CN211670790U - Rail train emergency ventilation inverter power supply - Google Patents
Rail train emergency ventilation inverter power supply Download PDFInfo
- Publication number
- CN211670790U CN211670790U CN202020716086.9U CN202020716086U CN211670790U CN 211670790 U CN211670790 U CN 211670790U CN 202020716086 U CN202020716086 U CN 202020716086U CN 211670790 U CN211670790 U CN 211670790U
- Authority
- CN
- China
- Prior art keywords
- circuit
- ended
- power supply
- rail train
- boost
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a rail train emergency ventilation inverter power supply, which belongs to the technical field of rail train air conditioners and comprises a protection circuit, an EMI circuit, a booster circuit, an inverter circuit and an output filter circuit from input to output in sequence according to the flow direction of a signal, and also comprises an auxiliary source circuit, a control circuit and a sampling circuit; the boost circuit comprises a first single-ended boost circuit and a second single-ended boost circuit which are connected in parallel; trigger signals received by a first switch tube in the first single-ended booster circuit and a second switch tube in the second single-ended booster circuit are pulse width modulation signals with the same frequency and 180-degree phase difference respectively; therefore, the power capacity and the reliability of the converter can be improved, and the current stress of the switching tube can be reduced. The method also has the advantages of reducing switching loss, outputting voltage, outputting current ripple and the like, and greatly improves the performance of the railway vehicle.
Description
Technical Field
The utility model belongs to the technical field of the rail train air conditioner, especially, relate to an emergent ventilation dc-to-ac converter power of rail train.
Background
The emergency ventilation inverter power supply is an important component of an emergency power supply system of the air conditioning system as a key part of the subway air conditioning system, and when the vehicle air conditioning system does not supply power, the emergency power supply is started to supply power, so that the air conditioner is ensured to provide fresh air for 45 minutes for the rail vehicle. A Boost circuit in an emergency power supply of a vehicle is one of basic circuit topological structures, and is widely applied to multiple fields of photovoltaic power generation systems, electric automobiles and the like due to the characteristics of simple topological structure, high efficiency, easiness in control and the like. With the rapid development of power electronics technology, the requirements for converter power levels and circuit devices are gradually increasing.
The emergency ventilation inverter is hung on a DC bus 110V of a railway vehicle as vehicle-mounted equipment, adopts a storage battery for power supply, BOOSTs the voltage through a middle chopping BOOST circuit, charges the capacitor of the middle circuit, and inverts through an IPM circuit. In the prior art, a main inverter topology circuit adopts single-ended BOOST, and the single-ended BOOST circuit consists of a switching transistor VT, a diode VD, an energy storage inductor L and an output filter capacitor C. The output voltage of the converter is higher than the input voltage due to the inductive voltage on the inductor which is usually higher than the input voltage, and the isolation effect of the diode, so the converter is called a boost converter. When the drive control signal turns on the switching transistor, energy flows from the input power supply and is stored in the inductor L, the diode VD is reversely biased, and the load R is supplied with energy by the filter capacitor C. When VT is cut off, the inductance channel current can not change suddenly, the induced potential generated by the inductance channel current prevents the current from reducing, and the polarity of the potential is negative left and positive right. The diode VD is turned on and the energy stored in the inductor flows through the diode VD into the capacitor C and is supplied to the load R. However, with the rapid development of power electronic technology, the requirements for the power grade and circuit devices of the converter are gradually increased, the use of a single converter cannot meet the requirements, and on one hand, the volume of the energy storage inductor and the energy storage capacitor is large. On the other hand, the input current is large, the stress on the switching device VT is large, and high ripples exist in the output voltage and the output current.
Therefore, there is a need in the art for a new solution to solve this problem.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art: the utility model provides an emergent ventilation inverter power of rail train for solve energy storage inductance and energy storage electric capacity's bulky, thereby the problem that the automobile body is heavy, on the other hand solves input current big, and the stress that switching device VT bore is big, and lead to having the problem of higher ripple among output voltage and the output current.
In order to realize the purpose, the utility model discloses a technical scheme is: a rail train emergency ventilation inverter power supply comprises a protection circuit, an electromagnetic interference circuit, a booster circuit, an inverter circuit, an output filter circuit, an auxiliary source circuit, a control circuit and a sampling circuit in sequence from input to output according to the flow direction of signals; the boost circuit comprises a first single-ended boost circuit and a second single-ended boost circuit; the first single-ended boost circuit comprises a first boost inductor, a first switch tube, a first diode, a capacitor and a load; the second single-ended boost circuit comprises a second boost inductor, a second switching tube, a second diode, a capacitor and a load; the first single-ended booster circuit and the second single-ended booster circuit are connected in parallel; the trigger signals received by the first switch tube and the second switch tube are pulse width modulation signals with the same frequency and 180-degree phase difference respectively; the control circuit comprises a 12-bit 16-channel analog-to-digital conversion chip and an 8-channel pulse width modulation circuit; two of the 8 paths of pulse width modulation circuits drive the booster circuit, and the other six paths drive the inverter circuit.
The actual selection type of the protection circuit is that two quick-break ceramic fuses with rated currents of 25 amperes are connected in parallel.
The electromagnetic interference circuit is used for filtering common mode interference and differential mode interference.
The inverter switching device of the inverter circuit is selected to have the rated voltage of 1200v and the rated current of 50A, and the designed switching frequency is 10 kHz.
The filter of the output filter circuit is a circuit network without a power supply and composed of an inductor and a capacitor.
The auxiliary source circuit is in multi-path output, the input voltage is DC 77-137.5V, and the maximum duty ratio is 0.65.
Through the above design scheme, the utility model discloses following beneficial effect can be brought:
1. the volume of the energy storage inductor and the volume of the energy storage capacitor are reduced, and the aim of light weight is fulfilled.
2. The current stress of the switching tube is reduced, the switching loss, the output voltage and the output current ripple are reduced, the fluctuation on a vehicle direct current bus is reduced while the emergency ventilation inverter is protected, and the performance of the railway vehicle is greatly improved.
Drawings
Fig. 1 is the utility model relates to a rail train emergency ventilation inverter power's working principle diagram.
Fig. 2 is a diagram of a conventional single-ended boost circuit in the prior art.
Fig. 3 is the utility model relates to a schematic diagram is connected to main control board of rail train emergency ventilation dc-to-ac converter power.
Fig. 4 is the utility model relates to a boost circuit diagram of rail train emergency ventilation inverter power.
In the figure, 1-protection circuit, 2-electromagnetic interference circuit, 3-booster circuit, 31-first single-ended booster circuit, 32-second single-ended booster circuit, 311-first booster inductor, 312-first switch tube, 313-first diode, 314-capacitor, 315-load, 321-second booster inductor, 322-second switch tube, 323-second diode, 4-inverter circuit, 5-output filter circuit, 6-auxiliary source circuit, 7-control circuit and 8-sampling circuit.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings
Shown in attached figures 1-4: a rail train emergency ventilation inverter power supply comprises a protection circuit 1, an electromagnetic interference circuit 2, a booster circuit 3, an inverter circuit 4 and an output filter circuit 5 in sequence from input to output according to the flow direction of signals; the device also comprises an auxiliary source circuit 6, a control circuit 7 and a sampling circuit 8; the method is characterized in that: the boosting circuit 3 comprises a first single-ended boosting circuit 31 and a second single-ended boosting circuit 32; the first single-ended boost circuit 31 comprises a first boost inductor 311, a first switch tube 312, a first diode 313, a capacitor 314 and a load 315; the second single-ended boost circuit 32 includes a second boost inductor 321, a second switching tube 322, a second diode 323, a capacitor 314, and a load 315; the first single-ended boost circuit 31 and the second single-ended boost circuit 32 are connected in parallel; the trigger signals received by the first switch tube 312 and the second switch tube 322 are pulse width modulation signals with the same frequency and 180-degree phase difference; the control circuit 7 comprises a 12-bit 16-channel analog-to-digital conversion chip and comprises 8 paths of pulse width modulation circuits; two of the 8 pulse width modulation circuits drive the booster circuit 3, and the other six drive the inverter circuit 4.
The main control chip adopts DSP28335, and the circuit structure guarantees to have very high reliability. In actual operation, the circuit operates in an inductor current Continuous Mode (Continuous current connection Mode), the first switch tube 312 and the second switch tube 322 operate, their duty ratios are equal and phase difference is 180 degrees, the first boost inductor 311 and the second boost inductor 321 are equal, and the first diode 313 and the second diode 323 are both free-wheeling diodes. The working process is divided into 4 stages:
in phase 1, the first switch tube 312 and the second switch tube 322 are turned on, and the first boost inductor 311 and the second boost inductor 321 store energy at this time.
In stage 2, the first switching tube 312 is turned off, the second switching tube 322 is turned on, the first boost inductor 311 forms a freewheeling circuit through the first diode 313 to release energy, and the second boost inductor 321 continues to store energy.
And in stage 3, the first switching tube 312 is turned on, the second switching tube 322 is turned off, the second boost inductor 321 forms a freewheeling circuit through the second diode 323 to release energy, and the first boost inductor 311 continues to store energy.
In stage 4, the first switch tube 312 is turned off, and the second switch tube 322 is turned off continuously, at this time, the first boost inductor 311 and the second boost inductor 321 form a freewheeling loop through the first diode 313 and the second diode 323 and release energy.
So that the two paths are crossed and conducted. Output voltage can be adjusted within a certain range by adjusting the duty ratio of the driving signal, if a power switch device with the same capacity is adopted, the output power of the power switch device is 2 times that of a single-ended booster circuit, and compared with the single-ended booster circuit, a circuit for performing double-BOOST staggered conduction boosting through comparison has the advantages that ripple current is small, the gain of the output voltage is high, and the gain is 2 times that of a single end.
Therefore, the power capacity and the reliability of the converter can be improved, and the current stress of the switching tube can be reduced. The application of the staggered parallel technology not only enables the whole system to have the advantage of parallel operation, but also has the advantages of reducing switching loss, output voltage, output current ripple and the like, greatly improves the performance of the rail vehicle, and improves the reliability of the rail vehicle.
The actual model of the protection circuit 1 is that two quick-break ceramic fuses with rated currents of 25 amperes are connected in parallel.
The electromagnetic interference circuit 2 is a circuit for filtering out common mode interference and differential mode interference. L, CY1, CY2 are used to filter out common mode interference, CX1, CX2 to filter out differential mode interference. The Y capacitor is a ceramic capacitor.
The switching device of the inverter circuit 4 has a rated voltage of 1200v, a rated current of 50A and a designed switching frequency of 10 kHz. The switching device of the inverter is selected to be FS50R12W1T 4.
The filter of the output filter circuit 5 is a circuit network without a power supply and composed of an inductor and a capacitor. The working principle is that the series LC circuit does not generate voltage drop to fundamental wave and high impedance to higher harmonic wave under ideal state, and the higher harmonic wave current is restrained.
The auxiliary source circuit 6 is in multi-path output, the input voltage is DC 77-137.5V, and the maximum duty ratio is 0.65. The EER3542 magnetic core is selected by design. Duty cycle refers to the proportion of the time that power is applied to the total time in a pulse cycle. The Duty cycle (Duty Ratio) has the following meaning in the field of telecommunications: for example: the pulse width is 1 mus and the duty cycle of the pulse sequence is 0.25 for a signal period of 4 mus. Efficiency of the auxiliary source is 85%: the auxiliary source is a power supply switching power supply, and the definition of efficiency is output power/input power.
The main control chip adopts TMS320F28335, an external 20M crystal oscillator and a total of 12-bit 16-channel ADC, wherein 15 paths of ADC are used, 4 paths of ADC are used for boost current sampling, 2 paths of ADC are used for BUS voltage sampling, 1 path of input voltage sampling, 2 paths of AC current sampling, 3 paths of AC voltage sampling, 2 paths of temperature sampling and 1 path of ADC is used for reference voltage sampling. 8 paths of pulse width modulation circuits are used, wherein two paths drive the booster circuit 3, and the other six paths drive the inverter circuit 4.
It is obvious that the above-described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Claims (6)
1. A rail train emergency ventilation inverter power supply comprises a protection circuit (1), an electromagnetic interference circuit (2), a booster circuit (3), an inverter circuit (4) and an output filter circuit (5) in sequence from input to output according to the flow direction of signals; the device also comprises an auxiliary source circuit (6), a control circuit (7) and a sampling circuit (8); the method is characterized in that: the booster circuit (3) comprises a first single-ended booster circuit (31) and a second single-ended booster circuit (32); the first single-ended boost circuit (31) comprises a first boost inductor (311), a first switch tube (312), a first diode (313), a capacitor (314) and a load (315); the second single-ended boost circuit (32) comprises a second boost inductor (321), a second switching tube (322), a second diode (323), a capacitor (314) and a load (315); the first single-ended booster circuit (31) and the second single-ended booster circuit (32) are connected in parallel; the trigger signals received by the first switch tube (312) and the second switch tube (322) are pulse width modulation signals with the same frequency and 180-degree phase difference respectively; the control circuit (7) comprises a 12-bit 16-channel analog-to-digital conversion chip and comprises 8 paths of pulse width modulation circuits; two of the 8 paths of pulse width modulation circuits drive the booster circuit (3), and the other six paths drive the inverter circuit (4).
2. The rail train emergency ventilation inverter power supply of claim 1, wherein: the protection circuit (1) is formed by connecting two quick-break ceramic fuses with 25 amperes rated current in parallel.
3. The rail train emergency ventilation inverter power supply of claim 1, wherein: the electromagnetic interference circuit (2) is a circuit for filtering common mode interference and differential mode interference.
4. The rail train emergency ventilation inverter power supply of claim 1, wherein: the inverter switching device of the inverter circuit (4) is selected to have the rated voltage of 1200V, the rated current of 50A and the designed switching frequency of 10 kHz.
5. The rail train emergency ventilation inverter power supply of claim 1, wherein: and a filter of the output filter circuit (5) is a circuit network without a power supply and consisting of an inductor and a capacitor.
6. The rail train emergency ventilation inverter power supply of claim 1, wherein: the auxiliary source circuit (6) is in multi-path output, the input voltage is DC 77-137.5V, and the maximum duty ratio is 0.65.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020716086.9U CN211670790U (en) | 2020-05-06 | 2020-05-06 | Rail train emergency ventilation inverter power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020716086.9U CN211670790U (en) | 2020-05-06 | 2020-05-06 | Rail train emergency ventilation inverter power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211670790U true CN211670790U (en) | 2020-10-13 |
Family
ID=72743661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020716086.9U Active CN211670790U (en) | 2020-05-06 | 2020-05-06 | Rail train emergency ventilation inverter power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211670790U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116760166A (en) * | 2023-06-05 | 2023-09-15 | 广东振辉消防科技有限公司 | Special emergency power supply for integrated buck-boost lamp |
-
2020
- 2020-05-06 CN CN202020716086.9U patent/CN211670790U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116760166A (en) * | 2023-06-05 | 2023-09-15 | 广东振辉消防科技有限公司 | Special emergency power supply for integrated buck-boost lamp |
| CN116760166B (en) * | 2023-06-05 | 2024-01-19 | 广东振辉消防科技有限公司 | Special emergency power supply for integrated buck-boost lamp |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Kwon et al. | High gain soft-switching bidirectional DC–DC converter for eco-friendly vehicles | |
| CN105958823B (en) | A kind of quasi- Z source converter circuit of electric current continuous type high-gain boost switching | |
| Qiao et al. | Analysis of buck-boost converters for fuel cell electric vehicles | |
| Lavanya et al. | Multi-input DC-DC converter topologies-a review | |
| Zhang et al. | Analysis and research of a soft-switching bidirectional DC–DC converter without auxiliary switches | |
| EP3255771B1 (en) | Bidirectional dc-dc convertor | |
| CN205847093U (en) | A kind of electric current continuous high-gain boost switching quasi-Z source converter circuit | |
| Ravi et al. | An overview of various DC-DC converter techniques used for fuel cell based applications | |
| CN111490695B (en) | Single-stage low-voltage stress switch capacitance type multi-level inverter topology structure and level modulation method | |
| Liu et al. | An improved zero-voltage and zero-current-switching phase-shift full-bridge pwm converter with low output current ripple | |
| CN111987924A (en) | Single-stage single-phase high-gain combined boost inverter circuit and boost inversion method | |
| CN110445227B (en) | Method for inhibiting high-frequency and low-frequency ripple current in vehicle-mounted single-phase charging system of electric automobile | |
| Kim et al. | Design and Control of OBC-LDC Integrated Circuit with Variable Turns Ratio for Electric Vehicles | |
| CN211670790U (en) | Rail train emergency ventilation inverter power supply | |
| CN102832838A (en) | Isolated single-level double-Sepic inverter based on magnetic integration | |
| CN102355038B (en) | High voltage direct current charger | |
| CN110198124B (en) | Switched capacitor type three-phase interleaved parallel bidirectional wide-gain direct current converter | |
| CN205847090U (en) | A kind of mixed type quasi-boost switching DC DC changer | |
| CN203608084U (en) | Four-switch boost-buck converter with low ripple | |
| CN105763065A (en) | Vehicle-mounted inversion device for different input voltages | |
| CN216649240U (en) | Topological structure for integrating renewable energy and energy storage technology into power grid | |
| KR102371910B1 (en) | Dc-dc converter | |
| Zhang et al. | Performance evaluation of a non-isolated bidirectional three-port power converter for energy storage applications | |
| Jayalakshmi et al. | Control of Single Phase Z-Source Inverter Fed Induction Motor Using Simple Boost Controller | |
| Pakkiraiah et al. | Isolated Bi-directional DC-DC converter's performance and analysis with Z-source by using PWM control strategy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |