CN116545249A - Detection PFC power on-off locking circuit and switching power supply - Google Patents

Detection PFC power on-off locking circuit and switching power supply Download PDF

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Publication number
CN116545249A
CN116545249A CN202310814834.5A CN202310814834A CN116545249A CN 116545249 A CN116545249 A CN 116545249A CN 202310814834 A CN202310814834 A CN 202310814834A CN 116545249 A CN116545249 A CN 116545249A
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China
Prior art keywords
circuit
power
pfc
power supply
output
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CN202310814834.5A
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Chinese (zh)
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CN116545249B (en
Inventor
梅仁波
黄勇
谢红军
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Shenzhen Huikeyuan Electronic Technology Co ltd
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Shenzhen Huikeyuan Electronic Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • 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)

Abstract

The invention provides a detection PFC power on-off locking circuit and a switching power supply, wherein the switching power supply comprises a Boost power factor correction converter for realizing power factor correction and a main power converter for realizing required power supply parameters, and the detection PFC power on-off locking circuit comprises a PFC driving circuit and a PFC switch control circuit. The PFC switch control circuit is used for starting a passage between the main power supply system and the PFC driving circuit when the PFC switch control circuit detects that the output power of the output end of the switching power supply reaches the preset power, so that the PFC driving circuit chip starts working when receiving power supply, and controlling the Boost converter to work so as to perform high-power factor correction on the switching power supply. The PFC switch control circuit controls the PFC driving circuit to be locked in an on state or an off state and locked in a certain power range, so that the phenomenon of frequent on and off due to unstable output power change is avoided.

Description

Detection PFC power on-off locking circuit and switching power supply
Technical Field
The invention relates to the technical field of control circuits, in particular to a locking circuit for detecting PFC power on/off and a switching power supply.
Background
Because of the switching power supply structure of the medium-high power AC-DC, the phase difference is generated between the phase of the voltage and the phase of the current after the input voltage passes through the rectifier bridge, and if the input voltage is directly converted, harmonic current can be generated to cause harmonic voltage drop on a power grid, so that the sine wave waveform of the power grid is distorted, and the pollution to the power grid is larger. The international electrotechnical commission requires electrical equipment with output power above 75W, and the full load power factor must be greater than the PF value of 0.9 to reduce the harmonic distortion rate to reduce grid pollution. The PFC circuit is mainly used for correcting the phase difference between the voltage and the current after bridge rectification to be the same as the basic phase of the voltage and the current, and pf=1 when the current phase is completely the same as the voltage. Thereby improving the power factor of the power supply, achieving the effect of improving the utilization efficiency of electric energy, reducing the consumption of electric energy and reducing the pollution of a power grid. The PFC circuit is arranged between the bridge rectification and the load converter to correct the rectified current waveform to be the same as the phase of the input voltage so as to improve the power factor. Specifically, how much power is set for the PFC circuit to be turned on and off has a beneficial effect, and the effect of the too small power on PFC on improving the PF value is not obvious, so that the energy efficiency of a product is influenced, and the power grid pollution caused by the 40-60W on PFC is generally selected to be small, and the energy efficiency requirement of a switching power supply product can be met.
In some areas where the power grid is fragile, the voltage flicker phenomenon is very frequent, the PFC circuit on the market generally triggers an overcurrent or bus overvoltage and undervoltage fault to perform shutdown protection when the condition is met, and the PFC circuit is restarted after the fault is cleared. In addition, when the switching power supply product is in a critical output power stage, the power of the electric equipment is in critical change frequently, and the phenomenon of frequent opening and closing of a PFC circuit connected with the switching power supply product also occurs, so that the problem of repeated detection of the opening and closing of the PFC critical power of the switching power supply is caused. It should be understood that, for some charging products using gallium nitride (GaN) materials for the PFC circuit, the output power gradually decreases with increasing battery power, so that a critical power state exists, and frequent restarting of the PFC circuit may cause variation of the driving waveform of the switching power tube, so that switching noise is generated at a section of PFC critical power, and even damage to the power device of the Boost converter during severe conditions, resulting in serious consequences of product damage.
Disclosure of Invention
The invention mainly aims to provide a locking circuit for detecting the opening and closing of PFC power and a switching power supply, and aims to solve the problem that the PFC circuit is frequently opened and closed due to unstable power.
Therefore, the invention provides a locking circuit for detecting PFC power on/off, which is applied to a switching power supply, wherein the switching power supply comprises a Boost power factor correction converter, and comprises:
the main power supply system is used for accessing a direct current power supply;
the PFC driving circuit is electrically connected with the controlled end of the Boost power factor correction converter and is used for controlling the Boost power factor correction converter to be on/off so as to perform high power factor correction on the switching power supply;
the first input end of the PFC switch control circuit is electrically connected with the main power supply system, the output end of the PFC switch control circuit is electrically connected with the input end of the PFC driving circuit, and the second input end of the PFC switch control circuit is electrically connected with the output end of the Boost power factor correction converter;
the PFC switch control circuit is used for detecting the output power of the output end of the switching power supply, and controlling the direct-current power supply connected to the main power supply system to supply power to the PFC driving circuit when detecting that the output power of the output end of the switching power supply reaches the preset power, so that the PFC driving circuit controls the Boost power factor correction converter to be turned on/off.
Optionally, the PFC switch control circuit includes:
the input end of the branch switching circuit is electrically connected with the main power supply system, and the output end of the branch switching circuit is electrically connected with the input end of the PFC driving circuit; the branch switch circuit is used for switching on/off a passage between the main power supply system and the PFC driving circuit;
the power detection circuit is electrically connected with the output end of the Boost power factor correction converter; the power detection circuit is used for detecting the output power of the output end of the switching power supply and outputting a corresponding power detection signal;
the first input end of the main switch circuit is electrically connected with the output end of the Boost power factor correction converter, the second input end of the main switch circuit is electrically connected with the output end of the power detection circuit, and the output end of the main switch circuit is electrically connected with the controlled end of the branch switch circuit; the main switching circuit is used for conducting a passage between the Boost power factor correction converter and the branch switching circuit when detecting that the output power of the output end of the switching power supply reaches the preset power according to the power detection signal so as to enable the output power of the output end of the switching power supply to be output to the branch switching circuit;
And the branch switching circuit is used for conducting a passage between the main power supply system and the PFC driving circuit when receiving the output power of the output end of the switching power supply so as to enable the direct current power supply of the main power supply system to be output to the PFC driving circuit.
Optionally, the main switching circuit comprises a switching thyristor, and the branch switching circuit comprises a second MOS tube and a first MOS tube; wherein the switching thyristor has a gate, an anode and a cathode;
the controlled end of the second MOS tube is connected with the negative electrode of the switching thyristor, the input end of the second MOS tube is connected with the main power supply system, and the output end of the second MOS tube is connected with the gate electrode of the switching thyristor; the controlled end of the first MOS tube is connected with the output end of the second MOS tube, the input end of the first MOS tube is connected with a main power supply system, and the output end of the first MOS tube is connected with the input end of the PFC driving circuit.
Optionally, the power detection circuit includes a seventh resistor and a tenth resistor;
the first end of the tenth resistor is connected with the Boost power factor correction converter, the second end of the tenth resistor is connected with the first end of the seventh resistor, and the interconnection point is connected with the control end of the main switch circuit; and the second end of the seventh resistor is connected with the input end of the main switch circuit.
Optionally, the PEC drive circuit includes a PFC drive chip having an input pin and a control pin;
the input pin of the PFC driving chip is connected with the output end of the branch switching circuit, and the control pin of the PFC driving chip is connected with the controlled end of the Boost power factor correction converter.
Optionally, the detecting PFC power on-off lock circuit further includes:
and the voltage doubling rectifying circuit is connected with the output end of the Boost power factor correction converter and the input end of the power detection circuit and is used for carrying out voltage doubling rectification on the output power of the output end of the switching power supply and then outputting the output power to the power detection circuit.
Optionally, the detecting PFC power on-off lock circuit further includes:
the coupling circuit is arranged between the output end of the voltage doubling rectifying circuit and the input end of the power detection circuit and is used for coupling the voltage output by the voltage doubling rectifying circuit and outputting the coupled voltage to the power detection circuit.
Optionally, the voltage doubling rectifying circuit comprises a fourth diode and a fifth diode;
the positive pole of the fourth diode is connected with the negative pole of the fifth diode, the interconnection point of the fourth diode is connected with the output end of the Boost power factor correction converter, the negative pole of the fourth diode is connected with the positive pole of the fifth diode, and the interconnection point of the fourth diode is connected with the input end of the power detection circuit.
Optionally, the coupling circuit includes a fourth capacitor;
the first end of the fourth capacitor is connected between the output end of the voltage doubling rectifying circuit and the input end of the power detection circuit, and the second end of the fourth capacitor is grounded.
The invention provides a detection PFC power on-off locking circuit which is applied to a switching power supply. The PFC switch control circuit is used for starting a passage between the main power supply system and the PFC driving circuit when the PFC switch control circuit detects that the output power of the output end of the switching power supply reaches the preset power, so that the PFC driving circuit chip starts working when receiving power supply, and controlling the Boost converter to work so as to perform high-power factor correction on the switching power supply. The PFC switch control circuit controls the PFC driving circuit to be locked in an on state or an off state and locked in a certain power range, so that the phenomenon of frequent on and off due to unstable output power change is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit flow diagram of a circuit for detecting PFC power on/off lock circuit and switching power supply according to the present invention;
FIG. 2 is a circuit flow diagram of another embodiment of a circuit for detecting PFC power on/off lock and switching power supply according to the present invention;
fig. 3 is a circuit structure diagram of a circuit for detecting PFC power on/off locking and a switching power supply according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
It should be understood that the PFC circuit is mainly used for automatically controlling the input current of the main power supply system, so as to improve the power factor of the power supply while keeping the output power constant. The system can reduce the load of the main power supply system on a power grid and a power supply, reduce energy consumption and electric charge expenditure, and simultaneously reduce pollution and environmental influence. The PFC circuit is arranged between the main power supply system and the load to control the voltage of the filter capacitor to control the power factor of the power supply. Specifically, a bridge rectifier circuit, an inductor, a switching power tube and a filter capacitor are arranged in the PFC circuit, the PFC circuit rectifies the current input by the main power supply system through the bridge rectifier circuit and outputs direct current to the inductor, and the switching power tube is conducted, so that the inductor receives the direct current and stores energy; or cut off the switch power tube to make the inductance output direct current to the filter capacitance to adjust the voltage of the filter capacitance. When the phase difference between the current and the voltage input to the load is larger, the PFC circuit can adjust the voltage of the filter capacitor, so that the phase difference between the current and the voltage input to the load is reduced, the power factor of the power supply is improved, the voltage output to the load is constant, and the effect of improving the utilization efficiency of electric energy is achieved.
In some areas where the power grid is fragile, the voltage flicker phenomenon is very frequent, the PFC circuit on the market generally triggers an overcurrent or bus overvoltage and undervoltage fault to perform shutdown protection when the condition is met, and the PFC circuit is restarted after the fault is cleared. In addition, when the switching power supply product is in a critical output power stage, the output power of the switching power supply product is unstable, and the PFC circuit connected with the switching power supply product can be frequently turned on and off, so that the problem of repeated detection of the output power of the switching power supply is solved. It should be understood that frequent restarting of the PFC circuit causes damage to the internal components of the PFC circuit itself on the one hand, and causes a relatively large impact on the power grid on the other hand, making the power grid more fragile. For some high-power density power supply charging products, frequent restarting of the PFC circuit may cause variation in the driving waveform of the switching power tube, thereby generating switching noise, and even causing serious consequences of damage or dead halt of the switching power tube.
Therefore, the present invention proposes a circuit for detecting PFC power on-off locking, applied to a switching power supply including a Boost power factor correction converter, referring to fig. 1, comprising:
The main power supply system is used for accessing a direct current power supply;
the PFC driving circuit 20 is electrically connected with the controlled end of the Boost power factor correction converter and is used for controlling the Boost power factor correction converter to be on/off so as to perform high power factor correction on the switching power supply;
a PFC switch control circuit 10, wherein a first input end of the PFC switch control circuit 10 is electrically connected with a main power supply system, an output end of the PFC switch control circuit 10 is electrically connected with an input end of the PFC drive circuit 20, and a second input end of the PFC switch control circuit 10 is electrically connected with an output end of the Boost power factor correction converter;
the PFC switch control circuit 10 is configured to detect an output power of the output end of the switching power supply, and when detecting that the output power of the output end of the switching power supply reaches a preset power, control a dc power supply connected to the main power supply system to supply power to the PFC drive circuit 20, so that the PFC drive circuit 20 controls on/off of the Boost power factor correction converter.
It will be appreciated that the PFC drive circuit 20 is configured to control the waveform of the input current to synchronize the waveform of the input current with the waveform of the input voltage, thereby increasing the power factor, and the greater the power factor, the higher the power utilization. The switching power supply is a capacitor input type circuit, and a phase difference between a current and a voltage causes a loss of switching power, and the PFC driving circuit 20 is required to increase a power factor. The PFC driving circuit 20 of the present invention is provided between the switching power supply and the load for performing high power factor correction on the voltage of the switching power supply to keep the voltage output to the load constant, thereby improving the use efficiency of the electric energy. However, when the switching power supply is in the critical output power stage, the output power of the output end of the switching power supply is unstable, and the PFC driving circuit 20 disposed between the loads of the switching power supply is frequently turned on and off, which causes a problem of repeated detection of the output power of the switching power supply by the PFC driving circuit 20, and even causes a serious problem of damage and halt of the switching power tube in the PFC driving circuit 20.
Therefore, the present invention is further provided with the PFC switch control circuit 10 for controlling the PFC drive circuit 20 to be turned on/off according to the output power of the output terminal of the switching power supply so as to lock the PFC drive circuit 20 in the on/off state. Specifically, the PFC switch control circuit 10 may detect the output power of the output end of the switching power supply, and when detecting that the output power of the output end of the switching power supply reaches a preset value, control and turn on a path between the main power supply system and the PFC drive circuit 20, so that the voltage of the main power supply system is output to the PFC drive circuit 20, and the PFC drive circuit 20 starts to operate when receiving the required operating voltage, so as to drive the Boost power factor correction converter to be turned on, and perform high power factor correction on the switching power supply; when the PFC switch control circuit 10 detects that the output power of the output end of the switching power supply does not reach the preset value, it controls to disconnect the path between the main power supply system and the PFC drive circuit 20, the PFC drive circuit 20 stops working, and the Boost power factor correction converter is disconnected, so that the Boost power factor correction converter does not perform high power factor correction on the switching power supply.
It should be understood that the switching power supply provided by the invention is provided with a conductive interference suppression network circuit, a bridge rectifier circuit, a Boost power factor correction converter and a main power converter; the input end of the interference-guiding and suppressing network circuit is used for being connected with alternating current, the output end of the interference-guiding and suppressing network circuit is connected with the input end of the bridge rectifier circuit, the output end of the bridge rectifier circuit is connected with the input end of the Boost power factor correction converter, the controlled end of the Boost power factor correction converter is connected with the control end of the PFC driving circuit 20, the output end of the Boost power factor correction converter is connected with the primary winding of the main power converter, and the output end of the switching power supply is an auxiliary winding of the main power converter. The specific working flow is as follows: the conductive interference suppression network circuit is used for accessing alternating current, and conducting the alternating current to the bridge rectifier circuit after interference suppression; the bridge rectifier circuit rectifies the alternating current to convert the alternating current into direct current and outputs the direct current to the Boost power factor correction converter. When the PFC switch control circuit 10 detects that the output power of the output terminal of the switching power supply reaches a preset value, that is, detects that the voltage output by the auxiliary winding of the main power converter reaches a preset value, it controls the PFC drive circuit 20 to start to operate so as to drive the Boost power factor correction converter to be turned on. The Boost power factor correction converter starts to work after being conducted so as to carry out high power factor correction on direct current output by the bridge rectifier circuit. Specifically, the Boost power factor correction converter comprises an inductor, a direct-current capacitor and a rectifier diode. The inductance is used for separating the bridge rectifier circuit from the direct-current capacitor, so that the voltage between the bridge rectifier circuit and the inductance can change along with the magnitude of the input voltage, and the conduction angle of the rectifier diode is increased, so that the input current waveform is improved. I.e. an effect of increasing the power factor of the input voltage is achieved.
In practical application, a user may set a first preset power according to personal requirements, for example, the user sets the power corresponding to the first preset power to be 40W, when the PFC switch control circuit 10 detects that the output power of the output end of the switching power supply reaches 40W, the PFC switch control circuit 10 is turned on, and at this time, the Boost power factor correction converter is turned on and performs high-power factor correction on the switching power supply; in addition, the user may set a second preset power, where the second preset power may be regarded as a minimum voltage preset value of the output end of the switching power supply, for example, the user sets the second preset power to 35W, when the PFC switch control circuit 10 detects that the output power of the output end of the switching power supply decreases from 40W to 36W, since 36W is higher than the minimum voltage preset value 35W, the PFC switch control circuit 10 is still in a conductive state, and the Boost power factor correction converter is turned on and performs high power factor correction on the switching power supply; when the PFC switching control circuit 10 detects that the output power of the output terminal of the switching power supply decreases from 40W to 33W, the PFC switching control circuit 10 is turned off at this time, the PFC driving circuit 20 is turned off, and the Boost power factor correction converter is turned off because 33W is lower than the minimum voltage preset value 35W. It should be understood that once the output power of the output terminal of the switching power supply is reduced to the minimum voltage preset value, the PFC switch control circuit 10 is always in the off state, and the PFC driving circuit 20 is always in the off state, even if the output power of the output terminal of the switching power supply is again higher than the minimum voltage preset value 35w, and similarly, the Boost power factor correction converter is in the off state. And the PFC switch control circuit 10 is triggered to be conducted until the output power of the output end of the switching power supply reaches the first preset power again, namely, the output power of the output end of the switching power supply reaches 40W again, so that the PFC driving circuit 20 drives the Boost power factor correction converter again to start working, and the switching power supply is conducted/disconnected. In the invention, as long as the output power of the output end of the switching power supply is maintained within the preset range, even if the output power of the output end of the switching power supply is unstable, the working state of the PFC driving circuit 20 is not affected, thereby avoiding the phenomenon that the PFC driving circuit 20 is frequently turned on and off due to unstable power.
The invention provides a locking circuit for detecting the opening and closing of PFC power, which is applied to a switching power supply. The PFC driving circuit 20 is electrically connected to a controlled end of the Boost power factor correction converter, a first input end of the PFC switch control circuit 10 is electrically connected to the main power supply system, an output end of the PFC switch control circuit 10 is electrically connected to an input end of the PFC driving circuit 20, and a second input end of the PFC switch control circuit 10 is electrically connected to an output end of the Boost power factor correction converter. When the PFC switch control circuit 10 detects that the output power of the output end of the switching power supply reaches the preset power, a path between the main power supply system and the PFC drive circuit 20 is conducted, so that the dc power supply of the main power supply system is output to the PFC drive circuit 20; the PFC drive circuit 20 starts operating upon receiving the dc power from the main power supply system and controls the Boost power factor correction converter on/off to perform high power factor correction on the switching power supply. The PFC switch control circuit 10 controls the PFC driving circuit 20 to be locked in an on state or an off state, so that the phenomenon that the PFC driving circuit 20 is frequently turned on and off due to unstable power is avoided.
In an embodiment, the PFC switch control circuit 10 is further configured to control the dc power supply connected to the main power supply system to stop supplying power to the PFC drive circuit 20 when detecting that the output power of the output terminal of the switching power supply is lower than a second preset power.
It will be appreciated that the first preset power may be considered as a voltage value that triggers the PFC switch control circuit 10 to switch on the path between the main power supply system and the PFC drive circuit 20, and the second preset power may be considered as a voltage value that triggers the PFC switch control circuit 10 to switch off the path between the main power supply system and the PFC drive circuit 20. Specifically, when the PFC switch control circuit 10 detects that the output power of the output end of the switching power supply reaches the first preset power, the dc power supply connected to the main power supply system is output to the PFC driving circuit 20 through the PFC switch control circuit 10, so that the PFC driving circuit 20 starts to work and turns on the Boost power factor correction converter, and the control circuit starts to perform high power factor correction on the switching power supply. On the other hand, when the PFC switch control circuit 10 detects that the output power at the output end of the switching power supply starts to decrease and decreases to be lower than the second preset power, the PFC switch control circuit 10 controls to disconnect the path between the main power supply system and the PFC drive circuit 20, and the dc power supply connected to the main power supply system cannot be output to the PFC drive circuit 20 through the PFC switch control circuit 10, and the PFC drive circuit stops working.
In practical application, the explanation will be given taking an example in which the user sets the power corresponding to the first preset power to 40W and the power corresponding to the second preset power to 35W. Specifically, when the PFC switch control circuit 10 detects that the output power of the output terminal of the switching power supply decreases from 40W to 36W, since 36W is higher than the second preset power 35W, the PFC switch control circuit 10 is still in the on state, and the Boost power factor correction converter is turned on and performs high power factor correction on the switching power supply. When the PFC switching control circuit 10 detects that the output power of the output terminal of the switching power supply decreases from 40W to 33W, since 33W is lower than the second preset power 35W, the PFC switching control circuit 10 is turned off, the PFC driving circuit 20 is turned off, and the Boost power factor correction converter is turned off. It should be understood that once the output power of the output terminal of the switching power supply is reduced to the second preset power, the PFC switch control circuit 10 is always in the off state, and the PFC drive circuit 20 is always in the off state, even if the output power of the output terminal of the switching power supply is again higher than the second preset power 35w, as such. And the PFC switch control circuit 10 is triggered to be conducted until the output power of the output end of the switching power supply reaches the first preset power again, namely, the output power of the output end of the switching power supply reaches 40W again, so that the PFC driving circuit 20 drives the Boost power factor correction converter again to start working. The PFC switch control circuit 10 controls the PFC driving circuit 20 to be locked in an on state or an off state, so that the phenomenon that the PFC driving circuit 20 is frequently turned on and off due to unstable power is avoided.
Referring to fig. 3, when the output power of the output end of the switching power supply is lower than the power corresponding to the second preset power, it can be understood that when the output power of the output end of the switching power supply is reduced to the point P1, the voltage flowing through the ninth resistor R9 cannot maintain the gate voltage of the switching thyristor TV3, at this time, the switching thyristor TV3 is turned off, the second MOS transistor TV2 and the first MOS transistor TV1 are turned off due to the turning off of the switching thyristor TV3, the PFC switch control circuit 10 cuts off the path between the current end and the PFC drive circuit 20, and the PFC drive circuit 20 loses power to stop working. When the second MOS tube TV2 is cut off, the gate electrode of the switching thyristor TV3 loses the voltage maintenance of the ninth resistor R9, so that the switching thyristor TV3 enters a closing and locking state, and the PFC driving circuit is controlled to be locked in the closing state.
In one embodiment, referring to fig. 2, the PFC switch control circuit 10 includes:
a branch switch circuit 130, wherein an input end of the branch switch circuit 130 is electrically connected with a main power supply system, and an output end of the branch switch circuit 130 is electrically connected with an input end of the PFC driving circuit 20; the bypass switching circuit 130 is configured to switch on/off a path between the main power supply system and the PFC driving circuit 20;
The power detection circuit 110 is electrically connected with the output end of the Boost power factor correction converter; the power detection circuit 110 is configured to detect an output power of the output terminal of the switching power supply, and output a corresponding power detection signal;
a main switch circuit 120, wherein a first input end of the main switch circuit 120 is electrically connected with an output end of the Boost power factor correction converter, a second input end of the main switch circuit 120 is electrically connected with an output end of the power detection circuit 110, and an output end of the main switch circuit 120 is electrically connected with a controlled end of the branch switch circuit 130; the main switch circuit 120 is configured to, according to the power detection signal, detect that the output power of the output end of the switching power supply reaches a preset power, turn on a path between the Boost power factor correction converter and the branch switch circuit 130, so that the output power of the output end of the switching power supply is output to the branch switch circuit 130;
the bypass switch circuit 130 is configured to, when receiving the output power of the output terminal of the switch power supply, switch on a path between the main power supply system and the PFC driving circuit 20, so that the dc power supply of the main power supply system is output to the PFC driving circuit 20.
It will be appreciated that the PFC switch control circuit 10 includes a power detection circuit 110 for detecting the output power of the output terminal of the switching power supply, a main switching circuit 120 for switching on/off the path between the Boost power factor correction converter and the branch switching circuit 130, and a branch switching circuit 130 for switching on/off the path between the main power supply system and the PFC drive circuit 20. The main power supply system is mainly used for providing an operating voltage for the PFC driving circuit 20. In practical application, the power detection circuit 110 detects the output power of the output end of the switching power supply, and outputs the detection result to the main switching circuit 120 in the form of a power detection signal, and when the main switching circuit 120 detects that the output power of the output end of the switching power supply reaches the preset power according to the power detection signal, the path between the Boost power factor correction converter and the branch switching circuit 130 is controlled to be conducted, so that the output power of the output end of the switching power supply is output to the branch switching circuit 130 through the main switching circuit 120; the bypass switch circuit 130 receives the output power of the output end of the switch power supply, and then controls and switches on the channel between the main power supply system and the PFC driving circuit 20, the direct current power supply output by the main power supply system is output to the PFC driving circuit 20 through the bypass switch circuit 130, and the PFC driving circuit 20 receives the direct current power supply of the main power supply system and starts working to control the Boost power factor correction converter to switch on/off so as to perform high power factor correction on the switch power supply.
In an embodiment, referring to fig. 3, the main switch circuit 120 includes a switch thyristor TV3, and the branch switch circuit 130 includes a second MOS transistor TV2 and a first MOS transistor TV1;
wherein the switching thyristor TV3 has a gate, an anode and a cathode;
the controlled end of the second MOS tube TV2 is connected with the negative electrode of the switching thyristor TV3, the input end of the second MOS tube TV2 is connected with a main power supply system, and the output end of the second MOS tube TV2 is connected with the gate electrode of the switching thyristor TV 3; the controlled end of the first MOS tube TV1 is connected with the output end of the second MOS tube TV2, the input end of the first MOS tube TV1 is connected with a main power supply system, and the output end of the first MOS tube TV1 is connected with the input end of the PFC driving circuit 20.
It is understood that the branch switching circuit 130 in the present embodiment further includes a sixth resistor R6, a ninth resistor R9, and an eleventh resistor R11. In practical application, when the power detection circuit 110 outputs a power detection signal to the main switch circuit 120, the gate electrode of the switch thyristor TV3 receives the power detection signal, the switch thyristor TV3 is in a conducting state when the current voltage reaches the preset power according to the detection of the power detection signal, and the voltage output by the main power supply system sequentially passes through the input end of the second MOS tube TV2, the controlled end of the second MOS tube TV2, the sixth resistor R6, the cathode of the switch thyristor TV3, and finally is output to the ground end. At this time, the controlled end of the second MOS transistor TV2 is in a conducting state due to the current pull-down of the sixth resistor R6, and at the same time, the voltage output from the output end of the second MOS transistor TV2 passes through the ninth resistor R9 and the eleventh resistor R11, so as to respectively transmit the voltage to the positive electrode of the switching thyristor TV3 and the controlled end of the first MOS transistor TV 1. At this time, the controlled end of the first MOS transistor TV1 is in a conductive state due to the rise of the electric potential, and at the same time, the voltage output by the main power supply system sequentially passes through the input end of the first MOS transistor TV1 and the output end of the first MOS transistor TV1 to be output to the input end of the PFC driving circuit 20, so that the PFC driving circuit 20 starts to operate.
In one embodiment, referring to fig. 3, the power detection circuit 110 includes a seventh resistor R7 and a tenth resistor R10;
the first end of the tenth resistor R10 is connected to the Boost power factor correction converter, the second end of the tenth resistor R10 is connected to the first end of the seventh resistor R7, and the interconnection point is connected to the control end of the main switch circuit 120; a second terminal of the seventh resistor R7 is connected to the input terminal of the main switch circuit 120.
It is understood that the power detection circuit 110 in this embodiment is implemented with the seventh resistor R7 and the tenth resistor R10. In practical application, the output power of the output end of the switching power supply sequentially passes through the tenth resistor R10 and the seventh resistor R7, the output power of the output end of the switching power supply is divided according to the resistance ratio of the tenth resistor R10 and the seventh resistor R7, the divided voltage is output to the input end of the total switching circuit 120, the total switching circuit 120 obtains the divided voltage value, and the voltage value of the output end of the switching power supply is detected according to the preset resistance ratio. The main switching circuit 120 controls on/off of a path between the Boost power factor correction converter and the branch switching circuit 130 according to the detected voltage value.
In one embodiment, referring to fig. 3, the PEC driving circuit includes a PFC driving chip U1 having an input pin VCC and a control pin Gate;
an input pin VCC of the PFC driving chip U1 is connected to an output end of the bypass switching circuit 130, and a control pin Gate of the PFC driving chip U1 is connected to a controlled end of the Boost power factor correction converter.
It can be understood that the main switch circuit 120 controls and turns on the path between the Boost power factor correction converter and the branch switch circuit 130 when the voltage at the output end of the switch power supply reaches the preset power according to the power detection signal of the power detection circuit 110, and the output power at the output end of the switch power supply is output to the branch switch circuit 130 through the main switch circuit 120. The bypass switch circuit 130 receives the output power of the output end of the switch power supply, and then controls and conducts the passage between the main power supply system and the PFC driving chip U1, the direct current power supply output by the main power supply system is output to the input pin VCC of the PFC driving chip U1 through the bypass switch circuit 130, and the PFC driving chip U1 is electrified and starts working. When the PFC driving chip U1 is in a working state, a control signal is output to the Boost power factor correction converter through a control pin Gate so as to control the Boost power factor correction converter to be conducted, and high-power factor correction is carried out on a switching power supply.
In an embodiment, the detecting PFC power on/off lock circuit further includes a voltage doubler rectifier circuit connected to an output terminal of the Boost power factor correction converter and an input terminal of the power detection circuit 110, and configured to output the output power of the output terminal of the switching power supply to the power detection circuit 110 after voltage doubler rectification.
It will be appreciated that when an ac voltage is input to the main power converter, the main power converter transforms the voltage to a higher voltage and then inputs the higher voltage to the rectifying diode, which converts the ac voltage to a dc voltage and the dc voltage to a double voltage, whereby the voltage doubler rectifying circuit can achieve the effect of converting the input ac voltage to a double dc voltage. In practical application, the output end of the switching power supply outputs an ac voltage, and the voltage doubler rectifying circuit receives the ac voltage of the output end of the switching power supply and outputs the ac voltage to the power detecting circuit 110 after voltage doubler rectification.
In an embodiment, the detecting PFC power on/off lock circuit further includes a coupling circuit disposed between the output end of the voltage doubler rectifying circuit and the input end of the power detecting circuit 110, and configured to couple the voltage output from the voltage doubler rectifying circuit and output the coupled voltage to the power detecting circuit 110.
It can be understood that the coupling circuit is mainly used for coupling and isolating the strong current at the output end of the switching power supply and the weak current of the FPC switch control circuit 10 so as to provide a high-frequency signal path, prevent the low-frequency current from entering the weak current system and ensure personal safety. Alternatively, the coupling circuit may be implemented by direct coupling, capacitive coupling, electromagnetic inductive coupling, common impedance coupling, or the like. In this embodiment, a capacitive coupling mode is adopted, and after the dc voltage output by the voltage doubler rectifying circuit is coupled, a stable dc voltage is output to the power detection circuit 110.
In an embodiment, referring to fig. 3, the voltage doubler rectification circuit includes a fourth diode D4 and a fifth diode D5;
the anode of the fourth diode D4 is connected to the cathode of the fifth diode D5, the interconnection point thereof is connected to the output terminal of the Boost power factor correction converter, the cathode of the fourth diode D4 is connected to the anode of the fifth diode D5, and the interconnection point thereof is connected to the input terminal of the power detection circuit 110.
It can be understood that the voltage doubler rectifying circuit in this embodiment is implemented by using the fourth diode D4 and the fifth diode D5. In addition, the switching power supply further includes a main power converter, the auxiliary winding of the main power converter outputs an ac voltage to the voltage doubling rectifying circuit through the output end of the switching power supply, and the ac voltage is output to the power detecting circuit 110 after the ac voltage is voltage doubling rectified by the fourth diode D4 and the fifth diode D5, and the fourth diode D4 and the fifth diode D5 respectively.
In one embodiment, referring to fig. 3, the coupling circuit includes a fourth capacitor C4;
the first end of the fourth capacitor C4 is connected between the output end of the voltage doubling rectifying circuit and the input end of the power detecting circuit 110, and the second end of the fourth capacitor C4 is grounded.
It will be appreciated that the coupling circuit in this embodiment includes a fourth capacitance C4. Specifically, the voltage doubler rectifier circuit doubles and rectifies the ac voltage at the output end of the switching power supply, and outputs a corresponding dc voltage to the coupling circuit, and the fourth capacitor C4 in the coupling circuit couples the dc voltage and outputs a stable dc voltage to the power detection circuit 110.
The invention also provides a switching power supply, referring to fig. 3, comprising a Boost power factor correction converter and the detection PFC power on-off locking circuit, wherein the controlled end of the Boost power factor correction converter is electrically connected with the detection PFC power on-off locking circuit.
It is understood that a Boost power factor correction converter for correcting the power factor is included in the switching power supply. Specifically, when detecting that the output power of the output end of the switching power supply reaches a preset value, the PFC switch control circuit 10 controls and turns on a path between the main power supply system and the PFC driving circuit 20, so that the PFC driving circuit 20 is turned on. In addition, the PFC driving chip U1 in the PFC driving circuit 20 has a control pin Gate, and when the PFC driving circuit 20 is turned on, the control pin Gate of the PFC driving chip U1 outputs a control signal to the Boost power factor correction converter, and the Boost power factor correction converter is turned on after receiving the control signal, so as to perform high power factor correction on the switching power supply.
The foregoing description of the preferred embodiments of the present invention should not be construed as limiting the scope of the invention, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).

Claims (10)

1. A detection PFC power on-off lock circuit for use with a switching power supply including a Boost power factor correction converter, comprising:
the main power supply system is used for accessing a direct current power supply;
the PFC driving circuit is electrically connected with the controlled end of the Boost power factor correction converter and is used for controlling the Boost power factor correction converter to be on/off so as to perform high power factor correction on the switching power supply;
the first input end of the PFC switch control circuit is electrically connected with the main power supply system, the output end of the PFC switch control circuit is electrically connected with the input end of the PFC driving circuit, and the second input end of the PFC switch control circuit is electrically connected with the output end of the Boost power factor correction converter;
the PFC switch control circuit is used for detecting the output power of the output end of the switching power supply, and controlling the direct-current power supply connected to the main power supply system to supply power to the PFC driving circuit when detecting that the output power of the output end of the switching power supply reaches a first preset power, so that the PFC driving circuit controls the Boost power factor correction converter to be turned on/off.
2. The PFC switch control circuit of claim 1 further configured to control the dc power source connected to the main power supply system to stop supplying power to the PFC drive circuit when the PFC switch control circuit detects that the output power at the output terminal of the switching power supply is lower than a second predetermined power.
3. The detecting PFC power on-off lock circuit of claim 1, wherein the PFC switch control circuit comprises:
the input end of the branch switching circuit is electrically connected with the main power supply system, and the output end of the branch switching circuit is electrically connected with the input end of the PFC driving circuit; the branch switch circuit is used for switching on/off a passage between the main power supply system and the PFC driving circuit;
the power detection circuit is electrically connected with the output end of the Boost power factor correction converter; the power detection circuit is used for detecting the output power of the output end of the switching power supply and outputting a corresponding power detection signal;
the first input end of the main switch circuit is electrically connected with the output end of the Boost power factor correction converter, the second input end of the main switch circuit is electrically connected with the output end of the power detection circuit, and the output end of the main switch circuit is electrically connected with the controlled end of the branch switch circuit; the main switching circuit is used for conducting a passage between the Boost power factor correction converter and the branch switching circuit when detecting that the output power of the output end of the switching power supply reaches the preset power according to the power detection signal so as to enable the output power of the output end of the switching power supply to be output to the branch switching circuit;
And the branch switching circuit is used for conducting a passage between the main power supply system and the PFC driving circuit when receiving the output power of the output end of the switching power supply so as to enable the direct current power supply of the main power supply system to be output to the PFC driving circuit.
4. The detecting PFC power on-off lock circuit of claim 3, wherein the main switch circuit comprises a switch thyristor, and wherein the bypass switch circuit comprises a second MOS transistor and a first MOS transistor; wherein the switching thyristor has a gate, an anode and a cathode;
the controlled end of the second MOS tube is connected with the negative electrode of the switching thyristor, the input end of the second MOS tube is connected with the main power supply system, and the output end of the second MOS tube is connected with the gate electrode of the switching thyristor; the controlled end of the first MOS tube is connected with the output end of the second MOS tube, the input end of the first MOS tube is connected with a main power supply system, and the output end of the first MOS tube is connected with the input end of the PFC driving circuit.
5. The detecting PFC power on-off lock circuit according to claim 3, wherein the power detection circuit comprises a seventh resistor and a tenth resistor;
The first end of the tenth resistor is connected with the Boost power factor correction converter, the second end of the tenth resistor is connected with the first end of the seventh resistor, and the interconnection point is connected with the control end of the main switch circuit; and the second end of the seventh resistor is connected with the input end of the main switch circuit.
6. The detecting PFC power on-off lock circuit of claim 3, further comprising:
and the voltage doubling rectifying circuit is connected with the output end of the Boost power factor correction converter and the input end of the power detection circuit and is used for carrying out voltage doubling rectification on the output power of the output end of the switching power supply and then outputting the output power to the power detection circuit.
7. The detecting PFC power on-off lock circuit according to claim 6, further comprising:
the coupling circuit is arranged between the output end of the voltage doubling rectifying circuit and the input end of the power detection circuit and is used for coupling the voltage output by the voltage doubling rectifying circuit and outputting the coupled voltage to the power detection circuit.
8. The PFC power on-off detection lockout circuit according to claim 6, wherein the voltage doubler rectifier circuit includes a fourth diode and a fifth diode;
The positive pole of the fourth diode is connected with the negative pole of the fifth diode, the interconnection point of the fourth diode is connected with the output end of the Boost power factor correction converter, the negative pole of the fourth diode is connected with the positive pole of the fifth diode, and the interconnection point of the fourth diode is connected with the input end of the power detection circuit.
9. The detecting PFC power on-off lock circuit of claim 7, wherein the coupling circuit comprises a fourth capacitor;
the first end of the fourth capacitor is connected between the output end of the voltage doubling rectifying circuit and the input end of the power detection circuit, and the second end of the fourth capacitor is grounded.
10. A switching power supply comprising a Boost power factor correction converter and a detected PFC power on-off locking circuit according to any one of claims 1 to 9, wherein a controlled end of the Boost power factor correction converter is electrically connected to the detected PFC power on-off locking circuit.
CN202310814834.5A 2023-07-05 2023-07-05 Detection PFC power on-off locking circuit and switching power supply Active CN116545249B (en)

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CN112671224A (en) * 2021-01-14 2021-04-16 上海军陶科技股份有限公司 PFC (Power factor correction) frequency conversion control method, device and controller
CN115149623A (en) * 2021-03-16 2022-10-04 Gan系统公司 Architecture for a multi-port AC/DC switching power supply

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US5617013A (en) * 1994-06-13 1997-04-01 Bull Hn Information Systems Italia S.P.A. Power supply with power factor correction and protection against failures of the power factor correction
CN101325367A (en) * 2007-06-14 2008-12-17 海尔集团公司 Circuit for correcting part active power factor
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