CN114374311B - Load power characterization method, system and processing module - Google Patents

Load power characterization method, system and processing module Download PDF

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Publication number
CN114374311B
CN114374311B CN202210274681.5A CN202210274681A CN114374311B CN 114374311 B CN114374311 B CN 114374311B CN 202210274681 A CN202210274681 A CN 202210274681A CN 114374311 B CN114374311 B CN 114374311B
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voltage
module
load
power supply
power
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CN114374311A (en
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邓超
宗强
方芳
刘准
汪虎
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Shenzhen Chip Hope Micro-Electronics Ltd
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Shenzhen Chip Hope Micro-Electronics 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • 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

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  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application discloses a method, a system and a processing module for representing the power of a load, which are applied to the processing module in a switch power supply system, wherein a voltage conversion module in the switch power supply system converts the output voltage of a power supply when the voltage conversion module is started; the first sampling module samples the output voltage of the power supply to obtain a first voltage; the error amplification module amplifies an error value of a second voltage obtained by sampling the voltage of the load by a second sampling module and a preset time to obtain a third voltage; the comparison module compares a preset sawtooth wave with a third voltage to obtain a PWM signal; the driving module outputs a driving signal according to the PWM signal to control the voltage conversion module to be switched on or switched off; the processing module represents the power of the load according to the product of the first voltage and the third voltage, the power of the load is in positive correlation with the square of the product, the power of the load can be represented without monitoring the change of the output current of the switching power supply system, and therefore the modulation mode can be optimized according to the power of the load.

Description

Load power characterization method, system and processing module
Technical Field
The present invention relates to the field of load power characterization, and in particular, to a method, a system, and a processing module for load power characterization.
Background
In the existing switching power supply system based on pulse width modulation, a power supply, a voltage conversion module and a load are connected in sequence, and in order to obtain stable output voltage of the switching power supply system based on pulse width modulation, when the power of the load changes, the duty ratio of a driving signal of the voltage conversion module is adjusted by sampling the change condition of the output voltage so as to achieve stable output voltage. In some designs, it is necessary to know the power of a load and change the logic of optimal modulation according to the power of the load to obtain lower loss or other application indexes, considering that the power of the load is the product of output voltage and output current, and the output voltage of the pulse width modulation-based switching power supply system is obtained, at this time, the output current of the pulse width modulation-based switching power supply system needs to be obtained again, but the system generally only monitors the change of the output voltage, but does not monitor and is not convenient to monitor the change of the output current, so that the power of the load cannot be directly monitored, and therefore, how to represent the power of the load is an urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a method, a system and a processing module for representing the power of a load, the scheme can represent the power of the load according to the product of a first voltage and a third voltage, the power of the load is in positive correlation with the square of the product of the first voltage and the third voltage, and the power of the load can be represented without monitoring the change of the output current of a switching power supply system, so that the modulation mode can be optimized according to the power of the load.
In order to solve the technical problem, the present application provides a method for characterizing power of a load, which is applied to a processing module in a switching power supply system, wherein the switching power supply system further includes a voltage conversion module, an error amplification module, a comparison module, a driving module, a first sampling module and a second sampling module, and a power supply, the voltage conversion module and the load are connected in sequence; the voltage conversion module is used for converting the output voltage of the power supply when the voltage conversion module is started; the first sampling module is used for sampling the output voltage of the power supply to obtain a first voltage; the second sampling module is used for sampling the voltage of the load to obtain a second voltage; the error amplification module is used for amplifying the error value of a preset reference voltage and the second voltage by a preset multiple to obtain a third voltage; the comparison module is used for comparing a preset sawtooth wave with the third voltage to obtain a PWM signal; the driving module is used for outputting a driving signal according to the PWM signal to control the voltage conversion module to be switched on or switched off;
the method for characterizing the power of the load comprises the following steps:
acquiring the first voltage and the third voltage;
characterizing a power of the load as a product of the first voltage and the third voltage, the power of the load being positively correlated with a square of the product of the first voltage and the third voltage.
Preferably, the switching power supply system further includes a multiplier, before characterizing the power of the load according to the product of the first voltage and the third voltage, further includes:
and acquiring the product of the first voltage and the third voltage through the multiplier.
Preferably, the first sampling module comprises a first resistor and a second resistor, one end of the first resistor is connected to the power supply and the voltage conversion module, the other end of the first resistor is connected to one end of the second resistor and the processing module, and the other end of the second resistor is grounded.
Preferably, the second sampling module includes a third resistor and a fourth resistor, one end of the third resistor is connected to the voltage conversion module and the load, the other end of the third resistor is connected to one end of the fourth resistor and the error amplification module, and the other end of the fourth resistor is grounded.
Preferably, the error amplification module is an error amplifier, and the error amplifier is configured to amplify an error value between the preset reference voltage input by the positive input terminal of the error amplifier and the second voltage input by the negative input terminal of the error amplifier by a preset multiple to obtain the third voltage.
Preferably, the comparison module is a comparator, the comparator is used for outputting a high level when the third voltage input by the positive input end of the comparator is greater than the preset sawtooth wave input by the negative input end of the comparator, and outputting a low level when the third voltage input by the positive input end of the comparator is less than the preset sawtooth wave input by the negative input end of the comparator, so as to obtain the PWM signal.
Preferably, after characterizing the power of the load according to the product of the first voltage and the third voltage, the method further includes:
and if the power of the load is judged to be smaller than the preset power, sending a control signal to the driving module to control the frequency of the driving signal output by the driving module to be reduced to the preset frequency.
Preferably, the voltage conversion module is a Buck converter, and when the switching power supply system operates in the discontinuous mode, characterizing the power of the load according to the product of the first voltage and the third voltage includes:
according to the formula
Figure 242025DEST_PATH_IMAGE001
Acquiring the time for controlling the conduction of a controllable switch in the Buck converter in one period of the driving signal
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The above-mentioned
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Is the third voltage, the
Figure 378587DEST_PATH_IMAGE004
Is that it is
Figure 268045DEST_PATH_IMAGE003
And the above
Figure 569976DEST_PATH_IMAGE002
The coefficient of the conversion relation of (c);
according to the formula
Figure 417846DEST_PATH_IMAGE005
Obtaining an input voltage of the switching power supply system
Figure 405394DEST_PATH_IMAGE006
The above-mentioned
Figure 692019DEST_PATH_IMAGE007
Is the first voltage, the
Figure 346991DEST_PATH_IMAGE008
Is that the
Figure 100183DEST_PATH_IMAGE006
And said
Figure 604720DEST_PATH_IMAGE007
The coefficient of the conversion relation of (c);
according to the formula
Figure 101561DEST_PATH_IMAGE009
Obtaining the peak current of the switching power supply system
Figure 876619DEST_PATH_IMAGE010
Said
Figure 535133DEST_PATH_IMAGE011
The inductance of the inductor in the Buck converter;
according to the formula
Figure 28431DEST_PATH_IMAGE012
Obtaining input power of the switching power supply system
Figure 922438DEST_PATH_IMAGE013
The above-mentioned
Figure 692948DEST_PATH_IMAGE014
Is the frequency of the drive signal;
according to the formula
Figure 148462DEST_PATH_IMAGE015
Characterizing output power of the switching power supply system
Figure 4423DEST_PATH_IMAGE016
Output power of the switching power supply system
Figure 967700DEST_PATH_IMAGE016
Is the power of the load, the
Figure 920612DEST_PATH_IMAGE017
For the transmission efficiency of the switching power supply system, the
Figure 186509DEST_PATH_IMAGE018
Is a fixed value corresponding to the switching power supply system.
In order to solve the technical problem, the application further provides a system for characterizing the power of the load, which is applied to a switch power supply system, wherein the switch power supply system comprises a voltage conversion module, an error amplification module, a comparison module, a driving module, a first sampling module and a second sampling module, and a power supply, the voltage conversion module and the load are sequentially connected; the voltage conversion module is used for converting the output voltage of the power supply when the voltage conversion module is started; the first sampling module is used for sampling the output voltage of the power supply to obtain a first voltage; the second sampling module is used for sampling the voltage of the load to obtain a second voltage; the error amplification module is used for amplifying the error value of a preset reference voltage and the second voltage by a preset multiple to obtain a third voltage; the comparison module is used for comparing a preset sawtooth wave with the third voltage to obtain a PWM signal; the driving module is used for controlling the voltage conversion module to be switched on or switched off according to the PWM signal;
a system for characterizing power of the load, comprising:
a voltage acquisition unit configured to acquire the first voltage and the third voltage;
a power obtaining unit for characterizing the power of the load according to the product of the first voltage and the third voltage, wherein the power of the load is positively correlated with the square of the product of the first voltage and the third voltage.
In order to solve the above technical problem, the present application further provides a processing module, including:
a memory for storing a computer program;
a processor for executing said computer program for implementing the steps of the method for characterizing the power of said load as described above.
The application provides a method, a system and a processing module for characterizing the power of a load, which are applied to the processing module in a switch power supply system, wherein a voltage conversion module in the switch power supply system converts the output voltage of a power supply when the voltage conversion module is started; the first sampling module samples the output voltage of the power supply to obtain a first voltage; the error amplification module amplifies an error value of a second voltage obtained by sampling the voltage of the load by a preset reference voltage and a second sampling module by a preset multiple to obtain a third voltage; the comparison module compares a preset sawtooth wave with a third voltage to obtain a PWM signal; the driving module outputs a driving signal according to the PWM signal to control the voltage conversion module to be switched on or switched off; the processing module represents the power of the load according to the product of the first voltage and the third voltage, the power of the load is in positive correlation with the square of the product of the first voltage and the third voltage, and the power of the load can be represented without monitoring the change of the output current of the switching power supply system, so that the modulation mode can be optimized according to the power of the load.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the prior art and the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a method for characterizing power of a load provided herein;
fig. 2 is a schematic structural diagram of a switching power supply system provided in the present application;
FIG. 3a is a schematic diagram of a comparator according to the present application;
FIG. 3b is a schematic diagram of another comparator provided in the present application;
FIG. 4 is a schematic diagram of a system for characterizing power of a load according to the present application;
fig. 5 is a schematic structural diagram of a processing module provided in the present application.
Detailed Description
The core of the application is to provide a method, a system and a processing module for representing the power of the load, the scheme can represent the power of the load according to the product of the first voltage and the third voltage, the power of the load is in positive correlation with the square of the product of the first voltage and the third voltage, and the power of the load can be represented without monitoring the change of the output current of the switching power supply system, so that the modulation mode can be optimized according to the power of the load.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Fig. 1 is a flowchart of a method for characterizing power of a load according to the present application, and fig. 2 is a schematic structural diagram of a switching power supply system according to the present application. The method for representing the power of the load is applied to a processing module 1 in a switch power supply system, the switch power supply system further comprises a voltage conversion module 2, an error amplification module 3, a comparison module 4, a driving module 5, a first sampling module 6 and a second sampling module 7, and the power supply, the voltage conversion module 2 and the load are sequentially connected; the voltage conversion module 2 is used for converting the output voltage of the power supply when the voltage conversion module is started; the first sampling module 6 is used for sampling the output voltage of the power supply to obtain a first voltage; the second sampling module 7 is used for sampling the voltage of the load to obtain a second voltage; the error amplifying module 3 is used for amplifying an error value between the preset reference voltage and the second voltage by a preset multiple to obtain a third voltage; the comparison module 4 is configured to compare the preset sawtooth wave with the third voltage to obtain a PWM (Pulse Width Modulation) signal; the driving module 5 is used for outputting a driving signal according to the PWM signal to control the voltage conversion module 2 to be switched on or switched off;
a method of characterizing power of a load, comprising:
s11: acquiring a first voltage and a third voltage;
s12: the power of the load is characterized according to the product of the first voltage and the third voltage, and the power of the load is positively correlated with the square of the product of the first voltage and the third voltage.
Pulse width modulation refers to fixing the switching frequency, and the stable output is realized by adjusting the duty ratio. For a fixed output voltage system, a larger output current indicates a larger (heavier) load power, which means that the system needs to provide a larger output power to stabilize the output voltage, and the system adjusts the duty cycle according to the load power. For a typical constant voltage output system of a switching power supply, outputting a constant and high precision voltage is a basic requirement for the system. Nowadays, along with the development of science and technology, electronic products are required to be capable of adapting to more complex environments, the control processing of chips is required to be more intelligent, and the requirement of customers on the overall intellectualization of the application of the system is higher and higher. In order to make the chip control more intelligent, it is very important that the monitoring system transmits real information of the instant load of the system to the chip. Due to the limitation of system topology, a common constant voltage system can monitor output voltage but cannot directly monitor output current, so that the real condition of the power (system output power) of a load cannot be simply obtained.
In the existing switching power supply system based on pulse width modulation, a power supply, a voltage conversion module 2 and a load are connected in sequence, and in order to obtain a stable output voltage of the switching power supply system based on pulse width modulation, when the power of the load changes, the duty ratio of a driving signal of the voltage conversion module 2 is adjusted by sampling the change condition of the output voltage, so that the stable output voltage is achieved.
The power of the load and the duty ratio have a certain relation, and for a specific input line voltage, when the power of the load is increased, the duty ratio is increased to increase the output average current, so that the increased power of the load is met, and the output voltage is stable; when the power of the load is reduced, the duty ratio is reduced to reduce the output average current, so that the reduced power of the load is met, and the output voltage is stable. So for a particular input line voltage, a high duty cycle corresponds to a higher (heavier) power load and a low duty cycle corresponds to a lower (lighter) power load. Meanwhile, for a specific load, in the application of the full-line voltage, namely the range of the input line voltage comprises 85Vac to 265Vac, different input line voltages correspond to different duty ratios, and when the input line voltage is increased, the duty ratio is reduced; when the input line voltage becomes small, the duty ratio becomes large.
Therefore, by combining the above analysis, the power of the load cannot be simply represented by the duty ratio. Since the small duty cycle may be due to the input line voltage being high but the load not being light, or the input line voltage not being high but the load being light. Similarly, a large duty cycle may be due to the input line voltage being low but not heavy, or the input line voltage being low but heavy. In addition, the level of the input line voltage alone has no relationship with the magnitude of the power of the load.
In consideration of the fact that some designs need to know the power of the load and change the logic of the optimal modulation according to the power of the load so as to obtain lower loss or other application indexes, the output current of the pulse width modulation-based switching power supply system needs to be obtained at this moment, but the system generally only monitors the change of the output voltage, but does not directly monitor the change of the output current, is inconvenient to directly monitor the change of the output current, indirectly samples the input current and converts the input current into the average output current, is very tedious to realize and has low operability, so that many systems do not have the function of monitoring the power of the load, and even if the function is realized by using a relatively complex circuit. And the modulation mode cannot be optimized according to the power of the load if the power of the load cannot be directly monitored, and the intelligent degree is limited. Therefore, how to characterize the power of the load is a problem to be solved urgently.
In the scheme, two important parameters, namely the first voltage and the third voltage, which represent the power of the load are determined simultaneously through analysis, and the circuit design of the scheme is easy to realize and obtain the two important parameters. The power of the load is represented by the two important parameters, so that the power of the load can be simply detected, and meanwhile, the corresponding modulation optimization can be performed according to the detection result, so that the work of the switching power supply system has better performance indexes.
Specifically, referring to fig. 2, the second sampling module 7 samples the output voltage (i.e., the voltage of the load) to obtain a second voltage, and then inputs the second voltage into the error amplification module 3, and the error value between the preset reference voltage inside the error amplification module 3 and the second voltage is amplified in the error amplification module 3 to obtain a third voltage. Then, the preset sawtooth wave generated by the processing module 1 and the third voltage pass through the comparison module 4, the comparison is performed in the comparison module 4 to obtain a PWM signal, the driving module 5 generates a driving signal according to the PWM signal to control the voltage conversion module 2 to be turned on or off, here, the turning on or off of the voltage conversion module 2 can be realized by controlling the turning on or off of a controllable switch in the voltage conversion module 2, wherein the duty cycle of the controllable switch can be determined by a clock inside the processing module 1 and is a fixed value.
The first voltage is usually required to be obtained to monitor the input voltage of the switching power supply system, the third voltage is already existed, and the third voltage is a stable value after the switching power supply system is stabilized, so that the third voltage is easy to obtain.
Furthermore, in current applications for switching power supply systems, there is no particularly simple embodiment to directly detect the power of the load, for example, when the voltage conversion module 2 is a Buck converter 21, it is possible to convert the peak current or the average value of the output current of the inductor in the Buck converter 21 into the output power to reflect the power of the load. However, if the switching power supply system is an alternating current input, the method needs to filter a sampled current value in a power frequency envelope into a direct current value, so that a large filter capacitor needs to be externally connected, a PIN is added, and the cost is increased. The technical scheme provided by the application directly multiplexes the existing third voltage, and the sampling of the first voltage is also a line voltage detection scheme existing in most of the existing intelligent application systems, so that multiplexing can be performed under most of conditions, and the implementation is simpler and more convenient.
In summary, the present application provides a method for characterizing the power of a load, which is applied to a processing module 1 in a switching power supply system, where a voltage conversion module 2 in the switching power supply system converts the output voltage of a power supply when the voltage conversion module itself is turned on; the first sampling module 6 samples the output voltage of the power supply to obtain a first voltage; the error amplification module 3 amplifies an error value of a second voltage obtained by sampling the voltage of the load by a preset reference voltage and a second sampling module 7 by a preset multiple to obtain a third voltage; the comparison module 4 compares the preset sawtooth wave with the third voltage to obtain a PWM signal; the driving module 5 outputs a driving signal according to the PWM signal to control the voltage conversion module 2 to be switched on or switched off; the processing module 1 represents the power of the load according to the product of the first voltage and the third voltage, the power of the load is in positive correlation with the square of the product of the first voltage and the third voltage, and the power of the load can be represented without monitoring the change of the output current of the switching power supply system, so that the modulation mode can be optimized according to the power of the load.
On the basis of the above-described embodiment:
as a preferred embodiment, the switching power supply system further includes a multiplier, and before characterizing the power of the load according to the product of the first voltage and the third voltage, the method further includes:
and obtaining the product of the first voltage and the third voltage through a multiplier.
In this embodiment, the product of the first voltage and the third voltage needs to be obtained to represent the power of the load. Specifically, the multiplication of the first voltage and the third voltage can be realized through a multiplier, the realization device is simple and the calculation is convenient, and certainly, the processing module 1 can directly receive the first voltage and the third voltage and then realize the multiplication of the first voltage and the third voltage through a process sequence.
In addition, the power of the load may also be represented by taking the square of the product of the first voltage and the third voltage, and is not particularly limited herein.
As a preferred embodiment, the first sampling module 6 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the power supply and voltage conversion module 2, the other end of the first resistor R1 is connected to one end of the second resistor R2 and the processing module 1, and the other end of the second resistor R2 is grounded.
In this embodiment, the structure of the first sampling module 6 is defined, specifically, the output voltage of the power supply is divided by the first resistor R1 and the second resistor R2, and then the voltage of the second resistor R2 is obtained, and the processing module 1 can obtain the output voltage of the power supply by sampling the voltage of the second resistor R2, that is, the input voltage of the switching power supply system, and the circuit structure is simple, low in cost and easy to implement.
And the first voltage is also a line voltage detection scheme existing in most intelligent application systems, so that the first voltage can be multiplexed in most cases, and the first voltage obtained can be multiplexed here.
In addition, one end of a capacitor can be connected between the first resistor R1 and the second resistor R2, and the other end of the capacitor is grounded, and as shown in fig. 2, when the power supply is alternating current, the capacitor is arranged for filtering; the capacitor is also provided when the power supply is dc, but its capacitance value is smaller than that of ac.
As a preferred embodiment, the second sampling module 7 includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected to the voltage conversion module 2 and the load, the other end of the third resistor R3 is connected to one end of the fourth resistor R4 and the error amplification module 3, and the other end of the fourth resistor R4 is grounded.
In this embodiment, the structure of the second sampling module 7 is defined, specifically, the output voltage of the switching power supply system is divided by the third resistor R3 and the fourth resistor R4, and then the voltage of the fourth resistor R4 is obtained, the processing module 1 can obtain the output voltage of the switching power supply system, that is, the voltage of the load by sampling the voltage of the fourth resistor R4, the circuit structure is simple, the cost is low, and the implementation is easy, and generally in the switching power supply system, the output voltage of the switching power supply system needs to be obtained to monitor the voltage of the load, and here, the obtained output voltage of the switching power supply system may also be multiplexed.
In addition, one end of a capacitor can be connected between the third resistor R3 and the fourth resistor R4, and the other end of the capacitor is grounded, as shown in fig. 2, so that filtering is performed to prevent large ripples in the output voltage of the switching power supply system.
As a preferred embodiment, the error amplifying module 3 is an error amplifier U1, and the error amplifier U1 is configured to amplify an error value between the preset reference voltage input from its positive input terminal and the second voltage input from its negative input terminal by a preset multiple to obtain a third voltage.
In this embodiment, the error amplifier U1 is adopted in the error amplifying module 3, specifically, the error amplifier U1 is preset with a preset multiple of error value amplification, and the preset reference voltage input by the positive input end of the error amplifier U1 may be compared with the second voltage input by the negative input end of the error amplifier U1, and then the error value of the error amplifier U1 is amplified by the preset multiple.
As a preferred embodiment, the comparing module 4 is a comparator U2, the comparator U2 is configured to output a high level when the third voltage input by the positive input terminal of the comparator is greater than the preset sawtooth wave input by the negative input terminal of the comparator, and output a low level when the third voltage input by the positive input terminal of the comparator is less than the preset sawtooth wave input by the negative input terminal of the comparator, so as to obtain the PWM signal.
In this embodiment, the comparing module 4 adopts the comparator U2 to convert the preset sawtooth wave into the PWM signal, specifically, referring to fig. 3a, the positive input terminal of the comparator U2 inputs the comparison voltage
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I.e., the third voltage, the negative input terminal of the comparator U2 inputs the predetermined sawtooth wave and the comparison voltage
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Outputting high level when the voltage is greater than the preset sawtooth wave, and comparing the voltage
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And when the output voltage is less than the preset sawtooth wave, a low level is output, and a PWM signal is finally output, so that the realized electronic device is simple, the input contents of the positive input end and the negative input end can be exchanged, and other suitable changes are carried out, and no special limitation is imposed. In which, as can be seen from figure 3b,
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determines the width of the pulse of the PWM signal, i.e. the width of the voltage converting module 2 in one working period
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Time of internal opening
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Thus, therefore, it is
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And
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there is a certain relationship between them, which can be assumed as
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Wherein
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Is composed of
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And
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simply summarize
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And
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the relationship between them. In addition, duty cycle
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The clock determination for the internal part of the processing module 1 is a preset fixed value.
It should also be noted that, as shown in figure 3b,
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the size of the mixture is gradually increased, and the mixture is gradually increased,
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the larger the width of the pulse of the PWM signal converted from the preset sawtooth wave, that is, the
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The larger. When a switching power supply system inputs a specific line voltage, the more power the load is,
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the larger the value of (3), the larger the pulse width, the larger the average current of the output of the switching power supply system, and the larger the power of the load, so as to maintain the output voltage stable.
In summary, the comparator U2 converts the preset sawtooth wave into the PWM signal, so that the PWM signal is easy and convenient to adjust with low cost.
As a preferred embodiment, after characterizing the power of the load according to the product of the first voltage and the third voltage, the method further includes:
if the power of the load is smaller than the preset power, a control signal is sent to the driving module 5 to control the frequency of the driving signal output by the driving module 5 to be reduced to the preset frequency.
In this embodiment, after the power of the load is characterized, the corresponding modulation mode may be optimized according to the power of the load, so that the switching power supply system has a better working performance index.
Specifically, the voltage conversion module 2 may include a controllable switch to turn on and off itself, and when the frequency of the driving signal generated by the driving module 5 according to the PWM signal is higher, the power consumption of the controllable switch controlled by the driving signal is higher. Therefore, after the power of the load is obtained, if it is determined that the power of the load is smaller than the preset power, the modulation mode of the switching power supply system may be optimized, for example, the operating frequency of the switching power supply system is reduced, that is, the frequency of the driving signal generated according to the PWM signal is reduced, so that the switching power supply system realizes the constancy of the output voltage at a lower operating frequency, and the output power, that is, the power of the load is not changed. And reducing the frequency of the driving signal also reduces the power consumption of the controllable switch controlled by the driving signal, thereby realizing optimization and leading the switching power supply system to have better working performance index. Of course, the specific optimization mode can be various and depends on the actual situation.
As a preferred embodiment, the voltage converting module 2 is a Buck converter 21, and when the switching power supply system operates in the discontinuous mode, characterizing the power of the load according to the product of the first voltage and the third voltage includes:
according to the formula
Figure 230983DEST_PATH_IMAGE001
Controlling the time of conduction of the controllable switch in the Buck converter 21 in one cycle of the acquired driving signal
Figure 745141DEST_PATH_IMAGE002
，
Figure 468247DEST_PATH_IMAGE003
Is the third voltage, and is,
Figure 485881DEST_PATH_IMAGE004
is composed of
Figure 167398DEST_PATH_IMAGE003
And
Figure 903273DEST_PATH_IMAGE002
the coefficient of the conversion relation of (1);
according to the formula
Figure 430069DEST_PATH_IMAGE005
Obtaining input voltage of switch power supply system
Figure 567790DEST_PATH_IMAGE006
，
Figure 653164DEST_PATH_IMAGE007
Is a first voltage to be applied to the first electrode,
Figure 969DEST_PATH_IMAGE008
is composed of
Figure 206822DEST_PATH_IMAGE006
And
Figure 323683DEST_PATH_IMAGE007
the coefficient of the conversion relation of (1);
according to the formula
Figure 956789DEST_PATH_IMAGE009
Obtaining peak current of switch power supply system
Figure 526311DEST_PATH_IMAGE010
，
Figure 535855DEST_PATH_IMAGE011
The inductance of the inductor in the Buck converter 21;
according to the formula
Figure 274266DEST_PATH_IMAGE012
Obtaining input power of switch power supply system
Figure 78274DEST_PATH_IMAGE013
，
Figure 400671DEST_PATH_IMAGE014
Is the frequency of the drive signal;
according to the formula
Figure 948327DEST_PATH_IMAGE015
Characterizing output power of a switching power supply systemRate of formation
Figure 39780DEST_PATH_IMAGE016
Output power of switching power supply system
Figure 14689DEST_PATH_IMAGE016
Is the power of the load or loads and,
Figure 824382DEST_PATH_IMAGE017
in order to switch the transmission efficiency of the power supply system,
Figure 175729DEST_PATH_IMAGE018
is a fixed value for the corresponding switching power supply system.
In this embodiment, the voltage converting module 2 is taken as the Buck converter 21, and the switching power supply system operates in the discontinuous mode, that is, DCM (discontinuous conduction mode), as an example to explain the principle of the present application. For specific circuits in the Buck converter 21, reference may be made to fig. 2.
In particular, the method comprises the following steps of,
Figure 643661DEST_PATH_IMAGE003
i.e. the third voltage, the magnitude of which determines the width of the pulse of the PWM signal, i.e. the width of the voltage converting module 2 in one working period
Figure 320630DEST_PATH_IMAGE019
Time of internal opening
Figure 352040DEST_PATH_IMAGE002
Thus, it is possible to
Figure 241499DEST_PATH_IMAGE003
And
Figure 448489DEST_PATH_IMAGE002
there is a certain relationship between them, which can be assumed as
Figure 889835DEST_PATH_IMAGE001
Wherein
Figure 549486DEST_PATH_IMAGE004
Is composed of
Figure 367270DEST_PATH_IMAGE003
And
Figure 163187DEST_PATH_IMAGE002
the coefficient of the conversion relation of (c); input voltage of switching power supply system
Figure 542478DEST_PATH_IMAGE006
I.e. the output voltage of the power supply, can be based on a formula
Figure 689426DEST_PATH_IMAGE005
To obtain the result of the acquisition,
Figure 920687DEST_PATH_IMAGE008
is composed of
Figure 695745DEST_PATH_IMAGE006
And
Figure 619839DEST_PATH_IMAGE007
if the first sampling module 6 is grounded by two resistors connected in series and then voltage division is performed to realize sampling, the conversion relation coefficient of (2) is obtained
Figure 113137DEST_PATH_IMAGE008
Can be made of
Figure 148089DEST_PATH_IMAGE006
And
Figure 43233DEST_PATH_IMAGE007
the partial pressure coefficient of (a); peak current of switching power supply system
Figure 138228DEST_PATH_IMAGE010
Can be according to the formula
Figure 617357DEST_PATH_IMAGE009
The method comprises the steps of obtaining the data,
Figure 783896DEST_PATH_IMAGE011
the inductance, which is the inductance of the inductor in the Buck converter 21, is fixed for a particular system.
Input power of switching power supply system
Figure 674492DEST_PATH_IMAGE013
Can be according to the formula
Figure 940388DEST_PATH_IMAGE020
To obtain the information of the location of the mobile terminal,
Figure 142699DEST_PATH_IMAGE021
is the frequency of the drive signal, fixed for a particular system; after the switching power supply system enters a steady state, the input power reflects the output power, and the transmission efficiency of the switching power supply system can be assumed at the moment
Figure 785033DEST_PATH_IMAGE017
The parameters obtained by calculation are substituted into the constant parameters to obtain a formula
Figure 389190DEST_PATH_IMAGE022
Output power of switching power supply system
Figure 186507DEST_PATH_IMAGE023
I.e. the power of the load, and due to the output power
Figure 751480DEST_PATH_IMAGE023
By frequency of drive signal
Figure 790981DEST_PATH_IMAGE024
Inductance of the inductor in the Buck converter 21
Figure 125010DEST_PATH_IMAGE025
Efficiency of transmission
Figure 591763DEST_PATH_IMAGE026
Coefficient of conversion relation
Figure 237508DEST_PATH_IMAGE027
Coefficient of conversion relation
Figure 48076DEST_PATH_IMAGE028
And
Figure 626825DEST_PATH_IMAGE029
and
Figure 405425DEST_PATH_IMAGE030
the square of the product of (a) and (b), and for a particular switching power supply system, the frequency of the drive signal
Figure 804045DEST_PATH_IMAGE024
Inductance of the inductor in the Buck converter 21
Figure 591873DEST_PATH_IMAGE025
And transmission efficiency
Figure 25128DEST_PATH_IMAGE026
(the transmission efficiency is assumed here first
Figure 974630DEST_PATH_IMAGE026
Not affected by load), conversion relation coefficient
Figure 96432DEST_PATH_IMAGE027
And coefficient of conversion relation
Figure 422371DEST_PATH_IMAGE028
All are fixed values, and the product of the parameters can be assumed to be the fixed value of the corresponding switch power supply system
Figure 710133DEST_PATH_IMAGE031
(independent of load) and finally
Figure 689590DEST_PATH_IMAGE029
And
Figure 203748DEST_PATH_IMAGE030
the product of (a) reflects the output power
Figure 192433DEST_PATH_IMAGE023
The size of (2).
Therefore, the switching power supply system can be monitored to work in a certain state
Figure 210067DEST_PATH_IMAGE029
And
Figure 390119DEST_PATH_IMAGE030
the output power of the switching power supply system at this time, that is, the power of the load, can be simply calculated. The same-direction comparison can simply define the power of the load at the moment aiming at the switching power supply system, so as to determine whether to change the optimization control logic.
It should be further noted that the technical solution can be divergently popularized to more application scenarios, and is not limited to the Buck converter 21 in this embodiment, nor to the intermittent operation mode in this embodiment, and all the matters are described in this specification
Figure 391573DEST_PATH_IMAGE030
Generating
Figure 793736DEST_PATH_IMAGE032
The PWM modulation of (3) is applicable. Other applications or modes of operation require output power only differently than in the present embodiment
Figure 56090DEST_PATH_IMAGE023
And
Figure 49454DEST_PATH_IMAGE033
the relationship of (c) makes some coefficient corrections. For example, the transmission efficiency is assumed in the present embodiment
Figure 866100DEST_PATH_IMAGE026
The transmission efficiency of some system architectures is not changed in practical application
Figure 603112DEST_PATH_IMAGE026
With the state of the load and the level of the input line voltage having non-negligible fluctuation, it is necessary to aim at the transmission efficiency in the formula
Figure 719973DEST_PATH_IMAGE026
Some modifications are made. But in any case modified by
Figure 353079DEST_PATH_IMAGE033
To characterize the output power
Figure 329125DEST_PATH_IMAGE023
The overall idea and implementation direction (i.e. the power of the load) are the same, and all of them are within the protection scope of the present invention.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a system for characterizing power of a load according to the present application, and the system is applied to a switching power supply system, where the switching power supply system includes a voltage conversion module, an error amplification module, a comparison module, a driving module, a first sampling module and a second sampling module, and a power supply, the voltage conversion module and the load are connected in sequence; the voltage conversion module is used for converting the output voltage of the power supply when the voltage conversion module is started; the first sampling module is used for sampling the output voltage of the power supply to obtain a first voltage; the second sampling module is used for sampling the voltage of the load to obtain a second voltage; the error amplification module is used for amplifying the error value of the preset reference voltage and the second voltage by a preset multiple to obtain a third voltage; the comparison module is used for comparing a preset sawtooth wave with a third voltage to obtain a PWM signal; the driving module is used for controlling the voltage conversion module to be switched on or switched off according to the PWM signal;
a system for characterizing power of a load, comprising:
a voltage acquisition unit 8 for acquiring a first voltage and a third voltage;
and the power acquisition unit 9 is used for representing the power of the load according to the product of the first voltage and the third voltage, and the power of the load is in positive correlation with the square of the product of the first voltage and the third voltage.
For an introduction of a system for characterizing power of a load provided in the present application, please refer to the above embodiments, which are not described herein again.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a processing module provided in the present application, including:
a memory 10 for storing a computer program;
a processor 11 for executing a computer program for implementing the steps of the method for characterizing the power of a load as described above.
For the introduction of a processing module provided in the present application, please refer to the above embodiments, which are not described herein again.
It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A method for representing the power of a load is characterized by being applied to a processing module in a switch power supply system, wherein the switch power supply system further comprises a voltage conversion module, an error amplification module, a comparison module, a driving module, a first sampling module and a second sampling module, and a power supply, the voltage conversion module and the load are sequentially connected; the voltage conversion module is used for converting the output voltage of the power supply when the voltage conversion module is started; the first sampling module is used for sampling the output voltage of the power supply to obtain a first voltage; the second sampling module is used for sampling the voltage of the load to obtain a second voltage; the error amplification module is used for amplifying an error value between a preset reference voltage and the second voltage by a preset multiple to obtain a third voltage; the comparison module is used for comparing a preset sawtooth wave with the third voltage to obtain a PWM signal; the driving module is used for outputting a driving signal according to the PWM signal to control the voltage conversion module to be switched on or switched off;
the method for characterizing the power of the load comprises the following steps:
acquiring the first voltage and the third voltage;
characterizing a power of the load as a product of the first voltage and the third voltage, the power of the load being positively correlated with a square of the product of the first voltage and the third voltage;
the voltage conversion module is a Buck converter, and when the switching power supply system works in a discontinuous mode, characterizing the power of the load according to the product of the first voltage and the third voltage comprises:
according to the formula
Figure RE-DEST_PATH_IMAGE002
Controlling the time of the conduction of a controllable switch in the Buck converter in one period of the obtained driving signal
Figure RE-DEST_PATH_IMAGE004
Said
Figure RE-DEST_PATH_IMAGE006
Is the third voltage, the
Figure RE-DEST_PATH_IMAGE008
Is that it is
Figure 81313DEST_PATH_IMAGE006
And said
Figure 460342DEST_PATH_IMAGE004
The coefficient of the conversion relation of (1);
according to the formula
Figure RE-DEST_PATH_IMAGE010
Obtaining the input voltage of the switching power supply system
Figure RE-DEST_PATH_IMAGE012
Said
Figure RE-DEST_PATH_IMAGE014
Is the first voltage, the
Figure RE-DEST_PATH_IMAGE016
Is that it is
Figure 244627DEST_PATH_IMAGE012
And said
Figure 937777DEST_PATH_IMAGE014
The coefficient of the conversion relation of (1);
according to the formula
Figure RE-DEST_PATH_IMAGE018
Obtaining the peak current of the switching power supply system
Figure RE-DEST_PATH_IMAGE020
Said
Figure RE-DEST_PATH_IMAGE022
Being inductances in said Buck converterInductance value;
according to the formula
Figure RE-DEST_PATH_IMAGE024
Obtaining input power of the switching power supply system
Figure RE-DEST_PATH_IMAGE026
The above-mentioned
Figure RE-DEST_PATH_IMAGE028
Is the frequency of the drive signal;
according to the formula
Figure RE-DEST_PATH_IMAGE030
Characterizing output power of the switching power supply system
Figure RE-DEST_PATH_IMAGE032
Output power of the switching power supply system
Figure 248541DEST_PATH_IMAGE032
Is the power of the load, the
Figure RE-DEST_PATH_IMAGE034
For the transmission efficiency of the switching power supply system, the
Figure RE-DEST_PATH_IMAGE036
Is a fixed value corresponding to the switching power supply system.
2. The method for characterizing power of a load according to claim 1, wherein the switching power supply system further comprises a multiplier, and before characterizing the power of the load according to a product of the first voltage and the third voltage, the method further comprises:
and acquiring the product of the first voltage and the third voltage through the multiplier.
3. The method for characterizing power of a load according to claim 1, wherein the first sampling module comprises a first resistor and a second resistor, one end of the first resistor is connected to the power supply and the voltage conversion module, the other end of the first resistor is connected to one end of the second resistor and the processing module, and the other end of the second resistor is grounded.
4. The method for characterizing power of a load according to claim 1, wherein the second sampling module includes a third resistor and a fourth resistor, one end of the third resistor is connected to the voltage conversion module and the load, the other end of the third resistor is connected to one end of the fourth resistor and the error amplification module, and the other end of the fourth resistor is grounded.
5. The method according to claim 1, wherein the error amplifier is an error amplifier, and the error amplifier is configured to amplify an error value between the predetermined reference voltage input from a positive input terminal of the error amplifier and the second voltage input from a negative input terminal of the error amplifier by a predetermined factor to obtain the third voltage.
6. The method according to claim 1, wherein the comparing module is a comparator for outputting a high level when the third voltage inputted from the positive input terminal of the comparator is greater than the predetermined sawtooth wave inputted from the negative input terminal of the comparator, and outputting a low level when the third voltage inputted from the positive input terminal of the comparator is less than the predetermined sawtooth wave inputted from the negative input terminal of the comparator, thereby obtaining the PWM signal.
7. The method of characterizing power of a load according to claim 1, further comprising, after characterizing power of the load according to a product of the first voltage and the third voltage:
and if the power of the load is smaller than the preset power, sending a control signal to the driving module to control the frequency of the driving signal output by the driving module to be reduced to the preset frequency.
8. A characterization system of load power is characterized by being applied to a switch power supply system, wherein the switch power supply system comprises a voltage conversion module, an error amplification module, a comparison module, a driving module, a first sampling module and a second sampling module, and a power supply, the voltage conversion module and a load are sequentially connected; the voltage conversion module is used for converting the output voltage of the power supply when the voltage conversion module is started; the first sampling module is used for sampling the output voltage of the power supply to obtain a first voltage; the second sampling module is used for sampling the voltage of the load to obtain a second voltage; the error amplification module is used for amplifying the error value of a preset reference voltage and the second voltage by a preset multiple to obtain a third voltage; the comparison module is used for comparing a preset sawtooth wave with the third voltage to obtain a PWM signal; the driving module is used for controlling the voltage conversion module to be switched on or switched off according to the PWM signal;
a system for characterizing power of the load, comprising:
a voltage acquisition unit configured to acquire the first voltage and the third voltage;
a power obtaining unit for characterizing the power of the load according to the product of the first voltage and the third voltage, wherein the power of the load is positively correlated with the square of the product of the first voltage and the third voltage;
the voltage conversion module is a Buck converter, and when the switching power supply system works in an intermittent mode, the power acquisition unit is specifically configured to:
according to the formula
Figure 719843DEST_PATH_IMAGE002
Controlling the time of the conduction of a controllable switch in the Buck converter in one period of the obtained driving signal
Figure 601211DEST_PATH_IMAGE004
Said
Figure 894789DEST_PATH_IMAGE006
Is the third voltage, the
Figure 279634DEST_PATH_IMAGE008
Is that the
Figure 938148DEST_PATH_IMAGE006
And said
Figure 556080DEST_PATH_IMAGE004
The coefficient of the conversion relation of (1);
according to the formula
Figure 387770DEST_PATH_IMAGE010
Obtaining an input voltage of the switching power supply system
Figure 158280DEST_PATH_IMAGE012
The above-mentioned
Figure 722117DEST_PATH_IMAGE014
Is the first voltage, the
Figure 374815DEST_PATH_IMAGE016
Is that the
Figure 213458DEST_PATH_IMAGE012
And said
Figure 816303DEST_PATH_IMAGE014
The coefficient of the conversion relation of (c);
according to the formula
Figure 82199DEST_PATH_IMAGE018
Obtaining the peak current of the switching power supply system
Figure 894298DEST_PATH_IMAGE020
The above-mentioned
Figure 536632DEST_PATH_IMAGE022
The inductance value of an inductor in the Buck converter is obtained;
according to the formula
Figure 812892DEST_PATH_IMAGE024
Obtaining the input power of the switching power supply system
Figure 233378DEST_PATH_IMAGE026
The above-mentioned
Figure 798352DEST_PATH_IMAGE028
Is the frequency of the drive signal;
according to the formula
Figure 978797DEST_PATH_IMAGE030
Characterizing output power of the switching power supply system
Figure 109564DEST_PATH_IMAGE032
Output power of the switching power supply system
Figure 451684DEST_PATH_IMAGE032
Is the power of the load, the
Figure 487642DEST_PATH_IMAGE034
For the transmission efficiency of the switching power supply system, the
Figure 940620DEST_PATH_IMAGE036
Is a fixed value corresponding to the switching power supply system.
9. A processing module, comprising:
a memory for storing a computer program;
a processor for executing the computer program to perform the steps of the method of characterizing the power of a load according to any of the above 1 to 7.
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