CN105305803A - BOOST PFC convertor starting output voltage anti-overshoot digital control method - Google Patents
BOOST PFC convertor starting output voltage anti-overshoot digital control method Download PDFInfo
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- CN105305803A CN105305803A CN201510705754.1A CN201510705754A CN105305803A CN 105305803 A CN105305803 A CN 105305803A CN 201510705754 A CN201510705754 A CN 201510705754A CN 105305803 A CN105305803 A CN 105305803A
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Abstract
The present invention discloses a BOOST PFC convertor starting output voltage anti-overshoot digital control method. Control signals and reference voltage signals of PWM are changed through a DSP controller and a program, and the control of the algorithm is realized in the response interruption mode. At the moment of starting a PFC circuit, main power switch tube PWM signals are turned off so that the switch tube is located at the turn-off phase; and when the output direct voltage is equal to or close to a rectified output voltage, the reference value of the output voltage is equal to the rectified voltage, and the PWM signals are turned on. The reference voltage is changed to gradually increase to a setting value of the output voltage so that a soft-start function is completed. Without adding any hardware circuit elements, the starting output voltage overshoot of a BOOST PFC convertor may be avoided in a simple and effective digital control mode.
Description
Technical field
The present invention relates to the digital control technology field that anti-overshoot starts, refer in particular to a kind of digital control method realizing starting the anti-overshoot of output voltage for BOOSTPFC converter.
Background technology
Active power factor corrects (APFC, ActivePowerFactorCorrection) technology is widely used in field of switch power, wherein BOOSTPFC circuit is mainly used in high-power applications occasion, and its conventional input voltage range is 90V-264VAC.In order to enable BOOST converter steady operation, make output voltage stabilization, then need to carry out loop control to output voltage.Generally, because voltage loop bandwidth is not high, slower to the response of input voltage change, so BOOSTPFC circuit is in start-up course, particularly easily produce the phenomenon of output voltage overshoot in high input voltage start-up course, easily cause the damage of the components and parts such as switching tube, diode, electric capacity, reduce the reliability of Switching Power Supply.
Under normal circumstances, the analogue enlargement chip of BOOSTPFC has soft start function to prevent the startup overshoot of output voltage.But when PI voltage ensures loop stability, still easily produce and export startup overshoot.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, in conjunction with feature and the digital control advantage of BOOSTPFC circuit, provide the anti-overshoot digital control method of startup output voltage towards BOOSTPFC converter.
For achieving the above object, technical scheme provided by the present invention is: BOOSTPFC converter starts the anti-overshoot digital control method of output voltage, adopt dsp controller, control signal and the reference voltage signal of PWM is changed by program, and realize control algolithm in the mode of interrupt response, and periodically enter interrupt response; It comprises the following steps:
1) by the direct voltage V of BOOSTPFC converter output
busafter the output voltage detection module that gain is 1/K3, then be input to digital signal processor by the first analog-to-digital conversion interface ADC1, carry out the amplification process that gain is K4, obtain exporting sampled voltage V
o;
2) by the AC input lines voltage V of BOOSTPFC converter
in_Land V
in_Nafter the input voltage measurement module that gain is 1/K1, digital signal processor is input to again respectively by the second analog-to-digital conversion interface ADC2 and the 3rd A/D interface ADC3, carry out the amplification process that gain is K2, then obtain input peak value sampling voltage V by the detection of digital signal processor inside and rectification module
in;
3) by the input current I of BOOSTPFC converter
safter current detection module, then be input to digital signal processor by the 4th mode convertion number interface ADC4 and obtain input sample current signal I
l;
4) with reference to voltage V
refwith step 1) described in output sampled voltage V
osubtract each other, obtain difference V
e, then by the adjusted voltage V of PI Voltage loop control algolithm
m;
5) by step 2) described in input sample voltage V
in, step 3) described in input sample current signal I
l, step 4) described in regulation voltage signal V
m, by current loop backoff algorithm, then by PWM module, after drive amplification, obtain pwm signal, thus driving switch pipe Q1.
The gain 1/K1 of described input voltage measurement module, the gain 1/K3 of described output voltage detection module, described gain K2, described gain K4, the pass between four is K2/K1=K4/K3.
As described input sample voltage V
indeduct described output sampled voltage V
oabsolute value be greater than fixed voltage V
rtime, described pwm signal is low level, and described switching tube Q1 turns off, and the state variable of definition converter is S, and the state of now converter is defined as STATE1, i.e. S=STATE1.
When pwm signal is low level, the described output sampled voltage V when not having metrical error
owith described input sample voltage V
infinal meeting is equal, V
rfor V
oand V
inthe worst error estimated.
When described output sampled voltage V being detected
odeduct described input sample voltage V
inabsolute value start to be less than described fixed voltage V
rtime, described reference voltage V
refequal described input sample voltage V
in; And transducer status is afterwards defined as STATE2, i.e. S=STATE2, and after entering STATE2, V
refa fixed voltage value V on the basis of initial value
ramp, i.e. V
ref=V
ref+ V
ramp; Described reference voltage V
refwith described output sampled voltage V
odiffer from, obtain error voltage V
e, error voltage V
eobtain driving PWM to control output voltage by PI Voltage loop control algolithm and current loop control algorithm.
After entering STATE2, program performed in interrupt response from STATE2, and no longer performs the program in STATE1.
Described fixed voltage value V
rampsize according to described output voltage set point V
outsize select, excessively easily cause overshoot, too small start-up time can be long.
When described reference voltage V being detected
refbe more than or equal to described output voltage set point V
outtime, make described reference voltage V
refequal described output voltage set point V
out, obtain error voltage V
e, error voltage V
eobtain driving PWM to control output voltage by PI Voltage loop control algolithm and current loop control algorithm.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, control method of the present invention adopts dsp controller to realize, and principle is simple and practical, and programming is convenient.Described fixed voltage V can be changed
rwith fixed voltage value V
rampvalue meet requirement to different input voltage range and start-up time, and need the parameter of change to be software parameter, change is convenient.
2, control method of the present invention does not increase any extra circuit components, both saves space, whether increases extra cost, and general DSP all can realize this function.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of BOOSTPFC converter.
Fig. 2 is the system theory of constitution figure of BOOSTPFC.
Fig. 3 is the program flow diagram of digital control approach of the present invention.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Along with digital control theory with implement means constantly perfect, and there is Highgrade integration control circuit, accurate control precision, and perfect ability to communicate and power supply integrated management function, nowadays become important application means of power electronics.
As shown in Figure 1 to Figure 3, V
in_Land V
in_Nfor the line voltage of input ac voltage, V
busfor output dc voltage, L1 is BOOSTPFC inductance, and D1 is BOOST circuit diode, and D3 is that anti-inductance starts saturated diode, and D4, D5, D6, D7 are rectifier diode, and Q1 is power switch pipe, C
ofor output filter capacitor, R
ofor output loading, R
sfor inductive current sampling resistor, V
refreference voltage, V
ofor exporting sampled voltage, I
lfor inductance sampled value, V
ininput peak value sampling voltage, V
efor error voltage, V
mfor the output voltage of PI controller, PWM is respectively the driving of power switch pipe.
The anti-overshoot digital control method of startup output voltage of the BOOSTPFC converter described in the present embodiment, adopt dsp controller, changed control signal and the reference voltage signal of PWM by program, and realize control algolithm in the mode of interrupt response, and periodically enter interrupt response; It comprises the following steps:
1) by the direct voltage V of BOOSTPFC converter output
busafter the output voltage detection module that gain is 1/K3, be input to digital signal processor by the first analog-to-digital conversion interface ADC1 again, carry out the amplification process that gain is K4, obtain exporting sampled voltage V
o;
2) by the AC input lines voltage V of BOOSTPFC converter
in_Land V
in_Nafter the input voltage measurement module that gain is 1/K1, digital signal processor is input to again respectively by the second analog-to-digital conversion interface ADC2 and the 3rd A/D interface ADC3, carry out the amplification process that gain is K2, then obtain input peak value sampling voltage V by the detection of digital signal processor inside and rectification module
in;
3) by the input current I of BOOSTPFC converter
safter current detection module, then be input to digital signal processor by the 4th mode convertion number interface ADC4 and obtain input sample current signal I
l;
4) with reference to voltage V
refwith step 1) described in output sampled voltage V
osubtract each other, obtain difference V
e, then by the adjusted voltage V of PI Voltage loop control algolithm
m;
5) by step 2) described in input sample voltage V
in, step 3) described in input sample current signal I
l, step 4) described in regulation voltage signal V
m, by current loop backoff algorithm, then by PWM module, after drive amplification, obtain pwm signal, thus driving switch pipe Q1.
In order to carry out identical amplification process to input voltage and output voltage, the gain 1/K1 of described input voltage measurement module, the gain 1/K3 of described output voltage detection module, described gain K2, described gain K4, the pass between four is K2/K1=K4/K3.
As described input sample voltage V
indeduct described output sampled voltage V
oabsolute value be greater than fixed voltage V
rtime, described pwm signal is low level, and described switching tube Q1 turns off, and the state variable of definition converter is S, and the state of now converter is defined as STATE1, i.e. S=STATE1.
When pwm signal is low level, the described output sampled voltage V when not having metrical error
owith described input sample voltage V
infinal meeting is equal, i.e. described output dc voltage V
busequal the input voltage after rectification; But owing to detecting and the existence of sampling error, described output sampled voltage V
owith described input sample voltage V
inlikely unequal.So work as | V
o-V
in| enough hour, namely as described output sampled voltage V
odeduct described input sample voltage V
inabsolute value be less than described fixed voltage V
rtime, we just can assert described output dc voltage V
busrise to the input voltage after rectification.V
rfor V
oand V
inthe worst error estimated.
When described output sampled voltage V being detected
odeduct described input sample voltage V
inabsolute value start to be less than described fixed voltage V
rtime, described reference voltage V
refequal described input sample voltage V
in; And transducer status is afterwards defined as STATE2, i.e. S=STATE2, and after entering STATE2, V
refa fixed voltage value V on the basis of initial value
ramp, i.e. V
ref=V
ref+ V
ramp; Described reference voltage V
refwith described output sampled voltage V
odiffer from, obtain error voltage V
e, error voltage V
eobtain driving PWM to control output voltage by PI Voltage loop control algolithm and current loop control algorithm.
After entering STATE2, program performed in interrupt response from STATE2, and no longer performs the program in STATE1.
Described fixed voltage value V
rampsize according to described output voltage set point V
outsize select, excessively easily cause overshoot, too small start-up time can be long.
When described reference voltage V being detected
refbe more than or equal to described output voltage set point V
outtime, make described reference voltage V
refequal described output voltage set point V
out, obtain error voltage V
e, error voltage V
eobtain driving PWM to control output voltage by PI Voltage loop control algolithm and current loop control algorithm, finally obtain described output voltage V
bus.
The examples of implementation of the above are only the preferred embodiment of the present invention, not limit practical range of the present invention with this, therefore the change that all shapes according to the present invention, principle are done, all should be encompassed in protection scope of the present invention.
Claims (8)
1.BOOSTPFC converter starts the anti-overshoot digital control method of output voltage, it is characterized in that: adopt dsp controller, changed control signal and the reference voltage signal of PWM by program, and realize control algolithm in the mode of interrupt response, and periodically enter interrupt response; It comprises the following steps:
1) by the direct voltage V of BOOSTPFC converter output
busafter the output voltage detection module that gain is 1/K3, then be input to digital signal processor by the first analog-to-digital conversion interface ADC1, carry out the amplification process that gain is K4, obtain exporting sampled voltage V
o;
2) by the AC input lines voltage V of BOOSTPFC converter
in_Land V
in_Nafter the input voltage measurement module that gain is 1/K1, digital signal processor is input to again respectively by the second analog-to-digital conversion interface ADC2 and the 3rd A/D interface ADC3, carry out the amplification process that gain is K2, then obtain input peak value sampling voltage V by the detection of digital signal processor inside and rectification module
in;
3) by the input current I of BOOSTPFC converter
safter current detection module, then be input to digital signal processor by the 4th mode convertion number interface ADC4 and obtain input sample current signal I
l;
4) with reference to voltage V
refwith step 1) described in output sampled voltage V
osubtract each other, obtain difference V
e, then by the adjusted voltage V of PI Voltage loop control algolithm
m;
5) by step 2) described in input sample voltage V
in, step 3) described in input sample current signal I
l, step 4) described in regulation voltage signal V
m, by current loop backoff algorithm, then by PWM module, after drive amplification, obtain pwm signal, thus driving switch pipe Q1.
2. BOOSTPFC converter according to claim 1 starts the anti-overshoot digital control method of output voltage, it is characterized in that: the gain 1/K1 of described input voltage measurement module, the gain 1/K3 of described output voltage detection module, described gain K2, described gain K4, the pass between four is K2/K1=K4/K3.
3. BOOSTPFC converter according to claim 1 starts the anti-overshoot digital control method of output voltage, it is characterized in that: as described input sample voltage V
indeduct described output sampled voltage V
oabsolute value be greater than fixed voltage V
rtime, make described pwm signal be low level, described switching tube Q1 turns off, and the state variable of definition converter is S, and the state of now converter is defined as STATE1, i.e. S=STATE1.
4. BOOSTPFC converter according to claim 3 starts the anti-overshoot digital control method of output voltage, it is characterized in that: when pwm signal is low level, the described output sampled voltage V when not having metrical error
owith described input sample voltage V
infinal meeting is equal, i.e. V
o-V
in=0; Described fixed voltage V
rfor V
oand V
inthe worst error estimated of the absolute value of difference.
5. BOOSTPFC converter according to claim 1 starts the anti-overshoot digital control method of output voltage, it is characterized in that: when described output sampled voltage V being detected
odeduct described input sample voltage V
inabsolute value start to be less than described fixed voltage V
rtime, described reference voltage V
refequal described input sample voltage V
in; And transducer status is afterwards defined as STATE2, i.e. S=STATE2, and after entering STATE2, V
refa fixed voltage value V on the basis of initial value
ramp, i.e. V
ref=V
ref+ V
ramp; Described reference voltage V
refwith described output sampled voltage V
odiffer from, obtain error voltage V
e, error voltage V
eobtain driving PWM to control output voltage by PI Voltage loop control algolithm and current loop control algorithm.
6. BOOSTPFC converter according to claim 5 starts the anti-overshoot digital control method of output voltage, it is characterized in that: after entering STATE2, and program performed in interrupt response from STATE2, and no longer performs the program in STATE1.
7. BOOSTPFC converter according to claim 5 starts the anti-overshoot digital control method of output voltage, it is characterized in that: described fixed voltage value V
rampsize according to described output voltage set point V
outsize select, excessively easily cause overshoot, too small start-up time can be long.
8. BOOSTPFC converter according to claim 5 starts the anti-overshoot digital control method of output voltage, it is characterized in that: when described reference voltage V being detected
refbe more than or equal to described output voltage set point V
outtime, make described reference voltage V
refequal described output voltage set point V
out, obtain error voltage V
e, error voltage V
eobtain driving PWM to control output voltage by PI Voltage loop control algolithm and current loop control algorithm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510705754.1A CN105305803A (en) | 2015-10-26 | 2015-10-26 | BOOST PFC convertor starting output voltage anti-overshoot digital control method |
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|---|---|---|---|
| CN201510705754.1A CN105305803A (en) | 2015-10-26 | 2015-10-26 | BOOST PFC convertor starting output voltage anti-overshoot digital control method |
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|---|---|
| CN105305803A true CN105305803A (en) | 2016-02-03 |
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|---|---|---|---|
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602861A (en) * | 2016-12-19 | 2017-04-26 | 深圳市华星光电技术有限公司 | Control circuit improving power factor correction conversion efficiency |
| CN108023471A (en) * | 2016-10-28 | 2018-05-11 | 上海儒竞自动控制系统有限公司 | A kind of soft upper electric system, equipment and its soft powering method |
| CN108809126A (en) * | 2018-06-26 | 2018-11-13 | 上海电机学院 | A kind of wind turbine AC-DC control methods monitored in real time based on peak valley electric current |
| CN110994991A (en) * | 2019-12-17 | 2020-04-10 | 华南理工大学 | Loop-free digital control method for isolated Buck-Boost circuit |
| CN111697815A (en) * | 2020-05-26 | 2020-09-22 | 北京国铁路阳技术有限公司 | Circuit and method for prolonging service life of electrolytic capacitor in high-power PFC circuit |
| CN113612378A (en) * | 2021-07-26 | 2021-11-05 | 海信（山东）空调有限公司 | Method and device for controlling PFC circuit of variable frequency air conditioner, air conditioner and storage medium |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023471A (en) * | 2016-10-28 | 2018-05-11 | 上海儒竞自动控制系统有限公司 | A kind of soft upper electric system, equipment and its soft powering method |
| CN108023471B (en) * | 2016-10-28 | 2020-08-07 | 上海儒竞自动控制系统有限公司 | Soft power-on system, equipment and soft power-on method thereof |
| CN106602861A (en) * | 2016-12-19 | 2017-04-26 | 深圳市华星光电技术有限公司 | Control circuit improving power factor correction conversion efficiency |
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| CN108809126A (en) * | 2018-06-26 | 2018-11-13 | 上海电机学院 | A kind of wind turbine AC-DC control methods monitored in real time based on peak valley electric current |
| CN108809126B (en) * | 2018-06-26 | 2020-06-16 | 上海电机学院 | Wind turbine AC-DC control method based on peak-to-valley current real-time monitoring |
| CN110994991A (en) * | 2019-12-17 | 2020-04-10 | 华南理工大学 | Loop-free digital control method for isolated Buck-Boost circuit |
| CN110994991B (en) * | 2019-12-17 | 2021-05-14 | 华南理工大学 | Loop-free digital control method for isolated Buck-Boost circuit |
| CN111697815A (en) * | 2020-05-26 | 2020-09-22 | 北京国铁路阳技术有限公司 | Circuit and method for prolonging service life of electrolytic capacitor in high-power PFC circuit |
| CN113612378A (en) * | 2021-07-26 | 2021-11-05 | 海信（山东）空调有限公司 | Method and device for controlling PFC circuit of variable frequency air conditioner, air conditioner and storage medium |
| WO2023005594A1 (en) * | 2021-07-26 | 2023-02-02 | 海信空调有限公司 | Air conditioner, and method for controlling pfc circuit of air conditioner |
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Application publication date: 20160203 |