CN114884322A - Power control circuit, switching power supply and electrical equipment - Google Patents
Power control circuit, switching power supply and electrical equipment Download PDFInfo
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- CN114884322A CN114884322A CN202210381008.1A CN202210381008A CN114884322A CN 114884322 A CN114884322 A CN 114884322A CN 202210381008 A CN202210381008 A CN 202210381008A CN 114884322 A CN114884322 A CN 114884322A
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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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Abstract
The invention discloses a power control circuit for improving standby power consumption, a switching power supply and electrical equipment, wherein the power control circuit comprises a regulation module and a driving control module, the regulation module comprises an optocoupler current sampling unit, a standby state detection unit, an optocoupler current regulation unit and an addition unit, the current flowing through an optocoupler is detected in real time by the optocoupler current sampling unit and compensated by the optocoupler current regulation unit, the current is regulated and controlled by the addition unit to output an optocoupler current regulation value, the standby state detection unit judges whether the power circuit is in a standby mode or not according to the optocoupler current regulation value, if the power circuit is in the standby mode, the optocoupler current regulation unit outputs a compensation current value to the addition unit so as to reduce the detection current value output by the optocoupler current sampling unit, and the aim of reducing the optocoupler current is achieved. The output optocoupler current is adjusted through the power control circuit, and the problem that the standby loss is large due to the fact that the optocoupler current rises along with the reduction of the output power of the switching power supply is solved.
Description
Technical Field
The present application relates to the field of power supplies, and in particular, to a power control circuit, a switching power supply, and an electrical device for improving standby power consumption.
Background
In general isolation power supply, the optical coupling isolation feedback is a simple, low-cost mode, isolation type power supply can adopt the optical coupling feedback circuit who comprises opto-coupler and TL431 to carry out the output feedback usually, however, the opto-coupler electric current can reduce and rise along with switching power supply's output, when the output is unloaded, the opto-coupler electric current reaches the maximum value, it is great because of the opto-coupler electric current this time, the power control chip that leads to driving power switch pipe and the loss of opto-coupler feedback circuit reach the biggest, lead to standby power consumption higher.
Disclosure of Invention
Based on this, the embodiment of the invention provides a power control circuit for improving standby power consumption, a switching power supply and electrical equipment, and solves the problem of excessive loss caused by increase of current of an optical coupler when the switching power supply is in light load or no load.
In order to solve the technical problems, the power control circuit for improving the standby power consumption has the following specific technical scheme that the power control circuit for improving the standby power consumption comprises a regulation module and a drive control module, wherein the drive control module is electrically connected with the regulation module and is used for being electrically connected with a power switching tube so as to control the power of the power circuit;
the control module comprises an optocoupler current sampling unit, a standby state detection unit, an optocoupler current regulation unit and an addition unit, wherein the optocoupler current sampling unit is used for being electrically connected with an optocoupler of an optocoupler feedback circuit, the standby state detection unit is electrically connected with the optocoupler current regulation unit, the optocoupler current regulation unit and the optocoupler current sampling unit are respectively electrically connected with the addition unit so as to regulate and control a compensation current value output by the optocoupler current regulation unit and a detection current value sampled by the optocoupler current sampling unit through the addition unit, and the output end of the addition unit is respectively electrically connected with the standby state detection unit and the drive control module so as to output an optocoupler current regulation value regulated and controlled by the addition unit to the standby state detection unit and the drive control module;
the standby state detection unit judges whether the power circuit is in a standby mode or not according to the optocoupler current regulation value, if the power circuit is in the standby mode, the optocoupler current regulation unit outputs a compensation current value to the addition unit so as to reduce the detection current value, the optocoupler current regulation value output by the addition unit is equal to the sum of the detection current value and the compensation current value, and the compensation current value is greater than 0 in the standby mode.
Preferably, the compensation current value is gradually increased to the target compensation current value after the power circuit enters the standby mode, the compensation current value is kept unchanged after the compensation current value reaches the target compensation current value, the optocoupler current regulation value changes along with the change of the detection current value, and the compensation current value is gradually decreased to 0 after the power circuit exits the standby mode.
Preferably, the compensation current value increases linearly or decreases linearly.
Preferably, the detected current value and the compensated current value are characterized by a voltage signal.
Preferably, the power control circuit is a power control chip.
Preferably, before the power circuit enters the standby mode, the compensation current value is 0, the detection current value output by the optocoupler current sampling unit increases with the decrease of the output power of the power circuit, and the detection current value output by the optocoupler current sampling unit decreases with the increase of the output power of the power circuit.
Preferably, the standby state detection unit is provided with a first preset current threshold and a second preset current threshold, if the optocoupler current regulation value is greater than or equal to the first preset current threshold, the standby state detection unit judges that the power circuit enters the standby mode, if the optocoupler current regulation value is less than or equal to the second preset current threshold, the standby state detection unit judges that the power circuit exits the standby mode, and the first preset current threshold is greater than the second preset current threshold.
Preferably, in the standby mode of the power circuit, the compensation current value is gradually increased to a target compensation current value, the detection current value is correspondingly decreased, and the optocoupler current regulation value is equal to the superposition of the detection current value and the compensation current value; alternatively, the first and second electrodes may be,
in the standby mode, the compensation current value is equal to the target compensation current value, the detection current value is reduced along with the increase of the output power of the power circuit, and the optocoupler current regulation value is reduced accordingly.
Another embodiment of the present invention provides a switching power supply, which includes the aforementioned power control circuit for improving the standby power consumption of the power supply, and further includes a power switch tube, wherein the driving control module is electrically connected to the power switch tube, and the power switch tube is used for being electrically connected to the power circuit.
Another embodiment of the present invention provides an electrical apparatus, including the aforementioned switching power supply, further including a power circuit and an optocoupler feedback circuit, where the power circuit is electrically connected to a power switch tube of the switching power supply, the power circuit is further electrically connected to the optocoupler feedback circuit, the optocoupler feedback circuit includes an optocoupler, and an output end of the optocoupler is electrically connected to the optocoupler current sampling unit.
The invention has the following beneficial effects that the invention discloses a power control circuit for improving standby power consumption, a switching power supply and electrical equipment, wherein the power control circuit comprises a regulation and control module and a driving control module, the regulation and control module comprises an optocoupler current sampling unit, a standby state detection unit, an optocoupler current regulation unit and an addition unit, the current flowing through the optocoupler is detected in real time by the optocoupler current sampling unit and compensated by the optocoupler current regulation unit, the current is regulated and controlled by the addition unit to output an optocoupler current regulation value, the standby state detection unit judges whether the power circuit is in a standby mode according to the optocoupler current regulation value, if the power circuit is in the standby mode, the optocoupler current regulation unit outputs a compensation current value to the addition unit so as to reduce the detection current value sampled by the optocoupler current sampling unit, thereby achieving the purpose of reducing the optocoupler current value, the problem that the current of an optical coupler of the circuit rises along with the reduction of output power, and when the output is in no-load, the current of the optical coupler reaches the maximum value, and the standby loss is large is solved; the output optocoupler current is adjusted through the power control circuit, and when the optocoupler enters a standby state, the optocoupler current is superposed with a compensation current value to reduce the optocoupler current and reduce standby power consumption.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a typical circuit diagram of a switching power supply of the present invention;
fig. 2 is a typical circuit diagram of an embodiment of the optocoupler feedback circuit 2 shown in fig. 1 according to the invention;
FIG. 3 is a block circuit diagram of one embodiment of the power control circuit 3 shown in FIG. 1 according to the present invention;
fig. 4 is a specific working waveform diagram of the regulation module 30 shown in fig. 3 for regulating the current of the optocoupler.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "comprising" and "having," and any variations thereof, as appearing in the specification, claims and drawings of this application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
In order to better understand the technical scheme, the technical scheme is described in detail in the following with reference to the attached drawings of the specification and specific embodiments.
Fig. 1 is a typical circuit block diagram of a switching power supply according to the present invention, where the switching power supply includes a power circuit 1, an optocoupler feedback circuit 2, a power control circuit 3, a power switch tube 4, an input terminal Vin, and an output terminal Vout, and the power control circuit 3 includes a regulation module 30 and a driving control module 40. Output Vout of switching power supply and opto-coupler feedback circuit 2's input, the load circuit electricity is connected, opto-coupler feedback circuit 2's output is connected with regulation and control module 30's input electricity, regulation and control module 30's output is connected with drive control module 40 electricity, drive control module 40's output is connected with power switch tube 4's control end electricity, power switch tube 4 is connected with power circuit 1 electricity, drive control module 40 control power switch tube 4 switch on and cut off to drive power circuit 1 work.
The optocoupler feedback circuit 2 generally comprises an optocoupler and a controllable voltage-stabilizing source (such as a zener diode), commonly used for feedback has the optocoupler types of TLP521, PC817 and the like, here, the optocoupler U1 with the optocoupler type of TLP521 is taken as an example, and fig. 2 is a typical circuit diagram of a common feedback circuit consisting of the optocoupler U1 with the optocoupler type of TLP521 and a controllable voltage-stabilizing source TL431U 2. As shown in fig. 2, Vout is an output voltage of the switching power supply, Vdd is a supply voltage of a power control chip (not shown in the figure and described later) of the switching power supply, Vfb signal corresponds to the optical coupler detection current, the ground on the left is a power control chip supply voltage ground, the ground on the right is an output voltage ground of the switching power supply, and the two are isolated by optical coupler. The TL431U2 has three pins, namely a control pin 1, a cathode pin 2 and an anode pin 3, the internal reference voltage of the TL431U2 is Vref, a compensation network is formed by a resistor R3 and a capacitor C1, TL431U2 is compensated, and resistors R1 and R2 are divided to sample voltage.
When the load is increased, the output voltage Vout of the switching power supply is reduced, the feedback voltage obtained by dividing the voltage by the resistor R1 and the resistor R2 is also reduced, and the reference voltage VREF connected to the control pin 1 of the TL431U2 is also reduced, so that the voltage drop of the cathode pin 2 and the anode pin 3 of the TL431U2 is increased, the current is reduced, the primary current of the optocoupler is reduced, the secondary current of the optocoupler is also reduced, and the power consumption of the power control chip of the switching power supply is also reduced. On the contrary, when the load is reduced, the output voltage Vout of the switching power supply is increased, the feedback voltage obtained by dividing the voltage by the resistor R1 and the resistor R2 is also increased, and the reference voltage VREF connected to the control pin 1 of the TL431U2 is also increased, so that the voltage drop and the current of the cathode pin 2 and the anode pin 3 of the TL431U2 are reduced, the primary current of the optocoupler is increased, the secondary current of the optocoupler is also increased, and the power consumption of the power control chip of the switching power supply and the power consumption of the optocoupler feedback circuit 2 are also increased.
Along with switching power supply's output power P descends, the opto-coupler current that opto-coupler U1 exported increases gradually, and switching power supply's power control chip's consumption also increases gradually, and when switching power supply output was unloaded, because of the power control chip of opto-coupler current lead to switching power supply, opto-coupler feedback circuit 2's consumption also reached the biggest. In order to reduce the power consumption of the power control chip of the switching power supply and the power consumption of the optical coupling feedback circuit 2 during no-load, the regulation and control module 30 regulates the optical coupling current output by the optical coupling feedback circuit 2, so that when the output power P of the switching power supply is in a stable state, the optical coupling current is reduced, and the power consumption of the power control chip of the switching power supply and the power consumption of the optical coupling feedback circuit 2 are further reduced.
Further, the regulation and control module 30 includes an optical coupler current sampling unit 31, a standby state detection unit 32, an optical coupler current regulation unit 33 and an addition unit 34, as shown in fig. 1 and fig. 3, fig. 3 is a circuit block diagram of the power control circuit 3 of the present invention, the power control circuit 3 includes a regulation and control module 30 and a driving control module 40, an input end of the optical coupler current sampling unit 31 of the regulation and control module 30 is connected with an output end of an optical coupler U1 in the optical coupler feedback circuit 2, the optical coupler current sampling unit 31 includes a resistor located between an output end of an optical coupler U1 and a power supply voltage VDD in fig. 2, an output end of the optical coupler current sampling unit 31 and an output end of the optical coupler current regulation unit 33 are respectively electrically connected with the addition unit 34, an output end of the addition unit 34 is used for connecting the driving control module 40, the driving control module 40 is electrically connected with a control end of the power switch tube 4, the driving control module 40 controls the power switch tube 4 to be turned on and turned off, the output end of the adding unit 34 is further electrically connected to the standby state detecting unit 32, so as to output the optocoupler current regulation value I3 output by the adding unit 34 to the standby state detecting unit 32, the output end of the standby state detecting unit 32 is connected to the input end of the optocoupler current regulating unit 33, the optocoupler current regulation value I3 is compared with the first preset current threshold I31 or the second preset current threshold I32 by the standby state detecting unit 32, and it is determined whether the power circuit is in the standby mode and outputs a signal indicating whether the current is regulated to the optocoupler current regulating unit 33, where the first preset current threshold I31 is greater than the second preset current threshold I32.
Specifically, the adjustment and control module 30 adjusts the optical coupling current by:
the optical coupler current sampling unit 31 samples optical coupler current flowing through an optical coupler U1 in the optical coupler feedback circuit 2 in real time, and transmits a sampled detection current value I1 to the adding unit 34, the detection current value I1 outputs an optical coupler current regulation value I3 after being acted by the adding unit 34, the standby state detection unit 32 detects the optical coupler current regulation value I3, the optical coupler current regulation value I3 is compared with a preset first preset current threshold value I31, and the standby state detection unit 32 judges whether the power circuit 1 enters a standby mode or not according to a comparison result and outputs a signal whether the power circuit enters the standby mode or not to the optical coupler current regulation unit 33. When the load is lightened, the output power P is reduced, the detection current value I1 is increased, and the optocoupler current regulation value I3 is also increased, when the output power P is reduced to a certain value, the power circuit 1 enters a standby mode, at this time, the optocoupler current regulation value I3 is increased to be greater than or equal to a first preset current value I31, the standby state detection unit 32 knows that the power circuit 1 enters the standby mode at this time, and the standby state detection unit 32 outputs a first signal for current compensation to the optocoupler current adjustment unit 33; the optical coupler current adjusting unit 33 adjusts the optical coupler current according to the received first signal.
When the power circuit 1 enters the standby mode, the optocoupler current adjustment unit 33 outputs the compensation current value I2, and the detection current value I1 and the compensation current value I2 are superimposed by the addition unit 34 and output to the input end of the driving control module 40. After the optical coupler current adjusting unit 33 performs current compensation, the current at the input end of the driving control module 40 is also increased, the load at the output end of the switching power supply is unchanged, and in order to keep energy balance, the optical coupler feedback circuit 2 adjusts the optical coupler current to be small, so that the optical coupler current adjusting value I3 which is input to the driving control module 40 after the detection current value I1 and the compensation current value I2 are overlapped is equal to the optical coupler current before adjustment, and the input end of the driving control module 40 recovers to the initial value. At this time, the regulated optocoupler current is reduced, and the power consumption of the power control circuit 3 and the power consumption of the optocoupler feedback circuit 2 are also reduced accordingly.
In the standby mode, the compensation current value I2 is gradually increased to a target compensation current value I21, the target compensation current value I21 is a compensated maximum current value, and the detection current value I1 is decreased along with the increase of the compensation current value I2, so that the optocoupler current regulation value I3 input to the drive control circuit is kept unchanged, and the output power P in the standby mode is unchanged. In order to prevent the influence of the regulation process on the output of the switching power supply, when the power circuit 1 enters the standby state, the compensation current value I2 is linearly increased until the target compensation current value I21 is reached. When the power circuit 1 is in a standby mode, the current of the optical coupler is reduced under the condition that the output power P of the switching power supply is unchanged, and then the standby loss of the power control circuit 3 and the optical coupler feedback circuit 2 in an idle state is reduced. When the compensation current value I2 is increased to the target compensation current value I21, the compensation current value I2 is kept unchanged, the detection current value I1 is reduced along with the increase of the output power of the switching power supply, and the optocoupler current regulation value I3 is changed along with the change of the detection current value I1. In this embodiment, after the power circuit 1 is in the standby mode and when the optocoupler current regulation value I3 is less than or equal to the second preset current threshold value I32, it indicates that the power circuit 1 exits the standby mode, the standby state detection unit 32 outputs a signal for exiting the standby mode to the optocoupler current regulation unit 33, the compensation current value I2 of the optocoupler current regulation unit 33 is gradually reduced from the target compensation current value I21 until the compensation current value I21 is reduced to 0, and at this time, the optocoupler current regulation unit 33 stops regulating the optocoupler current. When the compensation current value I2 is 0, the optocoupler current regulation value I3 output by the adding unit 34 is equal to the detection current value I1, and when the output power P of the switching power supply is kept unchanged, both the output value of the adding unit 34 and the detection current value I1 are kept unchanged. When the output power P of the switching power supply decreases, the output value of the adding unit 34 and the detection current value I1 both increase along with the decrease of the output power P, and when the optocoupler current regulation value I3 is greater than the first preset current threshold value I31 again, the optocoupler current regulation unit 33 performs current compensation again to reduce the detection current value I1, thereby reducing the optocoupler current.
When the load of switching power supply's output alleviateed, the opto-coupler current of opto-coupler U1 rose along with output power P descends, leads to power control circuit 3's consumption, opto-coupler feedback circuit 2's consumption increase, compensates opto-coupler current through regulation and control module 30, makes opto-coupler current relatively less under standby mode, and then reduces standby power consumption. In the process of adjusting the optocoupler current by the adjustment and control module 30, the optocoupler current adjustment unit 33 adjusts the compensation current value I2 in a signal processing manner, for example, by processing a voltage signal, so that no extra power loss is generated when the adjustment and control circuit adjusts the optocoupler current.
In the present embodiment, the electrical signal Vfb in fig. 2 is a voltage signal for characterizing the detected current value I1, and the compensation current value I2 is also characterized by a voltage signal in the present embodiment, so that no additional standby loss is generated. In the present embodiment, it is preferred that,
fig. 4 is an embodiment of the adjusting process of the conditioning module 30 of the present application for the optical coupling current, specifically:
in the time period of 0-t1, the output power P of the switching power supply is unchanged and larger, the switching power supply is in a normal working state, the load is larger, at this time, the optocoupler current adjusting unit 33 does not compensate the optocoupler current, the compensation current value I2 is 0, the detection current value I1 output by the optocoupler current sampling unit 33 rises along with the reduction of the output power P of the power circuit 1, the detection current value I1 output by the optocoupler current sampling unit 33 decreases along with the increase of the output power P of the power circuit 1, the detection current value I1 is equal to the optocoupler current regulation value I3, and in this state, the optocoupler current does not need to be adjusted.
In a time period from t1 to t2, as the load of the load circuit is reduced, the output power P of the switching power supply is reduced, the optocoupler current rises along with the reduction of the output power P, the optocoupler current sampling unit 31 samples the optocoupler current in real time and outputs a detection current value I1 which is also increased, the optocoupler current adjusting unit 33 does not adjust the optocoupler current, the compensation current value I2 is 0, and at the moment, the detection current value I1 is equal to the optocoupler current adjusting value I3 and is increased synchronously; at the time t2, the output power P is smaller than the standby mode power value Plpm _ in, the optocoupler current regulation value I3 is larger than the first preset current threshold value I31, and the power circuit 1 enters the standby mode.
In a time period from t2 to t3, after the power circuit 1 enters the standby mode, the optocoupler current adjusting unit 33 starts to adjust the optocoupler current, the compensation current value I2 is gradually increased, and the output power P of the switching power supply is equal to the power value Plpm _ in entering the standby mode and remains unchanged, so that the electrical signal value at the input end of the driving control module 40 also remains unchanged, when the compensation current value I2 is gradually increased, which is linearly increased in the present embodiment, in order to keep the optocoupler current regulation value I3 unchanged when being input to the driving control module 40, the optocoupler current will automatically gradually decrease, and therefore, the detection current value I1 output by the optocoupler current sampling unit 31 also gradually decreases, and the sum of the detection current value I1 and the compensation current value I2 is equal to the optocoupler current regulation value I3 output by the adding unit 4. Until time t3, the compensation current value I2 reaches the target compensation current value, which is the maximum compensation value, after which the compensation current value I2 remains unchanged.
In the time period t3-t4, the output power P of the switching power supply rises due to the increase of the load, but the output power does not reach the exit standby mode, and the power circuit 1 continues to be in the standby mode. At this moment, the compensation current value I2 output by the optocoupler current adjustment unit keeps unchanged after reaching the target compensation current value, and as the output power P rises, the optocoupler current decreases, therefore, the detection current value I1 output by the optocoupler current sampling unit 31 also decreases, the optocoupler current adjustment value I3 input to the drive control module 40 also decreases accordingly, at the time of t4, the output power P is greater than or equal to the exit standby mode power value Plpm _ out, the optocoupler current reaches the minimum value, and the power consumption of the power control chip of the switching power supply also reaches the minimum value.
In a time period from t4 to t5, at a time point t4, the optocoupler current regulation value I3 is less than or equal to a second preset current threshold value I32, the power circuit 1 exits the standby mode, in an example, the output power P of the switching power supply is equal to the standby mode exit power value Plpm _ out and remains unchanged, the compensation current value I2 is gradually reduced until the value is reduced to 0, in order to keep the optocoupler current regulation value I3 input to the drive control module 40 unchanged, the optocoupler current is gradually increased, therefore, the detection current value I1 is also gradually increased, and when the compensation current value I2 is 0, the switching power supply is in a normal stable working state. Preferably, in other embodiments of the present application, a person skilled in the art may set the specific value of the second preset current threshold I32 according to the output power of the switching power supply.
In a time period from t5 to t6, the switching power supply is in a normal working mode, the optocoupler current adjusting unit 33 does not need to adjust the optocoupler current, the compensation current value I2 is 0, and the optocoupler current regulation value I3 at the output end of the adding unit 34 is equal to the detection current value I1. When the output power P of the switching power supply keeps unchanged, the optocoupler current also keeps unchanged, and therefore, the optocoupler current regulation value I3 and the detection current value I1 also keep unchanged.
In a time period from t6 to t7, the output power P of the switching power supply is reduced, the load of the switching power supply is reduced, the optocoupler current rises along with the reduction of the output power P, the detection current value I1 also rises along with the reduction of the output power P, the optocoupler current regulation value I3 increases along with the increase of the detection current value I1, the detection current value I1 gradually increases to a first preset current threshold value I31, wherein the detection current value I1 reaches the first preset current threshold value I31 at the time of t7, the power circuit 1 is judged to enter the standby mode again, and the output power P is equal to the power value Plpm _ in for entering the standby mode. Before entering the standby mode, the compensation current value I2 is 0, and the optocoupler current regulation value I3 at the output end of the adding unit 34 is equal to the detection current value I1.
And in a time period from t7 to t8, the switching power supply is in a standby mode, the output power P of the switching power supply is equal to the standby mode entering power value Plpm _ in and is kept unchanged, and the compensation current value I2 output by the optocoupler current adjusting unit 33 is gradually increased to the target compensation current value I21. When the compensation current value I2 is gradually increased, in order to keep the optocoupler current regulation value I3 unchanged when being input to the driving control module 40, the optocoupler current is gradually decreased along with the increase of the compensation current value I2, so the detection current value I1 output by the optocoupler current sampling unit 31 is also gradually decreased, and the sum of the detection current value I1 and the compensation current value I2 is equal to the optocoupler current regulation value I3 output by the adding unit 4. When the compensation current value I2 is equal to the target compensation current value I21, both the compensation current value I2 and the detection current value I1 remain unchanged.
In a time period from t8 to t9, the output power P of the switching power supply rapidly increases, but the output power P is smaller than the power value Plpm _ out exiting the standby mode, and at this time period, the switching power supply is still in the standby mode, the compensation current value I2 is equal to the target compensation current value I21, and the detection current value I1 decreases as the output power P increases, so the optocoupler current regulation value I3 output by the input adding unit 34 also decreases, and the optocoupler current regulation value I3 is equal to the detection current value I1 plus the target compensation current value I21. After time t9, the output power P is greater than or equal to the power Plpm _ out for exiting the standby mode, the power circuit 1 exits the standby mode, the switching power supply recovers to a normal operating state, because the output power P is still rising, the compensation current value I2 output by the optocoupler current adjustment unit 33 is rapidly reduced to 0, the detection current value I1 is also rapidly reduced synchronously, before the compensation current value I2 is reduced to 0, the optocoupler current regulation value I3 is equal to the detection current value I1 plus the target compensation current value I21, and the reduction speed of the optocoupler current regulation value I3 is greater than the reduction speed of any one of the detection current value I1 and the compensation current value I2. When the output power P is stabilized, the optocoupler current regulation value I3 is equal to the detection current value I1, both of which are kept unchanged, and at this time, the detection current value I1 changes with the change of the output power P.
After the time t9, the switching power supply recovers to a normal state, in order to ensure that the switching power supply can respond quickly and ensure dynamic performance, the compensation current value I2 output by the optocoupler current adjusting circuit 33 can adjust the reduction speed of the compensation current value I2 according to the size of the optocoupler current I, and the smaller the optocoupler current I is, the faster the compensation current value I2 drops until the compensation current value I2 is 0.
In this embodiment, the power control circuit 3 is implemented on a chip, and the power control circuit 3 is a power control chip.
Another embodiment of the present invention provides an electrical apparatus, which includes the aforementioned switching power supply, and further includes a load circuit, where the load circuit is electrically connected to the input terminal Vin and the output terminal Vout, respectively.
It should be understood that reference to "a plurality" herein means two or more. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for relevant points.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.
Claims (10)
1. The power control circuit for improving the standby power consumption is characterized by comprising a regulation module and a drive control module, wherein the drive control module is electrically connected with the regulation module and is used for being electrically connected with a power switch tube so as to control the power of the power circuit;
wherein the regulating and controlling module comprises an optical coupler current sampling unit, a standby state detecting unit, an optical coupler current regulating unit and an adding unit, the optical coupler current sampling unit is used for being electrically connected with an optical coupler of an optical coupler feedback circuit, the standby state detection unit is electrically connected with the optical coupler current regulation unit, the optical coupler current adjusting unit and the optical coupler current sampling unit are respectively electrically connected with the adding unit, the compensation current value output by the optical coupler current regulating unit and the detection current value obtained by sampling of the optical coupler current sampling unit are regulated and controlled by an adding unit, the output end of the addition unit is respectively and electrically connected with the standby state detection unit and the drive control module, the optocoupler current regulation value obtained by regulation and control of the addition unit is output to the standby state detection unit and the drive control module;
the standby state detection unit judges whether the power circuit is in a standby mode or not according to the optocoupler current regulation and control value, if the power circuit is in the standby mode, the optocoupler current regulation unit outputs a compensation current value to the addition unit to reduce the detection current value, the optocoupler current regulation and control value output by the addition unit is equal to the sum of the detection current value and the compensation current value, and the compensation current value is greater than 0 in the standby mode.
2. The power control circuit for improving standby power consumption according to claim 1, wherein the compensation current value is gradually increased to a target compensation current value after the power circuit enters the standby mode, the compensation current value remains unchanged after the compensation current value reaches the target compensation current value, the optocoupler current regulation value changes along with the detection current value, and the compensation current value is gradually decreased to 0 after the power circuit exits the standby mode.
3. The power control circuit for improving standby power consumption according to claim 2, wherein the compensation current value is linearly increased or linearly decreased.
4. The power control circuit for improving standby power consumption according to claim 1, wherein said detection current value and said compensation current value are characterized by a voltage signal.
5. The power control circuit for improving standby power consumption according to any one of claims 1 to 4, wherein the power control circuit is a power control chip.
6. The power control circuit for improving standby power consumption according to any one of claims 1 to 4, wherein before the power circuit enters the standby mode, the compensation current value is 0, the detection current value output by the optocoupler current sampling unit increases as the output power of the power circuit decreases, and the detection current value output by the optocoupler current sampling unit decreases as the output power of the power circuit increases.
7. The power control circuit for improving standby power consumption according to any one of claims 1 to 4, wherein the standby state detection unit has a first preset current threshold and a second preset current threshold, and if the optocoupler current regulation value is greater than or equal to the first preset current threshold, the standby state detection unit determines that the power circuit enters the standby mode, and if the optocoupler current regulation value is less than or equal to the second preset current threshold, the standby state detection unit determines that the power circuit exits the standby mode, wherein the first preset current threshold is greater than the second preset current threshold.
8. The power control circuit for improving standby power consumption according to any one of claims 1 to 4, wherein in the standby mode of the power circuit, the compensation current value is gradually increased to a target compensation current value, the detection current value is correspondingly decreased, and the optocoupler current regulation value is equal to the superposition of the detection current value and the compensation current value; alternatively, the first and second electrodes may be,
in a standby mode, the compensation current value is equal to the target compensation current value, the detection current value is reduced along with the increase of the output power of the power circuit, and the optocoupler current regulation value is reduced accordingly.
9. A switching power supply, comprising the power control circuit for improving standby power consumption according to any one of claims 1 to 8, and further comprising a power switch tube, wherein the driving control module is electrically connected to the power switch tube, and the power switch tube is configured to be electrically connected to the power circuit.
10. An electrical equipment, characterized in that, includes the switching power supply of claim 9, still includes power circuit and opto-coupler feedback circuit, power circuit with switching power supply's power switch tube electricity is connected, power circuit still with opto-coupler feedback circuit electricity is connected, opto-coupler feedback circuit includes the opto-coupler, the output of opto-coupler with opto-coupler current sampling unit electricity is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210381008.1A CN114884322A (en) | 2022-04-12 | 2022-04-12 | Power control circuit, switching power supply and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210381008.1A CN114884322A (en) | 2022-04-12 | 2022-04-12 | Power control circuit, switching power supply and electrical equipment |
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| Publication Number | Publication Date |
|---|---|
| CN114884322A true CN114884322A (en) | 2022-08-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210381008.1A Pending CN114884322A (en) | 2022-04-12 | 2022-04-12 | Power control circuit, switching power supply and electrical equipment |
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| Country | Link |
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| CN (1) | CN114884322A (en) |
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2022
- 2022-04-12 CN CN202210381008.1A patent/CN114884322A/en active Pending
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