CN112671311B - Voltage control method and device, driving circuit and air conditioner - Google Patents
Voltage control method and device, driving circuit and air conditioner Download PDFInfo
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Abstract
The embodiment of the application provides a voltage control method, a voltage control device, a driving circuit and an air conditioner, and relates to the technical field of motor driving. According to the scheme, the input voltage, the target voltage and the target period are obtained, the target voltage is used as the average voltage of the input voltage in one target period to determine the first time and the second time, and the driving pulse is generated according to the first time and the second time to control the switch module to output the target voltage. The target voltage is used as the average voltage of the input voltage in a target period, and the first time and the second time are calculated, so that the duty ratio of the control signal is determined according to the first time and the second time, the frequency conversion and amplitude modulation of the output voltage can be realized, the random change of the frequency of the output voltage can be realized, and the electric energy can be effectively saved.
Description
Technical Field
The invention relates to the technical field of motor driving, in particular to a voltage control method, a voltage control device, a driving circuit and an air conditioner.
Background
The wide application of variable frequency air conditioner is in present production and life, and the fan of outer machine of current air conditioner can be divided into two types: alternating current fan and direct current fan.
In the prior art, an alternating current fan is usually directly connected with the voltage of a power grid, and a frequency conversion function is not adopted, so that the rotating speed of the fan is fixed, and energy waste exists.
Disclosure of Invention
The invention solves the problem of how to improve the energy utilization efficiency and realize the change of different rotating speeds of the fan.
In order to solve the above problem, an embodiment of the present application provides a voltage control method, where the voltage control method includes:
acquiring an input voltage, a target voltage and a target period;
taking the target voltage as an average voltage of the input voltage in one target period to determine a first time and a second time, wherein the first time is a time when a positive voltage in the input voltage is effective, and the second time is a time when a negative voltage in the input voltage is effective;
and generating a driving pulse according to the first time and the second time so as to control a switch module to output the target voltage.
It can be understood that, by using the target voltage as the average voltage of the input voltage in one target period and calculating the first time and the second time, the duty ratio of the control signal is determined by the first time and the second time, so that not only can the frequency conversion and amplitude modulation of the output voltage be realized, but also the frequency of the output voltage can be arbitrarily changed, and the electric energy can be effectively saved.
In an alternative embodiment, the step of determining the first time and the second time by using the target voltage as an average voltage of the input voltage in one target period comprises:
determining a first voltage and a second voltage according to the input voltage, wherein the first voltage is a positive voltage in the input voltage, and the second voltage is a negative voltage in the input voltage;
and determining the first time and the second time according to the acquired target voltage, the acquired target period, the first voltage and the second voltage.
It is to be understood that by differentiating the input voltage into a positive voltage and a negative voltage, it is advantageous to subsequently calculate the average voltage of the input voltage over a target period.
In an optional embodiment, the target voltage, the target period, the first voltage, the second voltage, the first time, and the second time satisfy the following equation:
wherein v iso(t) is the target voltage, vu(t) is the first voltage, vd(T) is the second voltage, TsIs the target period, tuIs the first time, tdIs the second time.
In an alternative embodiment, the first voltage satisfies the equation:
wherein k is not less than 0, k is even number, and VimIs the amplitude of the input voltage, w1Is the angular frequency of the input voltage.
In an alternative embodiment, the second voltage satisfies the equation:
wherein k is not less than 0, k is even number, VimIs the amplitude of the input voltage, w1Is the angular frequency of the input voltage.
In a second aspect, an embodiment of the present application further provides a voltage control apparatus, where the voltage control apparatus includes:
the parameter acquisition module is used for acquiring input voltage, target voltage and a target period;
a processing module, configured to use the target voltage as an average voltage of the input voltage in one target period to determine a first time and a second time, where the first time is a time when a positive voltage in the input voltage is valid, and the second time is a time when a negative voltage in the input voltage is valid;
the processing module is further used for generating a driving pulse according to the first time and the second time so as to control the switch module to output the target voltage.
In an optional embodiment, the processing module is configured to determine a first voltage and a second voltage according to the input voltage, where the first voltage is a positive voltage of the input voltage, and the second voltage is a negative voltage of the input voltage;
the processing module is further configured to determine the first time and the second time according to the obtained target voltage, the obtained target period, the first voltage, and the second voltage.
In an optional embodiment, the target voltage, the target period, the first voltage, the second voltage, the first time, and the second time satisfy the following equation:
wherein v iso(t) is the target voltage, vu(t) is the first voltage, vd(T) is the second voltage, TsIs the target period, tuIs the first time, tdIs the second time.
In a third aspect, an embodiment of the present application further provides a driving circuit, where the driving circuit includes a controller, a transformer, and a switch module, the transformer is electrically connected to the switch module, and the controller is electrically connected to the switch module;
the transformer is used for converting a power supply voltage into the input voltage;
the controller is used for acquiring the input voltage, a target voltage and a target period, and taking the target voltage as an average voltage of the input voltage in one target period to determine a first time and a second time, wherein the first time is a time when a positive voltage in the input voltage is effective, and the second time is a time when a negative voltage in the input voltage is effective;
the controller is further used for generating a driving pulse according to the first time and the second time so as to control the switch module to output the target voltage.
In a fourth aspect, an embodiment of the present application further provides an air conditioner, where the air conditioner includes a fan and a driving circuit according to any one of the above embodiments, and the switch module is electrically connected to the fan.
Drawings
Fig. 1 is a circuit block diagram of a driving circuit according to an embodiment of the present disclosure.
Fig. 2 is a circuit diagram of a driving circuit according to an embodiment of the present application.
Fig. 3 is a waveform diagram of an input voltage.
Fig. 4 is a flowchart of a voltage control method according to an embodiment of the present disclosure.
Fig. 5 is a detailed flowchart of S402 in fig. 4.
Fig. 6 is a waveform diagram of the input voltage processing process performed by the switch module.
Fig. 7 is another waveform diagram of the input voltage processing process performed by the switch module.
Fig. 8 is a functional block diagram of a voltage control apparatus according to an embodiment of the present application.
An icon: 100-a drive circuit; 110-a transformer; 120-a switch module; 122-a first switch module; 124-a second switch module; 130-a controller; 200-a power supply; 300-a fan; 600-a voltage control device; 610-parameter obtaining module; 620-processing module; l1-primary coil; l2 — first secondary coil; l3 — second secondary coil; d1 — first diode; d2 — second diode; d3 — third diode; d4 — fourth diode; q1-first switch tube; d5-fifth diode; d6-sixth diode; d7-seventh diode; d8 — eighth diode; q2-second switch tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the application provides a driving circuit 100 for providing an output voltage with variable frequency and amplitude for a fan 300. Referring to fig. 1, a block diagram of a circuit structure of a driving circuit 100 according to an embodiment of the disclosure is shown. The driving circuit 100 includes a controller 130, a transformer 110, and a switch module 120. The power supply 200, the transformer 110 and the switch module 120 are electrically connected in sequence, and the controller 130 is electrically connected with the switch module 120.
The power supply 200 is a conventional single-phase network frequency voltage, and is used for providing an operating voltage for the circuit.
Referring to fig. 2, a circuit diagram of a driving circuit 100 according to an embodiment of the present disclosure is shown. The transformer 110 includes a magnetic core, a primary coil L1, a first secondary coil L2, and a second secondary coil L3, wherein the first secondary coil L2 and the second secondary coil L3 are connected in series. The primary coil L1 is electrically connected to the power supply 200, one end of the first secondary coil L2 away from the second secondary coil L3 is electrically connected to the switch module 120, and one end of the second secondary coil L3 away from the first secondary coil L2 is electrically connected to the switch module 120.
It can be seen that the power supply 200, after being applied by the transformer 110, can generate the voltage U with the same amplitude and frequency, but shifted by 180 ° from each otheraNSum voltage Ua1NWill voltage UaNSum voltage Ua1NAs input voltage in common (A waveform diagram of the input voltage as shown in fig. 3), and is input to the switching module 120.
It should be noted that, since it is necessary to generate the voltage U having the same amplitude and frequency but shifted by 180 ° from each otheraNSum voltage Ua1NThe physical properties such as inductance and quality factor of the first secondary coil L2 and the second secondary coil L3 should be completely consistent, otherwise, the voltage U would be generatedaNSum voltage Ua1NThere is a difference between them.
Referring to fig. 2, the switch module 120 includes a first switch module 122 and a second switch module 124, the first switch module 120 is electrically connected to one end of the first secondary coil L2 far from the second secondary coil L3, the second switch module 124 is electrically connected to one end of the second secondary coil L3 far from the first secondary coil L2, and the controller 130 is electrically connected to both the first switch module 120 and the second switch module 124, so that the voltages received by the first switch and the second switch are exactly 180 ° out of phase.
With reference to fig. 2, the first switch module 122 includes a first diode D1 and a second diode D2, third diode D3, fourth diode D4, and first switching tube Q1, wherein the anode of first diode D1 is electrically connected to one end of first secondary coil L2 away from second secondary coil L3, the cathode of first diode D1 is electrically connected to the cathode of second diode D2, the anode of second diode D2 is electrically connected to fan 300, the cathode of third diode D3 is electrically connected to one end of first secondary coil L2 away from second secondary coil L3, the anode of third diode D3 is electrically connected to the anode of fourth diode D4, the cathode of fourth diode D4 is electrically connected to fan 300, the gate of first switching tube Q1 is electrically connected to controller 130, the drain of first switching tube Q1 is electrically connected between first diode D1 and second diode D2, and the source of first switching tube Q1 is electrically connected between third diode D3 and fourth diode D4.
Wherein the second switch module 124 includes a fifth diode D5, a sixth diode D6, seventh diode D7, eighth diode D8, and second switching tube Q2, wherein an anode of fifth diode D5 is electrically connected to one end of second secondary coil L3 away from first secondary coil L2, a cathode of fifth diode D5 is electrically connected to a cathode of sixth diode D6, an anode of sixth diode D6 is electrically connected to fan 300, a cathode of seventh diode D7 is electrically connected to one end of second secondary coil L3 away from first secondary coil L2, an anode of seventh diode D7 is electrically connected to an anode of eighth diode D8, a cathode of eighth diode D8 is electrically connected to fan 300, a gate of second switching tube Q2 is electrically connected to controller 130, a drain of second switching tube Q2 is electrically connected between fifth diode D5 and sixth diode D6, and a source of second switching tube Q2 is electrically connected between seventh diode D7 and eighth diode D8.
The controller 130 is configured to obtain the input voltage, the target voltage, and the target period, and determine the first time and the second time by using the target voltage as an average voltage of the input voltage in one target period.
Wherein, the input voltage is the voltage U with the same amplitude and frequency but staggered by 180 degreesaNSum voltage Ua1N. The target voltage is an output voltage required by a user, and the target period may be determined according to a frequency of the fan 300 required by the user.
The first time is the time when the positive voltage in the input voltage is effective in a target period, and the second time is the time when the negative voltage in the input voltage is effective in the target period. Thus, the first time, the second time, and the target period satisfy the equation:
Ts＝tu+td
wherein, TsIs a target period, tuIs a first time, tdIs the second time.
In order to calculate the average value of the input voltage in the target period, a first voltage and a second voltage of the input voltage in each period need to be determined, wherein the first voltage is a positive voltage in the input voltage, and the second voltage is a negative voltage in the input voltage. The positive voltage is a portion of the input voltage greater than 0, and the negative voltage is a portion of the input voltage less than 0.
Thus, the first voltage satisfies the equation:
wherein v isu(t) is a first voltage, vd(t) is a second voltage, k is not less than 0, and k is an even number, VimIs the amplitude of the input voltage, w1Is the angular frequency of the input voltage.
And the target voltage is taken as the average voltage of the input voltage in a target period, so that in the target period, the input voltage can be approximately expressed as:
wherein v iso(t) is the target voltage, vu(t) is a first voltage, vdAnd (t) is a second voltage.
Thus, combining the above two equations, one can obtain:
the controller 130 is further configured to generate a driving pulse according to the first time and the second time to control the switching module 120 to output the target voltage.
It can be understood that the first time is the duration of the high level in the pulse signal, and the second time is the duration of the low level in the pulse signal, so as to generate the driving pulse signal, and thereby control the switch module 120 to be turned on or off, and the target voltage can be output.
The embodiment of the present application further provides a voltage control method, which is applied to the driving circuit 100. Fig. 4 is a flowchart of a voltage control method according to an embodiment of the present disclosure. The voltage control method comprises the following steps:
s401, acquiring an input voltage, a target voltage and a target period;
s402, using the target voltage as an average voltage of the input voltage in a target period to determine a first time and a second time.
The first time is the time when the positive voltage in the input voltage is effective, and the second time is the time when the negative voltage in the input voltage is effective.
Please refer to fig. 5, which is a flowchart illustrating the step S402. The S402 includes:
s4021, a first voltage and a second voltage are determined according to the input voltage.
The first voltage is a positive voltage in the input voltage in a target period, and the second voltage is a negative voltage in the input voltage in the target period.
The first voltage satisfies the equation:
the second voltage satisfies the equation:
wherein v isu(t) is a first voltage, vd(t) is a second voltage, k is not less than 0, k is an even number, VimIs the amplitude of the input voltage, w1Is the angular frequency of the input voltage.
S4022, determining a first time and a second time according to the obtained target voltage, the obtained target period, the first voltage and the second voltage.
The first voltage, the second voltage, the first time, the second time and the target period are used for determining the average voltage of the input voltage in one target period.
The first time, the second time and the target period satisfy the following formula:
Ts＝tu+td
wherein, TsIs a target period, tuIs a first time, tdIs the second time.
And the target voltage is taken as the average voltage of the input voltage in a target period, so that in the target period, the input voltage can be approximately expressed as:
wherein v iso(t) is a target voltage.
Thus, combining the above two equations yields:
s403, generating a driving pulse according to the first time and the second time to control the switch module 120 to output the target voltage.
Referring to fig. 6 and 7, two waveforms of the target voltage are shown respectively. It can be seen that the output voltage v in fig. 6 and 7oThe frequency and amplitude of (t) are not the same. That is, the frequency conversion and amplitude modulation of the output voltage can be realized, and the random change of the frequency of the output voltage can also be realized.
The embodiment of the present application further provides a voltage control apparatus 600, which is applied to the driving circuit 100. Referring to fig. 8, a functional block diagram of a voltage control apparatus 600 according to an embodiment of the present disclosure is shown. The voltage control apparatus 600 includes: a parameter obtaining module 610 and a processing module 620.
The parameter obtaining module 610 is configured to obtain an input voltage, a target voltage, and a target period.
It is understood that in an alternative embodiment, the parameter obtaining module 610 may be configured to execute S401.
The processing module 620 is configured to use the target voltage as an average voltage of the input voltage in a target period to determine a first time and a second time, where the first time is a time when a positive voltage in the input voltage is valid, and the second time is a time when a negative voltage in the input voltage is valid.
Specifically, the processing module 620 is configured to determine a first voltage and a second voltage according to the input voltage, where the first voltage is a positive voltage of the input voltage, and the second voltage is a negative voltage of the input voltage; the processing module 620 is further configured to determine a first time and a second time according to the obtained target voltage, the obtained target period, the first voltage, and the second voltage.
It is understood that in an alternative embodiment, the processing module 620 may be configured to execute S402, S4021 and S4022.
The processing module 620 is further configured to generate a driving pulse according to the first time and the second time to control the switching module 120 to output the target voltage.
It is understood that in an alternative embodiment, the processing module 620 may be used to execute S403.
The embodiment of the present application further provides an air conditioner, the air conditioner includes a fan 300 and the driving circuit 100 according to any of the above embodiments, and the switch module 120 is electrically connected to the fan 300.
In summary, according to the voltage control method, the voltage control device, the driving circuit, and the air conditioner provided in the embodiments of the present application, the input voltage, the target voltage, and the target period are obtained, the target voltage is used as an average voltage of the input voltage in one target period to determine the first time and the second time, and the driving pulse is generated according to the first time and the second time to control the switch module to output the target voltage. The target voltage is used as the average voltage of the input voltage in a target period, and the first time and the second time are calculated, so that the duty ratio of the control signal is determined according to the first time and the second time, the frequency conversion and amplitude modulation of the output voltage can be realized, the random change of the frequency of the output voltage can be realized, and the electric energy can be effectively saved.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A voltage control method, characterized in that the voltage control method comprises:
acquiring an input voltage, a target voltage and a target period;
taking the target voltage as an average voltage of the input voltage in one target period to determine a first time and a second time, wherein the first time is a time when a positive voltage in the input voltage is effective, and the second time is a time when a negative voltage in the input voltage is effective;
generating a driving pulse according to the first time and the second time so as to control a switch module (120) to output the target voltage;
the step of determining a first time and a second time with the target voltage as an average voltage of the input voltage over the target period comprises:
determining a first voltage and a second voltage according to the input voltage, wherein the first voltage is a positive voltage in the input voltage, and the second voltage is a negative voltage in the input voltage;
determining the first time and the second time according to the obtained target voltage, the obtained target period, the first voltage and the second voltage; the target voltage, the target period, the first voltage, the second voltage, the first time, and the second time satisfy the equation:
wherein the content of the first and second substances,
is a voltage that is a function of the target voltage,
is a voltage that is a function of the first voltage,
is a voltage that is a function of the second voltage,
in order to be said target period of time,
as the first time, the time is the first time,
is the second time.
2. The voltage control method according to claim 1, wherein the first voltage satisfies the equation:
wherein, the first and the second end of the pipe are connected with each other,
is an even number of the bits,
is the amplitude of the input voltage and,
is the angular frequency of the input voltage.
3. The voltage control method according to claim 1, wherein the second voltage satisfies the equation:
wherein the content of the first and second substances,
is an even number and is provided with a plurality of groups,
is the amplitude of the input voltage and,
is the angular frequency of the input voltage.
4. A voltage control apparatus (600), characterized in that the voltage control apparatus (600) comprises:
a parameter acquisition module (610) for acquiring an input voltage, a target voltage and a target period;
a processing module (620) configured to determine a first time and a second time by taking the target voltage as an average voltage of the input voltage in one target period, wherein the first time is a time when a positive voltage in the input voltage is valid, and the second time is a time when a negative voltage in the input voltage is valid;
the processing module (620) is further configured to generate a driving pulse according to the first time and the second time to control the switching module (120) to output the target voltage; the processing module (620) is configured to determine a first voltage and a second voltage according to the input voltage, wherein the first voltage is a positive voltage of the input voltage, and the second voltage is a negative voltage of the input voltage;
the processing module (620) is further configured to determine the first time and the second time based on the obtained target voltage, the obtained target period, the first voltage, and the second voltage; the target voltage, the target period, the first voltage, the second voltage, the first time, and the second time satisfy the equation:
wherein, the first and the second end of the pipe are connected with each other,
is a voltage that is a function of the target voltage,
in order to be able to provide said first voltage,
in order to be able to provide said second voltage,
in order to be said target period of time,
as the first time, the time is the first time,
is the second time.
5. A driver circuit (100), wherein the driver circuit (100) comprises a controller (130), a transformer (110) and a switch module (120), wherein the transformer (110) is electrically connected with the switch module (120), and the controller (130) is electrically connected with the switch module (120);
the transformer (110) is used for converting the voltage of the power supply (200) into an input voltage;
the controller (130) is configured to obtain the input voltage, a target voltage and a target period, and use the target voltage as an average voltage of the input voltage in one target period to determine a first time and a second time, wherein the first time is a time when a positive voltage in the input voltage is valid, and the second time is a time when a negative voltage in the input voltage is valid;
the controller (130) is further configured to: determining a first voltage and a second voltage according to the input voltage, wherein the first voltage is a positive voltage in the input voltage, and the second voltage is a negative voltage in the input voltage; determining the first time and the second time according to the obtained target voltage, the obtained target period, the first voltage and the second voltage; the target voltage, the target period, the first voltage, the second voltage, the first time, and the second time satisfy the equation:
wherein, the first and the second end of the pipe are connected with each other,
is a voltage that is a function of the target voltage,
in order to be able to provide said first voltage,
is a voltage that is a function of the second voltage,
in order to be the target period,
as the first time, the time is the first time,
the second time;
the controller (130) is further configured to generate a driving pulse according to the first time and the second time to control the switching module (120) to output the target voltage.
6. An air conditioner, characterized in that the air conditioner comprises a fan (300) and the driving circuit (100) of claim 5, and the switch module (120) is electrically connected with the fan (300).
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1574102A (en) * | 1967-04-21 | 1969-07-11 | ||
| JP2002084758A (en) * | 2000-06-30 | 2002-03-22 | Toyota Motor Corp | Power output device |
| US6556461B1 (en) * | 2001-11-19 | 2003-04-29 | Power Paragon, Inc. | Step switched PWM sine generator |
| CN111525787A (en) * | 2020-06-03 | 2020-08-11 | 珠海拓芯科技有限公司 | PFC control method and device, air conditioner and storage medium |
-
2021
- 2021-01-19 CN CN202110066921.8A patent/CN112671311B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1574102A (en) * | 1967-04-21 | 1969-07-11 | ||
| JP2002084758A (en) * | 2000-06-30 | 2002-03-22 | Toyota Motor Corp | Power output device |
| US6556461B1 (en) * | 2001-11-19 | 2003-04-29 | Power Paragon, Inc. | Step switched PWM sine generator |
| CN111525787A (en) * | 2020-06-03 | 2020-08-11 | 珠海拓芯科技有限公司 | PFC control method and device, air conditioner and storage medium |
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