CN103715872A - Power supply and pulse width modulation generating method and device - Google Patents
Power supply and pulse width modulation generating method and device Download PDFInfo
- Publication number
- CN103715872A CN103715872A CN201410003334.4A CN201410003334A CN103715872A CN 103715872 A CN103715872 A CN 103715872A CN 201410003334 A CN201410003334 A CN 201410003334A CN 103715872 A CN103715872 A CN 103715872A
- Authority
- CN
- China
- Prior art keywords
- period
- generated
- duty ratio
- signal
- moment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000007704 transition Effects 0.000 claims description 39
- 238000004519 manufacturing process Methods 0.000 claims description 25
- 230000009191 jumping Effects 0.000 claims description 16
- 230000014759 maintenance of location Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 230000009466 transformation Effects 0.000 claims description 6
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 5
- 230000005284 excitation Effects 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 230000009514 concussion Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000010363 phase shift Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a power supply and a pulse width modulation generating method and device. According to the method, by means of setting the moment of a generated signal turning into high level from low level in a first period, the moment of the generated signal turning into the low level from the high level in the first period, the moment of a signal, turning into high level from low level in a second period, to be generated and the moment of the signal, turning into the low level from the high level in the second period, to be generated, the generated PMW signal in the two periods of a switch tube is made to achieve the purpose that the switch tube is powered on at least one time when the voltage passing through the two ends of the switch tube is the minimum, power-on losses of switch tubes in a flyback type conversion circuit are reduced, and the power-on efficiency of the switch tube is improved.
Description
Technical field
The present invention relates to power technology, relate in particular to method and the device of a kind of power supply, production burst bandwidth modulation signals.
Background technology
In Switching Power Supply, work in DCM(Discontinuous Current Mode, i.e. discontinous mode) flyback (FLYBACK) translation circuit under pattern, its output obtains energy when the simple winding deenergization of transformer.Break-make between the simple winding of transformer and power supply is controlled by conducting or the shutoff of switching tube.The conducting of switching tube or shutoff are by driving signal PWM to control.
While driving signal low level, switching tube turn-offs, and transformer is to load end transferring energy; While driving signal high level, switching tube conducting, the simple winding storage power of transformer.
But, while turn-offing due to switching tube, the voltage at its two ends equals supply voltage and transformer primary step voltage sum, during switching tube conducting, the voltage at its two ends is negligible, therefore when driving signal from low transition to high level, switching tube is open-minded from high voltage, causes the turn-on consumption of switching tube larger.
Summary of the invention
The object of the invention is to propose method and the device of a kind of power supply, production burst bandwidth modulation signals, to reduce the turn-on consumption of switching tube in feedback reverting circuit.
For reaching this object, the present invention by the following technical solutions:
A method for production burst bandwidth modulation signals, comprising:
According to the first preset value, the first duty ratio, the second duty ratio and harmonic period, the moment that signal to be generated is high level in the period 1 from low transition is set, according to described the first preset value, the second duty ratio and harmonic period, it is the low level moment in the described period 1 from high level saltus step that described signal to be generated is set; Wherein, according to flyback translation circuit, the output voltage at flyback translation circuit described in the upper cycle of described period 1 obtains described the first duty ratio, described the second duty ratio is the secondary current afterflow duty ratio of transformer in the described period 1 in described flyback translation circuit, described harmonic period is the harmonic period of the junction capacitance of described switching tube and the simple inductance of described transformation, and the period 1 is a switch periods of described flyback translation circuit;
According to the output voltage of described flyback translation circuit, obtain described signal to be generated at the duty ratio of second round, the next cycle that be the described period 1 described second round;
The second preset value is set to the moment that described signal to be generated is high level in described second round from low transition, so that the switching tube in described flyback translation circuit is in the situation that the both end voltage of described switching tube is minimum open-minded, according to described the second preset value and described signal to be generated, in the duty ratio of second round, described signal to be generated being set is the low level moment in described second round from high level saltus step; Described the first preset value is greater than described the second preset value, and described the first preset value and described the second preset value between difference equal two switch periods of described flyback translation circuit;
In the moment that is high level in the described period 1 from low transition according to the signal described to be generated arranging, from high level saltus step, be the low level moment, described signal to be generated in moment that is high level from low transition described second round and be the low level moment from high level saltus step, generate for controlling the switching tube conducting of described flyback translation circuit or the pulse width modulating signal of shutoff.
A device for production burst bandwidth modulation signals, comprising:
Module is set, be used for according to the first preset value, the first duty ratio, the second duty ratio and harmonic period, the moment that signal to be generated is high level in the period 1 from low transition is set, according to described the first preset value, the second duty ratio and harmonic period, it is the low level moment in the described period 1 from high level saltus step that described signal to be generated is set; Wherein, according to flyback translation circuit, the output voltage at flyback translation circuit described in the upper cycle of described period 1 obtains described the first duty ratio, described the second duty ratio is the secondary current afterflow duty ratio of transformer in the described period 1 in described flyback translation circuit, described harmonic period is the harmonic period of the junction capacitance of described switching tube and the simple inductance of described transformation, and the period 1 is a switch periods of described flyback translation circuit;
Duty ratio obtains module, for obtaining described signal to be generated according to the output voltage of described flyback translation circuit at the duty ratio of second round, the next cycle that be the described period 1 described second round;
The described module that arranges, also for the second preset value, be set to the moment that described signal to be generated is high level in described second round from low transition, so that the switching tube in described flyback translation circuit is in the situation that the both end voltage of described switching tube is minimum open-minded, according to described the second preset value and described signal to be generated, in the duty ratio of second round, described signal to be generated being set is the low level moment in described second round from high level saltus step; Described the first preset value is greater than described the second preset value, and described the first preset value and described the second preset value between difference equal two switch periods of described flyback translation circuit;
Signal generation module, for moment that is high level in the described period 1 from low transition according to the described signal described to be generated that module setting is set, be the low level moment, described signal to be generated in moment that is high level from low transition described second round and be the low level moment from high level saltus step from high level saltus step, generate for controlling the switching tube conducting of described flyback translation circuit or the pulse width modulating signal of shutoff.
A kind of power supply, the device that comprises feedback reverting circuit and above-mentioned production burst bandwidth modulation signals, the output of described device is connected with the switching tube in described flyback circuit, the pulse width modulating signal that described device generates outputs to described switching tube by described output, for conducting or the shutoff of control switch pipe.
The power supply that technique scheme provides, the method of production burst bandwidth modulation signals and device, by arranging, generate the moment that signal is high level in the described period 1 from low transition, from high level saltus step, it it is the low level moment, the moment that described signal to be generated is high level in described second round from low transition, and it is the low level moment from high level saltus step, make the pwm signal generating in the cycle, at least realize once open-minded when switching tube both end voltage is minimum at two switching tubes, reduced the turn-on consumption of switching tube in feedback reverting circuit, improved the efficiency of opening of switching tube.
Accompanying drawing explanation
The flow chart of the method for a kind of production burst bandwidth modulation signals that Fig. 1 provides for the embodiment of the present invention;
The voltage oscillogram at the switch mosfet pipe two ends of the FLYBACK translation circuit primary side under pwm signal that the method for the production burst bandwidth modulation signals that Fig. 2 provides for the embodiment of the present invention the generates a kind of DCM of working in pattern to be applied;
The former limit circuit of the applied a kind of flyback translation circuit of method of the production burst bandwidth modulation signals that Fig. 3 provides for the embodiment of the present invention can isoboles;
The oscillogram of pulse width modulating signal that the method for the production burst bandwidth modulation signals that Fig. 4 provides for the embodiment of the present invention generates and the voltage oscillogram at the switching tube two ends of control thereof;
The structural representation of the device of a kind of production burst bandwidth modulation signals that Fig. 5 provides for the embodiment of the present invention;
The device of the production burst bandwidth modulation signals that Fig. 6 provides for the embodiment of the present invention generates the realization flow figure of pwm signal;
The structural representation of a kind of power supply that Fig. 7 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and by embodiment, further illustrate technical scheme of the present invention.
In the method for the production burst bandwidth modulation signals that the embodiment of the present invention provides, the pulse width modulating signal generating is mainly used to the driving signal as switching tube in FLYBACK translation circuit, make switching tube open-minded in the situation that voltage is minimum as much as possible, to reduce switching tube, open the loss of generation.
The flow chart of the method for a kind of production burst bandwidth modulation signals that Fig. 1 provides for the embodiment of the present invention.As shown in Figure 1, the method for production burst bandwidth modulation signals comprises: step 11 is to step 15.
In step 11, according to the first preset value, the first duty ratio, the second duty ratio and harmonic period, the moment that signal to be generated is high level in the period 1 from low transition is set, according to described the first preset value, the second duty ratio and harmonic period, it is the low level moment in the described period 1 from high level saltus step that described signal to be generated is set; Wherein, described the first duty ratio obtained (explanation that obtains method and following step 12 is similar) according to flyback translation circuit at the output voltage of flyback translation circuit described in the upper cycle of described period 1, described the second duty ratio is the secondary current afterflow duty ratio of transformer in the described period 1 in described flyback translation circuit, described harmonic period is the harmonic period of the junction capacitance (being equivalent parallel electric capacity) of described switching tube and the simple inductance of described transformation, and the described period 1 is a switch periods of described flyback translation circuit.
At present, work in the FLYBACK translation circuit primary side under DCM pattern switch mosfet pipe two ends voltage waveform as shown in Figure 2.After switching tube disconnects, the voltage at switching tube two ends reaches the highest, transformer transferring energy, and after transformer secondary output electric current drops to zero, there is concussion in switching tube both end voltage.This concussion is to be produced by the junction capacitance of switching tube and transformer primary side inductance (magnetizing inductance and leakage inductance) resonance, and the voltage of junction capacitance is exactly the voltage at switching tube two ends.
When secondary transformer current does not arrive zero, the voltage at the simple coil of transformer two ends equals secondary reflection voltage Vgrid/N, so can be calculated by loop voltage, now the voltage at switching tube two ends equals Vgrid/N+Vpv, this state maintains until secondary voltage electric current arrives zero, the diode that now transformer secondary output coil connects also will end, and make the voltage vanishing on secondary coil, thus also vanishing of the voltage on original grade coil.
During the simple inductance of transformer (comprising leakage inductance) and switching tube equivalent parallel capacitor C oss form loop resonance, harmonic period
remain unchanged.Because resonant tank certainly exists resistance loss, so resonance potential amplitude is attenuation trend, and finally rest on supply voltage value.
Due in resonant process, the voltage at switching tube two ends can be reduced to lower than supply voltage value, therefore, can obtain the lower moment of voltage at switching tube two ends according to harmonic period, with this, pwm signal is set from low transition to high level, by this pwm signal, can realizes control switch pipe open-minded under lower voltage, reach the object of the turn-on consumption that reduces switching tube, realize the zero voltage switch (Zero Voltage Switch, ZVS) of switching tube.
In step 12, according to the output voltage of described flyback translation circuit, obtain described signal to be generated at the duty ratio of second round, the next cycle that be the described period 1 described second round.
The former limit circuit of flyback translation circuit can equivalence as shown in Figure 3, input side Uin is equivalent source, r is circuit internal resistance summation, comprises the winding wire internal resistance of wire internal resistance and transformer, and L
leakand L
mrespectively leakage inductance and the magnetizing inductance of transformer.Under the state of switching tube conducting, switching tube MOSFET can be equivalent to a conducting internal resistance r of a perfect switch series connection
on.
The in the situation that of switching tube conducting, by loop electric potential balancing, can be obtained:
Solve i
1(t),
By known, under DCM pattern, in switching frequency f=100kHz situation, in a switch periods, t is very little, so utilize progression local linearization (2) formula can turn to as follows:
Therefore in ideal source Uin input, conducting duty ratio, be, D and switch periods T=10
-5under s state, current peak can reach:
From high frequency transformer principle, in these cases, the energy of single switch periodic pressure oscillation device transmission is again:
Formula (4) substitution can be obtained in (5):
L in above formula
leakand L
mbe respectively leakage inductance and the magnetizing inductance of transformer, and as high-frequency transformer, magnetizing inductance parameter is the quantity of μ H level, and leakage inductance is very little with respect to magnetizing inductance, therefore, (the L in above formula
m+ L
leak) can be approximately L
mso (6) formula can be approximately:
By above formula, further calculate power:
And then obtain the expression formula of D:
Above-mentioned circuit of reversed excitation is applied in photovoltaic inverting system, requirement is simple alternating current at the grid-connected end of output, so changes at each output voltage and output current constantly, this just means, the output instantaneous power in each moment (at an electrical network in the cycle) also will change.And by known to the analysis of circuit of reversed excitation, grid-connected end and electrical network join, so that output voltage follows line voltage one and changes, so be operated in DCM or BCM pattern lower time when circuit of reversed excitation, secondary side is exported and is current source characteristic.Thus, by just controlling the current peak in the monocycle to the control of duty ratio, and then controlled the energy of inputting.
From electrical network, exchanged, in electrical network, electric current and voltage is sinusoidal, as follows:
U
grid(t)＝U
grid_peaksinωt
I(t)＝I
peaksinωt
P
o(t)＝U
grid(t)*I(t)＝U
grid_peakI
peaksin
2ωt （9）
In above formula, ω is electrical network angular frequency, ω=2 π f, and f=50Hz, will obtain in power output expression formula (9) substitution formula (8):
P in above formula
peak=U
grid_peak* I
peakfor peak power.
In addition, the volt-second characteristic principle by switch periods can obtain as follows:
U
inD
onT＝U
grid(t)D
offT （11）
Wherein, D
offfor the duty ratio of Circuit Fault on Secondary Transformer diode current flow in circuit of reversed excitation, i.e. conducting finishes the rear duty ratio (having ignored that a bit of time that secondary side current rises rapidly when switch turn-offs) that starts to be down to secondary side current that zero a period of time.
Finally by (11), can obtain D
offexpression formula as follows:
From above formula, U
grid_peakfor electrical network crest voltage (definite value), when circuit of reversed excitation is operated under constant frequency switch (being that T is constant) state, the D obtaining
offbe a constant, mean the time (D of Circuit Fault on Secondary Transformer diode current flow
offt) be constant.
Therefore, by above formula (10), can obtain the size that feedback reverting circuit drives the duty ratio D of signal, to control output instantaneous power size, realize output voltage electric current and be sinusoidal variations, and then exchange output.
It should be noted that, the prerequisite that the method for above-mentioned acquisition D realizes is that feedback reverting circuit is operated in DCM or BCM(Boundary Conduction Mode, i.e. critical conduction mode) under pattern.
Selecting while thering is the MCU of digital signal processing function or DSP control inverter system, main circuit is operated under constant frequency DCM pattern, can utilize ADC(Analog-to-Digital Converter, analog to digital converter) gather PV(photovoltaic, photovoltaic generation) voltage of input side, obtains the digital voltage signal transforming.In formula (10), analyze again known, at an electrical network in the cycle, as long as peak power Ppeak, former limit magnetizing inductance Lm and switch periods T are definite value, so according to the PV side input voltage and the current sinusoidal position angle that collect, just can calculate corresponding duty ratio D size.
In step 13, the second preset value is set to the moment that described signal to be generated is high level in described second round from low transition, according to described the second preset value and described signal to be generated, in the duty ratio of second round, described signal to be generated being set is the low level moment in described second round from high level saltus step, so that the switching tube in described flyback translation circuit is in the situation that the both end voltage of described switching tube is minimum open-minded; Described the first preset value is greater than described the second preset value, and described the first preset value and described the second preset value between difference equal two switch periods of described flyback translation circuit.
Suppose that method that the present embodiment provides is by DSP(Digital Signal Processor, be digital signal processor) realize, the first preset value can be the value in PWM0_VAL1 register, the second preset value can be the value in PWM0_INIT register, namely the initial value of PWM0 counter is the second preset value, when counting reaches the first preset value, PWM counter count down to the first preset value since the second preset value again.
By the setting of step 11, in the period 1, pwm signal can keep after jumping to low level, until the voltage at switching tube two ends reaches minimum, now, PWM counter reaches the first preset value, thereby again since the second preset value counting, due to the signal to be generated arranging, in second round, the moment from low transition to high level is the second preset value simultaneously, make the pwm signal now generating just from low transition to high level, thereby switching tube is open-minded when both end voltage is minimum, improved the efficiency of opening of switching tube, reduced the turn-on consumption of switching tube.
And, due to described the first preset value and described the second preset value between difference equal two switch periods of described flyback translation circuit, guaranteed that the pwm signal generating is constant frequency signal, avoided the increase of switching frequency of switching tube and unnecessary switching loss.
In step 14, in the moment that is high level in the described period 1 from low transition according to the signal described to be generated arranging, from high level saltus step, be the low level moment, described signal to be generated in moment that is high level from low transition described second round and be the low level moment from high level saltus step, generate for controlling the switching tube conducting of described flyback translation circuit or the pulse width modulating signal of shutoff.
Wherein, the pulse width modulating signal of period 1 can generate after above-mentioned steps 11, and the pulse width modulating signal of second round can generate after above-mentioned steps 13.
As shown in the above description, by the setting of above-mentioned steps 11 and step 13, the pwm signal of generation can guarantee at least to realize ZVS one time in adjacent two switch periods, has reduced the turn-on consumption of switching tube in feedback reverting circuit, has improved and has opened efficiency.
Exemplary, according to the first preset value, the first duty ratio, the second duty ratio and harmonic period, the moment that signal to be generated is high level in the period 1 from low transition is set, according to described the first preset value, the second duty ratio and harmonic period, it is the low level moment in the described period 1 from high level saltus step that described signal to be generated is set, and can comprise:
By n-(Ton+Toff+Tr/2) be set to the moment that signal to be generated is high level in the period 1 from low transition, by n-(Toff+Tr/2) to be set to described signal to be generated be the low level moment in the described period 1 from high level saltus step, wherein, t1 is very first time value, n is the first preset value, Ton is the retention time that described signal to be generated is high level in the described period 1, according to described the first duty ratio, obtain, Toff is that the secondary current afterflow of described feedback reverting circuit is greater than for zero time in the described period 1, secondary current afterflow duty ratio according to described feedback reverting circuit in the described period 1 obtains, Tr is harmonic period.
As shown in Figure 4, switching tube both end voltage Vds reaches minimum value during half harmonic period (being Tr/2) after resonance, equals max{ (Vpv-Vgrid/N), 0}.And by n-(Ton+Toff+Tr/2) be set to the moment that signal to be generated is high level in the period 1 from low transition, by n-(Toff+Tr/2) to be set to described signal to be generated be the low level moment in the described period 1 from high level saltus step, make the high-level retention time Ton of pwm signal constant, and, in PWM rolling counters forward to from n-(Toff+Tr/2) count down to n during this period of time in, PWM remains low level, be that the low level retention time of PWM is Toff+Tr/2, wherein, Toff is secondary current time of afterflow in FLYBACK change-over circuit, when PWM rolling counters forward arrives n-Toff, in FLYBACK change-over circuit, secondary current drops to 0, now, the loop that the simple coil of the junction capacitance of switching tube and transformer forms starts to produce resonance, when PWM rolling counters forward arrives n, just through half harmonic period, now the voltage Vds at switching tube two ends reaches minimum, it is the second preset value that while PWM counter refreshes, and this be PWM saltus step is the moment of high level, also just mean that switching tube is in Vds hour conducting.
Exemplary, according to described the second preset value and described signal to be generated, in the duty ratio of second round, described signal to be generated being set is the low level moment in described second round from high level saltus step, can comprise:
It is the low level moment in described second round from high level saltus step that m+Ton is set to described signal to be generated, wherein, m is the second preset value, and Ton is the retention time that described signal to be generated is high level in second round, and the duty ratio according to described signal to be generated in second round obtains.
By above-mentioned setting, make m to m+Ton during this period of time in, the pwm signal of generation keeps high level always, the conducting of control switch pipe.From m+Ton, pwm signal saltus step is low level, and control switch pipe turn-offs, and now, the voltage at switching tube two ends becomes and equals supply voltage and transformer primary step voltage sum, and after transformer secondary output electric current will be for 0, starts to shake.And at n-(Ton+Toff+Tr/2) constantly, pwm signal again saltus step is high level, now, possible Vds is still in concussion process, and as shown in Figure 4, Vds now locates the 3rd Semi-resonance cycle, magnitude of voltage is still lower, and now control switch pipe turn-offs and also can reduce the loss that switching tube produces.Wherein, Ton=Don * T, Toff=Doff * T, Don is the duty ratio of the pwm signal in switch periods T1, and Doff is the secondary current afterflow duty ratio in switch periods T1, and T is switch periods.
Exemplary, the method for the production burst bandwidth modulation signals that the embodiment of the present invention provides, also can comprise:
Detect output voltage and the 4th duty ratio of described flyback translation circuit, described the 4th duty ratio is the current secondary current afterflow duty ratio of transformer in described flyback translation circuit, for described signal to be generated being set at the level jumping moment of period 3, the next cycle that the described period 3 is second round;
According to the described output voltage detecting, obtain the 3rd duty ratio, described the 3rd duty ratio is for arranging described signal to be generated at the level jumping moment of period 4 and described period 3, the next cycle that the described period 4 is the described period 3.
Wherein, the method that obtains of the 3rd duty ratio can be with the specific implementation method providing in above-mentioned steps 12.Setting and the signal to be generated of the jumping moment of signal to be generated in the period 3 are similar in the method to set up of the jumping moment of above-mentioned period 1, setting and the signal to be generated of the jumping moment of signal to be generated in the period 4 are similar in the method to set up of the jumping moment of above-mentioned period 3, the like, obtain the jumping moment of signal to be generated in all cycles.
The structural representation of the device of a kind of production burst bandwidth modulation signals that Fig. 5 provides for the embodiment of the present invention.Device shown in the present embodiment, for realizing the method shown in Fig. 1, can be the processor that DSP, programming device etc. have higher interrupt handling property, comprising:
Duty ratio obtains module 52, for obtaining described signal to be generated according to the output voltage of described flyback translation circuit at the duty ratio of second round, the next cycle that be the described period 1 described second round;
The described module 51 that arranges, also for the second preset value, be set to the moment that described signal to be generated is high level in described second round from low transition, so that the switching tube in described flyback translation circuit is in the situation that the both end voltage of described switching tube is minimum open-minded, according to described the second preset value and described signal to be generated, in the duty ratio of second round, described signal to be generated being set is the low level moment in described second round from high level saltus step; Described the first preset value is greater than described the second preset value, and described the first preset value and described the second preset value between difference equal two switch periods of described flyback translation circuit;
Exemplary, the described module 51 that arranges can be specifically for:
By n-(Ton+Toff+Tr/2) be set to the moment that signal to be generated is high level in the period 1 from low transition, by n-(Toff+Tr/2) to be set to described signal to be generated be the low level moment in the described period 1 from high level saltus step, wherein, t1 is very first time value, n is the first preset value, Ton is the retention time that described signal to be generated is high level in the described period 1, according to described the first duty ratio, obtain, Toff is that the secondary current afterflow of described feedback reverting circuit is greater than for zero time in the described period 1, secondary current afterflow duty ratio according to described feedback reverting circuit in the described period 1 obtains, Tr is harmonic period.
Exemplary, the described module 51 that arranges can be specifically for:
It is the low level moment in described second round from high level saltus step that m+Ton is set to described signal to be generated, wherein, m is the second preset value, and Ton is the retention time that described signal to be generated is high level in second round, and the duty ratio according to described signal to be generated in second round obtains.
Exemplary, the device of the production burst bandwidth modulation signals that the embodiment of the present invention provides, also can comprise:
Detection module, output voltage and the 4th duty ratio for detection of described flyback translation circuit, described the 4th duty ratio is the current secondary current afterflow duty ratio of transformer in described flyback translation circuit, for described signal to be generated being set at the level jumping moment of period 3, the next cycle that the described period 3 is second round; Wherein, detection module can be analog-to-digital conversion module (ADC), can pass through the detected output voltage signal of ADC.
The described module that arranges, also for the described output voltage detecting according to described detection module, obtain the 3rd duty ratio, described the 3rd duty ratio is for arranging described signal to be generated at the level jumping moment of period 4 and described period 3, the next cycle that the described period 4 is the described period 3.
The device of the production burst bandwidth modulation signals that the present embodiment provides arranges by setting unit and generates moment that signal is high level in the described period 1 from low transition, from high level saltus step, is the low level moment, described signal to be generated in moment that is high level from low transition described second round and is the low level moment from high level saltus step, make the pwm signal generating in the cycle, at least realize ZVS one time at two switching tubes, reduce the turn-on consumption of switching tube in feedback reverting circuit, improved the efficiency of opening of switching tube.
The digital signal controller of take based on 56800E core is example, can, by the value in the PWM registers such as SMxVAL1, SMxVAL2, SMxVAL3 and SMxINIT in controller is set, the jumping moment of pwm signal be set.For example, the value in SM0_VAL1 is set to said n, and the value in SM0_VAL2 is set to said n-(Ton+Toff+Tr/2), and the value in SM0_VAL3 is set to that said n-(Toff+Tr/2), the value in SM0_INIT is set to above-mentioned m.Specific implementation as shown in Figure 6, comprises that step 61 is to step 65.
In step 61, enter the interruption entrance that PWM0 reloads.
In step 62, judge that the RF position in register SMOSTS is SMOSTS[RF] value whether equal 1.If so, expression can be reloaded, execution step 63, otherwise explanation can not load, execution step 64.
In step 63, will close interrupt flag bit zero clearing, perform step afterwards 65.
In step 64, still in interrupt status, wait for SMOSTS[RF] value equal 1.
In step 65, calculate the duty ratio of next cycle pwm signal, and to related register assignment.Wherein, the method for computed duty cycle refers to the explanation in said method embodiment.If PWM subfunction computing module is also that above-mentioned duty ratio obtains module, calculate above-mentioned Ton and Toff.
To related register assignment, as:
The count value that when [SMO_VAL1 – (Ton+Toff+Tr/2)]->SM0_VAL2//PWM0 to be generated is set is high level, PWM0 counter should reach, wherein, value in SM0_VAL2 register is the PWM0 to be generated count value SMO_VAL1 – (Ton+Toff+Tr/2) that PWM counter should reach while being high level, SM0_VAL1 represents the value in SM0_VAL1 register, value in SM0_VAL1 register is the maximum count value that PWM0 counter reaches, when PWM0 rolling counters forward value reaches the value in SM0_VAL1 register, again from initial value, start counting,
The count value that when [SMO_VAL1 – (Toff+Tr/2)]->SM0_VAL3//PWM0 to be generated is set is low level, PWM0 counter should reach, wherein, the value in SM0_VAL3 register is the PWM0 to be generated count value SMO_VAL1 – (Toff+Tr/2) that PWM counter should reach while being low level;
While entering into next interruption, the pwm signal in next cycle is arranged to jumping moment, the assignment to related register, as follows:
The count value that when SM0_INIT->SM0_VAL2//reset PWM0 to be generated is high level, PWM0 counter should reach, wherein, SM0_INIT represents the value in SM0_INIT register, value in SM0_INIT register is the counting initial value of PWM0 counter, when PWM0 rolling counters forward reaches the value in SMO_VAL1 register, the PWM0 counter again value from SM0_INIT register starts counting;
(SM0_INIT+Ton) count value that when->SM0_VAL3//reset PWM0 to be generated is high level, PWM0 counter should reach.
After aforesaid operations, as shown in Figure 4, at T1 in the cycle, switching tube is hour the most open-minded at Vds, realizes ZVS one time for the voltage signal at the pwm signal of generation and the corresponding switching tube two ends that produce under pwm signal is controlled; At T2, in the cycle, switching tube is open-minded during Vds concussion.Can find out, in adjacent two cycle T 1 and T2, under the driving of the pwm signal that switching tube generates at said apparatus, realize once soft switch, reduce the turn-on consumption of switching tube.
It should be noted that, the PWM phase shift of adjacent periods can by interrupt and PWM register be correlated with realization is set.Because the PWM phase shift in adjacent two cycles causes the value in PWM related register, change, require DSP before each PWM changes, new settings are write to related register, to realize phase shift in next cycle.And, because making DSP, this process frequently enters interruption, and therefore higher to the performance requirement of DSP handling interrupt, require DSP rapidly, reliably.
The structural representation of a kind of power supply that Fig. 7 provides for the embodiment of the present invention.Power supply shown in the present embodiment comprises flyback circuit 71 and drive unit 72, the output of drive unit 72 is connected with the switching tube of flyback circuit 71, drive unit 72 is for production burst bandwidth modulation signals, the pulse width modulating signal generating outputs to described switching tube 71 hypothesis switching tubes by described output, for conducting or the shutoff of control switch pipe 71.As, suppose that switching tube 71 is for field effect transistor, the pulse width modulating signal that drive unit 72 generates is output to the grid (G) of switching tube 71.Wherein, drive unit 72 can be the device of any production burst bandwidth modulation signals that said apparatus embodiment provides, can control the switching tube of flyback circuit 71 and realize ZVS at least one times in adjacent two switch periods, therefore, the power supply that the present embodiment provides is lower because of the loss of opening generation of switching tube, and the service efficiency of power supply is higher.
All or part of content in the technical scheme that above embodiment provides can realize by software programming, its software program is stored in the storage medium can read, storage medium such as the hard disk in computer, computer readable memory, CD or floppy disk etc.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not depart from protection scope of the present invention.Therefore, although the present invention is described in further detail by above embodiment, the present invention is not limited only to above embodiment, in the situation that not departing from the present invention's design, can also comprise more other equivalent embodiment, and scope of the present invention is determined by appended claim scope.
Claims (9)
1. a method for production burst bandwidth modulation signals, is characterized in that, comprising:
According to the first preset value, the first duty ratio, the second duty ratio and harmonic period, the moment that signal to be generated is high level in the period 1 from low transition is set, according to described the first preset value, the second duty ratio and harmonic period, it is the low level moment in the described period 1 from high level saltus step that described signal to be generated is set; Wherein, according to flyback translation circuit, the output voltage at flyback translation circuit described in the upper cycle of described period 1 obtains described the first duty ratio, described the second duty ratio is the secondary current afterflow duty ratio of transformer in the described period 1 in described flyback translation circuit, described harmonic period is the harmonic period of the junction capacitance of described switching tube and the simple inductance of described transformation, and the period 1 is a switch periods of described flyback translation circuit;
According to the output voltage of described flyback translation circuit, obtain described signal to be generated at the duty ratio of second round, the next cycle that be the described period 1 described second round;
The second preset value is set to the moment that described signal to be generated is high level in described second round from low transition, so that the switching tube in described flyback translation circuit is in the situation that the both end voltage of described switching tube is minimum open-minded, according to described the second preset value and described signal to be generated, in the duty ratio of second round, described signal to be generated being set is the low level moment in described second round from high level saltus step; Described the first preset value is greater than described the second preset value, and described the first preset value and described the second preset value between difference equal two switch periods of described flyback translation circuit;
In the moment that is high level in the described period 1 from low transition according to the signal described to be generated arranging, from high level saltus step, be the low level moment, described signal to be generated in moment that is high level from low transition described second round and be the low level moment from high level saltus step, generate for controlling the switching tube conducting of described flyback translation circuit or the pulse width modulating signal of shutoff.
2. method according to claim 1, it is characterized in that, according to the first preset value, the first duty ratio, the second duty ratio and harmonic period, the moment that signal to be generated is high level in the period 1 from low transition is set, according to described the first preset value, the second duty ratio and harmonic period, it is the low level moment in the described period 1 from high level saltus step that described signal to be generated is set, and comprising:
By n-(Ton+Toff+Tr/2) be set to the moment that signal to be generated is high level in the period 1 from low transition, by n-(Toff+Tr/2) to be set to described signal to be generated be the low level moment in the described period 1 from high level saltus step, wherein, t1 is very first time value, n is the first preset value, Ton is the retention time that described signal to be generated is high level in the described period 1, according to described the first duty ratio, obtain, Toff is that the secondary current afterflow of described feedback reverting circuit is greater than for zero time in the described period 1, secondary current afterflow duty ratio according to described feedback reverting circuit in the described period 1 obtains, Tr is harmonic period.
3. method according to claim 1, is characterized in that, according to described the second preset value and described signal to be generated, in the duty ratio of second round, described signal to be generated being set is the low level moment in described second round from high level saltus step, comprising:
It is the low level moment in described second round from high level saltus step that m+Ton is set to described signal to be generated, wherein, m is the second preset value, and Ton is the retention time that described signal to be generated is high level in second round, and the duty ratio according to described signal to be generated in second round obtains.
4. according to the method described in claim 1-3 any one, it is characterized in that, also comprise:
Detect output voltage and the 4th duty ratio of described flyback translation circuit, described the 4th duty ratio is the current secondary current afterflow duty ratio of transformer in described flyback translation circuit, for described signal to be generated being set at the level jumping moment of period 3, the next cycle that the described period 3 is second round;
According to the described output voltage detecting, obtain the 3rd duty ratio, described the 3rd duty ratio is for arranging described signal to be generated at the level jumping moment of period 4 and described period 3, the next cycle that the described period 4 is the described period 3.
5. a device for production burst bandwidth modulation signals, is characterized in that, comprising:
Module is set, be used for according to the first preset value, the first duty ratio, the second duty ratio and harmonic period, the moment that signal to be generated is high level in the period 1 from low transition is set, according to described the first preset value, the second duty ratio and harmonic period, it is the low level moment in the described period 1 from high level saltus step that described signal to be generated is set; Wherein, according to flyback translation circuit, the output voltage at flyback translation circuit described in the upper cycle of described period 1 obtains described the first duty ratio, described the second duty ratio is the secondary current afterflow duty ratio of transformer in the described period 1 in described flyback translation circuit, described harmonic period is the harmonic period of the junction capacitance of described switching tube and the simple inductance of described transformation, and the period 1 is a switch periods of described flyback translation circuit;
Duty ratio obtains module, for obtaining described signal to be generated according to the output voltage of described flyback translation circuit at the duty ratio of second round, the next cycle that be the described period 1 described second round;
The described module that arranges, also for the second preset value, be set to the moment that described signal to be generated is high level in described second round from low transition, so that the switching tube in described flyback translation circuit is in the situation that the both end voltage of described switching tube is minimum open-minded, according to described the second preset value and described signal to be generated, in the duty ratio of second round, described signal to be generated being set is the low level moment in described second round from high level saltus step; Described the first preset value is greater than described the second preset value, and described the first preset value and described the second preset value between difference equal two switch periods of described flyback translation circuit;
Signal generation module, for moment that is high level in the described period 1 from low transition according to the described signal described to be generated that module setting is set, be the low level moment, described signal to be generated in moment that is high level from low transition described second round and be the low level moment from high level saltus step from high level saltus step, generate for controlling the switching tube conducting of described flyback translation circuit or the pulse width modulating signal of shutoff.
6. device according to claim 5, is characterized in that, described arrange module specifically for:
By n-(Ton+Toff+Tr/2) be set to the moment that signal to be generated is high level in the period 1 from low transition, by n-(Toff+Tr/2) to be set to described signal to be generated be the low level moment in the described period 1 from high level saltus step, wherein, t1 is very first time value, n is the first preset value, Ton is the retention time that described signal to be generated is high level in the described period 1, according to described the first duty ratio, obtain, Toff is that the secondary current afterflow of described feedback reverting circuit is greater than for zero time in the described period 1, secondary current afterflow duty ratio according to described feedback reverting circuit in the described period 1 obtains, Tr is harmonic period.
7. device according to claim 5, is characterized in that, described arrange module specifically for:
It is the low level moment in described second round from high level saltus step that m+Ton is set to described signal to be generated, wherein, m is the second preset value, and Ton is the retention time that described signal to be generated is high level in second round, and the duty ratio according to described signal to be generated in second round obtains.
8. according to the device described in claim 5-7 any one, it is characterized in that, also comprise:
Detection module, output voltage and the 4th duty ratio for detection of described flyback translation circuit, described the 4th duty ratio is the current secondary current afterflow duty ratio of transformer in described flyback translation circuit, for described signal to be generated being set at the level jumping moment of period 3, the next cycle that the described period 3 is second round;
The described module that arranges, also for the described output voltage detecting according to described detection module, obtain the 3rd duty ratio, described the 3rd duty ratio is for arranging described signal to be generated at the level jumping moment of period 4 and described period 3, the next cycle that the described period 4 is the described period 3.
9. a power supply, it is characterized in that, the device that comprises the production burst bandwidth modulation signals described in feedback reverting circuit and the claims 5-8 any one, the output of described device is connected with the switching tube in described flyback circuit, the pulse width modulating signal that described device generates outputs to described switching tube by described output, for conducting or the shutoff of control switch pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410003334.4A CN103715872B (en) | 2014-01-03 | 2014-01-03 | Power supply and pulse width modulation generating method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410003334.4A CN103715872B (en) | 2014-01-03 | 2014-01-03 | Power supply and pulse width modulation generating method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103715872A true CN103715872A (en) | 2014-04-09 |
| CN103715872B CN103715872B (en) | 2017-01-11 |
Family
ID=50408571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410003334.4A Expired - Fee Related CN103715872B (en) | 2014-01-03 | 2014-01-03 | Power supply and pulse width modulation generating method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103715872B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099254A (en) * | 2015-06-24 | 2015-11-25 | 中国科学院微电子研究所 | Control method of direct current-alternating current inverter |
| CN111342562A (en) * | 2020-03-17 | 2020-06-26 | 江苏方天电力技术有限公司 | SPWM wave generation method injected with LCC-S topological structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1380736A (en) * | 2001-04-12 | 2002-11-20 | 天网电子股份有限公司 | Non-ringing zero-potential switching method for power converter and its converter |
| US20100289474A1 (en) * | 2009-05-13 | 2010-11-18 | Ching-Chuan Kuo | Controllers for controlling power converters |
| CN102193577A (en) * | 2010-03-05 | 2011-09-21 | 天网电子股份有限公司 | Constant-current circuit with characteristics of voltage compensation and zero potential switching |
| CN103424602A (en) * | 2013-09-02 | 2013-12-04 | 南京埃科孚电子科技有限公司 | Secondary winding current detection circuit based on source electrode drive |
-
2014
- 2014-01-03 CN CN201410003334.4A patent/CN103715872B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1380736A (en) * | 2001-04-12 | 2002-11-20 | 天网电子股份有限公司 | Non-ringing zero-potential switching method for power converter and its converter |
| US20100289474A1 (en) * | 2009-05-13 | 2010-11-18 | Ching-Chuan Kuo | Controllers for controlling power converters |
| CN102193577A (en) * | 2010-03-05 | 2011-09-21 | 天网电子股份有限公司 | Constant-current circuit with characteristics of voltage compensation and zero potential switching |
| CN103424602A (en) * | 2013-09-02 | 2013-12-04 | 南京埃科孚电子科技有限公司 | Secondary winding current detection circuit based on source electrode drive |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099254A (en) * | 2015-06-24 | 2015-11-25 | 中国科学院微电子研究所 | Control method of direct current-alternating current inverter |
| CN111342562A (en) * | 2020-03-17 | 2020-06-26 | 江苏方天电力技术有限公司 | SPWM wave generation method injected with LCC-S topological structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103715872B (en) | 2017-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9899909B2 (en) | Control device and method of totem-pole bridgeless PFC soft switch | |
| CN102723856B (en) | Synchronous rectifier control circuit and switch power supply employing same | |
| JP2011526478A (en) | Resonant power converter | |
| US20170045555A1 (en) | Method and Device for Detecting Current of Inductor of PFC Circuit | |
| Gu et al. | Research on photovoltaic grid-connected inverter based on soft-switching interleaved flyback converter | |
| CN104065275A (en) | Quasi-resonance control circuit and method for zero-voltage switching and flyback converter | |
| CN103813591B (en) | The CRM Flyback LED driver of low output current peak-to-average force ratio | |
| CN103326581A (en) | LLC resonant converter, control circuit and driving method | |
| Jing et al. | Performance analysis of isolated three-level half-bridge bidirectional DC/DC converter | |
| CN101902129A (en) | Current-type multi-resonance direct current (DC) converter | |
| CN102790542A (en) | Synchronous rectification control circuit, converter and synchronous rectification control method | |
| CN103944402A (en) | Control method of excited push-pull converter with zero-voltage switching and excited push-pull converter | |
| US20220385193A1 (en) | Hybrid modulation controlled dc-to-ac converters | |
| CN103904901A (en) | Phase-shift full-bridge converter circuit and control method | |
| CN105517650A (en) | Fly-back dc/ac conversion circuit with plurality of windings | |
| Pragallapati et al. | Parallel-input series-output interleaved flyback based solar PV module integrated micro-inverter | |
| Kan et al. | Flexible topology converter used in photovoltaic micro‐inverter for higher weighted‐efficiency | |
| CN104167948A (en) | Variable-frequency soft switching control method of micro photovoltaic grid-connected inverter | |
| CN102122891A (en) | Absorption feedback circuit for transformer leakage inductance energy | |
| Hasan et al. | Soft-switching active-clamp flyback microinverter for PV applications | |
| TWI650925B (en) | Switching power supply, control device and control method | |
| CN103715872A (en) | Power supply and pulse width modulation generating method and device | |
| Khalilian et al. | New single-stage soft-switching flyback inverter for AC module application with simple circuit | |
| CN102801324A (en) | Secondary side active absorption line and control method for direct-current-direct-current converter | |
| Jing et al. | Analysis of Isolated Three-level Half-bridge Bidirectional DC/DC Converter based on series resonant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170111 |