CN104868580B - CIT asynchronous uninterruptible static diverter switch system and control method thereof - Google Patents

CIT asynchronous uninterruptible static diverter switch system and control method thereof Download PDF

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Publication number
CN104868580B
CN104868580B CN201410228261.9A CN201410228261A CN104868580B CN 104868580 B CN104868580 B CN 104868580B CN 201410228261 A CN201410228261 A CN 201410228261A CN 104868580 B CN104868580 B CN 104868580B
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China
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output
switching
switch
microprocessor
current
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CN201410228261.9A
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Chinese (zh)
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CN104868580A (en
Inventor
盛义良
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安徽华盛科技控股股份有限公司
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Publication of CN104868580A publication Critical patent/CN104868580A/en
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Abstract

The invention discloses a CIT asynchronous uninterruptible static diverter switch system and a control method thereof. An input end of a microprocessor receives an external switch order and is connected with an output end of a signal conversion circuit; the output end of the microprocessor is respectively connected with an input end of a mains supply output circuit diverter switch and an input end of an inverter output circuit diverter switch; the output end of the mains supply output circuit diverter switch is connected with the output end of the inverter output circuit diverter switch and out current is outputted to an external load via a current sensor. When the microcontroller acquires a switch order for switching output of the inverter to output of the mains supply, the microcontroller judges a current output direction according to current outputted by a resistor R, switch is controlled, switch between output voltage of the inverter and voltage of the mains supply in any phase difference condition can be ensured, no short circuit current is generated, the load device can be prevented from being damaged, and uninterruptible and reliable switch between output voltage of the inverter and voltage of the mains supply in any phase difference condition can be realized.

Description

The asynchronous static switching switching systems free of discontinuities of CIT and its control method

Technical field

The present invention relates to CIT static switching fields free of discontinuities, more particularly to a kind of asynchronous static switching switches free of discontinuities of CIT System and its control method.

Background technology

UPS devices are made up of three essential parts, i.e. commutator, inverter, switching switch.The switching of modern UPS devices Switch, is constituted using bidirectional triode thyristor, the switching of on line type UPS device switch, and under normal circumstances, inverter output loop is opened Pass is always turned on and the switch of civil power side is to disconnect, and when fault of converter, the switch of civil power side is connected immediately, and inverter The switch of output loop is then turned off naturally until current over-zero.This mode is only in inverter output voltage and civil power phase place Under synchronization and magnitude of voltage same case, switching switch ability normal work, when inverter output voltage is differed with line voltage When, in handoff procedure, just have short circuit current and flow through switching switch, when the phase place not phase of inverter output voltage and line voltage Meanwhile, this short circuit current is likely to be breached device and cannot bear and then damage.

From the foregoing, the switching using bidirectional triode thyristor is switched, it is impossible to which the short circuit current and device when solving switching is damaged Bad problem, thus the reliability of system cannot be guaranteed, therefore, relevant UPS equipment switchers control obviously needs further Improve, to seek feasible solution.

The content of the invention

To solve technical problem present in background technology, the present invention proposes that a kind of asynchronous static switchings free of discontinuities of CIT are opened Relation is united and its control method.

A kind of asynchronous static switching switching system free of discontinuities of CIT proposed by the present invention, including the conversion of current sensor, signal Circuit, microprocessor, switching control drive circuit, civil power output circuit switching switch, inverter output circuit switching switch, it is micro- The input of processor receives outside switching command and connects the outfan of signal conversion circuit, the outfan of microprocessor The input for switching the input and inverter output circuit switching switch of switch with civil power output circuit respectively is connected, and civil power is defeated The outfan that the outfan for going out circuit changing switch switches switch with inverter output circuit links together, and is passed by electric current Sensor output is to external loading;

Civil power output circuit switching switch includes that the first one-way SCR switch CR1 and second that inverse parallel connects unidirectionally may be used Control transwitch CR2, inverter output circuit switching switch includes the 3rd one-way SCR switch CR3 and the 4th that inverse parallel connects One-way SCR switchs CR4;

Switching control drive circuit includes the first drive control device, the second drive control device, the 3rd drive control device and the Four drive control devices, the first drive control device is connected between the input of microprocessor and the first one-way SCR switch CR1, Second drive control device is connected between the input of microprocessor and the second one-way SCR switch CR2, the 3rd drive control Device is connected between the input of microprocessor and the 3rd one-way SCR switch CR3, and the 4th drive control device is connected to micro- place Between the input of reason device and the 4th one-way SCR switch CR4;

Current sensor includes primary coil, output winding and bridging coil, and the outfan of the bridging coil is jumped to The outfan of the external loading, between the outfan and the outfan of external loading of the bridging coil resistance R is in series with, The outfan of series resistance R connects the input of signal conversion circuit.

The present invention also proposes a kind of control method of the asynchronous static switching switching systems free of discontinuities of CIT, including:

When microprocessor obtains the switching command by inverter output switching to city's electricity output, microprocessor is according to resistance The electric current of R outputs judges output current direction, when output current is positive, microprocessor output order:CR1 conductings, CR2 are closed It is disconnected, when positive output current zero crossing, output order:CR1, CR2, CR3, CR4 are all turned on;When output current is negative sense When, output order:CR3 conductings, CR4 shut-offs, when negative current zero crossing, output order:CR1, CR2, CR3, CR4 all lead It is logical;

When microprocessor obtains the switching command for exporting civil power output switching to inverter, microprocessor is according to resistance The electric current of R outputs judges the direction of output current, when output current is positive, output order:CR2 conductings, CR1 shut-offs, treat During positive output current zero crossing, output order:CR1, CR2, CR3, CR4 are all turned on;When output current is negative sense, output Instruction:CR4 conductings, CR3 shut-offs, when negative current zero crossing, output order:CR1, CR2, CR3, CR4 are all turned on.

In the present invention, the asynchronous static state free of discontinuities of a kind of CIT for being proposed switches switching system and its control method, by micro- The input of processor receives outside switching command and connects the outfan of signal conversion circuit, the outfan point of microprocessor The input for not switching the input and inverter output circuit switching switch of switch with civil power output circuit is connected, city's electricity output The outfan that the outfan of circuit changing switch switches switch with inverter output circuit links together, and by current sense Device output is to external loading, when microprocessor obtains the switching command by inverter output switching to city's electricity output, microprocessor Device judges output current direction, control switching, it can be ensured that inverter output voltage and line voltage according to the electric current that resistance R is exported Switch in the case of random phase difference, and do not produce short circuit current, so that load device is damaged, so as to realize inverter Output voltage and line voltage switch in the free of discontinuities reliable of random phase difference.

Description of the drawings

Fig. 1 is a kind of asynchronous static switching switching system schematic diagrams free of discontinuities of CIT proposed by the present invention.

Fig. 2 is a kind of control schematic diagram of the asynchronous static switching switching systems free of discontinuities of CIT proposed by the present invention.

Fig. 3 is a kind of control flow chart of the asynchronous static switching switching systems free of discontinuities of CIT proposed by the present invention.

Specific embodiment

As illustrated in fig. 1 and 2, Fig. 1 is that a kind of asynchronous static switching switching systems free of discontinuities of CIT proposed by the present invention are illustrated Figure, Fig. 2 is a kind of control schematic diagram of the asynchronous static switching switching systems free of discontinuities of CIT proposed by the present invention.

See figures.1.and.2, a kind of asynchronous static switching switching system free of discontinuities of CIT proposed by the present invention, including electric current passes Sensor 5, signal conversion circuit 9, microprocessor 6, the first switching control drive circuit 7, the second switching control drive circuit 8, city Electricity output circuit changing switch 3, inverter output circuit switching switch 4;

Microprocessor 6 is used to receive the outside switching command S and current sampling signal I in system, and its input connects The outfan of signal conversion circuit 9 is connect, the outfan of microprocessor 6 switches respectively the input of switch 3 with civil power output circuit The input for switching switch 4 with inverter output circuit connects, and the outfan of civil power output circuit switching switch 3 is defeated with inverter The outfan for going out circuit changing switch 4 links together, and by the output of current sensor 5 to external loading;

Civil power output circuit switching switch 3 is used to be switched on or switched off mains supply 1, and it includes the first list that inverse parallel connects To reverse-blocking tetrode thyristor CR1 and the second one-way SCR switch CR2, inverter output circuit switching switch 4 is used to be switched on or switched off Inverter power supply 2, it includes that the 3rd one-way SCR that inverse parallel connects switchs CR3 and the 4th one-way SCR switch CR4;

First switching control drive circuit 7 is used to be converted to the control signal that microprocessor 6 is exported that civil power can be controlled The signal of output circuit switching switch 3, it includes the first drive control device DR1 and the second drive control device DR2, and second cuts Changing control drive circuit 8 can control the switching of inverter output circuit for the control signal that microprocessor 6 is exported to be converted to The signal of switch 4, it includes the 3rd drive control device DR3 and the 4th drive control device DR4, the connection of the first drive control device DR1 Between the input that the one-way SCR of microprocessor 6 and first switchs CR1, the second drive control device DR2 is connected to microprocessor Between the input of the one-way SCR of device 6 and second switch CR2, the 3rd drive control device DR3 is connected to microprocessor 6 and the 3rd Between the input of one-way SCR switch CR3, and the 4th drive control device DR4 to be connected to microprocessor 6 and the 4th unidirectional Between the input of reverse-blocking tetrode thyristor CR4;

Current sensor 5 includes primary coil, output winding and bridging coil 51, and the outfan for bridging coil 51 is jumped to The outfan of external loading L, between the outfan and the outfan of external loading L of bridging coil 51 resistance R, resistance are in series with The outfan of R connects the input of signal conversion circuit 9, and current sampling signal I is input to into signal conversion circuit 9;In bridging The purpose that resistance R is in series between the outfan of coil 51 and the outfan of external loading L is prevented when output current is 0, Current sampling signal I disappears, and causes microprocessor 6 accurately to judge.

Switch in the normal use of switching system in the asynchronous static state free of discontinuities of the CIT of the present embodiment, the first one-way SCR is opened Close CR1 and the 3rd one-way SCR switchs CR3 for off-state, and the second one-way SCR switch CR2 and the 4th unidirectionally may be used Control transwitch CR4 is on-state, and the positive output current of inverter power supply 2 switchs CR3 by the 3rd one-way SCR, and inverse The negative sense output current for becoming device power supply 2 switchs CR4 by the 4th one-way SCR, and a part for the output current is passed by electric current The output of sensor 5 is to external loading L, while another part of output current generates electricity by the bridging coil 51 of current sensor 5 Stream sampled signal I, current sampling signal I are converted into the receivable numeral letter of microprocessor 6 through signal conversion circuit 9 Number.

As shown in figure 3, Fig. 3 is a kind of controlling stream of the asynchronous static switching switching systems free of discontinuities of CIT proposed by the present invention Cheng Tu.

With reference to Fig. 3, the control method of the asynchronous static switching switching system free of discontinuities of CIT proposed by the present invention, including:

When microprocessor 6 obtains the switching command S for exporting the output switching of inverter power supply 2 to mains supply 1, microprocessor Device 6 judges output current direction according to the current sampling signal I that Jing signal conversion circuits 9 are changed, when output current is positive, The output order of microprocessor 6:CR1 conductings, CR3 shut-offs, so as to control the first drive control device DR1 and the second drive control device DR2 drives CR1 conductings, CR2 shut-offs, when positive output current zero crossing, output order:CR1, CR2, CR3, CR4 all lead It is logical, so as to drive CR1, CR2, CR3, CR4 to all turn on;When output current is negative sense, the output order of microprocessor 6:CR3 leads Logical, CR4 shut-offs, so as to control the 3rd drive control device DR3 and the 4th drive control device DR4, drive CR3 conductings, CR4 shut-offs, When negative current zero crossing, output order:CR1, CR2, CR3, CR4 are all turned on, so as to drive CR1, CR2, CR3, CR4 complete Portion turns on;

Microprocessor 6 obtains the switching command S for exporting the output switching of mains supply 1 to inverter power supply 2, microprocessor 6 judge output current direction according to the current sampling signal I of the conversion of Jing signal conversion circuits 9, when output current is positive, The output order of microprocessor 6:Output order:CR2 conductings, CR1 shut-offs, drive so as to control the second drive control device DR2 and first Movement controller DR1 drives CR2 conductings, CR1 shut-offs, when positive output current zero crossing, output order:CR1、CR2、CR3、 CR4 is all turned on, so as to drive CR1, CR2, CR3, CR4 to all turn on;When output current is negative sense, microprocessor 6 is exported Instruction:CR4 conductings, CR3 shut-offs, so as to control the 4th drive control device DR4 and the 3rd drive control device DR3, drive CR4 to lead Logical, CR3 shut-offs, when negative current zero crossing, output order:CR1, CR2, CR3, CR4 are all turned on, so as to drive CR1, CR2, CR3, CR4 are all turned on.

Wherein, switching command S is connected to from microprocessor 6, it is unidirectional controllable to wait to connect switching switch one is connected first The time of the drive signal of transwitch is less than 50 microseconds.

In the present embodiment, the asynchronous static switching switching systems free of discontinuities of CIT for being proposed and its control method, by micro- The input of processor 6 receives outside switching command S and connects the outfan of signal conversion circuit 9, the output of microprocessor 6 End switches respectively the input of the input and inverter output circuit switching switch 4 of switch 3 with civil power output circuit and is connected, city The outfan that the outfan of electricity output circuit changing switch 3 switches switch 4 with inverter output circuit links together, and passes through External loading L is arrived in the output of current sensor 5, when microprocessor 6 obtains that the output switching of inverter power supply 2 is defeated to mains supply 1 During the switching command for going out, microprocessor 6 judges output current direction, control switching, it can be ensured that inverse according to the electric current that resistance R is exported Switch in the case of change device output voltage and line voltage random phase difference, and do not produce short circuit current, so that external loading Device is damaged, so as to realize the free of discontinuities reliable switching of inverter output voltage and line voltage in random phase difference.

The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto, Any those familiar with the art the invention discloses technical scope in, technology according to the present invention scheme and its Inventive concept equivalent or change in addition, all should be included within the scope of the present invention.

Claims (1)

1. a kind of asynchronous static state free of discontinuities of CIT switches switching system, it is characterised in that including current sensor (5), signal conversion Circuit (9), microprocessor (6), the first switching control drive circuit (7), the second switching control drive circuit (8), city's electricity output Circuit changing switch (3), inverter output circuit switching switch (4), the input of microprocessor (6) receives outside switching command And connect the outfan of signal conversion circuit (9), the outfan of microprocessor (6) is switched respectively with the switching of civil power output circuit (3) the input connection of input and inverter output circuit switching switch (4), civil power output circuit switching switch (3) The outfan that outfan switches switch (4) with inverter output circuit links together, and is arrived by current sensor (5) output External loading;
Civil power output circuit switching switch (3) switchs CR1 and second and unidirectionally may be used including the first one-way SCR that inverse parallel connects Control transwitch CR2, the 3rd one-way SCR that inverter output circuit switching switch (4) connect including inverse parallel switch CR3 with 4th one-way SCR switchs CR4;
First switching control drive circuit (7) includes the first drive control device DR1 and the second drive control device DR2, and second Switching control drive circuit (8) includes the 3rd drive control device DR3 and the 4th drive control device DR4, the first drive control device DR1 It is connected between the input of microprocessor (6) and the first one-way SCR switch CR1, the second drive control device DR2 is connected to Between the input of microprocessor (6) and the second one-way SCR switch CR2, the 3rd drive control device DR3 is connected to microprocessor Device (6) and the 3rd one-way SCR switch CR3 input between, the 4th drive control device DR4 be connected to microprocessor (6) and Between the input of the 4th one-way SCR switch CR4;
Current sensor (5) includes primary coil, output winding and bridging coil (51), bridges the outfan bridging of coil (51) To the outfan of external loading L, resistance R is in series between the outfan and the outfan of external loading L of bridging coil (51), The input of outfan connection signal conversion circuit (9) of resistance R;
The method of the asynchronous static switching switching systems free of discontinuities of the described CIT of control, including:
When microprocessor (6) obtains the switching command by inverter output switching to city's electricity output, microprocessor (6) is according to electricity The electric current of resistance R outputs judges output current direction, when output current is positive, microprocessor (6) output order:CR1 conductings, CR2 is turned off, when positive output current zero crossing, output order:CR1, CR2, CR3, CR4 are all turned on;When output current is During negative sense, output order:CR3 conductings, CR4 shut-offs, when negative current zero crossing, output order:CR1, CR2, CR3, CR4 are complete Portion turns on;
When microprocessor (6) obtains the switching command for exporting civil power output switching to inverter, microprocessor (6) is according to electricity The electric current of resistance R outputs judges the direction of output current, when output current is positive, output order:CR2 conductings, CR1 shut-offs, When positive output current zero crossing, output order:CR1, CR2, CR3, CR4 are all turned on;It is defeated when output current is negative sense Go out instruction:CR4 conductings, CR3 shut-offs, when negative current zero crossing, output order:CR1, CR2, CR3, CR4 are all turned on.
CN201410228261.9A 2014-05-27 2014-05-27 CIT asynchronous uninterruptible static diverter switch system and control method thereof CN104868580B (en)

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CN2831570Y (en) * 2005-05-30 2006-10-25 苏建国 Arc protector of power cable
WO2009084354A1 (en) * 2007-12-27 2009-07-09 Kabushiki Kaisha Yaskawa Denki Winding change-over switch of three-phase ac motor
CN102882268B (en) * 2012-08-27 2015-02-04 青岛经济技术开发区创统科技发展有限公司 Undisturbed uninterruptible power supply device

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