CN113765406A - Hiccup control method and device for LLC resonant circuit - Google Patents
Hiccup control method and device for LLC resonant circuit Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a hiccup control method and a hiccup control device for an LLC resonant circuit, wherein the method comprises the following steps: acquiring an actual output value of the LLC resonant circuit; acquiring hiccup duration corresponding to the difference between the set output value and the actual output value; controlling a drive circuit of the LLC resonant circuit to be in an open state, and detecting whether the duration of the drive circuit in the open state is greater than or equal to the hiccup duration; and controlling the drive circuit to be in an off state when the duration is greater than or equal to the hiccup duration. According to the method and the device, the hiccup time corresponding to the difference value between the set output value and the actual output value is obtained, and the drive circuit is controlled to be in the open state or the closed state according to the hiccup time, so that the actual output value is maintained near the set output value, the situation that the drive is always kept in the open state when the actual output value is larger than the set output value is avoided, the control precision of the hiccup control is improved, and the effect of LLC hiccup control can be improved without additionally increasing a hardware circuit.
Description
Technical Field
The invention relates to the technical field of LLC resonant circuits, in particular to a hiccup control method and device of an LLC resonant circuit.
Background
LLC (Lr, Lm, Cr, resonance inductance, excitation inductance, resonance capacitance) hiccups, also called intermittent operation. The LLC generally controls the output voltage or output current by frequency modulation, although the frequency modulation range is very wide, when the LLC is in light load or no load, the frequency is modulated to the maximum and still exceeds the set voltage or set current value, and at this time, an intermittent operation mode is required to control the output voltage or output current within the set value.
When hiccup control is realized in a software mode, the drive is always kept in an open state when the actual value is smaller than the set value, and the drive is always kept in a closed state when the actual value is larger than the set value. When the hiccup control is realized by adopting a hardware mode, an additional hardware circuit is needed, and the hardware cost is overhigh. Thus, current burping control schemes are less effective.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a hiccup control method and device for an LLC resonant circuit, aiming at improving the control precision of hiccup control.
In order to achieve the above object, the present invention provides a hiccup control method for an LLC resonant circuit, which includes the steps of:
acquiring an actual output value of the LLC resonant circuit;
acquiring hiccup duration corresponding to the difference between the set output value and the actual output value;
controlling a drive circuit of the LLC resonant circuit to be in an open state, and detecting whether the duration of the drive circuit in the open state is greater than or equal to the hiccup duration;
and when the duration is greater than or equal to the hiccup duration, controlling the drive circuit to be in an off state.
Optionally, the step of obtaining the hiccup duration corresponding to the difference between the set output value and the actual output value includes:
and after the difference value between the set output value and the actual output value is regulated by a PI controller, the hiccup duration is obtained.
Optionally, the step of controlling a driver circuit of the LLC resonant circuit to be in an on state and detecting whether a duration of the driver circuit being in the on state is greater than or equal to the hiccup duration comprises:
when the hiccup duration is positive, enabling a PWM signal generation module to generate a PWM signal so as to control the driving circuit to be in an open state, and starting and resetting a timing module;
and obtaining the duration through the timing of the timing module, and judging whether the duration is greater than or equal to the hiccup duration.
Optionally, after the step of obtaining the hiccup duration corresponding to the difference between the set output value and the actual output value, the method further includes:
when the hiccup duration is a non-positive number, the PWM signal generation module is prohibited from generating the PWM signal, so that the driving circuit is controlled to be in an off state, and the timing module is not enabled.
Optionally, the step of controlling the driving circuit to be in an off state when the duration is greater than or equal to the hiccup duration comprises:
when the duration is greater than or equal to the hiccup duration, the timing module generates a trigger signal, and the trigger signal is used for forbidding the PWM signal generation module to generate the PWM signal, so that the driving circuit is controlled to be in an off state.
Optionally, the timing module comprises an enhanced acquisition module ECAP;
the PWM signal generation module comprises an enhanced pulse width modulation module EPWM.
Optionally, the hiccup control method for the LLC resonant circuit further includes:
detecting whether the current time point reaches a time point corresponding to the hiccup control period or not;
and if so, executing the step of acquiring the actual output value of the LLC resonant circuit.
Optionally, the step of obtaining an actual output value of the LLC resonant circuit includes:
sampling an output value of the LLC resonant circuit to obtain a sampling value;
and filtering the sampling value to obtain the actual output value.
In order to achieve the above object, the present invention provides a hiccup control device for an LLC resonant circuit, comprising: memory, a processor and a hiccup control program of an LLC resonant circuit stored on the memory and operable on the processor, which when executed by the processor, implements the steps of the method of hiccup control of an LLC resonant circuit as described in any one of the above.
Optionally, the processor includes a digital signal processing chip, and the digital signal processing chip includes a timing module and a PWM signal generation module.
According to the hiccup control method and device for the LLC resonant circuit, provided by the embodiment of the invention, the actual output value of the LLC resonant circuit is obtained; acquiring hiccup duration corresponding to the difference between the set output value and the actual output value; controlling a drive circuit of the LLC resonant circuit to be in an open state, and detecting whether the duration of the drive circuit in the open state is greater than or equal to the hiccup duration; and controlling the drive circuit to be in an off state when the duration is greater than or equal to the hiccup duration. According to the method and the device, the hiccup time corresponding to the difference value between the set output value and the actual output value is obtained, and the drive circuit is controlled to be in the open state or the closed state according to the hiccup time, so that the actual output value is maintained near the set output value, the situation that the drive is always kept in the open state when the actual output value is larger than the set output value is avoided, the control precision of the hiccup control is improved, and the effect of LLC hiccup control can be improved without additionally increasing a hardware circuit.
Drawings
Fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating an embodiment of a hiccup control method for an LLC resonant circuit of the invention;
FIG. 3 is a flow chart illustrating an embodiment of a hiccup control apparatus for an LLC resonant circuit of the invention;
FIG. 4 is a flowchart illustrating an apparatus for controlling hiccup in an LLC resonant circuit according to another embodiment of the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a solution, the hiccup duration corresponding to the difference between the set output value and the actual output value is obtained, and the drive circuit is controlled to be in the open state or the closed state according to the hiccup duration, so that the actual output value is maintained near the set output value, the situation that the drive is always kept in the open state when the actual output value is larger than the set output value is avoided, the control precision of the hiccup control is improved, and the effect of the LLC hiccup control can be improved without additionally increasing a hardware circuit.
As shown in fig. 1, fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention.
The terminal of the embodiment of the invention is a hiccup control device of an LLC resonant circuit.
As shown in fig. 1, the terminal may include: a processor 1001, such as a CPU, ARM, DSP, MCU, communication bus 1002, memory 1003. Wherein a communication bus 1002 is used to enable connective communication between these components. The memory 1003 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). The memory 1003 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the terminal structure shown in fig. 1 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a hiccup control program of the LLC resonant circuit may be included in the memory 1003 as a kind of computer storage medium.
In the terminal shown in fig. 1, the processor 1001 may be configured to invoke a hiccup control program of the LLC resonant circuit stored in the memory 1003 and perform the following operations:
acquiring an actual output value of the LLC resonant circuit;
acquiring hiccup duration corresponding to the difference between the set output value and the actual output value;
controlling a drive circuit of the LLC resonant circuit to be in an open state, and detecting whether the duration of the drive circuit in the open state is greater than or equal to the hiccup duration;
and when the duration is greater than or equal to the hiccup duration, controlling the drive circuit to be in an off state.
Further, the processor 1001 may call a hiccup control program of the LLC resonant circuit stored in the memory 1003, and also perform the following operations:
and after the difference value between the set output value and the actual output value is regulated by a PI controller, the hiccup duration is obtained.
Further, the processor 1001 may call a hiccup control program of the LLC resonant circuit stored in the memory 1003, and also perform the following operations:
when the hiccup duration is positive, enabling a PWM signal generation module to generate a PWM signal so as to control the driving circuit to be in an open state, and starting and resetting a timing module;
and obtaining the duration through the timing of the timing module, and judging whether the duration is greater than or equal to the hiccup duration.
Further, the processor 1001 may call a hiccup control program of the LLC resonant circuit stored in the memory 1003, and also perform the following operations:
when the hiccup duration is a non-positive number, the PWM signal generation module is prohibited from generating the PWM signal, so that the driving circuit is controlled to be in an off state, and the timing module is not enabled.
Further, the processor 1001 may call a hiccup control program of the LLC resonant circuit stored in the memory 1003, and also perform the following operations:
when the duration is greater than or equal to the hiccup duration, the timing module generates a trigger signal, and the trigger signal is used for forbidding the PWM signal generation module to generate the PWM signal, so that the driving circuit is controlled to be in an off state.
Further, the processor 1001 may call a hiccup control program of the LLC resonant circuit stored in the memory 1003, and also perform the following operations:
the timing module comprises an enhanced acquisition module ECAP;
the PWM signal generation module comprises an enhanced pulse width modulation module EPWM.
Further, the processor 1001 may call a hiccup control program of the LLC resonant circuit stored in the memory 1003, and also perform the following operations:
detecting whether the current time point reaches a time point corresponding to the hiccup control period or not;
and if so, executing the step of acquiring the actual output value of the LLC resonant circuit.
Further, the processor 1001 may call a hiccup control program of the LLC resonant circuit stored in the memory 1003, and also perform the following operations:
sampling an output value of the LLC resonant circuit to obtain a sampling value;
and filtering the sampling value to obtain the actual output value.
Referring to fig. 2, in an embodiment, a hiccup control method of an LLC resonant circuit includes the steps of:
step S10, acquiring an actual output value of the LLC resonant circuit;
in this embodiment, the output end of the LLC resonant circuit can be sampled by the sampling circuit to obtain the actual output value of the LLC resonant circuit.
Alternatively, the actual output value of the LLC resonant circuit may comprise the actual output current and/or the actual output voltage of the LLC resonant circuit.
Optionally, after the output end of the LLC resonant circuit is sampled by the sampling circuit, a corresponding sampling value may be obtained, and the sampling value may also include a sampling current value and/or a sampling voltage value. And filtering the sampling value to obtain an actual output value so as to filter out a sampling error caused by high-frequency noise interference, so that the actual output value of the LLC resonant circuit is more accurate. Alternatively, the filtering means may include digital filtering, analog filtering, and the like. For example, the sample values may be filtered by a first order filter.
Alternatively, the step of obtaining the actual output value of the LLC resonant circuit may be performed periodically, i.e. once within a single hiccup control period. Specifically, a time point corresponding to a single hiccup control period may be determined, and whether the current time point reaches the time point is detected, if yes, the step of obtaining an actual output value of the LLC resonant circuit is performed, so as to implement periodic hiccup control.
Step S20, obtaining hiccup duration corresponding to the difference between the set output value and the actual output value;
in the present embodiment, a set output value corresponding to the output current and/or the output voltage of the LLC resonant circuit is set in advance. After the actual output value is obtained, the difference between the set output value and the actual output value can be obtained, and the hiccup duration corresponding to the difference is determined.
Optionally, a preset corresponding relationship exists between the difference value of the set output value and the actual output value and the hiccup duration, and the hiccup duration corresponding to the difference value can be obtained according to the preset corresponding relationship. The hiccup duration indicates an on duration of a driver circuit of the LLC resonant circuit within a single control period.
Optionally, the hiccup duration is positively correlated with the difference, that is, the greater the difference is, the greater the hiccup duration is, so that the open duration of the drive circuit of the LLC resonant circuit in a single control period is increased, the actual output value of the LLC resonant circuit is improved, and the difference is reduced.
Optionally, a PI controller is adopted to realize conversion between the difference value and the hiccup duration, so as to realize accurate adjustment of an actual output value of the LLC resonant circuit. Specifically, the hiccup duration can be obtained after the difference between the set output value and the actual output value is adjusted by the PI controller. For example, the difference between the set output value and the actual output value may be used as an input of a PI controller, and after the difference is adjusted by the PI controller, the output of the PI controller is the corresponding hiccup duration.
Alternatively, after the actual output value is acquired, the actual output value is compared with the corresponding set output value, and if the set output value is greater than the actual output value, it indicates that the actual output value is small, so that step S30 needs to be executed to increase the actual output value by hiccup control of the LLC so that the actual output value is maintained near the set output value.
Optionally, when the set output value is smaller than or equal to the actual output value, it indicates that the actual output value is larger, and at this time, the driving circuit may be controlled to be always in the off state, and after the driving circuit is turned off, the actual output value may also be correspondingly decreased, thereby decreasing the difference.
Step S30, controlling a drive circuit of the LLC resonant circuit to be in an open state, and detecting whether the duration of the drive circuit in the open state is greater than or equal to the hiccup duration;
and step S40, when the duration is greater than or equal to the hiccup duration, controlling the drive circuit to be in a closed state.
In this embodiment, the drive circuit of the LLC resonant circuit can be controlled to be in the on state to increase the actual output value, and timing is started to obtain the duration of the on state of the drive circuit. And detecting whether the duration of the on state of the drive circuit is greater than or equal to the hiccup duration, and if so, closing the drive circuit to avoid the situation that the actual output value continues to increase and exceeds the set output value.
Alternatively, the hiccup duration may be a positive number when the set output value is greater than the actual output value and a non-positive number when the set output value is less than or equal to the actual output value, e.g., the PI controller may determine whether to output a positive or non-positive number based on the difference of the inputs. It should be noted that other controllers may be used to convert the difference between the set output value and the actual output value into the hiccup duration, and the conversion is not limited herein, and for example, a PID controller may be used, and the PID controller may determine whether to output a positive number or a non-positive number according to the input difference.
Optionally, in step S30, when the hiccup duration is positive, the PWM signal generating module is enabled to generate a PWM signal to control the driving circuit to be in the on state, and at the same time, the timing module is enabled and reset, the duration that the driving circuit is in the on state is timed by the timing module, and whether the duration recorded by the timing module is greater than or equal to the hiccup duration is determined. It should be noted that, after the timing module is enabled and reset, the timing module starts timing from zero.
Optionally, when determining whether the duration recorded by the timing module is greater than or equal to the hiccup duration, if the duration is greater than or equal to the hiccup duration, the timing module generates a trigger signal, and the trigger signal is used to prohibit the PWM signal generation module from generating the PWM signal, so as to control the driving circuit to be in the off state, so as to prevent the actual output value from continuing to increase and exceeding the set output value. For example, when the ECAP is used to realize hiccup control of the LLC resonant circuit, the ECAP includes a timing module, the ECAP generates the trigger signal as the high-level interrupt signal, and outputs the high-level interrupt signal to the PWM signal generating module, and the PWM signal generating module stops generating the PWM signal after receiving the trigger signal. The specific form of the trigger signal is not limited to the high-level interrupt signal, and may be other signals.
Alternatively, in step S30, when the hiccup duration is not positive, the PWM signal generation module is disabled to generate the PWM signal, so as to control the driving circuit to be in the off state to decrease the actual output value, so that the actual output value decreases to be close to the set output value, and the timing module is not enabled at this time. Wherein, the function of prohibiting the PWM signal generation module from generating the PWM signal may be implemented by software configuration (i.e., software code).
Optionally, the timing module comprises an enhanced capture module ECAP and the PWM signal generation module comprises an enhanced pulse width modulation module EPWM. Alternatively, the timing module may be another module having a timing function besides the ECAP, for example, the timing module may be a timer, and the ECAP and the timer both belong to modules in a DSP chip (digital signal processing chip). Alternatively, other chips with timing and trigger wave-sealing functions can be used besides the DSP chip. Alternatively, the PWM signal generation module may also be a module that can generate PWM signals in other chips, and is not limited to the EPWM module in the DSP chip.
Optionally, when the timing module includes a timer, the working principle of the timer is as follows: when the duration obtained by the timing of the timer is greater than or equal to the hiccup duration, the timer can generate an interrupt signal, an interrupt program is entered, and the generation of the PWM signal by the PWM signal generation module is prohibited in the interrupt program through software configuration.
In the technical scheme disclosed in this embodiment, through obtaining the hiccup duration that the difference between settlement output value and the actual output value corresponds, it is in open mode or closed state to control drive circuit according to hiccup duration for the actual output value maintains near settlement output value, avoided keeping the drive all the time and being in open mode when actual output value is greater than settlement output value, improved the control accuracy of hiccup control, and need not additionally to increase hardware circuit, can improve the effect of LLC hiccup control.
In another embodiment, based on the embodiment shown in fig. 2, the hiccup control device for the LLC resonant circuit comprises: memory, a processor and a hiccup control program of an LLC resonant circuit stored on the memory and being executable on the processor, the hiccup control program of an LLC resonant circuit implementing the steps of the method of hiccup control of an LLC resonant circuit as described in the above embodiments when executed by the processor.
Optionally, the processor comprises a digital signal processing chip, and the digital signal processing chip comprises a timing module and a PWM signal generation module. Optionally, the timing module comprises an enhanced capture module ECAP and the PWM signal generation module comprises an enhanced pulse width modulation module EPWM. Alternatively, the timing module may be another module having a timing function besides the ECAP, for example, the timing module may be a timer, and the ECAP and the timer both belong to modules in a DSP chip (digital signal processing chip).
Alternatively, other chips with timing and trigger wave-sealing functions can be used besides the DSP chip. Alternatively, the PWM signal generation module may also be a module that can generate PWM signals in other chips, and is not limited to the EPWM module in the DSP chip.
Optionally, as shown in fig. 3, the hiccup controlling apparatus of the LLC resonant circuit may further include:
a proportional-integral (PI) regulator configured to obtain a difference between a set output value and an actual output value of the LLC resonant circuit, and output a hiccup duration corresponding to the difference to a timing module, wherein the hiccup duration is a positive number when the set output value is greater than the actual output value;
the timing module is used for sending a low-level signal to the PWM signal generating module when the hiccup duration is a positive number, starting timing, and sending a high-level interrupt signal to the PWM signal generating module when the timing duration is greater than or equal to the hiccup duration; when the hiccup duration is a non-positive number, such as a negative number, the timing module is not enabled, and at the moment, the wave-sealing function of the PWM signal generation module is realized through software configuration.
And the PWM signal generation module is used for providing a PWM signal for a driving circuit of the LLC resonant circuit, can be passively blocked through software configuration and also has the function of automatically blocking waves through an interrupt signal. The principle of automatic wave blocking of the interrupt signal is that when a high-level interrupt signal is received, the current state is maintained when a low-level signal is received. The wave-blocking means stops generating the PWM signal.
In this embodiment, as shown in fig. 3, the hardware includes a sampling circuit and a drive circuit of the LLC resonant circuit. The sampling circuit is used for sampling the output current and/or voltage of the LLC resonant circuit. The drive circuit is used for controlling the output of the LLC resonant circuit according to the PWM signal.
Optionally, the software includes a proportional integral regulator (PI controller), a timing module, and a PWM signal generation module. For example, as shown in fig. 3, the hiccup control apparatus of the LLC resonant circuit includes a DSP (Digital Signal Processor) chip, which may include a proportional-integral regulator, a timing module, and a PWM Signal generation module. Alternatively, the timing module may be an Enhanced Capture (ECAP) module in the DSP chip, and the PWM signal generating module may be an Enhanced Pulse Width Modulation (EPWM) module in the DSP chip, and it should be noted that both the modules including the timing function and the PWM signal generating function in the chip may be used as the timing module and the PWM signal generating module in the hiccup control apparatus of the LLC resonant circuit.
Optionally, as shown in fig. 3, the hiccup control apparatus of the LLC resonant circuit may further include a filtering module, which may be a first-order filter. The filtering module is used for filtering out sampling errors caused by high-frequency noise interference.
Alternatively, the input signal of the proportional-integral regulator is the error of the set output value and the actual output value, and the output is the hiccup duration T1. When the set output value is larger than the actual output value, the error is a positive value, and when the positive error is larger, the larger the output of the PI controller is, the longer the on-drive time is, the larger the actual voltage is, and the smaller the positive error is. When the set output value is smaller than the actual output value, the error is negative, the output of the PI controller is negative, the time of on driving is 0 at the moment, namely, the PI controller is in an off driving state, the actual output is reduced at the moment, and the negative error is reduced. When the set output value is equal to the actual output value, the error is 0, the output of the PI controller is 0, the on-driving time is 0, that is, the PI controller is in the off-driving state, and the actual output value is maintained at the set output value.
Optionally, the ECAP module has an input of the hiccup duration and an output of the ECAP module is a low level signal or a high level interrupt signal. The ECAP module is provided with a self counter T2, the counter value is continuously counted according to the system time of the DSP, the hiccup duration is reached by the count value, the ECAP module can automatically output a high-level interrupt signal, and otherwise, the ECAP module outputs a low-level signal.
Optionally, the input of the EPWM module is a low level signal or a high level interrupt signal of ECAP, and the output is a PWM pulse wave. When the output of the ECAP is a low level signal, the EPWM module normally outputs a PWM pulse wave; when the ECAP output is a high level interrupt signal, the EPWM module output goes low.
Alternatively, as shown in fig. 4, fig. 4 is a control flow diagram of the hiccup control apparatus of the LLC resonant circuit. After sampling and filtering the LLC resonant circuit, inputting an actual output value to the PI controller, and outputting the hiccup duration by the PI controller. And when the hiccup duration is less than or equal to 0, the drive circuit is closed, and the LLC resonant circuit is resampled until the end of a single control period. When the hiccup duration is greater than 0, the ECAP self counter is reset, T2 is made to be 0, the ECAP outputs a low level signal, timing is started, and the driving circuit is turned on. And turning off the drive circuit when the timing duration is greater than or equal to the hiccup duration until the LLC resonant circuit is resampled after the single control period is finished. And when the timing duration is less than the hiccup duration, detecting whether a single control period is ended, if so, resampling the LLC resonant circuit, and if not, returning to continuously detect whether the timing duration is greater than or equal to the hiccup duration.
In the technical scheme disclosed in the embodiment, the PI controller is introduced into the hiccup scheme, and the method for controlling the hiccup duration by adopting the PI can effectively control the output control precision. The ECAP module has the advantages that functions of timing and generating time interruption are introduced into a hiccup control scheme, hardware circuits such as a hardware comparator and a resistor capacitor are reduced, and cost is saved. The ECAP is triggered in an interruption mode, and the problems of overshoot and large ripple caused by too long control period and incapability of timely switching off the drive are solved. The embodiment adopts software control, has low dependence on sampling precision and control period, and can still meet the requirements of control precision and ripple even if the sampling interference is large and the control period is long.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A hiccup control method of an LLC resonant circuit, characterized in that the hiccup control method of the LLC resonant circuit comprises the following steps:
acquiring an actual output value of the LLC resonant circuit;
acquiring hiccup duration corresponding to the difference between the set output value and the actual output value;
controlling a drive circuit of the LLC resonant circuit to be in an open state, and detecting whether the duration of the drive circuit in the open state is greater than or equal to the hiccup duration;
and when the duration is greater than or equal to the hiccup duration, controlling the drive circuit to be in an off state.
2. The method of claim 1, wherein the step of obtaining a hiccup duration corresponding to the difference between the set output value and the actual output value comprises:
and after the difference value between the set output value and the actual output value is regulated by a PI controller, the hiccup duration is obtained.
3. The method of claim 1, wherein the controlling a driver circuit of the LLC resonant circuit to be in an on state and detecting whether a duration the driver circuit is in the on state is greater than or equal to the hiccup duration comprises:
when the hiccup duration is positive, enabling a PWM signal generation module to generate a PWM signal so as to control the driving circuit to be in an open state, and starting and resetting a timing module;
and obtaining the duration through the timing of the timing module, and judging whether the duration is greater than or equal to the hiccup duration.
4. The method for hiccup control of an LLC resonant circuit of claim 3, further comprising after said step of obtaining a hiccup duration corresponding to the difference between the set output value and the actual output value:
when the hiccup duration is a non-positive number, the PWM signal generation module is prohibited from generating the PWM signal, so that the driving circuit is controlled to be in an off state, and the timing module is not enabled.
5. The method of hiccup control of an LLC resonant circuit of claim 3, wherein the step of controlling the driver circuit in an off state when the duration is greater than or equal to the hiccup duration comprises:
when the duration is greater than or equal to the hiccup duration, the timing module generates a trigger signal, and the trigger signal is used for forbidding the PWM signal generation module to generate the PWM signal, so that the driving circuit is controlled to be in an off state.
6. The hiccup control method of the LLC resonant circuit of any one of claims 3 to 5,
the timing module comprises an enhanced acquisition module ECAP;
the PWM signal generation module comprises an enhanced pulse width modulation module EPWM.
7. The method of hiccup control of an LLC resonant circuit of claim 1, wherein said method of hiccup control of an LLC resonant circuit further comprises:
detecting whether the current time point reaches a time point corresponding to the hiccup control period or not;
and if so, executing the step of acquiring the actual output value of the LLC resonant circuit.
8. The method of hiccup control of an LLC resonant circuit of claim 1, wherein said step of obtaining an actual output value of said LLC resonant circuit comprises:
sampling an output value of the LLC resonant circuit to obtain a sampling value;
and filtering the sampling value to obtain the actual output value.
9. A hiccup control apparatus of an LLC resonant circuit, characterized in that the hiccup control apparatus of the LLC resonant circuit comprises: memory, a processor and a hiccup control program of an LLC resonant circuit stored on said memory and being executable on said processor, the hiccup control program of an LLC resonant circuit implementing the steps of the method of hiccup control of an LLC resonant circuit as claimed in any one of claims 1 to 8 when executed by said processor.
10. The apparatus for hiccup control of an LLC resonant circuit of claim 9, wherein the processor comprises a digital signal processing chip, the digital signal processing chip comprising a timing module and a PWM signal generation module.
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