CN219802165U - Ten thousand-volt high-power high-voltage traction power supply - Google Patents

Abstract

The utility model discloses a ten-thousand-volt high-power high-voltage traction power supply, which comprises an alternating-current soft start circuit and a plurality of rear-stage circuits, wherein one end of the alternating-current soft start circuit is connected with the power supply, the other end of the alternating-current soft start circuit is respectively connected with the input ends of the rear-stage circuits, the rear-stage circuits are sequentially cascaded, the head end and the tail end form the output end of the high-voltage traction power supply, and the rear-stage circuits comprise a voltage transformation module, an uncontrolled rectifying module, a BUCK module and an anti-short circuit module which are sequentially connected; the utility model has the advantages that: the output voltage ripple is small, the voltage adjustment range is large, the current is large, the traction requirement of large current can be met, the damage of a power supply or a loop is avoided, and the risk of fire is avoided.

Description

Ten thousand-volt high-power high-voltage traction power supply

Technical Field

The utility model relates to the field of test power supplies, in particular to a ten-thousand-volt high-power high-voltage traction power supply.

Background

Currently, a market is rising based on a high-power direct-current power supply, and the high-power BUCK/BOOST circuit is more and more commonly applied. At present, manufacturers of domestic semiconductor devices are more and more, and meanwhile, high-voltage and high-current devices are more and more, so that more high-voltage and high-current traction power supplies are needed for burn-in testing. With the development of power electronics technology, high voltage will be developed in the future, and the market will also have more and more demands for high voltage power sources. Many high-voltage power supplies in the existing market are obtained by utilizing an isolated rectifying technology, the output voltage ripple is large, the voltage adjustment range is small, the flexibility is poor, the output current of the high-voltage power supply with more than ten thousand volts is very small, and the traction requirement of large current can not be met by only a few amperes. In the research and development and production process of the power supply, devices are more, the power is higher, the failure of the devices is unavoidable, the power supply or a loop is often damaged, and even the risk of fire is caused.

Disclosure of Invention

The utility model aims to solve the technical problems that the high-voltage power supply in the prior art has large output voltage ripple, small voltage adjustment range and small current, cannot meet the traction requirement of large current, often causes damage to a power supply or a loop, and has the risk of ignition.

The utility model solves the technical problems by the following technical means: the utility model provides a high-power high voltage traction power supply of ten thousand volts level, includes exchanging soft start circuit and a plurality of back level circuit, exchanging soft start circuit's one end and power connection, and the other end is connected with a plurality of back level circuit's input respectively, and a plurality of back level circuit are cascaded in proper order and head end and tail end constitute high voltage traction power supply's output, back level circuit includes the transformation module, uncontrolled rectifier module, BUCK module and the short circuit prevention module of connecting in proper order.

The beneficial effects are that: according to the utility model, the direct-current ripple can be effectively reduced by rectifying the direct-current ripple through the uncontrolled rectifying module, the BUCK module is arranged, and the cascading technology is adopted, so that the output voltage can be effectively increased to over ten thousand volts, meanwhile, the power can be increased, the voltage adjustment range is large, the current is large, the traction requirement of large current is met, in addition, the short-circuit prevention module is arranged, the output short-circuit is avoided, the damage to a power supply or a loop is prevented, and the risk of fire is avoided.

Further, the ten-thousand-volt high-power high-voltage traction power supply further comprises a power-on switch QF1, the power-on switch QF1 comprises three normally-open contacts, one ends of the three normally-open contacts are respectively connected with three phases of the three-phase power supply, and the other ends of the three normally-open contacts are respectively connected with an alternating-current soft start circuit.

Further, the alternating current soft start circuit comprises three soft start units which are respectively connected with the other ends of the three normally open contacts of the power-on switch QF1 in a one-to-one correspondence mode.

Still further, a soft start unit in the alternating current soft start circuit comprises a normally open contact KM1, a normally open contact KM2 and a resistor R16, one end of the resistor R16 and one end of the normally open contact KM1 are connected with the other end of one normally open contact of the power-on switch QF1, the other end of the resistor R16 is connected with one end of the normally open contact KM2, the other end of the normally open contact KM2 is connected with the other end of the normally open contact KM1 and is used as an output end of the soft start unit, and the output end of the soft start unit is connected with a voltage transformation module.

Furthermore, the transformation module is a double-split transformer, the primary side of the double-split transformer is three windings connected end to end in series, connecting points are arranged on connecting lines of adjacent windings, the total of three connecting points are respectively connected with the output ends of the three-way soft start units in a one-to-one correspondence manner; the secondary side of the double-split transformer is provided with six windings, and the three windings are in a group and are mutually connected in parallel.

Furthermore, the uncontrolled rectifying module comprises two uncontrolled rectifying units with the same structure, and the two uncontrolled rectifying units are respectively connected with two groups of windings on the secondary side of the double-split transformer.

Furthermore, one uncontrolled rectifying unit in the uncontrolled rectifying module comprises a three-phase rectifying bridge D1, a capacitor C1 and a resistor R1, wherein the three-phase rectifying bridge D1 is a rectifying bridge formed by 6 diodes, three bridge arms of the three-phase rectifying bridge D1 are respectively and correspondingly connected with one group of windings of the secondary side of the double-split transformer, an anode of the three-phase rectifying bridge D1 is connected with one end of the capacitor C1 and one end of the resistor R1, and a cathode of the three-phase rectifying bridge D1 is connected with the other end of the capacitor C1 and the other end of the resistor R1.

Further, the BUCK module includes transistors Q11 to Q14, an inductor L1, an inductor L2, a capacitor C11, and a resistor R11, where the transistors Q11 to Q14 are all transistors with body diodes, an emitter of the transistor Q11 is connected with a collector of the transistor Q12 and integrally connected in parallel to an output end of one uncontrolled rectifying unit of the uncontrolled rectifying module, an emitter of the transistor Q12 is connected with a collector of the transistor Q13, and an emitter of the transistor Q13 is connected with a collector of the transistor Q14 and integrally connected in parallel to an output end of another uncontrolled rectifying unit of the uncontrolled rectifying module; one end of the inductor L1 is connected with the emitter of the triode Q11, one end of the inductor L2 is connected with the emitter of the triode Q13, one end of the capacitor C11, one end of the resistor R11 and the other end of the inductor L1 are connected, and the other end of the capacitor C11, the other end of the resistor R11 and the other end of the inductor L2 are connected.

Further, the short-circuit prevention module is a diode D11, a cathode of the diode D11 is connected with one end of the resistor R11, and an anode of the diode D11 is connected with the other end of the resistor R11.

Still further, the high-power high-voltage traction power supply of ten thousand volts level still includes thermal relay FT1, fuse F1 and contactor KM3, contactor KM3 includes two normally open contacts, thermal relay FT 1's input is connected with high-voltage traction power supply's output, thermal relay FT 1's output passes through fuse F1 and is connected with one of them normally open contact's of contactor KM3 one end, thermal relay FT 1's output still is connected with another normally open contact's of contactor KM3 one end, the other end output circuit total voltage of two normally open contacts of contactor KM 3.

The utility model has the advantages that:

(1) According to the utility model, the direct-current ripple can be effectively reduced by rectifying the direct-current ripple through the uncontrolled rectifying module, the BUCK module is arranged, and the cascading technology is adopted, so that the output voltage can be effectively increased to over ten thousand volts, meanwhile, the power can be increased, the voltage adjustment range is large, the current is large, the traction requirement of large current is met, in addition, the short-circuit prevention module is arranged, the output short-circuit is avoided, the damage to a power supply or a loop is prevented, and the risk of fire is avoided.

(2) The transformer module adopts a double-split transformer, the transformer isolates a front-end power grid through a three-phase isolation transformer, and meanwhile, the three-phase isolation transformer has a boosting function, has high withstand voltage capability, and the withstand voltage reaches twice of output voltage +1000V.

(3) The uncontrolled rectifying module carries out uncontrolled rectification on the three-phase alternating voltage isolated at the front end, so that a direct voltage of 1050V to 1300V of each path of direct current is obtained.

(4) The BUCK modules convert two paths of high-voltage direct current voltages into controllable direct current outputs, wherein the other paths of BUCK modules adopt a copying wave generation technology and are output in cascade connection, and finally the controllable high-voltage high-current direct current voltage is obtained.

(5) The diode D11 for preventing short circuit can effectively eliminate the short circuit of a back power supply, voltage pulse and current pulse caused by loop inductance reduce peak stress of a lower tube, so that IGBT of the BUCK module is protected from being damaged, and frequent output short circuit can be born.

Drawings

FIG. 1 is a schematic diagram of a high power high voltage traction power supply of the ten thousand volts level disclosed in an embodiment of the present utility model;

fig. 2 is a schematic diagram of a rear stage circuit in a high-power high-voltage traction power supply with a kilovolt level according to an embodiment of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described in the following in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1, a ten-thousand-volt-level high-power high-voltage traction power supply comprises an alternating-current soft start circuit 1 and a plurality of post-stage circuits 2, wherein one end of the alternating-current soft start circuit 1 is connected with a power supply, the other end of the alternating-current soft start circuit is respectively connected with input ends of the plurality of post-stage circuits 2, the plurality of post-stage circuits 2 are sequentially cascaded, the head end and the tail end of the post-stage circuits form an output end of the high-voltage traction power supply, and the post-stage circuits 2 comprise a voltage transformation module, an uncontrolled rectifying module, a BUCK module and a short circuit prevention module which are sequentially connected.

With continued reference to fig. 1, the ten-thousand-volt-level high-power high-voltage traction power supply further comprises a power-on switch QF1, the power-on switch QF1 comprises three normally open contacts, one ends of the three normally open contacts are respectively connected with three phases of the three-phase power supply, and the other ends of the three normally open contacts are respectively connected with the alternating-current soft start circuit 1. QF1 is a power-on switch of the whole system and has short-circuit protection capability.

With continued reference to fig. 1, the ac soft start circuit 1 includes three soft start units, where the three soft start units are respectively connected with the other ends of the three normally open contacts of the power-on switch QF1 in a one-to-one correspondence manner. One path of soft start unit in the alternating current soft start circuit 1 comprises a normally open contact KM1, a normally open contact KM2 and a resistor R16, one end of the resistor R16 and one end of the normally open contact KM1 are connected with the other end of one normally open contact of the power-on switch QF1, the other end of the resistor R16 is connected with one end of the normally open contact KM2, the other end of the normally open contact KM2 is connected with the other end of the normally open contact KM1 and serves as an output end of the soft start unit, and the output end of the soft start unit is connected with a voltage transformation module. The normally open contact KM2 is attracted firstly, the rear-end bus capacitor is precharged through the resistor R16, the resistor R17 and the resistor R18, meanwhile, the transformer is excited by soft start, and the current at the attraction moment of the normally open contact KM1 is reduced. The normally open contact KM2 is attracted after 5S, the normally open contact KM1 is attracted, 1S is attracted after the normally open contact KM1, the normally open contact KM2 is disconnected, and meanwhile, the normally open contact KM1 and the normally open contact KM2 are provided with auxiliary contacts, so that state judgment is carried out on a control system.

Referring to fig. 2, the transformation module is a double-split transformer, the primary side of the double-split transformer is three windings connected end to end in series, connecting points are arranged on connecting lines of adjacent windings, the total of three connecting points are respectively connected with the output ends of the three-way soft start units in a one-to-one correspondence manner; the secondary side of the double-split transformer is provided with six windings, and the three windings are in a group and are mutually connected in parallel. The adoption of the double-split transformer isolates the front-end power grid through the three-phase isolation transformer, meanwhile, the three-phase isolation transformer has the function of boosting, and the three-phase isolation transformer is required to have high withstand voltage capability, and the withstand voltage reaches twice the output voltage +1000V.

With continued reference to fig. 2, the uncontrolled rectifying module includes two uncontrolled rectifying units with the same structure, and the two uncontrolled rectifying units are respectively connected with two groups of windings on the secondary side of the double-split transformer. The three-phase rectifier bridge D1 is a rectifier bridge formed by 6 diodes, three bridge arms of the three-phase rectifier bridge D1 are respectively and correspondingly connected with one group of windings on the secondary side of the double-split transformer, the anode of the three-phase rectifier bridge D1 is connected with one end of the capacitor C1 and one end of the resistor R1, and the cathode of the three-phase rectifier bridge D1 is connected with the other end of the capacitor C1 and the other end of the resistor R1. The uncontrolled rectifying module carries out uncontrolled rectification on the three-phase alternating voltage isolated at the front end, so that a direct voltage of 1050V to 1300V of each path of direct current is obtained.

With continued reference to fig. 2, the BUCK module includes transistors Q11 to Q14, an inductor L1, an inductor L2, a capacitor C11, and a resistor R11, where the transistors Q11 to Q14 are all transistors with body diodes, an emitter of the transistor Q11 is connected with a collector of the transistor Q12 and integrally connected in parallel to an output end of one uncontrolled rectifying unit of the uncontrolled rectifying module, an emitter of the transistor Q12 is connected with a collector of the transistor Q13, and an emitter of the transistor Q13 is connected with a collector of the transistor Q14 and integrally connected in parallel to an output end of another uncontrolled rectifying unit of the uncontrolled rectifying module; one end of the inductor L1 is connected with the emitter of the triode Q11, one end of the inductor L2 is connected with the emitter of the triode Q13, one end of the capacitor C11, one end of the resistor R11 and the other end of the inductor L1 are connected, and the other end of the capacitor C11, the other end of the resistor R11 and the other end of the inductor L2 are connected. In the embodiment, the BUCK module has 5 paths, two paths of high-voltage direct current voltages are converted into controllable direct current outputs through five paths of three levels, and the other four paths of the high-voltage direct current voltages adopt a copying wave generation technology to finally obtain the controllable high-voltage high-current direct current voltage.

With continued reference to fig. 2, the short-circuit prevention module is a diode D11, a cathode of the diode D11 is connected with one end of the resistor R11, and an anode of the diode D11 is connected with the other end of the resistor R11. The anti-reflection diode is added to each output, the diode can effectively eliminate the short circuit of a back-end power supply, voltage pulses and current pulses caused by loop inductance, and peak stress of a lower pipe is reduced, so that IGBT of BUCK is protected from being damaged, and frequent output short circuits can be borne.

Referring to fig. 1, the high-power high-voltage traction power supply of ten thousand volts further includes a thermal relay FT1, a fuse F1 and a contactor KM3, the contactor KM3 includes two normally open contacts, an input end of the thermal relay FT1 is connected with an output end of the high-voltage traction power supply, an output end of the thermal relay FT1 is connected with one end of one of the normally open contacts of the contactor KM3 through the fuse F1, an output end of the thermal relay FT1 is further connected with one end of the other normally open contact of the contactor KM3, and the other ends of the two normally open contacts of the contactor KM3 output a total line voltage. The thermal relay FT1 has the functions of overload protection, overcurrent protection and overheat protection, and when a circuit breaks down or is abnormal, the fuse F1 fuses in time, and cuts off current, so that a certain protection effect is achieved on the electric appliance and the circuit. The contactor KM3 is a switch at the output, through which the total voltage output of the whole line can be controlled.

Through the technical scheme, the high-current and high-voltage output is realized through the cascading technology, so that the high-power output is realized. And set up uncontrolled rectifier module in the circuit and commutate, can effectually reduce direct current ripple, set up BUCK module and adopt cascaded technique, can effectually promote output voltage to ten thousand volts more, can promote power simultaneously, voltage adjustment scope is big, and the electric current is big, satisfies the traction requirement of heavy current, in addition, sets up the short circuit prevention module, avoids the output short circuit to prevent causing power or return circuit damage, avoid the risk of starting a fire.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (10)

1. The utility model provides a ten thousand high-power high-voltage traction power supply of volt level, its characterized in that includes exchanging soft start circuit and a plurality of back level circuit, exchanging soft start circuit's one end and power connection, the other end is connected with a plurality of back level circuit's input respectively, and a plurality of back level circuit cascade in proper order and head end and tail end constitute high-voltage traction power supply's output, back level circuit includes the transformation module, uncontrolled rectifier module, BUCK module and the short circuit prevention module of connecting in proper order.

2. The high-power high-voltage traction power supply with the ten thousand volts level according to claim 1 is characterized by further comprising a power-on switch QF1, wherein the power-on switch QF1 comprises three normally open contacts, one ends of the three normally open contacts are respectively connected with three phases of a three-phase power supply, and the other ends of the three normally open contacts are respectively connected with an alternating-current soft start circuit.

3. The high-power high-voltage traction power supply with the ten thousand volts level according to claim 2, wherein the alternating-current soft start circuit comprises three soft start units which are respectively connected with the other ends of three normally open contacts of the power-on switch QF1 in a one-to-one correspondence manner.

4. A high-power high-voltage traction power supply with a kilovolt level according to claim 3, wherein a soft start unit in the alternating-current soft start circuit comprises a normally open contact KM1, a normally open contact KM2 and a resistor R16, one end of the resistor R16 and one end of the normally open contact KM1 are both connected with the other end of one normally open contact of the power-on switch QF1, the other end of the resistor R16 is connected with one end of the normally open contact KM2, the other end of the normally open contact KM2 is connected with the other end of the normally open contact KM1 and is used as an output end of the soft start unit, and the output end of the soft start unit is connected with a voltage transformation module.

5. The high-power high-voltage traction power supply with the ten thousand volts level according to claim 4 is characterized in that the transformation module is a double-split transformer, the primary side of the double-split transformer is three windings connected end to end in series, connecting points are arranged on connecting lines of adjacent windings, the total of three connecting points are respectively connected with the output ends of three soft start units in a one-to-one correspondence manner; the secondary side of the double-split transformer is provided with six windings, and the three windings are in a group and are mutually connected in parallel.

6. The high-power high-voltage traction power supply with the ten thousand volts level according to claim 5, wherein the uncontrolled rectifying module comprises two uncontrolled rectifying units with the same structure, and the two uncontrolled rectifying units are respectively connected with two groups of windings on the secondary side of the double-split transformer.

7. The high-power high-voltage traction power supply with the ten thousand volts level according to claim 6, wherein one uncontrolled rectifying unit in the uncontrolled rectifying module comprises a three-phase rectifying bridge D1, a capacitor C1 and a resistor R1, the three-phase rectifying bridge D1 is a rectifying bridge formed by 6 diodes, three bridge arms of the three-phase rectifying bridge D1 are respectively connected with a group of windings of the secondary side of the double-split transformer in a one-to-one correspondence manner, an anode of the three-phase rectifying bridge D1 is connected with one end of the capacitor C1 and one end of the resistor R1, and a cathode of the three-phase rectifying bridge D1 is connected with the other end of the capacitor C1 and the other end of the resistor R1.

8. The high-power high-voltage traction power supply with the ten thousand volts according to claim 7 is characterized in that the BUCK module comprises a triode Q11 to a triode Q14, an inductor L1, an inductor L2, a capacitor C11 and a resistor R11, wherein the triode Q11 to the triode Q14 are all triodes with body diodes, an emitter of the triode Q11 is connected with a collector of the triode Q12 and is integrally connected with an output end of one uncontrolled rectifying unit of the uncontrolled rectifying module in parallel, an emitter of the triode Q12 is connected with a collector of the triode Q13, and an emitter of the triode Q13 is connected with a collector of the triode Q14 and is integrally connected with an output end of the other uncontrolled rectifying unit of the uncontrolled rectifying module in parallel; one end of the inductor L1 is connected with the emitter of the triode Q11, one end of the inductor L2 is connected with the emitter of the triode Q13, one end of the capacitor C11, one end of the resistor R11 and the other end of the inductor L1 are connected, and the other end of the capacitor C11, the other end of the resistor R11 and the other end of the inductor L2 are connected.

9. The high-power high-voltage traction power supply with the ten thousand volts level according to claim 8, wherein the short-circuit prevention module is a diode D11, a cathode of the diode D11 is connected with one end of a resistor R11, and an anode of the diode D11 is connected with the other end of the resistor R11.

10. The high-power high-voltage traction power supply with the ten thousand volts level according to claim 9, further comprising a thermal relay FT1, a fuse F1 and a contactor KM3, wherein the contactor KM3 comprises two normally open contacts, the input end of the thermal relay FT1 is connected with the output end of the high-voltage traction power supply, the output end of the thermal relay FT1 is connected with one end of one normally open contact of the contactor KM3 through the fuse F1, the output end of the thermal relay FT1 is also connected with one end of the other normally open contact of the contactor KM3, and the other ends of the two normally open contacts of the contactor KM3 output the total line voltage.