CN203590046U - AC stabilized power supply for mining - Google Patents
AC stabilized power supply for mining Download PDFInfo
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- CN203590046U CN203590046U CN201320823829.2U CN201320823829U CN203590046U CN 203590046 U CN203590046 U CN 203590046U CN 201320823829 U CN201320823829 U CN 201320823829U CN 203590046 U CN203590046 U CN 203590046U
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Abstract
An AC stabilized power supply for mining relates to an AC stabilized power supply unit. The utility model aims to solve problems of large volume and high cost of a present power supply for mining. The AC stabilized power supply for mining comprises a power frequency step-down transformer, a power frequency rectifying circuit, a first inverter circuit, a high-frequency step-up transformer, a high-frequency rectifying circuit, a second inverter circuit, an output filter circuit and a control unit. Input of the power frequency step-down transformer is communicated with output of an underground coal mine power supply. Output of the power frequency step-down transformer is communicated with input of the power frequency rectifying circuit. Output of the power frequency rectifying circuit is communicated with input of the first inverter circuit. Output of the first inverter circuit is communicated with input of the high-frequency step-up transformer, output of which is communicated with input of the high-frequency rectifying circuit. Output of the high-frequency rectifying circuit is communicated with input of the second inverter circuit, output of which is communicated with input of the output filter circuit. Output of the output filter circuit is output of the stabilized power supply. The AC stabilized power supply is suitable for AC voltage stabilization.
Description
Technical field
The utility model relates to AC voltage stabilizer.
Background technology
In the power-supply system under coal mine, general employing exchanges 660V supply power voltage, on same power transmission line, can be connected to multiple power consumption equipment, and the power of some equipment reaches hundreds of kilowatt.When the larger power consumption equipment start and stop of these power, can cause supply voltage to fluctuate in a big way, exchange reach sometimes ± 30%(462-858V of power-supply fluctuation under 660V electric power thus supplied).Power supply can make some equipment cisco unity malfunctions when large like this range.
At present, conventional Underground Mine power supply adopts power frequency, multitap supply power mode conventionally, output voltage segmentation, have level, volume is large, price is high, simultaneously the response speed of output voltage is slow, result of use is undesirable.
Utility model content
The purpose of this utility model is in order to solve the problem that existing mining power volume is large, price is high, and a kind of mining alternating current steady voltage plug is provided.
Mining alternating current steady voltage plug, it comprises power frequency step-down transformer, industrial frequency rectifying circuit, the first inverter circuit, high-frequency step-up transformer, high-frequency rectification circuit, the second inverter circuit, output filter circuit and control unit, the input correspondence of power frequency step-down transformer is communicated with the output of colliery down-hole power, the output of power frequency step-down transformer is communicated with the input of industrial frequency rectifying circuit, the output of industrial frequency rectifying circuit is communicated with the input of the first inverter circuit, the output of the first inverter circuit is communicated with the input of high-frequency step-up transformer, the output of high-frequency step-up transformer is communicated with the input of high-frequency rectification circuit, the output of high-frequency rectification circuit is communicated with the input of the second inverter circuit, the output of the second inverter circuit is communicated with the input of output filter circuit, the output of output filter circuit is the output of described stabilized voltage power supply, the output of the first power amplifier of control unit is communicated with the input of the power amplifier of the first inverter circuit, the output of the second power amplifier of control unit is communicated with the input of the power amplifier of the second inverter circuit, the input of the first voltage detecting circuit of control unit is communicated with the output of the voltage detection signal of the first inverter circuit, the input of the first current detection circuit of control unit is communicated with the output of the current detection signal of the first inverter circuit, the input of the second voltage testing circuit of control unit is communicated with the output of the voltage detection signal of the second inverter circuit, the input of the second current detection circuit of control unit is communicated with the output of the current detection signal of the second inverter circuit.
The utility model is inputted through the step-down of power frequency step-down transformer, by industrial frequency rectifying, voltage stabilizing, after processing, is obtained direct voltage unsettled AC power in existing mine; It is zero PWM ripple that the direct voltage being obtained by industrial frequency rectifying is exported first-harmonic after inversion unit is processed, and PWM output voltage obtains stable 1000V direct voltage after high-frequency step-up transformer, high-frequency rectification and filtering; By the second inverter circuit, adopt SPWM technology and suitable modulation ratio M, the SPWM ripple of exporting by power tube filters high-frequency carrier signal through filter, finally obtains 50Hz, 660 ± 1% output AC voltage.
The utlity model has that wide input voltage range, output voltage precision are high, the fireballing feature of dynamic adjustments, reduced the volume of supply unit simultaneously, reduced cost, improved reliability.
Accompanying drawing explanation
Fig. 1 is system configuration schematic diagram of the present utility model, Fig. 2 is the main output waveform figure of embodiment four, Fig. 3 is the voltage stabilizing control principle drawing of embodiment nine, Fig. 4 is the output voltage detecting circuit figure of embodiment nine, Fig. 5 is the overload protecting circuit figure of embodiment nine, Fig. 6 is the power driving circuit figure of embodiment nine, Fig. 7 is the main program flow chart of embodiment nine, Fig. 8 is that the output voltage PI of embodiment nine regulates flow chart, Fig. 9 is the inversion output waveform figure of embodiment nine, Figure 10 is the AC sine output waveform figure of embodiment nine.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1, mining alternating current steady voltage plug described in present embodiment, it comprises power frequency step-down transformer 1, industrial frequency rectifying circuit 2, the first inverter circuit 3, high-frequency step-up transformer 4, high-frequency rectification circuit 5, the second inverter circuit 6, output filter circuit 7 and control unit 8, the input correspondence of power frequency step-down transformer 1 is communicated with the output of colliery down-hole power, the output of power frequency step-down transformer 1 is communicated with the input of industrial frequency rectifying circuit 2, the output of industrial frequency rectifying circuit 2 is communicated with the input of the first inverter circuit 3, the output of the first inverter circuit 3 is communicated with the input of high-frequency step-up transformer 4, the output of high-frequency step-up transformer 4 is communicated with the input of high-frequency rectification circuit 5, the output of high-frequency rectification circuit 5 is communicated with the input of the second inverter circuit 6, the output of the second inverter circuit 6 is communicated with the input of output filter circuit 7, the output of output filter circuit 7 is the output of described stabilized voltage power supply, the output of the first power amplifier of control unit 8 is communicated with the input of the power amplifier of the first inverter circuit 3, the output of the second power amplifier of control unit 8 is communicated with the input of the power amplifier of the second inverter circuit 6, the input of the first voltage detecting circuit of control unit 8 is communicated with the output of the voltage detection signal of the first inverter circuit 3, the input of the first current detection circuit of control unit 8 is communicated with the output of the current detection signal of the first inverter circuit 3, the input of the second voltage testing circuit of control unit 8 is communicated with the output of the voltage detection signal of the second inverter circuit 6, the input of the second current detection circuit of control unit 8 is communicated with the output of the current detection signal of the second inverter circuit 6.
The utility model adopts the control program of AC-DC-DC-AC, and wherein AC-DC adopts Industrial Frequency Transformer to realize, and DC-DC link adopts high frequency transformer to realize, and DC-AC adopts full bridge structure and LC filtering to realize.The advantage of this scheme is that this device has the ability regulating in very wide input voltage range.In addition, the utility model also has overvoltage, under-voltage, overload, overcurrent protection function, has guaranteed equipment safety, reliable.Because DC-DC transform part employing high-frequency step-up transformer is wherein realized, reduced the volume of device, reduced cost, improved the response speed of device and the precision of ac output voltage.
Unstable AC-input voltage 660V ± 30%(462-858V) after processing, step-down transformer (660/110) step-down, rectification (D1-D4), voltage stabilizing (C1) obtain DC bus-bar voltage U1(voltage range: 90-170V), by high-frequency step-up transformer (80/1000), boost and voltage close loop controls that to obtain DC bus-bar voltage U2(be 1000V); DC bus-bar voltage U2 adopts suitable modulation ratio M and SPWM technology, makes M2, N2 obtain SPWM Voltage-output; After L, C3 filtering are processed, the radio-frequency component in the SPWM voltage of M2, N2 output is eliminated, and obtains 50Hz, the output of 660V alternating voltage.
Embodiment two: in conjunction with Fig. 1, present embodiment is described, present embodiment is the further restriction to mining alternating current steady voltage plug described in embodiment one, power frequency step-down transformer 1 adopts 660/110 power frequency step-down transformer.
Embodiment three: present embodiment is described in conjunction with Fig. 1, present embodiment is the further restriction to mining alternating current steady voltage plug described in embodiment one, industrial frequency rectifying circuit 2 comprises the first bridge rectifier and a capacitor C 1, the ac input end correspondence of the first bridge rectifier is communicated with the output of power frequency step-down transformer 1, and a capacitor C 1 is connected in parallel on the DC output end of the first bridge rectifier.
Embodiment four: present embodiment is described in conjunction with Fig. 1 and Fig. 2, present embodiment is the further restriction to mining alternating current steady voltage plug described in embodiment one, the first inverter circuit 3 comprises power tube V1 No. one, No. two power tube V2, No. three power tube V3, No. four power tube V4, a resistance R 1 and four diodes, the source electrode of a power tube V1 is communicated with drain electrode by a diode, the source electrode of No. two power tube V2 is communicated with drain electrode by a diode, the source electrode of No. three power tube V3 is communicated with drain electrode by a diode, the source electrode of No. four power tube V4 is communicated with drain electrode by a diode, a DC output end of the first bridge rectifier is communicated with the drain electrode of a power tube V1 and the drain electrode of No. two power tube V2 simultaneously, another DC output end while of the first bridge rectifier and the source electrode of No. three power tube V3, one end of the source electrode of No. four power tube V4 and a resistance R 1 is communicated with, the other end ground connection of a resistance R 1, the source electrode while of a power tube V1 and the drain electrode of No. three power tube V3, an output of the first inverter circuit 3 is communicated with, the source electrode while of No. two power tube V2 and the drain electrode of No. four power tube V4, another output of the first inverter circuit 3 is communicated with, the output of the first power amplifier of control unit 8 comprises P1, P2, P3 and P4, corresponding P1 is communicated with the grid of a power tube V1, P2 is communicated with the grid of No. two power tube V2, P3 is communicated with the grid of No. three power tube V3, P4 is communicated with the grid of No. four power tube V4, the input current of the first current detection circuit that the current i 1 of the resistance R 1 of flowing through is control unit 8.
The utility model Converting Unit adopts single-phase full bridge inverter power topological structure, in Fig. 2, being respectively power switch pipe switching frequency is 10kHz, duty ratio is 50% pwm control signal, the drive waveforms of V1/V4, V2/V3 and VM1N1 output voltage waveforms, wherein V1 is consistent with V4 drive waveforms, V2 is consistent with V3 drive waveforms, is high-frequency PWM signal.When V1 and V4 conducting, output voltage is+U that, when V2 and V3 conducting, output voltage is-U.The PWM waveform of inverter output is as shown in Fig. 2 lower waveform.PWM ripple obtains direct voltage U2 after high-frequency step-up transformer, high-frequency rectification, C2 filtering.
Embodiment five: in conjunction with Fig. 1, present embodiment is described, present embodiment is the further restriction to mining alternating current steady voltage plug described in embodiment one, high-frequency step-up transformer 4 adopts 80/1000 high-frequency step-up transformer.
Embodiment six: present embodiment is described in conjunction with Fig. 1, present embodiment is the further restriction to mining alternating current steady voltage plug described in embodiment one, high-frequency rectification circuit 5 comprises the second bridge rectifier and No. two capacitor C 2, the ac input end correspondence of the second bridge rectifier is communicated with the output of high-frequency step-up transformer 4, and No. two capacitor C 2 are connected in parallel on the DC output end of the second bridge rectifier.
Embodiment seven: present embodiment is described in conjunction with Fig. 1, present embodiment is the further restriction to mining alternating current steady voltage plug described in embodiment one, the second inverter circuit 6 comprises power tube V5 No. five, No. six power tube V6, No. seven power tube V7, No. eight power tube V8, No. two resistance R 2 and four diodes, the source electrode of No. five power tube V5 is communicated with drain electrode by a diode, the source electrode of No. six power tube V6 is communicated with drain electrode by a diode, the source electrode of No. seven power tube V7 is communicated with drain electrode by a diode, the source electrode of No. eight power tube V8 is communicated with drain electrode by a diode, a DC output end of high-frequency rectification circuit 5 is communicated with the drain electrode of No. five power tube V5 and the drain electrode of No. six power tube V6 simultaneously, another DC output end while of high-frequency rectification circuit 5 and the source electrode of No. seven power tube V7, one end of the source electrode of No. eight power tube V8 and No. two resistance R 2 is communicated with, the other end ground connection of No. two resistance R 2, the source electrode while of No. five power tube V5 and the drain electrode of No. seven power tube V7, an output of the second inverter circuit 6 is communicated with, the source electrode while of No. six power tube V6 and the drain electrode of No. eight power tube V8, another output of the second inverter circuit 6 is communicated with, the output of the second power amplifier of control unit 8 comprises P5, P6, P7 and P8, corresponding P5 is communicated with the grid of No. five power tube V5, P6 is communicated with the grid of No. six power tube V6, P7 is communicated with the grid of No. seven power tube V7, P8 is communicated with the grid of No. eight power tube V8, the input current of the second current detection circuit that the current i 2 of No. two resistance R 2 of flowing through is control unit 8.
Embodiment eight: present embodiment is described in conjunction with Fig. 1, present embodiment is the further restriction to mining alternating current steady voltage plug described in embodiment one, output filter circuit 7 comprises inductance coil L and No. three capacitor C 3, an output of the second inverter circuit 6 is communicated with one end of inductance coil L, the other end while of inductance coil L and one end of No. three capacitor C 3, an output of mining alternating current steady voltage plug is communicated with, another output while of the second inverter circuit 6 and the other end of No. three capacitor C 3, another output of mining alternating current steady voltage plug is communicated with.
Embodiment nine: in conjunction with Fig. 1 to Figure 10, present embodiment is described, present embodiment is the further restriction to mining alternating current steady voltage plug described in embodiment one, control unit 8 adopts TMS320F2812.
DC voltage-stabilizing control principle drawing as shown in Figure 3, by TMS320F2812 sampling output DC bus-bar voltage U2, carries out PI adjusting with given voltage, and changes PWM ripple duty ratio, through each device for power switching V1-V4 of power amplifier rear drive inverter.The PWM voltage waveform of output obtains galvanic current and presses 1000V after over commutation, capacitor filtering; 1000V direct voltage U2 by adopting SPWM control technology and suitable modulation ratio M driving power switching device V5-V8, obtains 50Hz, 660 ± 1% output AC voltage after low-pass filtering L, C3 process.
Driver element in the utility model adopts isolated form power drive chip TLP250 to realize, and this chip can drive 50A/1200V IGBT power switch pipe.Control unit and main circuit are isolated, and have improved the antijamming capability of whole device.Meanwhile, the Miller effect when type of drive that back-pressure is turn-offed can suppress power tube shutoff, prevents misleading when power tube turn-offs.
Voltage detecting circuit, by step-down transformer sampling and outputting voltage, converts the voltage signal sampling to DC quantity through rectification circuit, by the A/D conversion mouthful of same access TMS320F2812 after electric resistance partial pressure, finally by LCD display output voltage.
As shown in Figure 5, the primary current of sampling step-up transformer, when primary current surpasses 30A, by the earth resistance of DC side 0.01 Ω, makes voltage signal be restricted to 0.3V to overload protecting circuit.When the A/D conversion mouthful of TMS320F2812 detects voltage and is greater than 0.3V, TMS320F2812 enters A/D interruption subroutine, now stops exporting PWM ripple, thereby inversion voltage regulation unit is quit work, and plays the effect of protective device.
Current foldback circuit is similar to overload protecting circuit, is the safeguard measure of introducing in order to prevent from occurring short trouble in main circuit.When electric current surpasses certain value (this device is set to 0.6V, i.e. 60A), TMS320F2812 enters interruption, stops exporting PWM ripple.Detailed process is as follows: the inverting input of the voltage signal access voltage comparator that the earth resistance by DC side 0.01 Ω obtains, compares with homophase input voltage.When circuit generation overcurrent, the input voltage of end of oppisite phase is higher than the input voltage of in-phase end, and output becomes low level; output is connected with TMS320F2812 external interrupt port PDPINTA; when low level being detected, TMS320F2812 stops paying out PWM ripple, thereby plays overcurrent protection.
The systems soft ware of the utility model control unit 8: first close interruption before main program starts, the functional modules such as A/D, PWM and variable are carried out to initialization simultaneously, variable involved in program is defined, open afterwards interruption, start the generation of circular wait interrupt event, main program flow as shown in Figure 7.
The utility model PI regulates subprogram to adopt timer to start A/D interruption, and enter break period is 50us at every turn, enters at every turn and interrupts upgrading a SPWM duty ratio, and sinusoidal wave every half period is upgraded duty ratio altogether 200 times.When t++ surpasses 200, carry out a PI and regulate, sinusoidal wave every half period is carried out a PI adjusting.During PI regulates, the set-point of A/D sampled value and program setting compares, when sampled value is less than set-point, and the duty ratio of corresponding each SPWM ripple of proportional increase; When sampled value is greater than set-point, corresponding proportional duty ratio that reduces each SPWM ripple; Thereby make output voltage keep stable.The flow chart that PI regulates as shown in Figure 8.
Fig. 9 and Figure 10 are test result of the present utility model, and wherein the alternating voltage after inversion as shown in Figure 9, is removed radio-frequency component wherein by LC filtering, finally obtains the sinusoidal fundamental wave voltage shown in Figure 10.
Embodiment ten: present embodiment is described in conjunction with Fig. 1, present embodiment is the further restriction to mining alternating current steady voltage plug described in embodiment one, it also comprises liquid crystal display, and the output of the display of control unit 8 is communicated with the signal input part of liquid crystal display.
By voltage sensor sampling input voltage, DC bus-bar voltage, output voltage, electric current, by the working temperature of temperature sensor sampling device, by liquid crystal display, the data that sample are shown in real time, thereby conveniently the running status of device is monitored.
The utlity model has following advantage:
1, with respect to the mining stabilized voltage power supply of tradition, the utility model has reduced the volume and weight of device, has improved the operational efficiency of device;
2, adopt the control core that digital signal processor (DSP) is supply unit, improve the control precision of device;
3, adopt high frequency transformer to realize DC-DC conversion, greatly improve the dynamic characteristic of system, reduced cost simultaneously, improved the reliability of device;
4, good human-computer interaction function, is convenient to device to monitor in real time;
The defencive functions such as 5, overvoltage, overcurrent, overload make device can be safely, operation reliably.
Claims (10)
1. mining alternating current steady voltage plug, it is characterized in that, it comprises power frequency step-down transformer (1), industrial frequency rectifying circuit (2), the first inverter circuit (3), high-frequency step-up transformer (4), high-frequency rectification circuit (5), the second inverter circuit (6), output filter circuit (7) and control unit (8), the input correspondence of power frequency step-down transformer (1) is communicated with the output of colliery down-hole power, the output of power frequency step-down transformer (1) is communicated with the input of industrial frequency rectifying circuit (2), the output of industrial frequency rectifying circuit (2) is communicated with the input of the first inverter circuit (3), the output of the first inverter circuit (3) is communicated with the input of high-frequency step-up transformer (4), the output of high-frequency step-up transformer (4) is communicated with the input of high-frequency rectification circuit (5), the output of high-frequency rectification circuit (5) is communicated with the input of the second inverter circuit (6), the output of the second inverter circuit (6) is communicated with the input of output filter circuit (7), the output that the output of output filter circuit (7) is described stabilized voltage power supply, the output of the first power amplifier of control unit (8) is communicated with the input of the power amplifier of the first inverter circuit (3), the output of the second power amplifier of control unit (8) is communicated with the input of the power amplifier of the second inverter circuit (6), the input of the first voltage detecting circuit of control unit (8) is communicated with the output of the voltage detection signal of the first inverter circuit (3), the input of the first current detection circuit of control unit (8) is communicated with the output of the current detection signal of the first inverter circuit (3), the input of the second voltage testing circuit of control unit (8) is communicated with the output of the voltage detection signal of the second inverter circuit (6), the input of the second current detection circuit of control unit (8) is communicated with the output of the current detection signal of the second inverter circuit (6).
2. mining alternating current steady voltage plug according to claim 1, is characterized in that, power frequency step-down transformer (1) adopts 660/110 power frequency step-down transformer.
3. mining alternating current steady voltage plug according to claim 1, it is characterized in that, industrial frequency rectifying circuit (2) comprises the first bridge rectifier and an electric capacity (C1), the ac input end correspondence of the first bridge rectifier is communicated with the output of power frequency step-down transformer (1), and an electric capacity (C1) is connected in parallel on the DC output end of the first bridge rectifier.
4. mining alternating current steady voltage plug according to claim 1, it is characterized in that, the first inverter circuit (3) comprises a power tube (V1), No. two power tubes (V2), No. three power tubes (V3), No. four power tubes (V4), a resistance (R1) and four diodes, the source electrode of a power tube (V1) is communicated with drain electrode by a diode, the source electrode of No. two power tubes (V2) is communicated with drain electrode by a diode, the source electrode of No. three power tubes (V3) is communicated with drain electrode by a diode, the source electrode of No. four power tubes (V4) is communicated with drain electrode by a diode, a DC output end of the first bridge rectifier is communicated with the drain electrode of a power tube (V1) and the drain electrode of No. two power tubes (V2) simultaneously, another DC output end while of the first bridge rectifier and the source electrode of No. three power tubes (V3), one end of the source electrode of No. four power tubes (V4) and a resistance (R1) is communicated with, the other end ground connection of a resistance (R1), the source electrode while of a power tube (V1) and the drain electrode of No. three power tubes (V3), an output of the first inverter circuit (3) is communicated with, the source electrode while of No. two power tubes (V2) and the drain electrode of No. four power tubes (V4), another output of the first inverter circuit (3) is communicated with, the output of the first power amplifier of control unit (8) comprises P1, P2, P3 and P4, corresponding P1 is communicated with the grid of a power tube (V1), P2 is communicated with the grid of No. two power tubes (V2), P3 is communicated with the grid of No. three power tubes (V3), P4 is communicated with the grid of No. four power tubes (V4), the input current that the electric current (i1) of a resistance (R1) of flowing through is the first current detection circuit of control unit (8).
5. mining alternating current steady voltage plug according to claim 1, is characterized in that, high-frequency step-up transformer (4) adopts 80/1000 high-frequency step-up transformer.
6. mining alternating current steady voltage plug according to claim 1, it is characterized in that, high-frequency rectification circuit (5) comprises the second bridge rectifier and No. two electric capacity (C2), the ac input end correspondence of the second bridge rectifier is communicated with the output of high-frequency step-up transformer (4), and No. two electric capacity (C2) are connected in parallel on the DC output end of the second bridge rectifier.
7. mining alternating current steady voltage plug according to claim 1, it is characterized in that, the second inverter circuit (6) comprises No. five power tubes (V5), No. six power tubes (V6), No. seven power tubes (V7), No. eight power tubes (V8), No. two resistance (R2) and four diodes, the source electrode of No. five power tubes (V5) is communicated with drain electrode by a diode, the source electrode of No. six power tubes (V6) is communicated with drain electrode by a diode, the source electrode of No. seven power tubes (V7) is communicated with drain electrode by a diode, the source electrode of No. eight power tubes (V8) is communicated with drain electrode by a diode, a DC output end of high-frequency rectification circuit (5) is communicated with the drain electrode of No. five power tubes (V5) and the drain electrode of No. six power tubes (V6) simultaneously, another DC output end while of high-frequency rectification circuit (5) and the source electrode of No. seven power tubes (V7), one end of the source electrode of No. eight power tubes (V8) and No. two resistance (R2) is communicated with, the other end ground connection of No. two resistance (R2), the source electrode while of No. five power tubes (V5) and the drain electrode of No. seven power tubes (V7), an output of the second inverter circuit (6) is communicated with, the source electrode while of No. six power tubes (V6) and the drain electrode of No. eight power tubes (V8), another output of the second inverter circuit (6) is communicated with, the output of the second power amplifier of control unit (8) comprises P5, P6, P7 and P8, corresponding P5 is communicated with the grid of No. five power tubes (V5), P6 is communicated with the grid of No. six power tubes (V6), P7 is communicated with the grid of No. seven power tubes (V7), P8 is communicated with the grid of No. eight power tubes (V8), the input current that the electric current (i2) of No. two resistance (R2) of flowing through is the second current detection circuit of control unit (8).
8. mining alternating current steady voltage plug according to claim 1, it is characterized in that, output filter circuit (7) comprises inductance coil (L) and No. three electric capacity (C3), an output of the second inverter circuit (6) is communicated with one end of inductance coil (L), the other end of inductance coil (L) is communicated with an output of one end of No. three electric capacity (C3), mining alternating current steady voltage plug simultaneously, and another output of the second inverter circuit (6) is communicated with the other end of No. three electric capacity (C3), another output of mining alternating current steady voltage plug simultaneously.
9. mining alternating current steady voltage plug according to claim 1, is characterized in that, control unit (8) adopts TMS320F2812.
10. mining alternating current steady voltage plug according to claim 1, is characterized in that, it also comprises liquid crystal display, and the output of display and the signal input part of liquid crystal display of control unit (8) are communicated with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320823829.2U CN203590046U (en) | 2013-12-16 | 2013-12-16 | AC stabilized power supply for mining |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320823829.2U CN203590046U (en) | 2013-12-16 | 2013-12-16 | AC stabilized power supply for mining |
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| CN203590046U true CN203590046U (en) | 2014-05-07 |
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| CN201320823829.2U Expired - Fee Related CN203590046U (en) | 2013-12-16 | 2013-12-16 | AC stabilized power supply for mining |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009648A (en) * | 2014-05-15 | 2014-08-27 | 北京首光艾达科技有限公司 | Plug removal device of oil delivery pipe of oil field and frequency control method |
| CN112072930A (en) * | 2020-08-18 | 2020-12-11 | 邵阳学院 | Safety power supply adopting high-frequency isolation |
| CN112737390A (en) * | 2020-12-25 | 2021-04-30 | 南通大学 | Melt-blown fabric electret power supply based on PWM technology |
| CN112737373A (en) * | 2020-12-25 | 2021-04-30 | 南通大学 | Fuse-spraying cloth electret power supply based on PWM technology full-control rectification and full-control inversion |
-
2013
- 2013-12-16 CN CN201320823829.2U patent/CN203590046U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009648A (en) * | 2014-05-15 | 2014-08-27 | 北京首光艾达科技有限公司 | Plug removal device of oil delivery pipe of oil field and frequency control method |
| CN104009648B (en) * | 2014-05-15 | 2017-03-01 | 北京首光艾达科技有限公司 | Oil field petroleum pipeline de-plugging equipment and control method for frequency |
| CN112072930A (en) * | 2020-08-18 | 2020-12-11 | 邵阳学院 | Safety power supply adopting high-frequency isolation |
| CN112737390A (en) * | 2020-12-25 | 2021-04-30 | 南通大学 | Melt-blown fabric electret power supply based on PWM technology |
| CN112737373A (en) * | 2020-12-25 | 2021-04-30 | 南通大学 | Fuse-spraying cloth electret power supply based on PWM technology full-control rectification and full-control inversion |
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