CN115940587B - Power supply, output load adjustment rate compensation circuit and voltage adjustment method thereof - Google Patents
Power supply, output load adjustment rate compensation circuit and voltage adjustment method thereof Download PDFInfo
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Abstract
The invention discloses a power supply, an output load adjustment rate compensation circuit and a voltage adjustment method thereof, and relates to the technical field of power supplies. The circuit comprises: the state monitoring module is used for detecting the power supply state, generating a corresponding control signal according to the power supply state, and switching the power supply working mode according to the control signal; the current control module is used for generating a corresponding sampling signal according to the working mode and the control signal; sampling and amplifying the power supply output current according to the sampling signal; performing compensation processing on the sampling signal to generate a compensation signal; the voltage feedback module is used for monitoring the output voltage of the reverse input end of the voltage error amplifier in real time; the voltage regulation module is used for regulating the output voltage of the power supply by regulating the reference voltage. The invention distinguishes the no-load, light load and heavy load through detecting the power state, samples the output current of the power supply in the load state, adjusts the output voltage, and realizes the compensation of the power supply output load adjustment rate.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a power supply, an output load adjustment rate compensation circuit and a voltage adjustment method thereof.
Background
With the rapid development of electronic technology, the performance requirements of various electronic and electrical equipment on voltage stabilization are correspondingly improved, and especially, a direct-current voltage-stabilized power supply is integrated in some chips, so that stable voltage support is improved in the chips.
The communication power supply generally forms a system with various capacities to supply power to loads, different loads have different requirements on the load adjustment rate of the power supply, the requirements on the load adjustment rate of the industry standard of the communication high-frequency switch rectifier are not more than 0.5%, but the requirements on the adjustment rate of the power supply of some devices are higher.
A load refers to an electronic component connected across a power supply in a circuit, a device for converting electrical energy into other forms of energy. Common loads are power consuming components such as resistors, engines and bulbs.
The load regulation rate is an important index of the regulated power supply, and represents the corresponding change condition of the output voltage of the regulated power supply when the load current changes, and is generally represented by the change amount of the output voltage and the percentage value of the output voltage when the output current changes from 0 to the rated maximum current. Its variation causes a change in the power supply output, an increase in load, a decrease in output, and conversely a decrease in load and an increase in output. The output change caused by good power load change is small, and the index is usually 3% -5%. The load adjustment rate is an index for measuring the power supply. The voltage drop is small when the good power supply output is connected with the load.
The line resistance and the plug-in resistance in the circuit can have a great influence on the power load adjustment rate, and most of power supplies in the prior art do not have effective improvements on the influence caused by the resistance. And most of the improvements on the power supply load adjustment rate do not distinguish between the states in which the power supply is in, such as distinguishing between the power supply idle and load states; meanwhile, the power output load adjustment rate in the light load and heavy load states is not compensated.
Disclosure of Invention
The invention aims to provide an output load adjustment rate compensation circuit of a power supply, which is used for distinguishing a no-load from a load through detection of a power supply state, distinguishing a light load from a heavy load in the load state, sampling the output current of the power supply in the load state and realizing compensation of the output load adjustment rate of the power supply through calculation of a compensation voltage.
The aim of the invention can be achieved by the following technical scheme:
in a first aspect, an embodiment of the present application provides an output load adjustment rate compensation circuit of a power supply, including a state monitoring module, a current control module, a voltage feedback module, and a voltage adjustment module that are sequentially connected;
the state monitoring module comprises a detection unit and a switching unit, wherein when the detection unit detects that the power supply is in an idle state, an idle control signal is generated and is switched to an idle working mode; when the detection unit detects that the power supply is in a loading state, a loading control signal is generated and is switched to a loading working mode;
the current control module comprises a sampling unit and a signal unit;
the sampling unit is connected with the signal unit and is used for sampling the output current of the power supply according to the load control signal, generating a sampling signal and outputting the sampling signal to the signal unit;
the signal unit is used for carrying out compensation processing on the sampling signal, generating a compensation signal and sending the compensation signal to the voltage feedback module;
the voltage feedback module is connected with the reverse input end of the voltage error amplifier and is used for monitoring the output voltage of the reverse input end of the voltage error amplifier in real time;
the voltage regulating module is connected with the same-direction input end of the voltage error amplifier and is used for regulating the output voltage of the power supply by regulating the reference voltage of the same-direction input end of the voltage error amplifier.
As a preferable technical scheme of the invention, the detection unit comprises a main control circuit and an idle circuit;
the main control circuit is used for providing an electric signal and controlling the operation of a load;
the no-load circuit is electrically coupled to the load and is used for detecting whether the power supply is in an no-load state or not and generating no-load control signals;
the main control circuit receives the no-load control signal and controls the power supply to be switched into a no-load working mode.
As a preferable technical scheme of the invention, the switching unit comprises a load circuit and a load assembly;
the load circuit is connected with the no-load circuit and is used for detecting whether the power supply is in a load state or not and generating a load control signal; the main control circuit receives the load control signal, controls the power supply to switch to a load working mode, provides current for the load and controls the load to operate;
the on-load working mode comprises a heavy load mode and a light load mode; the load control signal comprises a heavy load signal and a light load signal;
the load assembly is used for judging the connection state of the load; the connection state of the load includes: normal connected and unconnected; and the load circuit switches the working state according to the connection state of the load.
As a preferred technical scheme of the present invention, the switching unit further includes a switching circuit, where the switching circuit is connected with the load circuit, and is configured to switch the load working mode to the heavy load mode according to the heavy load signal, and switch the load working mode to the light load mode according to the light load signal;
wherein, in the light load mode, the power supply is in an intermittent state; in the heavy-load mode, the power supply is in a forced conduction state; and when the light load mode jumps to the heavy load mode or the heavy load mode jumps to the light load mode, the power supply is in a continuous state.
As a preferable technical scheme of the invention, the sampling unit comprises a current divider, a plurality of voltage collectors and a plurality of current collectors, wherein the current collectors are connected in series, and the voltage collectors are connected in parallel with the current collectors; the signal unit attenuates the sampled signal in proportion to form the compensation signal.
As a preferable technical scheme of the invention, the current control module further comprises an amplifying unit, and the amplifying unit is connected with the sampling unit and is used for amplifying the output current of the power supply.
As a preferred technical solution of the present invention, the circuit further comprises a filter capacitor, a filter inductor and a rectifier diode;
one end of the filter capacitor is grounded, and the other end of the filter capacitor is connected to the output voltage;
the filter inductor is connected to the output voltage and is used for filtering the output voltage;
the rectifying diode is connected with the filtering inductor and used for rectifying the input voltage before filtering.
In a second aspect, an embodiment of the present application provides a voltage adjustment method of an output load adjustment rate compensation circuit of a power supply as described above, including the steps of:
detecting a power state, and generating a corresponding control signal according to the power state;
switching a power supply working mode according to the control signal;
generating a corresponding sampling signal according to the working mode and the control signal;
sampling and amplifying the power supply output current according to the sampling signal;
performing compensation processing on the sampling signal to generate a compensation signal;
monitoring the output voltage of the power supply in real time according to the compensation signal;
and adjusting the output voltage of the power supply according to the compensation signal.
In a third aspect, embodiments of the present application provide a power supply with a load compensation function, including a power supply circuit, and further including an output load adjustment rate compensation circuit of the power supply as described above, where the power supply circuit is connected to the output load adjustment rate compensation circuit of the power supply.
The beneficial effects of the invention are as follows:
and detecting the power supply state, distinguishing the empty load state from the load state, and switching the power supply working mode according to different states.
And distinguishing the load state from the light load state and the heavy load state.
Sampling is carried out on the output current in the power supply load state, and the compensation of the power supply output load adjustment rate is realized by adjusting the reference voltage.
Drawings
For a better understanding and implementation, the technical solutions of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a block diagram of an output load adjustment rate compensation circuit of a power supply according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a detection unit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a switching unit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a power output load adjustment rate compensation circuit according to an embodiment of the present disclosure;
fig. 5 is a flowchart of a voltage adjustment method of a power output load adjustment rate compensation circuit according to an embodiment of the present application.
Detailed Description
For further explanation of the technical means and effects adopted by the present invention for achieving the intended purpose, exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of methods and systems that are consistent with aspects of the present application, as detailed in the accompanying claims.
The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
The following detailed description of specific embodiments, features and effects according to the present invention is provided with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1, the invention provides an output load adjustment rate compensation circuit of a power supply, which comprises a state monitoring module 1, a current control module 2, a voltage feedback module 3 and a voltage adjusting module 4 which are connected in sequence;
the state monitoring module 1 comprises a detection unit 10 and a switching unit 11, wherein when the detection unit 10 detects that the power supply is in an idle state, an idle control signal is generated and is switched to an idle working mode; when the detection unit 10 detects that the power supply is in a loading state, a loading control signal is generated and is switched to a loading working mode;
the current control module 2 comprises a sampling unit 20 and a signal unit 21;
the sampling unit 20 is connected with the signal unit 21, and is configured to sample an output current of the power supply according to the load control signal, generate a sampling signal, and output the sampling signal to the signal unit 21;
the signal unit 21 is configured to perform compensation processing on the sampling signal 20, generate a compensation signal, and send the compensation signal to the voltage feedback module 3;
the voltage feedback module 3 is connected with the reverse input end of the voltage error amplifier and is used for monitoring the output voltage of the reverse input end of the voltage error amplifier in real time;
the voltage regulating module 4 is connected with the same-direction input end of the voltage error amplifier and is used for regulating the output voltage of the power supply by regulating the reference voltage of the same-direction input end of the voltage error amplifier.
Specifically, the power supply circuit is monitored to determine what state the power supply is in. If the load in the circuit does not run, the power supply is in an idle state, the current in the circuit is stable, and the output voltage is not changed greatly; if the load in the circuit is running, the power supply is in a loaded state, and when the power supply is in the loaded state, the current in the circuit changes, so that the output voltage changes, and the power supply load adjustment rate further changes. Further, the output current of the circuit in the loaded state is sampled, a sampling signal is generated and sent to the signal unit, the signal unit compensates the sampling signal to generate a compensation signal, a compensation voltage is generated according to the compensation signal, the compensation voltage is amplified by the voltage error amplifier, and the voltage output voltage is finally regulated by the voltage regulating module. The regulated output voltage does not generate great fluctuation change, so that the change of the power supply load adjustment rate is not caused.
Referring to fig. 2, in one embodiment of the present invention, the detecting unit 10 includes a main control circuit 101 and an idle circuit 102;
the main control circuit 101 is used for providing an electric signal and controlling the operation of a load;
the idle circuit 102 is electrically coupled to the load, and is configured to detect whether the power supply is in an idle state, and generate an idle control signal;
the main control circuit 101 receives an idle load control signal, and controls the power supply to switch to an idle load operation mode.
Specifically, the detection unit detects the power supply circuit in real time, and when the power supply is detected to be in an idle state, the circuit is switched into an idle circuit, and an idle control signal is generated and sent to the switching unit; the main control circuit switches the working mode to an idle load control mode according to the idle load control signal; the no-load circuit is electrically coupled with the load, and when the power supply is in no-load state, the main control circuit can not send out an electric signal, so that the load is not in an operating state.
Referring to fig. 3, in one embodiment of the present invention, the switching unit 11 includes a load circuit 110 and a load component 111;
the load circuit 110 is connected to the idle circuit 102, and is configured to detect whether the power supply is in a load state, and generate a load control signal; the main control circuit 101 receives the load control signal, controls the power supply to switch to the load working mode, provides current for the load and controls the load to operate;
the load working mode comprises a heavy load mode and a light load mode; the load control signal comprises a heavy load signal and a light load signal;
the load assembly 111 is used for judging the connection state of the load; the connection state of the load includes: normal connected and unconnected; the load circuit 110 switches the working state according to the connection state of the load.
Specifically, the switching unit is mainly used for switching the control circuit according to the power state. The switching unit receives the no-load control signal sent by the detection unit, and then switches the power supply circuit to the no-load circuit according to the no-load control signal; the switching unit comprises a load circuit which is connected with the detection unit, in particular to the no-load circuit. When the detection unit detects that the power supply is in a load state, the main control circuit can send out an electric signal to control the load to operate, and meanwhile, the circuit is switched to the load circuit to generate a load control signal and send the load control signal to the main control circuit; the main control circuit receives the load control signal and controls the power supply to switch to the load working mode, and the load normally operates in the load working mode.
Further, the on-load working mode is divided into a heavy-load mode and a light-load mode, and the on-load control signal is also divided into a heavy-load signal and a light-load signal; the heavy load signal corresponds to the heavy load mode, and the light load signal corresponds to the light load signal. It should be noted that, the heavy load mode and the light load mode may be switched.
Further, the switching unit further comprises a load assembly, and the load assembly judges the connection state of the load, so that the corresponding working state is switched according to the corresponding load state; the load assembly switches between two operating states based on the connection state of the load. When the connection state of the load is normal connection, the load circuit is switched to a second working state; and when the connection state of the load is unconnected, switching the load circuit to the first working state. In a first working state, the load circuit outputs signals of preset frequency and preset duty ratio; in the second operating state, the on-load circuit continuously outputs a high level.
In one embodiment of the present invention, the switching unit 11 further includes a switching circuit 112, where the switching circuit 112 is connected to the load circuit 110, and is configured to switch the load operation mode to the heavy load mode according to the heavy load signal, and switch the load operation mode to the light load mode according to the light load signal;
in the light load mode, the power supply is in an intermittent state; in the heavy-load mode, the power supply is in a forced conduction state; and when the light load mode jumps to the heavy load mode or the heavy load mode jumps to the light load mode, the power supply is in a continuous state.
Specifically, the switching unit realizes switching between a heavy load mode and a light load mode through the switching circuit. And when the heavy load signal is received, the on-load working mode is switched to the heavy load mode, and when the light load signal is received, the on-load working mode is switched to the light load mode.
Further, when the load is in a heavy-load mode, the power supply is in a forced conduction state, and the power supply forcefully conducts the circuit and outputs strong voltage; when the load is in a light load mode, the power supply is in an intermittent state, and the output voltage is not stable enough; when the load jumps from the heavy load mode to the light load mode, the output voltage and current of the power supply are reduced and become unstable, and the power supply enters a continuous state from a forced conduction state and enters an intermittent state after a preset time; when the load jumps from the light load mode to the heavy load mode, the power supply enters a continuous state from an intermittent state, continuously and stably outputs voltage and current, and enters a forced conduction state after a preset time.
In one embodiment provided by the present invention, the sampling unit 20 includes a current divider, a plurality of voltage collectors and a plurality of current collectors, wherein the plurality of current collectors are connected in series, and the voltage collectors are connected in parallel with the current collectors; the signal unit 20 attenuates the sampled signal in proportion to form the compensation signal.
In one embodiment of the present invention, the current control module 2 further includes an amplifying unit 21, where the amplifying unit 21 is connected to the sampling unit 20, and is configured to amplify the output current of the power supply.
Specifically, the current collectors are connected in series in the power supply circuit and are used for collecting currents in the circuit, the current collectors comprise a plurality of current collectors, each current collector contains internal resistance, and therefore the current collectors can also provide a certain resistance for the power supply circuit; the voltage collector is connected with the current collector in parallel and is used for collecting voltages at two ends of the current collector. When the power supply is in a light load mode, the power supply is in an intermittent state, and the current in the circuit is small, so that the current is required to be collected by the current collector, and then the voltage is required to be collected by the voltage collector. Because the current collectors and the voltage collectors are multiple in the embodiment of the application, the output current of the power supply circuit can be obtained by dividing the voltage collected by the multiple voltage collectors by the internal resistances of the multiple current collectors.
Further, the current control module samples the output current of the circuit by using the sampling unit, generates a sampling signal and amplifies the output current by using the amplifying unit; the signal unit performs compensation processing on the output current according to the sampling signal to generate a compensation signal. The compensation process specifically comprises the following steps: the signal unit receives the amplified output current, and because the power supply circuit has the internal resistance of the circuit and other resistors besides the internal resistance of the current collector, all the resistors in the circuit are integrated into a total resistor, and the output current and the total resistor are used for carrying out arithmetic operation to obtain the compensation voltage.
In one embodiment of the present invention, the circuit further includes a signal filtering module 5, where the signal filtering module 5 is connected to the current control module 2, and is configured to filter the compensation signal and output the filtered compensation signal to the voltage feedback module 3.
In particular, the compensation signal is filtered by means of the signal filtering module 5 for filtering noise in the compensation signal, since the signal-to-noise ratio is different in the case of different output currents. In the no-load and light-load conditions, the noise signal is relatively large, and the specific conditions need to be judged according to the structure of the transformer, the size of the coupling capacitor determined by the winding mode, the electric pin of the switching working frequency and the size of the output inductor. The signal filtering module plays a great role in normal and stable operation of the power supply.
In one embodiment provided by the invention, the circuit further comprises a filter capacitor, a filter inductor and a rectifier diode;
one end of the filter capacitor is grounded, and the other end of the filter capacitor is connected to the output voltage;
the filter inductor is connected to the output voltage and used for filtering the output voltage;
the rectifier diode is connected with the filter inductor and used for rectifying the input voltage before filtering.
Referring to fig. 4, specifically, a circuit of the current control module 2 is composed of a shunt R6, a current collector R7 and a voltage collector R8; the signal filtering module 5 is composed of a resistor R5 and a capacitor C2; the voltage feedback module 3 is composed of a resistor R3 and a resistor R5; the voltage regulating module 4 consists of an adjustable potentiometer RP1, a resistor R4 and a resistor R5; the total resistance on the output circuit is equivalent by the resistor R1 and the resistor R2.
In the circuit provided in this embodiment, the cathode of the rectifying diode VD1 is connected to one end of the filter inductor L1, and the other end of the filter inductor L1, one end of the capacitor C1, one end of the resistor R1 and one end of the resistor R3 are connected to v+; the other end of the capacitor C1 is connected with the power supply ground GDN; the other end of the resistor R1 is connected with one end of the capacitor C3 to be V+; the other end of the resistor R3 is connected with one end of the adjustable potentiometer RP 1; the other end of the adjustable potentiometer RP1 and one end of the resistor R5 are connected with one end of the capacitor C2; the other end of the capacitor C2 and the other end of the capacitor C1 are connected to the power ground GND; the other end of the resistor R5 is connected with one end of the voltage collector R8; the other end of the voltage collector R8 is connected with one end of the current collector R7; the other end of the current collector R7 is connected with one end of the current divider R6; the other end of the shunt R6 is connected with one end of the resistor R2; the other end of the resistor R2 is connected to the other end of the capacitor C2 at V-.
According to the invention, no-load and load are distinguished through detection of the power state, and the power working mode is switched according to different states; the method is characterized by distinguishing light load and heavy load in a load state, sampling output current of a power supply in the load state, and realizing compensation of the output load adjustment rate of the power supply by adjusting reference voltage.
Referring to fig. 5, an embodiment of the present invention provides a voltage adjustment method of an output load adjustment rate compensation circuit of a power supply, including the following steps:
s101, detecting a power state, and generating a corresponding control signal according to the power state;
s102, switching a power supply working mode according to a control signal;
s103, generating a corresponding sampling signal according to the working mode and the control signal;
s104, sampling and amplifying the power supply output current according to the sampling signal;
s105, performing compensation processing on the sampling signal to generate a compensation signal;
s106, monitoring the output voltage of the power supply in real time according to the compensation signal;
and S107, adjusting the output voltage of the power supply according to the compensation signal.
Specifically, the power supply circuit is monitored, which state the power supply is in is judged, and a corresponding control signal is generated according to the power supply state. If the load in the circuit does not run, the power supply is in an idle state, an idle control signal is generated, the current in the circuit is stable, and the output voltage does not change greatly; if the load in the circuit is running, the power supply is in a load state, a load control signal is generated, and when the power supply is in the load state, the current in the circuit is changed, so that the output voltage is changed, and the power supply load adjustment rate is further changed. Then, the output current of the circuit in the loaded state is sampled, a sampling signal is generated, and the output current is amplified. Further, the amplified output current is subjected to compensation processing, thereby generating a compensation signal, and a compensation voltage is generated according to the compensation signal; finally, after the voltage error amplifier is used for amplifying, the output voltage of the voltage is finally regulated, so that the output voltage of the power supply is stable. The regulated output voltage does not generate great fluctuation change, so that the change of the power supply load adjustment rate is not caused.
The embodiment of the invention also provides a power supply with a load compensation function, which comprises a power supply circuit and the output load adjustment rate compensation circuit of the power supply, wherein the power supply circuit is connected with the output load adjustment rate compensation circuit of the power supply.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (6)
1. An output load adjustment rate compensation circuit of a power supply is characterized in that: the system comprises a state monitoring module, a current control module, a voltage feedback module and a voltage regulation module which are connected in sequence;
the state monitoring module comprises a detection unit and a switching unit, wherein when the detection unit detects that the power supply is in an idle state, an idle control signal is generated and is switched to an idle working mode; when the detection unit detects that the power supply is in a loading state, a loading control signal is generated and is switched to a loading working mode;
the current control module comprises a sampling unit and a signal unit;
the sampling unit is connected with the signal unit and is used for sampling the output current of the power supply according to the load control signal, generating a sampling signal and outputting the sampling signal to the signal unit;
the sampling unit comprises a current divider, a plurality of voltage collectors and a plurality of current collectors, wherein the current collectors are connected in series, and the voltage collectors are connected in parallel with the current collectors;
the signal unit is used for carrying out compensation processing on the sampling signal, generating a compensation signal and sending the compensation signal to the voltage feedback module; wherein the signal unit attenuates the sampled signal proportionally to form the compensation signal;
the voltage feedback module is connected with the reverse input end of the voltage error amplifier and is used for monitoring the output voltage of the reverse input end of the voltage error amplifier in real time;
the voltage regulating module is connected with the same-direction input end of the voltage error amplifier and is used for regulating the output voltage of the power supply by regulating the reference voltage of the same-direction input end of the voltage error amplifier;
the detection unit comprises a main control circuit and an idle circuit;
the main control circuit is used for providing an electric signal and controlling the operation of a load;
the no-load circuit is electrically coupled to the load and is used for detecting whether the power supply is in an no-load state or not and generating no-load control signals; the main control circuit receives the no-load control signal and controls the power supply to be switched into a no-load working mode;
the switching unit comprises a load circuit and a load assembly;
the load circuit is connected with the no-load circuit and is used for detecting whether the power supply is in a load state or not and generating a load control signal;
the main control circuit receives the load control signal, controls the power supply to switch to a load working mode, provides current for the load and controls the load to operate; the on-load working mode comprises a heavy load mode and a light load mode; the load control signal comprises a heavy load signal and a light load signal;
the load assembly is used for judging the connection state of the load; the connection state of the load includes: normal connected and unconnected; the load circuit switches working states according to the connection state of the load, wherein the working states comprise a first working state and a second working state;
when the connection state of the load is normal connection, the load circuit is switched to the second working state; when the connection state of the load is unconnected, the load circuit is switched to the first working state; in the first working state, the on-load circuit outputs signals with preset frequency and preset duty ratio; in the second working state, the load circuit continuously outputs high level;
the switching unit further comprises a switching circuit, wherein the switching circuit is connected with the on-load circuit and is used for switching the on-load working mode into the heavy-load mode according to the heavy-load signal and switching the on-load working mode into the light-load mode according to the light-load signal;
wherein, in the light load mode, the power supply is in an intermittent state; in the heavy-load mode, the power supply is in a forced conduction state; and when the light load mode jumps to the heavy load mode or the heavy load mode jumps to the light load mode, the power supply is in a continuous state.
2. The output load adjustment rate compensation circuit of a power supply of claim 1, wherein: the current control module further comprises an amplifying unit, wherein the amplifying unit is connected with the sampling unit and is used for amplifying the output current of the power supply.
3. The output load adjustment rate compensation circuit of a power supply of claim 1, wherein: the voltage feedback module is used for receiving the compensation signal and outputting the compensation signal to the voltage feedback module.
4. The output load adjustment rate compensation circuit of a power supply of claim 1, wherein: the filter capacitor, the filter inductor and the rectifier diode are also included;
one end of the filter capacitor is grounded, and the other end of the filter capacitor is connected to the output voltage;
the filter inductor is connected to the output voltage and used for filtering the output voltage;
the rectifying diode is connected with the filtering inductor and used for rectifying the input voltage before filtering.
5. A voltage adjustment method of an output load adjustment rate compensation circuit of a power supply according to claim 1, characterized by: the method comprises the following steps:
detecting a power state, and generating a corresponding control signal according to the power state;
switching a power supply working mode according to the control signal;
generating a corresponding sampling signal according to the working mode and the control signal;
sampling and amplifying the power supply output current according to the sampling signal;
performing compensation processing on the sampling signal to generate a compensation signal;
monitoring the output voltage of the power supply in real time according to the compensation signal;
and adjusting the output voltage of the power supply according to the compensation signal.
6. A power supply with load compensation function, comprising a power supply circuit, characterized in that: further comprising an output load adjustment rate compensation circuit of the power supply according to any of claims 1-4, the power supply circuit being connected to the output load adjustment rate compensation circuit of the power supply.
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| CN204578374U (en) * | 2015-04-20 | 2015-08-19 | 深圳市京泉华科技股份有限公司 | Power supply and output loading regulation compensating circuit thereof |
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| CN100573398C (en) * | 2007-01-29 | 2009-12-23 | 中兴通讯股份有限公司 | Be used to improve the device of power supply load regulation rate |
| CN102624254B (en) * | 2012-03-26 | 2014-06-18 | 矽力杰半导体技术(杭州)有限公司 | Constant voltage constant current control circuit with improved load regulation and control method thereof |
| CN105743369B (en) * | 2016-03-23 | 2018-04-03 | 苏州美思迪赛半导体技术有限公司 | A kind of line loss compensation system and method for primary side feedback Switching Power Supply |
| CN114200993B (en) * | 2021-12-06 | 2023-01-17 | 中国科学院微电子研究所 | Linear voltage regulator with fast transient response and low load regulation rate |
| CN114825969B (en) * | 2022-06-22 | 2022-10-18 | 深圳市力生美半导体股份有限公司 | Flyback switching power supply and output control system, method and chip thereof |
| CN114928244B (en) * | 2022-06-29 | 2023-03-10 | 深圳市微源半导体股份有限公司 | Line loss compensation correction method and circuit based on output current |
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| CN204578374U (en) * | 2015-04-20 | 2015-08-19 | 深圳市京泉华科技股份有限公司 | Power supply and output loading regulation compensating circuit thereof |
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