CN110798943A - Current control circuit, method and driving system for realizing phase interleaving - Google Patents
Current control circuit, method and driving system for realizing phase interleaving Download PDFInfo
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Abstract
The invention discloses a current control circuit, a method and a driving system for realizing phase interleaving. Wherein, this circuit includes: at least two constant current circuits connected in parallel between the direct current buses; each of the constant current circuits includes: the sampling unit is connected with the load at a first end, grounded at a second end through a switch, and connected with the control module at a third end, and is used for sampling and processing the current of the constant current circuit and outputting a sampling signal; the input end of the control module is connected with the sampling unit of each constant current circuit, the output end of the control module is connected with the switch of each constant current circuit, and the control module is used for controlling the on-off duration of the switch according to the sampling signal so as to enable the switch of each constant current circuit to be alternately switched on, thereby realizing the mutual staggering of the current phases of each constant current circuit.
Description
Technical Field
The invention relates to the technical field of electronic power, in particular to a current control circuit, a method and a driving system for realizing phase interleaving.
Background
In the existing circuit with two or more loads, a part of driving power supplies adopt a constant current output control mode. With the diversified development of the working load, the requirements on the power supply are higher and higher, including the service life, the constant current precision, the intelligent control power regulation, the multi-path constant current output and the like of the power supply.
When a plurality of paths of constant current are output in parallel, when the working frequency and the phase of output current of two or more paths of constant current circuits are the same or close to each other, a main loop generates large current ripple waves, the service life of a secondary output capacitor of a driving system is influenced, the service life of the power supply is further influenced, and the capacitor is heated and fails under severe conditions, so that the design requirement on the main loop capacitor is improved, and if the ripple wave requirement is met, the capacitor with a larger capacitance value needs to be selected, and the design of miniaturization and low cost of the power supply is not facilitated.
Aiming at the problem that in the prior art, when the working frequencies and phases of output currents of two or more constant current circuits are the same or close to each other, a main loop generates large current ripples to influence the service life of a power supply, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a current control circuit, a method and a driving system for realizing phase interleaving, and aims to solve the problem that the service life of a power supply is influenced when two or more circuits output in the prior art.
To solve the above technical problem, the present invention provides a current control circuit for implementing phase interleaving, wherein the circuit comprises:
at least two constant current circuits connected in parallel between the direct current buses;
wherein each constant current circuit includes: the sampling unit is connected with the load at a first end, grounded at a second end through a switch, and connected with the control module at a third end, and is used for sampling and processing the current of the constant current circuit and outputting a sampling signal;
the input end of the control module is connected with the sampling unit of each constant current circuit, the output end of the control module is connected with the switch of each constant current circuit, and the control module is used for controlling the on-off duration of the switch according to the sampling signal so as to enable the switch of each constant current circuit to be alternately switched on, and therefore the current phases of each constant current circuit are staggered.
Further, the sampling unit includes:
the inductor is wound on one side of the iron core;
the auxiliary winding and the inductor are symmetrically wound on the other side of the same iron core;
the input end of each comparator is connected with the auxiliary winding, the output end of each comparator is connected with the control module, and different reference voltages are input into the reference voltage input end of each comparator.
Further, the sampling unit further includes:
and the first resistor is connected between the input end of the comparator and the ground wire and used for controlling the lower limit of the voltage of the input end of the comparator.
Further, the sampling unit further includes:
and the second resistor is connected between the first resistor and the inductor and used for controlling the upper limit of the voltage of the input end of the comparator.
Further, each of the constant current circuits further includes:
and the follow current unit is connected between the input end of the load and the second end of the sampling unit in parallel and is used for keeping the current in the circuit when the switch is switched off.
Further, the control module includes:
the acquisition unit is used for acquiring a sampling signal of each constant current circuit;
and the control unit is used for controlling the current phases of the constant current circuits to be mutually staggered according to the sampling signals of the constant current circuits.
Further, the control module is a PWM module.
The invention also provides a driving system which comprises the current control circuit.
The invention also provides a current control method for realizing phase interleaving, wherein the method comprises the following steps:
acquiring a sampling signal of each constant current circuit;
and controlling the current phases of the constant current circuits to be mutually staggered according to the sampling signals of the constant current circuits.
Further, acquiring a sampling signal of each constant current circuit includes:
acquiring initial sampling current of each constant current circuit;
and carrying out different operation processing on the initial sampling current of each constant current circuit to obtain a sampling signal.
Further, controlling the current phases of each constant current circuit to be staggered with each other according to the sampling signal of each constant current circuit, comprises:
outputting corresponding control signals according to the sampling signals of each constant current circuit;
and controlling the current phases of each constant current circuit to be mutually staggered according to the control signal.
Further, controlling the current phases of each constant current circuit to be staggered with each other according to the control signal comprises:
and controlling the switch of each constant current circuit to be alternately conducted according to the control signal, so that the current phases of each constant current circuit are mutually staggered.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the above-mentioned method.
By applying the technical scheme of the invention, when multi-path parallel constant current is output, the on-off duration of the switch is controlled according to the sampling signal of each path, so that the switch of each constant current circuit is alternately switched on, the current phases of each constant current circuit are staggered, the current ripple of a main loop is reduced, the power supply works more stably, the service life and the reliability of the power supply are improved, meanwhile, the current stress of a parallel capacitor of the loop is reduced, the self heating of the capacitor is reduced, the ripple requirement can be met through a smaller capacitor, and the miniaturization and low-cost design of the capacitor are facilitated.
Drawings
FIG. 1 is a block diagram of a current control circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of a current control circuit according to another embodiment of the present invention;
FIG. 3 is a diagram of a conventional parallel LED driving circuit;
FIG. 4 is a diagram of the current waveform through the main loop when the conventional driving circuit is in operation;
FIG. 5 is a block diagram of a current control circuit according to yet another embodiment of the present invention;
fig. 6 is a waveform diagram of an output current of a constant current circuit according to an embodiment of the present invention;
FIG. 7 is a block diagram of a drive system according to an embodiment of the invention;
fig. 8 is a flowchart of a current control method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe various resistances in embodiments of the invention, these resistances should not be limited by these terms. These terms are only used to distinguish between different resistances. For example, a first resistance may also be referred to as a second resistance, and similarly, a second resistance may also be referred to as a first resistance, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The present embodiment provides a current control circuit for implementing phase interleaving, and fig. 1 is a structural diagram of a current control circuit according to an embodiment of the present invention, as shown in fig. 1, the current control circuit includes: at least two constant current circuits connected in parallel between the direct current buses; wherein each constant current circuit includes: a first end of the sampling unit 11 is connected with a load 12, a second end of the sampling unit is grounded through a switch Q, and a third end of the sampling unit is connected with the control module 13 and is used for sampling and processing the current of the constant current circuit and outputting a sampling signal; the input end of the control module 13 is connected to the sampling unit 11 of each constant current circuit, and the output end of the control module is connected to the switch Q of each constant current circuit, and is used for controlling the on-off duration of the switch according to the sampling signal, so that the switch of each constant current circuit is alternately turned on, and the current phases of each constant current circuit are staggered.
In this embodiment, the load 12 is connected in parallel between the positive electrode Vo + of the dc bus and the ground, the sampling unit 11 collects the initial current of the load 12, and performs different processing to make the sampling signals sent by the sampling unit 11 to the control module 13 in each constant current circuit different, the control module 13 controls the switch Q in each constant current circuit to be turned on or off according to the received different sampling signals, specifically, the control module 13 controls the on time of the switch Q in each constant current circuit to be staggered with each other, for example, in a first preset time period, the switch Q in one part of the constant current circuits is controlled to be turned on, the switch Q in the other constant current circuits is controlled to be turned off, in a second preset time period, the switch Q in the other part of the constant current circuits is controlled to be turned on, the switch Q in the other constant current circuits is controlled to be turned off, and so on, when the switches in all the constant current circuits in the system are subjected to the on-off period, the operations are repeatedly executed, and the current limit in each constant current circuit is staggered by controlling the on-off of the switch Q in the constant current circuit, so that the wave crests or wave troughs of the currents in a plurality of constant current circuits are prevented from being overlapped.
Through the current control circuit of this embodiment, when the parallelly connected constant current of multichannel is exported, according to the sampling signal control of every kind switch Q switches on and the length of time of turn-off, makes a plurality of constant current circuit switch Q switches on in turn, and then realizes that every constant current circuit's current phase place is crisscross each other, reduces main loop current ripple, makes power work more stable, improves power life and reliability, simultaneously, reduces the current stress of the parallelly connected electric capacity of return circuit, reduces electric capacity self and generates heat, can satisfy the ripple requirement through less electric capacity, is favorable to electric capacity miniaturization, low-cost design.
Example 2
In this embodiment, taking two parallel constant current circuits as an example in a circuit to describe another optional embodiment of the present invention, fig. 2 is a structural diagram of a current control circuit according to another embodiment of the present invention, and in order to further implement sampling and processing of a current of each constant current circuit, as shown in fig. 2, the sampling unit 11 includes: the inductor is wound on one side of the iron core, the input end of the inductor is connected with a load 12, and the output end of the inductor is grounded through the switch Q; the auxiliary winding and the inductor are symmetrically wound on the other side of the same iron core, when the switch Q is switched on, the current of the inductor rises, induction voltage is generated in the auxiliary winding, and the induction voltage is input into the comparator A; the input end of the comparator A is connected with the auxiliary winding, the output end of the comparator A is connected with the control module 13, different reference voltages are input into the reference voltage input end of each comparator A, after the input voltage of each comparator A is compared with the reference voltage input by the reference voltage input end of the comparator A, a sampling signal is output to the control module 13, and the control module 13 outputs different control signals according to the sampling signal output by the comparator A in each constant current circuit so as to control the conduction time sequence of the switch Q in each constant current circuit.
Specifically, the comparator a compares the input induced voltage with a reference voltage, and outputs a sampling signal according to the comparison result, and for different comparators a, the comparison result is different because the input reference voltage of each comparator a is different, and for the same comparator a, when the difference value between the induced voltage and the reference voltage is increased or decreased and the sign is unchanged, the output is kept constant, for example, in the on state of the switch Q of the first constant current circuit, the current of the inductor in the circuit is increased to cause the induced voltage to increase, the value of the reference voltage of the first constant current circuit is set as the maximum value of the induced voltage, in the increasing process of the induced voltage of the first constant current circuit, the input voltage of the comparator a is always smaller than the reference voltage, the sampling signal of the output of the comparator a is unchanged and is always 1, the control module 13 controls the switch Q of the first constant current circuit to be always on, until the input voltage of the comparator a of the first constant current circuit exceeds the maximum value, the input voltage of the comparator a is greater than the reference voltage, the comparison result changes, the sampling signal output by the comparator a jumps to 0, and the control module 13 controls the switch Q of the constant current circuit to be turned off according to the change of the sampling signal.
Similarly, when the switch Q of the first constant current circuit is turned on, the switch Q of the other constant current circuit is in an off state, the current of the inductor in the circuit drops, causing the induced voltage to drop, the reference voltage value of the other constant current circuit is set to the minimum value of the induced voltage, in the process of the induced voltage drop of another constant current circuit, the input voltage of the comparator A is always greater than the reference voltage, the sampling signal output by the comparator A is unchanged and is always 0, the control module 13 controls the switch Q of another constant current circuit to be turned off until the input voltage of the comparator A of the another constant current circuit is lower than the minimum value, the input voltage of the comparator a is smaller than the reference voltage, the comparison result changes, the sampling signal output by the comparator a jumps to 1, and the control module 13 controls the switch Q of the constant current branch circuit to be turned on according to the change of the sampling signal.
It should be noted that, in other embodiments of the present invention, the sampling unit 11 is not limited to the foregoing implementation, and in addition to the foregoing implementation, the sampling unit 11 may further include: the load 12 is connected to the first end of the input side of the optical coupler, the second end of the input side is grounded through a switch Q, the output end of the input side is connected with a comparator A, and initial sampling current is obtained through the optical coupler.
In practical implementation, in order to control the input voltage of the comparator a not to be zero, as shown in fig. 2, on the basis of the foregoing embodiment, the sampling unit 11 further includes: a first resistor R1, the first resistor R1 is connected between the input end of the comparator A and the ground line, and is used for controlling the lower limit of the voltage of the input end of the comparator A, so as to avoid the input voltage of the comparator A being zero.
In practical implementation, in order to control the input voltage of the comparator a not to exceed the normal operating range of the comparator a, as shown in fig. 2, on the basis of the foregoing embodiment, the sampling unit 11 further includes: and the second resistor R2 and the second resistor R2 are connected between the first resistor R1 and the inductor and used for controlling the upper limit of the voltage of the input end of the comparator A and avoiding the input voltage of the comparator A from exceeding the normal working voltage to cause device damage.
In specific implementation, in order to ensure that the current of each constant current circuit is not zero at any time, as shown in fig. 2, each constant current circuit further includes: and a freewheeling unit D connected in parallel between the input terminal of the load 12 and the second terminal of the sampling unit 11, and configured to maintain the current in the circuit when the switch Q is turned off.
In a specific implementation, in order to control the conduction state of each cross current circuit according to the sampling signal, as shown in fig. 2, the control module 13 includes: an acquisition unit 131 configured to acquire a sampling signal of each constant current circuit; and a control unit 132, configured to control the current phases of each constant current circuit to be staggered with each other according to the sampling signal of each constant current circuit. Specifically, the control module 13 is a PWM module, a signal input end of the PWM module is connected to each sampling unit 11, the function of the obtaining unit 131 is realized by the signal input end, and the PWM module controls the alternate on and off of the switches Q of different constant current circuits by outputting control signals of different time sequences, so as to realize that the current phases of each constant current circuit are staggered.
Example 3
In this embodiment, taking two parallel LED lamps as an example in a circuit, further describing another optional embodiment of the present invention in detail, fig. 3 is a structural diagram of a driving circuit of an existing parallel LED, as shown in fig. 3, two constant current circuits are connected in parallel to output current to drive an LED lamp bead to light, the two constant current circuits work independently, the first constant current circuit includes a freewheeling diode D31, an inductor L31, a switching tube Q31, a sampling resistor R31, and a lamp bead LED31, and the second constant current circuit includes: the driving circuit comprises a freewheeling diode D32, an inductor L32, a switching tube Q32, a sampling resistor R32 and a lamp bead LED32, wherein a current waveform diagram passing through a main loop when the existing driving circuit works is shown in FIG. 4, the current waveform passing through the circuit is sawtooth waves, the maximum peak current and the minimum low-value current exist, when the working frequency and the phase of output current of two paths of constant current circuits are the same or close to each other, the waveforms are overlapped, and the main loop generates large current ripples to influence the service life of a secondary output capacitor of the whole driving system.
Fig. 5 is a structural diagram of a current control circuit according to another embodiment of the present invention, and in order to solve the problem of large ripple of the main loop current of the multi-path parallel constant current circuit, as shown in fig. 5, the current control circuit includes a first constant current circuit, a second constant current circuit, and a PWM module 51, where the first constant current circuit includes: freewheel diode D51, inductance L51, switch tube Q51, lamp pearl LED51, first divider resistance R51, second divider resistance R52 and comparator A51, the second constant current circuit includes: the LED lamp comprises a freewheeling diode D52, an inductor L52, a switching tube Q52, a lamp bead LED52, a third voltage-dividing resistor R53, a fourth voltage-dividing resistor R54 and a comparator A52, wherein the inductor L51 and the inductor L52 are respectively attached with a first auxiliary winding and a second auxiliary winding.
The first auxiliary winding is connected with the input end of a comparator A51, the second auxiliary winding is connected with the input end of a comparator A52 and used for detecting the current passing through an inductor L51 and an inductor L52, and the first constant current circuit and the second constant current circuit are both connected with the PWM module 51; when the switching tube Q51 is turned on, the current of the inductor L51 rises, an induced voltage is generated on the first auxiliary winding, the voltage is divided by the first voltage dividing resistor R51 and the second voltage dividing resistor R52, the obtained voltage is input to the input end of the comparator a51 and is compared with the reference voltage Vref1 of the comparator a51, the output end of the comparator a51 is connected to the PWM module 51, and the PWM module 51 controls the on or off of the switching tube Q51 according to the output signal of the comparator a 51.
Similarly, the operating principle of the second constant current circuit is the same, by setting different reference voltage values Vref1 of the comparator a51 and Vref2 of the comparator a52, the PWM module 51 can output two paths of signals PWM1 and PWM2 to drive the switch tube Q51 and the switch tube Q52 respectively, so as to control the on-time sequences of the first constant current circuit and the second constant current circuit to be different, by the control circuit, the first constant current circuit and the second constant current circuit operate according to a complementary mode, that is, when one path is on, the other path is off, fig. 6 is a waveform diagram of the output current of the constant current circuit according to the embodiment of the present invention, as shown in fig. 6, the half-cycle switch tube in which the current rises is on, the half-cycle switch tube in which the current falls is off, and the on-time of the two paths of switch tubes are complementary, and are alternately on and off. Because the circuit is a constant current circuit, when the switching tube Q51 or the switching tube Q52 is turned off, the freewheeling diode D51 or the freewheeling diode D52 realizes the freewheeling function, so that the currents in the two paths are not zero. As can be seen from fig. 6, after the improvement, the peak value of the main loop ripple will be improved.
The current control circuit of this embodiment, when parallelly connected constant current circuit multichannel, through setting up different reference voltage values that switch on, make the switch tube crisscross conduction in proper order, improve the major loop ripple. At the moment, the parallel constant current circuits do not work independently any more, but are conducted in sequence according to the number of the parallel circuits, so that the purpose of reducing the ripple waves of the main circuit is achieved, and the service life of the capacitor is prolonged.
Example 4
This embodiment provides a driving system, and fig. 7 is a structural diagram of the driving system according to the embodiment of the present invention, as shown in fig. 7, the system includes: the AC/DC module 71 converts input alternating current into direct current, the DC/DC module 72 outputs stable direct current, so as to adapt to a wide input voltage range and provide stable direct current voltage for a post-stage circuit, a primary bus capacitor C71 reduces the output voltage ripple of the DC/DC module 72, a switching tube Q71, a switching tube Q72, an inductor L71, a transformer T71 and a capacitor C72 form a series resonance conversion circuit, the switching tube Q71 and the switching tube Q72 work alternately, the system also comprises the current control circuit through the secondary rectifier diodes D1 and D2 and the secondary output capacitor C3 to output isolated stable direct current voltage.
Example 5
Fig. 8 is a flowchart of a current control method according to an embodiment of the present invention, and as shown in fig. 8, the method includes:
s101, acquiring a sampling signal of each constant current circuit;
in specific implementation, in order to control the conduction state of each switching tube, a signal of each constant current circuit needs to be converted into a control signal of a switch, and therefore, in specific implementation, step S101 includes: acquiring initial sampling current of each constant current circuit; the initial sampling current of each constant current circuit is subjected to different operation processing to obtain a sampling signal, specifically, the initial sampling current passing through the constant current circuit can be converted into an induced voltage signal through an inductor and an auxiliary winding, the induced voltage signal is input into a comparator, the induced voltage signal is converted into a digital signal of 1 or 0 through the comparator and then output to a control module, and further specifically, the input induced voltage is compared with a reference voltage through the comparator, and the sampling signal is output according to the comparison result, for different comparators, because the input reference voltages of each comparator are different, the comparison results are also different, for the same comparator, when the difference value between the induced voltage and the reference voltage is increased or decreased and the positive and negative signs are not changed, the output is kept constant, for example, in the on-off state of the first constant current circuit, the current of the middle inductor of the circuit rises to cause the induced voltage to rise, the value of the reference voltage of the first constant current circuit can be set as the maximum value of the induced voltage, the input voltage of the comparator is always smaller than the reference voltage in the rising process of the induced voltage of the first constant current circuit, the sampling signal output by the comparator is unchanged and always is 1, until the input voltage of the comparator of the first constant current circuit exceeds the maximum value, the input voltage of the comparator is larger than the reference voltage, the comparison result changes, the sampling signal output by the comparator jumps to 0, similarly, when the switch of the first constant current circuit is switched on, the switch of the other constant current circuit is in a switch-off state, the current of the middle inductor of the circuit drops to cause the induced voltage to drop, the reference voltage value of the other constant current circuit can be set as the minimum value of the induced voltage, in the falling process of the induced voltage of the other constant current circuit, the input voltage of the comparator is always greater than the reference voltage, the sampling signal output by the comparator is constant and is always 0, until the input voltage of the comparator of the other constant current circuit is lower than the minimum value, the input voltage of the comparator is smaller than the reference voltage, the comparison result is changed, and the sampling signal output by the comparator jumps to 1.
And S102, controlling the current phases of the constant current circuits to be mutually staggered according to the sampling signals of the constant current circuits.
In specific implementation, in order to control the on state of each constant current circuit according to the different sampling signals output by each constant current circuit, step S102 includes: outputting corresponding control signals according to the sampling signals of each constant current circuit; and controlling the current phases of each constant current circuit to be staggered with each other according to the control signal, specifically, receiving the sampling signal of each constant current circuit by using a control module, wherein the sampling signal of each constant current circuit is 1 or 0, if the received sampling signal is 1, the constant current circuit is controlled to be switched on, if the received sampling signal is 0, the constant current circuit is controlled to be switched off, and the current phases of each constant current circuit are staggered with each other by alternately switching on and off each constant current circuit.
In specific implementation, the switch in each constant current circuit is controlled to be alternately conducted, so that each constant current circuit is alternately conducted.
According to the current control method, the on and off duration of the switch is controlled according to each path of sampling signal, so that the switch of each constant current circuit is alternately switched on, the current phases of each constant current circuit are staggered, the current ripple of a main loop is reduced, the power supply works more stably, the service life and the reliability of the power supply are improved, meanwhile, the current stress of a loop parallel capacitor can be reduced, the self heating of the capacitor is reduced, the ripple requirement can be met through a smaller capacitor, and the miniaturization and low-cost design of the capacitor is facilitated.
Example 6
The present embodiments provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described method.
The above-described circuit embodiments are only illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. A current control circuit, the circuit comprising:
at least two constant current circuits connected in parallel between the direct current buses; wherein each constant current circuit includes: the sampling unit is connected with the load at a first end, grounded at a second end through a switch, and connected with the control module at a third end, and is used for sampling and processing the current of the constant current circuit and outputting a sampling signal;
the input end of the control module is connected with the sampling unit of each constant current circuit, the output end of the control module is connected with the switch of each constant current circuit, and the control module is used for controlling the on-off duration of the switch according to the sampling signal so as to enable the switch of each constant current circuit to be alternately switched on, and therefore the current phases of each constant current circuit are staggered.
2. The circuit of claim 1, wherein the sampling unit comprises:
the inductor is wound on one side of the iron core;
the auxiliary winding and the inductor are symmetrically wound on the other side of the same iron core;
the input end of each comparator is connected with the auxiliary winding, the output end of each comparator is connected with the control module, and different reference voltages are input into the reference voltage input end of each comparator.
3. The circuit of claim 2, wherein the sampling unit further comprises:
and the first resistor is connected between the input end of the comparator and the ground wire and used for controlling the lower limit of the voltage of the input end of the comparator.
4. The circuit of claim 3, wherein the sampling unit further comprises:
and the second resistor is connected between the first resistor and the inductor and used for controlling the upper limit of the voltage of the input end of the comparator.
5. The circuit of claim 2, wherein each of the constant current circuits further comprises:
and the follow current unit is connected between the input end of the load and the second end of the sampling unit in parallel and is used for keeping the current in the circuit when the switch is switched off.
6. The circuit of claim 1, wherein the control module comprises:
the acquisition unit is used for acquiring a sampling signal of each constant current circuit;
and the control unit is used for controlling the current phases of the constant current circuits to be mutually staggered according to the sampling signals of the constant current circuits.
7. The circuit of claim 1, wherein the control module is a PWM module.
8. A drive system comprising a current control circuit according to any one of claims 1 to 7.
9. A method of current control, the method comprising:
acquiring a sampling signal of each constant current circuit;
and controlling the current phases of the constant current circuits to be mutually staggered according to the sampling signals of the constant current circuits.
10. The method of claim 9, wherein obtaining the sampled signal for each constant current circuit comprises:
acquiring initial sampling current of each constant current circuit;
and carrying out different operation processing on the initial sampling current of each constant current circuit to obtain a sampling signal.
11. The method according to claim 9, wherein controlling the current phases of each constant current circuit to be staggered with respect to each other according to the sampling signal of each constant current circuit comprises:
outputting corresponding control signals according to the sampling signals of each constant current circuit;
and controlling the current phases of each constant current circuit to be mutually staggered according to the control signal.
12. The method of claim 11, wherein controlling the current phases of each constant current circuit to be interleaved with each other according to the control signal comprises:
and controlling the switch of each constant current circuit to be alternately conducted according to the control signal, so that the current phases of each constant current circuit are mutually staggered.
13. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 9 to 12.
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