CN1027522C - Pulsewidth-modulated inverter able to prevent short circuit - Google Patents
Pulsewidth-modulated inverter able to prevent short circuit Download PDFInfo
- Publication number
- CN1027522C CN1027522C CN 92111110 CN92111110A CN1027522C CN 1027522 C CN1027522 C CN 1027522C CN 92111110 CN92111110 CN 92111110 CN 92111110 A CN92111110 A CN 92111110A CN 1027522 C CN1027522 C CN 1027522C
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- circuit
- brachium pontis
- input
- lower brachium
- output
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Abstract
The present invention relates to a PWM inverter capable of preventing the conduction-through short circuit phenomenon, which is composed of a main circuit for an upper bridge arm, a main circuit for a lower bridge arm, a current sensor, a detection circuit, a fault diagnosis circuit and a fault handling circuit, latch memorizing and display circuit. The present invention adopts a current signal of the main current for detecting the upper bridge arm or the lower bridge arm to control the conducting state of a gate circuit of the lower bridge arm or the upper bridge arm and a switching element, so the conduction-through short circuit phenomenon of the upper bridge arm and the lower bridge arm can not occur. In addition, the present invention also has the functions of fault memorization, latching, display, etc., which is favorable to the running, the debugging and the maintenance of the PWM inverter. Due to adoptig an exclusive or effective isolation coupled structure, the present invention has the advantage of strong antijamming performance.
Description
The invention belongs to a kind of upper and lower brachium pontis of same phase main circuit that prevents and open the pulse width modulation of short circuit (PULES WIDTH MODULATION is hereinafter to be referred as " PWM ") inverter simultaneously.
The PWM inverter can be applicable among the various occasions, and for example, ac variable frequency speed regulation just need be used the PWM inverter.In the use of PWM inverter, one of the most serious fault that must prevent is that last, the brachium pontis of the same phase of converter main circuit opened short circuit simultaneously.This also is the current problem that will study for the reliability that improve to exchange speed governing frequently.For the inverter of non-self cut-off device, mostly be at energy storage capacitor loop series connection non-linear element and inductance element, with the rate of change and the peak value of limiting short-circuit current; For the inverter of self cut-off device, generally all be to pull off base drive signal by the overcurrent protection action, force element from turn-offing; Also have plenty of the voltage that detects two switch elements simultaneously, when two switch elements are all opened, just pull off base drive signal immediately, force element to turn-off.Yet; these methods all just force element to turn-off after short circuit takes place; because the rate of change of energy-storage capacitor direct short-circuit discharging current is very big; when forcing element to turn-off; short circuit current by element may rise very big; therefore, such short-circuit protection is a kind of passive, has bigger danger.
Task of the present invention is to propose a kind of new constituted mode that can prevent the upper and lower bridge arm direct pass short circuit of PWM inverter effectively, and automatic protective system.
The inverter of upper and lower bridge arm direct pass short circuit that prevents of the present invention is constructed as follows:
Upper and lower brachium pontis main circuit (1 in same phase
On, 1
Down) in a current sensor (4) and testing circuit (5) respectively are set, the testing circuit (5 of upper and lower bridge arm
On, 5
Down) output signal deliver to respectively and drive down the gate circuit (6 of last brachium pontis
Down, 6
On) input and deliver to fault diagnosis circuit (7 in the upper and lower brachium pontis
On, 7
Down); Drive upper and lower brachium pontis transistor switch element (2
Down, 2
On) drive input signal (8
Down, 8
On) also deliver to the fault diagnosis circuit (7 in the upper and lower brachium pontis simultaneously
On, 7
Down); The output of the fault diagnosis circuit in the same brachium pontis (7) and drive input signal (8) all are connected to troubleshooting and latch the input interface of memory circuit (9), and troubleshooting and the output that latchs memory circuit (9) are connected to fault display circuit (10) and heterogeneous synthetic circuit (11), heterogeneous synthetic circuit (11
On, 11
Down) output by belonging to mutually respectively and the corresponding gate circuit (6 that belongs to upper and lower brachium pontis mutually of distributing
On, 6
Down) input link.
The inverter that prevents shoot through of the present invention, its operation principle are the drive signals that the current signal of the utilization arbitrary brachium pontis switch element of detection (2) removes to block another brachium pontis switch element.For example, when the switch element (2 of last brachium pontis
On) when opening, testing circuit (5
On) " electric current is arranged " signal that can open by brachium pontis in current sensor (4) acquisition, simultaneously detected current signal is delivered to down the gate circuit (6 of brachium pontis
Down) an input, to block down brachium pontis switch element (2
Down) drive signal; Vice versa for upper and lower brachium pontis.
Fault diagnosis circuit (7) is accepted the drive input signal (8) of testing circuit (5) and another brachium pontis of same brachium pontis simultaneously.Method for diagnosing faults is that as above the brachium pontis switch element (2
On) when opening, then testing circuit (5
On) will obtain the signal of " electric current is arranged ", and block brachium pontis switch element (2 down
Down) open signal, when opening switch element (2
Down) drive input signal (8
Down) after the arrival,, switch element (2 is described then if last brachium pontis still " has electric current "
On) also do not turn-off switch element (2
Down) be blocked continuing, after the buffer time through △ t, as switch element (2
On) still " electric current is arranged " and pass through, then fault diagnosis circuit (7
On) judgement switch element (2
On) fault is arranged, and the output fault-signal.In like manner, diagnosable brachium pontis switch element (2 down
Down) fault.
Troubleshooting and latch memory circuit (9) and accept fault diagnosis signal and drive input signal (8) in the same brachium pontis simultaneously.After receiving the signal that " fault arranged " from fault diagnosis circuit (7), export a signal immediately, block corresponding heterogeneous brachium pontis in order to avoid the load phase-deficient operation.At this moment, inverter does not power to the load, and load current decays to zero through fly-wheel diode (3), and each all mutually current sensor (4) is all sent " not having electric current " normal signal, and at this moment, inverter is self-starting again, and continues to power to the load.If the primary fault of contingency then restarts and send electricity success, load continues operation, and fault logic circuits has been remembered fault this time; If permanent fault, the startup once more of inverter will make troubleshooting and latch memory circuit (9) by aforesaid step process fault, but after the memory fault second time, just not allow to have started inverter once more, and fault latch is shown, handle in order to checking.
In PWM inverter of the present invention, mode that can be as shown in Figure 2, in output AND circuit (6) input, fault diagnosis circuit (7) and the troubleshooting of heterogeneous synthetic circuit (11) shown in Figure 1 and latch between memory circuit (9) input, can add input circuit (12), even the output signal of drive input signal (8) and heterogeneous synthetic circuit (11) is all sent into the input of input circuit (12) earlier, and the upper and lower brachium pontis output of input circuit (12) (8 '
On, 8 '
Down) difference AND circuit (6
On, 6
Down), fault diagnosis circuit (7
Down, 7
On) and with troubleshooting and latch memory circuit (9
On, 9
Down) input link.The effect that adds input circuit is the independence that can increase this circuit.
The PWM inverter that prevents upper and lower bridge arm direct pass short circuit of the present invention, can be used for the occasion that various needs use inverter, no matter be that heterogeneous (three-phase) inverter or half-bridge converter all can be suitable for, as long as increase corresponding number by structure of the present invention.According to inverter of the present invention, can eliminate the possibility that the upper and lower bridge wall of inverter is opened simultaneously from basic principle, from the work of actual device, also prove this point, thereby improved the reliability of switch element and inverter work greatly.Reason whatsoever, when inverter produces non-normal working, in the chopping cycle of a pulse width modulation, just finish automatic failure judgement and handling failure, memory is simultaneously latched and is shown, has brought very big convenience for like this operation, debugging, maintenance, troubleshooting.
Inverter of the present invention after changing part-structure and part applicable to multiple switch element, also can realize after the memory fault first time with regard to locking signal, maybe after the memory fault first time, allow again to start once, but no longer allow the secondary function of starting.
The said inverter of the present invention also has stronger antijamming capability.
Accompanying drawing 1: the PWM inverter block diagram that can prevent upper and lower bridge arm direct pass short circuit;
Accompanying drawing 2: the PWM inverter block diagram that prevents upper and lower bridge arm direct pass short circuit with strong independence;
Accompanying drawing 3: the PWM inverter block diagram that prevents upper and lower bridge arm direct pass short circuit with big applicable surface;
Accompanying drawing 4: base drive circuit.
Below in conjunction with accompanying drawing inverter of the present invention is made further supplementary notes.
Accompanying drawing 1 and accompanying drawing 2 have been done more detailed description in the component part of this specification in front, need to prove, at accompanying drawing 1, the label of being indicated in accompanying drawing 2 and the accompanying drawing 3: (13) are base drive circuit, and base drive circuit (13) is the gate circuit (6 that is placed in upper and lower brachium pontis
On, 6
Down) and upper and lower brachium pontis transistor switch element (2
On, 2
Down) between.
No matter as seen the XOR effective isolation coupling circuit schematic diagram that provides from accompanying drawing 4 be gate circuit (6
On, 6
Down) output or two outputs of optocoupler drive circuit (14), have only when an output high level, another is simultaneously during output low level, just can make the some switch elements (2) in the upper and lower brachium pontis obtain effective base drive signal, otherwise, export high level or while output low level simultaneously when two end points, all can not make switch element (2) obtain the base drive signal of opening.
Accompanying drawing 3 is a kind of PWM inverters that prevent shoot through with broad applicable surface.In this description to accompanying drawing 3, just with accompanying drawing 1, components identical and circuit in the accompanying drawing 2 still adopt identical drawing numbering, only different version are described.Switch element in the accompanying drawing 3 (2), fly-wheel diode (3), testing circuit (5), fault diagnosis circuit (7), the structures such as the effective isolation coupling of XOR of base drive circuit (13) are all identical with aforesaid content with operation principle; Fault diagnosis circuit (7) in the accompanying drawing 3 described PWM inverters, directly output signal is delivered to after the fault after diagnosing and latched memory, display circuit (18), latch, remember and show fault, simultaneously, latch memory, display circuit (18) through heterogeneous synthetic circuit (11
Down, 11
On) up and down the gate circuit of brachium pontis (6) send out also locking signal, as long as primary fault promptly occurred, this circuit does not just allow inverter to restart.This circuit is more simple than aforementioned circuit, and not only can use crystalline substance to explain pipe and make switch element, but also can use transistor, power field effect pipe, and insulated gate bipolar transistors etc. are as switch element.
Claims (5)
1, a kind of PWM inverter that prevents shoot through is characterized in that, at the upper and lower brachium pontis (1 of same phase main circuit
On, 1
Down) in a current sensor (4) and testing circuit (5) respectively are set, upper and lower brachium pontis testing circuit (5
On, 5
Down) output respectively with upper and lower brachium pontis in gate circuit (6
Down, 6
On) input and the fault diagnosis circuit (7 in the upper and lower brachium pontis
On, 7
Down) link fault diagnosis circuit (7
On, 7
Down) output and troubleshooting and latch memory circuit (9
On, 9
Down) input link troubleshooting and latch memory circuit (9
On, 9
Down) output signal deliver to fault display circuit (10) and heterogeneous synthetic circuit (11
Down, 11
On), heterogeneous synthetic circuit (11
Down, 11
On) output according to belonging to mutually respectively and the corresponding gate circuit (6 that belongs to upper and lower brachium pontis mutually of distributing
Down, 6
On) input link; The drive input signal (8 of upper and lower brachium pontis
On, 8
Down) deliver to gate circuit (6 respectively
On, 6
Down) input, also deliver to the fault diagnosis circuit (7 of upper and lower brachium pontis simultaneously
Down, 7
On) and the troubleshooting of upper and lower brachium pontis and latch memory circuit (9
On, 9
Down) input; Upper and lower brachium pontis gate circuit (6
On, 6
Down) output be connected to base drive circuit (13), two outputs of base drive circuit (13) respectively with main circuit in the switch element (2 of upper and lower brachium pontis (1)
On, 2
Down) base stage link; The switch element (2 of upper and lower brachium pontis
On, 2
Down) coupled in series, at each switch element (2
On, 2
Down) collection, emitter-base bandgap grading two ends and be connected to fly-wheel diode (3
On, 3
Down); The input of testing circuit (5) links with the current sensor (4) that is placed in the upper and lower brachium pontis of main circuit.
2, according to the described inverter of claim 1, it is characterized in that, in the input and the troubleshooting of the input of the output AND circuit (6) of heterogeneous synthetic circuit (11), fault diagnosis circuit (7) and latch between the input of memory circuit (9), can add input circuit (12), make the drive input signal (8) of upper and lower brachium pontis and the output signal of heterogeneous synthetic circuit (11) all send into input circuit (12) and input earlier, and the upper and lower brachium pontis output of input circuit (12) (8 '
On, 8 '
Down) difference AND circuit (6
On, 6
Down) input join, fault diagnosis circuit (7
Down, 7
On) input link, with troubleshooting and latch memory circuit (9
On, 9
Down) input link.
3, according to claim 1 or 2 described inverters, it is characterized in that, the effective isolation coupling of XOR of said base drive circuit (13), there are parts such as optocoupler drive circuit (14), light-emitting diode (15) and phototransistor (16) to form the input AND circuit (6 of optocoupler drive circuit (14)
On, 6
Down) output link, two output is connected in respectively successively on the closed-loop path that the light-emitting diode (15) of 4 photoelectrical couplers of series connection constitutes symmetrically; Each light-emitting diode (15) should have a phototransistor (16) mutually, and its light-emitting diode (15) constitutes upper and lower brachium pontis base drive output circuit in twos with phototransistor (16); Two phototransistors (16) coupled in series of same brachium pontis, interface (17 in the middle of it
On, 17
Down) respectively with connect switch element (2
On, 2
Down) preceding current amplifier links.
4, a kind of PWM inverter that prevents shoot through is characterized in that, at the upper and lower brachium pontis (1 of same phase main circuit
On, 1
Down) in a current sensor (4) and testing circuit (5) respectively are set, upper and lower brachium pontis testing circuit (5
On, 5
Down) output respectively with upper and lower brachium pontis in gate circuit (6
Down, 6
On) input and the fault diagnosis circuit (7 in the upper and lower brachium pontis
On, 7
Down) link fault diagnosis circuit (7
On, 7
Down) output link with the input that latchs memory, display circuit (18), latch the output of memory, display circuit (18) and the input of heterogeneous synthetic circuit (11) and link, the output of heterogeneous synthetic circuit (11) is according to belonging to mutually respectively and the corresponding gate circuit (6 that belongs to upper and lower brachium pontis mutually of distributing
On, 6
Down) input link; The drive input signal (8 of upper and lower brachium pontis
On, 8
Down) deliver to gate circuit (6 respectively
On, 6
Down) input, also deliver to the fault diagnosis circuit (7 of upper and lower brachium pontis simultaneously
Down, 7
On); Upper and lower brachium pontis gate circuit (6
On, 6
Down) output be connected to base drive circuit (13), two outputs of base drive circuit respectively with main circuit in the switch element (2 of upper and lower brachium pontis (1)
On, 2
Down) base stage link the switch element (2 of upper and lower brachium pontis
On, 2
Down) coupled in series, at each switch element (2
On, 2
Down) collection, emitter-base bandgap grading two ends and be connected to fly-wheel diode (3
On, 3
Down); The input of testing circuit (5) links with the current sensor (4) that is placed in the upper and lower brachium pontis of main circuit.
5, according to the said inverter of claim 4, it is characterized in that, the effective isolation coupling of XOR of said base drive circuit (13), there are parts such as optocoupler drive circuit (14), light-emitting diode (15) and phototransistor (16) to form the input AND circuit (6 of optocoupler drive circuit (14)
On, 6
Down) output link, two output is connected in respectively successively on the closed-loop path that the light-emitting diode (15) of 4 photoelectrical couplers of series connection constitutes symmetrically; Each light-emitting diode (15) should have a phototransistor (16) mutually, and its light-emitting diode (15) constitutes upper and lower brachium pontis base drive output circuit in twos with phototransistor (16); Two phototransistors (16) coupled in series of same brachium pontis, interface (17 in the middle of it
On, 17
Down) respectively with connect switch element (2
On, 2
Down) preceding current amplifier links.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92111110 CN1027522C (en) | 1992-09-22 | 1992-09-22 | Pulsewidth-modulated inverter able to prevent short circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92111110 CN1027522C (en) | 1992-09-22 | 1992-09-22 | Pulsewidth-modulated inverter able to prevent short circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1084684A CN1084684A (en) | 1994-03-30 |
| CN1027522C true CN1027522C (en) | 1995-01-25 |
Family
ID=4945148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92111110 Expired - Fee Related CN1027522C (en) | 1992-09-22 | 1992-09-22 | Pulsewidth-modulated inverter able to prevent short circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1027522C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362582B (en) * | 2014-10-31 | 2018-03-09 | 杭州华为企业通信技术有限公司 | Prevent the treating method and apparatus that circuit board burns |
| CN105337484B (en) * | 2015-11-25 | 2017-08-15 | 宁波中焱光伏科技有限公司 | A kind of upper and lower bridge arm of H bridge inverters leads directly to protection circuit |
| CN108832805B (en) * | 2018-04-24 | 2020-06-23 | 山特电子（深圳）有限公司 | Switching power supply, charging pile, inverter, frequency converter, UPS and protection circuit thereof |
| CN115206067A (en) * | 2022-07-11 | 2022-10-18 | 上海茵特格锐科技有限公司 | PWM signal alarm circuit for inverter |
-
1992
- 1992-09-22 CN CN 92111110 patent/CN1027522C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1084684A (en) | 1994-03-30 |
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| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |