CN114157161B

CN114157161B - Single-phase inverter applied to railway vehicle

Info

Publication number: CN114157161B
Application number: CN202111483379.2A
Authority: CN
Inventors: 施濠泷; 刘啸; 孙培根
Original assignee: Nanjing Zhizhuo Electronic Technology Co ltd
Current assignee: Nanjing Zhizhuo Electronic Technology Co ltd
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2024-04-19
Anticipated expiration: 2041-12-07
Also published as: CN114157161A

Abstract

The invention discloses a single-phase inverter applied to a rail vehicle, which belongs to the technical field of rail traffic and comprises a single-phase inverter front-stage phase-shifting full-bridge DC/DC conversion circuit and a single-phase inverter rear-stage power IPM inversion circuit, and solves the technical problem that a single-phase 220V power supply cannot be provided after the vehicle is off line at present.

Description

Single-phase inverter applied to railway vehicle

Technical Field

The invention belongs to the technical field of rail transit, and relates to a single-phase inverter applied to a rail vehicle.

Background

At present, a rail vehicle-mounted single-phase 220V power supply is commonly obtained by transforming the voltage at the rear end of a three-phase inverter through a single-phase power frequency transformer or obtaining power from a high-voltage bus through a DC/AC converter, but the two modes are both required to ensure that the network voltage of a contact network is normal and the vehicle is operated on line, and when the vehicle needs to be taken off line for maintenance and overhaul, the single-phase 220V power supply cannot be provided, so that a plurality of devices which need to be powered by the power supply cannot be used under the condition.

Disclosure of Invention

The invention aims to provide a single-phase inverter applied to a railway vehicle, which solves the technical problem that the existing vehicle cannot provide a single-phase 220V power supply after being off line.

In order to achieve the above purpose, the invention adopts the following technical scheme:

The single-phase inverter applied to the railway vehicle comprises a single-phase inverter front-stage phase-shifting full-bridge DC/DC conversion circuit and a single-phase inverter rear-stage power IPM inverter circuit, wherein the single-phase inverter front-stage phase-shifting full-bridge DC/DC conversion circuit is electrically connected with the single-phase inverter rear-stage power IPM inverter circuit;

The single-phase inverter front-stage phase-shifting full-bridge DC/DC conversion circuit comprises an input EMI filter circuit, a precharge circuit, a primary over-current detection circuit, a phase-shifting full-bridge DC/AC inverter circuit, an AC/DC full-bridge rectification circuit and a front-stage auxiliary power circuit, wherein the input end of the input EMI filter circuit is connected with an external power supply, the output end of the input EMI filter circuit is connected with the precharge circuit, the precharge circuit is connected with the primary over-current detection circuit, the primary over-current detection circuit is connected with the phase-shifting full-bridge DC/AC inverter circuit, the phase-shifting full-bridge DC/AC inverter circuit is connected with the AC/DC full-bridge rectification circuit, and the front-stage auxiliary power circuit supplies power for the input EMI filter circuit, the precharge circuit, the primary over-current detection circuit, the phase-shifting full-bridge DC/AC inverter circuit and the AC/DC full-bridge rectification circuit;

The single-phase inverter rear-stage power IPM inverter circuit comprises an intermediate-stage energy storage filter circuit, a power IPM inverter circuit, a PWM wave RC filter circuit, an alternating-current output LC filter circuit, an alternating-current output voltage current acquisition circuit and a rear-stage auxiliary power supply circuit, wherein the input end of the power IPM inverter circuit is connected with an AC/DC full-bridge rectifier circuit, the PWM wave RC filter circuit and the alternating-current output LC filter circuit are both connected with the power IPM inverter circuit, the intermediate-stage energy storage filter circuit is connected with the input end of the power IPM inverter circuit, the alternating-current output voltage current acquisition circuit is connected with the alternating-current output LC filter circuit, and the rear-stage auxiliary power supply circuit supplies power for the power IPM inverter circuit, the PWM wave RC filter circuit, the alternating-current output LC filter circuit and the alternating-current output voltage current acquisition circuit.

Preferably, the input EMI filter circuit includes a varistor ZV1, a common-mode capacitor CY4, a common-mode capacitor CY5, a common-mode capacitor CY6, a common-mode capacitor CY7, a differential-mode capacitor CX2, a differential-mode capacitor CX3, a common-mode inductor L3, a resistor R48, and a resistor R49, wherein a 1 pin and a 4 pin of the common-mode inductor L3 are respectively connected with a positive voltage end and a negative voltage end of an external power supply, a2 pin is connected with the precharge circuit, and a 3 pin outputs a voltage VPP;

the piezoresistor ZV1 is connected in parallel between the 1 pin and the 4 pin of the common mode inductor L3, the 1 pin of the common mode inductor L3 is connected to the ground wire through the common mode capacitor CY6, the 4 pin of the common mode inductor L3 is connected to the ground wire through the common mode capacitor CY7, and the differential mode capacitor CX3 is connected in parallel between the 1 pin and the 4 pin of the common mode inductor L3;

The 2 feet of the common mode inductance L3 are connected with the 3 feet of the common mode inductance L3 through a resistor R48 and a resistor R49 which are connected in series, a differential mode capacitor CX2 is further connected between the 2 feet and the 3 feet of the common mode inductance L3, the 2 feet of the common mode inductance L3 are connected with a ground wire through a common mode capacitor CY4, and the 3 feet of the common mode inductance L3 are connected with the ground wire through a common mode capacitor CY 5.

Preferably, the precharge circuit comprises a fuse F1, a precharge thermistor R23, an input anti-reflection diode D5 and a relay K1, wherein a2 pin of the common mode inductor L3 is connected with a normally open end of the relay K1 through the fuse F1, a public end of the relay K1 is connected with a primary side overcurrent detection circuit, an anode of the diode D5 is connected with the normally open end of the relay K1 through the precharge thermistor R23, a cathode of the diode D5 is connected with the public end of the relay K1, and a coil of the relay K1 is controlled by an external 15V power supply.

Preferably, the primary side overcurrent detection circuit comprises a current transformer T1, a resistor R8, a diode DS, a diode D6, a diode D9, a diode D10, a resistor R24, a resistor R25, a resistor R28, a resistor R30, a resistor R33, a resistor R40, a capacitor C34, a triode Q6, a triode Q7, a triode Q8, a triode Q3, a capacitor C31, a capacitor C32, a capacitor C35, a capacitor C33, a resistor R46, a resistor R34, a resistor R35, a resistor R36, a resistor R27, a resistor R45, a resistor R47 and an LED lamp D12, wherein the current transformer T1 is arranged at a common end of the relay K1 and is used for measuring a current signal output by the common end of the relay K1, a pin 3 of the current transformer T1 is connected with the common end of the relay K1, a pin 8 is connected with the full-bridge DC/AC inverter circuit, a pin 5 of the current transformer T1 is connected with an anode of the diode DS, a pin 6 is connected with a ground wire, a pin R8 is connected with a resistor C35, a resistor R6 is connected with a resistor D6, a base of the current transformer T1 is connected between the positive electrode and a diode D10 of the diode D6, and a negative electrode of the diode D10 is connected with the positive electrode D10 of the diode D10 through the diode D10, and the positive electrode of the diode D10 is connected with the positive electrode D9 of the diode D10 in parallel between the resistor D6 and the positive electrode of the diode D6 of the resistor D6;

The connection node of the resistor R30 and the resistor R33 is also connected with a ground wire through a resistor R40, the emitter electrode of the triode Q6 is connected with the ground wire, the collector electrode of the triode Q7 is connected with the base electrode of the triode Q7 through a resistor R42, the emitter electrode of the triode Q7 is connected with the emitter electrode of the triode Q3, and the collector electrode is connected with a current detection protection pin IB3 of an external power supply control chip;

The base electrode of the triode Q3 is connected with the collector electrode of the triode Q8 through a resistor R35, the collector electrode of the triode Q8 is also connected with the collector electrode of the triode Q6, the collector electrode of the triode Q3 is connected with the base electrode of the triode Q8 through a resistor R36, the emitter electrode of the triode Q8 is connected with a ground wire, the collector electrode of the triode Q3 is also connected with the ground wire through a capacitor C33, the negative electrode of the LED lamp D12 is connected with the ground wire, and the positive electrode is connected with the collector electrode of the triode Q3 through a resistor R45;

Resistor R47 and capacitor C35 all connect in parallel between the base and the ground of triode Q8, and capacitor C32 and resistor R34 all connect in parallel between triode Q7's projecting pole and base, and resistor R27 and capacitor C31 all connect in parallel between triode Q3's projecting pole and base, and triode Q3's projecting pole still is connected with outside 15V power.

Preferably, the phase-shifting full-bridge DC/AC inverter circuit comprises a power switch Q1, a power switch Q2, a power switch Q3, a power switch Q4, a power switch Q5, a driving transformer T2, a driving transformer T3, a resistor R6, a resistor R9, a resistor R21, a resistor R26, a resistor R31, a resistor R37, a resistor R38, a resistor R39, a capacitor C29, a resistor R11, a resistor R10, a capacitor C15, a capacitor C21, a capacitor C22, a capacitor C36, a capacitor C17, a capacitor C18, a capacitor C16, a resistor R4, a resistor R18, a resistor R22, a resistor R29, a resistor R37, a resistor R41, a resistor R44, a resistor R43, a capacitor C30, a resistor R20, a resistor R19, an inductor L1, a diode D7 and a diode D11, the pins 1 and 2 of the driving transformer T2 are connected to an external driving signal, the pins 3 are connected to the G pole of the power switch Q1 through the resistor R6, the pin 4 is connected to the S pole of the power switch Q1, the pin 5 is connected to the power switch Q6 through the power switch Q6, and the Q4 is connected to the Q6, the resistor R9 is connected with the resistor R6 in parallel, the resistor R25 is connected with the resistor R31 in parallel, the resistor R21 is connected between the G pole and the S pole of the power switch tube Q1 in parallel, the resistor R37 is connected between the G pole and the S pole of the power switch tube Q4 in parallel, the S pole of the power switch tube Q1 is connected with the D pole of the power switch tube Q4, the D pole of the power switch tube Q1 is connected with the 8 pin of the current transformer T1, the capacitor C15 is connected with the resistor R10 in series and then is connected between the D pole and the S pole of the power switch tube Q1 in parallel, the resistor R11 is connected with the resistor R10 in parallel, the capacitor C29 is connected with the resistor R39 in series and then is connected between the D pole and the S pole of the power switch tube Q4 in parallel, the S pole of the power switch tube Q1 is connected with the AC/DC full bridge rectifier circuit through the capacitor C21, the capacitor C22 and the capacitor C36 are connected with the capacitor C21 in parallel, the S electrode of the power switch tube Q4 is connected with a ground wire;

The 1 foot and the 2 foot of the driving transformer T3 are connected with external driving signals, the 3 foot is connected with the G pole of the power switch tube Q2 through a resistor R4, the 4 foot is connected with the S pole of the power switch tube Q2, the 5 foot is connected with the S pole of the power switch tube Q5, the 6 foot is connected with the G pole of the power switch tube Q5 through a resistor R32, a resistor R18 is connected with the resistor R4 in parallel, a resistor R29 is connected with the resistor R32 in parallel, the resistor R22 is connected between the G pole and the S pole of the power switch tube Q2 in parallel, the resistor R41 is connected between the G pole and the S pole of the power switch tube Q5 in parallel, the S pole of the power switch tube Q2 is connected with the D pole of the power switch tube Q5, the D pole of the power switch tube Q2 is connected with the 8 foot of the current transformer T1, the capacitor C16 is connected in series with the resistor R19 and then connected between the D pole and the S pole of the power switch tube Q2 in parallel with the resistor R19, the capacitor C30 is connected in series with the resistor R43 and then connected between the D pole and the S pole of the power switch tube Q5 in parallel with the resistor R43, the S pole of the power switch tube Q2 is connected with the AC/DC full bridge rectification circuit through the inductor L1, the 2 pin of the inductor L1 is respectively connected with the positive pole of the diode D7 and the negative pole of the diode D11, the negative pole of the diode D7 is connected with the 8 pin of the current transformer T1, the positive pole of the diode D11 is connected with the ground wire, and the S pole of the power switch tube Q5 is connected with the ground wire.

Preferably, the AC/DC full-bridge rectifier circuit includes a main transformer T4, a main transformer T5, a diode D224, a diode D226, a diode D225, a diode D227, a diode D229, a resistor R216, a resistor R240, a resistor R241, a resistor R242, a resistor R243, a resistor R244, a resistor R245, a resistor R246, an inductor L202, a resistor R275, a resistor R274, a resistor R247, a capacitor C219, a capacitor C220, a capacitor C221, a capacitor C222, a capacitor C224, a resistor R277, a resistor R278, an LED lamp D230, a resistor R279, a capacitor CY204, a capacitor CY205, a capacitor CY206, a capacitor CY10, a capacitor C218 and a resistor R276, wherein the S pole of the power switch Q1 is connected to the 4 pin of the main transformer T5 through a capacitor C21, the S pole of the power switch Q2 is connected to the 1 pin of the main transformer T4 through an inductor L1, the 1 pin of the main transformer T4 is connected to the 1 pin of the main transformer T5, and the main transformer T4 is connected to the main transformer T4;

The diode D224, the diode D226, the diode D225 and the diode D227 form a rectifier bridge, the input end of the rectifier bridge is respectively connected with the 12 pin of the main transformer T4 and the 9 pin of the main transformer T5, one end of the output end is connected with the ground wire through the capacitor CY10 and outputs a-DC power supply, the other end is used for outputting a +DC power supply through the inductor L202, the capacitor C219, the capacitor C220, the capacitor C221, the capacitor C222 and the capacitor C224 are filter capacitor networks between the +DC power supply and the-DC power supply, one end of the rectifier bridge connected with the inductor L202 is also connected with the ground wire through the diode D229 and the capacitor C217, and a discharge resistor network is formed by the resistor R216, the resistor R240, the resistor R241, the resistor R242, the resistor R243, the resistor R244 and the resistor R245 and the resistor R246, and is connected to the cathode of the diode D229;

the +DC power supply outputs DCOUT +power supply through a resistor R275, a resistor R274 and a resistor R247 which are connected in series;

the anode of the LED lamp D230 is connected with a +DC power supply through a resistor R277, a resistor R278 and a resistor R279 which are connected in series, and the cathode is connected with the +DC power supply;

-the DC power supply is ground;

The capacitor CY204, the capacitor CY205 and the capacitor CY206 are filter capacitors on the-DC power supply.

Preferably, the power IPM inverter circuit is composed of an inverter DIPIPM and peripheral circuits thereof, a pin 40 of the inverter DIPIPM is connected with the +dc power supply, and pins 37, 38 and 39 of the inverter DIPIPM are inverter voltage output ends; inverter DIPIPM is used to invert the +dc power supply to AC220V power supply;

the intermediate stage energy storage filter circuit is formed by connecting a capacitor C5, a capacitor C507, a capacitor C510, a capacitor C520 and a capacitor C521 in parallel to form a capacitor filter network, and the capacitor filter network is arranged on a pin 40 of the inverter DIPIPM;

The PWM wave RC filter circuit includes an RC filter formed by a resistor R13 and a capacitor C24, an RC filter formed by a resistor R15 and a capacitor C26, an RC filter formed by a resistor R17 and a capacitor C28, an RC filter formed by a resistor R12 and a capacitor C23, an RC filter formed by a resistor R14 and a capacitor C25, an RC filter formed by a resistor R16 and a capacitor C27, an RC filter formed by a resistor R13 and a capacitor C24, an RC filter formed by a resistor R15 and a capacitor C26, and an RC filter formed by a resistor R17 and a capacitor C28 are respectively provided at pins 1, 7, and 13 of the inverter DIPIPM, an RC filter formed by a resistor R12 and a capacitor C23, and an RC filter formed by a resistor R14 and a capacitor C25, and an RC filter formed by a resistor R16 and a capacitor C27 are respectively provided at pins 27, 28, and 29 of the inverter DIPIPM;

The alternating current output LC filter circuit comprises an inductor L501, a capacitor C524, a capacitor C525, a capacitor C526, a capacitor C527, a capacitor CY502 and a capacitor CY503, wherein the pin 39 of the inverter DIPIPM is connected with the pin 7 of the inductor L501, the pin 8 of the inductor L501 outputs L voltage, the pin 38 of the inverter DIPIPM outputs V3 voltage, the L voltage is connected with a ground wire through the capacitor CY502, the V3 voltage is connected with the ground wire through the capacitor CY503, and the capacitor C524, the capacitor C525, the capacitor C526 and the capacitor C527 form a filter capacitor network between the L voltage and the V3 voltage;

The alternating output voltage and current acquisition circuit comprises a transformer T501, a transformer T502, a resistor R501, a rectifier bridge D501, a resistor R503, a capacitor C514, a capacitor C503, a resistor R505, a capacitor C504, a resistor R507, a resistor R508, an amplifier N501A, a capacitor C515, a diode D504, a diode D503, a resistor R509, a capacitor C505, a rectifier bridge D502, a resistor R504, a capacitor C516, a capacitor C508, a resistor R506, a capacitor C517, a resistor R520, a resistor R521, an amplifier N501B, a capacitor C519, a diode D506, a diode D507, a resistor R512 and a capacitor C509, wherein the primary side of the transformer T501 is connected in series in a loop of L voltage for acquiring current signals in the L voltage loop, the secondary side of the transformer T501 is connected with the input end of the rectifier bridge D501, the positive output end of the rectifier bridge D501 is connected with the 3 pin of the amplifier N501A through a resistor R503, the negative output end of the rectifier bridge D501A is connected with the 2 pin of the amplifier N501A through a resistor R507, a capacitor C514 and a capacitor C503 are filter capacitors of the positive output end of the rectifier bridge D501, one end of the resistor R505 is connected with the 3 pin of the amplifier N501A, the other end of the resistor R505 is connected with the negative output end of the rectifier bridge D501, the 3 pin of the amplifier N501A is connected with a ground wire through a capacitor C504, a resistor R508 is connected between the 2 pin and the 1 pin of the amplifier N501A, the 1 pin of the amplifier N501A is connected with an AD interface AD1 controlled by the resistor R509, the capacitor C515 and the capacitor C505 are filter capacitors of the 1 pin of the amplifier N501A, the positive electrode of the diode D503 is connected with the 1 pin of the amplifier N501A, and the negative electrode of the diode D504 is connected with an external positive power supply;

The primary side of the transformer T502 is connected with L voltage, the other end of the primary side of the transformer T502 is connected with V3 voltage, the secondary side of the transformer T502 is connected with the input end of the rectifier bridge D502, the positive output end of the rectifier bridge D502 is connected with the 5 pin of the amplifier N501B through a resistor R504, the negative output end of the rectifier bridge D502 is connected with the 6 pin of the amplifier N501B through a resistor R520, the capacitor C516 and the capacitor C508 are filter capacitors of the positive output end of the rectifier bridge D502, one end of the resistor R506 is connected with the 5 pin of the amplifier N501B, the other end of the resistor R506 is connected with the negative output end of the rectifier bridge D502, the 5 pin of the amplifier N501B is connected with the ground wire through a capacitor C517, the resistor R521 is connected between the 6 pin and the 7 pin of the amplifier N501B, the 1 pin of the amplifier N501A is connected with the other externally controlled AD interface AD2 through a resistor R512, the capacitor C519 and the capacitor C509 are filter capacitors of the 7 pin of the amplifier N501B, the positive electrode of the diode D506 is connected with the positive power supply, and the negative electrode of the diode D507 is connected with the 7 pin of the amplifier N501B.

Preferably, the pre-stage auxiliary power circuit is composed of an LM201 type voltage stabilizer and a peripheral circuit thereof; the rear auxiliary power circuit is composed of a three-terminal voltage regulator U501 and peripheral circuits thereof.

The invention has the beneficial effects that:

The single-phase inverter applied to the railway vehicle solves the technical problem that the single-phase 220V power supply cannot be provided after the railway vehicle is off line at present, not only can electric isolation be realized, but also the capacity reaches 2.5KVA, the input voltage of the single-phase inverter is adapted to the wide voltage range of a 110V storage battery of the railway vehicle and is DC 80V-140V, the single-phase inverter is particularly suitable for the railway vehicle provided with the 110V grade storage battery, the single-phase 220V alternating current can be obtained by starting the vehicle storage battery when the railway vehicle is off line for maintenance and cleaning and single-phase 220V power supply is required, and compared with the single-phase power frequency transformer and the single-phase power converter which are applied in the market, the single-phase inverter can work without the voltage of a bus of a contact net, and a power supply condition can be created for the vehicle on line for maintenance. Compared with a power frequency transformer, the power frequency transformer has the advantages of smaller volume, lighter weight, voltage stabilizing output capability and various protection functions under the same power, and improves the electricity safety of the vehicle.

Drawings

FIG. 1 is a schematic block diagram of the present invention;

FIG. 2 is a circuit diagram of an EMI filter circuit of the present invention;

FIG. 3 is a circuit diagram of a precharge circuit of the present invention;

FIG. 4 is a circuit diagram of a primary side over-current detection circuit of the present invention;

Fig. 5 is a circuit diagram of a phase-shifted full-bridge DC/AC inverter circuit of the present invention;

Fig. 6 is a circuit diagram of an AC/DC full-bridge rectifier circuit of the invention;

FIG. 7 is a circuit diagram of a pre-stage auxiliary power circuit of the present invention;

FIG. 8 is a circuit diagram of an intermediate stage tank filter circuit of the present invention;

fig. 9 is a circuit diagram of the power IPM inverter circuit of the present invention;

Fig. 10 is a circuit diagram of a PWM wave RC filter circuit of the present invention;

fig. 11 is a circuit diagram of an ac output LC filter circuit of the present invention;

FIG. 12 is a circuit diagram of an AC output voltage current acquisition circuit of the present invention;

fig. 13 is a circuit diagram of the post-stage auxiliary power supply circuit of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The single-phase inverter applied to the railway vehicle as shown in fig. 1-13 comprises a single-phase inverter front-stage phase-shifting full-bridge DC/DC conversion circuit and a single-phase inverter rear-stage power IPM inversion circuit, wherein the single-phase inverter front-stage phase-shifting full-bridge DC/DC conversion circuit is electrically connected with the single-phase inverter rear-stage power IPM inversion circuit;

The piezoresistor ZV1 is used for protecting a later-stage device from breakdown and damage when the input voltage is too high, the common-mode inductor L3 and the common-mode capacitors CY 4-CY 7 are used for inhibiting common-mode interference, the differential-mode capacitors CX2 and CX3 are used for inhibiting differential-mode interference, and R48 and R49 are discharge resistors of the differential-mode capacitors.

The fuse F1 is used to prevent the device and the line from being burned out by a large current when the input side is over-current for a long time. When the input terminal is powered on, in order to prevent the damage caused by instantaneous charging of the bus capacitors (C19 and C20 in FIG. 5) at the rear stage, the intermediate stage capacitor is charged through the current limiting function of R23, and after the intermediate stage capacitor is charged to a proper value, K1 is closed to short the R23, so that the precharge is completed. The input anti-reverse diode D5 plays a role in preventing the power supply damage caused by reverse polarity connection of the input port.

The connection node of the resistor R30 and the resistor R33 is also connected with a ground wire through a resistor R40, the emitter electrode of the triode Q6 is connected with the ground wire, the collector electrode of the triode Q7 is connected with the base electrode of the triode Q7 through a resistor R42, the emitter electrode of the triode Q7 is connected with the emitter electrode of the triode Q3, and the collector electrode is connected with a current detection protection pin IB3 of an external power supply control chip; in this embodiment, the collector of the transistor Q7 provides a current detection protection signal to the external power control chip.

The primary side overcurrent detection circuit is used for detecting primary side short-time overcurrent so as to prevent damage to the power switch tube Q1, the power switch tube Q2, the power switch tube Q4 and the power switch tube Q5. The primary current is collected through the current transformer T1, if the detected current is instantaneously higher than a current protection threshold value, the triode Q6 is conducted, the potential of the CON0 point is pulled down to 0, the triode Q7 is further conducted, the point of the current detection protection pin IB3 of the power supply control chip is pulled up, the power supply control chip stops sending PWM waves after detecting the level, and the power supply stops working. If the detected short-time overcurrent time is long enough, after the CON0 potential is pulled down, the triodes Q3 and Q8 are also turned on successively, after the Q8 is turned on, the CON0 point voltage is pulled down again, because a certain time is needed for discharging the capacitor C35, the CON0 is kept at a low level in the time, the Q3 is still turned on, then the C35 is continuously charged, the Q8 is still kept on, a self-locking circuit is formed in a circulating way, the overcurrent indicator lamp D12 is continuously turned on, and the power supply enters a fault locking state.

The phase-shifting full-bridge DC/AC inverter circuit has the function of inverting the input voltage of 80-140V DC into high-frequency alternating current, and preparing for the subsequent voltage reduction of a transformer, and the working frequency of the circuit is designed to be 65K, so that the volume of each transformer is reduced, and the power density of a power supply is improved. T2 and T3 are driving transformers for isolated driving and amplification of PWM. The power switching tubes Q1, Q2, Q4 and Q5 adopt MOSFETs with 250V/128A/9mΩ class parameters. C17 and C18 are bus absorption capacitances for absorbing bus voltage spikes. C15, C16, C29, C30 and R10, R11, R19, R20, R38, R39, R43, R44 form an RC absorption circuit that absorbs DS voltage spikes for each MOSFET. L1 is resonance inductance, and the junction capacitance of L1 and MOSFET is made to form resonance through phase shift control, so that soft switching is realized to improve power efficiency. C21, C22 and C36 are blocking capacitors, so that magnetic saturation caused by magnetic bias of the transformer in operation is prevented, and failure and damage of a power supply are avoided.

-the DC power supply is ground;

The AC/DC full-bridge rectification circuit rectifies the high-frequency inverted alternating current output by the phase-shift full-bridge DC/AC inversion circuit to obtain intermediate-stage voltage required by the rear-stage power IPM inversion circuit. T4 and T5 are main transformers, the voltage of the AC is boosted by 80-140 Vrms, and then the AC is rectified into DC 330-340V by a full-bridge rectifying circuit formed by D224-D227. The output filter inductance L202 and the capacitors C219-224 form an LC filter circuit for suppressing high-frequency interference, and R216, R240-R246 are intermediate-stage discharge resistors. D230 is an intermediate voltage indicator lamp, CY10, C204-C206 are negative line ground capacitors for eliminating part of common mode interference.

Preferably, the power IPM inverter circuit is composed of an inverter DIPIPM and peripheral circuits thereof, a pin 40 of the inverter DIPIPM is connected with the +dc power supply, and pins 37, 38 and 39 of the inverter DIPIPM are inverter voltage output ends; inverter DIPIPM is used to invert the +dc power supply to AC220V power supply; in this embodiment, the inverter DIPIPM is an in-line intelligent power module.

The power IPM inverter circuit inverts DC 330-340V intermediate-stage voltage obtained by the previous stage conversion into AC220V. Pins 40 are input pins of intermediate-stage voltage, 37-39 are inversion output voltage pins, 1, 7 and 13 are 3-path bridge arm PWM signal input pins, 27, 28 and 29 are 3-path lower bridge arm PWM signal input pins, 19 is an internal bridge arm current detection pin, when a bridge arm has a short circuit or overcurrent fault, the detected overcurrent signal is converted into a voltage signal through an external pull-down resistor RSE and a current limiting resistor R5 to enter into pin 24 for fault judgment, pin 25 is a fault output pin, a high-level signal is sent when the bridge arm short circuit overcurrent or the lower bridge arm driving power supply voltage is insufficient, and the duration of a signal pulse is set through a pull-down capacitor of pin 25. R1-R3, D1-D3, C1-C3, C6-C8 and Z1-Z3 form a bootstrap circuit, after the lower bridge arm is conducted in each switching period, a 15V power supply charges bootstrap capacitors C1, C3 and C7, so that independent power supplies are provided for PWM driving signals of the upper bridge arm at the moment that the upper bridge arm needs to be turned on when the lower bridge arm is turned off, and the driving power supplies of the 3 lower bridge arms adopt the same 15V power supply and the same reference ground.

The PWM wave RC filter circuit eliminates voltage glitches of the driving waveform by RC filtering.

The AC output LC filter circuit is formed by an LC filter network of an output filter inductance L501 and output filter capacitors C524-C527 to filter AC220V, so that the electric energy quality is improved, and the grounding capacitors CY502 and CY503 are used for inhibiting common mode interference at the output side.

Output current is acquired through a current transformer T501, is converted into a voltage signal through R501, and is output to an AD acquisition pin AD1 of the singlechip through a rectifier bridge D501 and a post-stage operational amplifier circuit N501A for output overcurrent protection of the single-phase inverter. The sampling transformer T502 is used for collecting output voltage, and the output voltage is also subjected to rectification by the rectifier bridge D502 and operation by the operational amplifier N501B and then is output to the AD collecting pin AD2 of the singlechip, so that closed-loop operation of the output voltage of the inverter is realized.

The auxiliary power supply circuit of the front-stage phase-shifting full-bridge system mainly adopts a 15W power supply module to build a peripheral circuit and provides power for a front-stage control system.

The rear-stage auxiliary power supply circuit adopts a three-terminal voltage-stabilizing source module to carry out peripheral circuit construction and provides power for a control system of the rear-stage power supply. In this embodiment, the three-terminal regulated power supply module is L7805ABV-DG.

Claims

1. A single-phase inverter for a rail vehicle, characterized by: the single-phase inverter front-stage phase-shifting full-bridge DC/DC conversion circuit is electrically connected with the single-phase inverter rear-stage power IPM inverter circuit;

The single-phase inverter rear-stage power IPM inverter circuit comprises an intermediate-stage energy storage filter circuit, a power IPM inverter circuit, a PWM wave RC filter circuit, an alternating-current output LC filter circuit, an alternating-current output voltage current acquisition circuit and a rear-stage auxiliary power circuit, wherein the input end of the power IPM inverter circuit is connected with an AC/DC full-bridge rectifier circuit, the PWM wave RC filter circuit diagram and the alternating-current output LC filter circuit are both connected with the power IPM inverter circuit, the intermediate-stage energy storage filter circuit is connected with the input end of the power IPM inverter circuit, the alternating-current output voltage current acquisition circuit is connected with the alternating-current output LC filter circuit, and the rear-stage auxiliary power circuit supplies power for the power IPM inverter circuit, the PWM wave RC filter circuit, the alternating-current output LC filter circuit and the alternating-current output voltage current acquisition circuit;

The input EMI filter circuit comprises a piezoresistor ZV1, a common-mode capacitor CY4, a common-mode capacitor CY5, a common-mode capacitor CY6, a common-mode capacitor CY7, a differential-mode capacitor CX2, a differential-mode capacitor CX3, a common-mode inductor L3, a resistor R48 and a resistor R49, wherein a pin 1 and a pin 4 of the common-mode inductor L3 are respectively connected with a positive voltage end and a negative voltage end of an external power supply, a pin 2 is connected with a precharge circuit, and a pin 3 outputs voltage VPP;

The 2 pin of the common mode inductor L3 is connected with the 3 pin of the common mode inductor L3 through a resistor R48 and a resistor R49 which are connected in series, a differential mode capacitor CX2 is also connected between the 2 pin and the 3 pin of the common mode inductor L3, the 2 pin of the common mode inductor L3 is connected with a ground wire through a common mode capacitor CY4, and the 3 pin of the common mode inductor L3 is connected with the ground wire through a common mode capacitor CY 5;

the pre-charging circuit comprises a fuse F1, a pre-charging thermistor R23, an input anti-reflection diode D5 and a relay K1, wherein a pin 2 of the common mode inductor L3 is connected with a normally open end of the relay K1 through the fuse F1, a public end of the relay K1 is connected with a primary side overcurrent detection circuit, an anode of the diode D5 is connected with the normally open end of the relay K1 through the pre-charging thermistor R23, a cathode of the diode D5 is connected with the public end of the relay K1, and a coil of the relay K1 is controlled by an external 15V power supply;

The primary side overcurrent detection circuit comprises a current transformer T1, a resistor R8, a diode DS, a diode D6, a diode D9, a diode D10, a resistor R24, a resistor R25, a resistor R28, a resistor R30, a resistor R33, a resistor R40, a capacitor C54, a triode Q6, a triode Q7, a triode Q8, a triode Q3, a capacitor C31, a capacitor C32, a capacitor C35, a capacitor C33, a resistor R46, a resistor R34, a resistor R35, a resistor R36, a resistor R27, a resistor R45, a resistor R47 and an LED lamp D12, wherein the current transformer T1 is arranged at the common end of the relay K1 and is used for measuring a current signal output by the common end of the relay K1, the 3 pin of the current transformer T1 is connected with the common end of the relay K1, the 8 pin is connected with the phase-shifting full-bridge DC/AC inverter circuit, the 5 pin DS of the positive electrode and the 6 pin of the diode DS is connected with the ground wire, the resistor R8 is connected in parallel between the 5 pin DS and the 6 pin of the resistor T1, the positive electrode DS and the negative electrode of the 6 diode D6 are connected with the positive electrode DS and the negative electrode 10 of the diode D10 through the resistor D10, and the negative electrode DS 10 of the negative electrode DS is connected with the positive electrode 10 of the diode D10 through the resistor D10 and the negative electrode of the diode D10;

The base electrode of the triode Q3 is connected with the collector electrode of the triode Q8 through a resistor R35, the collector electrode of the triode Q8 is also connected with the collector electrode of the triode Q6, the collector electrode of the triode Q3 is connected with the base electrode of the triode Q8 through a resistor R36, the emitter electrode of the triode Q8 is connected with a ground wire, the collector electrode of the triode Q3 is also connected with the ground wire through a capacitor C33, the negative electrode of the LED lamp D12 is connected with the ground wire, and the positive electrode of the LED lamp D is connected with the collector electrode of the triode Q3 through a resistor R45;

2. A single-phase inverter for use in a rail vehicle as defined in claim 1, wherein: the phase-shifting full-bridge DC/AC inverter circuit comprises a power switch tube Q1, a power switch tube Q2, a power switch tube Q4, a power switch tube Q5, a driving transformer T2, a driving transformer T3, a resistor R6, a resistor R9, a resistor R21, a resistor R26, a resistor R31, a resistor R37, a resistor R38, a resistor R39, a capacitor C29, a resistor R11, a resistor R10, a capacitor C15, a capacitor C21, a capacitor C22, a capacitor C36, a capacitor C17, a capacitor C18, a capacitor C16, a resistor R4, a resistor R18, a resistor R22, a resistor R29, a resistor R32, a resistor R41, a resistor R44, a resistor R43, a capacitor C30, a resistor R20, a resistor R19, an inductor L1, a diode D7 and a diode D11, wherein the 1 and 2 of the driving transformer T2 are connected with external driving signals, the 3 pin is connected with the G pole of the power switch tube Q1 through the resistor R6, the 4 pin is connected with the S pole of the power switch tube Q1, the 5 pin is connected with the S pole of the power switch tube Q4 through the resistor R6, the power switch tube Q4 is connected with the Q31 through the resistor G pole of the resistor R4, the resistor R9 is connected with the resistor R6 in parallel, the resistor R26 is connected with the resistor R31 in parallel, the resistor R21 is connected between the G pole and the S pole of the power switch tube Q1 in parallel, the resistor R37 is connected between the G pole and the S pole of the power switch tube Q4 in parallel, the S pole of the power switch tube Q1 is connected with the D pole of the power switch tube Q4, the D pole of the power switch tube Q1 is connected with the 8 pin of the current transformer T1, the capacitor C15 is connected with the resistor R10 in series and then is connected between the D pole and the S pole of the power switch tube Q1 in parallel, the resistor R11 is connected with the resistor R10 in parallel, the capacitor C29 is connected with the resistor R39 in series and then is connected between the D pole and the S pole of the power switch tube Q4 in parallel, the S pole of the power switch tube Q1 is connected with the AC/DC full bridge rectifier circuit through the capacitor C21, the capacitor C22 and the capacitor C36 are connected with the capacitor C21 in parallel, the S electrode of the power switch tube Q4 is connected with a ground wire;

3. A single-phase inverter for use in a rail vehicle as claimed in claim 2, wherein: the AC/DC full-bridge rectification circuit comprises a main transformer T4, a main transformer T5, a diode D224, a diode D226, a diode D225, a diode D227, a diode D229, a resistor R216, a resistor R240, a resistor R241, a resistor R242, a resistor R243, a resistor R244, a resistor R245, a resistor R246, an inductor L202, a resistor R275, a resistor R274, a resistor R247, a capacitor C219, a capacitor C220, a capacitor C221, a capacitor C222, a capacitor C224, a resistor R277, a resistor R278, an LED lamp D230, a resistor R279, a capacitor CY204, a capacitor CY205, a capacitor CY206, a capacitor CY10, a capacitor C218 and a resistor R276, wherein the S pole of the power switch Q1 is connected with the 4 pin of the main transformer T5 through a capacitor C21, the S pole of the power switch Q2 is connected with the 1 pin of the main transformer T4 through an inductor L1, and the 1 pin of the main transformer T5 is connected with the main transformer T4;

-the DC power supply is ground;

the capacitor CY204, the capacitor CY205 and the capacitor CY206 are filter capacitors on the DC power supply;

Resistor R276 has one end connected to the anode of diode D227 and the other end connected to ground, and capacitor C218 is connected in parallel with resistor R276.

4. A single-phase inverter for use in a rail vehicle as claimed in claim 3, wherein: the power IPM inverter circuit is composed of an inverter DIPIPM and peripheral circuits thereof, a pin 40 of the inverter DIPIPM is connected with the +dc power supply, and pins 37, 38 and 39 of the inverter DIPIPM are inverter voltage output ends; inverter DIPIPM is used to invert the +dc power supply to AC220V power supply;

5. A single-phase inverter for use in a rail vehicle as defined in claim 4, wherein: the front-stage auxiliary power circuit consists of an LM201 type voltage stabilizer and a peripheral circuit thereof; the rear auxiliary power circuit is composed of a three-terminal voltage regulator U501 and peripheral circuits thereof.