CN1567675A - Apparatus for monitoring inverter bypass switching - Google Patents
Apparatus for monitoring inverter bypass switching Download PDFInfo
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- CN1567675A CN1567675A CN 03138717 CN03138717A CN1567675A CN 1567675 A CN1567675 A CN 1567675A CN 03138717 CN03138717 CN 03138717 CN 03138717 A CN03138717 A CN 03138717A CN 1567675 A CN1567675 A CN 1567675A
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Abstract
The invention relates to an inverter bypass switching monitoring device, including an AC voltage mutual inductor, an electric network voltage and phase detecting unit, an inverted voltage detecting unit, an AC transducer, a load current detecting unit, an isolation driving circuit, a main-switching device, a crystal vibrator, a reset circuit and a voltage reference circuit, the network voltage is converted by the AC voltage mutual inductor to enter the network voltage and phase detecting unit, and then connects to two input pins of a MCU; the inverted voltage is converted by the AC voltage mutual inductor to enter the inverted voltage detecting unit and then connects with an input pin PTB2 of the MCU; the load current is converted by the AC transducer to enter the load current detecting unit and then connects with an input pin PTB3 of the MCU; the output pin of the MCU connects with the main switching device-the control end of a rapid silicon controlled rectifier through the isolation driving circuit. The structure is reasonable and the switching is short-cut, the safety of the device is high and the use range of the device is wide.
Description
Technical field
The present invention relates to a kind of apparatus for monitoring power supply, specifically a kind of inverter bypass switching monitoring device.
Background technology
We know; along with the development of society, increasing occasion requires to use inverter, as systems such as electric power, communication, finance at present; be used to protect the continuity of some visual plants power supplies, avoid because of faults such as loss of data, network paralysis, protection equipment that dead electricity causes are out of control.When handling inversion output and electrical network bypass, adopt contactor and controllable silicon to switch at present mostly.Adopt the switching time of contactor longer, generally at 10～100mS, this causes faults such as computer crash, equipment misoperation easily, can only be applied in the occasion to not being strict with switching time.Adopt controllable silicon can effectively control switching time, but often occur because of controlling improper phenomenon of damaging device.
Summary of the invention
Technical problem to be solved by this invention is to overcome above-mentioned the deficiencies in the prior art, provides a kind of rational in infrastructure, switches fast eyelash, and device security can be high, the inverter bypass switching monitoring device that the scope of application is wide.
The technical scheme that the present invention solves the problems of the technologies described above employing is: a kind of inverter bypass switching monitoring device, it includes AC voltage transformer, line voltage and phase detection unit, inverter voltage detecting unit, alternating current transmitter, load current detecting unit, isolated drive circuit, main switching device, crystal oscillator and reset circuit, voltage reference circuit, it is characterized in that: line voltage is changed laggard line voltage and phase detection unit through AC voltage transformer SU1, meets two input pin PTB0, PTE5 of single-chip microcomputer (MC68HC908MR16) then; Inverter voltage is changed laggard inverter voltage detecting unit through AC voltage transformer SU2, meets the input pin PTB2 of single-chip microcomputer then; Load current is changed laggard load current detecting unit through alternating current transmitter SA1, meets the input pin PTB3 of single-chip microcomputer then; Output pin PTC0, the PTC6 of single-chip microcomputer connects the control end of the fast controllable silicon G1～G4 of main switching device behind isolated drive circuit.
The present invention is based on digital observing and controlling, with the high-speed microprocessor is to realize prerequisite, by detection to electrical network and inverter voltage, especially increased detection to load current and electrical network phase place, carry out intelligent decision and control, optimized the control mode of hardware, against existing technologies, it has shortened switching time as much as possible under the prerequisite that guarantees device safety, maximum delay is 3mS during from the tangential inversion of electrical network, has realized during from the tangential electrical network of inversion " zero propagation ".Switching time of the present invention fast eyelash, device security can be high, the scope of application is wide.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a composition frame chart of the present invention.
Fig. 2 is an embodiment of the invention circuit connection diagram.
Embodiment
As can be seen from Figure 1, a kind of inverter bypass switching monitoring device, it includes AC voltage transformer, line voltage and phase detection unit, inverter voltage detecting unit, alternating current transmitter, load current detecting unit, isolated drive circuit, main switching device, crystal oscillator and reset circuit, voltage reference circuit, line voltage is changed laggard line voltage and phase detection unit through AC voltage transformer, connects two input pins of single-chip microcomputer then; Inverter voltage is changed laggard inverter voltage detecting unit through AC voltage transformer, connects the input pin of single-chip microcomputer then; Load current is changed laggard load current detecting unit through the alternating current transmitter, connects the input pin of single-chip microcomputer then; The output pin of single-chip microcomputer connects the control end of the fast controllable silicon G1～G4 of main switching device behind isolated drive circuit.The present invention also is provided with communication interface and alarm output dry contact, to carry out communication and warning.Above-mentioned AC voltage transformer SU1, SU2, the composition structure of alternating current transmitter SA1 belongs to prior art, and this does not describe in detail.
Fig. 2 is an embodiment of the invention circuit connection diagram.As can be seen from Figure 2, line voltage is changed laggard line voltage and phase detection unit through AC voltage transformer SU1, meets two input pin PTB0, PTE5 of single-chip microcomputer (MC68HC908MR16) then.R42, C41 suppress to disturb in line voltage and the phase detection unit, and U8A is as follower, and U8B is converted to signal amplitude in 0～5V scope as adder, connects single-chip microcomputer the 7th pin then, and D41 plays the amplitude limit effect; U9A plays and signs effect mutually as the voltage comparator with return difference, and its output connects 1 pin of U10A schmitt inverter, and U10A the 2nd pin connects single-chip microcomputer the 41st pin.
Inverter voltage is changed laggard inverter voltage detecting unit through AC voltage transformer SU2, meets the input pin PTB2 of single-chip microcomputer then; R52, C51 suppress to disturb in the inverter voltage detecting unit, and U7A is as follower, and U7B is converted to signal amplitude in 0～5V scope as adder, connects single-chip microcomputer the 9th pin then, and D51 plays the amplitude limit effect.
Load current is changed laggard load current detecting unit through alternating current transmitter SA1, meets the input pin PTB3 of single-chip microcomputer then; R32, C31 suppress to disturb in the load current detecting unit, and U6A is as follower, and U6B is converted to signal amplitude in 0～5V scope as adder, connects single-chip microcomputer the 10th pin then, and D31 plays the amplitude limit effect.
Output pin PTC0, the PTC6 of single-chip microcomputer connects the control end of the fast controllable silicon G1～G4 of main switching device behind isolated drive circuit.15 of single-chip microcomputer, 23 pin are through the photoelectric isolating circuit of resistance R 63～R67 and optocoupler ISO4, ISO5 composition in the isolated drive circuit, connect 1,6 pin of U11, NOR gate U11A and U11B are connected into interlock circuit, and the output pin 3,4 of U11 connects 1,5 pin with door U12 respectively; R61, R62, D61, C61, C62 and U3 constitute oscillating circuit, and oscillating impulse connects 2,6 pin of U12, is subjected to 1, the 5 foot control systems of U12 respectively.R68～R613, D62～D66, C63, C64 and Q2 produce the control input end that a pair of isolated controlling power supply meets controllable silicon G1, G2 respectively, and R614～R619, D67～D71, C65, C66 and Q3 produce another control input end that isolated controlling power supply is met controllable silicon G3, G4 respectively.Main switching device adopts two controllable silicons instead also, without bidirectional triode thyristor, avoids the commutation ability, and triggering mode adopts impulse train.
Capacitor C 11 in crystal oscillator and the reset circuit, C12 and crystal oscillator X1 form resonant tank, and R13 is as feedback resistance, and the 7th pin of U2 connects+links to each other with 49 pin of single-chip microcomputer behind the 5V power supply through R11, and U2 has the function of electrification reset and house dog.
6 of U4,8 pin ground connection in the voltage reference circuit, the 1st pin through R71 connect+12V after generation+2.5V benchmark, U13A is an inverter, generation-2.5V benchmark, R74, R75, R76, C72, U13B constitute the twice inverting amplifier, and generation+5V benchmark connects single-chip microcomputer the 16th, 18 pin.
This inverter bypass switching monitoring device also is provided with communication interface and alarm output dry contact.Resistance R 21～R26 and optocoupler ISO1～ISO3 constitutes buffer circuit in the communication interface, after isolating, 47 pin of single-chip microcomputer connect 4 pin of U5, after isolating, 46 pin of single-chip microcomputer connect 1 pin of U5, after isolating, 6 pin of single-chip microcomputer connect 2,3 pin of U5, R27 is for eliminating the build-out resistor of transmission reflection, and U5 realizes the RS485 communication interface.Alarm output dry contact is made of outputting alarm signal when plant failure R81, D81, Q1, J1.
Claims (2)
1. inverter bypass switching monitoring device, it includes AC voltage transformer, line voltage and phase detection unit, inverter voltage detecting unit, alternating current transmitter, load current detecting unit, isolated drive circuit, main switching device, crystal oscillator and reset circuit, voltage reference circuit, it is characterized in that: line voltage is changed laggard line voltage and phase detection unit through AC voltage transformer SU1, meets two input pin PTB0, PTE5 of single-chip microcomputer (MC68HC908MR16) then; Inverter voltage is changed laggard inverter voltage detecting unit through AC voltage transformer SU2, meets the input pin PTB2 of single-chip microcomputer then; Load current is changed laggard load current detecting unit through alternating current transmitter SA1, meets the input pin PTB3 of single-chip microcomputer then; Output pin PTC0, the PTC6 of single-chip microcomputer connects the control end of the fast controllable silicon G1～G4 of main switching device behind isolated drive circuit.
2. inverter bypass switching monitoring device according to claim 1 is characterized in that: also be provided with communication interface and alarm output dry contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03138717 CN1567675A (en) | 2003-06-25 | 2003-06-25 | Apparatus for monitoring inverter bypass switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03138717 CN1567675A (en) | 2003-06-25 | 2003-06-25 | Apparatus for monitoring inverter bypass switching |
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| Publication Number | Publication Date |
|---|---|
| CN1567675A true CN1567675A (en) | 2005-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03138717 Pending CN1567675A (en) | 2003-06-25 | 2003-06-25 | Apparatus for monitoring inverter bypass switching |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340111B (en) * | 2007-07-04 | 2010-12-01 | 中山新亚洲电业有限公司 | Uninterrupted switching system of commercial power and generated power and method thereof |
-
2003
- 2003-06-25 CN CN 03138717 patent/CN1567675A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340111B (en) * | 2007-07-04 | 2010-12-01 | 中山新亚洲电业有限公司 | Uninterrupted switching system of commercial power and generated power and method thereof |
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