WO2018232818A1 - Procédé et dispositif permettant d'obtenir une valeur efficace d'une tension alternative d'une alimentation électrique pfc - Google Patents

Procédé et dispositif permettant d'obtenir une valeur efficace d'une tension alternative d'une alimentation électrique pfc Download PDF

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Publication number
WO2018232818A1
WO2018232818A1 PCT/CN2017/094173 CN2017094173W WO2018232818A1 WO 2018232818 A1 WO2018232818 A1 WO 2018232818A1 CN 2017094173 W CN2017094173 W CN 2017094173W WO 2018232818 A1 WO2018232818 A1 WO 2018232818A1
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Prior art keywords
current
voltage
value
pfc
power supply
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PCT/CN2017/094173
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English (en)
Chinese (zh)
Inventor
黄招彬
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广东美的制冷设备有限公司
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Publication of WO2018232818A1 publication Critical patent/WO2018232818A1/fr

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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the present invention relates to the field of power electronics, and in particular, to a method and an apparatus for acquiring an ac voltage of an AC voltage of a PFC power source.
  • the power factor correction circuit In household appliances and other similar systems: single-phase AC power from the grid, first through uncontrollable full-bridge rectification, then through the power factor correction circuit, and finally output DC power to power large-capacity electrolytic capacitors and loads.
  • the power factor correction circuit generally adopts the BOOST architecture.
  • the BOOST type power factor correction circuit not only enables the power supply circuit to achieve a higher power factor, but also boosts the output of a stable DC bus voltage to provide a stable DC power supply for the load.
  • BOOST type power factor correction there are various control methods for BOOST type power factor correction, such as voltage/current double closed loop control algorithm, single period control algorithm, and so on. From the perspective of power factor correction, the single-cycle control algorithm can eliminate the need for AC voltage as an input and cancel the AC voltage sampling circuit. However, in most electrical systems, AC voltage is required as a protection threshold or other control input parameters. The AC voltage RMS estimation is performed on the basis of canceling the AC voltage sampling circuit.
  • the prior art adopts the following method to obtain the effective value of the AC voltage of the PFC power source: when the current is small, the estimated voltage peak value is used to calculate the effective value, and when the current is large, the estimated voltage instantaneous value is used to calculate the effective value.
  • the instantaneous value of the voltage is related to the amount of change in the inductor current, the rise time of the inductor current, and the fall time of the inductor current.
  • the main object of the present invention is to provide an AC voltage RMS acquisition method for a PFC power supply, which aims to improve the accuracy of the AC voltage RMS acquisition result of the PFC power supply.
  • the AC voltage RMS acquisition method of the PFC power supply includes the following steps:
  • the obtaining the voltage across the electrolytic capacitor of the PFC power supply, and then obtaining the peak value of the input AC voltage of the PFC power supply according to the voltage across the electrolytic capacitor comprises:
  • S210 Collect a voltage across the electrolytic capacitor in a voltage cycle of the input AC power of the PFC power source, and store the voltage as a plurality of voltage sampling samples;
  • the power factor correction circuit is a BOOST architecture
  • the first preset calculation formula is:
  • Vac_peak is the input AC voltage peak of the PFC power supply
  • Vdc_peak is the maximum value of the voltage applied across the electrolytic capacitor
  • Vfrd is the conduction voltage drop of the fast recovery diode in the power factor correction circuit
  • Vbd is the PFC power supply. The conduction voltage drop of the rectifier bridge.
  • the power factor correction circuit includes a power switch tube and an inductor, and the determining the working mode of the power factor correction circuit specifically includes:
  • the power factor correction circuit further includes a fast recovery diode, and the second preset calculation formula is:
  • Ipeak (Vdc + Vfrd - Vigbt) / L ⁇ D(1-D) ⁇ Ts;
  • Ipeak is the current peak current of the inductor
  • Vdc is the voltage across the electrolytic capacitor
  • Vfrd For the turn-on voltage drop of the fast recovery diode
  • Vigbt is the turn-on voltage drop of the power switch tube
  • L is the inductance value of the inductor
  • D is the duty cycle of the power switch tube on-time
  • Ts The switching period of the power switch tube.
  • the obtaining the instantaneous value of the input AC voltage of the PFC power supply according to the working mode of the power factor correction circuit specifically includes:
  • the PFC power supply further includes a rectifier bridge
  • the power factor correction circuit further includes a fast recovery diode
  • the third preset calculation formula is:
  • Vac is the instantaneous value of the input AC voltage of the PFC power supply
  • Vdc is the voltage across the electrolytic capacitor
  • D is the duty ratio of the on-time of the power switch
  • Vigbt is the conduction voltage drop of the power switch.
  • Vfrd is the conduction voltage drop of the fast recovery diode
  • Vbd is the conduction voltage drop of the rectifier bridge
  • L is the inductance value of the inductor
  • ⁇ Iin is the inductance of the inductor in a switching cycle of the power switch tube
  • Ts is the switching period of the power switch tube.
  • the PFC power supply further includes a rectifier bridge, and the fourth preset calculation formula is:
  • Vac is the instantaneous value of the input AC voltage of the PFC power supply
  • L is the inductance value of the inductor
  • Ipeak is the current peak value of the inductor
  • Ton is the opening time of the power switch tube in one switching cycle
  • Vigb is the The conduction voltage drop of the power switch tube
  • Vbd is the conduction voltage drop of the rectifier bridge.
  • the power factor correction circuit includes a power switch tube and an inductor, and the determining the working mode of the power factor correction circuit specifically includes:
  • the power factor correction circuit further includes a fast recovery diode, and the fifth preset calculation formula is:
  • Imid (Vdc + Vfrd - Vigbt) / L ⁇ D (1-D) ⁇ Ts/2;
  • Imid is the current current midpoint value of the inductor
  • Vdc is the voltage across the electrolytic capacitor
  • Vfrd For the turn-on voltage drop of the fast recovery diode
  • Vigbt is the turn-on voltage drop of the power switch tube
  • L is the inductance value of the inductor
  • D is the duty cycle of the power switch tube on-time
  • Ts The switching period of the power switch tube.
  • the obtaining the instantaneous value of the input AC voltage of the PFC power supply according to the working mode of the power factor correction circuit specifically includes:
  • the PFC power supply further includes a rectifier bridge
  • the power factor correction circuit further includes a fast recovery diode
  • the sixth preset calculation formula is:
  • Vac is the instantaneous value of the input AC voltage of the PFC power supply
  • Vdc is the voltage across the electrolytic capacitor
  • D is the duty ratio of the on-time of the power switch
  • Vigbt is the conduction voltage drop of the power switch.
  • Vfrd is the conduction voltage drop of the fast recovery diode
  • Vbd is the conduction voltage drop of the rectifier bridge
  • L is the inductance value of the inductor
  • ⁇ Iin is the inductance of the inductor in a switching cycle of the power switch tube
  • Ts is the switching period of the power switch tube.
  • the PFC power supply further includes a rectifier bridge, and the seventh preset calculation formula is:
  • Vac is the instantaneous value of the input AC voltage of the PFC power supply
  • L is the inductance value of the inductor
  • Imid is the current midpoint value of the inductor
  • Ton is the opening time of the power switch tube in one switching cycle
  • Vigbt For the conduction voltage drop of the power switch tube
  • Vbd is the conduction voltage drop of the rectifier bridge.
  • the calculating an AC voltage effective value of the PFC power source according to the input AC voltage peak value or the input AC voltage instantaneous value is specifically:
  • Vac_rms is the AC voltage RMS value of the PFC power supply
  • Vac_peak is the AC voltage peak value of the power supply
  • sqrt(2) is the square root operation of the number "2”
  • Vac is the instantaneous value of the AC voltage of the power supply.
  • LPF (Vac ⁇ Vac) is a low-pass filtering operation on (Vac ⁇ Vac)
  • sqrt LPF (Vac ⁇ Vac)) is a pair ( LPF (Vac ⁇ Vac) ) Perform an square root operation.
  • the current operating parameters of the PFC power supply include:
  • the condition that the current operating parameter of the PFC power supply meets the power factor correction circuit of the PFC power supply is closed:
  • the current power value of the load connected to the PFC power source is less than the preset power value, or the current input current value of the PFC power source is less than the preset input current value, or the current input current peak value of the PFC power source is less than the preset input current peak value.
  • the current operating parameters of the PFC power supply satisfy the conditions for the power factor correction circuit of the PFC power supply to be turned on include:
  • the current power value of the load connected to the PFC power source is greater than or equal to the preset power value, or the current input current value of the PFC power source is greater than or equal to the preset input current value, or the current input current peak value of the PFC power source is greater than or equal to The preset input current peak.
  • an AC voltage RMS acquisition device for a PFC power supply including:
  • a working parameter obtaining module configured to acquire a current working parameter of the PFC power source
  • a peak voltage acquisition module configured to control a power factor correction circuit of the PFC power supply to be turned off when the current operating parameter of the PFC power supply meets a condition that the power factor correction circuit of the PFC power source is turned off, and obtain a voltage across the electrolytic capacitor of the PFC power supply, and then according to The voltage across the electrolytic capacitor acquires an input AC voltage peak of the PFC power supply;
  • the instantaneous voltage obtaining module is configured to control the power factor correction circuit to be turned on when the current operating parameter of the PFC power source meets the condition that the power factor correction circuit of the PFC power source is turned on, and determine the working mode of the power factor correction circuit, and then according to The working mode of the power factor correction circuit acquires an instantaneous value of the input AC voltage of the PFC power source;
  • the RMS calculation module is configured to calculate an RMS effective value of the PFC power source according to the input AC voltage peak value or the input AC voltage instantaneous value.
  • the peak voltage acquisition module comprises:
  • a voltage collecting unit configured to collect a voltage across the electrolytic capacitor in a voltage cycle of the input AC power of the PFC power source, and store the voltage as a plurality of voltage sampling samples;
  • a maximum voltage acquisition unit configured to acquire a voltage sample sample having the largest voltage value among the plurality of voltage sample samples
  • the peak voltage calculation unit calculates the input AC voltage peak value of the PFC power source according to the voltage value of the voltage sample sample with the largest voltage value and the first preset calculation formula.
  • the power factor correction circuit is a BOOST architecture
  • the first preset calculation formula is:
  • Vac_peak is the input AC voltage peak of the PFC power supply
  • Vdc_peak is the maximum value of the voltage applied across the electrolytic capacitor
  • Vfrd is the conduction voltage drop of the fast recovery diode in the power factor correction circuit
  • Vbd is the PFC power supply. The conduction voltage drop of the rectifier bridge.
  • the instantaneous voltage acquisition module comprises:
  • a first voltage detecting subunit for detecting a voltage across the electrolytic capacitor
  • a first state acquiring subunit configured to acquire a duty cycle of a switching period and an on time of the power switch tube
  • a current peak calculating unit configured to calculate a power factor correction according to a voltage across the electrolytic capacitor, a switching period of the power switch tube, a duty ratio of an on-time of the power switch tube, and a second preset calculation formula a current peak of the inductor when the circuit operates in a current critical mode;
  • a current peak detecting unit configured to detect a current current peak of the inductor
  • a first working mode determining unit configured to determine that the power factor correction circuit operates in a current continuous mode when a current current peak of the inductor is greater than a current peak of the inductor when the power factor correction circuit operates in a current critical mode ;
  • the power factor correction circuit is determined to operate in a current discontinuous mode when a current current peak of the inductor is less than a current peak of the inductor when the power factor correction circuit operates in a current critical mode.
  • the power factor correction circuit further includes a fast recovery diode, and the second preset calculation formula is:
  • Ipeak (Vdc + Vfrd - Vigbt) / L ⁇ D(1-D) ⁇ Ts;
  • Ipeak is the current peak current of the inductor
  • Vdc is the voltage across the electrolytic capacitor
  • Vfrd For the turn-on voltage drop of the fast recovery diode
  • Vigbt is the turn-on voltage drop of the power switch tube
  • L is the inductance value of the inductor
  • D is the duty cycle of the power switch tube on-time
  • Ts The switching period of the power switch tube.
  • the instantaneous voltage acquisition module further includes:
  • a first instantaneous voltage obtaining unit configured to acquire, when the power factor correction circuit operates in a current continuous mode or a current critical mode, a current change amount of the inductor in one switching cycle of the power switch tube, and according to The current change amount and the third preset calculation formula acquire an instantaneous value of the input AC voltage of the PFC power source;
  • a second instantaneous voltage obtaining unit configured to acquire an opening time of the power switch tube in one switching cycle when the power factor correction circuit operates in a current interrupt mode, and according to the power switch tube in one cycle
  • the opening and the fourth preset calculation formula obtain the instantaneous value of the input AC voltage of the PFC power source.
  • the PFC power supply further includes a rectifier bridge
  • the power factor correction circuit further includes a fast recovery diode
  • the third preset calculation formula is:
  • Vac is the instantaneous value of the input AC voltage of the PFC power supply
  • Vdc is the voltage across the electrolytic capacitor
  • D is the duty ratio of the on-time of the power switch
  • Vigbt is the conduction voltage drop of the power switch.
  • Vfrd is the conduction voltage drop of the fast recovery diode
  • Vbd is the conduction voltage drop of the rectifier bridge
  • L is the inductance value of the inductor
  • ⁇ Iin is the inductance of the inductor in a switching cycle of the power switch tube
  • Ts is the switching period of the power switch tube.
  • the PFC power supply further includes a rectifier bridge, and the fourth preset calculation formula is:
  • Vac is the instantaneous value of the input AC voltage of the PFC power supply
  • L is the inductance value of the inductor
  • Ipeak is the current peak value of the inductor
  • Ton is the opening time of the power switch tube in one switching cycle
  • Vigb is the The conduction voltage drop of the power switch tube
  • Vbd is the conduction voltage drop of the rectifier bridge.
  • the instantaneous voltage acquisition module comprises:
  • a second voltage detecting subunit for detecting a voltage across the electrolytic capacitor
  • a second state acquiring subunit configured to acquire a duty cycle of a switching period and an on time of the power switch tube
  • a current midpoint value calculation unit configured to calculate power according to a voltage across the electrolytic capacitor, a switching period of the power switch tube, a duty ratio of an on-time of the power switch tube, and a fifth preset calculation formula a current midpoint value of the inductor when the factor correction circuit operates in a current critical mode;
  • a current midpoint value detecting unit configured to detect a current current midpoint value of the inductor
  • a second working mode determining unit configured to determine that the power factor correction circuit works when a current midpoint value of the inductor is greater than a current midpoint value of the inductor when the power factor correction circuit operates in a current critical mode In current continuous mode;
  • the current current midpoint value of the inductor is equal to a current midpoint value of the inductor when the power factor correction circuit operates in a current critical mode, and determining that the power factor correction circuit operates in a current critical mode;
  • the power factor correction circuit is determined to operate in a current discontinuous mode when a current midpoint value of the inductor is less than a current midpoint value of the inductor when the power factor correction circuit operates in a current critical mode.
  • the power factor correction circuit further includes a fast recovery diode, and the fifth preset calculation formula is:
  • Imid (Vdc + Vfrd - Vigbt) / L ⁇ D (1-D) ⁇ Ts/2;
  • Imid is the current current midpoint value of the inductor
  • Vdc is the voltage across the electrolytic capacitor
  • Vfrd For the turn-on voltage drop of the fast recovery diode
  • Vigbt is the turn-on voltage drop of the power switch tube
  • L is the inductance value of the inductor
  • D is the duty cycle of the power switch tube on-time
  • Ts The switching period of the power switch tube.
  • the instantaneous voltage acquisition module further includes:
  • a third instantaneous voltage acquiring unit configured to acquire a current change amount of the inductor in one switching cycle of the power switch tube when the power factor correction circuit operates in a current continuous mode or a current critical mode, and according to the The current variation amount and the sixth preset calculation formula obtain an instantaneous value of the input AC voltage of the PFC power source;
  • a fourth instantaneous voltage obtaining unit configured to acquire an opening time of the power switch tube in one switching cycle when the power factor correction circuit operates in a current interrupt mode, and according to the power switch tube in one cycle
  • the turn-on time and the seventh preset calculation formula obtain the instantaneous value of the input AC voltage of the PFC power source.
  • the PFC power supply further includes a rectifier bridge
  • the power factor correction circuit further includes a fast recovery diode
  • the sixth preset calculation formula is:
  • Vac is the instantaneous value of the input AC voltage of the PFC power supply
  • Vdc is the voltage across the electrolytic capacitor
  • D is the duty ratio of the on-time of the power switch
  • Vigbt is the conduction voltage drop of the power switch.
  • Vfrd is the conduction voltage drop of the fast recovery diode
  • Vbd is the conduction voltage drop of the rectifier bridge
  • L is the inductance value of the inductor
  • ⁇ Iin is the inductance of the inductor in a switching cycle of the power switch tube
  • Ts is the switching period of the power switch tube.
  • the PFC power supply further includes a rectifier bridge, and the seventh preset calculation formula is:
  • Vac is the instantaneous value of the input AC voltage of the PFC power supply
  • L is the inductance value of the inductor
  • Imid is the current midpoint value of the inductor
  • Ton is the opening time of the power switch tube in one switching cycle
  • Vigbt For the conduction voltage drop of the power switch tube
  • Vbd is the conduction voltage drop of the rectifier bridge.
  • the calculation module according to the effective value is specifically used to:
  • Vac_rms is the AC voltage RMS value of the PFC power supply
  • Vac_peak is the AC voltage peak value of the power supply
  • sqrt(2) is the square root operation of the number "2”
  • Vac is the instantaneous value of the AC voltage of the power supply.
  • LPF (Vac ⁇ Vac) is a low-pass filtering operation on (Vac ⁇ Vac)
  • sqrt LPF (Vac ⁇ Vac)) is a pair ( LPF (Vac ⁇ Vac) ) Perform an square root operation.
  • the current operating parameters of the PFC power supply include:
  • the condition that the current operating parameter of the PFC power supply meets the power factor correction circuit of the PFC power supply is closed:
  • the current power value of the load connected to the PFC power source is less than the preset power value, or the current input current value of the PFC power source is less than the preset input current value, or the current input current peak value of the PFC power source is less than the preset input current peak value.
  • the current operating parameters of the PFC power supply satisfy the conditions for the power factor correction circuit of the PFC power supply to be turned on include:
  • the current power value of the load connected to the PFC power source is greater than or equal to the preset power value, or the current input current value of the PFC power source is greater than or equal to the preset input current value, or the current input current peak value of the PFC power source is greater than or equal to The preset input current peak.
  • the current operating parameters of the PFC power supply are obtained. Then, if the current operating parameter of the PFC power supply satisfies the condition that the power factor correction circuit of the PFC power supply is turned off, the power factor correction circuit that controls the PFC power supply is turned off, and the peak value of the input AC voltage of the PFC power source is obtained according to the voltage across the electrolytic capacitor; When the current operating parameter of the PFC power supply meets the condition that the power factor correction circuit of the PFC power supply is turned on, the PFC power supply is turned on, and the instantaneous value of the input AC voltage of the PFC power source is obtained according to the working mode of the power factor correction circuit.
  • the AC voltage rms value of the PFC power supply is calculated based on the input AC voltage peak or the input AC voltage instantaneous value. Since the technical solution acquires the instantaneous value of the input AC voltage of the PFC power source according to the working mode of the power factor correction circuit. Therefore, the technical solution can avoid the interference of the current interruption mode to the AC voltage RMS acquisition result of the PFC power supply, and the technical solution of the present invention has the characteristics of high accuracy compared with the prior art.
  • FIG. 1 is a schematic structural diagram of a circuit of an embodiment of a PFC power supply according to the present invention
  • FIG. 2 is a schematic flow chart of an embodiment of an AC voltage effective value acquisition method of a PFC power supply according to the present invention
  • step S200 in FIG. 2 is a schematic diagram showing a refinement process of an embodiment of step S200 in FIG. 2;
  • step S300 in FIG. 2 is a schematic diagram showing the refinement process of an embodiment of step S300 in FIG. 2;
  • FIG. 5 is a schematic diagram showing a refinement process of another embodiment of step S300 in FIG. 2;
  • FIG. 6 is a schematic diagram of functional modules of an embodiment of an AC voltage effective value obtaining apparatus for a PFC power supply according to the present invention
  • FIG. 7 is a schematic diagram of functional modules of an embodiment of the peak voltage acquisition module of FIG. 6;
  • FIG. 8 is a schematic diagram of functional modules of an embodiment of the instantaneous voltage acquisition module of FIG. 6;
  • FIG. 9 is a schematic diagram of functional modules of another embodiment of the instantaneous voltage acquisition module of FIG. 6.
  • FIG. 9 is a schematic diagram of functional modules of another embodiment of the instantaneous voltage acquisition module of FIG. 6.
  • first, second and the like in the present invention are only for the purpose of description, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” and “second” may include at least one of the features, either explicitly or implicitly.
  • the technical solutions between the various embodiments may be combined with each other, but must be based on the realization of those skilled in the art, and when the combination of the technical solutions is contradictory or impossible to implement, it should be considered that the combination of the technical solutions does not exist. It is also within the scope of protection required by the present invention.
  • the invention provides a method for obtaining an RMS effective value of a PFC power source.
  • the PFC power supply includes a power factor correction circuit
  • the topology of the power factor correction circuit has various options, such as BOOST, BUCK, and the like.
  • the PFC power supply includes a rectifier bridge BD, an electrolytic capacitor C, and a BOOST type power factor correction circuit 10.
  • the BOOST type power factor correction circuit 10 includes an inductor L, a power switch IGBT, a fast recovery diode FRD, and a controller.
  • the input end of the rectifier bridge BD is used to connect the input AC power source AC
  • the positive end of the rectifier bridge BD is connected to the first end of the inductor L, the second end of the inductor L, the input end of the power switch tube IGBT and the fast recovery diode FRD
  • the anode is interconnected
  • the cathode of the fast recovery diode FRD is connected to the anode of the electrolytic capacitor C
  • the connection node is used to connect the positive pole of the load.
  • the negative end of the rectifier bridge BD, the output end of the power switch tube IGBT and the negative pole of the electrolytic capacitor C are interconnected, and the connection node is used for connecting the negative pole of the load, and the controlled end of the power switch tube IGBT is connected with the control end of the controller.
  • the controller is configured to output a PWM wave to the controlled end of the power switch IGBT to enable the power factor correction circuit 10 to be turned on to implement a power factor correction function.
  • the current is output from the positive terminal of the rectifier bridge BD, and sequentially returns to the negative terminal of the rectifier bridge BD via the inductor L, the fast recovery diode FRD, and the electrolytic capacitor C (and the load).
  • the inductor L current continues to rise; when the output voltage of the rectifier bridge BD is lower than the voltage of the electrolytic capacitor C, the current of the inductor L decreases. Its voltage relationship satisfies:
  • Vac Input the instantaneous value of the AC voltage (absolute value) for the PFC power supply
  • Vdc the electrolytic capacitor C voltage
  • Iin is the instantaneous value of the inductor L current
  • p is the differential operator
  • L is the inductance value of the inductor L
  • Vbd is the rectifier bridge BD conduction voltage Drop
  • Vigbt is the power switch tube IGBT turn-on voltage drop
  • Vfrd the fast recovery diode FRD turn-on voltage drop.
  • the current peak value Ipeak of the inductor L is the current of the power switch tube IGBT from the turn-on to the turn-off time; the current midpoint value Imid of the inductor L is the current at the midpoint of the power switch IGBT turn-on.
  • the current peak value of the inductor L and the current midpoint value of the inductor L satisfy:
  • the AC voltage RMS acquisition method of the PFC power supply includes the following steps:
  • the current operating parameter of the PFC power supply may be the power value of the load connected to the PFC power supply; the input current value of the PFC power supply, or the input current peak of the PFC power supply; or the load connected to the PFC power supply. Any combination of the power value, the input current value of the PFC power supply, and the input current peak of the PFC power supply.
  • the PFC power supply output power supplies power to the load
  • the PFC power supply outputs the corrected power supply to the load
  • the power factor correction circuit 10 is turned off, the PFC power supply outputs the power supply without the power correction to the load.
  • the load can be an actual electrical device, such as a motor, or an analog device for testing, such as a resistor.
  • the current path of the PFC power supply may be connected in series to detect a resistance (not shown), one end of which is grounded, and the other end is connected to the negative terminal of the rectifier bridge BD or the negative pole of the load.
  • the voltage detecting device detects the voltage falling on the other end of the detecting resistor, and the input current of the PFC power source can be obtained.
  • the other end of the sense resistor is connected to the negative terminal of the rectifier bridge BD
  • the detected voltage is a negative voltage
  • the other end of the sense resistor is connected to the negative pole of the load
  • the detected voltage is a positive voltage.
  • the other end of the detection circuit is connected to the negative pole of the load.
  • the current operating parameter of the PFC power supply satisfies the condition that the power factor correction circuit 10 of the PFC power supply is turned off.
  • the current operating parameter of the PFC power supply is smaller than the preset operating parameter.
  • the current power value of the load connected to the PFC power source is less than the preset power value
  • the current input current value of the PFC power source is less than the preset input current value
  • the current input current peak value of the PFC power source is less than the preset input current peak value, etc. Etc., not listed here.
  • the meaning of setting the power factor correction circuit 10 is to reduce the transmission loss of the power supply.
  • the transmission loss base of the power source is small, and the power factor correction circuit 10 The effect is relatively weak, and even the power consumption of the power factor correction circuit 10 itself is greater than the power transmission loss reduced by the power factor correction circuit 10.
  • the technical solution can select whether the power factor correction circuit 10 needs to be turned on according to the actual working state of the PFC power source, which not only facilitates the acquisition of the RMS value of the PFC power source, but also keeps the reactive power loss of the PFC power source at a relatively low level. status.
  • obtaining a current working parameter of the PFC power source For example, obtaining a current working parameter of the PFC power source; calculating a difference between a current working parameter of the PFC power source and a preset working parameter; if the difference is less than zero, determining that the current working parameter of the PFC power source is less than a preset working parameter. In this way, it can be quickly determined whether the current operating parameter of the PFC power supply is less than a preset operating parameter.
  • the preset PFC power input current value can be selected from 1 amp to 2 amps.
  • the voltage across the electrolytic capacitor C of the PFC power supply is obtained as follows, and the input AC voltage peak of the PFC power supply is obtained according to the voltage across the electrolytic capacitor C:
  • S210 Collect a voltage across the electrolytic capacitor C in a voltage cycle of the input AC power supply AC of the PFC power source, and store the voltage as a plurality of voltage sampling samples;
  • the more the sampled voltage samples are stored in one voltage cycle of the input AC power source AC of the PFC power source the closer the voltage value of the voltage sample sample with the largest voltage value is to the peak value of the input AC voltage of the PFC power source.
  • the stored voltage sample samples are between 50 and 100.
  • Vac_peak is the input AC voltage peak of the PFC power supply
  • Vdc_peak is the maximum value of the voltage applied to the electrolytic capacitor C.
  • the above formula (11) is the first preset calculation formula.
  • the current operating parameter of the PFC power supply satisfies the condition that the power factor correction circuit 10 of the PFC power supply is turned on.
  • the current working parameter of the PFC power supply is greater than or equal to the preset working parameter.
  • the current power value of the load connected to the PFC power source is greater than or equal to the preset power value
  • the current input current value of the PFC power source is greater than or equal to the preset input current value
  • the current input current peak value of the PFC power source is greater than or equal to the preset.
  • the input current peaks, etc., are not listed here.
  • the meaning of setting the power factor correction circuit 10 is to reduce the transmission loss of the power supply.
  • the current operating parameters of the PFC power supply including the power value of the load connected to the PFC power supply, the input current value of the PFC power supply, the peak value of the input current of the PFC power supply, etc.
  • the transmission loss base of the power supply is large
  • the power factor correction circuit is large.
  • the role of 10 is relatively obvious. Therefore, the technical solution can select whether the power factor correction circuit 10 needs to be turned on according to the actual working state of the PFC power source, which not only facilitates the acquisition of the RMS value of the PFC power source, but also keeps the reactive power loss of the PFC power source at a relatively low level. status.
  • obtaining a current working parameter of the PFC power source For example, obtaining a current working parameter of the PFC power source; calculating a difference between a current working parameter of the PFC power source and a preset working parameter; if the difference is greater than or equal to zero, determining that a current working parameter of the PFC power source is greater than or equal to a preset working parameter. In this way, it can be quickly determined whether the current operating parameter of the PFC power supply is greater than or equal to the preset operating parameter.
  • the preset PFC power input current value can be selected from 1 amp to 2 amps.
  • the working mode of the power factor correction circuit is determined as follows, and then the instantaneous value of the input AC voltage of the PFC power source is obtained according to the working mode of the power factor correction circuit:
  • the duty ratio of the on-time of the power switch IGBT refers to the duty ratio of the on-time of the power switch IGBT in one current switching cycle of the power switch IGBT.
  • the duty ratio of the on-time of the obtained power switch IGBT may be different at different times.
  • the second preset calculation formula can be selected as follows:
  • the current peak value of the inductor L refers to the current value flowing through the inductor L when the power switch tube IGBT is switched from on to off at the current switching period of the power switch IGBT.
  • a sampling resistor (not shown) can be added to assist in detecting the current of the load.
  • the first end of the sampling resistor is connected to the negative terminal of the rectifier bridge BD, and the second end of the sampling resistor, the output end of the power switching transistor IGBT, and the negative terminal of the electrolytic capacitor C are interconnected.
  • the resistance of the sampling resistor is known, the voltage falling on the second end of the sampling resistor can be detected, and the current of the PFC power supply, that is, the current flowing through the inductor L can be obtained.
  • the power factor correction circuit 10 in one switching cycle of the power switch IGBT: if the power factor correction circuit 10 operates in the current continuous mode, when the power switch IGBT is turned on, the current flowing through the inductor L is greater than zero, in the power switch When the tube IGBT is in the on state, the current flowing through the inductor L linearly increases. If the power factor correction circuit 10 operates in the current critical mode, the current flowing through the inductor L is equal to zero when the power switch IGBT is turned on, and the current flowing through the inductor L linearly increases when the power switch IGBT is turned on. .
  • the current peak value of the inductance L when the power factor correction circuit 10 operates in the current continuous mode is greater than the current peak value of the inductance L when the power factor correction circuit 10 operates in the current critical mode.
  • the technical solution has the characteristics of high accuracy.
  • the power factor correction circuit 10 in one switching cycle of the power switch IGBT: if the power factor correction circuit 10 operates in the current interrupt mode, the current flowing through the inductor L is equal to zero before the power switch IGBT ends the off state. When the power switch IGBT is in the off state, the current flowing through the inductor L decreases linearly. If the power factor correction circuit 10 operates in the current critical mode, the current flowing through the inductor L is greater than zero before the power switch IGBT is turned off, and the current flowing through the inductor L when the power switch IGBT is in the off state. It decreases linearly.
  • the current peak value of the inductance L when the power factor correction circuit 10 operates in the current critical mode is greater than the current peak value of the inductance L when the power factor correction circuit 10 operates in the current interruption mode.
  • the technical solution has the characteristics of high accuracy.
  • the third preset formula can be selected as:
  • the fourth preset formula can be selected as:
  • the technical solution determines the operating mode of the power factor correction circuit 10 according to the current peak value of the inductor L, and selects different calculation formulas for different operating modes of the power factor correction circuit 10 to calculate the instantaneous value of the input AC voltage of the PFC power supply.
  • the mode of determining the operating mode of the power factor correction circuit 10 is reliable, and the result of calculating the instantaneous value of the input AC voltage of the PFC power source is accurate.
  • the working mode of the power factor correction circuit is determined as follows, and then the instantaneous value of the input AC voltage of the PFC power source is obtained according to the working mode of the power factor correction circuit:
  • the duty ratio of the on-time of the power switch IGBT refers to the duty ratio of the on-time of the power switch IGBT in one current switching cycle of the power switch IGBT.
  • the duty ratio of the on-time of the obtained power switch IGBT may be different at different times.
  • the fifth preset calculation formula can be selected as follows:
  • Imid (Vdc + Vfrd – Vigbt) / L ⁇ D(1-D) ⁇ Ts/2 ;(15)
  • Imid is the current midpoint value of the inductor L when the power factor correction circuit 10 operates in the current critical mode.
  • the current current midpoint value of the inductor L refers to the current value flowing through the inductor L at the midpoint of the power switch IGBT turning on at the current switching cycle of the power switch IGBT.
  • a sampling resistor (not shown) can be added to assist in detecting the current of the load.
  • the first end of the sampling resistor is connected to the negative terminal of the rectifier bridge BD, and the second end of the sampling resistor, the output end of the power switching transistor IGBT, and the negative terminal of the electrolytic capacitor C are interconnected.
  • the resistance of the sampling resistor is known, the voltage falling on the second end of the sampling resistor can be detected, and the current of the PFC power supply, that is, the current flowing through the inductor L can be obtained.
  • the power factor correction circuit 10 in one switching cycle of the power switch IGBT: if the power factor correction circuit 10 operates in the current continuous mode, when the power switch IGBT is turned on, the current flowing through the inductor L is greater than zero, in the power switch When the tube IGBT is in the on state, the current flowing through the inductor L linearly increases. If the power factor correction circuit 10 operates in the current critical mode, the current flowing through the inductor L is equal to zero when the power switch IGBT is turned on, and the current flowing through the inductor L linearly increases when the power switch IGBT is turned on. .
  • the current midpoint value of the inductor L when the power factor correction circuit 10 operates in the current continuous mode is greater than the current midpoint value of the inductor L when the power factor correction circuit 10 operates in the current critical mode.
  • the technical solution has the characteristics of high accuracy.
  • the power factor correction circuit 10 in one switching cycle of the power switch IGBT: if the power factor correction circuit 10 operates in the current interrupt mode, the current flowing through the inductor L is equal to zero before the power switch IGBT ends the off state. When the power switch IGBT is in the off state, the current flowing through the inductor L decreases linearly. If the power factor correction circuit 10 operates in the current critical mode, the current flowing through the inductor L is greater than zero before the power switch IGBT is turned off, and the current flowing through the inductor L when the power switch IGBT is in the off state. It decreases linearly.
  • the current peak value of the inductance L when the power factor correction circuit 10 operates in the current critical mode is greater than the current peak value of the inductance L when the power factor correction circuit 10 operates in the current interruption mode.
  • the current peak of the inductor L is twice the midpoint of the inductor L current. Therefore, when the power factor correction circuit 10 operates in the current critical mode, the current midpoint value of the inductor L is greater than the current midpoint value of the inductor L when the power factor correction circuit 10 operates in the current discontinuous mode.
  • the technical solution has the characteristics of high accuracy.
  • the sixth preset formula can be selected as:
  • the seventh preset formula can be selected as:
  • the technical solution determines the operating mode of the power factor correction circuit 10 according to the current midpoint value of the inductor L, and selects different calculation formulas for different operating modes of the power factor correction circuit 10 to calculate the instantaneous value of the input AC voltage of the PFC power supply.
  • the mode of determining the operating mode of the power factor correction circuit 10 is reliable, and the result of calculating the instantaneous value of the input AC voltage of the PFC power source is accurate.
  • S400 Calculate an RMS effective value of the PFC power source according to the input AC voltage peak value or the input AC voltage instantaneous value.
  • the AC voltage effective value of the PFC power source is calculated according to the input AC voltage peak value and the eighth preset formula; or the AC voltage effective value of the PFC power source is calculated according to the input AC voltage instantaneous value and the ninth preset formula.
  • Vac_rms is the AC voltage RMS value of the PFC power supply
  • Vac_peak is the AC voltage peak value of the power supply
  • sqrt(2) is the square root operation of the number "2”
  • Vac is the instantaneous value of the AC voltage of the power supply.
  • LPF (Vac ⁇ Vac) is a low-pass filtering operation on (Vac ⁇ Vac)
  • sqrt LPF (Vac ⁇ Vac)) is a pair ( LPF (Vac ⁇ Vac) ) Perform an square root operation.
  • the current operating parameters of the PFC power supply are obtained. Then, if the current operating parameter of the PFC power supply satisfies the condition that the power factor correction circuit 10 of the PFC power supply is turned off, the power factor correction circuit 10 that controls the PFC power supply is turned off, and the input AC voltage of the PFC power source is obtained according to the voltage across the electrolytic capacitor C. If the current operating parameter of the PFC power supply satisfies the condition that the power factor correction circuit 10 of the PFC power supply is turned on, the PFC power supply is turned on, and the instantaneous value of the input AC voltage of the PFC power source is obtained according to the operation mode of the power factor correction circuit 10.
  • the AC voltage rms value of the PFC power supply is calculated based on the input AC voltage peak or the input AC voltage instantaneous value. Since the technical solution acquires the instantaneous value of the input AC voltage of the PFC power source according to the working mode of the power factor correction circuit. Therefore, the technical solution can avoid the interference of the current interruption mode to the AC voltage RMS acquisition result of the PFC power supply, and the technical solution of the present invention has the characteristics of high accuracy compared with the prior art.
  • the present invention also provides an input AC voltage RMS acquisition device for a PFC power supply. Please refer to FIG. 6.
  • the apparatus includes:
  • the working parameter obtaining module 100 is configured to acquire current working parameters of the PFC power source
  • the current operating parameter of the PFC power supply may be the power value of the load connected to the PFC power supply; the input current value of the PFC power supply, or the input current peak of the PFC power supply; or the load connected to the PFC power supply. Any combination of the power value, the input current value of the PFC power supply, and the input current peak of the PFC power supply.
  • the PFC power supply output power supplies power to the load
  • the PFC power supply outputs the corrected power supply to the load
  • the power factor correction circuit 10 is turned off, the PFC power supply outputs the power supply without the power correction to the load.
  • the load can be an actual electrical device, such as a motor, or an analog device for testing, such as a resistor.
  • the current path of the PFC power supply may be connected in series to detect a resistance (not shown), one end of which is grounded, and the other end is connected to the negative terminal of the rectifier bridge BD or the negative pole of the load.
  • the voltage detecting device detects the voltage falling on the other end of the detecting resistor, and the input current of the PFC power source can be obtained.
  • the other end of the sense resistor is connected to the negative terminal of the rectifier bridge BD
  • the detected voltage is a negative voltage
  • the other end of the sense resistor is connected to the negative pole of the load
  • the detected voltage is a positive voltage.
  • the other end of the detection circuit is connected to the negative pole of the load.
  • the peak voltage acquisition module 200 is configured to control the power factor correction circuit 10 of the PFC power supply to be turned off when the current operating parameter of the PFC power supply meets the condition that the power factor correction circuit 10 of the PFC power supply is turned off, and acquire the two ends of the electrolytic capacitor C of the PFC power supply. Voltage, and then according to the voltage across the electrolytic capacitor C to obtain the input AC voltage peak of the PFC power supply;
  • the current operating parameter of the PFC power supply satisfies the condition that the power factor correction circuit 10 of the PFC power supply is turned off.
  • the current operating parameter of the PFC power supply is smaller than the preset operating parameter.
  • the current power value of the load connected to the PFC power source is less than the preset power value
  • the current input current value of the PFC power source is less than the preset input current value
  • the current input current peak value of the PFC power source is less than the preset input current peak value, etc. Etc., not listed here.
  • the meaning of setting the power factor correction circuit 10 is to reduce the transmission loss of the power supply.
  • the transmission loss base of the power source is small, and the power factor correction circuit 10 The effect is relatively weak, and even the power consumption of the power factor correction circuit 10 itself is greater than the power transmission loss reduced by the power factor correction circuit 10.
  • the technical solution can select whether the power factor correction circuit 10 needs to be turned on according to the actual working state of the PFC power source, which not only facilitates the acquisition of the RMS value of the PFC power source, but also keeps the reactive power loss of the PFC power source at a relatively low level. status.
  • obtaining a current working parameter of the PFC power source For example, obtaining a current working parameter of the PFC power source; calculating a difference between a current working parameter of the PFC power source and a preset working parameter; if the difference is less than zero, determining that the current working parameter of the PFC power source is less than a preset working parameter. In this way, it can be quickly determined whether the current operating parameter of the PFC power supply is less than a preset operating parameter.
  • the preset PFC power input current value can be selected from 1 amp to 2 amps.
  • the peak voltage acquisition module 200 includes:
  • the voltage collecting unit 210 is configured to collect a voltage across the electrolytic capacitor in a voltage cycle of the input AC power of the PFC power source, and store the voltage as a plurality of voltage sampling samples;
  • the maximum voltage acquiring unit 220 is configured to acquire a voltage sampling sample having the largest voltage value among the plurality of voltage sampling samples
  • the peak voltage calculation unit 230 calculates the input AC voltage peak value of the PFC power source according to the voltage value of the voltage sample sample having the largest voltage value and the first preset calculation formula.
  • the more the sampled voltage samples are stored in one voltage cycle of the input AC power source AC of the PFC power source the closer the voltage value of the voltage sample sample with the largest voltage value is to the peak value of the input AC voltage of the PFC power source.
  • the stored voltage sample samples are between 50 and 100.
  • Vac_peak is the input AC voltage peak of the PFC power supply
  • Vdc_peak is the maximum value of the voltage applied to the electrolytic capacitor C.
  • the above formula (20) is the first preset calculation formula.
  • the instantaneous voltage acquisition module 300 is configured to control the power factor correction circuit 10 to be turned on when the current operating parameter of the PFC power supply meets the ON condition of the power factor correction circuit 10 of the PFC power supply, and determine the operation mode of the power factor correction circuit 10, and then according to The working mode of the power factor correction circuit 10 acquires an instantaneous value of the input AC voltage of the PFC power source;
  • the current operating parameter of the PFC power supply satisfies the condition that the power factor correction circuit 10 of the PFC power supply is turned on.
  • the current working parameter of the PFC power supply is greater than or equal to the preset working parameter.
  • the current power value of the load connected to the PFC power source is greater than or equal to the preset power value
  • the current input current value of the PFC power source is greater than or equal to the preset input current value
  • the current input current peak value of the PFC power source is greater than or equal to the preset.
  • the input current peaks, etc., are not listed here.
  • the meaning of setting the power factor correction circuit 10 is to reduce the transmission loss of the power supply.
  • the current operating parameters of the PFC power supply including the power value of the load connected to the PFC power supply, the input current value of the PFC power supply, the peak value of the input current of the PFC power supply, etc.
  • the transmission loss base of the power supply is large
  • the power factor correction circuit is large.
  • the role of 10 is relatively obvious. Therefore, the technical solution can select whether the power factor correction circuit 10 needs to be turned on according to the actual working state of the PFC power source, which not only facilitates the acquisition of the RMS value of the PFC power source, but also keeps the reactive power loss of the PFC power source at a relatively low level. status.
  • obtaining a current working parameter of the PFC power source For example, obtaining a current working parameter of the PFC power source; calculating a difference between a current working parameter of the PFC power source and a preset working parameter; if the difference is greater than or equal to zero, determining that a current working parameter of the PFC power source is greater than or equal to a preset working parameter. In this way, it can be quickly determined whether the current operating parameter of the PFC power supply is greater than or equal to the preset operating parameter.
  • the preset PFC power input current value can be selected from 1 amp to 2 amps.
  • the instantaneous voltage obtaining module 300 includes:
  • the first voltage detecting subunit 311 is configured to detect a voltage across the electrolytic capacitor
  • a first state acquisition sub-unit 312 configured to acquire a duty cycle of a switching period and an on-time of the power switch tube;
  • the duty ratio of the on-time of the power switch IGBT refers to the duty ratio of the on-time of the power switch IGBT in one current switching cycle of the power switch IGBT.
  • the duty ratio of the on-time of the obtained power switch IGBT may be different at different times.
  • the current peak calculating unit 320 is configured to calculate the power factor correction circuit to work on the current threshold according to the voltage across the electrolytic capacitor, the switching period of the power switch tube, the duty ratio of the on-time of the power switch tube, and the second preset calculation formula.
  • the second preset calculation formula can be selected as follows:
  • the current peak detecting unit 330 is configured to detect a current peak current of the inductor
  • the current peak value of the inductor L refers to the current value flowing through the inductor L when the power switch tube IGBT is switched from on to off at the current switching period of the power switch IGBT.
  • a sampling resistor (not shown) can be added to assist in detecting the current of the load.
  • the first end of the sampling resistor is connected to the negative terminal of the rectifier bridge BD, and the second end of the sampling resistor, the output end of the power switching transistor IGBT, and the negative terminal of the electrolytic capacitor C are interconnected.
  • the resistance of the sampling resistor is known, the voltage falling on the second end of the sampling resistor can be detected, and the current of the PFC power supply, that is, the current flowing through the inductor L can be obtained.
  • the first working mode determining unit 340 is configured to determine that the power factor correction circuit operates in the current continuous mode when the current current peak of the inductor is greater than a current peak of the inductor when the power factor correction circuit operates in the current critical mode;
  • the power factor correction circuit 10 in one switching cycle of the power switch IGBT: if the power factor correction circuit 10 operates in the current continuous mode, when the power switch IGBT is turned on, the current flowing through the inductor L is greater than zero, in the power switch When the tube IGBT is in the on state, the current flowing through the inductor L linearly increases. If the power factor correction circuit 10 operates in the current critical mode, the current flowing through the inductor L is equal to zero when the power switch IGBT is turned on, and the current flowing through the inductor L linearly increases when the power switch IGBT is turned on. .
  • the current peak value of the inductance L when the power factor correction circuit 10 operates in the current continuous mode is greater than the current peak value of the inductance L when the power factor correction circuit 10 operates in the current critical mode.
  • the power factor correction circuit 10 During one switching cycle of the power switch IGBT: if the power factor correction circuit 10 operates in the current interrupt mode, the current flowing through the inductor L is equal to zero before the power switch IGBT is turned off, and the IGBT is at the power switch In the off state, the current flowing through the inductor L decreases linearly. If the power factor correction circuit 10 operates in the current critical mode, the current flowing through the inductor L is greater than zero before the power switch IGBT is turned off, and the current flowing through the inductor L when the power switch IGBT is in the off state. It decreases linearly.
  • the current peak value of the inductance L when the power factor correction circuit 10 operates in the current critical mode is greater than the current peak value of the inductance L when the power factor correction circuit 10 operates in the current interruption mode.
  • the technical solution has the characteristics of high accuracy.
  • the first instantaneous voltage obtaining unit 351 is configured to acquire a current change amount of the inductor in one switching cycle of the power switch tube when the power factor correction circuit operates in the current continuous mode or the current critical mode, and according to the current change amount and the first The three preset calculation formulas obtain the instantaneous value of the input AC voltage of the PFC power source;
  • the third preset formula can be selected as:
  • the second instantaneous voltage obtaining unit 352 is configured to obtain an opening time of the power switch tube in one switching cycle when the power factor correction circuit operates in the current interrupt mode, and open and fourth according to the power switch tube in one cycle
  • the preset calculation formula obtains the instantaneous value of the input AC voltage of the PFC power supply.
  • the fourth preset formula can be selected as:
  • the technical solution determines the operating mode of the power factor correction circuit 10 according to the current peak value of the inductor L, and selects different calculation formulas for different operating modes of the power factor correction circuit 10 to calculate the instantaneous value of the input AC voltage of the PFC power supply.
  • the mode of determining the operating mode of the power factor correction circuit 10 is reliable, and the result of calculating the instantaneous value of the input AC voltage of the PFC power source is accurate.
  • the instantaneous voltage obtaining module 300 includes:
  • a second voltage detecting subunit 511 for detecting a voltage across the electrolytic capacitor
  • a second state acquiring sub-unit 512 configured to acquire a duty cycle of a switching period and an on-time of the power switch tube
  • the duty ratio of the on-time of the power switch IGBT refers to the duty ratio of the on-time of the power switch IGBT in one current switching cycle of the power switch IGBT.
  • the duty ratio of the on-time of the obtained power switch IGBT may be different at different times.
  • the current midpoint value calculation unit 520 is configured to calculate the power factor correction circuit according to the voltage across the electrolytic capacitor, the switching period of the power switch tube, the duty ratio of the on-time of the power switch tube, and the fifth preset calculation formula.
  • the midpoint value of the current of the inductor in the current critical mode is configured to calculate the power factor correction circuit according to the voltage across the electrolytic capacitor, the switching period of the power switch tube, the duty ratio of the on-time of the power switch tube, and the fifth preset calculation formula.
  • the fifth preset calculation formula can be selected as follows:
  • Imid (Vdc + Vfrd - Vigbt) / L ⁇ D (1-D) ⁇ Ts / 2; (24)
  • Imid is the current midpoint value of the inductor L when the power factor correction circuit 10 operates in the current critical mode.
  • the current midpoint value detecting unit 530 is configured to detect a current current midpoint value of the inductor
  • the current current midpoint value of the inductor L refers to the current value flowing through the inductor L at the midpoint of the power switch IGBT turning on at the current switching cycle of the power switch IGBT.
  • a sampling resistor (not shown) can be added to assist in detecting the current of the load.
  • the first end of the sampling resistor is connected to the negative terminal of the rectifier bridge BD, and the second end of the sampling resistor, the output end of the power switching transistor IGBT, and the negative terminal of the electrolytic capacitor C are interconnected.
  • the resistance of the sampling resistor is known, the voltage falling on the second end of the sampling resistor can be detected, and the current of the PFC power supply, that is, the current flowing through the inductor L can be obtained.
  • the second working mode determining unit 540 is configured to determine that the power factor correction circuit operates in the current continuous mode when the current current midpoint value of the inductor is greater than a current midpoint value of the inductor when the power factor correction circuit operates in the current critical mode;
  • the current current midpoint value of the inductor is equal to the current midpoint value of the inductor when the power factor correction circuit operates in the current critical mode, and the power factor correction circuit is determined to operate in the current critical mode;
  • the current midpoint value of the inductor is less than the current midpoint value of the inductor when the power factor correction circuit operates in the current critical mode, and the power factor correction circuit is determined to operate in the current discontinuous mode.
  • the power factor correction circuit 10 in one switching cycle of the power switch IGBT: if the power factor correction circuit 10 operates in the current continuous mode, when the power switch IGBT is turned on, the current flowing through the inductor L is greater than zero, in the power switch When the tube IGBT is in the on state, the current flowing through the inductor L linearly increases. If the power factor correction circuit 10 operates in the current critical mode, the current flowing through the inductor L is equal to zero when the power switch IGBT is turned on, and the current flowing through the inductor L linearly increases when the power switch IGBT is turned on. .
  • the current midpoint value of the inductor L when the power factor correction circuit 10 operates in the current continuous mode is greater than the current midpoint value of the inductor L when the power factor correction circuit 10 operates in the current critical mode.
  • the power factor correction circuit 10 During one switching cycle of the power switch IGBT: if the power factor correction circuit 10 operates in the current interrupt mode, the current flowing through the inductor L is equal to zero before the power switch IGBT is turned off, and the IGBT is at the power switch In the off state, the current flowing through the inductor L decreases linearly. If the power factor correction circuit 10 operates in the current critical mode, the current flowing through the inductor L is greater than zero before the power switch IGBT is turned off, and the current flowing through the inductor L when the power switch IGBT is in the off state. It decreases linearly.
  • the current peak value of the inductance L when the power factor correction circuit 10 operates in the current critical mode is greater than the current peak value of the inductance L when the power factor correction circuit 10 operates in the current interruption mode.
  • the current peak of the inductor L is twice the midpoint of the inductor L current. Therefore, when the power factor correction circuit 10 operates in the current critical mode, the current midpoint value of the inductor L is greater than the current midpoint value of the inductor L when the power factor correction circuit 10 operates in the current discontinuous mode.
  • the technical solution has the characteristics of high accuracy.
  • the third instantaneous voltage obtaining unit 551 is configured to obtain, when the power factor correction circuit operates in the current continuous mode or the current critical mode, acquire a current change amount of the inductor in one switching cycle of the power switch tube, and according to the current change amount and the sixth
  • the preset calculation formula obtains an instantaneous value of the input AC voltage of the PFC power source
  • the sixth preset formula can be selected as:
  • the fourth instantaneous voltage obtaining unit 552 is configured to obtain an opening time of the power switch tube in one switching period when the power factor correction circuit operates in the current interrupt mode, and according to the opening time and the first time of the power switch tube in one cycle Seven preset calculation formulas obtain the instantaneous value of the input AC voltage of the PFC power supply.
  • the seventh preset formula can be selected as:
  • the technical solution determines the operating mode of the power factor correction circuit 10 according to the current midpoint value of the inductor L, and selects different calculation formulas for different operating modes of the power factor correction circuit 10 to calculate the instantaneous value of the input AC voltage of the PFC power supply.
  • the mode of determining the operating mode of the power factor correction circuit 10 is reliable, and the result of calculating the instantaneous value of the input AC voltage of the PFC power source is accurate.
  • the RMS calculation module 400 is configured to calculate an RMS effective value of the PFC power source according to the input AC voltage peak value or the input AC voltage instantaneous value.
  • the AC voltage effective value of the PFC power source is calculated according to the input AC voltage peak value and the eighth preset formula; or the AC voltage effective value of the PFC power source is calculated according to the input AC voltage instantaneous value and the ninth preset formula.
  • Vac_rms is the AC voltage RMS value of the PFC power supply
  • Vac_peak is the AC voltage peak value of the power supply
  • sqrt(2) is the square root operation of the number "2”
  • Vac is the instantaneous value of the AC voltage of the power supply.
  • LPF (Vac ⁇ Vac) is a low-pass filtering operation on (Vac ⁇ Vac)
  • sqrt LPF (Vac ⁇ Vac)) is a pair ( LPF (Vac ⁇ Vac) ) Perform an square root operation.
  • the operation parameter acquisition module 100 acquires the current operating parameters of the PFC power supply.
  • the peak voltage acquisition module 200 controls the power factor correction circuit 10 of the PFC power supply to be turned off under the condition that the current operating parameter of the PFC power supply meets the power factor correction circuit 10 of the PFC power supply, and the PFC power supply is obtained according to the voltage across the electrolytic capacitor C.
  • the input AC voltage peak value; the instantaneous voltage acquisition module 300 controls the PFC power supply to be turned on when the current operating parameter of the PFC power supply meets the condition that the power factor correction circuit 10 of the PFC power supply is turned on, and acquires the PFC power supply according to the operation mode of the power factor correction circuit 10 The instantaneous value of the input AC voltage.
  • the effective value calculation module 400 calculates an AC voltage effective value of the PFC power source according to the input AC voltage peak value or the input AC voltage instantaneous value. Since the technical solution acquires the instantaneous value of the input AC voltage of the PFC power source according to the working mode of the power factor correction circuit. Therefore, the technical solution can avoid the interference of the current interruption mode to the AC voltage RMS acquisition result of the PFC power supply, and the technical solution of the present invention has the characteristics of high accuracy compared with the prior art.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant d'obtenir une valeur efficace d'une tension alternative d'une alimentation électrique de correction de facteur de puissance (PFC). Le procédé permettant d'obtenir une valeur efficace d'une tension alternative d'une alimentation électrique PFC comprend les étapes suivantes consistant : à acquérir des paramètres de fonctionnement réel d'une alimentation électrique PFC (S100) ; à commander, quand les paramètres de fonctionnement réel de l'alimentation électrique PFC satisfont une condition de désactivation d'un circuit de correction de facteur de puissance de l'alimentation électrique PFC, la désactivation du circuit de correction de facteur de puissance de l'alimentation électrique PFC, et à obtenir, en fonction de la tension de deux extrémités d'un condensateur électrolytique, une valeur maximale d'une tension alternative d'entrée de l'alimentation électrique PFC (S200) ; à commander, quand les paramètres de fonctionnement réel de l'alimentation électrique PFC satisfont une condition d'activation du circuit de correction de facteur de puissance de l'alimentation électrique PFC, l'activation du circuit de correction de facteur de puissance, et à obtenir, en fonction d'un mode de fonctionnement du circuit de correction de facteur de puissance, une valeur instantanée de la tension alternative d'entrée de l'alimentation électrique PFC (S300) ; à calculer, en fonction de la valeur maximale de la tension alternative d'entrée ou de la valeur instantanée de la tension alternative d'entrée, une valeur efficace de la tension alternative de l'alimentation électrique PFC (S400). Le procédé et le dispositif présentent la caractéristique d'une précision élevée.
PCT/CN2017/094173 2017-06-21 2017-07-24 Procédé et dispositif permettant d'obtenir une valeur efficace d'une tension alternative d'une alimentation électrique pfc WO2018232818A1 (fr)

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