CN111817557A - Control circuit and control method of switch type converter - Google Patents
Control circuit and control method of switch type converter Download PDFInfo
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- CN111817557A CN111817557A CN202010675401.2A CN202010675401A CN111817557A CN 111817557 A CN111817557 A CN 111817557A CN 202010675401 A CN202010675401 A CN 202010675401A CN 111817557 A CN111817557 A CN 111817557A
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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Abstract
The invention discloses a control circuit and a control method of a switch type converter.A frequency regulating circuit outputs a maximum frequency signal to control the maximum working frequency of a main switching tube, and the frequency regulating circuit switches and outputs a plurality of maximum frequency signals with different sizes according to the switching period of the main switching tube. According to the scheme of the invention, the maximum working frequency of the main switching tube is adjusted in each switching period, so that the output signal corresponding to a half-wave input voltage signal can be uniformly regulated, and the output signal of the converter is maintained to be basically constant in the whole working period. The scheme of the invention can avoid the problem of lamp flicker caused by unstable output current in the application of lighting load occasions.
Description
Technical Field
The present invention relates to the field of power electronics, and more particularly, to a control circuit and a control method for a switching converter.
Background
An existing ac-dc switch-type converter receives a sinusoidal input voltage signal, outputs a stable dc voltage signal after being processed by a rectifying circuit and a power stage circuit, and supplies the stable dc voltage signal to a load, for example, fig. 1 shows a commonly used switch-type converter, where the power stage circuit takes a buck topology as an example, and a control circuit controls a switching state of a power switch Q in the power stage circuit. In the situation of high requirement for power factor of the switch-type converter, the capacitance value of the input capacitor Cin is usually set to be relatively small to meet the requirement for power factor, the input sinusoidal voltage signal is processed by the rectifier circuit to be a half-wave voltage signal, the working frequency of the power switch tube in the power stage circuit is correspondingly changed due to the change trend of the half-wave voltage signal, and the working frequency of the power switch tube is close to the trough period at two sides of the half-wave voltage signalThe rate will be increased, but due to the characteristics of the switch tube and the requirement of the system for the working efficiency, when the half-wave voltage signal is in the period of two sides close to the wave trough, the control circuit generates the maximum working frequency fmaxTo limit the operating frequency of the power switching tube.
However, when the switch-mode converter is used in a lighting application, the output dimming current is small, which reduces the peak value of the inductor current, thus setting the maximum operating frequency fmaxThe frequency point of the power switch tube is easy to appear on the peak point of the inductive current or near the peak value of the inductive current, so that the conduction time of the power switch tube is easy to be unstable, the output signal is unstable, and the lighting load flickers.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a control circuit and a control method for a switching regulator, so as to solve the technical problems of unstable output signal and flickering of lighting load in the prior art.
The technical solution of the present invention is to provide a control circuit of a switch-type converter, the switch-type converter includes a power stage circuit, wherein the power stage circuit includes a main switching tube, the control circuit includes a frequency adjusting circuit, outputs a maximum frequency signal to control a maximum operating frequency of the main switching tube, and the frequency adjusting circuit adjusts a magnitude of the maximum operating frequency according to a switching period of the main switching tube;
and the control and drive circuit receives the maximum frequency signal output by the frequency regulating circuit so as to adjust the maximum working frequency of the main switching tube in each switching period.
Further, the frequency adjusting circuit switches and outputs a plurality of maximum frequency signals with different sizes according to the switching period of the main switching tube.
Further, the control and drive circuit outputs a switch control signal to control the switch state of the main switch tube; and the frequency adjusting circuit receives the switch control signal and obtains the switching period of the main switching tube according to the switch control signal so as to switch the maximum frequency signal.
Further, the maximum frequency signals with different sizes are alternately switched and output according to the switching period of the main switching tube.
Further, the control circuit comprises a zero-crossing detection circuit, and the zero-crossing detection circuit detects whether the current of the inductor in the power stage circuit crosses zero;
and the frequency adjusting circuit determines whether the maximum frequency signal is switched in the next switching period according to the maximum working frequency of the main switching tube in the current switching period and the time sequence of the zero crossing of the inductive current.
Further, the frequency adjustment circuit includes a signal comparison circuit, the plurality of different maximum frequency signals includes a first maximum frequency signal and a second maximum frequency signal, the first maximum operating frequency is greater than the second maximum operating frequency,
if the main switching tube works at the first maximum working frequency in the current switching period, the signal comparison circuit detects that the inductive current reaches the zero reference current and appears before the first maximum working frequency of the main switching tube, the frequency adjusting circuit outputs the second maximum frequency signal in the next switching period of the main switching tube, and otherwise, the frequency adjusting circuit keeps outputting the first maximum frequency signal in the next switching period of the main switching tube;
if the frequency adjusting circuit is switched to output the second maximum frequency signal, in the current switching period, the signal comparison circuit detects that the inductive current reaches the second maximum working frequency of the main switching tube when the zero reference current appears, in the next switching period, the frequency adjusting circuit outputs the first maximum frequency signal, otherwise, in the next switching period, the frequency adjusting circuit keeps outputting the second maximum frequency signal.
Further, the frequency adjusting circuit includes a frequency signal generating circuit for generating the maximum frequency signals different in magnitude,
the frequency signal generating circuit comprises a current source, a charging capacitor and a comparator, wherein the current source charges the charging capacitor to generate a charging voltage signal, the comparator receives the charging voltage signal and a reference voltage signal to generate a comparison signal, the comparison signal is used as the maximum frequency signal,
wherein adjusting the magnitude of the current source or adjusting the magnitude of the reference voltage signal or adjusting the magnitude of the charging capacitor to generate maximum frequency signals of different magnitudes.
In a second aspect, a method for controlling a switching regulator, the switching regulator including a power stage circuit, wherein the power stage circuit includes a main switching tube, includes,
controlling the maximum working frequency of the main switching tube according to a maximum frequency signal, and adjusting the maximum working frequency according to the switching period of the main switching tube;
and receiving the maximum frequency signal so as to adjust the maximum working frequency of the main switching tube in each switching period.
Further, the frequency adjusting circuit switches and outputs a plurality of maximum frequency signals with different sizes according to the switching period of the main switching tube.
Further, outputting a switch control signal to control the switch state of the main switch tube;
and receiving the switch control signal to obtain a switching period according to the switch control signal so as to switch the maximum frequency signal.
Further, the maximum frequency signals with different sizes are alternately switched according to the switching period of the main switching tube.
Further, the moment when the current of the inductor in the main switch tube reaches zero reference current is detected,
and determining whether the maximum frequency signal is switched in the next switching period according to the maximum working frequency of the main switching tube in the current switching period and the time sequence of the zero crossing of the inductive current.
By adopting the control circuit structure, the maximum working frequency of the main switching tube is adjusted in each switching period, so that the output signal in a half-wave input voltage signal can be uniformly adjusted without being influenced by the change of the input signal, the output signal of the converter is ensured to be basically constant in the whole working process, and in the application of lighting load occasions, the output current is stable in the power frequency working period, and the load does not flicker.
Drawings
Fig. 1 is a circuit block diagram of a conventional switch-type converter;
FIG. 2 is a block diagram of a control circuit of a switching converter according to a first embodiment of the present invention;
FIG. 3 is a block diagram of a control circuit of a switching converter according to a second embodiment of the present invention;
FIG. 4 is a flow chart of a control method of the switching converter of the present invention;
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in simplified form and are not to precise scale, which is only used for convenience and clarity to assist in describing the embodiments of the present invention.
As shown in fig. 2, a circuit block diagram of a first embodiment of a control circuit of a switching converter according to the present invention is shown, where the switching converter includes a rectifying circuit, a power stage circuit and a control circuit, the power stage circuit adopts a step-down conversion topology as an example, and the topology includes an input capacitor Cin, an output capacitor Co, a main switching tube Q, an inductor L connected to the main switching tube Q, and a rectifying diode D. The switch type converter receives an alternating current input signal Vin, converts the alternating current input signal Vin into a half-wave input signal Vin ' after rectification by the rectification circuit, the power stage circuit receives the half-wave input signal Vin ', the half-wave input signal Vin ' is converted into a direct current output signal to be supplied to a load through control of the control circuit on the switching state of the main switching tube Q, and voltage at two ends of the output capacitor Co is recorded as an output voltage signal Vo.
Those skilled in the art will appreciate that the power stage circuit shown in fig. 2 is a buck topology for example, and in other embodiments, the power stage circuit may employ any suitable dc-dc topology, such as synchronous buck, boost, synchronous boost, flyback, synchronous flyback, and other suitable topologies. The signal at the output may also be other types of output signals, such as an output current signal, etc. The half-wave signal input in this embodiment mode is a sinusoidal half-wave signal, and may be other types such as a quasi-half-wave signal.
For the application of lighting load dimming, the switch-type converter needs to maintain the output signal to be basically stable in the working time, but due to the change characteristics of the input signal, the output signals corresponding to adjacent half-wave input signals generate great difference, so that the output signals generate instability, and the lighting load is easy to flicker.
In the embodiment of the invention, the control circuit comprises a frequency adjusting circuit 1 and a control and drive circuit 2, and the frequency adjusting circuit 1 outputs a maximum frequency signal VfmaxThe frequency adjusting circuit 1 switches and outputs a plurality of maximum frequency signals with different sizes according to the switching period of the main switching tube, and the control and driving circuit 2 receives the maximum frequency signals output by the frequency adjusting circuit, so as to adjust the maximum working frequency of the main switching tube Q in each switching period.
Specifically, in this embodiment, the frequency adjustment circuit includes a frequency signal generation circuit 1-1 for generating the maximum frequency signals with different magnitudes, the frequency signal generation circuit includes a current source I, a charging capacitor C1 and a comparator cmp, the current source charges the charging capacitor to generate a charging voltage signal Vc1, the comparator cmp receives the charging voltage signal Vc1 and a reference voltage signal Vref to generate a comparison signal as the maximum frequency signal, wherein the magnitude of the current source is adjusted or the magnitude of the reference voltage signal is adjusted or the magnitude of the charging capacitor is adjusted to generate the maximum frequency signals with different magnitudes. Here, according to the operating principle of the switch-type converter, when the comparison signal jumps to an active state (e.g., a high state), the frequency-limited state of the main switching tube is ended.
Here, the control and drive circuit 2 outputs a switching control signal VQControlling the on-off state of the main switch tube, and receiving the switch control signal V by the frequency regulating circuitQAnd obtaining the switching period of the main switching tube according to the switching control signal so as to switch the maximum frequency signal. According to a switch control signal VQControl of the on-off state of the main switching tube, switch control signal VQCorresponding to the switching period of the main switching tube, e.g. when the switching control signal VQWhen the switch is in an effective state, the main switch tube is conducted, and the switch control signal V isQWhen the switch is in an invalid state, the main switch tube is turned off, and then the switch control signal V is knownQThe change from one active state to the next active state corresponds to one switching period T of the main switching tube. Therefore, the switching period T information of the main switching tube is obtained according to the switching control signal, and then the switching of the maximum frequency signal is carried out according to the switching period signal.
In this embodiment, the maximum frequency signals with different magnitudes are generated by adjusting the magnitude of the current source, or adjusting the magnitude of the reference voltage signal, or adjusting the magnitude of the charging capacitor, and then the maximum frequency signals with different magnitudes are switched and output according to a switching period.
Specifically, in this embodiment, the maximum frequency signals with different magnitudes are alternately switched and output according to the switching period of the main switching tube. Take the two maximum frequency signals as an example, and mark Vfmax1、Vfmax2The maximum frequency signal output in the last switching period is Vfmax1Limiting the maximum working frequency of the main switching tube to fmax1, and outputting a maximum frequency signal V in the next switching periodfmax2The maximum working frequency of the main switching tube is limited to fmax2, and the maximum working frequency is alternated, so that the maximum working frequency of the main switching tube is dynamically changed in a half-wave input signal time period, the output signal is kept basically constant in all half-wave input signal time periods, and in the application of lighting load occasions, the output current signal is stable, the ripple wave is small, and no flicker exists.
As can be known to those skilled in the art, the maximum frequency signals with different magnitudes may include more than two, such as three, four, etc., the maximum frequency signals with different magnitudes may be sequentially increased, sequentially decreased, or set to different values as needed, and during the operation of the converter, the maximum frequency signals with different magnitudes are sequentially and alternately switched according to the switching period, so that a better control effect may be achieved, the output current may be more uniform, and the dimming effect is more stable.
Referring to fig. 3, a control circuit according to a second embodiment of the present invention is shown, in this embodiment, a frequency signal generating circuit is the same as that in the previous embodiment, and is not repeated, except that the control circuit includes a zero-crossing detecting circuit 3, and the zero-crossing detecting circuit 3 detects whether a current of an inductor L in the power stage circuit crosses zero. The frequency regulating circuit comprises a signal comparison circuit 1-2, and the signal comparison circuit 1-2 compares the inductive current ISThe time sequence of the time when the zero reference current V0 is reached and the maximum working frequency of the main switching tube is obtained, even if the inductive current I is comparedSThe moment of reaching the zero reference current V0 is before or after the maximum working frequency of the main switching tube, so that the switching output of the maximum frequency signal is carried out according to the comparison result. The following areTwo different maximum frequency signals Vfmax1、Vfmax2For illustration, correspondingly, the first maximum frequency signal Vfmax1Controlling the main switch tube to work at a first maximum working frequency fmax1 and a second maximum frequency signal Vfmax2Controlling the main switching tube to work at a second maximum working frequency fmax2, wherein the first maximum working frequency fmax1 is greater than the second maximum working frequency fmax2,
in the current switching period of the main switching tube, the frequency regulating circuit outputs the first maximum frequency signal Vfmax1When the signal comparison circuit 1-2 detects that the inductive current reaches the zero reference current before the zero reference current appears at the first maximum working frequency of the main switching tube, and the inductive current reaches the zero reference current, the frequency adjustment circuit outputs the second maximum frequency signal V in the next switching period of the main switching tubefmax2Otherwise, the first maximum frequency signal V is kept to be output in the next switching period of the main switching tubefmax1。
Then, if the frequency adjusting circuit is switched to output the second maximum frequency signal Vfmax2If, in the present switching cycle, the signal comparison circuit 1-2 detects that the time at which the inductor current reaches the zero reference current is after the second maximum operating frequency of the main switching tube, then in the next switching cycle, the frequency adjustment circuit outputs the first maximum frequency signal Vfmax1Otherwise, in the next switching period, the second maximum frequency signal V is kept to be outputfmax2And the process is repeated in this way.
In this embodiment, the switching output of the maximum frequency signal is performed according to the sequence of the maximum operating frequency of the main switching tube when the inductive current reaches the zero reference current, the switching of the maximum frequency signal can be performed according to the actual circuit condition, the stability of the output signal can be better controlled, the main switching tube can be conducted at zero voltage when the inductive current reaches the zero reference current in the next switching period, and the output signal can be kept substantially constant without large change in the time period of the input signal of all half-waves.
It will be appreciated by those skilled in the art that the plurality of maximum frequency signals may also be three, four or more, and the plurality of maximum frequency signals may be sequentially switched according to the derivation process described above, so that the output signal may be better adjusted. In addition, in the above embodiment, the first maximum operating frequency corresponding to the first maximum operating frequency fmax1 is greater than the second maximum operating frequency corresponding to the second maximum operating frequency fmax2, in other embodiments, the first maximum operating frequency fmax1 may be smaller than the second maximum operating frequency fmax2, and the switching sequence may also be switched according to the sequence between the zero-crossing time of the inductor current and the arrival time of the maximum operating frequency, which is not illustrated herein.
The control circuit of the switch-type converter is suitable for a switch power supply in a critical conduction mode, and can enable an output signal in a half-wave input voltage signal to be uniformly regulated by actively adjusting the maximum working frequency of the main switching tube without being influenced by the size change of the input signal, thereby ensuring that the output signal of the converter is kept basically constant in the whole working process.
In a second aspect, referring to fig. 4, the present invention discloses a control method of a switch-type converter, the switch-type converter comprising a power stage circuit, wherein the power stage circuit comprises a main switching tube, comprising the steps of;
s1: controlling the maximum working frequency of the main switching tube according to a maximum frequency signal, and adjusting the maximum working frequency according to the switching period of the main switching tube;
s2: and receiving the maximum frequency signal so as to adjust the maximum working frequency of the main switching tube in each switching period.
Further, the frequency adjusting circuit switches and outputs a plurality of maximum frequency signals with different sizes according to the switching period of the main switching tube.
Further, outputting a switch control signal to control the switch state of the main switch tube;
and receiving the switch control signal to obtain a switching period according to the switch control signal so as to switch the maximum frequency signal.
Further, the maximum frequency signals with different sizes are alternately switched according to the switching period of the main switching tube.
Further, the time sequence of the time when the current of the inductor in the main switching tube reaches the zero point is detected to appear at the maximum working frequency of the main switching tube, so that the maximum frequency signal is switched and output according to the comparison result.
From the above description of the switch-mode converter circuit and the structure, a person skilled in the art may deduce that other techniques or structures are equally applicable to the above embodiments. In addition, the converter in the present embodiment includes a buck-synchronous buck structure, but other converters such as a boost converter, a synchronous boost converter, a flyback converter, a synchronous flyback converter and other suitable topologies are all applicable to the embodiments of the present invention.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (12)
1. A control circuit of a switch type converter, the switch type converter comprises a power stage circuit, wherein the power stage circuit comprises a main switch tube, and the control circuit is characterized by comprising
The frequency adjusting circuit outputs a maximum frequency signal to control the maximum working frequency of the main switching tube, and the frequency adjusting circuit adjusts the maximum working frequency according to the switching period of the main switching tube;
and the control and drive circuit receives the maximum frequency signal output by the frequency regulating circuit so as to adjust the maximum working frequency of the main switching tube in each switching period.
2. The control circuit of claim 1, wherein the frequency adjustment circuit switches and outputs a plurality of maximum frequency signals with different magnitudes according to the switching period of the main switching tube.
3. The control circuit of claim 2, wherein the control and drive circuit outputs a switch control signal to control the switching state of the main switching tube;
and the frequency adjusting circuit receives the switch control signal and obtains the switching period of the main switching tube according to the switch control signal so as to switch the maximum frequency signal.
4. The control circuit of claim 3, wherein the plurality of maximum frequency signals of different magnitudes are alternately switched to be output according to a switching period of the main switching tube.
5. The control circuit of claim 3, wherein the control circuit includes a zero crossing detection circuit that detects whether a current of an inductor in the power stage circuit crosses zero;
and the frequency adjusting circuit determines whether the maximum frequency signal is switched in the next switching period according to the maximum working frequency of the main switching tube in the current switching period and the time sequence of the zero crossing of the inductive current.
6. The control circuit of claim 5, wherein the frequency adjustment circuit comprises a signal comparison circuit, wherein the plurality of different maximum frequency signals comprises a first maximum frequency signal and a second maximum frequency signal, wherein the first maximum operating frequency is greater than the second maximum operating frequency,
if the main switching tube works at the first maximum working frequency in the current switching period, the signal comparison circuit detects that the inductive current reaches the zero reference current and appears before the first maximum working frequency of the main switching tube, the frequency adjusting circuit outputs the second maximum frequency signal in the next switching period of the main switching tube, and otherwise, the frequency adjusting circuit keeps outputting the first maximum frequency signal in the next switching period of the main switching tube;
if the frequency adjusting circuit is switched to output the second maximum frequency signal, in the current switching period, the signal comparison circuit detects that the inductive current reaches the second maximum working frequency of the main switching tube when the zero reference current appears, in the next switching period, the frequency adjusting circuit outputs the first maximum frequency signal, otherwise, in the next switching period, the frequency adjusting circuit keeps outputting the second maximum frequency signal.
7. The control circuit according to any one of claims 1 to 6, wherein the frequency adjustment circuit includes a frequency signal generation circuit for generating the maximum frequency signals different in magnitude,
the frequency signal generating circuit comprises a current source, a charging capacitor and a comparator, wherein the current source charges the charging capacitor to generate a charging voltage signal, the comparator receives the charging voltage signal and a reference voltage signal to generate a comparison signal, the comparison signal is used as the maximum frequency signal,
wherein adjusting the magnitude of the current source or adjusting the magnitude of the reference voltage signal or adjusting the magnitude of the charging capacitor to generate maximum frequency signals of different magnitudes.
8. A control method of a switch-type regulator, the switch-type converter comprises a power stage circuit, wherein the power stage circuit comprises a main switch tube, the method comprises the following steps,
controlling the maximum working frequency of the main switching tube according to a maximum frequency signal, and adjusting the maximum working frequency according to the switching period of the main switching tube;
and receiving the maximum frequency signal so as to adjust the maximum working frequency of the main switching tube in each switching period.
9. The control method of claim 8, wherein the frequency adjusting circuit switches and outputs a plurality of maximum frequency signals with different magnitudes according to the switching period of the main switching tube.
10. The control method according to claim 9,
outputting a switch control signal to control the on-off state of the main switching tube;
and receiving the switch control signal to obtain a switching period according to the switch control signal so as to switch the maximum frequency signal.
11. The control method of claim 10, wherein the plurality of maximum frequency signals of different magnitudes are alternately switched according to a switching period of the main switching tube.
12. The control method according to claim 10,
detecting the moment when the current of the inductor in the main switching tube reaches zero reference current,
and determining whether the maximum frequency signal is switched in the next switching period according to the maximum working frequency of the main switching tube in the current switching period and the time sequence of the zero crossing of the inductive current.
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |
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Application publication date: 20201023 |