CN103683893B - The method for protecting software of off-network inverter start short circuit - Google Patents
The method for protecting software of off-network inverter start short circuit Download PDFInfo
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- CN103683893B CN103683893B CN201410009004.6A CN201410009004A CN103683893B CN 103683893 B CN103683893 B CN 103683893B CN 201410009004 A CN201410009004 A CN 201410009004A CN 103683893 B CN103683893 B CN 103683893B
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Abstract
The invention discloses the method for protecting software of a kind of off-network inverter start short circuit, when inverter startup, use open loop control mode, utilize software to be made zero by PWM duty cycle, PWM exports enable, PWM counting value returns, given sinusoidal magnitude zero；In start-up course, software control the change of given sinusoidal magnitude, make given sinusoidal magnitude by being stepped up；According to PWM count value, software judges whether start-up course has arrived last cycle that adjusted open loop controls, when adjusted open loop controls the zero crossing to last cycle, inversion output is switched to close-loop control mode by open loop control mode by software, and voltage regulates rapidly and stable to rated value.Owing to using the method for protecting software of above-mentioned off-network inverter start short circuit, on startup or in start-up course, when short circuit occurs, it is avoided that the suddenly increase of electric current, thus avoids the phenomenon that power tube damages because crossing stream, reach to protect the purpose of power device.
Description
Technical field
The present invention relates to the short-circuit protection method of a kind of off-network inverter, the method for protecting software of a kind of off-network inverter start short circuit.
Background technology
nullState Intellectual Property Office discloses Publication No. CN1954470 on April 25th, 2007，Patent name is the patent of invention of inverter bridge short-circuit protection scheme，Inverter bridge short-circuit protection scheme has the three-phase multi-electrical level inverter bridge of three branch roads，Each branch road provides the phase in three-phase output，For driving inductive load，Described three-phase multi-electrical level inverter bridge has " L " individual bus voltage level (L >=3)，In wherein said L level two are minimum negative bus voltage and maximum positive bus voltage，Any intermediate bus voltage levels and the difference of other bus voltage level are that the difference of described maximum positive bus voltage and described minimum negative bus voltage is again divided by (L-1)，Each branch road includes two and half branch roads: the first half branch roads and the second half branch roads，Described the first half branch roads comprise (L-1) individual switch being connected in series between described maximum positive bus voltage and the output of described phase，Described the second half branch roads comprise (L-1) individual switch being connected in series between described minimum negative bus voltage and the output of described phase，Each half branch road comprises: the outermost switch of described (L-1) individual switch，It is just attached to described maximum positive bus voltage or the switch of described minimum negative bus voltage；The inner switch of described (L-1) individual switch, it is just attached to the switch of described phase output；If and L ＞ 3, then comprise (L-3) individual intermediate switch of described (L-1) individual switch, its be connected in series in described between inner switch and described outermost switch, wherein: described (L-1) the individual switch of each has mutual conductance, and it is configured to be driven by control signal, the mutual conductance having with each outermost switch is less than the mutual conductance with inner switch described in half branch road, if and L ＞ 3, each intermediate switch of half branch road has such mutual conductance: it is not more than the mutual conductance of the next inner switch exporting the series connection connected facing to described phase, and the mutual conductance of the next outer switch not less than the series connection connected facing to described minimum negative bus voltage or described maximum positive bus voltage.There is the difference of essence in technique scheme and this patent.
In the various generation modes such as photovoltaic generation, wind light mutual complementing power generation, domestic energy-storage system and communication power supply, need inverse of the DC into AC.Output overcurrent and short-circuit protection technology, through development for many years, also become better and approaching perfection day by day, especially short-circuit protection, generally use hardware lockout to drive, and software switching-off SPWM signal realizes simultaneously.This circuit be applicable to inverter working properly after short-circuit protection.But working as load short circuits, work of starting shooting in the case of user is unwitting, power device of inverter can cause overcurrent damage not in time because of protection.
Traditional short-circuit protection scheme can not thoroughly solve short circuit and cause machine breakdown problem; when short circuit is started shooting; output voltage is pulled low close to zero; in incipient several cycle, output electric current is not up to hardware trigger threshold values, under controlling loop effect; the dutycycle driving power device reaches rapidly maximum; but outside now power tube has been operated in safety zone (SOA), until hardware protection starts, power tube has damaged.
Summary of the invention
It is an object of the invention to provide the method for protecting software of a kind of off-network inverter start short circuit.The present invention, on the premise of not increasing any cost, thoroughly solves the problem that under output short-circuit state, start damages power tube by the way of software controls.
For achieving the above object, the technical solution adopted in the present invention is:
The method for protecting software of off-network inverter start short circuit, when inverter startup, uses open loop control mode, utilizes software to be made zero by PWM duty cycle, and PWM exports enable, PWM counting value returns, given sinusoidal magnitude zero；In start-up course, software control the change of given sinusoidal magnitude, make given sinusoidal magnitude by being stepped up；According to PWM count value, software judges whether start-up course has arrived last cycle that adjusted open loop controls, when adjusted open loop controls the zero crossing to last cycle, inversion output is switched to close-loop control mode by open loop control mode by software, and voltage regulates rapidly and stable to rated value.
Described given sinusoidal magnitude presses PWM count value directly proportional to be increased.
In start-up course, software segments give current protection threshold values, utilize master controller MCU to detect the output electric current of inverter in real time; output electric current is compared with given current protection threshold values; when exporting electric current more than given current protection threshold values, block drives signal, stops the startup to inverter.
When exporting electric current more than given current protection threshold values, software-driven master controller MCU send alarm signal, alarm device produce alarm.
Given current protection threshold values maximum is set as 3Irate, and wherein, Irate is inverter specified output virtual value.
Beneficial effects of the present invention: owing to using the method for protecting software of above-mentioned off-network inverter start short circuit; on startup or in start-up course; when short circuit occurs; it is avoided that the suddenly increase of electric current; thus the problem of short circuit in having the sufficient time to solve to start; thus avoid in start-up course, and the phenomenon that power tube damages because crossing stream, reach to protect the purpose of power device.
Accompanying drawing explanation
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings:
Fig. 1 is the software flow pattern of the method for protecting software of off-network inverter start short circuit；
Fig. 2 is soft start-up process output waveform figure.
Detailed description of the invention
As shown in Figure 1, 2, the method for protecting software of off-network inverter start short circuit, when inverter startup, use open loop control mode, utilize software to be made zero by PWM duty cycle, PWM exports enable, PWM counting value returns, given sinusoidal magnitude zero；In start-up course, software controlling the change of given sinusoidal magnitude, make given sinusoidal magnitude by being stepped up, and given sinusoidal magnitude press the increase of PWM count value directly proportional；According to PWM count value, software judges whether start-up course has arrived last cycle that adjusted open loop controls, when adjusted open loop controls the zero crossing to last cycle, inversion output is switched to close-loop control mode by open loop control mode by software, and voltage regulates rapidly and stable to rated value.
In start-up course; current protection threshold values is given by software segments; master controller MCU is utilized to detect the output electric current Io of inverter in real time; output electric current is compared with given current protection threshold values Ith; when exporting electric current Io more than given current protection threshold values Ith; block drives signal, stops the startup to inverter.Sent alarm signal by software-driven master controller MCU simultaneously, alarm device produce alarm.
Terminating in startup, inversion output is switched to close-loop control mode by open loop control mode by software, and voltage regulates rapidly and stable to rated value, if during output short-circuit, traditional short-circuit protection circuit the most just can be utilized to effectively protect.When short-circuit condition, given current protection threshold values Ith is: Ith >=2*Irate*1.414
=2.828Irate, Ith take 3Irate, and wherein, Irate is inverter specified output virtual value.
The above is the preferred embodiment of the present invention; certainly the interest field of the present invention can not be limited with this; should be understood that; for those skilled in the art; technical scheme is modified or equivalent, without departure from the protection domain of technical solution of the present invention.
Claims (1)
1. the method for protecting software of an off-network inverter start short circuit, it is characterised in that: when inverter startup, using open loop control mode, utilize software to be made zero by PWM duty cycle, PWM exports enable, PWM counting value returns, given sinusoidal magnitude zero；In start-up course, software control the change of given sinusoidal magnitude, make given sinusoidal magnitude be stepped up, and given sinusoidal magnitude is pressed PWM count value directly proportional and increased；According to PWM count value, software judges whether start-up course has arrived last cycle that adjusted open loop controls, when adjusted open loop controls the zero crossing to last cycle, inversion output is switched to close-loop control mode by open loop control mode by software, and voltage regulates rapidly and stable to rated value；
In start-up course; current protection threshold values is given by software segments; master controller MCU is utilized to detect the output electric current Io of inverter in real time; output electric current is compared with given current protection threshold values Ith; when exporting electric current Io more than given current protection threshold values Ith; block drives signal, stops the startup to inverter；Sent alarm signal by software-driven master controller MCU simultaneously, alarm device produce alarm；
Terminating in startup, inversion output is switched to close-loop control mode by open loop control mode by software, and voltage regulates rapidly and stable to rated value, if during output short-circuit, given current protection threshold values Ith is: Ith >=2*Irate*1.414
=2.828Irate, Ith take 3Irate, and wherein, Irate is inverter specified output virtual value.
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| CN201410009004.6A CN103683893B (en) | 2014-01-09 | 2014-01-09 | The method for protecting software of off-network inverter start short circuit |
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| CN201410009004.6A CN103683893B (en) | 2014-01-09 | 2014-01-09 | The method for protecting software of off-network inverter start short circuit |
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| CN103683893B true CN103683893B (en) | 2016-10-05 |
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| US9450492B1 (en) * | 2015-06-24 | 2016-09-20 | Infineon Technologies Ag | System and method for controlling a duty cycle of a switched-mode power supply |
| CN111200277B (en) * | 2020-02-26 | 2020-11-10 | 浙江禾川科技股份有限公司 | Servo driver and overcurrent fault protection circuit thereof |
| CN112421577B (en) * | 2020-10-28 | 2022-06-21 | 爱士惟新能源技术(江苏)有限公司 | Rapid power-off protection method for photovoltaic inverter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103066826A (en) * | 2012-12-21 | 2013-04-24 | 深圳市天微电子有限公司 | Soft-start system of switching power supply converter |
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| US6898093B2 (en) * | 2003-06-24 | 2005-05-24 | Toshiba International Corporation | Power conversion circuit with clamp and soft start |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103066826A (en) * | 2012-12-21 | 2013-04-24 | 深圳市天微电子有限公司 | Soft-start system of switching power supply converter |
Non-Patent Citations (2)
| Title |
|---|
| "基于DSP的单相逆变器并联控制技术研究";宋伟;《万方数据库》;20100919;45-51 * |
| "基于DSP的大功率三相逆变电源设计与实现";任贤等;《装备制造技术》;20120630(第6期);175-178 * |
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