CN102611348A - Pulse-width modulation (PWM) output method for solving problem of nonuniform heating of bridge arm switch of single-phase full-bridge inverter circuit - Google Patents
Pulse-width modulation (PWM) output method for solving problem of nonuniform heating of bridge arm switch of single-phase full-bridge inverter circuit Download PDFInfo
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Abstract
The invention relates to a pulse-width modulation (PWM) output method for solving the problem of nonuniform heating of a bridge arm switch of a single-phase full-bridge inverter circuit. The PWM output method is characterized in that two bridge arms use the modulation wave period T as an interval for alternately outputting PWM waves and square wave voltage. The problem of nonuniform heating caused by great work frequency differences of two bridge arm switches is solved, the temperature of an overheat switch is obviously reduced, insulated gate bipolar translator (IGBT) power switch device faults caused by overheat is effectively overcome, the reliability of a switch device is favorably improved, and the service life is prolonged.
Description
Technical field
The present invention relates to control fields such as Electric Machines and Electric Apparatus, power electronics, DSP technology, particularly a kind of uneven PWM output method of single-phase full bridge inverter circuit brachium pontis switch heating that solves.
Background technology
Single-phase DC-AC inversion adopts the single-phase full bridge circuit to realize that circuit is made up of two brachium pontis, and is as shown in Figure 1 usually.The fixing output of brachium pontis mono-polar PWM voltage (left side brachium pontis a point voltage ripple) in the inversion process, then fixing output power frequency (50/60HZ) the alternation square-wave voltage (right side brachium pontis b point voltage ripple) of another brachium pontis, voltage U between two brachium pontis a, b
AbAfter LC filtering, be pure single-phase simple alternating current output voltage U
AB, this voltage is done the cycle variation with frequency of modulated wave.
Yet PWM change in voltage frequency more than several KHZ, requires power semiconductor switch IGBT to do the switch motion of corresponding frequencies usually for this reason, and consequent switching loss and switching frequency are closely related, and the high more loss of frequency is big more.Loss raises device temperature, and is totally unfavorable to reliability and life-span.This shows that the brachium pontis switch of fixing output PWM voltage is under the operating state of high frequency break-make always in the existing inversion transformation technique, heating is serious, and rate of breakdown is high; Another brachium pontis is because of fixing output power frequency alternation square wave, and its switch is in low frequency break-make operating state, and it is lower to generate heat.Therefore, the existing inversion way of output exists the uneven drawback of two brachium pontis switches heating because of two brachium pontis operating frequencies great disparity.
Summary of the invention
The purpose of this invention is to provide and solve the uneven PWM voltage output intent of single-phase full bridge inverter circuit two brachium pontis switches heating.
The present invention adopts following technical scheme to realize: a kind of uneven PWM output method of single-phase full bridge inverter circuit brachium pontis switch heating that solves is characterized in that: let two brachium pontis serve as alternately to export PWM ripple and square-wave voltage at interval by turns with the modulating wave cycle T.
In an embodiment of the present invention, the control utmost point of two tandem tap IGBT in each brachium pontis is controlled by dsp controller through drive circuit respectively, controls described two brachium pontis output PWM ripple and square-wave voltage by DSP.
In an embodiment of the present invention, described control is to be provided with one earlier to rotate control variables, and this variable has two kinds of logical values, represents former and later two modulating wave cycles respectively, judges current which kind of modulating wave cycle that is in for system; Control the PWM output of left brachium pontis and right brachium pontis respectively through the comparand register CMPR1 among the task manager EVA of DSP, CMPR2; Concrete grammar is: a timer T1 is set is increase and decrease counting mode of operation, the period register T1PR value of this timer T1 is made as the carrier cycle time value
T C1/2nd, when the count value generation underflow of counter T1CNT or cycle during coupling, system changes over to and carries out PWM in the interrupt service subroutine and calculate in real time; In interrupt service subroutine; If current PWM calculates the last cycle that is in modulating wave; Then calculate the pairing comparison value of PWM pulsewidth of each carrier cycle in real time, and this value is deposited among the comparand register CMPR1, make left brachium pontis output PWM voltage wave according to mono-polar SPWM computational methods; Divide two stages to the assignment of another comparand register CMPR2, if current calculating is in the preceding half period of modulating wave, then assignment is the carrier cycle time value
T C1/2nd, make right brachium pontis output electronegative potential; If current calculating is in the later half cycle of modulating wave, then assignment is zero, makes right brachium pontis output high potential, so right brachium pontis output power frequency square wave; The PWM that accomplishes the last modulating wave cycle when system calculates; When changing following one-period over to, exchange to the different disposal method of comparand register CMPR1 and CMPR2 respectively above-mentioned, then two brachium pontis output waveforms also change immediately; Be left brachium pontis output power frequency square wave, right brachium pontis output PWM ripple.
The invention solves single-phase full bridge inverter circuit two brachium pontis switches and cause the uneven problem of generating heat because of the operating frequency great disparity; Let overheat awitch IGBT significantly lower the temperature; Effectively overcome the overheated switching device fault that causes, help promoting the reliability of switching device, increase the service life.
Description of drawings
Fig. 1 is a DC-AC inversion single-phase full bridge circuit diagram.
Fig. 2 is a DSP control main program flow sketch map.
Fig. 3 is that the brachium pontis cyclical method generates single-phase mono-polar SPWM interruption subroutine schematic flow sheet.
Embodiment
Present embodiment provides a kind of uneven PWM voltage output intent of single-phase full bridge inverter circuit two brachium pontis switches heatings that solves, and this method is to let two brachium pontis serve as alternately to export PWM ripple and square-wave voltage at interval by turns with the modulating wave cycle T.Be that last cycle device lets Fig. 1 left side brachium pontis export the PWM wave voltage, right side brachium pontis output square-wave voltage, following one-period will let the left side brachium pontis export square-wave voltage; Right side brachium pontis output PWM wave voltage; The way of output that replaces has so by turns not only kept output voltage waveforms constant, makes the heating of two brachium pontis switches reach balanced again; Let overheat awitch significantly lower the temperature, effectively overcome the overheated switching device failure problems that causes.
Below we are embodied as example with dsp controller control and realize that single-phase full bridge inverter circuit two brachium pontis export PWM ripple and square-wave voltage by turns.Two tandem tap IGBT control utmost points in every brachium pontis are connected to four pins of PWM1～PWM4 of DSP device respectively through drive circuit.By the left brachium pontis of the comparand register CMPR1 among the task manager EVA of DSP, CMPR2 difference control chart 1 and the PWM output of right brachium pontis.Timer T1 is set is increase and decrease counting mode of operation, its period register T1PR value is made as the carrier cycle time value
T C1/2nd, when the count value generation underflow of counter T1CNT or cycle during coupling, program changes over to carries out PWM and calculates in real time in the interrupt service subroutine.In interrupt service subroutine; If current PWM calculates the last cycle that is in modulating wave; Then calculate the pairing comparison value of PWM pulsewidth of each carrier cycle in real time according to mono-polar SPWM computational methods; And this value deposited among the comparand register CMPR1, make the left brachium pontis a point output PWM voltage wave of Fig. 1.Divide two stages to the assignment of another comparand register CMPR2.If current calculating is in the preceding half period of modulating wave, then assignment is the carrier cycle time value
T C1/2nd, making right brachium pontis b point current potential is N (electronegative potential); If current calculating is in the later half cycle of modulating wave, then assignment is zero, and making right brachium pontis b point current potential is P (high potential), so b point output power frequency square wave.The PWM that accomplishes the last modulating wave cycle when program calculates; When changing following one-period over to, exchange to the different disposal method of comparand register CMPR1 and CMPR2 respectively above-mentioned, then two brachium pontis output waveforms also change immediately; Be left brachium pontis output power frequency square wave, right brachium pontis output PWM ripple.So circulation endlessly can realize that two brachium pontis export PWM ripple and square wave automatically by turns by the modulating wave cycle.
Must be pointed out, describedly exchange processing and can carry out automatically, be necessary in program, to introduce a control variables and be referred to as control variables by turns by the modulating wave cycle for making.This variable has two kinds of logical values, continuous two modulating wave cycles before and after representing respectively, be in which kind of modulating wave cycle for procedure identification is current, and be directed against processing.Concrete main program flow sketch map sees also Fig. 2, and the interruption subroutine schematic flow sheet sees also Fig. 3.
The above is merely preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (3)
1. one kind solves the uneven PWM output method of single-phase full bridge inverter circuit brachium pontis switch heating, it is characterized in that: let two brachium pontis serve as alternately to export PWM ripple and square-wave voltage at interval by turns with the modulating wave cycle T.
2. the PWM output method that solution single-phase full bridge inverter circuit brachium pontis switch heating according to claim 1 is uneven; It is characterized in that: the control utmost point of two tandem tap IGBT in each brachium pontis is controlled by dsp controller through drive circuit respectively, controls described two brachium pontis output PWM ripple and square-wave voltage by DSP.
3. the PWM output method that solution single-phase full bridge inverter circuit brachium pontis switch heating according to claim 2 is uneven; It is characterized in that: described control is to be provided with one earlier to rotate control variables; This variable has two kinds of logical values; Represent former and later two modulating wave cycles respectively, judge current which kind of modulating wave cycle that is in for system; Control the PWM output of left brachium pontis and right brachium pontis respectively through the comparand register CMPR1 among the task manager EVA of DSP, CMPR2; Concrete grammar is: a timer T1 is set is increase and decrease counting mode of operation, the period register T1PR value of this timer T1 is made as the carrier cycle time value
T C1/2nd, when the count value generation underflow of counter T1CNT or cycle during coupling, system changes over to and carries out PWM in the interrupt service subroutine and calculate in real time; In interrupt service subroutine; If current PWM calculates the last cycle that is in modulating wave; Then calculate the pairing comparison value of PWM pulsewidth of each carrier cycle in real time, and this value is deposited among the comparand register CMPR1, make left brachium pontis output PWM voltage wave according to mono-polar SPWM computational methods; Divide two stages to the assignment of another comparand register CMPR2, if current calculating is in the preceding half period of modulating wave, then assignment is the carrier cycle time value
T C1/2nd, make right brachium pontis output electronegative potential; If current calculating is in the later half cycle of modulating wave, then assignment is zero, makes right brachium pontis output high potential, so right brachium pontis output power frequency square wave; The PWM that accomplishes the last modulating wave cycle when system calculates; When changing following one-period over to, exchange to the different disposal method of comparand register CMPR1 and CMPR2 respectively above-mentioned, then two brachium pontis output waveforms also change immediately; Be left brachium pontis output power frequency square wave, right brachium pontis output PWM ripple.
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