CN110277918B - Power supply control circuit and electronic equipment system - Google Patents

Power supply control circuit and electronic equipment system Download PDF

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Publication number
CN110277918B
CN110277918B CN201810207277.XA CN201810207277A CN110277918B CN 110277918 B CN110277918 B CN 110277918B CN 201810207277 A CN201810207277 A CN 201810207277A CN 110277918 B CN110277918 B CN 110277918B
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circuit
control circuit
pfc
switching element
pulse modulation
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CN110277918A (en
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赵杨威
高宽志
王健新
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Hisense Visual Technology Co Ltd
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Hisense Visual Technology Co Ltd
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Priority to CN201810207277.XA priority Critical patent/CN110277918B/en
Priority to CN202110648583.9A priority patent/CN113381613B/en
Publication of CN110277918A publication Critical patent/CN110277918A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a power supply control circuit and an electronic equipment system. The power control circuit includes: the device comprises a rectification filter circuit, a PFC control circuit, a synchronous circuit, a pulse modulation control circuit and a power conversion circuit. The rectification filter circuit is connected with the PFC circuit, and the control end of the PFC circuit is connected with the PFC control circuit. The output end of the PFC circuit is connected with the input end of the power conversion circuit, the control end of the power conversion circuit is connected with the pulse modulation control circuit, the synchronous circuit is respectively connected with the PFC control circuit and the pulse modulation control circuit, and the synchronous circuit can send a synchronous signal to the pulse modulation control circuit when the PFC control circuit controls the PFC circuit to stop charging, so that the pulse modulation control circuit controls the power conversion circuit to charge through the PFC circuit. The invention reduces ripple current in the PFC circuit and lowers the model selection specification of components.

Description

Power supply control circuit and electronic equipment system
Technical Field
The invention relates to the technical field of power supplies, in particular to a power supply control circuit and an electronic equipment system.
Background
Many Power control circuits employ Power Factor Correction (PFC) to correct the line current to produce a sinusoidal input current waveform that is in phase with the line voltage. Thus, the arrangement of a PFC circuit at the front end of the power conversion circuit can prevent unnecessary power loss and heat dissipation in the power delivery system.
Fig. 1 is a circuit schematic diagram of a conventional power control circuit provided in the present invention, and as shown in fig. 1, a general power control circuit includes: the power supply comprises a PFC circuit, a power conversion circuit, a PFC control circuit and a Pulse Modulation control circuit (shown as a Pulse Width Modulation (PWM)/Pulse Frequency Modulation (PFM) control circuit in fig. 1), wherein power devices in the PFC circuit comprise an inductor L1, a diode VD1, a switching tube V1 and an electrolytic capacitor C2. The PFC control circuit can control the switch tube V1, and realizes the charging process of the inductor L1 by the power supply and the charging process of the electrolytic capacitor C2 by the inductor L1. The pulse modulation control circuit can control a switching tube V2 in the power conversion circuit, and the charging process of the electrolytic capacitor C2 on the power conversion circuit is realized.
However, the electrolytic capacitor C2 in the PFC circuit will simultaneously bear the charging current flowing out from the front stage and the discharging current required by the rear stage, so the ripple current flowing through the electrolytic capacitor C2 in the PFC circuit will be very large, and the required specification of the components in the PFC circuit will be increased.
Disclosure of Invention
The invention provides a power supply control circuit and an electronic equipment system, which aim to solve the problem that the conventional power supply control circuit needs components with higher specifications due to larger fluctuating current passing through a PFC circuit.
In a first aspect, the present invention provides a power control circuit, comprising: the device comprises a rectification filter circuit, a PFC control circuit, a synchronous circuit, a pulse modulation control circuit and a power conversion circuit;
the output end of the rectification filter circuit is connected with the input end of the PFC circuit, and the PFC control circuit is connected with the control end of the PFC circuit and used for controlling the PFC circuit to charge or stop charging;
the output end of the PFC circuit is connected with the input end of the power conversion circuit, and the control end of the power conversion circuit is connected with the pulse modulation control circuit;
the synchronous circuit is respectively connected with the PFC control circuit and the pulse modulation control circuit, and is used for sending a synchronous signal to the pulse modulation control circuit when the PFC control circuit controls the PFC circuit to stop charging, so that the pulse modulation control circuit controls the power conversion circuit to charge through the PFC circuit.
Optionally, the synchronization circuit comprises: a first switching element and a first resistor;
the first end of the first switching element is connected with the output end of the PFC control circuit;
the second end of the first switch element is respectively connected with the first end of the first resistor and the input end of the pulse modulation control circuit, and is used for sending the synchronous signal to the pulse modulation control circuit;
the second end of the first resistor is used for connecting a first level, and the third end of the first switch element is grounded.
Optionally, the first switching element is a MOS transistor or a triode.
Optionally, the synchronization circuit comprises: a second switching element;
the first end of the second switching element is connected with the output end of the PFC control circuit;
and the second end of the second switching element is connected with the input end of the pulse modulation control circuit and is used for sending the synchronous signal to the pulse modulation control circuit.
Optionally, the second switching element comprises: any one of an operational amplifier, a comparator, and an inverter.
Optionally, the rectifying and filtering circuit includes: a rectifying circuit and a first capacitor;
the input end of the rectifying circuit is used for being connected with a power supply, the first output end and the second output end of the rectifying circuit are connected with the first capacitor in parallel, the first output end of the rectifying circuit is further connected with the first input end of the PFC circuit, and the second output end of the rectifying circuit and the second input end of the PFC circuit are grounded.
Optionally, the PFC circuit includes: the first inductor, the first diode, the third switching element, the second resistor and the second capacitor;
the first output end of the rectifying filter circuit is connected with the first end of the first inductor, the second end of the first inductor is connected with the anode of the first diode, the cathode of the first diode is respectively connected with the first end of the second capacitor and the first input end of the power conversion circuit, the first end of the third switching element is connected with the PFC control circuit, the second end of the third switching element is respectively connected with the second end of the first inductor and the anode of the first diode, the third end of the third switching element is connected with the first end of the second resistor, and the second end of the second resistor, the second output end of the rectifying filter circuit, the second end of the second capacitor and the second input end of the power conversion circuit are all grounded.
Optionally, the power conversion circuit comprises: the first switch element, the first resistor, the first transformer, the second diode, the third diode, the second inductor and the third capacitor are connected in series;
wherein a first end of the fourth switching element is connected with the pulse modulation control circuit, a second end of the fourth switching element is connected with a first input end of the first transformer, a third end of the fourth switching element is connected with a first end of the third resistor, a second input end of the first transformer is connected with a first output end of the PFC circuit, a second output end of the PFC circuit and a second end of the third resistor are both grounded, a first output end of the first transformer is connected with the anode of the second diode, the cathode of the second diode is respectively connected with the cathode of the third diode and the first end of the second inductor, the second end of the second inductor is used for connecting the input end of a load, the second output end of the first transformer is connected with the anode of the third diode, the second output end of the first transformer and the second end of the second inductor are further connected with the third capacitor in parallel.
Optionally, the power conversion circuit comprises: a fifth switching element, a sixth switching element, a third inductor, a fourth capacitor, a second transformer, a fourth diode, a fifth diode, and a fifth capacitor;
wherein a first end of the fifth switching element and a first end of the sixth switching element are both connected to the pulse modulation control circuit, a second end of the fifth switching element and a second end of the sixth switching element are respectively connected to a first end of the third inductor, a third end of the fifth switching element is connected to a first output end of the PFC circuit, a second output end of the PFC circuit, a third end of the sixth switching element and a first end of the fourth capacitor are all grounded, a second end of the third inductor is connected to a first input end of the second transformer, a second end of the fourth capacitor is connected to a second input end of the second transformer, a first output end of the second transformer is connected to an anode of the fourth diode, and a second output end of the second transformer is connected to an anode of the fifth diode, and the third output end of the second transformer and the cathode of the fourth diode are connected in parallel with the fifth capacitor, and the cathode of the fourth diode is used for connecting the input end of a load.
In a second aspect, the present invention provides an electronic device system, comprising: a power supply, an electronic device, and a power supply control circuit as described in the first aspect.
According to the power supply control circuit and the electronic equipment system, the input end of the PFC circuit is connected with the output end of the rectification filter circuit, and the PFC control circuit is connected with the control end of the PFC circuit, so that the PFC control circuit can control the PFC circuit to store energy passing through the rectification filter circuit, and the charging process of the PFC circuit is achieved. And because the PFC circuit and the pulse modulation control circuit are respectively connected with the power conversion circuit, and the synchronous circuit is respectively connected with the PFC control circuit and the pulse modulation control circuit, when the PFC control circuit controls the PFC circuit to stop charging, the synchronous circuit can transmit a synchronous signal to the pulse modulation control circuit, so that the pulse modulation control circuit can control the power conversion circuit to charge through the PFC circuit, namely, the discharging process of the PFC circuit is realized. The embodiment solves the problem that the existing power control circuit needs higher-specification components due to larger fluctuating current of the PFC circuit, realizes the association between the PFC circuit and the power conversion circuit through the arranged synchronous circuit, and also realizes the controllability of the driving time sequence for charging and discharging the PFC circuit of the circuit, so that the time when the PFC circuit stops charging and the time when the PFC circuit starts discharging can be kept synchronous, thus the discharging process of the PFC circuit can be realized only when the PFC circuit stops charging, the charging current and the discharging current at the same time in the PFC circuit are reduced, the ripple current flowing through the PFC circuit is reduced, the specification requirements on the components in the PFC circuit are reduced, the cost is saved, and the working stability of the circuit is improved.
Drawings
FIG. 1 is a circuit diagram of a conventional power control circuit according to the present invention;
FIG. 2 is a schematic diagram of a power control circuit according to the present invention;
FIG. 3 is a timing diagram of a power control circuit according to the present invention;
FIG. 4 is a schematic diagram of a synchronous circuit according to the present invention;
FIG. 5 is a schematic diagram of a synchronous circuit according to the present invention;
FIG. 6 is a schematic diagram of a power control circuit according to the present invention;
FIG. 7 is a schematic structural diagram of a rectifying and filtering circuit according to the present invention;
fig. 8 is a schematic structural diagram of a PFC circuit according to the present invention;
FIG. 9 is a schematic circuit diagram of a power conversion circuit provided in the present invention;
FIG. 10 is a schematic circuit diagram of a power conversion circuit provided in the present invention;
FIG. 11A is a waveform diagram of a conventional power control circuit according to the present invention;
FIG. 11B is a waveform diagram of a conventional power control circuit according to the present invention;
FIG. 11C is a waveform diagram of a conventional power control circuit according to the present invention;
FIG. 12A is a waveform diagram of a power control circuit according to the present invention;
FIG. 12B is a waveform diagram of a power control circuit according to the present invention;
FIG. 12C is a waveform diagram of a power control circuit according to the present invention;
fig. 13 is a schematic structural diagram of an electronic device system provided in the present invention.
Detailed Description
As shown in fig. 1, when the PFC control circuit controls the switching tube V1 to be turned on, the power supply stores energy in the inductor L1; when the PFC control circuit controls the switching tube V1 to be turned off, the energy of the inductor L1 is released through VD1, and the electrolytic capacitor C2 is charged. When the pulse modulation control circuit controls the switch tube V2 to be conducted, the electrolytic capacitor C2 releases energy through the transformer T1, and the transformer T1 converts the released energy to obtain the required working voltage.
As can be understood by those skilled in the art, in the conventional power control circuit, the PFC circuit at the front stage and the power conversion circuit at the rear stage are not controllable in terms of driving timing, and the electrolytic capacitor C2 can simultaneously bear the charging current flowing out from the front stage and the discharging current required by the rear stage, so that the ripple current flowing through the electrolytic capacitor C2 is large, and the requirement on the specification of the electrolytic capacitor C2 in the PFC circuit is high.
Further, if the specification of the electrolytic capacitor C2 meeting the circuit requirements is selected, the cost of components consumed by the conventional power control circuit is increased, and the ripple current on the electrolytic capacitor C2 easily burns out the electrolytic capacitor C2, so that the PFC circuit is short-circuited and the charging and discharging process cannot be completed, and thus the conventional power control circuit cannot complete the conversion process of the mains supply. In order to solve the existing problems, the present embodiment can change the driving timing of the PFC circuit and the power conversion circuit from being uncontrollable to being controllable, and reduce the charging current and the discharging current flowing through the PFC circuit, thereby reducing the cost of components and reducing the influence of ripple current. The specific structure of the power control circuit in this embodiment will be described in detail with reference to fig. 2.
Fig. 2 is a schematic structural diagram of a power control circuit provided in the present invention, and fig. 3 is a timing diagram of the power control circuit provided in the present invention. As shown in fig. 2, the power control circuit of the present embodiment may include: the device comprises a rectification filter circuit, a PFC control circuit, a synchronous circuit, a pulse modulation control circuit and a power conversion circuit.
The output end of the rectification filter circuit is connected with the input end of the PFC circuit, and the PFC control circuit is connected with the control end of the PFC circuit and used for controlling the PFC circuit to charge or stop charging.
The output end of the PFC circuit is connected with the input end of the power conversion circuit, and the control end of the power conversion circuit is connected with the pulse modulation control circuit.
The synchronous circuit is respectively connected with the PFC control circuit and the pulse modulation control circuit, and is used for sending a synchronous signal to the pulse modulation control circuit when the PFC control circuit controls the PFC circuit to stop charging, so that the pulse modulation control circuit controls the power conversion circuit to charge through the PFC circuit.
Specifically, the rectifying and filtering circuit in this embodiment can not only convert the commercial power into pulsating direct current, but also filter out high frequency and pulse interference thereof. The embodiment does not limit the specific implementation form of the rectifying and filtering circuit.
Further, in this embodiment, the PFC control circuit is connected to the control terminal of the PFC circuit, and is capable of sending the first driving signal Vg1 to the PFC circuit, and since the output terminal of the rectifying and filtering circuit is connected to the input terminal of the PFC circuit, the first driving signal Vg1 is capable of controlling the PFC circuit to obtain energy from a path passing through the rectifying and filtering circuit, so as to implement a charging process on the PFC circuit, and further implement a charging process or a charging stop process on the PFC circuit.
Specifically, when the first driving signal Vg1 of the PFC control circuit controls the PFC circuit to start charging, the PFC circuit can convert the rectified and filtered pulsating dc voltage into a relatively stable dc voltage, and further store energy to complete the charging process. When the driving signal of the PFC control circuit controls the PFC circuit to stop charging, the PFC circuit cannot continue charging. In this embodiment, the PFC circuit may be a PFC circuit in an existing power control circuit, or may be in other forms.
Further, the first driving signal Vg1 of the PFC control circuit can control the PFC circuit to implement the charging or stop the charging process. The PFC control circuit in this embodiment may adopt a PFC control circuit in an existing power control circuit, or may adopt other forms, which is not limited in this embodiment. Optionally, the PFC control circuit is controlled in any one of a Critical Conduction Mode (CRM), a continuous inductor current Mode (CCM), and a discontinuous inductor current Mode (DCM) interleaving Mode.
Specifically, in this embodiment, the pulse modulation control circuit is connected to the control terminal of the power conversion circuit, and is capable of transmitting and sending the second driving signal Vg2 to the power conversion circuit, and since the output terminal of the PFC circuit is connected to the input terminal of the power conversion circuit, the second driving signal Vg2 is capable of controlling the power conversion circuit to obtain the energy stored in the PFC circuit and convert the energy to obtain the actually required working voltage, so as to further implement the process of discharging or stopping discharging of the PFC circuit to the power conversion circuit.
Further, the pulse modulation controlled second driving signal Vg2 can control the PFC circuit to charge or stop the charging process for the power conversion circuit. In this embodiment, the pulse modulation control circuit may adopt a pulse modulation control circuit in an existing power supply control circuit, or may adopt other forms, which is not limited in this embodiment. Optionally, the pulse modulation control circuit is controlled by any one of PWM and PFM.
On one hand, when the PFC control circuit sends the first driving signal Vg1 to the PFC circuit to instruct the PFC circuit to stop charging, since the PFC control circuit is connected to the synchronization circuit, which is connected to the power conversion circuit, the synchronization circuit can send a synchronization signal to the pulse modulation control circuit according to the first driving signal Vg1, and when the pulse power control circuit receives the synchronization signal, the synchronization circuit can send the second driving signal Vg2 to the power conversion circuit, and the second driving signal Vg2 enables the power conversion circuit to synchronously start a discharging process of the PFC circuit to the power conversion circuit, thereby releasing energy stored in the PFC circuit. In this way, by setting the synchronization circuit in the present embodiment, the time when the charging of the PFC circuit is stopped can be taken as the time when the discharging of the PFC circuit is started and the two times are kept synchronized, so that the charging process and the discharging process of the PFC circuit become different driving timings.
Specifically, in this embodiment, the first driving signal Vg1 that the PFC control circuit controls whether the PFC circuit charges and the second driving signal Vg2 that the pulse modulation control circuit controls whether the power conversion circuit charges through the PFC circuit may be at a high level, a low level, or an opposite level, and the specific forms of the first driving signal Vg1 and the second driving signal Vg2 are not limited, and only the synchronization signal output by the synchronization circuit to the pulse modulation control circuit is needed, so that the time when the PFC circuit stops charging and the time when the power conversion circuit starts charging through the PFC circuit are kept synchronous.
Next, in a specific embodiment, a specific implementation manner of controlling the driving timing at which the charging of the PFC circuit is stopped and the driving timing at which the charging of the power conversion circuit is started is described in detail, assuming that the cycle of the driving timing at which the charging of the PFC circuit is stopped and the driving timing at which the charging of the power conversion circuit is started is kept fixed.
As shown in fig. 3, when the PFC control circuit sends the first driving signal Vg1 to the PFC circuit, the PFC circuit can store energy to implement a charging process. When the PFC control circuit sends a first driving signal Vg1 to the PFC circuit, which can cause the PFC circuit to stop charging, the PFC circuit stops charging. Due to the connection of the synchronization circuit with the PFC control circuit, the PFC control circuit also sends a first driving signal Vg1 to the synchronization circuit that causes the PFC circuit to stop charging. Since the synchronization circuit is connected to the pulse modulation control circuit, the synchronization circuit can transmit a synchronization signal to the pulse modulation control circuit according to the first drive signal Vg 1. And because the power change circuit is connected with the pulse modulation control circuit, the pulse modulation control circuit can send a second driving signal Vg2 to the power change circuit according to the synchronous signal, so that the power change circuit realizes a charging process through the PFC circuit. Thus, the PFC circuit can achieve discharge while stopping charging.
Further, the PFC circuit and the power conversion circuit are associated through the provided synchronous circuit, the first driving signal Vg1 for stopping charging the PFC circuit and the second driving signal Vg2 for starting discharging the PFC circuit are controllable, and the time for stopping charging of the PFC circuit and the time for starting discharging of the power conversion circuit by the PFC circuit can be kept synchronous.
It should be noted here that the cycle of the driving timing for stopping charging of the PFC circuit and the driving timing for starting charging of the power conversion circuit may not be fixed, and a specific implementation manner of controlling the driving timing for stopping charging of the PFC circuit and the driving timing for starting charging of the power conversion circuit may refer to the above-mentioned manner, which is not described herein again.
On the other hand, when the power conversion circuit detects that the power obtained by charging the PFC circuit reaches the rated power, the power conversion circuit may send an instruction signal for stopping charging to the pulse modulation control circuit, the pulse modulation control circuit may output a second driving signal Vg2 to the power conversion circuit according to the instruction signal for stopping charging, the second driving signal Vg2 may disconnect the PFC circuit, and may instruct the power conversion circuit not to charge any more through the PFC circuit, and the PFC circuit may not continue to discharge to the power conversion circuit.
As can be understood by those skilled in the art, in the conventional power control circuit, the PFC circuit at the front stage and the power conversion circuit at the rear stage are not controllable in terms of driving timing, and therefore, a charging current and a discharging current exist in the PFC circuit at the front stage at the same time, so that the PFC circuit is susceptible to the influence of ripple current. The power control circuit of the present embodiment is connected to the PFC control circuit and the pulse modulation control circuit through the synchronization circuit, respectively, so that the driving timings of the PFC circuit and the power conversion circuit are controllable. Moreover, different from the process that the PFC circuit in the prior art needs to release and store the energy obtained by charging, the power conversion circuit can directly obtain the energy obtained by charging the PFC circuit, and when the PFC circuit stops charging, the process that the PFC circuit discharges to the power conversion circuit can be realized, so that the charging current and the discharging current at the same moment on the PFC circuit are reduced, the ripple current flowing through the PFC circuit is reduced, the influence of the ripple current on the PFC circuit is reduced, and the specification requirements on components in the PFC circuit are also reduced.
The power control circuit provided by this embodiment is connected to the output end of the rectifying and filtering circuit through the input end of the PFC circuit, and the PFC control circuit is connected to the control end of the PFC circuit, so that the PFC control circuit can control the PFC circuit to store energy passing through the rectifying and filtering circuit, thereby implementing a charging process of the PFC circuit. And because the PFC circuit and the pulse modulation control circuit are respectively connected with the power conversion circuit, and the synchronous circuit is respectively connected with the PFC control circuit and the pulse modulation control circuit, when the PFC control circuit controls the PFC circuit to stop charging, the synchronous circuit can transmit a synchronous signal to the pulse modulation control circuit, so that the pulse modulation control circuit can control the power conversion circuit to charge through the PFC circuit, namely, the discharging process of the PFC circuit is realized. The embodiment solves the problem that the existing power control circuit needs higher-specification components due to larger fluctuating current of the PFC circuit, realizes the association between the PFC circuit and the power conversion circuit through the arranged synchronous circuit, and also realizes the controllability of the driving time sequence for charging and discharging the PFC circuit of the circuit, so that the time when the PFC circuit stops charging and the time when the PFC circuit starts discharging can be kept synchronous, thus the discharging process of the PFC circuit can be realized only when the PFC circuit stops charging, the charging current and the discharging current at the same time in the PFC circuit are reduced, the ripple current flowing through the PFC circuit is reduced, the specification requirements on the components in the PFC circuit are reduced, the cost is saved, and the working stability of the circuit is improved.
In addition to the embodiments of fig. 2 and 3, the specific structure of the power control circuit in this embodiment will be described in detail with reference to fig. 4 to 10, fig. 11A, fig. 11B, fig. 11C, fig. 12A, fig. 12B, and fig. 12C.
First, there are various specific implementation forms of the synchronization circuit in this embodiment, and this embodiment does not limit this. The following describes the specific structure of the synchronization circuit in this embodiment in detail with reference to fig. 4 and 5
Fig. 4 is a schematic structural diagram of a synchronization circuit provided in the present invention, and as shown in fig. 4, the synchronization circuit includes: a first switching element and a first resistor.
The first end of the first switch element is connected with the output end of the PFC control circuit. The second end of the first switch element is respectively connected with the first end of the first resistor and the input end of the pulse modulation control circuit and used for sending a synchronous signal to the pulse modulation control circuit. The second end of the first resistor is used for connecting a first level, and the third end of the first switch element is grounded.
Specifically, the first terminal of the first switching element is connected to the output terminal of the PFC control circuit, so as to receive the first driving signal Vg1 sent by the PFC control circuit. The second terminal of the first switching element is connected to the input terminal of the pulse modulation control circuit, and can transmit a synchronization signal to the pulse modulation control circuit. And because the first end of the first resistor and the input end of the pulse modulation control circuit are both connected with the second end of the first switch element, and the second end of the first resistor is connected with the first level, the voltage of the input end of the pulse modulation control circuit can be equal to the voltage of the third end of the first switch element, and the voltage of the input end of the pulse modulation control circuit can also be equal to the voltage of the first end of the first resistor.
Further, in this embodiment, when the first driving signal Vg1 can control the PFC circuit to stop charging, the output voltage of the second terminal of the first switching element is controlled to be different from the voltage of the first terminal of the first resistor, so as to change the voltage of the input terminal of the pulse modulation control circuit, so that the pulse modulation control circuit can detect that the PFC circuit stops charging according to the voltage, and further send the second driving signal Vg2 to the power conversion circuit, so that the power conversion circuit can start charging through the PFC circuit.
Alternatively, the first switching element may be a MOS transistor or a triode. For convenience of explanation, as shown in fig. 4, the first switching element in this embodiment is illustrated by using an NPN transistor as an example. Specifically, when the first switching element is an NPN transistor, the first end of the first switching element is a base of the NPN transistor, the second end of the first switching element is a collector of the NPN transistor, and the third end of the first switching element is an emitter of the NPN transistor.
Further, in this embodiment, when the first driving signal Vg1 is at a low level, the PCF circuit is charged, the base of the NPN transistor is at a low level, the emitter of the NPN transistor is at a low level, the NPN transistor cannot be turned on, and the voltage at the input end of the pulse modulation control circuit is equal to the voltage at the first end of the first resistor and is at a low level.
When the first driving signal Vg1 is at a high level, the PCF circuit stops charging, the base of the NPN transistor is at a high level, the emitter of the NPN transistor is at a low level, the NPN transistor is turned on, and the voltage at the input terminal of the pulse modulation control circuit is equal to the voltage output by the collector of the NPN transistor, which is at a high level.
In this way, the pulse modulation control circuit can detect the change of the voltage output by the collector of the NPN triode, recognize the change of the first driving signal Vg1 output by the PFC control circuit to the PFC circuit, and further send the second driving signal Vg2 to the power conversion circuit, so that the power conversion circuit can start charging through the PFC circuit. Therefore, by setting the first switching element and the first resistor, the timing at which the PFC circuit stops charging and the timing at which the PFC circuit starts discharging can be kept synchronized, and the driving timing of the PFC circuit and the power conversion circuit can be controlled.
In a second possible implementation manner, fig. 5 is a schematic structural diagram of a synchronous circuit provided in the present invention, and fig. 5 is a schematic structural diagram of a rectifying and filtering circuit provided in the present invention, as shown in fig. 5, the synchronous circuit includes: a second switching element.
And the first end of the second switching element is connected with the output end of the PFC control circuit. And the second end of the second switching element is connected with the input end of the pulse modulation control circuit and is used for sending a synchronous signal to the pulse modulation control circuit.
Specifically, the first end of the second switch element is connected to the output end of the PFC control circuit, and is capable of receiving a first driving signal Vg1 sent by the PFC control circuit. The second terminal of the second switching element is connected to the input terminal of the pulse modulation control circuit, and can transmit a synchronization signal to the pulse modulation control circuit in accordance with the first drive signal Vg 1. That is, the second switch element can send a corresponding synchronization signal to the pulse adjustment control circuit according to the change of the level direction or the change of the magnitude of the first driving signal Vg1, so that the pulse modulation control circuit can detect whether the charging of the PFC circuit is stopped according to the synchronization signal, and then can send the second driving circuit Vg2 to the power conversion circuit, so that the power conversion circuit can realize the charging process through the PFC circuit. Therefore, by setting the second switching element, the timing at which the PFC circuit stops charging and the timing at which the PFC circuit starts discharging can be kept synchronized, and the driving timing of the PFC circuit and the power conversion circuit can be controlled.
Optionally, the second switching element comprises: any one of an operational amplifier, a comparator, and an inverter. For convenience of description, referring to fig. 5, the second switching element in this embodiment is illustrated by taking an inverter as an example. Specifically, the first terminal of the second switching element is an input terminal of the inverter, and the second terminal of the second switching element is an output terminal of the inverter.
Specifically, the present embodiment may set that when the first driving signal Vg1 is at a low level, the PCF circuit stops charging, the inverter may receive the first driving signal Vg1, and may transmit the inverted first driving signal Vg1 as a synchronization signal to the pulse adjustment control circuit, so that the pulse adjustment control circuit detects the high level. And when the pulse regulation control circuit is set to detect that the synchronous signal is at a high level, the pulse regulation control circuit sends a second driving signal Vg2 to the power conversion circuit to control the power conversion circuit to be charged through the PFC circuit, namely, the discharging process of the PFC circuit is realized.
Further, the PFC control circuit and the pulse modulation control circuit in this embodiment may be integrated chips, or may also be control circuits built for each component, and the specific forms of the PFC control circuit and the pulse modulation control circuit are not limited in this embodiment.
In a specific embodiment, fig. 6 is a schematic structural diagram of a power control circuit provided in the present invention, and as shown in fig. 6, the PFC control circuit in this embodiment may include: the pulse modulation control circuit comprises a first control module, a first RS trigger and a first driving module, and can comprise: the second control module, the second RS trigger and the second driving module, and the synchronization circuit may be an inverter.
The two output ends of the first control module are respectively connected with the R input end and the S input end of the first RS trigger, the Q output end of the first RS trigger is respectively connected with the first driving module and the phase inverter and used for sending a first driving signal Vg1 to the first driving module and the phase inverter, and the first driving module is connected with the PFC circuit.
The phase inverter is connected with the S input end of the second RS trigger and used for sending a synchronous signal to the S input end of the second RS trigger, the second control module is connected with the R input end of the second RS trigger, the Q output end of the second RS trigger is connected with the second driving module, and the second driving module is connected with the power conversion circuit and used for sending a second driving signal Vg2 to the power conversion circuit.
Specifically, the two output ends of the first control module are respectively connected with the R input end and the S input end of the first RS flip-flop, so that the first control module can output the first driving signal Vg1 through the first RS flip-flop, and since the Q output end of the first RS flip-flop is respectively connected with the first driving module and the inverter, the levels of the first driving signal Vg1 input to the first driving module and the inverter are the same.
Through the connection between the first driving module and the PFC circuit, the first driving module can control the PFC circuit to store energy passing through the rectifying and filtering circuit according to the first driving signal Vg1, thereby implementing a charging process of the PFC circuit. When the first driving signal Vg1 changes the level direction and can control the PFC circuit to stop charging, the first driving signal Vg1 may become a synchronization signal having a level opposite to that of the first driving signal Vg1 through an inverter. The connection of the inverter and the second RS trigger and the connection of the second RS trigger and the second driving module enable the synchronous signal to be input into the second driving module through the second RS trigger. Due to the connection between the second driving module and the power conversion circuit, the second driving module can send a second driving signal Vg2 to the power conversion circuit according to the synchronization signal, so that the second driving signal Vg2 can control the power conversion circuit to charge through the PFC circuit.
Further, referring to fig. 3, when the first driving signal Vg1 of the PFC control circuit and the second driving signal Vg2 of the pulse modulation control circuit are both at a high level, and the PFC circuit stops charging, the first control module outputs the first driving signal Vg1 at a low level through the Q terminal of the first RS flip-flop, and the first driving module can control the PFC circuit to stop charging. Meanwhile, the first driving signal Vg1 can be changed into a high level through the reverse action of the inverter, that is, a synchronous signal, the synchronous signal passes through the S input end of the second RS flip-flop, due to the characteristics of the first RS flip-flop, the Q end of the second RS flip-flop outputs the high level, the second RS flip-flop transmits the high level to the second driving module, and the second driving module can output the second driving signal Vg2 to control the power conversion circuit to realize charging through the PFC circuit, so that the PFC circuit can start discharging, and the time when the PFC circuit stops charging can be kept synchronous with the time when the PFC circuit starts discharging.
Next, optionally, fig. 7 is a schematic structural diagram of the rectifying and filtering circuit provided in the present invention, and as shown in fig. 7, the rectifying and filtering circuit of the power control circuit in this embodiment includes: a rectifying circuit and a first capacitor. The input end of the rectifying circuit is used for being connected with a power supply, a first output end and a second output end of the rectifying circuit are connected with a first capacitor in parallel, the first output end of the rectifying circuit is further connected with a first input end of the PFC circuit, and the second output end of the rectifying circuit and the second input end of the PFC circuit are grounded.
Specifically, the rectifier circuit in this embodiment can convert a power supply (such as a mains) into pulsating direct current, and the specific form of the rectifier circuit is not limited in this embodiment. Optionally, the rectification circuit is a full bridge rectifier. Specifically, the rectifier circuit is mainly a bridge circuit composed of four diodes to convert an input ac voltage into an output dc voltage. And because the capacitor has the characteristic of filtering high frequency and pulse interference, therefore, the first capacitor is connected in parallel with two output ends (a first output end and a second output end) of the rectification circuit, and the PFC circuit is also connected in parallel with the two output ends of the rectification circuit, so that the rectification filter circuit can send the direct-current voltage of the output pulse to the PFC circuit. The specific form of the rectifying and filtering circuit in this embodiment is not limited to the above specific structure, and this embodiment does not limit this.
Next, fig. 8 is a schematic structural diagram of the PFC circuit according to the present invention. As shown in fig. 8, the PFC circuit of the power control circuit in this embodiment includes: the circuit comprises a first inductor, a first diode, a third switching element, a second resistor and a second capacitor.
The first output end of the rectifying filter circuit is connected with the first end of the first inductor, the second end of the first inductor is connected with the anode of the first diode, the cathode of the first diode is respectively connected with the first end of the second capacitor and the first input end of the power conversion circuit, the first end of the third switching element is connected with the PFC control circuit, the second end of the third switching element is respectively connected with the second end of the first inductor and the anode of the first diode, the third end of the third switching element is connected with the first end of the second resistor, and the second end of the second resistor, the second output end of the rectifying filter circuit, the second end of the second capacitor and the second input end of the power conversion circuit are all grounded.
Specifically, the third switching element in this embodiment may be a transistor or a field effect transistor, which is not limited in this embodiment. The first end of the third switching element is a control end, and the second end and the third end are input/output ends. In addition, the specific types of the first inductor, the first diode and the second capacitor are not limited in this embodiment.
Further, when the PFC control circuit controls the third switching element to be turned on, the power supply may store energy for the first inductor via the rectifying and filtering circuit. When the PFC control circuit controls the third switching element to be disconnected, the PFC control circuit, the synchronous circuit and the pulse modulation control signal are connected, and the synchronous circuit sends the synchronous signal to the pulse modulation control circuit, so that the power conversion circuit can be charged through the PFC circuit, the first inductor can firstly charge the power conversion circuit, and when the energy released by the first inductor meets the requirement of the power conversion circuit and is redundant, the first inductor can store the residual energy through the second capacitor.
Finally, fig. 9 is a circuit schematic diagram of the power conversion circuit provided by the present invention, and fig. 10 is a circuit schematic diagram of the power conversion circuit provided by the present invention. The power conversion circuit in this embodiment may adopt different topology architectures such as flyback, forward, half-bridge, full-bridge, and the like, which is not limited in this embodiment. For convenience of explanation, the present embodiment adopts two implementations as shown in fig. 9 and fig. 10 to explain the specific structure of the power conversion circuit.
In a first possible implementation manner, as shown in fig. 9, the power conversion circuit includes: the circuit comprises a fourth switching element, a third resistor, a first transformer, a second diode, a third diode, a second inductor and a third capacitor.
And the first end of the fourth switching element is connected with the pulse modulation control circuit. The second end of the fourth switching element is connected with the first input end of the first transformer, the third end of the fourth switching element is connected with the first end of the third resistor, the second input end of the first transformer is connected with the first output end of the PFC circuit, the second output end of the PFC circuit and the second end of the third resistor are both grounded, the first output end of the first transformer is connected with the anode of the second diode, the cathode of the second diode is respectively connected with the cathode of the third diode and the first end of the second inductor, the second end of the second inductor is used for being connected with the input end of a load, the second output end of the first transformer is connected with the anode of the third diode, and the second output end of the first transformer and the second end of the second inductor are further connected with a third capacitor in parallel.
Specifically, in this embodiment, the fourth switching element may be a transistor or a field effect transistor, which is not limited in this embodiment. The first end of the fourth switching element is a control end, and the second end and the third end are input/output ends. In addition, the specific types of the first transformer, the second diode, the third diode, the second inductor, and the third capacitor are not limited in this embodiment.
Further, when the PFC circuit stops charging, the PFC control circuit may send not only the first driving signal Vg1 for stopping charging to the PFC circuit, but also send the first driving signal Vg1 to the synchronous circuit, and through the connection between the synchronous circuit and the pulse modulation control circuit, the synchronous circuit sends a synchronous signal to the pulse modulation control circuit, so that the pulse modulation control circuit may output the second driving signal Vg2 for turning on the fourth switching element, and further, the PFC circuit may output the required working voltage through the first transformer with the energy stored by itself, and through the filtering action of the second diode and the second inductor, the output working voltage is rectified by the second diode and then becomes smooth, and the setting of the second diode may also increase the capability of driving the load. Adopt second diode and third diode can play the effect of reposition of redundant personnel, reduce the heat for the probability of two diode damages descends a lot, and third electric capacity can also filter high frequency component's effect.
In a second possible implementation manner, as shown in fig. 10, the power conversion circuit includes: the first switch element, the second switch element, the third inductor, the fourth capacitor, the second transformer, the fourth diode, the fifth diode and the fifth capacitor.
Wherein, the first end of the fifth switch element and the first end of the sixth switch element are both connected with the pulse modulation control circuit, the second end of the fifth switch element and the second end of the sixth switch element are respectively connected with the first end of the third inductor, the third end of the fifth switch element is connected with the first output end of the PFC circuit, the second output end of the PFC circuit, the third end of the sixth switching element and the first end of the fourth capacitor are both grounded, the second end of the third inductor is connected with the first input end of the second transformer, the second end of the fourth capacitor is connected with the second input end of the second transformer, the first output end of the second transformer is connected with the anode of the fourth diode, the second output end of the second transformer is connected with the anode of the fifth diode, the third output end of the second transformer and the cathode of the fourth diode are connected in parallel with the fifth capacitor, and the cathode of the fourth diode is used for connecting the input end of the load.
Specifically, in the present embodiment, the fifth switching element and the sixth switching element may be transistors or field effect transistors, and the like, which is not limited in the present embodiment. The first ends of the fifth switching element and the sixth switching element are control ends, and the second end and the third end are input ends/output ends. In addition, in this embodiment, the specific types of the third inductor, the fourth capacitor, the second transformer, the fourth diode, the fifth diode, and the fifth capacitor are not limited.
Further, when the PFC circuit stops charging, the PFC control circuit may not only send the first driving signal Vg1 to stop charging to the PFC circuit, but also send the first driving signal Vg1 to the synchronization circuit, and through connection of the synchronization circuit and the pulse modulation control circuit, the synchronization circuit sends the synchronization signal to the pulse modulation control circuit, so that the pulse modulation control circuit can output the driving signal that the fifth switching element is turned on and the sixth switching element is turned off, and further, the PFC circuit charges the fourth capacitor via the third inductor. After the fourth capacitor is fully charged, the pulse modulation control circuit outputs a driving signal, so that the fifth switching element is switched off and the sixth switching element is switched on, the PFC circuit stops discharging to the third inductor and the fourth capacitor, and a process that the fourth capacitor charges the input end of the second transformer is started. The working voltage output from the output end of the second transformer is smoothed after being rectified by the fourth diode and the fifth diode, the fourth diode and the fifth diode are arranged to increase the capacity of driving a load, the fourth diode and the fifth diode are adopted to play a role in shunting, heat is reduced, the probability of damage of the two diodes is reduced greatly, and the fifth capacitor can also filter high-frequency components.
Furthermore, no matter what implementation manner is adopted by the power conversion circuit in fig. 9 or fig. 10, the driving timing sequence of charging and discharging of the PFC circuit can be controlled through the connection of the PFC control circuit, the synchronization circuit and the pulse modulation control circuit, and components in the PFC circuit cannot bear discharging current and charging current at the same time, so that ripple current is reduced, the cost of the components is reduced, and the influence on the normal operation of the power control circuit is reduced.
Further, in order to explain that the power supply control circuit in the present embodiment can reduce the ripple current, a detailed explanation is made by comparing the currents flowing through the first inductor L1, the first diode VD1, and the second capacitor C2 in the conventional power supply control circuit and the power supply control circuit in the present embodiment with reference to fig. 11A, 11B, 11C, and 12A, 12B, 12C.
Fig. 11A is a waveform diagram of a conventional power control circuit provided in the present invention, fig. 11B is a waveform diagram of a conventional power control circuit provided in the present invention, and fig. 11C is a waveform diagram of a conventional power control circuit provided in the present invention. Fig. 12A is a waveform diagram of a power control circuit provided by the present invention, fig. 12B is a waveform diagram of a power control circuit provided by the present invention, and fig. 12C is a waveform diagram of a power control circuit provided by the present invention.
Specifically, as shown in fig. 11A, in the conventional power supply control circuit, when the inductor L1 is charged, the current I1 in the inductor L1 gradually increases. When the inductor L1 discharges its stored energy to the electrolytic capacitor C2 via the diode VD1, the current I1 flowing through VD1 and C2 can keep the same trend and gradually decrease to 0. As shown in fig. 11B, in the conventional power conversion circuit, when the electrolytic capacitor C2 is charged to the power conversion circuit of the next stage, the current I2 of the electrolytic capacitor C2 and the transformer T1 may keep the same trend and gradually increase. As shown in fig. 11C, since the electrolytic capacitor C2 is subjected to the charging current I1 and the discharging current I2 at the same time, the current passing through the electrolytic capacitor C2 during one cycle is the area of the triangle abc.
Further, as shown in fig. 12A, in the power conversion circuit of the present embodiment, when the inductor L1 is charged, the current I1 on the inductor L1 gradually increases. At this time, the inductor L1 discharges to the transformer T1 in the power conversion circuit, and then discharges to the capacitor C2. Therefore, after the inductor L1 finishes charging, the current I2 of the capacitor C2 and the transformer T1 may keep the same trend and gradually increase. As shown in fig. 12B, when the energy obtained from the transformer T1 in the power conversion circuit reaches the rated power, the inductor L1 transfers the excess energy to the capacitor C2. Therefore, the currents I1-I2 flowing through VD1 and C2 can keep the same trend and gradually decrease until 0. As shown in fig. 12C, since the capacitor C2 will simultaneously bear the charging current I1 and the discharging current I2, the current passing through the capacitor C2 during one cycle is the sum of the areas of the triangle def and the triangle fmn.
Further, compared to the conventional power control circuit, since the inductor L1 does not charge the capacitor C2 first, but the inductor L1 transmits the excess energy to the capacitor C2 after the power conversion current requirement is met, the current passing through the capacitor C2 in this embodiment reduces the area of the triangle efn. Therefore, the ripple current borne by the capacitor C2 is reduced, the specification requirement on the capacitor C2 is not high, the cost is reduced, and the influence of the ripple current on the power supply control circuit is reduced.
Fig. 13 is a schematic structural diagram of an electronic device system provided in the present invention. As shown in fig. 13, the electronic device system 130 provided in this embodiment includes a power supply 1301, an electronic device 1302, and the power supply control circuit 1303 described in the foregoing embodiments. Specifically, the power supply control circuit 1303 may be provided in the power supply 1301, and the power supply control circuit 1303 may also be provided in the electronic device 1302. When the electronic device 1302 needs the power supply 1301 to supply power thereto, the power supply 1301 can supply power to the electronic device 1302 through connection with the power supply control circuit 1303. The electronic device 1302 in this embodiment may be a household appliance, an industrial appliance, or a terminal communication device.
The electronic device system 130 provided by the embodiment of the invention can be applied to various fields such as household appliances, industrial appliances or terminal communication devices. The power control circuit 1303 is connected between a power source and an electronic device (i.e., a load), and can ensure a conversion process between ac power and dc power. The electronic device system 130 provided by the embodiment of the present invention may implement the above-mentioned embodiment by using the power control circuit 1303 described above, and specific implementation principles and technical effects thereof may refer to the above-mentioned method embodiment, which is not described herein again.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A power control circuit, comprising: the device comprises a rectification filter circuit, a PFC control circuit, a synchronous circuit, a pulse modulation control circuit and a power conversion circuit;
the output end of the rectification filter circuit is connected with the input end of the PFC circuit, and the PFC control circuit is connected with the control end of the PFC circuit and used for controlling the PFC circuit to charge or stop charging;
the output end of the PFC circuit is connected with the input end of the power conversion circuit, and the control end of the power conversion circuit is connected with the pulse modulation control circuit;
the synchronous circuit is respectively connected with the PFC control circuit and the pulse modulation control circuit, and is used for sending a synchronous signal to the pulse modulation control circuit when the PFC control circuit controls the PFC circuit to stop charging so that the pulse modulation control circuit controls the power conversion circuit to charge through the PFC circuit;
when the power conversion circuit detects that the power obtained by charging through the PFC circuit reaches the rated power, the power conversion circuit is used for sending an indication signal for stopping charging to the pulse modulation control circuit, so that the pulse modulation control circuit controls the power conversion circuit not to be charged through the PFC circuit.
2. The power control circuit of claim 1, wherein the synchronization circuit comprises: a first switching element and a first resistor;
the first end of the first switching element is connected with the output end of the PFC control circuit;
the second end of the first switch element is respectively connected with the first end of the first resistor and the input end of the pulse modulation control circuit, and is used for sending the synchronous signal to the pulse modulation control circuit;
the second end of the first resistor is used for connecting a first level, and the third end of the first switch element is grounded.
3. The power control circuit according to claim 2, wherein the first switching element is a MOS transistor or a triode.
4. The power control circuit of claim 1, wherein the synchronization circuit comprises: a second switching element;
the first end of the second switching element is connected with the output end of the PFC control circuit;
and the second end of the second switching element is connected with the input end of the pulse modulation control circuit and is used for sending the synchronous signal to the pulse modulation control circuit.
5. The power supply control circuit according to claim 4, wherein the second switching element comprises: any one of an operational amplifier, a comparator, and an inverter.
6. The power control circuit of claim 1, wherein the rectifying-filtering circuit comprises: a rectifying circuit and a first capacitor;
the input end of the rectifying circuit is used for being connected with a power supply, the first output end and the second output end of the rectifying circuit are connected with the first capacitor in parallel, the first output end of the rectifying circuit is further connected with the first input end of the PFC circuit, and the second output end of the rectifying circuit and the second input end of the PFC circuit are grounded.
7. The power control circuit of claim 1, wherein the PFC circuit comprises: the first inductor, the first diode, the third switching element, the second resistor and the second capacitor;
the first output end of the rectifying filter circuit is connected with the first end of the first inductor, the second end of the first inductor is connected with the anode of the first diode, the cathode of the first diode is respectively connected with the first end of the second capacitor and the first input end of the power conversion circuit, the first end of the third switching element is connected with the PFC control circuit, the second end of the third switching element is respectively connected with the second end of the first inductor and the anode of the first diode, the third end of the third switching element is connected with the first end of the second resistor, and the second end of the second resistor, the second output end of the rectifying filter circuit, the second end of the second capacitor and the second input end of the power conversion circuit are all grounded.
8. The power control circuit of claim 1, wherein the power conversion circuit comprises: the first switch element, the first resistor, the first transformer, the second diode, the third diode, the second inductor and the third capacitor are connected in series;
wherein a first end of the fourth switching element is connected with the pulse modulation control circuit, a second end of the fourth switching element is connected with a first input end of the first transformer, a third end of the fourth switching element is connected with a first end of the third resistor, a second input end of the first transformer is connected with a first output end of the PFC circuit, a second output end of the PFC circuit and a second end of the third resistor are both grounded, a first output end of the first transformer is connected with the anode of the second diode, the cathode of the second diode is respectively connected with the cathode of the third diode and the first end of the second inductor, the second end of the second inductor is used for connecting the input end of a load, the second output end of the first transformer is connected with the anode of the third diode, the second output end of the first transformer and the second end of the second inductor are further connected with the third capacitor in parallel.
9. The power control circuit of claim 1, wherein the power conversion circuit comprises: a fifth switching element, a sixth switching element, a third inductor, a fourth capacitor, a second transformer, a fourth diode, a fifth diode, and a fifth capacitor;
wherein a first end of the fifth switching element and a first end of the sixth switching element are both connected to the pulse modulation control circuit, a second end of the fifth switching element and a second end of the sixth switching element are respectively connected to a first end of the third inductor, a third end of the fifth switching element is connected to a first output end of the PFC circuit, a second output end of the PFC circuit, a third end of the sixth switching element and a first end of the fourth capacitor are all grounded, a second end of the third inductor is connected to a first input end of the second transformer, a second end of the fourth capacitor is connected to a second input end of the second transformer, a first output end of the second transformer is connected to an anode of the fourth diode, and a second output end of the second transformer is connected to an anode of the fifth diode, and the third output end of the second transformer and the cathode of the fourth diode are connected in parallel with the fifth capacitor, and the cathode of the fourth diode is used for connecting the input end of a load.
10. An electronic device system comprising a power supply, an electronic device, and the power supply control circuit of any one of claims 1-9.
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