CN114157161A

CN114157161A - Be applied to rail vehicle's single-phase dc-to-ac converter

Info

Publication number: CN114157161A
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: 2022-03-08
Anticipated expiration: 2041-12-07
Also published as: CN114157161B

Abstract

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

Description

Be applied to rail vehicle's single-phase dc-to-ac converter

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, the supply mode of the on-vehicle single-phase 220V power of track generally adopts and obtains from three-phase inverter rear end vary voltage through single-phase power frequency transformer, or gets the electricity from the high-voltage bus and obtain through DC/AC converter, but these two kinds of modes all need guarantee that the contact net voltage is normal and the vehicle is online to move just can, just can't provide single-phase 220V power when the vehicle need be taken off the production line to maintain and overhaul, and this just makes the equipment that many needs this mains operated can't use under this condition.

Disclosure of Invention

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

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

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

the pre-stage phase-shifting full-bridge DC/DC conversion circuit of the single-phase inverter comprises an input EMI filter circuit, a pre-charging circuit, a primary side overcurrent detection circuit, a phase-shifting full-bridge DC/AC inverter circuit, an AC/DC full-bridge rectification circuit and a pre-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 pre-charging circuit, the pre-charging circuit is connected with the primary side overcurrent detection circuit, the primary side overcurrent 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 pre-stage auxiliary power circuit supplies power for the input EMI filter circuit, the pre-charging circuit, the primary side overcurrent detection circuit, the phase-shifting full-bridge DC/AC inverter circuit and the AC/full-bridge rectification circuit;

the rear-stage power IPM inverter circuit of the single-phase inverter comprises a middle-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 and 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 rectification 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 middle-stage energy storage filter circuit is connected with the input end of the power IPM inverter circuit, the alternating current output voltage and 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 and current acquisition circuit.

Preferably, the input EMI filter circuit includes a voltage dependent resistor 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, where

pins

1 and 4 of the common mode inductor L3 are respectively connected to a positive voltage end and a negative voltage end of an external power supply, pin 2 is connected to a precharge circuit, and a pin 3 output voltage VPP;

the voltage dependent resistor 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;

a pin 2 of the common-mode inductor L3 is connected with a pin 3 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 further connected between the pin 2 and the pin 3 of the common-mode inductor L3, the pin 2 of the common-mode inductor L3 is connected to the ground through a common-mode capacitor CY4, and the pin 3 of the common-mode inductor L3 is connected to the ground through a common-mode capacitor CY 5.

Preferably, the pre-charging circuit comprises a fuse F1, a pre-charging thermistor R23, an input anti-reverse diode D5 and a relay K1, a pin 2 of the common mode inductor L3 is connected with a normally open end of the relay K1 through a fuse F1, a common end of the relay K1 is connected with the primary side overcurrent detection circuit, an anode of the diode D5 is connected with the normally open end of the relay K1 through a pre-charging thermistor R23, a cathode of the diode D5 is connected with a common 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 capacitor C40, a transistor Q6, a transistor Q7, a transistor Q8, a transistor Q3, a capacitor C31, a capacitor C27, 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 and an LED D45, the current transformer T45 is arranged at the common terminal of the relay K45 and is used for measuring a current signal output by the common terminal of the relay K45, a pin 3 of the current transformer T45 is connected with the common terminal of the phase shift relay K45, a pin 8 is connected with the positive pole of the full bridge DC/DC converter DS and the diode D365, the resistor R8 is connected in parallel between the pin 5 and the pin 6 of the current transformer T1, the anode of the diode D6 is connected with the pin 6 of the current transformer T1, the cathode of the diode D9 is connected with the cathode of the diode D9, the anode of the diode D9 is connected with the cathode of the diode D10, the anode of the diode D10 is connected with the base of the triode Q6 through the resistor R30 and the resistor R33, and the resistor R24, the resistor R25 and the resistor R26 are connected in parallel and then connected between the anode of the diode D10 and the ground wire;

the connection node of the resistor R30 and the resistor R33 is also connected with a ground wire through a resistor R40, one end of a capacitor C34 is connected with the base electrode of the triode Q6, the other end of the capacitor C34 is connected with the ground wire, the emitter electrode of the triode Q6 is connected with the ground wire, the collector electrode of the triode Q6 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 of the triode Q7 is connected with a current detection protection pin IB3 of an external power 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 the 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 D12 is connected with the collector electrode of the triode Q3 through a resistor R45;

the resistor R47 and the capacitor C35 are both connected in parallel between the base of the triode Q8 and the ground wire, the capacitor C32 and the resistor R34 are both connected in parallel between the emitter and the base of the triode Q7, the resistor R27 and the capacitor C31 are both connected in parallel between the emitter and the base of the triode Q3, and the emitter of the triode Q3 is also connected with an external 15V power supply.

Preferably, the phase-shifted full-bridge DC/AC inverter circuit includes a power switch Q1, a power switch Q2, a power switch Q3, a power switch Q4, 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 C39, a resistor R39, a capacitor C39, a resistor R39, a capacitor C39, a resistor R39, an inductor L39, a diode D39 and a diode D39, and the driving pole of the driving transformer T1 and the driving transformer T39 is connected with the power switch Q3, the power switch Q39, and the power switch Q39 is connected with the power switch Q39 through the external power switch pin S3 and the power switch pin S39, and the power switch pin of the power switch Q39, and the power switch pin of the power switch Q pole of the power switch Q39 are connected through the power switch Q39, and the power switch Q pole of the power switch Q39, and the power switch S39, and the power switch Q39, and the power switch, A pin 6 is connected with a pole G of a power switch tube Q4 through a resistor R31, a resistor R9 is connected in parallel with a resistor R6, a resistor R25 is connected in parallel with a resistor R31, a resistor R21 is connected in parallel between the pole G and the pole S of a power switch tube Q1, a resistor R37 is connected in parallel between the pole G and the pole S of the power switch tube Q4, the pole S of the power switch tube Q4 is connected with the pole D of the power switch tube Q4, the pole D of the power switch tube Q4 is connected with a pin 8 of a current transformer T4, a capacitor C4 is connected in series with the resistor R4 and then connected in parallel between the pole D and the pole S of the power switch tube Q4, the resistor R4 is connected in parallel with the resistor R4, the pole S of the power switch tube Q4 is connected in series with the capacitor C4 through the capacitor C6372, and the capacitor C4 are connected in parallel with a full bridge AC/DC ground wire of the power switch tube Q4, and the capacitor S4 are connected in parallel with the capacitor C4;

a pin 1 and a pin 2 of a driving transformer T3 are connected with an external driving signal, a pin 3 is connected with a pole G of a power switch tube Q2 through a resistor R4, a pin 4 is connected with a pole S of a power switch tube Q2, a pin 5 is connected with a pole S of a power switch tube Q5, a pin 6 is connected with a pole G of a power switch tube Q5 through a resistor R32, the resistor R18 is connected with the resistor R4 in parallel, the resistor R29 is connected with the resistor R32 in parallel, the resistor R22 is connected between the pole G and the pole S of the power switch tube Q2 in parallel, a resistor R41 is connected between the pole G and the pole S of the power switch tube Q5 in parallel, the pole S of the power switch tube Q2 is connected with a pole D of the power switch tube Q5, the pole D of the power switch tube Q2 is connected with a pin 8 of the current transformer T1, a capacitor C1 is connected with the resistor R1 in series and then connected between the pole D1 in parallel, and the resistor R1 are connected with the pole S1 in parallel, and the power switch tube Q1 in parallel, and the resistor R1 are connected in series, and the resistor R1 in parallel, the resistor R44 is connected 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 anode of the diode D7 and the cathode of the diode D11, the cathode of the diode D7 is connected with the 8 pin of the current transformer T1, the anode 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 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, 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 tube Q2 is connected with the 1 pin of the main transformer T4 through an inductor L1, the 1 pin of the main transformer T4 is connected with the 1 pin of the main transformer T5, and the 4 pins of the main transformer T4 are connected with the 4 pins of the main transformer T5;

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 of the rectifier bridge is connected with the ground wire through the capacitor CY10 and outputs a-DC power supply, the other end of the output end of the rectifier bridge outputs 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, the resistor R216, the resistor R240, the resistor R241, the resistor R242, the resistor R243, the resistor R244, the resistor R245 and the resistor R246 form a discharge resistor network, and the discharge resistor network is connected to the negative electrode of the diode D229;

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

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

-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 a peripheral circuit thereof, wherein pin 40 of the inverter DIPIPM is connected to the + DC power supply, and

pins

37, 38 and 39 of the inverter DIPIPM are inverter voltage output terminals; an inverter DIPIPM for inverting the + DC power supply to an 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 DIPIP of the inverter;

the PWM wave RC filter circuit comprises an RC filter consisting of a resistor R13 and a capacitor C24, an RC filter consisting of a resistor R15 and a capacitor C26, an RC filter consisting of a resistor R17 and a capacitor C28, an RC filter consisting of a resistor R12 and a capacitor C23, an RC filter consisting of a resistor R14 and a capacitor C25, an RC filter consisting of a resistor R16 and a capacitor C27, an RC filter consisting of a resistor R13 and a capacitor C24, an RC filter consisting of a resistor R15 and a capacitor C26, an RC filter consisting of a resistor R17 and a capacitor C28, which are respectively arranged on a pin 1, a pin 7 and a pin 13 of the inverter IPM, an RC filter consisting of a resistor R12 and a capacitor C23, an RC filter consisting of a resistor R14 and a capacitor C25, an RC filter consisting of a resistor R16 and a capacitor C27, which are respectively arranged on a pin 27, a pin 28 and a pin 29 of the inverter IPM;

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 a pin 39 of an inverter DIPLM is connected with a pin 7 of the inductor L501, a pin 8 of the inductor L501 outputs L voltage, a pin 38 of the inverter DIPLM outputs V3 voltage, the L voltage is connected with the ground through the capacitor CY502, the V3 voltage is connected with the ground 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 current 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 D505, a resistor R509, a capacitor C505, a rectifier bridge D502, a resistor R504, a capacitor C515, 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 an L voltage loop and used for acquiring a current signal 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 D B is connected with the 3 pin of the amplifier N501 through the resistor R503, the negative output end of the 501A is connected with the 2 pin of the amplifier N501A through the resistor R507, the negative output end of the amplifier N503 and the capacitor C501 are connected with the output end of the rectifier bridge C501 through the capacitor D501, one end of a resistor R505 is connected with a pin 3 of an amplifier N501A, the other end of the resistor R505 is connected with a negative output end of a rectifier bridge D501, the pin 3 of the amplifier N501A is connected with a ground wire through a capacitor C504, a resistor R508 is connected between a pin 2 and a pin 1 of the amplifier N501A, the pin 1 of the amplifier N501A is connected with an AD interface AD1 controlled externally through a resistor R509, the capacitor C515 and the capacitor C505 are filter capacitors of the pin 1 of the amplifier N501A, the positive pole of a diode D503 is connected with the pin 1 of the amplifier N501A, the negative pole of the diode D504 is connected with the pin 1 of the amplifier N501A, and the positive pole of the diode D504 is connected with the ground wire;

one end of the primary side of a 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 a rectifier bridge D502, the positive output end of the rectifier bridge D502 is connected with the 5 pin of an amplifier N501B through a resistor R504, the negative output end of the rectifier bridge D502 is connected with the 6 pin of an amplifier N501B through a resistor R520, a capacitor C516 and a capacitor C508 are filter capacitors of the positive output end of the rectifier bridge D502, one end of a resistor R506 is connected with the 5 pin of an 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 an amplifier N501B is connected with the ground wire through a capacitor C517, a resistor R521 is connected between the 6 pin and the 7 pin of an amplifier N501B, the 1 pin of an amplifier N501A is connected with another AD2 of an external control through a resistor R512, the capacitors C519 and C509 are filter capacitors of the 7 pin of an amplifier N501B, the positive pin of the diode D506 is connected with the 7 pin of the amplifier N501B, the negative power supply, the negative electrode of a diode D501B is connected with the amplifier N B, The positive electrode is connected with the ground wire.

Preferably, the preceding stage auxiliary power supply circuit is composed of an LM201 type voltage stabilizer and a peripheral circuit thereof; the post-stage auxiliary power supply circuit is composed of a three-terminal 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 a single-phase 220V power supply cannot be provided after the existing vehicle is offline, can realize electrical isolation, has the capacity of 2.5KVA, has the input voltage which is matched with the wide voltage range of a 110V storage battery on the railway vehicle and is DC 80V-140V, is particularly suitable for the railway vehicle with the storage battery of 110V grade, can start the storage battery of the vehicle to obtain single-phase 220V alternating current when the single-phase 220V power supply is needed for the offline maintenance and cleaning of the vehicle, and can work without the voltage of a contact network bus compared with a single-phase power frequency transformer and a converter which are applied on the market, thereby creating the power supply condition for the online maintenance of the vehicle. Compared with a power frequency transformer, the power frequency transformer has the advantages of smaller volume and lighter weight under the same power, voltage-stabilizing output capability and various protection functions, and improves the power utilization safety of vehicles.

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 overcurrent 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 present invention;

FIG. 7 is a circuit diagram of a preceding stage auxiliary power supply 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 a 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 a latter-stage auxiliary power supply circuit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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

pins

The voltage dependent resistor ZV1 is used for protecting a rear-stage device from being broken down and damaged 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 overcurrent for a long time. When the input terminal is powered on, in order to prevent damage to the rear-stage bus capacitors (C19 and C20 in fig. 5) due to instantaneous charging, the intermediate-stage capacitors are charged first through the current limiting effect of R23, and after the intermediate-stage capacitors are charged to an appropriate value, the K1 is closed to short-circuit the R23, so that pre-charging is completed. The input anti-reverse diode D5 serves to prevent the input port from being reverse in polarity to cause power supply damage.

the connection node of the resistor R30 and the resistor R33 is also connected with a ground wire through a resistor R40, one end of a capacitor C34 is connected with the base electrode of the triode Q6, the other end of the capacitor C34 is connected with the ground wire, the emitter electrode of the triode Q6 is connected with the ground wire, the collector electrode of the triode Q6 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 of the triode Q7 is connected with a current detection protection pin IB3 of an external power control chip; in this embodiment, the collector of the transistor Q7 provides a current detection protection signal for the external power control chip.

The primary side overcurrent detection circuit is used for detecting primary side short-time overcurrent to prevent the power switch tube Q1, the power switch tube Q2, the power switch tube Q4 and the power switch tube Q5 from being damaged. The primary side current is collected through the current transformer T1, if the detected current is higher than the current protection threshold value instantly, the triode Q6 is conducted, the potential of the point CON0 is pulled down to 0, the triode Q7 is further conducted, the point position of the current detection protection pin I B3 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 is pulled down, the triodes Q3 and Q8 are also turned on successively, after the Q8 is turned on, the voltage at the CON0 is pulled down again, and since the capacitor C35 needs a certain time to discharge, the CON0 will remain at the low level during this time, the Q3 is still turned on, and then the capacitor C35 is charged continuously, and the capacitor Q8 will remain on, so that a self-locking circuit is formed cyclically, the overcurrent indicator lamp D12 is also continuously turned on, and the power supply enters a fault locking state.

The phase-shifted full-bridge DC/AC inverter circuit has the advantages that the input voltage of DC 80-140V is inverted into high-frequency alternating current to prepare for the voltage reduction of a subsequent transformer, the working frequency of the circuit is designed to be 65K, the size 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 switch tubes Q1, Q2, Q4 and Q5 adopt MOSFETs with 250V/128A/9m omega grade parameters. And C17 and C18 are bus absorption capacitors for absorbing bus voltage spikes. C15, C16, C29, C30, R10, R11, R19, R20, R38, R39, R43, R44 constitute an RC snubber circuit that sinks DS voltage spikes for each MOSFET. L1 is resonance inductance, which makes L1 form resonance with junction capacitance of MOSFET by phase shift control, thereby realizing soft switch to improve power efficiency. C21, C22 and C36 are blocking capacitors, so that magnetic saturation caused by magnetic biasing of the transformer in working 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-shifted full-bridge DC/AC inverter circuit to obtain the intermediate-stage voltage required by the rear-stage power IPM inverter circuit. T4 and T5 are main transformers, AC 80-140 Vrms are boosted, and then rectified into DC 330-340V through a full bridge rectifying circuit formed by the following D224-D227. An LC filter circuit is formed by the output filter inductor L202 and the capacitors C219-224 and is used for inhibiting high-frequency interference, and R216 and R240-R246 are intermediate-stage discharge resistors. D230 is a middle-stage voltage indicator lamp, CY10 and C204-C206 are negative in-line and ground capacitors and are used for eliminating part of common-mode interference.

Preferably, the power IPM inverter circuit is composed of an inverter DIPIPM and a peripheral circuit thereof, wherein pin 40 of the inverter DIPIPM is connected to the + DC power supply, and pins 37, 38 and 39 of the inverter DIPIPM are inverter voltage output terminals; an inverter DIPIPM for inverting the + DC power supply to an 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 conversion of the preceding stage into AC 220V. 40 pins are input pins of middle-stage voltage, 37-39 are inverting output voltage pins, 1, 7 and 13 are input pins of 3 upper bridge arm PWM signals, 27, 28 and 29 are input pins of 3 lower bridge arm PWM signals, 19 pins are internal bridge arm current detection pins, when a bridge arm is in short circuit or overcurrent fault, detected overcurrent signals are converted into voltage signals through an external part pull-down resistor RSE and a current limiting resistor R5 to enter 24 pins for fault judgment, 25 pins are fault output pins, when the bridge arm is in short circuit or the lower bridge arm is in insufficient voltage, high-level signals are sent out, and the duration time of signal pulses is set through a pull-down capacitor of 25 pins. R1-R3, D1-D3, C1-C3, C6-C8 and Z1-Z3 form a bootstrap circuit, after the lower arm is turned on in each switching period, a 15V power supply can charge bootstrap capacitors C1, C3 and C7, so that an independent power supply is provided for the PWM driving signal of the upper arm at the moment when the upper arm is turned off and needs to be turned on, and the driving power supplies of the 3-path lower arm adopt the same 15V power supply and the same reference ground.

the PWM wave RC filter circuit eliminates voltage glitch of a driving waveform through RC filtering.

the alternating current output LC filter circuit forms an LC filter network by an output filter inductor L501 and output filter capacitors C524-C527 to filter the AC220V, the power quality is improved, and the lower ground capacitors CY502 and CY503 are used for suppressing common mode interference on the output side.

The output current is collected through the current transformer T501, and after the output current is converted into a voltage signal through the current transformer T501, the voltage signal is output to an AD collection pin AD1 of the single-chip microcomputer through the rectifier bridge D501 and the post-stage operational amplifier circuit N501A, and the output overcurrent protection circuit is used for output overcurrent protection of the single-phase inverter. The sampling transformer T502 collects the output voltage, and the output voltage is rectified by the rectifier bridge D502 and operated by the operational amplifier N501B and then output to the AD collection pin AD2 of the single chip microcomputer for realizing the closed-loop operation of the output voltage of the inverter.

An auxiliary power supply circuit of a preceding-stage phase-shifted full-bridge system mainly adopts a 15W power supply module to build a peripheral circuit and provide power for a preceding-stage control system.

And the secondary auxiliary power supply circuit adopts a three-terminal voltage stabilizing source module to build a peripheral circuit and provides power for a control system of a secondary power supply. In the embodiment, the three-terminal voltage-stabilizing source module is L7805 ABV-DG.

Claims

1. A single-phase inverter applied to a rail vehicle is characterized in that: the system comprises a front-stage phase-shifted full-bridge DC/DC conversion circuit of the single-phase inverter and a rear-stage power IPM inverter circuit of the single-phase inverter, wherein the front-stage phase-shifted full-bridge DC/DC conversion circuit of the single-phase inverter is electrically connected with the rear-stage power IPM inverter circuit of the single-phase inverter;

2. The single-phase inverter applied to a railway vehicle as claimed in claim 1, wherein: the input EMI filter circuit comprises a voltage dependent resistor 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 pins 1 and 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 pre-charging circuit, and a pin 3 output voltage VPP;

3. A single-phase inverter for a rail vehicle according to claim 2, wherein: the pre-charging circuit comprises a fuse F1, a pre-charging thermistor R23, an input anti-reverse diode D5 and a relay K1, wherein a pin 2 of the common-mode inductor L3 is connected with the normally-opened end of the relay K1 through a fuse F1, the common end of the relay K1 is connected with a primary side over-current detection circuit, the anode of the diode D5 is connected with the normally-opened end of the relay K1 through a pre-charging thermistor R23, the cathode of the diode D5 is connected with the common end of the relay K1, and a coil of the relay K1 is controlled by an external 15V power supply.

4. A single-phase inverter for a rail vehicle according to claim 3, wherein: 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 capacitor C40, a triode Q6, a triode Q7, a triode Q8, a triode Q3, a capacitor C31, a capacitor C27, 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 and an LED lamp D45, wherein the current transformer T45 is arranged at the common end of the relay K45 and used for measuring a current signal output by the common end of the relay K45, a pin 3 of the current transformer T45 is connected with the common end of the relay K45, a pin 8 is connected with the phase-shift circuit, a full-bridge DC/AC (direct current) pin) of the DC/DC pole DS and the full-bridge diode DS 365 are connected with the current transformer T366, the resistor R8 is connected in parallel between the pin 5 and the pin 6 of the current transformer T1, the anode of the diode D6 is connected with the pin 6 of the current transformer T1, the cathode of the diode D9 is connected with the cathode of the diode D9, the anode of the diode D9 is connected with the cathode of the diode D10, the anode of the diode D10 is connected with the base of the triode Q6 through the resistor R30 and the resistor R33, the resistor R24, the resistor R25 and the resistor R26 are connected in parallel and then connected between the anode of the diode D10 and the ground wire, and the base of the triode Q6 is also connected with the ground wire through the capacitor C54;

5. The single-phase inverter applied to a railway vehicle as claimed in claim 4, wherein: the phase-shifted full-bridge DC/AC inverter circuit comprises a power switch tube Q1, a power switch tube Q2, a power switch tube Q3, a power switch tube Q4, 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 C39, a resistor R39, a capacitor C39, a resistor R39, a capacitor C39, a resistor R39, an inductor L39, a diode D39 and a diode D39, wherein a pin 1 of the driving transformer T39 is connected with a pin of the power switch tube Q3, a pin of the power switch tube Q5972, a power switch tube Q39, a power switch tube Q595, a power switch tube Q4, a power switch tube Q39, a capacitor C39, a resistor R39, a power pole and a power switch pole of a power pole and a power switch pole, a power pole of a power switch pole of a power switch pole of a power switch pole of a power switch tube of a power switch pole of a power switch pole of a power, A pin 6 is connected with a pole G of a power switch tube Q4 through a resistor R31, a resistor R9 is connected in parallel with a resistor R6, a resistor R25 is connected in parallel with a resistor R31, a resistor R21 is connected in parallel between the pole G and the pole S of a power switch tube Q1, a resistor R37 is connected in parallel between the pole G and the pole S of the power switch tube Q4, the pole S of the power switch tube Q4 is connected with the pole D of the power switch tube Q4, the pole D of the power switch tube Q4 is connected with a pin 8 of a current transformer T4, a capacitor C4 is connected in series with the resistor R4 and then connected in parallel between the pole D and the pole S of the power switch tube Q4, the resistor R4 is connected in parallel with the resistor R4, the pole S of the power switch tube Q4 is connected in series with the capacitor C4 through the capacitor C6372, and the capacitor C4 are connected in parallel with a full bridge AC/DC ground wire of the power switch tube Q4, and the capacitor S4 are connected in parallel with the capacitor C4;

6. The single-phase inverter applied to a railway vehicle as claimed in claim 5, 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 a power switch tube Q1 is connected with the 4 feet of the main transformer T8295 through an inductor L1, the S pole of the power switch tube Q2 is connected with the main transformer foot 1 of the T4, the main transformer T4 is connected with the T21 foot of the main transformer T4, and the T3874 foot of the T5 is connected with the T364;

-the DC power supply is ground;

7. The single-phase inverter applied to a railway vehicle as claimed in claim 6, wherein: the power IPM inverter circuit consists of an inverter DIPIP and a peripheral circuit thereof, wherein a pin 40 of the inverter DIPIP is connected with the + DC power supply, and pins 37, 38 and 39 of the inverter DIPIP are inverter voltage output ends; an inverter DIPIPM for inverting the + DC power supply to an AC220V power supply;

8. The single-phase inverter applied to a railway vehicle as claimed in claim 7, wherein: the front-stage auxiliary power supply circuit consists of an LM201 type voltage stabilizer and a peripheral circuit thereof; the post-stage auxiliary power supply circuit is composed of a three-terminal regulator U501 and peripheral circuits thereof.