CN114362506A - Power factor correction circuit - Google Patents
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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 Boost power factor correction module and the 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 to enable the input current to lag 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 inductive so as to prevent the resonance with an inductive device in a power supply system.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a power factor correction circuit.
Background
In an alternating current power supply electronic equipment system, 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, the harmonic current can generally generate radiation and conduct electromagnetic interference to pollute a power grid and influence normal operation of other power supply equipment, and meanwhile, reactive power components are reduced, and the utilization rate of the power supply is improved.
The traditional power factor correction technology is divided into an active power factor correction technology and a passive power factor correction technology, wherein the passive correction circuit is generally formed by large-capacity passive devices such as inductors and capacitors, the passive correction circuit is generally large in size and heavy in weight, the corrected power factor is generally between 0.7 and 0.8, and is gradually eliminated at present, and the active power factor correction technology is used as a substitute for the passive power factor correction technology, 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 device has become the mainstream power factor correction technology at present due to the characteristics of small volume, light weight, high efficiency, good effect and the like.
A Boost topological power factor correction circuit is generally used in the current commonly-used active power factor correction technology, the principle of the Boost topological power factor correction circuit is to compare inductive current with input sinusoidal voltage, when the inductive current exceeds the voltage of the input sinusoidal envelope, a switch tube is closed, the inductive current is reduced, when the inductive current is smaller than the voltage of the input sinusoidal envelope, the switch tube is opened, the inductive current is increased, finally, the inductive current can form steamed bread wave envelope current along with the waveform of the input sinusoidal voltage, and the sinusoidal envelope current is fed back to the input current after rectification processing, so that the input current becomes sinusoidal envelope current, and therefore the purposes of correcting the power factor and reducing the harmonic current are achieved. Because the input voltage is the modulation control reference of the input current, the current of the Boost topology power factor correction circuit is always consistent with the voltage in the phase, and the Boost power factor correction circuit generally corrects the power factor to be between 0.9 and 1 in the practical situation.
When the input current of the power factor correction circuit lags behind the input voltage, the input equivalent impedance of the power factor correction circuit is inductive, namely, the whole power factor correction circuit can be equivalent to an inductive device, and when the phase of the input current of the power factor correction circuit is ahead of the input voltage, the input equivalent impedance of the power factor correction circuit is capacitive, namely, 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 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 this time, the inductive device resonates with the inductive device in the power supply system when the Boost power factor correction circuit or the passive correction circuit is used as the power factor correction circuit, so that a resonant current is generated, and the stability of the power supply system is influenced.
In view of the above, overcoming the drawbacks of the prior art is an urgent problem in the art.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is that the input equivalent impedance in the current power factor correction circuit technology is capacitive, and easily generates 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 to enable the input current to lag 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 shift unit, a voltage adjusting unit, a multiplier-divider unit, a current sampling adjusting unit and a driving unit;
the device comprises a phase shifting unit, a voltage adjusting unit, a multiplier-divider unit, a current sampling adjusting unit and a driving unit, wherein 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 an inductive current of a 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 keep the voltage of the direct current voltage signal stable, the multiplier-divider unit is used for generating a steamed bread wave control signal according to the current signal and the negative feedback signal, the current sampling adjusting unit is used for collecting an inductive current sampling signal in the Boost power factor correction module, the steamed bread wave control signal is superposed with the inductive current sampling signal and then is compared with a sawtooth wave signal so as to generate a pulse signal, and the driving unit amplifies the pulse signal to form a control signal, and inputting the control signal to a control end of a Boost power factor correction module to control the Boost power factor correction module to enable the inductive current to lag behind the alternating current input signal, and generating the input current lagging behind the alternating current input signal according to the inductive 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 shift circuit, the phase shift circuit is used for inputting the alternating current input signal into the first rectifier bridge circuit after hysteresis processing, the first rectifier bridge circuit is used for outputting a current signal lagging behind the alternating current input signal, and the current signal presents a steamed bread wave waveform lagging behind the alternating current input signal.
Preferably, the voltage adjusting unit specifically includes: resistance R2, resistance R3, first PID regulating circuit, voltage source V1 and amplifier X1, resistance R2 and resistance R3 constitute bleeder circuit for inputing the negative input end of amplifier X1 after dividing the partial pressure of the voltage signal of input, the input of first PID regulating circuit is connected with amplifier X1's output, the output of first PID regulating circuit is connected with amplifier X1's negative input end for improve amplifier X1's response speed, amplifier X1 is used for with the negative input end the input and the voltage of voltage source V1 carry out the comparison after output the negative feedback signal.
Preferably, the multiplier-divider unit specifically includes: the current sensor H1, the current-voltage converter F1 and the multiplier-divider are used, the current sensor H1 is used for collecting and amplifying the current signal and inputting the current signal to the second input end of the multiplier-divider, the current-voltage converter F1 is used for converting the current signal into a voltage signal and inputting the voltage signal to the third input end and the fourth input end of the multiplier-divider, the first input end of the multiplier-divider is connected with the output end of the voltage adjusting unit, and the multiplier-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: a current sensor H2, an amplifier X2, a second PID adjusting circuit, a sawtooth wave signal source V2 and a comparator U1, the current sensor H2 is used for collecting an inductive current sampling signal in a Boost power factor correction module, amplifying the inductive current sampling signal, adding the inductive wave control signal and outputting the signal to the negative input end of an amplifier X2, the input end of the second PID regulating circuit is connected with the 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, for improving the response speed of the amplifier X2, the amplifier X2 gains the input signal of the negative input end to generate a gain steamed bun wave control signal, the gain steamed bun wave control signal is input to the negative input end of the comparator U1, the comparator U1 is used for comparing the gained steamed bun wave control signal with the sawtooth wave signal output by the sawtooth wave signal source V2 and then outputting the pulse signal.
Preferably, the driving unit specifically includes: the power amplifier comprises a push-pull driving amplifying circuit, a voltage source V3 and a voltage source V4, wherein the voltage source V3 and the voltage source V4 provide working voltage for the push-pull driving amplifying circuit, and the push-pull driving amplifying circuit is used for amplifying the power of a 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 a grid electrode of the MOS tube Q1, the on-off of the MOS tube Q1 is controlled, the inductor current in the Boost power factor correction module is controlled by controlling the MOS tube Q1, the inductor current is enabled to present a steamed bread wave envelope current lagging behind the alternating current input signal, and an input current lagging behind the alternating current input signal is generated according to the inductor current.
Preferably, the generating the steamed bread wave control signal lagging behind 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 includes:
the input of the third input end is the same as that of the fourth input end, the third input end and the fourth input end are both first voltage signals, and the multiplying and dividing device 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 signals to obtain the steamed bread wave control signal.
Preferably, a phase angle by which the current signal output by the phase shift unit lags behind the ac input signal is-arctan (ω RC), where R is a resistance value of a resistor R1, C is a capacitance value of a capacitor C1, and ω is an angular frequency of the ac input signal, and the magnitude of the output equivalent impedance in the power factor correction 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 inductive 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 achieving the purpose of 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 the resonance with an inductive device in a power supply system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
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 shift unit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a voltage adjustment unit according to an embodiment of the present invention;
FIG. 5 is a 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 power factor correction 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 an 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 power factor correction circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1:
The operating principle of the Boost power factor correction module is to compare an inductive current with an alternating current input signal, when the inductive current exceeds the voltage of the alternating current input signal, the switch tube is closed, the inductive current is reduced, when the inductive current is smaller than the voltage of the alternating current input signal, the switch tube is opened, the inductive current is increased, finally the inductive current can follow the sine waveform of the alternating current input signal to form a steamed bun wave envelope current, the inductive current is rectified to obtain an input current, and the input current is the sine envelope current formed by 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 of the Boost power factor correction module by introducing the control module, and specifically comprises the following steps: the control module changes the inductive current of the switching tube of the Boost power factor correction module in each switching period by controlling the switching tube of the Boost power factor correction module, so that the presented integral inductive current lags behind the alternating current input signal, and the finally obtained inductive current is the steamed bread wave envelope current lags behind the alternating current input signal, so that the input current generated according to the inductive current presents a sinusoidal envelope current lags behind the alternating current input signal.
The inductive input equivalent impedance of the power correction circuit is embodied in that the input current in the power correction circuit lags the input voltage, i.e. the input signal lags the ac input signal.
The embodiment of the invention changes the input current of the power factor correction circuit by introducing the control module, thereby realizing the purpose that the input equivalent impedance presents the sensitivity.
In this embodiment, the control module is shown in fig. 2, and specifically includes a phase shift unit, a voltage adjustment unit, a multiplier-divider unit, a current sampling adjustment unit, and a driving unit;
the device comprises a phase shifting unit, a voltage adjusting unit, a multiplier-divider unit, a current sampling adjusting unit and a driving unit, wherein 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 an inductive current of a 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 keep the voltage of the direct current voltage signal stable, the multiplier-divider unit is used for generating a steamed bread wave control signal according to the current signal and the negative feedback signal, the current sampling adjusting unit is used for collecting an inductive current sampling signal in the Boost power factor correction module, the steamed bread wave control signal is superposed with the inductive current sampling signal and then is compared with a sawtooth wave signal so as to generate a pulse signal, and the driving unit amplifies the pulse signal to form a control signal, and inputting the control signal to a control end of a Boost power factor correction module to control the Boost power factor correction module to enable the inductive current to lag behind the alternating current input signal, and generating the input current lagging behind the alternating current input signal according to the inductive current.
Specifically, the input end of the phase shift unit is used as the first input end of the control module for inputting an alternating current input signal, the input end of the voltage adjustment unit is used as the second input end of the control module for inputting a direct current voltage signal, the output end of the phase shift unit is connected with the first input end of the multiplier-divider unit, the output end of the voltage adjustment unit is connected with the second input end of the multiplier-divider unit, the output end of the multiplier-divider unit is connected with the first input end of the current sampling adjustment unit, the second input end of the current sampling adjustment unit is used as the third input end of the control module, the third input end is connected in series in the Boost power factor correction module for collecting an inductive current sampling signal of the Boost power factor correction module, and the output end of the current sampling adjustment circuit is connected with the input end of the driving unit, and the output end of the driving unit is used as the output end of the control module to output 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 shift circuit, the phase shift circuit is used for inputting the alternating current input signal into the first rectifier bridge circuit after hysteresis processing, the first rectifier bridge circuit is used for outputting a current signal lagging behind the alternating current input signal, and the current signal presents a steamed bread wave waveform lagging behind the alternating current input signal.
The phase shift unit further comprises a resistor R4, the resistor R1 and a capacitor C1 are connected in series to form an RC first-order dynamic circuit as a phase shift circuit, the delay of an alternating current input signal is realized through the 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 is connected to one end of a resistor R4, the anode of the diode D1 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the anode of the diode D4, 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 a diode D1, the other end of the capacitor C1 is connected to the anode of the diode D3, so that the waveform reaching the resistor R4 is m-shaped, namely a steamed bread wave, and the waveform reaching the resistor R4 is the steamed bread wave lagging behind the alternating current input signal due to the lagging function of the RC first-order dynamic circuit, and the steamed bread wave lagging behind the alternating current input signal is output as a current signal after being attenuated by the resistor R4.
The phase angle of the current signal output by the phase shift unit lagging behind the ac input signal is-arctan (ω RC), where R is the resistance of the resistor R1, C is the capacitance 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.
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 of the inductor current lagging the phase of the ac input signal.
In this embodiment, as shown in fig. 4, the voltage adjusting unit specifically includes:
resistance R2, resistance R3, first PID regulating circuit, voltage source V1 and amplifier X1, resistance R2 and resistance R3 constitute bleeder circuit for inputing the negative input end of amplifier X1 after dividing the partial pressure of the voltage signal of input, the input of first PID regulating circuit is connected with amplifier X1's output, the output of first PID regulating circuit is connected with amplifier X1's negative input end for improve amplifier X1's response speed, amplifier X1 is used for with the negative input end the input and the voltage of voltage source V1 carry out the comparison after output the negative feedback signal.
The resistor R2 and the resistor R3 are connected in series, the voltage obtained by dividing the resistor R3 is connected to the negative input end of the amplifier X1, the first PID adjusting circuit comprises a resistor R5, a capacitor C3 and a capacitor C4, wherein the resistor R5 is connected in series with the capacitor C3, a series circuit formed by the resistor R5 and the capacitor C3 is connected in parallel with the capacitor C4, two ends of the capacitor C4 are respectively connected to the negative input end and the output end of the amplifier X1, the voltage adjusting 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 adjusting unit is used for outputting a negative feedback signal after adding a bias voltage to the voltage signal output by the amplifier X1.
In this embodiment, as shown in fig. 5, the multiplier-divider unit specifically includes:
the current sensor H1, the current-voltage converter F1 and the multiplier-divider are used, the current sensor H1 is used for collecting and amplifying the current signal and inputting the current signal to the second input end of the multiplier-divider, the current-voltage converter F1 is used for converting the current signal into a voltage signal and inputting the voltage signal to the third input end and the fourth input end of the multiplier-divider, the first input end of the multiplier-divider is connected with the output end of the voltage adjusting unit, and the multiplier-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 passes through a measuring end of a current sensor H1 and then enters a current-voltage converter F1, a negative end of the current sensor H1 is connected with a second port of the multiplier-divider, and an output end of the current-voltage converter F1 is connected with a third port and a 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 to provide an operating voltage for a multiplier-divider, the cathode of the diode D10 is connected to the output terminal of the multiplier-divider, and the anode is grounded.
As shown in fig. 5, the first input terminal, the second input terminal, the third input terminal, and the fourth input terminal of the multiplier-divider are respectively N1, N2, D1, and D2, and the operation rule of the multiplier-divider is as follows:
N1×N2÷(D1×D2)
according to the operation rule, the generation of the steamed bun wave control signal lagging behind the alternating current input signal by the multiplier-divider 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 is specifically as follows:
the input of the third input end is the same as that of the fourth input end, the third input end and the fourth input end are both first voltage signals, and the multiplying and dividing device 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 signals to obtain the steamed bread wave control signal.
The first voltage signal is a voltage signal output by the current-to-voltage converter F1.
In this embodiment, as shown in fig. 6, the current sampling adjustment unit specifically includes:
a current sensor H2, an amplifier X2, a second PID adjusting circuit, a sawtooth wave signal source V2 and a comparator U1, the current sensor H2 is used for collecting an inductive current sampling signal in a Boost power factor correction module, amplifying the inductive current sampling signal, adding the inductive wave control signal and outputting the signal to the negative input end of an amplifier X2, the input end of the second PID regulating circuit is connected with the 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, for improving the response speed of the amplifier X2, the amplifier X2 gains the input signal of the negative input end to generate a gain steamed bun wave control signal, the gain steamed bun wave control signal is input to the negative input end of the comparator U1, the comparator U1 is used for comparing the gained steamed bun wave control signal with the sawtooth wave signal output by the sawtooth wave signal source V2 and then outputting the pulse signal.
The inductive current of the Boost power factor correction module flows into a measuring end of a current sensor H2 as an inductive current sampling signal, a positive end of the current sensor H2 is connected with an amplifier X2, an output end of the amplifier X2 is connected with a negative input end of a comparator U1, and a positive end of the comparator U1 is connected with the voltage source V2. The second PID adjusting 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 power amplifier comprises a push-pull driving amplifying circuit, a voltage source V3 and a voltage source V4, wherein the voltage source V3 and the voltage source V4 provide working voltage for the push-pull driving amplifying circuit, and the push-pull driving amplifying circuit is used for amplifying the power of a pulse signal output by the current sampling adjusting circuit into a control signal so as to enhance the driving capability.
And 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 a grid electrode of the MOS tube Q1, the on-off of the MOS tube Q1 is controlled, the inductor current in the Boost power factor correction module is controlled by controlling the MOS tube Q1, the inductor current is enabled to present a steamed bread wave envelope current lagging behind the alternating current input signal, and an input current lagging behind the alternating current input signal is generated according to the inductor current.
The second rectifier bridge circuit is formed by connecting four diodes D5, a diode D6, a diode D7 and a diode D8, wherein a cathode of the diode D5 is connected with a cathode of the diode D7, an anode of the diode D5 is connected with a cathode of the diode D6, an anode of the diode D6 is connected with an anode of the diode D8, a cathode of the diode D8 is connected with an anode of the diode D7, one end of the inductor L1 is connected to an anode of the diode D7, the other end of the inductor L1 is connected with an anode of the diode D9, an anode of the diode is connected with a drain of a MOS transistor, i.e., the D pole in fig. 8, a source of the MOS transistor, i.e., the S pole in fig. 8, is grounded together with an anode of the diode D8, a control end of the Boost power factor correction module is a gate of the MOS transistor, i.e., the G pole in fig. 8, a cathode of the diode D8 is connected with a cathode of a capacitor C10, the other end of the capacitor C10 is grounded, and the voltage at the capacitor C10 is the dc voltage signal. The current flowing through the inductor L1 is the inductor current and is also the input current in the pfc circuit, the ac input signal has one end connected to the anode of the diode D5 and the other end connected to the anode of the diode D7, and the ac input signal is also the input voltage in the pfc circuit.
According to the embodiment, an alternating current input signal is modulated into a control signal together with a negative feedback signal and an inductive current after hysteresis processing, the control signal is used for controlling the conduction and the cut-off of an MOS (metal oxide semiconductor) tube in a Boost power factor correction module, so that the inductive current in the Boost power factor correction module is controlled, the inductive current is a steamed bread wave envelope current lagging behind the alternating current input signal, an input current lagging behind the alternating current input signal is generated according to the inductive current, and the input current is a sine envelope current lagging behind the alternating current input signal. Therefore, the input equivalent impedance of the power factor correction circuit presents an inductive property, and the circuit is prevented from being broken down due to the resonance with the inductive device when the inductive device exists in the power supply system.
The terms "first," "second," and "third" herein have no special limiting meaning, and are used for descriptive purposes only to facilitate the presentation of different entities within a class of objects and should not be construed as limiting in any way or order or otherwise.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Example 2:
based on the power factor correction circuit described in embodiment 1, the implementation process in the characteristic scene of the invention is described by combining a specific application scene and by means of technical expressions in related scenes.
For example, in an onboard power supply system, because a generator presents an inductive property, it is required that a later-stage power utilization device cannot present a capacitive property, otherwise, an LC resonance point exists in a power grid, and there is a risk that the power grid is crashed due to resonance. 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 and the generation of a resonance point is avoided.
In view of the above scenarios, the present embodiment provides a power factor correction circuit as shown in fig. 9 to implement power factor correction on an onboard power supply system, wherein one end of a capacitor C8 in the Boost power factor correction module is connected to an inductor L1, and the other end is connected to an anode of a diode D8, so as to suppress noise, an AC input AC1 of the Boost power factor correction module is in the same phase, the same frequency, and the same size as an AC input AC2 in the sampling unit, and outputs of AC1 and AC2 are the AC input signals.
Waveforms of alternating current input signals input from an input end of a Boost power factor correction module and a shift unit are shown in fig. 10, the alternating current input signals are processed by a phase shift unit, the phases of the alternating current input signals are lagged to be current signals, the current signals present steamed bread wave waveforms shown in fig. 11, the frequency of the current signals is twice of the frequency of the alternating current input signals, in the multiplier-divider unit, the current signals are converted into voltage signals in a one-to-one conversion mode through a current-voltage sensor F1 and input to ends D1 and D2 of the multiplier-divider, the end N2 inputs the steamed bread wave signals collected and amplified through the current sensor, meanwhile, the end N1 of the multiplier-divider is connected with an output end of a voltage adjusting unit, and the voltage adjusting unit is connected with an output voltage signal of the Boost power factor correction module to enable the voltage adjusting unit to generate corresponding negative feedback signals according to the output voltage signals, the control circuit is used for keeping the stability of an output voltage signal, the negative feedback signal, a current signal and a voltage signal converted from the current signal are modulated into a steamed bread wave control signal by a multiplier-divider, an inductive current sampling signal of a Boost power factor correction module is acquired by a current sensor H2 of an overcurrent acquisition control unit, the inductive current sampling signal and the steamed bread wave control signal are amplified and modulated by an amplifier X2 to form a new steamed bread wave control signal, the frequency of a sawtooth wave generated by a sawtooth wave signal source V2 is the frequency for controlling the conduction and the cut-off of an MOS (metal oxide semiconductor) tube in the Boost power factor correction module, the new steamed bread wave control signal is compared with the sawtooth wave by a comparator U1 in the overcurrent acquisition control unit to generate a pulse signal, and the pulse signal becomes a control signal shown in figure 12 after the driving power is amplified by the driving unit, the control signal is used for controlling the conduction and the cut-off of the MOS tube, the current of the controlled MOS tube is as shown in fig. 13, the current of the MOS tube is used for controlling the inductive current in the Boost power factor correction module, so that the inductive current is a steamed bread envelope current lagging behind the alternating current input signal, the inductive current becomes a sinusoidal envelope current lagging behind the alternating current input signal as shown in fig. 14 after passing through a rectifier bridge circuit of the Boost power factor correction module, the sinusoidal 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 is inductive.
And the voltage of the output voltage signal is increased to about 390V by the Boost power factor correction module. The voltage adjusting unit, the multiplying and dividing 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, direct current output is kept. Meanwhile, the shifting unit, the multiplying and dividing 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 input alternating current signals after hysteresis processing, and the input current in the power factor correction circuit presents hysteresis sinusoidal envelope current.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A power factor correction circuit, comprising:
the device comprises a Boost power factor correction module and a control module; the Boost power factor correction module and the 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 to enable the input current to lag 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.
2. The pfc circuit of claim 1, wherein the control module comprises:
the device comprises a phase shift unit, a voltage adjusting unit, a multiplier-divider unit, a current sampling adjusting unit and a driving unit;
the device comprises a phase shifting unit, a voltage adjusting unit, a multiplier-divider unit, a current sampling adjusting unit and a driving unit, wherein 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 an inductive current of a 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 keep the voltage of the direct current voltage signal stable, the multiplier-divider unit is used for generating a steamed bread wave control signal according to the current signal and the negative feedback signal, the current sampling adjusting unit is used for collecting an inductive current sampling signal in the Boost power factor correction module, the steamed bread wave control signal is superposed with the inductive current sampling signal and then is compared with a sawtooth wave signal so as to generate a pulse signal, and the driving unit amplifies the pulse signal to form a control signal, and inputting the control signal to a control end of a Boost power factor correction module to control the Boost power factor correction module to enable the inductive current to lag behind the alternating current input signal, and generating the input current lagging behind the alternating current input signal according to the inductive current.
3. The power factor correction circuit of claim 2, wherein the phase shifting 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 shift circuit, the phase shift circuit is used for inputting the alternating current input signal into the first rectifier bridge circuit after hysteresis processing, the first rectifier bridge circuit is used for outputting a current signal lagging behind the alternating current input signal, and the current signal presents a steamed bread wave waveform lagging behind the alternating current input signal.
4. The pfc circuit of claim 2, wherein the voltage adjustment unit specifically comprises:
resistance R2, resistance R3, first PID regulating circuit, voltage source V1 and amplifier X1, resistance R2 and resistance R3 constitute bleeder circuit for inputing the negative input end of amplifier X1 after dividing the partial pressure of the voltage signal of input, the input of first PID regulating circuit is connected with amplifier X1's output, the output of first PID regulating circuit is connected with amplifier X1's negative input end for improve amplifier X1's response speed, amplifier X1 is used for with the negative input end the input and the voltage of voltage source V1 carry out the comparison after output the negative feedback signal.
5. The pfc circuit of claim 2, wherein the multiplier-divider unit comprises:
the current sensor H1, the current-voltage converter F1 and the multiplier-divider are used, the current sensor H1 is used for collecting and amplifying the current signal and inputting the current signal to the second input end of the multiplier-divider, the current-voltage converter F1 is used for converting the current signal into a voltage signal and inputting the voltage signal to the third input end and the fourth input end of the multiplier-divider, the first input end of the multiplier-divider is connected with the output end of the voltage adjusting unit, and the multiplier-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.
6. The power factor correction circuit according to claim 2, wherein the current sampling adjustment unit specifically comprises:
a current sensor H2, an amplifier X2, a second PID adjusting circuit, a sawtooth wave signal source V2 and a comparator U1, the current sensor H2 is used for collecting an inductive current sampling signal in a Boost power factor correction module, amplifying the inductive current sampling signal, adding the inductive wave control signal and outputting the signal to the negative input end of an amplifier X2, the input end of the second PID regulating circuit is connected with the 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, for improving the response speed of the amplifier X2, the amplifier X2 gains the input signal of the negative input end to generate a gain steamed bun wave control signal, the gain steamed bun wave control signal is input to the negative input end of the comparator U1, the comparator U1 is used for comparing the gained steamed bun wave control signal with the sawtooth wave signal output by the sawtooth wave signal source V2 and then outputting the pulse signal.
7. The pfc circuit of claim 2, wherein the driving unit comprises:
the power amplifier comprises a push-pull driving amplifying circuit, a voltage source V3 and a voltage source V4, wherein the voltage source V3 and the voltage source V4 provide working voltage for the push-pull driving amplifying circuit, and the push-pull driving amplifying circuit is used for amplifying the power of a pulse signal output by the current sampling adjusting circuit into a control signal so as to enhance the driving capability.
8. The pfc circuit of claim 1, wherein the Boost pfc module comprises in particular:
the control signal is input to a grid electrode of the MOS tube Q1, the on-off of the MOS tube Q1 is controlled, the inductor current in the Boost power factor correction module is controlled by controlling the MOS tube Q1, the inductor current is enabled to present a steamed bread wave envelope current lagging behind the alternating current input signal, and an input current lagging behind the alternating current input signal is generated according to the inductor current.
9. The pfc circuit of claim 5, wherein the multiplier-divider generates the steamed bread wave control signal lagging behind 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 comprises:
the input of the third input end is the same as that of the fourth input end, the third input end and the fourth input end are both first voltage signals, and the multiplying and dividing device 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 signals to obtain the steamed bread wave control signal.
10. The power factor correction circuit of claim 3, wherein a phase angle of a current signal outputted from the phase shift unit lagging behind the AC input signal is-arctan (ω RC), wherein R is a resistance value of a resistor R1, C is a capacitance value of a capacitor C1, and ω is an angular frequency of the AC input signal, and the magnitude of an output equivalent impedance in the power factor correction circuit is changed by changing the phase angle.
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