7 or the switching tube Q8 is arranged, the first winding and the second winding are arranged at the same time, and electricity is taken from the capacitor C3 and the capacitor C7, so that the voltage borne by the switching tube Q7 and the switching tube Q8 can be effectively reduced, the service life of the power supply is prolonged, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of power supply circuits, and in particular to a power supply circuit applied to a three-phase Vienna rectifier control system. Background Art

[0002] In order to meet the growing demand for electricity and adapt to complex and changing electricity usage scenarios, a large number of power electronic devices have been widely used. In order to solve the contradiction between the three-phase AC power supply of the power grid and the DC power supply of a large number of electronic devices, three-phase AC / DC rectifiers have become an indispensable electrical link in power electronic equipment in many electricity usage scenarios.

[0003] The grid-side input current of traditional diode rectifiers and phase-controlled rectifiers contains a large amount of low-order harmonics, which is the main source of grid harmonics. Compared with traditional diode rectifiers and phase-controlled rectifiers, Vienna rectifiers have the advantages of low grid-side harmonic content and high power factor. At the same time, Vienna rectifiers have fewer power switches than ordinary bridge PWM rectifiers, further improving the system power density.

[0004] The input voltage of the traditional switching power supply is taken from the bus voltage after rectification by the Vienna rectifier. In the Vienna dynamic regulation, the normal output range of the bus voltage can output up to 900V, and the abnormal output can reach thousands of V. Therefore, the voltage level of the switch tube selected in the flyback power supply design needs to reach more than 2000V. This kind of switch tube is expensive and easy to damage, and is not suitable for mass application. At the same time, once the switch tube is damaged, the entire system will not work properly. Summary of the invention

[0005] The object of the present invention is to provide a power supply circuit applied to a three-phase Vienna rectifier control system in view of the above-mentioned deficiencies in the prior art.

[0006] The object of the present invention is achieved through the following technical scheme: a power supply circuit applied to a three-phase Vienna rectifier control system, comprising a three-phase Vienna rectifier and a transformer circuit; the three-phase Vienna rectifier comprises a capacitor C3 and a capacitor C7; one end of the capacitor C3 is provided with a positive output port; one end of the capacitor C7 is provided with a negative output port; the other end of the capacitor C3 and the other end of the capacitor C7 are both grounded;

[0007] The voltage conversion circuit includes a main control module U1, a switch tube Q7, a switch tube Q8, a transformer T1, an output module and an auxiliary power supply module;

[0008] The primary side of the transformer T1 is provided with a first winding and a second winding; the secondary side of the transformer T1 is provided with a third winding and a fourth winding;

[0009] The control end of the switch tube Q7 and the control end of the switch tube Q8 are respectively connected to the output end of the main control module U1; one end of the first winding is connected to the positive output port; the other end of the first winding is grounded through the switch end of the switch tube Q7; one end of the second winding is grounded; the other end of the second winding is connected to the negative output port through the switch end of the switch tube Q8;

[0010] The output module and the auxiliary power supply module are connected to the third winding and the fourth winding respectively.

[0011] The present invention is further configured such that the switch tube Q7 and the switch tube Q8 are both MOS tubes.

[0012] The present invention is further configured that the voltage conversion circuit further includes a pulse transformer T2; a resistor R25 is provided between one end of the primary side of the pulse transformer T2 and the output end of the main control module U1; the other end of the primary side of the pulse transformer T2 is grounded;

[0013] One end of the secondary side of the pulse transformer T2 is connected to the negative output port; a resistor R26 is provided between the other end of the secondary side of the pulse transformer T2 and the gate of the switch tube Q8;

[0014] One end of the secondary side of the pulse transformer T2 is connected to the source of the switch tube Q8;

[0015] The drain of the switch tube Q8 is connected to the other end of the second winding.

[0016] The present invention is further configured such that a voltage regulator tube D13 is provided between the drain of the switch tube Q8 and the source of the switch tube Q8; a resistor R28 is provided between the drain of the switch tube Q8 and the source of the switch tube Q8;

[0017] A diode D12 is disposed at the other end of the second winding; a capacitor C17 and a resistor R16 are disposed between the diode D12 and one end of the second winding.

[0018] The present invention is further configured such that a resistor R17 is provided between the gate of the switch tube Q7 and the output end of the main control module U1; the drain of the switch tube Q7 is connected to the other end of the first winding; a diode D10 is provided at the drain of the switch tube Q7; a resistor R14 and a capacitor C14 are provided between the diode D10 and one end of the first winding.

[0019] The present invention is further configured such that the voltage transformer circuit also includes a detection resistor R21, a resistor R18 and a resistor R19; the main control module U1 is provided with a first detection end; the source of the switch tube Q7 is grounded through the detection resistor R21; the source of the switch tube Q7 is connected to the first detection end through the resistor R19; the source of the switch tube Q7 is connected to the gate of the switch tube Q7 through the resistor R18.

[0020] The present invention is further configured such that the transformer circuit also includes a detection transformer T3 and a resistor R31; one end of the primary side of the detection transformer T3 is connected to the negative output port; the other end of the primary side of the detection transformer T3 is connected to the source of the switch tube Q8; one end of the secondary side of the detection transformer T3 is grounded; the other end of the secondary side of the detection transformer T3 is connected to the first detection end; and the resistor R31 is arranged between the two ends of the secondary side of the detection transformer T3.

[0021] The present invention is further configured such that the main control module U1 is provided with a second detection end; the voltage conversion circuit also includes an optocoupler U2 and a resistor R23; the output end of the auxiliary power supply module is connected to the input end of the optocoupler U2 through the resistor R23; the output end of the optocoupler U2 is connected to the second detection end.

[0022] The present invention is further configured that the three-phase Vienna rectifier includes an input interface, a diode module, an inductor module and a switch tube module;

[0023] The input interface is connected to one end of the inductor module; the other end of the inductor module is connected to the input end of the switch tube module; the output end of the switch tube module is arranged between capacitor C3 and capacitor C7; one end of the capacitor C3 and one end of the capacitor C7 are respectively connected to the other end of the inductor module through the diode module.

[0024] The present invention is further configured such that the voltage conversion circuit further includes an operational amplifier U3; the operational amplifier U3 is connected to the input end of the optical coupler U2.

[0025] Beneficial effects of the present invention: The present invention sets a switch tube Q7 or a switch tube Q8, and sets a first winding and a second winding at the same time, and draws power from capacitor C3 and capacitor C7 respectively, thereby effectively reducing the voltage borne by the switch tube Q7 and the switch tube Q8, increasing the life of the power supply and reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0027] Figure 1 is a circuit diagram of a three-phase Vienna rectifier of the present invention;

[0028] Figure 2 is a circuit diagram of a voltage conversion circuit of the present invention;

[0029] Among them: 1. Positive output port; 2. Negative output port; 31. First winding; 32. Second winding; 33. Third winding; 34. Fourth winding; 41. Input interface; 42. Diode module; 43. Inductor module; 44. Switch tube module; 51. Output module; 52. Auxiliary power supply module. DETAILED DESCRIPTION

[0030] The present invention is further described in conjunction with the following examples.

[0031] Depend on Figure 1 to Figure 2 It can be seen that the power supply circuit applied to the three-phase Vienna rectifier control system described in this embodiment includes a three-phase Vienna rectifier and a transformer circuit; the three-phase Vienna rectifier includes a capacitor C3 and a capacitor C7; one end of the capacitor C3 is provided with a positive output port 1; one end of the capacitor C7 is provided with a negative output port 2; the other end of the capacitor C3 and the other end of the capacitor C7 are both grounded;

[0032] The voltage conversion circuit includes a main control module U1, a switch tube Q7, a switch tube Q8, a transformer T1, an output module 51 and an auxiliary power supply module 52; wherein the model of the main control module U1 is UC3844;

[0033] The primary side of the transformer T1 is provided with a first winding 31 and a second winding 32; the secondary side of the transformer T1 is provided with a third winding 33 and a fourth winding 34;

[0034] The control end of the switch tube Q7 and the control end of the switch tube Q8 are respectively connected to the output end of the main control module U1; one end of the first winding 31 is connected to the positive output port 1; the other end of the first winding 31 is grounded through the switch end of the switch tube Q7; one end of the second winding 32 is grounded; the other end of the second winding 32 is connected to the negative output port 2 through the switch end of the switch tube Q8;

[0035] The output module 51 and the auxiliary power supply module 52 are connected to the third winding 33 and the fourth winding 34 respectively.

[0036] Specifically, in the power supply circuit applied to the three-phase Vienna rectifier control system described in this embodiment, the number of turns and the wire diameter of the first winding 31 and the second winding 32 are consistent. Under normal circumstances, the voltages across the capacitors C3 and C7 are substantially the same, and the switch tubes Q7 and Q8 are controlled to be turned on and off at the same time.

[0037] When the switch tube Q7 and the switch tube Q8 are turned on, the first winding 31 and the second winding 32 store energy through the positive output port 1 and the negative output port 2 respectively. When the switch tube Q7 and the switch tube Q8 are turned off, the first winding 31 and the second winding 32 convert the stored energy into back electromotive force to provide output to the output module 51 and the auxiliary power supply module 52.

[0038] If the switch tube module 44 of the three-phase Vienna rectifier is damaged, resulting in an imbalance between the voltage U1 and the voltage U2, but the total output voltage U3 does not change much, the total energy stored in the first winding 31 and the second winding 32 will not change, and will not affect the normal output of the power supply.

[0039] When one of the switch tubes Q7 or Q8 is damaged, the main control module U1 can adjust the duty cycle through the current and voltage loop to ensure that the undamaged switch tube winding loop can output normally.

[0040] In addition, this embodiment provides a switch tube Q7 or a switch tube Q8, and provides a first winding 31 and a second winding 32, respectively drawing power from capacitors C3 and C7, thereby effectively reducing the voltage borne by the switch tubes Q7 and Q8, increasing the life of the power supply and reducing the cost.

[0041] In the power supply circuit for a three-phase Vienna rectifier control system described in this embodiment, the switch tube Q7 and the switch tube Q8 are both MOS tubes. The above arrangement facilitates the on-off control of the switch tube Q7 and the switch tube Q8.

[0042] The power supply circuit for a three-phase Vienna rectifier control system described in this embodiment, the transformer circuit further includes a pulse transformer T2; a resistor R25 is provided between one end of the primary side of the pulse transformer T2 and the output end of the main control module U1; the other end of the primary side of the pulse transformer T2 is grounded;

[0043] One end of the secondary side of the pulse transformer T2 is connected to the negative output port 2; a resistor R26 is provided between the other end of the secondary side of the pulse transformer T2 and the gate of the switch tube Q8;

[0044] One end of the secondary side of the pulse transformer T2 is connected to the source of the switch tube Q8;

[0045] The drain of the switch tube Q8 is connected to the other end of the second winding 32 .

[0046] Specifically, in this embodiment, by providing the pulse transformer T2, it is possible to isolate the switch tube Q7 from the switch tube Q8, thereby enhancing the stability of the power supply circuit.

[0047] In the power supply circuit applied to a three-phase Vienna rectifier control system described in this embodiment, a voltage regulator tube D13 is provided between the drain of the switch tube Q8 and the source of the switch tube Q8; a resistor R28 is provided between the drain of the switch tube Q8 and the source of the switch tube Q8; a diode D12 is provided at the other end of the second winding 32; a capacitor C17 and a resistor R16 are provided between the diode D12 and one end of the second winding 32.

[0048] Specifically, this embodiment can further enhance the stability of the power supply circuit through the above configuration.

[0049] In the power supply circuit for a three-phase Vienna rectifier control system described in this embodiment, a resistor R17 is provided between the gate of the switch tube Q7 and the output end of the main control module U1; the drain of the switch tube Q7 is connected to the other end of the first winding 31; a diode D10 is provided at the drain of the switch tube Q7; a resistor R14 and a capacitor C14 are provided between the diode D10 and one end of the first winding 31. Specifically, this embodiment can further enhance the stability of the power supply circuit through the above-mentioned settings.

[0050] The power supply circuit applied to a three-phase Vienna rectifier control system described in this embodiment, the transformer circuit also includes a detection resistor R21, a resistor R18 and a resistor R19; the main control module U1 is provided with a first detection end; the source of the switch tube Q7 is grounded through the detection resistor R21; the source of the switch tube Q7 is connected to the first detection end through the resistor R19; the source of the switch tube Q7 is connected to the gate of the switch tube Q7 through the resistor R18.

[0051] Specifically, when the switch tube Q7 is turned on, a current is generated between the positive output port 1, the switch tube Q7 and the detection resistor R21, which is converted into a voltage signal under the action of the detection resistor R21 and transmitted to the main control module U1, so that the power supply circuit can perform current loop regulation of the first winding 31.

[0052] The power supply circuit applied to a three-phase Vienna rectifier control system described in this embodiment, the transformer circuit also includes a detection transformer T3 and a resistor R31; one end of the primary side of the detection transformer T3 is connected to the negative output port 2; the other end of the primary side of the detection transformer T3 is connected to the source of the switch tube Q8; one end of the secondary side of the detection transformer T3 is grounded; the other end of the secondary side of the detection transformer T3 is connected to the first detection end; the resistor R31 is arranged between the two ends of the secondary side of the detection transformer T3.

[0053] Specifically, when the switch tube Q7 is turned on, a current is generated between the second winding 32, the switch tube Q8, the detection transformer T3 and the negative output port 2. The detection transformer T3 now forms a function similar to a current transformer, so that an isolated current is formed between the detection transformer T3 and the resistor R31, which is converted into a voltage signal under the action of the resistor R31 and transmitted to the main control module U1, so that the power supply circuit can perform current loop regulation of the second winding 32.

[0054] In the power supply circuit for a three-phase Vienna rectifier control system described in this embodiment, the main control module U1 is provided with a second detection terminal; the voltage conversion circuit also includes an optical coupler U2 and a resistor R23; the output terminal of the auxiliary power supply module 52 is connected to the input terminal of the optical coupler U2 through the resistor R23; the output terminal of the optical coupler U2 is connected to the second detection terminal. Through the above settings, the output terminal of the auxiliary power supply module 52 transmits the voltage signal to the main control module U1 through the resistor R23 and the optical coupler U2, thereby forming a voltage loop regulation.

[0055] The power supply circuit of the present embodiment is applied to a three-phase Vienna rectifier control system, wherein the three-phase Vienna rectifier includes an input interface 41, a diode module 42, an inductor module 43 and a switch tube module 44;

[0056] The input interface 41 is connected to one end of the inductor module 43; the other end of the inductor module 43 is connected to the input end of the switch tube module 44; the output end of the switch tube module 44 is arranged between the capacitor C3 and the capacitor C7; one end of the capacitor C3 and one end of the capacitor C7 are respectively connected to the other end of the inductor module 43 through the diode module 42.

[0057] The power supply circuit described in this embodiment is applied to a three-phase Vienna rectifier control system, and the transformer circuit also includes an operational amplifier U3; the operational amplifier U3 is connected to the input end of the optical coupler U2; the above setting facilitates the adjustment of the reference parameter value of the optical coupler U2.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A power supply circuit for a three-phase Vienna rectifier control system, characterized in that: It comprises a three-phase Vienna rectifier and a transformer circuit; the three-phase Vienna rectifier comprises a capacitor C3 and a capacitor C7; one end of the capacitor C3 is provided with a positive output port (1); one end of the capacitor C7 is provided with a negative output port (2); the other end of the capacitor C3 and the other end of the capacitor C7 are both grounded; The voltage conversion circuit comprises a main control module U1, a switch tube Q7, a switch tube Q8, a transformer T1, an output module (51) and an auxiliary power supply module (52); The primary side of the transformer T1 is provided with a first winding (31) and a second winding (32); the secondary side of the transformer T1 is provided with a third winding (33) and a fourth winding (34); The control end of the switch tube Q7 and the control end of the switch tube Q8 are respectively connected to the output end of the main control module U1; one end of the first winding (31) is connected to the positive output port (1); the other end of the first winding (31) is grounded through the switch end of the switch tube Q7; one end of the second winding (32) is grounded; the other end of the second winding (32) is connected to the negative output port (2) through the switch end of the switch tube Q8; The output module (51) and the auxiliary power supply module (52) are respectively connected to the third winding (33) and the fourth winding (34).

2. A power supply circuit for a three-phase Vienna rectifier control system according to claim 1, characterized in that: The switch tube Q7 and the switch tube Q8 are both MOS tubes.

3. A power supply circuit for a three-phase Vienna rectifier control system according to claim 2, characterized in that: The voltage conversion circuit also includes a pulse transformer T2; a resistor R25 is provided between one end of the primary side of the pulse transformer T2 and the output end of the main control module U1; the other end of the primary side of the pulse transformer T2 is grounded; One end of the secondary side of the pulse transformer T2 is connected to the negative output port (2); a resistor R26 is provided between the other end of the secondary side of the pulse transformer T2 and the gate of the switch tube Q8; One end of the secondary side of the pulse transformer T2 is connected to the source of the switch tube Q8; The drain of the switch tube Q8 is connected to the other end of the second winding (32).

4. A power supply circuit for a three-phase Vienna rectifier control system according to claim 2, characterized in that: A voltage regulator tube D13 is provided between the drain of the switch tube Q8 and the source of the switch tube Q8; a resistor R28 is provided between the drain of the switch tube Q8 and the source of the switch tube Q8; A diode D12 is provided at the other end of the second winding (32); a capacitor C17 and a resistor R16 are provided between the diode D12 and one end of the second winding (32).

5. The power supply circuit applied to a three-phase Vienna rectifier control system according to claim 2, characterized in that: A resistor R17 is provided between the gate of the switch tube Q7 and the output end of the main control module U1; the drain of the switch tube Q7 is connected to the other end of the first winding (31); a diode D10 is provided at the drain of the switch tube Q7; and a resistor R14 and a capacitor C14 are provided between the diode D10 and one end of the first winding (31).

6. A power supply circuit for a three-phase Vienna rectifier control system according to claim 5, characterized in that: The voltage conversion circuit also includes a detection resistor R21, a resistor R18 and a resistor R19; the main control module U1 is provided with a first detection end; the source of the switch tube Q7 is grounded through the detection resistor R21; the source of the switch tube Q7 is connected to the first detection end through the resistor R19; the source of the switch tube Q7 is connected to the gate of the switch tube Q7 through the resistor R18.

7. The power supply circuit for a three-phase Vienna rectifier control system according to claim 6, characterized in that: The voltage conversion circuit also includes a detection transformer T3 and a resistor R31; one end of the primary side of the detection transformer T3 is connected to the negative output port (2); the other end of the primary side of the detection transformer T3 is connected to the source of the switch tube Q8; one end of the secondary side of the detection transformer T3 is grounded; the other end of the secondary side of the detection transformer T3 is connected to the first detection end; the resistor R31 is arranged between the two ends of the secondary side of the detection transformer T3.

8. The power supply circuit for a three-phase Vienna rectifier control system according to claim 1, characterized in that: The main control module U1 is provided with a second detection end; the voltage conversion circuit also includes an optical coupler U2 and a resistor R23; the output end of the auxiliary power supply module (52) is connected to the input end of the optical coupler U2 through the resistor R23; the output end of the optical coupler U2 is connected to the second detection end.

9. The power supply circuit for a three-phase Vienna rectifier control system according to claim 1, characterized in that: The three-phase Vienna rectifier comprises an input interface (41), a diode module (42), an inductor module (43) and a switch tube module (44); The input interface (41) is connected to one end of the inductor module (43); the other end of the inductor module (43) is connected to the input end of the switch tube module (44); the output end of the switch tube module (44) is arranged between the capacitor C3 and the capacitor C7; one end of the capacitor C3 and one end of the capacitor C7 are respectively connected to the other end of the inductor module (43) through the diode module (42).

10. The power supply circuit applied to a three-phase Vienna rectifier control system according to claim 8, characterized in that: The voltage conversion circuit further includes an operational amplifier U3; the operational amplifier U3 is connected to the input end of the optical coupler U2.

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