CN114362506B - Power factor correction circuit - Google Patents
Power factor correction circuit Download PDFInfo
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- CN114362506B CN114362506B CN202111571453.6A CN202111571453A CN114362506B CN 114362506 B CN114362506 B CN 114362506B CN 202111571453 A CN202111571453 A CN 202111571453A CN 114362506 B CN114362506 B CN 114362506B
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- 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
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- 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
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Abstract
The invention relates to the technical field of electronics, and provides a power factor correction circuit which comprises a Boost power factor correction module and a control module; the control module is used for generating a control signal for controlling the Boost power factor correction module according to an input alternating current signal, the Boost power factor correction module changes the input current of the power factor correction circuit according to the control signal so that the input current lags behind the alternating current input signal, the alternating current input signal is the input voltage of the power factor correction circuit, namely, the input current of the power factor correction circuit lags behind the input voltage, and the input equivalent impedance of the power factor correction circuit is inductive. The invention realizes the power factor correction and simultaneously makes the input equivalent impedance of the power factor correction circuit be inductive so as to prevent resonance with inductive devices in a power supply system.
Description
Technical Field
The present invention relates to the field of electronic technology, and in particular, to a power factor correction circuit.
Background
In an electronic equipment system powered by alternating current, power factor correction is often required to be performed on a power supply to reduce harmonic current caused by rectification of a diode rectifier bridge, and the harmonic current generally generates radiation and conductive electromagnetic interference, pollutes a power grid, affects normal operation of other power supply equipment, reduces reactive power components, and improves the utilization rate of the power supply.
The traditional power factor correction technology is divided into an active type and a passive type, the passive correction circuit is usually composed of high-capacity passive devices such as an inductor and a capacitor, the size and the weight of the passive correction circuit are large, the corrected power factor is usually between 0.7 and 0.8, the power factor is gradually eliminated at present, and the active power factor correction technology is replaced, and a power conversion circuit is added between a rectifier bridge and a capacitor filter, so that the corrected power factor value is close to 1. The power factor correction technology is the mainstream at present because of the characteristics of small volume, light weight, high efficiency, good effect and the like.
In the current commonly used active power factor correction technology, a Boost topology power factor correction circuit is generally used, and the principle of the Boost topology power factor correction circuit is that an inductance current is compared with an input sinusoidal voltage, when the inductance current exceeds the voltage of the sinusoidal envelope of the input voltage, a switching tube is closed to enable the inductance current to fall, when the inductance current is smaller than the voltage of the sinusoidal envelope of the input voltage, the switching tube is opened to enable the inductance current to rise, the final inductance current can form a steamed bread wave envelope current along with the waveform of the input sinusoidal voltage, and then the sinusoidal envelope current is fed back to the input current after rectification processing, so that the input current becomes the sinusoidal envelope current, and the purposes of correcting the power factor and reducing harmonic current are achieved. Since the input voltage is a modulation control reference of the input current, the Boost topology power factor correction circuit must keep the current consistent with the voltage in phase, and in practical situations, the Boost topology power factor correction circuit generally corrects the power factor to between 0.9 and 1.
When the phase of the input current of the power factor correction circuit leads the input voltage, the input equivalent impedance of the power factor correction circuit is capacitive, and the whole power factor correction circuit can be equivalent to a capacitive device.
The input equivalent impedance of the power factor correction circuit formed by using the passive correction circuit and the Boost power factor correction circuit is always capacitive, however, in some cases, an inductive device is used in the power supply system, and at the moment, when the Boost power factor correction circuit or the passive correction circuit is used as the power factor correction circuit, resonance occurs with the inductive device in the power supply system, so that resonance current is generated, and the stability of the power supply system is affected.
In view of this, overcoming the drawbacks of the prior art is a problem to be solved in the art.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is that the input equivalent impedance in the current power factor correction circuit technology is capacitive and is easy to generate resonance with an inductive device in a power supply system.
The invention provides a power factor correction circuit, wherein a Boost power factor correction module and a control module share one input end, the control module is used for generating a control signal for controlling the Boost power factor correction module according to an input alternating current signal, the Boost power factor correction module changes the input current of the power factor correction circuit according to the control signal, so that the input current lags behind the alternating current input signal, the alternating current input signal is the input voltage of the power factor correction circuit, namely, the input current of the power factor correction circuit lags behind the input voltage, and the input equivalent impedance of the power factor correction circuit is inductive.
Preferably, the control module specifically includes:
the device comprises a phase shifting unit, a voltage adjusting unit, a multiplier-divider unit, a current sampling adjusting unit and a driving unit;
the phase shifting unit is used for generating a current signal lagging behind the alternating current input signal according to the alternating current input signal, the current signal lagging behind the alternating current input signal is used for shifting the phase of the inductance current of the Boost power factor correction module, the voltage adjusting unit is used for providing a negative feedback signal according to a direct current voltage signal output by the Boost power factor correction module so as to enable the voltage of the direct current voltage signal to be stable, the multiplication and division unit is used for generating a steamed bread wave control signal according to the current signal and the negative feedback signal, the current sampling and adjusting unit is used for collecting the inductance current sampling signal in the Boost power factor correction module and comparing the inductance current sampling signal with a sawtooth wave signal to generate a pulse signal, the driving unit amplifies the pulse signal to form a control signal and inputs the control signal to a control end of the Boost power factor correction module so as to control the inductance current lagging behind the alternating current input signal and generate the input current lagging behind the alternating current input signal according to the inductance current.
Preferably, the phase shift unit specifically includes: the circuit comprises a resistor R1, a capacitor C1 and a first rectifier bridge circuit, wherein the resistor R1 and the capacitor C1 form a phase shifting circuit, the phase shifting circuit is used for carrying out hysteresis processing on an alternating current input signal and then inputting the alternating current input signal into the first rectifier bridge circuit, the first rectifier bridge circuit is used for outputting a current signal which is hysteresis on the alternating current input signal, and the current signal presents a steamed bread wave waveform which is hysteresis on the alternating current input signal.
Preferably, the voltage adjusting unit specifically includes: the voltage dividing circuit is composed of a resistor R2, a resistor R3, a first PID regulating circuit, a voltage source V1 and an amplifier X1, wherein the resistor R2 and the resistor R3 are used for dividing an input voltage signal and then inputting the divided voltage signal into a negative input end of the amplifier X1, the input end of the first PID regulating circuit is connected with an output end of the amplifier X1, the output end of the first PID regulating circuit is connected with the negative input end of the amplifier X1 and used for improving the response speed of the amplifier X1, and the amplifier X1 is used for comparing the input of the negative input end with the voltage of the voltage source V1 and then outputting the negative feedback signal.
Preferably, the multiplier-divider unit specifically includes: the current sensor H1 is used for collecting and amplifying the current signal and inputting the amplified current signal to a second input end of the multiplication divider, the current-voltage converter F1 is used for converting the current signal into a voltage signal and inputting the voltage signal to a third input end and a fourth input end of the multiplication divider, a first input end of the multiplication divider is connected with an output end of the voltage adjusting unit, and the multiplication divider generates the steamed bread wave control signal lagging behind the alternating current input signal according to the input of the first input end, the input of the second input end, the input of the third input end and the input of the fourth input end.
Preferably, the current sampling adjustment unit specifically includes: the system comprises a current sensor H2, an amplifier X2, a second PID regulating circuit, a sawtooth wave signal source V2 and a comparator U1, wherein the current sensor H2 is used for collecting an inductance current sampling signal in a Boost power factor correction module and amplifying the inductance current sampling signal, the inductance current sampling signal is overlapped with a steamed bread wave control signal to be output to a negative input end of the amplifier X2, the input end of the second PID regulating circuit is connected with an output end of the amplifier X2, the output end of the second PID regulating circuit is connected with the input end of the amplifier X2 and used for improving response speed of the amplifier X2, the amplifier X2 gains an input signal of the negative input end to generate a steamed bread wave control signal after gain, the steamed bread wave control signal after gain is input to a negative input end of the comparator U1, and the comparator U1 is used for comparing the steamed bread wave control signal after gain with the sawtooth wave signal output by the sawtooth wave signal source V2 and outputting the pulse signal.
Preferably, the driving unit specifically includes: the push-pull driving amplifying circuit, the voltage source V3 and the voltage source V4 are used for providing working voltage for the push-pull driving amplifying circuit, and the push-pull driving amplifying circuit is used for amplifying the power of the pulse signal output by the current sampling adjusting circuit into a control signal so as to enhance the driving capability.
Preferably, the Boost power factor correction module specifically includes: the control signal is input to the grid electrode of the MOS tube Q1, the on and off of the MOS tube Q1 are controlled, the inductance current in the Boost power factor correction module is controlled through controlling the MOS tube Q1, so that the inductance current presents steamed bread wave envelope current lagging behind the alternating current input signal, and the input current lagging behind the alternating current input signal is generated according to the inductance current.
Preferably, the multiplier-divider generates the steamed bread wave control signal lagging the ac input signal according to the input of the first input terminal, the input of the second input terminal, the input of the third input terminal and the input of the fourth input terminal, and specifically includes:
the third input end and the fourth input end are the same in input and are both first voltage signals, and the multiplier-divider multiplies the negative feedback signal input from the first input end by the current signal input from the second input end and then divides the current signal by the square of the first voltage signal to obtain the steamed bread wave control signal.
Preferably, the phase angle of the current signal output by the phase shifting unit is-arctan (ωrc), where R is the resistance value of the resistor R1, C is the capacitance value of the capacitor C1, and ω is the angular frequency of the ac input signal, and the magnitude of the output equivalent impedance in the pfc circuit is changed by changing the phase angle.
Compared with the prior art, the embodiment of the invention has the beneficial effects that: the invention controls the inductance current and the output direct-current voltage signal in the Boost power factor correction module through the Boost power factor correction module and the control module, thereby realizing the power factor correction and simultaneously enabling the input equivalent impedance of the power factor correction circuit to be inductive so as to prevent resonance with inductive devices in a power supply system.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a power factor correction circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a power factor correction circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a phase shifting unit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a voltage adjusting unit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a multiplier-divider unit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a current sampling adjustment unit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a driving unit according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a Boost PFC module according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a power factor correction circuit according to an embodiment of the present invention;
fig. 10 is a waveform diagram of an ac input signal of a pfc circuit according to an embodiment of the present invention;
fig. 11 is a waveform diagram of a current signal of a pfc circuit according to an embodiment of the present invention;
fig. 12 is a waveform diagram of a control signal of a pfc circuit according to an embodiment of the present invention;
fig. 13 is a waveform diagram of a current of a MOS transistor in a Boost power factor correction module according to an embodiment of the present invention;
fig. 14 is a waveform diagram of an input current of a pfc circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1:
the embodiment 1 of the invention provides a power factor correction circuit, which is shown in fig. 1 and comprises a Boost power factor correction module and a control module; the control module is used for generating a control signal for controlling the Boost power factor correction module according to an input alternating current signal, the Boost power factor correction module changes the input current of the power factor correction circuit according to the control signal so that the input current lags behind the alternating current input signal, the alternating current input signal is the input voltage of the power factor correction circuit, namely, the input current of the power factor correction circuit lags behind the input voltage, and the input equivalent impedance of the power factor correction circuit is inductive.
The working principle of the Boost power factor correction module is that the inductance current is compared with an alternating current input signal, when the inductance current exceeds the voltage of the alternating current input signal, a switching tube is closed, the inductance current is reduced, when the inductance current is smaller than the voltage of the alternating current input signal, the switching tube is opened, the inductance current is increased, the inductance current finally follows the sine waveform of the alternating current input signal to form a steamed bread wave envelope current, the inductance current is rectified to obtain the input current, and the input current is the sine envelope current which follows the sine waveform of the alternating current input signal, so that the purposes of correcting the power factor and reducing the harmonic current are achieved.
The embodiment of the invention controls the process of correcting the power factor by the Boost power factor correction module by introducing the control module, and specifically comprises the following steps: the control module changes the inductance current in each switching period of the switching tube of the Boost power factor correction module by controlling the switching tube of the Boost power factor correction module, so that the overall inductance current lags behind an alternating current input signal, and the finally obtained inductance current is a steamed bread wave envelope current lagging behind the alternating current input signal, thereby the input current generated according to the inductance current presents a sine envelope current lagging behind the alternating current input signal.
The input equivalent impedance of the power correction circuit is an inductance embodied as an input current in the power correction circuit lagging an input voltage, i.e. the input signal lagging an ac input signal.
According to the embodiment of the invention, the control module is introduced to change the input current of the power factor correction circuit, so that the aim of representing the inductance of the input equivalent impedance is fulfilled.
In this embodiment, as shown in fig. 2, the control module specifically includes a phase shifting unit, a voltage adjusting unit, a multiplier-divider unit, a current sampling adjusting unit, and a driving unit;
the phase shifting unit is used for generating a current signal lagging behind the alternating current input signal according to the alternating current input signal, the current signal lagging behind the alternating current input signal is used for shifting the phase of the inductance current of the Boost power factor correction module, the voltage adjusting unit is used for providing a negative feedback signal according to a direct current voltage signal output by the Boost power factor correction module so as to enable the voltage of the direct current voltage signal to be stable, the multiplication and division unit is used for generating a steamed bread wave control signal according to the current signal and the negative feedback signal, the current sampling and adjusting unit is used for collecting the inductance current sampling signal in the Boost power factor correction module and comparing the inductance current sampling signal with a sawtooth wave signal to generate a pulse signal, the driving unit amplifies the pulse signal to form a control signal and inputs the control signal to a control end of the Boost power factor correction module so as to control the inductance current lagging behind the alternating current input signal and generate the input current lagging behind the alternating current input signal according to the inductance current.
Specifically, the input end of the phase shifting unit is used as a first input end of the control module and is used for inputting an alternating current input signal, the input end of the voltage adjusting unit is used as a second input end of the control module and is used for inputting a direct current voltage signal, the output end of the phase shifting unit is connected with the first input end of the multiplication and division unit, the output end of the voltage adjusting unit is connected with the second input end of the multiplication and division unit, the output end of the multiplication and division unit is connected with the first input end of the current sampling adjusting unit, the second input end of the current sampling adjusting unit is used as a third input end of the control module, the third input end is connected in series in the Boost power factor correction module and is used for collecting an inductance current sampling signal of the Boost power factor correction module, and the output end of the current sampling adjusting circuit is connected with the input end of the driving unit and is used as the output end of the control module and outputs a control signal.
In this embodiment, as shown in fig. 3, the phase shift unit specifically includes: the circuit comprises a resistor R1, a capacitor C1 and a first rectifier bridge circuit, wherein the resistor R1 and the capacitor C1 form a phase shifting circuit, the phase shifting circuit is used for carrying out hysteresis processing on an alternating current input signal and then inputting the alternating current input signal into the first rectifier bridge circuit, the first rectifier bridge circuit is used for outputting a current signal which is hysteresis on the alternating current input signal, and the current signal presents a steamed bread wave waveform which is hysteresis on the alternating current input signal.
The phase shifting unit further comprises a resistor R4, wherein an RC first-order dynamic circuit is formed by connecting the resistor R1 and a capacitor C1 in series and used as a phase shifting circuit, hysteresis of an alternating current input signal is achieved through charging and discharging of the capacitor C1, the discharging end of the first-order dynamic circuit, namely, two ends of the capacitor C1 are respectively connected to different positions in a first rectifier bridge circuit, the first rectifier bridge circuit is formed by connecting four diodes D1, a diode D2, a diode D3 and a diode D4, wherein the cathode of the diode D1 is connected with the cathode of the diode D3 and connected to one end of the resistor R4 together, the anode of the diode D1 is connected with the cathode of the diode D2 together, the anode of the diode D2 is connected with the anode of the diode D4 together, the cathode of the diode D4 is connected with the anode of the diode D3, one end of the capacitor C1 is connected to the anode of the diode D1, the other end of the capacitor C1 is connected to the anode of the diode D3, and the hysteresis wave which is the alternating current wave arriving at the resistor R4 is the input wave, namely, the hysteresis wave arriving at the input wave is the input wave of the dynamic wave R4 is the hysteresis wave, and the hysteresis wave is the hysteresis wave of the input wave R4.
The phase angle of the current signal output by the phase shifting unit is-arctan (ωRC) compared with the phase angle of the alternating current input signal, wherein R is the resistance value of a resistor R1, C is the capacitance value of a capacitor C1, ω is the angular frequency of the alternating current input signal, and the magnitude of the output equivalent impedance in the power factor correction circuit is changed by changing the phase angle.
Changing the phase angle changes the magnitude of the output equivalent impedance in the power factor correction circuit by changing the phase angle to change the phase angle of the inductor current to lag behind the phase of the ac input signal.
In this embodiment, as shown in fig. 4, the voltage adjustment unit specifically includes:
the voltage dividing circuit is composed of a resistor R2, a resistor R3, a first PID regulating circuit, a voltage source V1 and an amplifier X1, wherein the resistor R2 and the resistor R3 are used for dividing an input voltage signal and then inputting the divided voltage signal into a negative input end of the amplifier X1, the input end of the first PID regulating circuit is connected with an output end of the amplifier X1, the output end of the first PID regulating circuit is connected with the negative input end of the amplifier X1 and used for improving the response speed of the amplifier X1, and the amplifier X1 is used for comparing the input of the negative input end with the voltage of the voltage source V1 and then outputting the negative feedback signal.
The resistor R2 is connected with the resistor R3 in series, the voltage separated from the resistor R3 is connected to the negative input end of the amplifier X1, the first PID regulating circuit comprises a resistor R5, a capacitor C3 and a capacitor C4, wherein the resistor R5 is connected with the capacitor C3 in series, a series circuit formed by the resistor R5 and the capacitor C3 is connected with the capacitor C4 in parallel, two ends of the capacitor C4 are respectively connected to the negative input end and the output end of the amplifier X1, the voltage regulating unit further comprises a voltage source V5, the positive electrode of the voltage source V5 is connected with the output end of the amplifier, and the negative electrode of the voltage source V5 is used as the output end of the voltage regulating unit and is used for outputting a negative feedback signal after adding a bias voltage to a voltage signal outputted by the amplifier X1.
In this embodiment, as shown in fig. 5, the multiplier-divider unit specifically includes:
the current sensor H1 is used for collecting and amplifying the current signal and inputting the amplified current signal to a second input end of the multiplication divider, the current-voltage converter F1 is used for converting the current signal into a voltage signal and inputting the voltage signal to a third input end and a fourth input end of the multiplication divider, a first input end of the multiplication divider is connected with an output end of the voltage adjusting unit, and the multiplication divider generates the steamed bread wave control signal lagging behind the alternating current input signal according to the input of the first input end, the input of the second input end, the input of the third input end and the input of the fourth input end.
The current signal enters the current-voltage converter F1 after passing through the measuring end of the current sensor H1, the negative end of the current sensor H1 is connected with the second port of the multiplier-divider, and the output end of the current-voltage converter F1 is connected with the third port and the fourth port of the multiplier-divider. The multiplier-divider further comprises a resistor R6, a capacitor C5, a diode D10 and a voltage source V7, wherein the resistor R6 is connected with the capacitor C5 in parallel, one end of the resistor R6 and one end of the capacitor C5 are connected with the output end of the current-voltage converter F1, and the other end of the resistor R6 and the other end of the capacitor C5 are grounded together. The voltage source V7 is used for providing working voltage for the multiplier-divider, the cathode of the diode D10 is connected with the output end of the multiplier-divider, and the anode is grounded.
The first input end, the second input end, the third input end and the fourth input end of the multiplication divider are shown in fig. 5 as N1, N2, D1 and D2 respectively, and the operation rule of the multiplication divider is as follows:
N1×N2÷(D1×D2)
from the operation rule, the multiplier-divider generates a steamed bread wave control signal lagging behind the alternating current input signal according to the input of the first input end, the input of the second input end, the input of the third input end and the input of the fourth input end, wherein the steamed bread wave control signal is specifically as follows:
the third input end and the fourth input end are the same in input and are both first voltage signals, and the multiplier-divider multiplies the negative feedback signal input from the first input end by the current signal input from the second input end and then divides the current signal by the square of the first voltage signal to obtain the steamed bread wave control signal.
The first voltage signal is a voltage signal output by the current-voltage converter F1.
In this embodiment, as shown in fig. 6, the current sampling adjustment unit specifically includes:
the system comprises a current sensor H2, an amplifier X2, a second PID regulating circuit, a sawtooth wave signal source V2 and a comparator U1, wherein the current sensor H2 is used for collecting an inductance current sampling signal in a Boost power factor correction module and amplifying the inductance current sampling signal, the inductance current sampling signal is overlapped with a steamed bread wave control signal to be output to a negative input end of the amplifier X2, the input end of the second PID regulating circuit is connected with an output end of the amplifier X2, the output end of the second PID regulating circuit is connected with the input end of the amplifier X2 and used for improving response speed of the amplifier X2, the amplifier X2 gains an input signal of the negative input end to generate a steamed bread wave control signal after gain, the steamed bread wave control signal after gain is input to a negative input end of the comparator U1, and the comparator U1 is used for comparing the steamed bread wave control signal after gain with the sawtooth wave signal output by the sawtooth wave signal source V2 and outputting the pulse signal.
The inductance current of the Boost power factor correction module flows into the measuring end of the current sensor H2 as an inductance current sampling signal, the positive end of the current sensor H2 is connected with the amplifier X2, the output end of the amplifier X2 is connected with the negative input end of the comparator U1, and the positive end of the comparator U1 is connected with the voltage source V2. The second PID regulating circuit comprises a resistor R7, a capacitor C6 and a capacitor C7, wherein the resistor R7 is connected with the capacitor C6 in series, a series circuit formed by the resistor R7 and the capacitor C6 is connected with the capacitor C7 in parallel, and two ends of the capacitor C7 are respectively connected to the negative input end and the output end of the amplifier X2.
In this embodiment, as shown in fig. 7, the driving unit specifically includes:
the push-pull driving amplifying circuit, the voltage source V3 and the voltage source V4 are used for providing working voltage for the push-pull driving amplifying circuit, and the push-pull driving amplifying circuit is used for amplifying the power of the pulse signal output by the current sampling adjusting circuit into a control signal so as to enhance the driving capability.
The amplification factor of the push-pull driving amplification circuit is designed according to the power requirement of the control end of the Boost power factor correction module.
In this embodiment, as shown in fig. 8, the Boost power factor correction module specifically includes:
the control signal is input to the grid electrode of the MOS tube Q1, the on and off of the MOS tube Q1 are controlled, the inductance current in the Boost power factor correction module is controlled through controlling the MOS tube Q1, so that the inductance current presents steamed bread wave envelope current lagging behind the alternating current input signal, and the input current lagging behind the alternating current input signal is generated according to the inductance current.
The second rectifier bridge circuit is formed by connecting four diodes D5, D6, D7 and D8, wherein the cathode of the diode D5 is connected with the cathode of the diode D7, the anode of the diode D5 is connected with the cathode of the diode D6, the anode of the diode D6 is connected with the anode of the diode D8, the cathode of the diode D8 is connected with the anode of the diode D7, one end of the inductor L1 is connected to the anode of the diode D7, the other end of the inductor L1 is connected with the anode of the diode D9, the anode of the diode is connected with the drain of the MOS, i.e., the D pole in fig. 8, the source of the MOS is connected with the anode of the diode D8 together, the control end of the Boost power factor correction module is the gate of the MOS, i.e., the G pole in fig. 8, the cathode of the diode D8 is connected with the capacitor C10, and the other end of the capacitor is connected with the capacitor C10, i.e., the voltage of the capacitor is connected with the capacitor 10. The current flowing through the inductor L1 is the inductor current and is also the input current in the power factor correction circuit, one end of the alternating current input signal is connected with the anode of the diode D5, the other end of the alternating current input signal is connected with the anode of the diode D7, and the alternating current input signal is also the input voltage in the power factor correction circuit.
According to the embodiment, after the alternating current input signal is subjected to hysteresis processing, the alternating current input signal, the negative feedback signal and the inductive current are modulated into control signals, the control signals are used for controlling the on and off of MOS (metal oxide semiconductor) tubes in the Boost power factor correction module, so that the inductive current in the Boost power factor correction module is controlled to be steamed bread wave envelope current which is delayed to the alternating current input signal, the input current which is delayed to the alternating current input signal is generated according to the inductive current, and the input current is sine envelope current which is delayed to the alternating current input signal. Therefore, the input equivalent impedance of the power factor correction circuit presents inductance, and circuit breakdown caused by resonance with an inductive device when the inductive device exists in a power supply system is prevented.
The terms "first," "second," and "third" herein have no special definition, but are used for convenience in describing various individual ones of a class of objects, and should not be construed as being sequential or otherwise provided with a special definition.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Example 2:
the invention is based on the power factor correction circuit described in embodiment 1, and combines specific application scenes, and the implementation process in the characteristic scene of the invention is described by means of technical expression in the relevant scenes.
In an on-board power supply system, because the generator presents an inductance, the latter electric equipment is required to not present a capacitance, otherwise, the power grid has an LC resonance point, and the risk of breakdown of the power grid caused by resonance exists. In this case, it is often required that the input current of the pfc circuit lags behind the input voltage, so that the input equivalent impedance is inductive, avoiding the generation of resonance points.
For the above scenario, the present embodiment provides a power factor correction circuit as shown in fig. 9 to implement power factor correction on an on-board power supply system, where one end of a capacitor C8 in the Boost power factor correction module is connected to an inductor L1, and one end of the capacitor C8 is connected to an anode of a diode D8, so as to suppress noise, and an AC input AC1 of the Boost power factor correction module is in phase with an AC input AC2 in the sampling unit, and has the same frequency and the same magnitude, and outputs of AC1 and AC2 are the AC input signals.
The waveform of the alternating current input signal input from the input end of the Boost power factor correction module and the moving unit is shown in fig. 10, the phase of the alternating current input signal is lagged into a current signal after being processed by the phase shifting unit, the current signal is a steamed bread wave waveform shown in fig. 11, the frequency of the current signal is twice the frequency of the alternating current input signal, in the multiplier-divider unit, the current signal is converted into a voltage signal in a one-to-one mode through a current-voltage sensor F1 and is input to the D1 end and the D2 end of the multiplier-divider, the N2 end is input with the steamed bread wave signal acquired and amplified through the current sensor, meanwhile, the N1 end of the multiplier-divider is connected with the output end of the voltage regulating unit, the voltage regulating unit is connected with the output voltage signal of the Boost power factor correction module, the method can generate corresponding negative feedback signals according to the output voltage signals for keeping the stability of the output voltage signals, the negative feedback signals, the current signals and the voltage signals converted from the current signals are modulated by a multiplier-divider to become steamed bread wave control signals, then the inductance current sampling signals of the Boost power factor correction module are acquired by a current sensor H2 of a current acquisition control unit, the inductance current sampling signals and the steamed bread wave control signals are amplified and modulated by an amplifier X2 to form new steamed bread wave control signals, the frequency of sawtooth waves generated by a sawtooth wave signal source V2 is the frequency for controlling the on and off of MOS tubes in the Boost power factor correction module, then the new steamed bread wave control signals are compared with the sawtooth waves by a comparator U1 in the current acquisition control unit to generate pulse signals, the pulse signal is amplified by the driving unit to drive power and becomes a control signal shown in fig. 12, the control signal is used for controlling the on and off of the MOS tube, the controlled MOS tube current is shown in fig. 13, the MOS tube current is used for controlling the inductive current in the Boost power factor correction module, so that the inductive current presents a steamed bread wave envelope current lagging behind the alternating current input signal, the inductive current becomes a sine envelope current lagging behind the alternating current input signal after passing through the rectifier bridge circuit of the Boost power factor correction module, the sine envelope current is the input current of the power factor correction circuit, the alternating current input signal is the input voltage of the power factor correction circuit, the input current of the power factor correction circuit lags behind the input voltage, and the input equivalent impedance of the whole power factor correction circuit presents inductance.
And the Boost power factor correction module is used for enabling the voltage of the output voltage signal to rise to about 390V. The voltage adjusting unit, the multiplier-divider unit and the current sampling adjusting unit form a voltage negative feedback loop of the whole circuit, the duty ratio of the control signal can be changed by changing a negative feedback signal output by the voltage adjusting unit or a sawtooth wave signal output by a sawtooth wave signal source V2 in the current sampling adjusting unit, and the voltage value of the output voltage signal is not changed along with the change of current in a device by changing the duty ratio, namely the direct current output is kept. Meanwhile, the moving unit, the multiplication and division unit and the current acquisition and adjustment unit form a current control loop of the whole circuit, so that the Boost power factor correction module tracks the input alternating current signal after hysteresis processing, and the input current in the power factor correction circuit presents a delayed sinusoidal envelope current.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. A power factor correction circuit, comprising:
a Boost power factor correction module and a control module; the control module is used for generating a control signal for controlling the Boost power factor correction module according to an input alternating current input signal, the Boost power factor correction module changes the input current of the power factor correction circuit according to the control signal so that the input current lags behind the alternating current input signal, the alternating current input signal is the input voltage of the power factor correction circuit, namely, the input current of the power factor correction circuit lags behind the input voltage, and the input equivalent impedance of the power factor correction circuit is inductive;
the control module specifically comprises: the device comprises a phase shifting unit, a voltage adjusting unit, a multiplier-divider unit, a current sampling adjusting unit and a driving unit;
the phase shifting unit is used for generating a current signal lagging behind the alternating current input signal according to the alternating current input signal, the current signal lagging behind the alternating current input signal is used for shifting the phase of the inductance current of the Boost power factor correction module, the voltage adjusting unit is used for providing a negative feedback signal according to a direct current voltage signal output by the Boost power factor correction module so as to enable the voltage of the direct current voltage signal to be stable, the multiplication and division unit is used for generating a steamed bread wave control signal according to the current signal and the negative feedback signal, the current sampling and adjusting unit is used for collecting the inductance current sampling signal in the Boost power factor correction module and comparing the inductance current sampling signal with a sawtooth wave signal to generate a pulse signal, the driving unit amplifies the pulse signal to form a control signal and inputs the control signal to a control end of the Boost power factor correction module so as to control the inductance current lagging behind the alternating current input signal and generate the input current lagging behind the alternating current input signal according to the inductance current.
2. The power factor correction circuit of claim 1, wherein the phase shift unit specifically comprises:
the circuit comprises a resistor R1, a capacitor C1 and a first rectifier bridge circuit, wherein the resistor R1 and the capacitor C1 form a phase shifting circuit, the phase shifting circuit is used for carrying out hysteresis processing on an alternating current input signal and then inputting the alternating current input signal into the first rectifier bridge circuit, the first rectifier bridge circuit is used for outputting a current signal which is hysteresis on the alternating current input signal, and the current signal presents a steamed bread wave waveform which is hysteresis on the alternating current input signal.
3. The power factor correction circuit according to claim 1, wherein the voltage adjustment unit specifically includes:
the voltage dividing circuit is composed of a resistor R2, a resistor R3, a first PID regulating circuit, a voltage source V1 and an amplifier X1, wherein the resistor R2 and the resistor R3 are used for dividing an input voltage signal and then inputting the divided voltage signal into a negative input end of the amplifier X1, the input end of the first PID regulating circuit is connected with an output end of the amplifier X1, the output end of the first PID regulating circuit is connected with the negative input end of the amplifier X1 and used for improving the response speed of the amplifier X1, and the amplifier X1 is used for comparing the input of the negative input end with the voltage of the voltage source V1 and then outputting the negative feedback signal.
4. The power factor correction circuit of claim 1, wherein the multiplier-divider unit specifically comprises:
the current sensor H1 is used for collecting and amplifying the current signal and inputting the amplified current signal to a second input end of the multiplication divider, the current-voltage converter F1 is used for converting the current signal into a voltage signal and inputting the voltage signal to a third input end and a fourth input end of the multiplication divider, a first input end of the multiplication divider is connected with an output end of the voltage adjusting unit, and the multiplication divider generates the steamed bread wave control signal lagging behind the alternating current input signal according to the input of the first input end, the input of the second input end, the input of the third input end and the input of the fourth input end.
5. The power factor correction circuit according to claim 1, wherein the current sampling adjustment unit specifically comprises:
the system comprises a current sensor H2, an amplifier X2, a second PID regulating circuit, a sawtooth wave signal source V2 and a comparator U1, wherein the current sensor H2 is used for collecting an inductance current sampling signal in a Boost power factor correction module and amplifying the inductance current sampling signal, the inductance current sampling signal is overlapped with a steamed bread wave control signal to be output to a negative input end of the amplifier X2, the input end of the second PID regulating circuit is connected with an output end of the amplifier X2, the output end of the second PID regulating circuit is connected with the input end of the amplifier X2 and used for improving response speed of the amplifier X2, the amplifier X2 gains an input signal of the negative input end to generate a steamed bread wave control signal after gain, the steamed bread wave control signal after gain is input to a negative input end of the comparator U1, and the comparator U1 is used for comparing the steamed bread wave control signal after gain with the sawtooth wave signal output by the sawtooth wave signal source V2 and outputting the pulse signal.
6. The power factor correction circuit according to claim 1, wherein the driving unit specifically comprises:
the push-pull driving amplifying circuit, the voltage source V3 and the voltage source V4 are used for providing working voltage for the push-pull driving amplifying circuit, and the push-pull driving amplifying circuit is used for amplifying the power of the pulse signal output by the current sampling adjusting circuit into a control signal so as to enhance the driving capability.
7. The power factor correction circuit of claim 1, wherein the Boost power factor correction module specifically comprises:
the control signal is input to the grid electrode of the MOS tube Q1, the on and off of the MOS tube Q1 are controlled, the inductance current in the Boost power factor correction module is controlled through controlling the MOS tube Q1, so that the inductance current presents steamed bread wave envelope current lagging behind the alternating current input signal, and the input current lagging behind the alternating current input signal is generated according to the inductance current.
8. The pfc circuit of claim 4 wherein the multiplier-divider generates the steamed bread-roll control signal that lags the ac input signal based on the input at the first input terminal, the input at the second input terminal, the input at the third input terminal, and the input at the fourth input terminal, comprising:
the third input end and the fourth input end are the same in input and are both first voltage signals, and the multiplier-divider multiplies the negative feedback signal input from the first input end by the current signal input from the second input end and then divides the current signal by the square of the first voltage signal to obtain the steamed bread wave control signal.
9. The pfc circuit of claim 2, wherein a phase angle of the current signal output by the phase shift unit is-arctan (ωrc) with respect to the ac input signal, wherein R is a resistance value of a resistor R1, C is a capacitance value of a capacitor C1, ω is an angular frequency of the ac input signal, and a magnitude of an output equivalent impedance in the pfc circuit is changed by changing the phase angle.
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