CN113994578A

CN113994578A - Method, device and equipment for inhibiting current ripple and readable storage medium

Info

Publication number: CN113994578A
Application number: CN202180003728.8A
Authority: CN
Inventors: 肖祖勋; 蒋芳林; 刘鹏飞; 吴壬华
Original assignee: Shenzhen Shinry Technologies Co Ltd
Current assignee: Shenzhen Shinry Technologies Co Ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2022-01-28
Also published as: WO2022165795A1

Abstract

The application provides a method for inhibiting current ripples. If the current ripple value is larger than a first threshold value, the first equipment adjusts the bus voltage of the circuit; if the first current ripple value is less than or equal to a first threshold value, the first device does not adjust the bus voltage of the circuit. The purpose of suppressing the current ripple output by the circuit is achieved by dynamically adjusting the bus voltage of the circuit.

Description

Method, device and equipment for inhibiting current ripple and readable storage medium

Technical Field

The present application relates to the field of current ripple suppression, and in particular, to a method, an apparatus, a device, a computer program, a computer-readable storage medium, and a vehicle for current ripple suppression.

Background

In the practical application of the LLC resonant circuit, the output current ripple exceeds the standard is a common problem. The current ripple refers to the Root Mean Square (RMS) value of the alternating current flowing through the capacitor. The current ripple appears as a ripple or ripple voltage on the voltage. The maximum allowable ripple current of a capacitor is limited by the ambient temperature, the surface temperature (and heat dissipation area) of the capacitor, the loss angle (or ESR), and the ac frequency parameters. Temperature is a decisive factor for the lifetime of electrolytic capacitor devices, and therefore the heat loss due to ripple will be a key reference factor for the lifetime of capacitors. At present, there are two main methods for suppressing current ripple: one method is to adjust the parameters of the loop controller, taking a PI controller as an example, the PI controller forms a control deviation according to the threshold value of the current ripple and the current ripple value actually output by the circuit, and linearly combines the proportion and the integral of the control deviation to form a control quantity, so as to control the output current ripple. Another approach is to add a quasi-resonant controller to the circuit to suppress current ripple.

However, the suppression of the current ripple by the above two methods has a significant effect on the stability margin or the dynamic response speed of the loop, and the addition of the quasi-resonant controller complicates the loop control algorithm, thereby causing the performance of the circuit to be degraded. The method for restraining the output current ripple of the LLC resonant circuit based on the dynamic adjustment of the bus voltage is characterized in that the current ripple output by the circuit is collected and calculated in real time, the topological characteristic of the LLC resonant circuit is utilized, the current ripple output by the circuit is restrained by dynamically adjusting the bus voltage value under the condition that loop parameters are not changed, and the problem that the working performance of the circuit is reduced due to the obvious influence on the stability allowance or the dynamic response speed of the loop caused by restraining the current ripple is solved.

Disclosure of Invention

The embodiment of the application provides a method for inhibiting current ripples, which inhibits the current ripples output by a circuit by dynamically adjusting a bus voltage value by using the topological characteristic of an LLC resonant circuit, and avoids the problem that the working performance of the circuit is reduced because the stability allowance or the dynamic response speed of a loop is obviously influenced by inhibiting the current ripples.

In a first aspect, an embodiment of the present application provides a method for suppressing current ripple, including:

the first equipment collects a current ripple value output by the calculation circuit;

the first device determines whether the current ripple value is less than or equal to a first threshold;

if not, the first equipment debugs the bus voltage of the circuit;

if the judgment result is yes, the first equipment does not test the bus voltage of the circuit.

In the embodiment of the application, the first device debugs the bus voltage of the circuit when determining that the ripple value of the current output by the circuit is greater than the first threshold, so that the ripple value of the current output by the bus voltage set by the final circuit corresponding to the first threshold is smaller than the first threshold or smaller than the ripple value of the current output by the original calculating circuit of the first device (the worst case is the same as the ripple value of the current calculated by the first device), thereby achieving the effect of suppressing the current ripple output by the circuit. By the method, the bus voltage value is dynamically adjusted to suppress the current ripple output by the circuit under the condition of not changing the loop parameter, so that the problem that the working performance of the circuit is reduced due to obvious influence on the stability margin or the dynamic response speed of the loop caused by suppressing the current ripple is solved.

In a possible implementation manner, after the first device debugs the bus voltage of the circuit, the method further includes:

and the first equipment adjusts the bus state mark, so that the bus voltage debugging state of the first equipment is a first state.

According to the bus voltage debugging method and device, after the bus voltage of the circuit is debugged, the bus state mark is adjusted, so that the state of the debugged bus voltage enters the initial state, namely the first state, the bus voltage of the circuit is debugged under the condition that the current ripple value is larger than the first threshold value, the current ripple output by the circuit is restrained under the condition that the loop parameter is not changed, and the problem that the working performance of the circuit is reduced due to the fact that the stability allowance or the dynamic response speed of the loop is obviously influenced due to the restraint of the current ripple is avoided.

In one possible implementation, the first device debugging a bus voltage of the circuit includes:

the first equipment judges the bus voltage debugging state of the first equipment through a bus state mark;

if the bus voltage debugging state of the first equipment is a second state, the first equipment starts from the bus voltage of the current circuit, and the bus voltage of the circuit is debugged;

if the bus voltage debugging state of the first device is a first state, the first device debugs the bus voltage of the circuit to be a second threshold value to obtain the debugged bus voltage, adjusts the bus state mark to enable the bus voltage debugging state of the first device to be a second state, and calculates a current ripple value corresponding to the second threshold value; the current ripple value corresponding to the second threshold value is an updated current ripple value, and the second threshold value is an upper limit value of the circuit bus voltage;

the first device judges whether the updated current ripple value is less than or equal to a first threshold value;

if the first device determines that the first device is a power supply device, the first device sets the bus voltage of the circuit to be the second threshold value;

if not, the first equipment continues debugging the bus voltage.

According to the embodiment of the application, under the condition that the current ripple value is larger than the first threshold value, the first equipment judges the state of the debugging bus voltage, and the debugging of the circuit bus voltage is carried out according to the state of the debugging bus voltage, so that the current ripple output by a circuit is inhibited under the condition that loop parameters are not changed, and the problem that the working performance of the circuit is reduced due to the obvious influence on the stability allowance or the dynamic response speed of the loop caused by the inhibition of the current ripple is avoided.

In one possible implementation, the first device continuing to debug the bus voltage includes:

the first equipment debugs the bus voltage by taking a first numerical value as a unit every time to obtain debugged bus voltage, and calculates a current ripple value corresponding to the debugged bus voltage to obtain an updated current ripple value;

if the bus voltage of the circuit is judged to be the debugged bus voltage, the first equipment sets the bus voltage of the circuit to be the debugged bus voltage;

if not, the first equipment updates and records the minimum current ripple value and the corresponding bus voltage; the minimum current ripple value recorded by updating is a current ripple value with a smaller value between the updated current ripple value and the minimum current ripple value before updating;

the first equipment judges whether the debugged bus voltage reaches a third threshold value;

if the judgment result is yes, the first equipment sets the bus voltage of the circuit as the bus voltage corresponding to the minimum current ripple value of the updated record;

if not, the first device debugs the bus voltage by taking the first numerical value as a unit every time to obtain debugged bus voltage, and calculates a current ripple value corresponding to the debugged bus voltage to obtain an updated current ripple value.

In the embodiment of the application, the first device has two bus voltage debugging modes: the first method is that when the ripple value of the current is greater than a first threshold value and the debugged bus voltage does not reach a third threshold value, the first device adjusts the bus voltage down by taking a first numerical value as a unit every time, and in this case, the third threshold value is a lower limit threshold value of the bus voltage; secondly, when the ripple value of the current is larger than the first threshold value and the debugged bus voltage does not reach a third threshold value, the first device up-regulates the bus voltage by taking the first numerical value as a unit every time, and in this case, the third threshold value is an upper limit threshold value of the bus voltage. By the method, the bus voltage value is dynamically adjusted to suppress the current ripple output by the circuit under the condition of not changing the loop parameter, so that the problem that the working performance of the circuit is reduced due to obvious influence on the stability margin or the dynamic response speed of the loop caused by suppressing the current ripple is solved.

In a possible implementation manner, if the bus voltage debug state of the first device is the second state, the first device debugging the bus voltage of the circuit starting from the bus voltage of the current circuit includes:

the first equipment debugs the bus voltage of the circuit by taking a first numerical value as a unit every time to obtain debugged bus voltage, and calculates a current ripple value corresponding to the debugged bus voltage to obtain an updated current ripple value;

if not, the first device executes the step of adjusting the bus voltage of the circuit by taking the first numerical value as a unit every time to obtain the debugged bus voltage, and calculating the current ripple value corresponding to the debugged bus voltage to obtain the updated current ripple value.

In a second aspect, the present application provides a computer program, which includes instructions, and when the computer program is executed by a computer, the first apparatus may perform the method for suppressing current ripple according to the first aspect.

In a third aspect, an embodiment of the present application provides an apparatus for suppressing current ripple, including:

the first current ripple value calculation unit is used for acquiring a current ripple value output by the calculation circuit;

a first judgment unit for judging whether the current ripple value is less than or equal to a first threshold value;

and the bus voltage debugging unit is used for adjusting the bus voltage of the circuit if the first judging unit judges that the bus voltage is not the bus voltage.

In one possible implementation manner, the apparatus for suppressing current ripple further includes:

and the bus state sign adjusting unit is used for adjusting the bus state sign to enable the state of the first equipment debugging bus voltage to be a first state.

In a possible implementation manner, the bus voltage debugging unit further includes:

the first state judgment unit is used for judging the state of the first equipment debugging bus voltage;

the first bus voltage debugging unit is used for debugging the bus voltage of the circuit to a second threshold value after the first state judging unit judges that the state of the first equipment debugging bus voltage is a first state, so as to obtain the debugged bus voltage;

the second current ripple value calculation unit is used for calculating a current ripple value corresponding to the second threshold value;

a second judging unit, configured to judge whether the updated current ripple value is less than or equal to a first threshold;

a first bus voltage setting unit configured to set the bus voltage of the circuit to the second threshold value when the second determination unit determines that the first bus voltage is greater than the second threshold value;

and the second bus voltage debugging unit is used for continuously debugging the bus voltage when the second judging unit judges that the bus voltage is not the bus voltage.

And the third bus voltage debugging unit is used for debugging the bus voltage of the circuit from the bus voltage of the current circuit after the first state judging unit judges that the state of the first equipment debugging bus voltage is the second state.

In one possible implementation manner, the second bus voltage debugging unit includes:

the fourth bus voltage debugging unit is used for debugging the bus voltage by taking the first numerical value as a unit each time to obtain a debugged bus voltage;

the third current ripple value calculation unit is used for calculating a current ripple value corresponding to the debugged bus voltage to obtain an updated current ripple value;

a third judging unit, configured to judge whether the updated current ripple value is less than or equal to a first threshold;

the second bus voltage setting unit is used for setting the bus voltage of the circuit as the debugged bus voltage under the condition that the third judging unit judges that the bus voltage is positive;

and the first updating and recording unit is used for updating and recording the minimum current ripple value and the corresponding bus voltage under the condition that the third judging unit judges that the minimum current ripple value is not the minimum current ripple value.

The first bus voltage judging unit is used for judging whether the debugged bus voltage reaches a third threshold value;

and the third bus voltage setting unit is used for setting the bus voltage of the circuit as the bus voltage corresponding to the minimum current ripple value of the updated record under the condition that the first bus voltage judging unit judges that the bus voltage is positive.

In one possible implementation manner, the third bus voltage debugging unit includes:

the fifth bus voltage debugging unit is used for adjusting the bus voltage of the circuit by taking the first numerical value as a unit each time to obtain the debugged bus voltage;

the fourth current ripple value calculation unit is used for calculating a current ripple value corresponding to the debugged bus voltage to obtain an updated current ripple value;

a fourth judging unit, configured to determine whether the updated current ripple value is less than or equal to a first threshold;

a fourth bus setting unit, configured to set a bus voltage of the circuit as the debugged bus voltage if the fourth determining unit determines that the bus voltage is positive;

the second updating and recording unit is used for updating and recording the minimum current ripple value and the corresponding bus voltage if the fourth judging unit judges that the minimum current ripple value is not the minimum current ripple value;

the second bus voltage judging unit is used for judging whether the debugged bus voltage reaches a third threshold value;

and the fifth bus voltage setting unit is used for setting the bus voltage of the circuit as the bus voltage corresponding to the minimum current ripple value of the updated record when the second bus voltage judging unit judges that the bus voltage is positive.

In a fourth aspect, an embodiment of the present application provides an apparatus for suppressing current ripple, including a processor and a memory;

wherein the memory is configured to store program codes, and the processor is configured to call the program codes stored in the memory to perform the method for suppressing current ripple in the first aspect and various possible implementations thereof.

In a fifth aspect, the present application provides a computer program, which is characterized by including instructions, and when the computer program is executed by a computer, the computer program enables a first device to perform the method for suppressing current ripple in the first aspect and various possible implementations thereof.

In a sixth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program includes program instructions, which, when executed by a processor, cause the processor to execute the method for suppressing current ripple in the first aspect and various possible implementations thereof.

In a seventh aspect, embodiments of the present application provide a vehicle including an apparatus and a device capable of implementing the method for suppressing current ripple in the first aspect and various possible implementations thereof.

Drawings

Fig. 1 is a circuit topology diagram of a vehicle-mounted charger PFC and LLC according to an embodiment of the present application;

fig. 2 is a flowchart of step-down of a bus voltage according to an embodiment of the present disclosure;

fig. 3 is a flowchart of adjusting up a bus voltage according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of an apparatus for suppressing current ripple according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of an apparatus for suppressing current ripple according to an embodiment of the present application.

Detailed Description

In order to make the technical solutions in the embodiments of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The following are detailed below.

The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The first device described in the claims and the description of the present application is a device capable of implementing the current ripple suppression method, wherein the first device includes a processor and a memory; wherein the memory is configured to store program codes, and the processor is configured to call the program codes stored in the memory to perform the method for suppressing current ripple in the first aspect and various possible implementations thereof.

Referring to fig. 1, fig. 1 is a circuit topology diagram of a vehicle-mounted charger PFC and LLC according to an embodiment of the present application. The circuit shown in fig. 1 includes a front stage Power Factor Correction (PFC) circuit and a rear stage LLC resonant circuit. The Power Factor in Power Factor Correction (PFC) refers to the relationship between the effective Power and the total Power consumption (apparent Power), that is, the ratio of the effective Power divided by the total Power consumption (apparent Power). The power factor can measure the effective utilization degree of the power, and when the power factor value is larger, the power utilization rate is higher. The power factor is a parameter for measuring the power efficiency of the electric equipment, and the low power factor represents the low power efficiency. A technique for increasing the power factor of a powered device is known as power factor correction. The principle of the PFC circuit can be understood as compensating for the phase difference between the current and the voltage by adjusting the waveform of the current through a dedicated circuit. LLC resonant circuits have been widely used because of their advantages such as high efficiency, high frequency, and good electromagnetic Compatibility (EMC). The circuit topology shown in fig. 1 includes an ac power supply, switching devices, inductors, capacitors, and transformers. Because differential output current ripple appears at different output voltage points and different output powers, the LLC resonant circuit topology output steady-state characteristic is obtained through research and is greatly influenced by the voltage value of the input bus by analyzing the influence factors of the LLC resonant circuit topology output steady-state characteristic. Therefore, when the ripple value of the current output by the circuit is higher than the preset first threshold value, the bus voltage of the circuit is controlled by adjusting the closing of the related switch device of the PFC circuit, so that the ripple value of the current output by the circuit is reduced, and the purpose of inhibiting the current ripple output by the circuit is achieved.

Referring to fig. 2, fig. 2 is a flowchart of step-down of bus voltage according to an embodiment of the present disclosure. The specific process of the first device for reducing the bus voltage of the circuit to suppress the current ripple output by the circuit under the condition that the bus voltage is reduced by taking the first numerical value as a unit each time in the mode that the first device acquires that the calculated current ripple value is greater than the first threshold value and the first device debugs the bus voltage is as follows:

step S201: the first device determines whether the soft-up of the circuit is complete.

Specifically, before the process of down-regulating the bus voltage of the circuit is performed, it is determined whether the circuit soft-up is completed. The soft start is a process that the voltage of the circuit is slowly increased from zero to a rated voltage, and only when the soft start of the circuit is completed, the circuit is in a stable state, and the current ripple output by the circuit can be inhibited in a mode of debugging the bus voltage of the circuit.

If yes, executing step S202; if not, the whole process is ended, and the bus voltage of the circuit is not tried.

Step S202: the first equipment collects the current ripple value output by the calculation circuit.

Specifically, the first device obtains a current ripple value output by the circuit through a period of time of acquisition and calculation according to the current output in real time. The calculation process of the current ripple value is as follows: max is the maximum value of the output current over time, cur.min is the minimum value of the output current over time, and cur.instant is the real-time value of the output current. And after the circuit is soft started, the first equipment collects and calculates the ripple value of the output current in real time. The first device performs a current ripple data calculation each time it enters a sample data processing cycle (e.g. 20us) for a period of time (e.g. 100ms), and the detailed algorithm is: if the real-time value Cur.Instants of the output current is larger than the maximum value of the output current accumulated before, updating the current real-time value Cur.Instants as the maximum value Cur.max of the output current, otherwise, not processing; and if the real-time output current value Cur. instant is smaller than the previously accumulated minimum output current value, updating the current real-time current value Cur. instant as the minimum output current value Cur. min, otherwise, not processing. 5000 times of current ripple data calculation is accumulated in a period of time (for example, 100ms), and in this way, the maximum value and the minimum value of the current output by the circuit in the period of time (for example, 100ms) can be calculated more accurately. The absolute value of the difference is the current ripple value output in a period of time (e.g. 100 ms). The first device executes step S203 after collecting the current ripple value output by the calculation circuit.

Step S203: the first device determines whether the current ripple value is less than or equal to a first threshold value.

Specifically, the first threshold is a qualified index of a preset current ripple value, when the current ripple value is judged to be the qualified index, the current ripple value reaches the index, the current ripple output by the circuit is inhibited without adjusting the bus voltage of the circuit, and the whole process is finished; if not, the step S204 is executed to indicate that the current ripple value does not meet the index.

Step S204: and the first equipment judges whether the bus voltage debugging state is a first state or not through the bus state adjusting mark.

Specifically, when the first device determines that the ripple value of the current is greater than the first threshold, the first device determines, through the bus state flag, whether the bus voltage debug state is in the first state, and if so, executes step S205; if not, the bus voltage debug status of the first device is the second status, and step S210 is executed.

Step S205: and the first equipment adjusts the bus voltage to a second threshold value to obtain the adjusted bus voltage.

Specifically, after the first device judges that the bus voltage debugging state is the first state through the bus state adjusting mark, the first device adjusts the bus voltage to a second threshold value; wherein the second threshold is an upper threshold of the circuit bus voltage. In the embodiment of the application, tasks executed when the first device is in different bus voltage debugging states are different, and after the first device enters the first state, the executed task is to set the bus voltage as an upper limit threshold; wherein the upper threshold of the bus voltage of the circuit is determined by the endurance of the circuit. After the present step is executed, step S206 is executed.

Step S206: and the first equipment adjusts the bus state mark to enable the bus voltage debugging state to be a second state.

Specifically, in this embodiment of the present application, tasks executed when the first device is in different bus voltage debug states are different, after the first device enters the first state, the executed task is to set the bus voltage as an upper threshold, and the second state is to down-regulate the bus voltage by taking the first value as a unit. The bus voltage debug state is determined by logic and timing. After the present step is executed, step S207 is executed.

Step S207: and the first equipment calculates the current ripple value corresponding to the second threshold value.

Specifically, after the first device adjusts the voltage of the bus to the second threshold, a current ripple value corresponding to the adjusted voltage is calculated, and the current ripple value is an updated current ripple value. The purpose of calculating the current ripple value corresponding to the second threshold is to subsequently judge the current ripple value corresponding to the second threshold and judge whether the current ripple value reaches the standard; if the bus voltage reaches the standard, the bus voltage of the circuit can be set to be a second threshold value, the effect of inhibiting the current ripple output by the circuit is achieved, and the subsequent step of debugging the bus voltage is not needed; and if the bus voltage does not meet the standard, the bus voltage is adjusted downwards on the basis of the second threshold value. After this step is performed, step S208 is performed.

Step S208: the first device determines whether the current ripple value is less than or equal to a first threshold value.

Specifically, the first device determines whether the current ripple value is less than or equal to a first threshold value; and the current ripple value is a current ripple value corresponding to the second threshold value, namely an updated current ripple value. If the current ripple value is judged to be up to the standard, step S209 is executed, that is, the bus voltage of the circuit is set to the second threshold value, and the whole process of debugging the bus voltage of the circuit is finished; if not, the current ripple value does not reach the standard, step S210 is executed to down-regulate the bus voltage of the circuit to obtain the bus voltage corresponding to the current ripple value reaching the standard or the minimum current ripple value.

Step S209: the first device sets a bus voltage of the circuit to a second threshold.

Specifically, in step S208, if the first device determines that the ripple current value corresponding to the second threshold is less than or equal to the first threshold, which indicates that the ripple current value corresponding to the second threshold reaches the index, the first device sets the bus voltage to the second threshold.

Step S210: and the first equipment down-regulates the bus voltage by taking the first numerical value as a unit to obtain the down-regulated bus voltage.

Specifically, when the ripple current value is greater than the first threshold, it is indicated that the ripple current value does not reach the standard, the bus voltage needs to be adjusted downward to suppress the ripple current value output by the circuit, and the unit of the bus voltage is adjusted downward to be the first value, which is 1V in this embodiment.

It should be noted that, when the bus voltage is first adjusted down by the first device, if the debug state of the bus voltage of the first device is the first state, the bus voltage before the adjustment down is the second threshold; if the debug state of the bus voltage of the first device is the second state, the bus voltage before the down-regulation is the bus voltage corresponding to the current ripple value output by the first device collecting and calculating circuit in step S202. After the present step is executed, step S211 is executed.

Step S211: and the first equipment calculates the current ripple value corresponding to the regulated bus voltage to obtain an updated current ripple value.

Specifically, after the bus voltage is adjusted down by 1V, the first device calculates a current ripple value corresponding to the adjusted bus voltage to obtain an updated current ripple value, so as to determine whether the updated current ripple value reaches an index. After the present step is executed, step S212 is executed.

Step S212: the first device determines whether the updated current ripple value is less than or equal to a first threshold.

Specifically, the first device determines whether the updated first threshold is less than or equal to the first threshold, and if yes, the updated current ripple value reaches the index, and step S216 is executed; if not, it is determined that the updated current ripple value does not reach the index, and step S213 is executed.

Step S213: and the first equipment updates and records the minimum current ripple value and the corresponding bus voltage.

Specifically, when the first device determines that the updated current ripple value is greater than the first threshold, the first device updates and records the minimum current ripple value and the bus voltage corresponding to the minimum current ripple value, and the specific operation process includes: and the first equipment compares the updated current ripple value with the minimum current ripple value, and the smaller value of the two values is the updated minimum current ripple value. And then, the first equipment records the updated minimum current ripple value and the corresponding bus voltage.

It should be noted that, when the bus voltage is first adjusted downward by the first device, the minimum ripple current value is the ripple current value output by the first device collecting and calculating circuit in step S202. After the present step is executed, step S214 is executed.

Step S214: and the first equipment judges whether the down-regulated bus voltage reaches a third threshold value.

Specifically, the first device determines whether the down-regulated bus voltage reaches a third threshold, where the third threshold is a lower limit of the circuit bus voltage, and the third threshold is determined by the power grid input voltage and the output voltage of the LLC resonant circuit. If not, executing step S210, and adjusting the bus voltage downward again to obtain a target bus voltage (the current ripple value corresponding to the target bus voltage is the minimum current ripple value or is less than or equal to the first threshold), where the first device sets the bus voltage of the circuit to the target bus voltage to achieve the purpose of suppressing the circuit ripple output by the circuit; if yes, step S215 is executed without adjusting the bus voltage of the circuit down, even if the ripple value of the current corresponding to the bus voltage after the adjustment down does not reach the standard. The lower limit value of the bus voltage is obtained by debugging the circuit state, and the debugging method is that the lower limit value needs to meet the requirement that the output of the LLC resonant circuit is fully loaded and a certain margin is reserved.

Step S215: the first device sets a bus voltage corresponding to the minimum current ripple value as a bus voltage of the circuit.

Specifically, under the condition that the first device determines that the updated ripple current value is greater than the first threshold and the down-regulated bus voltage reaches the third threshold, the first device sets the bus voltage of the circuit to the bus voltage corresponding to the minimum ripple current value, so that the current ripple output by the circuit is suppressed.

Step S216: the first device sets a bus of the circuit to a down-regulated bus voltage.

Specifically, in step S214, when the first device determines that the updated ripple value of the current is smaller than the first threshold, the first device sets the bus voltage of the circuit to the adjusted bus voltage, so as to suppress the ripple of the output current of the circuit.

Step S217: the first device adjusts the bus state flag so that the state of the first device debugging the bus voltage is a first state.

Specifically, after the bus voltage of the circuit is set, the first device adjusts the state of the debug bus voltage to a first state (initial state) through the bus state adjustment flag, and finishes the debugging of the bus voltage in the current round.

In this embodiment, the first device calculates a ripple value of a current output by the circuit, and when the ripple value of the current is greater than a first threshold, the bus voltage of the circuit is adjusted downward to obtain a target bus voltage (where the ripple value of the current corresponding to the target bus voltage is a minimum ripple value of the current or is less than or equal to the first threshold), and the bus voltage of the circuit is set as the target bus voltage, so as to suppress a ripple of the current output by the circuit. The first equipment regulates the bus voltage in a preset bus voltage regulation interval by taking a first numerical value as a unit every time, when the current ripple value corresponding to the regulated bus voltage is smaller than or equal to a first threshold (namely the current ripple value reaches an index), the regulation is stopped, the bus voltage of the circuit is set to be regulated voltage, and the effect of inhibiting the current ripple output by the circuit is achieved; when the bus voltage after down regulation reaches the third threshold (that is, the lower limit value of the bus voltage), if the bus voltage after down regulation is still greater than the first threshold, because the bus voltage after down regulation has reached the critical value of the down regulation interval, the first device does not down regulate the bus voltage any more, and sets the bus voltage corresponding to the minimum current ripple value during down regulation as the bus voltage of the circuit, because the minimum current ripple value is smaller than the current ripple value output by the first device calculation circuit just started (in the most extreme case, the minimum current ripple value is equal to the current ripple value output just started), the purpose of suppressing the current ripple output by the circuit through the bus voltage of the down regulation circuit is also achieved. By the way of dynamically adjusting the bus voltage of the circuit, the current ripple output by the circuit is inhibited under the condition of not changing loop parameters, and the problem that the working performance of the circuit is reduced because the stability allowance or the dynamic response speed of the loop is obviously influenced by inhibiting the current ripple is avoided.

Referring to fig. 3, fig. 3 is a flowchart of adjusting up the bus voltage according to an embodiment of the present disclosure. When the first device acquires that the calculated current ripple value is greater than the first threshold value and the bus voltage is debugged by the first device in a manner that the bus voltage is adjusted up by taking the first numerical value as a unit each time, a specific flow of suppressing the current ripple output by the circuit by adjusting the bus voltage of the circuit by the first device is as follows:

for specific implementation of steps S301 to S304, reference may be made to the implementation of steps S201 to S204 in the foregoing embodiment, and details are not described here again.

Step S305: and the first equipment adjusts the bus voltage to be a second threshold value, and the adjusted bus voltage is obtained.

Specifically, after the first device judges that the bus voltage debugging state is the first state through the bus state adjusting mark, the first device adjusts the bus voltage to a second threshold value; and the second threshold is a lower threshold of the circuit bus voltage. In the embodiment of the application, tasks executed when the first device is in different bus voltage debugging states are different, and after the first device enters the first state, the executed task is to set the bus voltage as a lower limit threshold; and after the first equipment enters the second state, the executed task is to adjust the bus voltage up by taking the first numerical value as a unit. Wherein the lower threshold of the bus voltage is determined by the endurance of the circuit. After the present step is executed, step S306 is executed.

Step S306: and the first equipment adjusts the bus state mark to enable the bus voltage debugging state to be a second state.

Specifically, in the embodiment of the present application, the tasks executed when the first device is in different bus voltage debugging states are different, and after the first device enters the first state, the executed task is to set the bus voltage as the lower limit threshold; and after the first equipment enters the second state, the executed task is to adjust the bus voltage up by taking the first numerical value as a unit. Adjusting the bus voltage debug state is determined by logic and timing. After the present step is executed, step S307 is executed.

Step S307: and the first equipment calculates the current ripple value corresponding to the second threshold value.

Specifically, after the bus voltage is adjusted to the second threshold value by the first device, a current ripple value corresponding to the adjusted voltage is calculated, and the current ripple value is an updated current ripple value. The purpose of calculating the current ripple value corresponding to the second threshold is to subsequently judge the current ripple value corresponding to the second threshold and judge whether the current ripple value reaches the standard; if the bus voltage reaches the standard, the bus voltage of the circuit can be set to be a second threshold value, the effect of inhibiting the current ripple output by the circuit is achieved, and the subsequent step of debugging the bus voltage is not needed; and if the bus voltage does not meet the standard, the bus voltage is adjusted up on the basis of the second threshold value. After this step is performed, step S308 is performed.

For specific implementation of step S308 to step S309, reference may be made to the implementation of step S208 to step S209 in the foregoing embodiment, and details are not described here.

Step S310: and the first equipment up-regulates the bus voltage by taking the first numerical value as a unit to obtain the up-regulated bus voltage.

Specifically, when the current ripple value is greater than the first threshold, it is indicated that the current ripple value does not reach the standard, and the bus voltage needs to be adjusted up to suppress the current ripple value output by the circuit. The unit of the bus voltage is adjusted up to be a first value, and the first value is 1V in this embodiment.

It should be noted that, when the bus voltage is first adjusted by the first device, if the debug state of the bus voltage of the first device is the first state, the bus voltage before the adjustment is the second threshold; if the debugging state of the bus voltage of the first device is the second state, the bus voltage before being adjusted is the bus voltage corresponding to the current ripple value output by the acquisition and calculation circuit of the first device in step S302. After the present step is executed, step S311 is executed.

Step S311: and the first equipment calculates the current ripple value corresponding to the bus voltage after the adjustment to obtain an updated current ripple value.

Specifically, after the bus voltage is adjusted by 1V, the first device calculates a current ripple value corresponding to the adjusted bus voltage to obtain an updated current ripple value, so as to determine whether the updated current ripple value reaches an index. After the present step is executed, step S312 is executed.

Step S312: the first device determines whether the updated current ripple value is less than or equal to a first threshold.

Specifically, the first device determines whether the updated first threshold is less than or equal to the first threshold, and if yes, the updated current ripple value reaches the index, and then step S316 is executed; if not, it is determined that the updated current ripple value does not reach the index, and step S313 is executed.

Step S313: and the first equipment updates and records the minimum current ripple value and the corresponding bus voltage.

It should be noted that, when the bus voltage is adjusted up for the first time by the first device, the minimum ripple current value is the ripple current value output by the collecting and calculating circuit of the first device in step S302. After this step is performed, step S314 is performed.

Step S314: and the first equipment judges whether the bus voltage after being adjusted up reaches a third threshold value.

Specifically, the first device determines whether the bus voltage after being adjusted up reaches a third threshold, where the third threshold is an upper limit value of the bus voltage of the circuit, and the third threshold is determined by a withstand voltage value of a PFC circuit component. If not, executing step S310, and increasing the bus voltage again to obtain a target bus voltage (where a current ripple value corresponding to the target bus voltage is a minimum current ripple value or is less than or equal to a first threshold), where the first device sets the bus voltage of the circuit to the target bus voltage to achieve a purpose of suppressing a circuit ripple output by the circuit; if yes, step S315 is executed without increasing the bus voltage of the circuit even if the ripple value of the current corresponding to the bus voltage after the increase does not reach the standard. The upper limit threshold of the bus voltage is obtained by debugging the circuit state, and the debugging method is that the upper limit threshold needs to meet the requirement of full output load of the LLC resonant circuit and a certain margin is reserved.

Step S315: the first device sets a bus voltage corresponding to the minimum current ripple value as a bus voltage of the circuit.

Specifically, under the condition that the first device determines that the updated current ripple value is greater than the first threshold and the adjusted bus voltage reaches the third threshold, the first device sets the bus voltage of the circuit to the bus voltage corresponding to the minimum current ripple value, so that the current ripple output by the circuit is suppressed.

Step S316: the first device sets a bus of the circuit to an up-regulated bus voltage.

Specifically, in step S312, when the first device determines that the updated ripple value of the current is smaller than the first threshold, the first device sets the bus voltage of the circuit to the bus voltage after the bus voltage is adjusted up, so as to suppress the ripple of the output current of the circuit.

Step S317: the first device adjusts the bus state flag so that the state of the first device debugging the bus voltage is a first state.

In this embodiment, the first device calculates a ripple value of a current output by the circuit, and when the ripple value of the current is greater than a first threshold, adjusts a bus voltage of the circuit up to obtain a target bus voltage (where the ripple value of the current corresponding to the target bus voltage is a minimum ripple value of the current or is less than or equal to the first threshold), and sets the bus voltage of the circuit as the target bus voltage to suppress a ripple of the current output by the circuit. The first equipment is used for increasing the bus voltage by taking a first numerical value as a unit every time in a preset bus voltage increasing interval, when the current ripple value corresponding to the increased bus voltage is smaller than or equal to a first threshold value (namely the current ripple value reaches an index), the increasing is stopped, the bus voltage of the circuit is set to be the increased voltage, and the effect of inhibiting the current ripple output by the circuit is achieved; when the bus voltage after the up-regulation reaches the third threshold (that is, the upper limit value of the bus voltage), the bus voltage after the up-regulation is still larger than the first threshold, because the bus voltage after the up-regulation reaches the critical value of the up-regulation interval, the first device does not up-regulate the bus voltage any more, and sets the bus voltage corresponding to the minimum current ripple value during the up-regulation as the bus voltage of the circuit, because the minimum current ripple value is smaller than the current ripple value output by the first device calculation circuit just started (in the most extreme case, the minimum current ripple value is equal to the current ripple value output just started), the purpose of suppressing the current ripple output by the circuit through the bus voltage of the up-regulation circuit is also achieved. By means of dynamically adjusting the bus voltage of the circuit, the current ripple output by the circuit is inhibited under the condition that loop parameters are not changed, and the problem that the working performance of the circuit is reduced due to obvious influence on the stability allowance or dynamic response speed of the loop caused by inhibiting the current ripple is solved.

The method of the embodiment of the present application is explained in detail above, and the related device, apparatus and vehicle of the embodiment are provided below.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a device for suppressing current ripple according to an embodiment of the present application, where the device for suppressing current ripple 4 may include a first current ripple value calculation unit 401, a first judgment unit 402, and a bus voltage adjustment unit 403, where details of each unit are as follows:

a first current ripple value calculation unit 401, configured to collect a current ripple value output by the calculation circuit;

a first judging unit 402, configured to judge whether the current ripple value is less than or equal to a first threshold;

a bus voltage debugging unit 403, configured to adjust the bus voltage of the circuit if the first determining unit 402 determines that the bus voltage is not the bus voltage.

In a possible implementation manner, the apparatus 4 for suppressing current ripple further includes:

and the bus state sign adjusting unit is used for adjusting and adjusting the bus state sign to enable the state of the first equipment debugging bus voltage to be a first state.

In a possible implementation manner, the bus voltage debugging unit 403 further includes:

Referring to fig. 5, fig. 5 is a schematic structural diagram of an apparatus for suppressing current ripple according to an embodiment of the present application, where the apparatus for suppressing current ripple 5 may include a memory 501 and a processor 502, where each unit is described in detail as follows:

the memory 501 is used to store program codes.

The processor 502 is configured to call the program code stored in the memory to perform the following steps:

collecting a current ripple value output by a computing circuit;

judging whether the current ripple value is less than or equal to a first threshold value;

if the current ripple value is larger than a first threshold value, the first equipment debugs the bus voltage of the circuit;

if the current ripple value is less than or equal to a first threshold value, the first device does not try the bus voltage of the circuit.

In one possible implementation, the processor 502 is further configured to: and adjusting the bus state mark to enable the state of the first equipment debugging bus voltage to be a first state.

In one possible implementation, if the ripple current value is greater than the first threshold, the processor 502 debugging the bus voltage of the circuit includes: judging the state of the debugging bus voltage through the bus state mark;

if the state of debugging the bus voltage is a second state, starting from the bus voltage of the current circuit, debugging the bus voltage of the circuit;

if the state of debugging the bus voltage is the first state, debugging the bus voltage of the circuit to be a second threshold value to obtain the debugged bus voltage; adjusting the bus state mark to enable the state of the first equipment debugging bus voltage to be a second state, and calculating a current ripple value corresponding to the second threshold value;

judging whether the updated current ripple value is less than or equal to a first threshold value;

if the judgment result is yes, setting the bus voltage of the circuit as the second threshold value;

if not, the bus voltage is continuously debugged.

In one possible implementation, the processor 502 continues to debug the bus voltage, including: debugging the bus voltage by taking a first numerical value as a unit each time to obtain a debugged bus voltage, and calculating a current ripple value corresponding to the debugged bus voltage to obtain an updated current ripple value;

if the bus voltage of the circuit is judged to be the debugged bus voltage, setting the bus voltage of the circuit as the debugged bus voltage;

if not, updating and recording the minimum current ripple value and the corresponding bus voltage;

judging whether the debugged bus voltage reaches a third threshold value;

if the judgment result is yes, setting the bus voltage of the circuit as the bus voltage corresponding to the minimum current ripple value of the updated record;

if not, debugging the bus voltage by taking the first numerical value as a unit every time to obtain a debugged bus voltage, and calculating a current ripple value corresponding to the debugged bus voltage to obtain an updated current ripple value.

In a possible implementation manner, if the state of the debug bus voltage is the second state, the processor 502 starts from the bus voltage of the current circuit to debug the bus voltage of the circuit, including:

adjusting the bus voltage of the circuit by taking the first numerical value as a unit each time to obtain a debugged bus voltage, and calculating a current ripple value corresponding to the debugged bus voltage to obtain an updated current ripple value;

judging whether the debugged bus voltage reaches a third threshold value;

if not, the step of adjusting the bus voltage of the circuit by taking the first numerical value as a unit every time to obtain an updated and debugged bus voltage, and calculating a current ripple value corresponding to the debugged bus voltage to obtain an updated current ripple value is executed.

The present embodiment provides a computer program including instructions, which when executed by a computer, enables a first device to perform the method for suppressing current ripple described in the above embodiments.

The present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program includes program instructions, which, when executed by a processor, cause the processor to execute the method for suppressing current ripple described in the foregoing embodiment.

The embodiment of the application provides a vehicle, and the device and the equipment for realizing the method for inhibiting the current ripple can be realized.

It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the above-described modules is merely a logical division, and an actual implementation may have another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.

The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

In addition, functional modules in the embodiments of the present application may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.

The foregoing detailed description of the embodiments of the present invention has been presented for purposes of illustration and description, and is intended to be exhaustive or to limit the invention to the precise forms disclosed; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific implementation and application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A method of suppressing current ripple, comprising:

if not, the first equipment debugs the bus voltage of the circuit;

2. The method of claim 1, wherein the first device, after debugging a bus voltage of the circuit, further comprises:

3. The method of any of claims 1-2, wherein the first device debugging a bus voltage of the circuit comprises:

if the bus voltage debugging state of the first equipment is a second state, the first equipment starts from the bus voltage of the current circuit, and the bus voltage of the circuit is debugged; the bus voltage of the current circuit is the bus voltage corresponding to the current ripple value;

if the bus voltage debugging state of the first device is a first state, the first device debugs the bus voltage of the circuit to be a second threshold value to obtain the debugged bus voltage, adjusts the bus state mark to enable the bus voltage debugging state of the first device to be a second state, and calculates a current ripple value corresponding to the second threshold value; the current ripple value corresponding to the second threshold value is an updated current ripple value;

if not, the first equipment continues debugging the bus voltage.

4. The method of claim 3, wherein the first device continuing to debug the bus voltage comprises:

5. The method of claim 3, wherein debugging the bus voltage of the circuit by the first device starting from the bus voltage of the current circuit if the bus voltage debugging state of the first device is the second state comprises:

6. A current ripple suppression apparatus, comprising:

and the bus voltage debugging unit is used for debugging the bus voltage of the circuit if the first judging unit judges that the bus voltage is not the bus voltage.

7. An apparatus for suppressing current ripple, comprising a memory and a processor;

wherein the memory is configured to store program code, and the processor is configured to call the program code stored in the memory to perform the method for suppressing current ripple according to any one of claims 1 to 5.

8. A computer program comprising instructions which, when executed by a computer, cause a first device to perform the method for suppressing current ripple of any one of claims 1 to 5.

9. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program comprising program instructions that, when executed by a processor, cause the processor to perform the method of suppressing current ripple according to any one of claims 1 to 5.

10. A vehicle characterized by comprising an apparatus and a device capable of implementing the method of suppressing current ripple according to any one of claims 1 to 5.