CN108667318A - A kind of rectification circuit and its control method - Google Patents
A kind of rectification circuit and its control method Download PDFInfo
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- CN108667318A CN108667318A CN201810718591.4A CN201810718591A CN108667318A CN 108667318 A CN108667318 A CN 108667318A CN 201810718591 A CN201810718591 A CN 201810718591A CN 108667318 A CN108667318 A CN 108667318A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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Abstract
The present invention relates to electronic circuit field, more particularly to a kind of rectification circuit.On the basis of existing rectification circuit, increase the first switch pipe and second switch pipe using pwm signal modulation, the output of pwm signal is controlled by acquiring the Current Voltage value of inductance, so that input current follows input voltage to change, so that rectification circuit realizes boosting or reduced output voltage, a wide range of voltage value can be exported.
Description
Technical field
The present invention relates to electronic circuit field, more particularly to a kind of rectification circuit and its control method.
Background technology
Since the power supply of Utilities Electric Co. is alternating current, and existing electronic equipment needs direct current supply, so by alternating current
The rectification circuit for being converted to direct current is widely used, with rectification bridge BOOST circuits mode it is the most commonly used, technology also most at
It is ripe, but the method output voltage necessarily is greater than the maximum value of input AC electricity, cannot achieve direct current of the output less than input voltage
Voltage especially needs the occasion that low pressure exports not applicable in the occasion for needing a wide range of output voltage.
Invention content
The technical problem to be solved by the present invention is to：A kind of rectification circuit that can export wide-range voltage and its control are provided
Method processed.
In order to solve the above-mentioned technical problem, one aspect of the present invention is：
A kind of rectification circuit, including the first diode, the second diode, third diode, the 4th diode, inductance,
One switching tube, second switch pipe, third switching tube, the 4th switching tube, the first BUS capacitances and the 2nd BUS capacitances；
The positive of the anode of first diode and the second diode is electrically connected with exchanging respectively, first diode
Cathode be connected with the cathode of the second diode by inductance, first diode is connected in parallel with first switch pipe, described
Second diode is connected in parallel with second switch pipe；
One end of the inductance is connected with third switching tube and the 4th switching tube respectively, and the third switching tube passes through third
Diode is connected with the 2nd BUS capacitances, and one end of the 2nd BUS capacitances is connected with the anode of third diode, and described second
The other end of BUS capacitances is connected with one end of the first BUS capacitances, and the 4th switching tube passes through the 4th diode and the first BUS
Capacitance is connected, and the other end of the first BUS capacitances is connected with the cathode of the 4th diode；The other end of the inductance respectively with
First BUS capacitances and the 2nd BUS capacitances are connected.
Another technical solution used in the present invention is：
A kind of control method of rectification circuit, includes the following steps：
S1, the voltage value for acquiring alternating current are simultaneously labeled as the first value, compare the first value and the size of preset value, if the first value
More than the first preset value, S2 is thened follow the steps, if the first value is less than the second preset value, thens follow the steps S3；
S2, it is closed third switching tube, disconnects first switch pipe and the 4th switching tube, second switch pipe accesses PWM modulation letter
Number；
S3, it is closed the 4th switching tube, disconnects second switch pipe and third switching tube, first switch pipe accesses PWM modulation letter
Number.
The beneficial effects of the present invention are：Pwm signal is controlled by acquiring electric current and the input AC electricity value of inductance
Output so that input current follows input voltage to change so that rectification circuit realizes boosting or reduced output voltage, can export big
Range of voltages value.
Description of the drawings
Fig. 1 is the circuit diagram according to a kind of rectification circuit of the present invention；
Fig. 2 is the oscillogram according to a kind of near zero-crossing point node of rectification circuit of the present invention；
Fig. 3 is according to a kind of front and back comparison diagram of the input current correction of the alternating current of rectification circuit of the present invention；
Label declaration：
D1, the first diode；D2, the second diode；D3, third diode；D4, the 4th diode；D5, the five or two pole
Pipe；D6, the 6th diode；L, inductance；T1, first switch pipe；T2, second switch pipe；T3, third switching tube；T4, the 4th switch
Pipe；BUS+, the first BUS capacitances；BUS-, the 2nd BUS capacitances；C5, filter capacitor；The first capacitances of C1；C2, the second capacitance；C3,
Three capacitances；C4, the 4th capacitance.
Specific implementation mode
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and coordinate attached
Figure is explained.
The design of most critical of the present invention is：Using the devices such as switching tube, diode, inductance composition it is shown in FIG. 1 can be real
The rectification circuit figure of existing buck is corrected inductive current sampling on the basis of traditional PWM control programs, realizes input
The function of current following input voltage (PFC).
Please refer to Fig. 1, a technical solution provided by the invention：
A kind of rectification circuit, including the first diode, the second diode, third diode, the 4th diode, inductance,
One switching tube, second switch pipe, third switching tube, the 4th switching tube, the first BUS capacitances and the 2nd BUS capacitances；
The positive of the anode of first diode and the second diode is electrically connected with exchanging respectively, first diode
Cathode be connected with the cathode of the second diode by inductance, first diode is connected in parallel with first switch pipe, described
Second diode is connected in parallel with second switch pipe；
One end of the inductance is connected with third switching tube and the 4th switching tube respectively, and the third switching tube passes through third
Diode is connected with the 2nd BUS capacitances, and one end of the 2nd BUS capacitances is connected with the anode of third diode, and described second
The other end of BUS capacitances is connected with one end of the first BUS capacitances, and the 4th switching tube passes through the 4th diode and the first BUS
Capacitance is connected, and the other end of the first BUS capacitances is connected with the cathode of the 4th diode；The other end of the inductance respectively with
First BUS capacitances and the 2nd BUS capacitances are connected.
As can be seen from the above description, the beneficial effects of the present invention are：By the current value and input AC that acquire inductance
Voltage value controls the output of pwm signal so that input current follows input voltage to change so that rectification circuit realize boosting or
Person's reduced output voltage can export a wide range of voltage value.
Further, the rectification circuit further includes filter capacitor, and the filter capacitor is connected in parallel with alternating current.
Seen from the above description, anti-interference can be increased to alternating current filtering clutter by filter capacitor.
Further, the rectification circuit further includes the first capacitance, the second capacitance, third capacitance and the 4th capacitance, described
First capacitance, the second capacitance, third capacitance and the 4th capacitance are switched with first switch pipe, second switch pipe, third successively respectively
Pipe is connected with the 4th paralleled power switches.
Seen from the above description, the first capacitance, the second capacitance, third capacitance and the 4th capacitance can be first switch pipe,
The capacitance of second switch pipe, third switching tube and the 4th switching tube itself parasitism increases anti-interference.
Further, the rectification circuit further includes the 5th diode and the 6th diode, the 5th diode and
Six diodes are connect with third switching tube and the 4th paralleled power switches successively respectively, the cathode and the three or two of the 5th diode
The cathode of pole pipe is connected, and the anode of the 6th diode is connected with the anode of the 4th diode.
Seen from the above description, the 5th diode and the 6th diode respectively with third switching tube and the 4th switching tube simultaneously
Connection, is controlled by switching signal appropriate, achievees the purpose that control energy flow direction, specifically, when input voltage is higher than output
It when voltage, prevents input voltage from directly providing energy to output end not by inductance, when input voltage is less than output voltage, prevents
Only output voltage releases energy to input terminal.
Another technical solution provided by the invention：
A kind of control method of rectification circuit, includes the following steps：
S1, the voltage value for acquiring alternating current are simultaneously labeled as the first value, compare the first value and the size of preset value, if the first value
More than the first preset value, S2 is thened follow the steps, if the first value is less than the second preset value, thens follow the steps S3；Wherein first is default
Value meets following three condition with the second preset value：First preset value is slightly larger than zero；Second preset value is slightly less than 0；First is default
The absolute value of value and the second preset value is no more than the voltage value on the first BUS capacitances or the 2nd BUS capacitances；
S2, it is closed third switching tube, disconnects first switch pipe and the 4th switching tube, second switch pipe accesses PWM modulation letter
Number；
S3, it is closed the 4th switching tube, disconnects second switch pipe and third switching tube, first switch pipe accesses PWM modulation letter
Number.
Seen from the above description, the beneficial effects of the present invention are：When the voltage value of alternating current is timing, closure third is opened
Guan Guan disconnects first switch pipe and the 4th switching tube, and second switch pipe accesses PWM modulation signal, gives the 2nd BUS capacitor chargings,
When the voltage value of alternating current is negative, it is closed the 4th switching tube, second switch pipe is disconnected and third switching tube, first switch pipe connects
Enter PWM modulation signal, gives the first BUS capacitor chargings, the output voltage of the rectification circuit is by the 2nd BUS capacitances and the first BUS
The voltage value at capacitance both ends determines, may be implemented to export a wide range of voltage value.
Further, step S1 further includes：
If the first value of the first predetermined time acquisition is equal to the first preset value, and the of the previous moment of the first predetermined time
One value is more than the first preset value, then is closed the 4th switching tube；
If the first value of the second predetermined time acquisition is equal to the second preset value, and the of the later moment in time of the second predetermined time
One value is less than the second preset value, then disconnects third switching tube.
The above process is conversions of the step S2 to step S3.
Further, step S1 further includes：
If the first value of third predetermined time acquisition is equal to the second preset value, and the of the previous moment of third predetermined time
One value is less than the second preset value, then is closed third switching tube；
If the first value of the 4th predetermined time acquisition is equal to the first preset value, and the of the later moment in time of the 4th predetermined time
One value is more than the first preset value, then disconnects the 4th switching tube.
The above process is conversions of the step S3 to step S2.
It seen from the above description, can third switching tube for some time in third switching tube and the 4th switching tube handoff procedure
Be in common closed state with the 4th switching tube, if third switching tube and the 4th switching tube simultaneously switch off, when first switch pipe or
When second switch pipe turns off, inductive current, can defective loop component in no loop state.
Fig. 1-Fig. 3 is please referred to, the embodiment of the present invention one is：
A kind of rectification circuit, including the first diode D1, the second diode D2, third diode D3, the 4th diode D4,
5th diode D5, the 6th diode D6, inductance L, first switch pipe T1, second switch pipe T2, third switch transistor T the 3, the 4th are opened
Close pipe T4, the first capacitance C1, the second capacitance C2, third capacitance C3, the 4th capacitance C4, filter capacitor C5, the first BUS capacitances BUS+
With the 2nd BUS capacitances BUS-；
The positive of the anode of first diode and the second diode is electrically connected with exchanging respectively, first diode
Cathode be connected with the cathode of the second diode by inductance, first diode is connected in parallel with first switch pipe, described
Second diode is connected in parallel with second switch pipe；
One end of the inductance is connected with third switching tube and the 4th switching tube respectively, and the third switching tube passes through third
Diode is connected with the 2nd BUS capacitances, and one end of the 2nd BUS capacitances is connected with the anode of third diode, and described second
The other end of BUS capacitances is connected with one end of the first BUS capacitances, and the 4th switching tube passes through the 4th diode and the first BUS
Capacitance is connected, and the other end of the first BUS capacitances is connected with the cathode of the 4th diode；The other end of the inductance respectively with
First BUS capacitances and the 2nd BUS capacitances are connected；
The filter capacitor is connected in parallel with alternating current, first capacitance, the second capacitance, third capacitance and the 4th capacitance
Difference is connect with first switch pipe, second switch pipe, third switching tube and the 4th paralleled power switches successively；
5th diode and the 6th diode are connect with third switching tube and the 4th paralleled power switches successively respectively, institute
The cathode for stating the 5th diode is connected with the cathode of third diode, and the anode of the 6th diode and the 4th diode are just
Extremely it is connected.D3 and D4 connect with T3 and T4 respectively, are controlled by switching signal appropriate, achieve the purpose that control energy flow direction,
Specifically, when input voltage is higher than output voltage, prevent input voltage from directly providing energy to output end not by inductance
Amount prevents output voltage from releasing energy to input terminal when input voltage is less than output voltage.D5D6 is two colonized on T3T4
Pole pipe is not essential without practical use.Most switching devices have endophyte diode.Notice that D1D2 is that have practical use
Way, it cannot remove.
Traditional pfc circuit is to add BOOST to realize that input current follows input voltage to change by rectifier bridge, is realized simultaneously
Rectification, but it exports DC voltage and is only capable of boosting and cannot be depressured.The control sequential that the present invention passes through PWM is mating with pfc circuit
Design, current correction part are to be related to the part that PWM is calculated on the basis of traditional pfc circuit control method to optimize.
The embodiment of the present invention two is：
A kind of control method of rectification circuit, includes the following steps：
S1, the voltage value for acquiring alternating current are simultaneously labeled as the first value, compare the first value and the size of preset value, if the first value
More than the first preset value, S2 is thened follow the steps, if the first value is less than the second preset value, thens follow the steps S3；
First preset value and the second preset value meet following three condition：First preset value is slightly larger than zero；Second preset value
It is slightly less than 0；The absolute value of first preset value and the second preset value is no more than the electricity on the first BUS capacitances or the 2nd BUS capacitances
Pressure value.
S2, it is closed third switching tube, disconnects first switch pipe and the 4th switching tube, second switch pipe accesses PWM modulation letter
Number；
S3, it is closed the 4th switching tube, disconnects second switch pipe and third switching tube, first switch pipe accesses PWM modulation letter
Number.
Further, step S1 further includes：
If the first value of the first predetermined time acquisition is equal to the first preset value, and the of the previous moment of the first predetermined time
One value is more than the first preset value, then is closed the 4th switching tube；
If the first value of the second predetermined time acquisition is equal to the second preset value, and the of the later moment in time of the second predetermined time
One value is less than the second preset value, then disconnects third switching tube.
The above process is conversions of the step S2 to step S3.
Further, step S1 further includes：
If the first value of third predetermined time acquisition is equal to the second preset value, and the of the previous moment of third predetermined time
One value is less than the second preset value, then is closed third switching tube；
If the first value of the 4th predetermined time acquisition is equal to the first preset value, and the of the later moment in time of the 4th predetermined time
One value is more than the first preset value, then disconnects the 4th switching tube.
The above process is conversions of the step S3 to step S2.
It seen from the above description, can third switching tube for some time in third switching tube and the 4th switching tube handoff procedure
Be in common closed state with the 4th switching tube, if third switching tube and the 4th switching tube simultaneously switch off, when first switch pipe or
When second switch pipe turns off, inductive current, can defective loop component in no loop state.
Such as the oscillogram for the near zero-crossing point node that Fig. 2 is rectification circuit, wherein Uac is the input voltage of alternating current, IL
For the electric current of inductance, DR-T1 to DR-T4 is the drive signal of tetra- switching tubes of first switch Guan Zhi；
When the input voltage of alternating current is timing, T3 is constantly in closed state, and T1 and T4 are off, T2 work
In PWM modulation state.It is closed in t0 moment T2, the input voltage of alternating current is by the first diode and T2 of T1 parallel connections to inductance
L charges, and the electric current of inductance L rises；At the t1 moment, T2 is disconnected, and inductance L is released energy by D3 and T3 to BUS-, under the electric current of L
Drop, until T2 is re-closed, starts next switch periods.
It is that timing repeats always above-mentioned working condition in the input voltage of alternating current, according to the sample rate current and electricity of inductance
Pressure value provides the PWM of T2, and the input current for controlling alternating current follows input voltage.
To the t3 moment, the voltage of alternating current drops to the first preset value, and in embodiment, the first preset value setting value is less than single
Side BUS voltages, T4 conductings, at this time since BUS voltages are higher than input voltage, D4 is in cut-off state, therefore circuit after T4 closures
Working condition is unaffected, continues to above-mentioned working condition.
To t4 moment, the voltage zero-cross of alternating current, rectification circuit starts to be transferred to negative half period working condition：T4 is closed always,
T2 and T3 are disconnected always, and T1 controls the electric current of alternating current by PWM modulation.Working condition is identical as above-mentioned working condition.
At the t4 moment, T3 pipes are without disconnecting at once, and since near zero-crossing point, BUS voltages are higher than input voltage, D3 is cut
Only, no matter T3, which is closed or disconnects, does not influence rectification circuit working condition.To the t5 moment, the voltage of alternating current drops to second
Preset value, T3 are disconnected, and circuit is converted from positive half cycle to negative half period working condition.
Processing for the voltage over zero of alternating current, t3-t5 is the mistake that negative half period is turned to by positive half cycle in above-mentioned sequential
Journey, by negative half period become a full member half cycle sequential it is similar.
I.e. when the voltage of alternating current is declined by positive value close to zero crossing, it should open T4 first, wait for the voltage of alternating current
When turning negative value, then T3 is turned off, when the voltage of alternating current is risen by negative value close to zero crossing, it should open T3 first, wait exchanging
The voltage of electricity become a full member value when, then turn off T4.
It T3 and T4 can be closed jointly for some time in T3 and T4 handoff procedures herein, this process being closed jointly is peace
Necessary to full work, if T3 and T4 are simultaneously turned off, when T1 or T2 is turned off, the electric current of inductance can be damaged in no loop state
The component of bad circuit.
In embodiment, the input current of alternating current and the electric current of inductance simultaneously differ, in first switch pipe or second switch
During pipe is opened, inductive current and the input terminal for being not passed through alternating current, therefore the input current of alternating current is related to duty ratio
Impulse wave, only can guarantee that close to sine wave, wave is actually entered due to alternating current for inductive current by conventional control method
Shape by duty ratio due to being influenced, and average value is not accurate sine wave, thus power factor is not achieved most preferably, need to be to exchange
The electric current of electricity is corrected, bearing calibration described below：
Equation is established according to current change quantity, is had:
Ui*D/L=Uo* (1-D)/L；
Wherein:Ui is the input voltage instantaneous value of alternating current, and Uo is the output voltage instantaneous value of rectification circuit, D first
The duty ratio of switching tube or second switch pipe, L are the inductance value of inductance L.
It can be obtained after abbreviation：D=Uo/ (Uo+Ui)；
The relationship for actually entering current average and inductive current is：
Iin=D*IL=Uo*IL/ (Uo+Ui)；
Wherein Iin is the electric current of alternating current input, and IL is the electric current for flowing through inductance L.PFC target be Iin just
Than in Ui, i.e. Uo*IL/ (Uo+Ui) is directly proportional to Ui, obtain Iin and be proportional to the condition of Ui to be IL with (Uo+Ui) * Ui/Uo at just
Than, i.e. IL withIt is directly proportional.
It can be seen that the current reference value that control method through the invention obtains need to be multiplied by with correction coefficient
After use, input current can be made preferably to track input voltage, achieve the purpose that hoisting power factor.To the inductance electricity sampled
Stream increases scale factorPFC controls are participated in again afterwards, for preferably correcting input current.
Such as the input current correction that Fig. 3 is alternating current, front and back comparison diagram, Uac are the input voltage of alternating current, and IL1 is to hand over
Electric current before galvanic electricity correction, IL2 are the electric currents of alternating current after adding correction coefficient, and the sine degree of IL2 is significantly better than IL1.
In conclusion the present invention using the first diode, the second diode, third diode, the 4th diode, inductance,
First switch pipe, second switch pipe, third switching tube, the 4th switching tube, the first BUS capacitances and the 2nd BUS capacitances form Fig. 1 institutes
The rectification circuit figure for the achievable buck shown carries out school on the basis of traditional PWM control programs to the current sample of inductance
Just, while realizing that input current follows the function of input voltage (PFC), the rectification function of AC-to DC, and
Rectifier output voltage can realize boost or depressurization, export wider voltage value.
Example the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, include similarly
In the scope of patent protection of the present invention.
Claims (7)
1. a kind of rectification circuit, which is characterized in that including the first diode, the second diode, third diode, the four or two pole
Pipe, inductance, first switch pipe, second switch pipe, third switching tube, the 4th switching tube, the first BUS capacitances and the 2nd BUS capacitances；
The anode of first diode is electrically connected with exchanging respectively with the anode of the second diode, and first diode is born
Pole is connected by inductance with the cathode of the second diode, and first diode is connected in parallel with first switch pipe, and described second
Diode is connected in parallel with second switch pipe；
One end of the inductance is connected with third switching tube and the 4th switching tube respectively, and the third switching tube passes through the three or two pole
Pipe is connected with the 2nd BUS capacitances, and one end of the 2nd BUS capacitances is connected with the anode of third diode, the 2nd BUS electricity
The other end of appearance is connected with one end of the first BUS capacitances, and the 4th switching tube passes through the 4th diode and the first BUS capacitance phases
Even, the other end of the first BUS capacitances is connected with the cathode of the 4th diode；The other end of the inductance is respectively with first
BUS capacitances and the 2nd BUS capacitances are connected.
2. rectification circuit according to claim 1, which is characterized in that the rectification circuit further includes filter capacitor, the filter
Wave capacitance is connected in parallel with alternating current.
3. rectification circuit according to claim 1, which is characterized in that the rectification circuit further includes the first capacitance, the second electricity
Hold, third capacitance and the 4th capacitance, first capacitance, the second capacitance, third capacitance and the 4th capacitance are respectively successively with first
Switching tube, second switch pipe, third switching tube and the connection of the 4th paralleled power switches.
4. rectification circuit according to claim 1, which is characterized in that the rectification circuit further includes the 5th diode and the 6th
Diode, the 5th diode and the 6th diode are connect with third switching tube and the 4th paralleled power switches successively respectively, institute
The cathode for stating the 5th diode is connected with the cathode of third diode, and the anode of the 6th diode and the 4th diode are just
Extremely it is connected.
5. the control method of rectification circuit described in a kind of claim 1-4 any one, which is characterized in that include the following steps：
S1, the voltage value for acquiring alternating current are simultaneously labeled as the first value, compare the first value and the size of preset value, if the first value is more than
First preset value, thens follow the steps S2, if the first value is less than the second preset value, thens follow the steps S3；
S2, it is closed third switching tube, disconnects first switch pipe and the 4th switching tube, second switch pipe accesses PWM modulation signal；
S3, it is closed the 4th switching tube, disconnects second switch pipe and third switching tube, first switch pipe accesses PWM modulation signal.
6. the control method of rectification circuit according to claim 5, which is characterized in that step S1 further includes：
If the first value of the first predetermined time acquisition is equal to the first preset value, and the first value of the previous moment of the first predetermined time
More than the first preset value, then the 4th switching tube is closed；
If the first value of the second predetermined time acquisition is equal to the second preset value, and the first value of the later moment in time of the second predetermined time
Less than the second preset value, then third switching tube is disconnected.
7. the control method of rectification circuit according to claim 5, which is characterized in that step S1 further includes：
If the first value of third predetermined time acquisition is equal to the second preset value, and the first value of the previous moment of third predetermined time
Less than the second preset value, then third switching tube is closed；
If the first value of the 4th predetermined time acquisition is equal to the first preset value, and the first value of the later moment in time of the 4th predetermined time
More than the first preset value, then the 4th switching tube is disconnected.
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