WO2019113907A1

WO2019113907A1 - Power converter based on high voltage thyristor

Info

Publication number: WO2019113907A1
Application number: PCT/CN2017/116307
Authority: WO
Inventors: 刘革莉; 王雷; 陈宏�; 赵国鹏; 赵晨凯; 张丹
Original assignee: 中车永济电机有限公司
Priority date: 2017-12-11
Filing date: 2017-12-15
Publication date: 2019-06-20
Also published as: CN109905040B; CN109905040A

Abstract

A power converter based on a high voltage thyristor, comprising an air cooling radiator (100), a thyristor phase module (V1), and a diode phase module (V2). The thyristor phase module (V1) comprises a first thyristor (S1) and a second thyristor (S2) connected to each other. The diode phase module (V2) comprises a first diode (D1) and a second diode (D2) connected to each other. The connection point between the anode of the first thyristor (S1) and the cathode of the second thyristor (S2) is a first input end (AC-1) of an alternating current power supply, and the connection point between the anode of the first diode (D1) and the cathode of the second diode (D2) is a second input end (AC-2) of the alternating current power supply. The cathode of the first thyristor (S1) and the cathode of the first diode (D1) are also first direct current output ends (DC+), and the anode of the second thyristor (S2) and the anode of the second diode (D2) are also second direct output ends (DC-). The thyristor phase module (V1) and the diode phase module (V2) are both on the upper surface of the air cooling radiator (100). The problems in a power converter of a complicated assembly structure and large volume of the whole apparatus, as well as inconvenience in replacement and maintenance are solved.

Description

High-voltage thyristor-based power converter

Technical field

The present invention relates to a power converter, and more particularly to a power converter based on a high voltage thyristor.

Background technique

The thyristor is a reliable and mature semi-controlled semiconductor power device, especially the flat-type thyristor device, which cooperates with the air-cooled radiator and plays an irreplaceable role in the era of locomotive DC electric drive system. However, since the railway locomotive entered the era of communication, Insulated Gate Bipolar Transistor (IGBT) devices have been widely used and gradually replaced thyristor devices, making thyristor devices basically only used in the civil and low-voltage industries.

However, in some special occasions, the power converter composed of thyristor devices is still selected because of its reliable circuit, strong overload capability, simple triggering and low cost. In the prior art, the power converter of the same circuit topology and voltage level mostly uses a flat thyristor and a diode device.

However, the flat thyristor and the diode are yin and yang, sandwiched between two heat sinks. Since each of the flat thyristors and the diode device is separately installed with two separate heat sinks, the assembly structure of the entire device is complicated and bulky. When the device needs to be replaced, all the heat sinks need to be removed, which is inconvenient to maintain.

Summary of the invention

The invention provides a power converter based on a high-voltage thyristor, which adopts a high-voltage thyristor and a diode phase module device, and cooperates with an air-cooled heat sink to form a full-bridge half-controlled rectifier, which is used to solve the complicated assembly, bulky, inconvenient replacement and maintenance of the entire device. The problem.

The invention provides a power converter based on a high voltage thyristor, comprising: an air cooling radiator, a thyristor phase module, a diode phase module, wherein

The thyristor phase module includes a first thyristor and a second thyristor, an anode of the first thyristor being connected to a cathode of the second thyristor;

The diode phase module includes a first diode and a second diode, and an anode of the first diode is connected to a cathode of the second diode;

a connection point between an anode of the first thyristor and a cathode of the second thyristor is a first input end of an alternating current power source, and a connection point of an anode of the first diode and a cathode of the second diode is a second input end of the alternating current power source;

The cathode of the first thyristor and the cathode of the first diode are respectively a first direct current output, an anode of the second thyristor, and an anode of the second diode are respectively a second direct current Output

The thyristor phase module and the diode phase module are respectively disposed on an upper surface of the air-cooling heat sink.

Optionally, the method further includes: a first resistance module and a second resistance module on an upper surface of the air-cooling heat sink;

The first resistance module includes a first absorption resistor and a third absorption resistor, one end of the first absorption resistor is connected to a cathode of the first thyristor, and the other end of the first absorption resistor is opposite to the first thyristor An anode connection, one end of the third absorption resistor is connected to a cathode of the second thyristor, and the other end of the third absorption resistor is connected to an anode of the second thyristor;

The second resistance module includes a second absorption resistor and a fourth absorption resistor, one end of the second absorption resistor is connected to a cathode of the first diode, and the other end of the second absorption resistor is opposite to the first An anode of the diode is connected, one end of the fourth absorption resistor is connected to the cathode of the second diode, and the other end of the fourth absorption resistor is connected to the anode of the second diode.

Optionally, the method further includes: a first absorbing capacitor, a second absorbing capacitor, a third absorbing capacitor, and a fourth absorbing capacitor on an upper surface of the air-cooling heat sink;

One end of the first absorption capacitor is connected to the other end of the first absorption resistor, and the other end of the first absorption capacitor is connected to an anode of the first thyristor;

One end of the second absorption capacitor is connected to the other end of the second absorption resistor, and the other end of the second absorption capacitor is connected to the anode of the first diode;

One end of the third absorption capacitor is connected to the other end of the third absorption resistor, and the other end of the third absorption capacitor is connected to the anode of the second thyristor;

One end of the fourth absorption capacitor is connected to the other end of the fourth absorption resistor, and the other end of the fourth absorption capacitor is connected to the anode of the second diode.

Optionally, the thyristor phase module and the diode phase module are disposed in parallel, the first resistance module is located at a first side of the thyristor phase module, and the second resistance module is located at a first of the diode phase module On the side, the first side of the thyristor phase module and the first side of the diode phase module are on the same side.

Optionally, the first absorbing capacitor, the second absorbing capacitor, the third absorbing capacitor, and the fourth absorbing capacitor are combined by a mounting board;

A combined capacitor is located between the first side of the thyristor phase module and the resistor module, and the resistor module includes the first resistor module and the second resistor module.

Optionally, the method further includes: connecting the bus bar, the connection bus bar being located above the thyristor phase module and the diode phase module.

Optionally, the method further includes: an input/output support terminal disposed on an upper surface of the air-cooling heat sink, at least part of the connection bus bar being located on the input/output support terminal, the input An output support terminal is used to support the connecting busbar.

Optionally, the method further includes: a support frame, a first pulse output box, a second pulse output box, and a driving control board, the support frame is disposed on an upper surface of the air-cooling heat sink, the first pulse output box, a second pulse output box and a driving control board are disposed on the support frame and located above the connecting bus bar;

a first output end of the first pulse output box is connected to a gate of the first thyristor, and a second output end of the first pulse output box is connected to a cathode of the first thyristor;

The first output end of the second pulse output box is connected to the gate of the second thyristor, and the second output end of the second pulse output box is connected to the cathode of the second thyristor.

The first pulse output box and the second pulse output box are also respectively connected to the drive control board.

Optionally, the driving control board is provided with a signal shaping and interlocking circuit, a power conversion module, a first MOSFET tube and a second MOSFET tube;

a first output end of the signal shaping and interlocking circuit is connected to a gate of the first MOSFET, and a second output end of the signal shaping and interlocking circuit is connected to a gate of the second MOSFET;

a drain of the first MOSFET is connected to a second DC output of the power conversion module, and a source of the first MOSFET is connected to a second input of the first pulse output box; a first input end of a pulse output box is connected to a first DC output end of the power conversion module;

a drain of the second MOSFET is connected to a second DC output of the power conversion module, and a source of the second MOSFET is connected to a second input of the second pulse output box; The first input end of the two-pulse output box is connected to the first DC output end of the power conversion module.

Optionally, a protective cover is disposed on an outer portion of the driving control board.

The high voltage thyristor-based power converter provided by the invention comprises an air cooling radiator, a thyristor phase module and a diode phase module, and the thyristor phase module and the diode phase module are respectively disposed on the upper surface of the air cooling radiator, thereby forming The thyristor phase module and the diode phase module are no longer flat type, and can be conveniently installed. After installation, the overall structure is simple, small in size, good in heat dissipation, and easy to replace and maintain. Due to the insulation of the thyristor phase module and the bottom plate of the diode phase module, It can make good electrical insulation between the devices. In addition, the first thyristor and the second thyristor are connected to each other; the first diode and the second diode are connected to each other; the connection point of the anode of the first thyristor and the cathode of the second thyristor is the first input end of the alternating current power source, a connection point between the anode of the diode and the cathode of the second diode is a second input end of the alternating current power source; the cathode of the first thyristor and the cathode of the first diode are also the first direct current output respectively The anode of the second thyristor and the anode of the second diode are respectively a second DC output terminal, and the single-phase full-bridge half-controlled rectifier circuit formed thereby can rectify the AC voltage input from the auxiliary winding of the traction transformer of the locomotive. The intermediate rated DC voltage is output for use in the auxiliary inverter circuit.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a schematic structural view of a power converter provided by the present invention;

2A is an internal circuit diagram of a thyristor phase module of a power converter according to the present invention;

2B is an internal circuit diagram of a diode phase module of the power converter provided by the present invention;

3 is a circuit diagram of a main circuit of a power converter provided by the present invention;

4 is another schematic structural diagram of a power converter provided by the present invention;

FIG. 5 is still another schematic structural diagram of a power converter according to the present invention; FIG.

FIG. 6 is a circuit diagram of a combined trigger circuit of a power converter according to the present invention.

Description of the reference signs:

V1: thyristor phase module; V2: diode phase module;

100: air-cooled radiator; S1: first thyristor;

S2: a second thyristor; D1: a first diode;

D2: second diode; AC-1: first input end of the alternating current power supply;

AC-2: the second input of the AC power supply; DC+: the first DC output;

DC-: second DC output; Rm1: first resistance module;

Rm2: second resistance module; R1: first absorption resistor;

R2: second absorption resistance; R3: third absorption resistance;

R4: fourth absorption resistor; C1: first absorption capacitor;

C2: second absorption capacitor; C3: third absorption capacitor;

C4: fourth absorption capacitor; 201: connecting the busbar;

202: input and output support terminals; 203: support frame;

300: a first pulse output box; 400: a second pulse output box;

200: drive control board; 204: signal shaping and interlock circuit;

205: power conversion module; Q1: first MOSFET tube;

Q2: a second MOSFET tube;

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

A power converter is an electronic device that converts a certain current into other types of current. There are both DC power conversion and AC power conversion. The power converter uses a power meter to define a product with only a wattage defect for a heat-generating electrical resistor with a "tungsten wire". At present, common power converters include rectified power converters, inverter power converters, chopper power converters, and AC power conversion, which convert power from AC to DC, DC to DC, and DC to AC. And four types of power electronic converters that convert AC to AC.

Power converters are widely used for heating and lighting control, AC and DC power supplies, electrochemical processes, DC and AC electrode drives, static reactive compensation, active harmonic filtering, and more. The power converter is applied to the locomotive, and the AC voltage input by the auxiliary winding of the traction transformer of the locomotive can be rectified, and the intermediate rated DC voltage is output for use by the auxiliary inverter circuit. However, in the prior art, the power converter mostly uses a flat type thyristor and a flat type diode device, so that the assembly structure of the whole device is complicated and bulky, and when the device is damaged and needs to be replaced, all the heat sinks need to be removed, and the maintenance is inconvenient.

The high voltage thyristor based power converter provided by the invention is applied to a locomotive, and aims to solve the above technical problems existing in the prior art. The technical solutions of the present invention and how the technical solutions of the present application solve the above technical problems will be described in detail below with reference to specific embodiments. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 is a schematic structural diagram of a power converter according to the present invention. As shown in FIG. 1, the high-voltage thyristor-based power converter includes an air-cooled heat sink 100, a thyristor phase module V1, and a diode phase module V2.

The thyristor phase module V1 includes a first thyristor S1 and a second thyristor S2, and an anode of the first thyristor S1 is connected to a cathode of the second thyristor S2. 2A is an internal circuit diagram of a thyristor phase module of a power converter according to the present invention, showing an internal circuit of the thyristor phase module V1.

The diode phase module V2 includes a first diode D1 and a second diode D2, and an anode of the first diode D1 is connected to a cathode of the second diode D2. 2B is an internal circuit diagram of a diode phase module of a power converter provided by the present invention, showing an internal circuit of the diode phase module V2.

In the specific design, the thyristor phase module V1 and the diode phase module V2 are selected. The thyristor phase module V1 and the diode phase module V2 are no longer flat type, and can be conveniently installed. The overall structure is simple, small in size and easy to replace after installation. And maintenance. In addition, the use of the thyristor phase module V1 and the diode phase module V2 reduces the number of power devices and reduces the series connection between the power devices, making the power converter usable in a high voltage environment.

The thyristor phase module V1 and the bottom plate of the diode phase module V2 are insulated, and the thyristor phase module V1 and the diode phase module V2 are respectively disposed on the upper surface of the air-cooling heat sink 100, so that there is good electrical insulation between the parts, minus The smaller accessories thus added enable the thyristor phase module V1 and the diode phase module V2 to sufficiently dissipate heat, simplifying the device structure and improving the reliability of the power converter operation.

3 is a circuit diagram of a main circuit of a power converter according to the present invention. As shown in FIG. 3, the circuit is a single-phase full-bridge half-controlled rectifier circuit, wherein the first thyristor S1 and the second in the thyristor phase module V1. The thyristor S2, and the first diode D1 and the second diode D2 in the diode phase module V2 are each a bridge arm of the single-phase full-bridge half-controlled rectifier circuit.

Specifically, the connection point of the anode of the first thyristor S1 and the cathode of the second thyristor S2 is the first input terminal AC-1 of the alternating current power source, and the connection between the anode of the first diode D1 and the cathode of the second diode D2 The second input terminal AC-2 of the AC power source; the cathode of the first thyristor S1 and the cathode of the first diode D1 are also the first DC output terminal DC+, the anode of the second thyristor S2, and the second diode The anode of the tube D2 is also a second DC output terminal DC-.

When the first input AC-1 of the AC power source is the positive half cycle of the sine wave, the second input terminal AC-2 of the AC power source is the negative half cycle of the sine wave. A forward voltage is applied between the anode and the cathode of the first thyristor S1 through the first input terminal AC-1 of the AC power source, and a forward trigger voltage is input between the gate and the cathode of the first thyristor S1. A thyristor S1 is turned on, and outputs a forward DC voltage from the cathode of the first thyristor S1 to the first DC output terminal DC+, and the DC voltage flows through the at least one load to the second DC output terminal DC-, and then passes through the second second The pole tube D2 flows out to the second input terminal AC-2 of the alternating current power source.

Correspondingly, when the first input AC-1 of the AC power source is a negative half cycle of the sine wave, the second input terminal AC-2 of the AC power source is a positive half cycle of the sine wave. The second diode D2 is applied with a forward voltage through the second input terminal AC-2 of the AC power source, the second diode D2 is turned on, and a forward DC voltage is output from the cathode of the second diode D2 to the first a DC output terminal DC+, the DC voltage After at least one load flows to the second DC output terminal DC-, the DC voltage is applied between the anode and the cathode of the second thyristor S2, and a forward trigger voltage is input between the gate and the cathode of the second thyristor S2. The second thyristor S2 is turned on, and an alternating current voltage is output from the cathode of the second thyristor S2 to the second input terminal AC-2 of the alternating current power source.

After the single-phase full-bridge half-controlled rectifier circuit shown in FIG. 3, the AC voltage input from the auxiliary winding of the traction transformer of the locomotive can be rectified, and the intermediate rated DC voltage is output for use by the auxiliary inverter circuit.

The high voltage thyristor-based power converter provided by the embodiment includes an air cooling radiator, a thyristor phase module and a diode phase module, and the thyristor phase module and the diode phase module are respectively disposed on the upper surface of the air cooling radiator, thereby forming The thyristor phase module and the diode phase module are no longer flat type, and can be easily installed. After installation, the overall structure is simple, small in size, good in heat dissipation, and easy to replace and maintain, because the thyristor phase module and the diode phase module are insulated from the bottom plate. It can make good electrical insulation between the devices. In addition, the first thyristor and the second thyristor are connected to each other; the first diode and the second diode are connected to each other; the connection point of the anode of the first thyristor and the cathode of the second thyristor is the first input end of the alternating current power source, a connection point between the anode of the diode and the cathode of the second diode is a second input end of the alternating current power source; the cathode of the first thyristor and the cathode of the first diode are also the first direct current output respectively The anode of the second thyristor and the anode of the second diode are respectively a second DC output terminal, and the single-phase full-bridge half-controlled rectifier circuit formed thereby can rectify the AC voltage input from the auxiliary winding of the traction transformer of the locomotive. The intermediate rated DC voltage is output for use in the auxiliary inverter circuit.

Referring to FIG. 1 , on the basis of the first embodiment, as shown in FIG. 1 , the power converter provided in this embodiment further includes: a first resistance module Rm1 and a first part located on an upper surface of the air-cooling heat sink 100 . Two resistor module Rm2.

Specifically, the first resistor module Rm1 includes a first sink resistor R1 and a third sink resistor R3. Referring to FIG. 3, as shown in FIG. 3, one end of the first sink resistor R1 is connected to the cathode of the first thyristor S1. The other end of the absorption resistor R1 is connected to the anode of the first thyristor S1, one end of the third absorption resistor R3 is connected to the cathode of the second thyristor S2, and the other end of the third absorption resistor R3 is connected to the anode of the second thyristor S2.

The second resistance module Rm2 includes a second absorption resistor R2 and a fourth absorption resistor R4. As shown in FIG. 3, one end of the second absorption resistor R2 is connected to the cathode of the first diode D1, and the second absorption The other end of the resistor R2 is connected to the anode of the first diode D1, one end of the fourth sink resistor R4 is connected to the cathode of the second diode D2, and the other end of the fourth sink resistor R4 is connected to the second diode D2. Anode connection.

4 is another schematic structural diagram of a power converter according to the present invention. Further, as shown in FIG. 4, the power converter further includes: a first snubber capacitor located on an upper surface of the air-cooling heat sink 100. C1, a second absorption capacitor C2, a third absorption capacitor C3, and a fourth absorption capacitor C4.

Specifically, as shown in FIG. 3, one end of the first absorption capacitor C1 is connected to the other end of the first absorption resistor R1, the other end of the first absorption capacitor C1 is connected to the anode of the first thyristor S1, and the second absorption capacitor C2 is One end is connected to the other end of the second absorption resistor R2, the other end of the second absorption capacitor C2 is connected to the anode of the first diode D1; one end of the third absorption capacitor C3 is connected to the other end of the third absorption resistor R3, The other end of the third absorption capacitor C3 is connected to the anode of the second thyristor S2; one end of the fourth absorption capacitor C4 is connected to the other end of the fourth absorption resistor R4, and the other end of the fourth absorption capacitor C4 is connected to the second diode D2. Anode connection.

Connecting the first absorption resistor R1 and the first absorption capacitor C1 in series to form a first resistance-capacitance absorption circuit connected between the anode and the cathode of the first thyristor S1, and charging the first absorption capacitor C1 through the first absorption resistor R1 due to The first absorption resistor R1 acts to increase the impedance, and the first absorption capacitor C1 also equivalently increases the parallel capacitance capacity of the first thyristor S1. For this reason, the voltage surge in which the first thyristor S1 is turned off is suppressed. When the first thyristor S1 is turned on, the first snubber capacitor C1 is discharged through the first thyristor S1, and its discharge current is limited by the first snubber resistor R1. Therefore, the snubber circuit formed by the first snubber resistor R1 and the first snubber capacitor C1 can absorb the spike voltage and energy caused by the phase change of the first thyristor S1 device, and reduce the loss of the first thyristor S1. The remaining absorbing resistors and absorbing capacitors in this embodiment have similar protection principles to the thyristor devices and diode devices connected thereto, and are not described herein again.

Referring to FIG. 1 , as shown in FIG. 1 , the thyristor phase module V1 and the diode phase module V2 of the power converter provided in this embodiment are disposed in parallel, and the first resistor module Rm1 is located on the first side of the thyristor phase module V1, and second. The resistor module Rm2 is located on the first side of the diode phase module V2, and the first side of the thyristor phase module V1 and the first side of the diode phase module V2 are on the same side.

Since the thyristor phase module V1, the diode phase module V2, the first resistance module Rm1, and the second resistance module Rm2 are both located on the upper surface of the air-cooling heat sink 100 of the power converter, The upper surface area of the air-cooling heat sink 100 is limited. For the purpose of regularity and space saving, the setting method provided in this embodiment may be adopted, and the first resistance module Rm1 and the thyristor phase module V1 are made by the setting manner as described in this embodiment. The connection between the second resistor module Rm2 and the diode phase module V2 is more compact and clear, and avoids problems such as long-distance setting of the phase module and the resistor module, and the problem of winding and tying between the connecting wires caused by the long-line connection. In this embodiment, the specific positional relationship between the phase module and the resistor module on the upper surface of the air-cooling heat sink 100 is not limited. In order to realize different functions, the circuit connection relationship may change, and the specific positional relationship may be according to a specific circuit connection relationship. Make further restrictions.

Optionally, based on the foregoing embodiment, the first snubber capacitor C1, the second snubber capacitor C2, the third snubber capacitor C3, and the fourth snubber capacitor C4 in the power converter are integrated by the mounting board.

The integrated capacitor is located between the first side of the thyristor phase module V1 and the resistor module, and the resistor module includes a first resistor module Rm1 and a second resistor module Rm2.

The first absorption capacitor C1, the second absorption capacitor C2, the third absorption capacitor C3, and the fourth absorption capacitor C4 are combined through the mounting board and disposed between the first side of the thyristor phase module V1 and the resistor module, so as to absorb capacitance and absorb The connection between the resistor, the thyristor and the diode is more convenient, the connection relationship is more clearly visible, and the arrangement of the components on the air-cooled heat sink 100 is more regular.

Optionally, the first snubber capacitor C1, the second snubber capacitor C2, the third snubber capacitor C3, and the fourth snubber capacitor C4 may be packaged as one body, disposed between the first side of the thyristor phase module V1 and the resistor module, so that the package Each of the capacitor components inside is not easily damaged. The mounting form of the above absorbing capacitor is not specifically limited herein.

FIG. 5 is a schematic structural diagram of a power converter according to the present invention. On the basis of the foregoing embodiment, as shown in FIG. 5, the power converter provided in this embodiment further includes: a connection busbar 201, and a connection busbar. 201 is located above the thyristor phase module V1 and the diode phase module V2.

The surface of the connection bus bar 201 is insulated and acts as a wire in the power converter for electrical connection of the main circuit. At the same time, the insulating surface of the busbar 201 is connected to electrically insulate the devices connected thereto.

Referring to FIG. 5, as shown in FIG. 5, the power converter provided in this embodiment further includes: an input/output support terminal 202, and the input/output support terminal 202 is disposed on the air-cooled heat sink. At the upper surface of 100, at least a portion of the connection busbar 201 is located on the input-output support terminal 202, and the input-output support terminal 202 is used to support the connection busbar 201.

The input/output support terminal 202 is located at an edge of the upper surface of the air-cooling heat sink 100, and is insulated from the air-cooling heat sink 100, and can be symmetrically disposed on the opposite sides of the upper surface of the air-cooling heat sink 100, and the connecting bus bar 201 located thereon is fixed. Support to achieve a stable electrical connection to the main circuit.

The connection between the input/output support terminal 201 and the air-cooling heat sink 100 and the connection bus bar 201 can be realized by at least one of a bolt, a screw, a stud, etc., and the embodiment does not specifically limited.

Referring to FIG. 3, on the basis of the foregoing embodiment, as shown in FIG. 3, further comprising: a support frame 203 disposed on the upper surface of the air-cooling heat sink 100.

FIG. 6 is a circuit diagram of a combined trigger circuit of a power converter according to the present invention. As shown in FIG. 6, the power converter provided in this embodiment further includes: a first pulse output box 300, a second pulse output box 400, and The drive control board 200, the first pulse output box 300 and the second pulse output box 400, and the drive control board 200 are disposed on the support frame 203 and above the connection bus 201.

The support frame 203 may be symmetrically disposed on opposite sides of the upper surface of the air-cooling heat sink 100 for supporting the first pulse output box 300, the second pulse output box 400, and the drive control board 200, and the support frame 203 is connected thereto. The connection between the components can be achieved by at least one of a bolt, a screw, a stud, or the like. The connection manner is not specifically limited in this embodiment.

The combination trigger circuit of the power converter provided in this embodiment is connected to the main circuit shown in FIG. 3 through the first thyristor S1 and the second thyristor S2. The specific connection relationship is as follows:

The first output terminal G1 of the first pulse output box 300 is connected to the gate of the first thyristor S1, the second output terminal K1 of the first pulse output box 300 is connected to the cathode of the first thyristor S1, and the second pulse output box 400 is The first output terminal G2 is connected to the gate of the second thyristor S2, and the second output terminal K2 of the second pulse output box 400 is connected to the cathode of the second thyristor S2.

The first pulse output box 300 and the second pulse output box 400 are also connected to the drive control board 200, respectively.

In a possible implementation manner, the first pulse output box 300 and the second pulse output box 400 converts and shapes the square wave pulse signal outputted by the driving control board 200 into a trigger voltage and current suitable for the first thyristor S1 and the second thyristor S2, and triggers the reliable conduction.

Further, as shown in FIG. 6, the drive control board 200 of the power converter is provided with a signal shaping and interlocking circuit 204, a power conversion module 205, a first MOSFET tube Q1 and a second MOSFET tube Q2. The specific connection relationship is as follows:

The first output of the signal shaping and interlocking circuit 204 is connected to the gate of the first MOSFET Q1, and the second output of the signal shaping and interlocking circuit 204 is connected to the gate of the second MOSFET Q2; the first MOSFET The drain of Q1 is connected to the second DC output of the power conversion module 205, and the source of the first MOSFET Q1 is connected to the second input F1 of the first pulse output box 300; the first input of the first pulse output box 300 The terminal E1 is connected to the first DC output terminal of the power conversion module 205; the drain of the second MOSFET transistor Q2 is connected to the second DC output terminal of the power conversion module 205, and the source and the second pulse output of the second MOSFET transistor Q2 are connected. The second input terminal F2 of the box 400 is connected; the first input terminal E2 of the second pulse output box 400 is connected to the first DC output terminal of the power conversion module 205.

In a specific implementation, the drive control board 200 receives the thyristor upper and lower arm drive control signals from the control unit through four ports INA+, INA-, INB+, and INB as shown in FIG. 6, and the signal shaping and interlocking circuit 204 The control signal is processed, and the received control signal is a square wave signal, whereby the first MOSFET Q1 and the second MOSFET Q2 can be controlled to be turned on and off, due to the first MOSFET Q1 and the second MOSFET The connection between Q2 and the power conversion module 205, the first pulse output box 300, and the second pulse output box 400 can add a voltage from ±15V to ±24V to the first pulse output box 300 and the second pulse output box 400. Upper, thereby generating current and voltage signals suitable for use by the first thyristor S1 and the second thyristor S2.

Optionally, a protective cover is disposed on the outside of the driving control board 200 in the power converter provided in this embodiment.

The protective cover allows the power conversion module 205, the first MOSFET tube Q1, and the second MOSFET tube Q2 on the drive control board 200 to be in a closed environment, so that the devices on the drive control board 200 are isolated from dust while being protected from sunlight. The direct photos are guaranteed to ensure their service life.

The high voltage thyristor based power converter provided by the invention adopts forced air cooling, The laminated structure design adopts an air-cooled heat sink as a mounting substrate, and a thyristor phase module, a diode phase module and a resistance module with a large heat generation surface are mounted on the surface of the heat sink substrate, and a thyristor and a diode phase module constitute a main power circuit of the power converter; The layer is the connection busbar between the electrodes of the power device to realize electrical connection; the output pulse box, the drive control board and other components are installed on the upper layer through the support frame, which saves space, and is convenient for debugging and maintenance of parts. The invention adopts a high-voltage phase module thyristor device to form a single-phase full-bridge half-controlled rectifier circuit, so that the power converter has high integration degree, simple overall structure and reduced accessories, thereby reducing the volume and weight of the power converter and meeting the demand of the locomotive.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

A high-voltage thyristor-based power converter, comprising: an air-cooled heat sink, a thyristor phase module, and a diode phase module, wherein

The thyristor phase module includes a first thyristor and a second thyristor, an anode of the first thyristor being connected to a cathode of the second thyristor;

The diode phase module includes a first diode and a second diode, and an anode of the first diode is connected to a cathode of the second diode;

a connection point between an anode of the first thyristor and a cathode of the second thyristor is a first input end of an alternating current power source, and a connection point of an anode of the first diode and a cathode of the second diode is a second input end of the alternating current power source;

The cathode of the first thyristor and the cathode of the first diode are respectively a first direct current output, an anode of the second thyristor, and an anode of the second diode are respectively a second direct current Output

The thyristor phase module and the diode phase module are respectively disposed on an upper surface of the air-cooling heat sink.
The power converter according to claim 1, further comprising: a first resistance module and a second resistance module on an upper surface of the air-cooling heat sink;

The first resistance module includes a first absorption resistor and a third absorption resistor, one end of the first absorption resistor is connected to a cathode of the first thyristor, and the other end of the first absorption resistor is opposite to the first thyristor An anode connection, one end of the third absorption resistor is connected to a cathode of the second thyristor, and the other end of the third absorption resistor is connected to an anode of the second thyristor;

The second resistance module includes a second absorption resistor and a fourth absorption resistor, one end of the second absorption resistor is connected to a cathode of the first diode, and the other end of the second absorption resistor is opposite to the first An anode of the diode is connected, one end of the fourth absorption resistor is connected to the cathode of the second diode, and the other end of the fourth absorption resistor is connected to the anode of the second diode.
The power converter according to claim 2, further comprising: a first absorption capacitor, a second absorption capacitor, a third absorption capacitor, and a fourth absorption capacitor on an upper surface of the air-cooling heat sink;

One end of the first absorption capacitor is connected to the other end of the first absorption resistor, and the other end of the first absorption capacitor is connected to an anode of the first thyristor;

One end of the second absorption capacitor is connected to the other end of the second absorption resistor, and the other end of the second absorption capacitor is connected to the anode of the first diode;

One end of the third absorption capacitor is connected to the other end of the third absorption resistor, and the other end of the third absorption capacitor is connected to the anode of the second thyristor;

One end of the fourth absorption capacitor is connected to the other end of the fourth absorption resistor, and the other end of the fourth absorption capacitor is connected to the anode of the second diode.
The power converter according to claim 3, wherein said thyristor phase module and said diode phase module are disposed in parallel, said first resistance module being located on a first side of said thyristor phase module, said second The resistance module is located on a first side of the diode phase module, and the first side of the thyristor phase module is on the same side as the first side of the diode phase module.
The power converter according to claim 4, wherein the first absorption capacitor, the second absorption capacitor, the third absorption capacitor, and the fourth absorption capacitor are integrated by a mounting board;

A combined capacitor is located between the first side of the thyristor phase module and the resistor module, and the resistor module includes the first resistor module and the second resistor module.
The power converter of claim 3 further comprising: a connection busbar, said connection busbar being located above said thyristor phase module and said diode phase module.
The power converter according to claim 6, further comprising: an input/output support terminal, the input/output support terminal being disposed on an upper surface of the air-cooling heat sink, at least a portion of the connection busbar being located The input/output support terminal is configured to support the connection busbar.
The power converter according to claim 6, further comprising: a support frame, a first pulse output box, a second pulse output box, and a drive control board, wherein the support frame is disposed on the air-cooled heat sink The upper pulse output box, the second pulse output box, and the driving control board are disposed on the support frame and located above the connecting bus bar;

a first output end of the first pulse output box is connected to a gate of the first thyristor, a second output end of the first pulse output box is connected to a cathode of the first thyristor;

The first output end of the second pulse output box is connected to the gate of the second thyristor, and the second output end of the second pulse output box is connected to the cathode of the second thyristor.

The first pulse output box and the second pulse output box are also respectively connected to the drive control board.
The power converter according to claim 7, wherein the driving control board is provided with a signal shaping and interlocking circuit, a power conversion module, a first MOSFET tube and a second MOSFET tube;

a first output end of the signal shaping and interlocking circuit is connected to a gate of the first MOSFET, and a second output end of the signal shaping and interlocking circuit is connected to a gate of the second MOSFET;

a drain of the first MOSFET is connected to a second DC output of the power conversion module, and a source of the first MOSFET is connected to a second input of the first output pulse box; a first input end of a pulse output box is connected to a first DC output end of the power conversion module;

a drain of the second MOSFET is connected to a second DC output of the power conversion module, and a source of the second MOSFET is connected to a second input of the second pulse output box; The first input end of the two-pulse output box is connected to the first DC output end of the power conversion module.
The power converter according to claim 7, wherein the outside of the drive control board is provided with a protective cover.