CN112653320A - Single-phase alternating current converter bus capacitor overheating protection method and system - Google Patents
Single-phase alternating current converter bus capacitor overheating protection method and system Download PDFInfo
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- CN112653320A CN112653320A CN202011508219.4A CN202011508219A CN112653320A CN 112653320 A CN112653320 A CN 112653320A CN 202011508219 A CN202011508219 A CN 202011508219A CN 112653320 A CN112653320 A CN 112653320A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
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Abstract
The invention provides a single-phase alternating current converter bus capacitance overheating protection method and a system, wherein the method comprises the steps of collecting a temperature change value and change time of a switching tube of an alternating current converter, and calculating a first temperature change rate value of the switching tube according to the temperature change value and the change time; determining a second temperature change rate value of the bus capacitor according to the first temperature change rate value; judging whether the second temperature change rate value is larger than a first set threshold value, if so, adjusting the change rate value of the duty ratio of a driving signal of a switching tube in the alternating-current converter according to the temperature value of the switching tube and the second set threshold value; otherwise, the change rate value of the duty ratio of the driving signal of the switching tube in the alternating current converter is adjusted according to the temperature value of the switching tube and a third set threshold value. The method of the invention improves the effectiveness of capacitance protection.
Description
Technical Field
The invention relates to the technical field of bus capacitor protection, in particular to an overheating protection method and system for a bus capacitor of an alternating current converter.
Background
When the ac converter is overloaded, the power components in the ac converter generate heat seriously, and if the heat is not processed in time, the components are damaged, and even the ac converter explodes. In the prior art, energy limiting protection is performed when the current temperature is greater than a certain set value by detecting the temperature of a switching tube. However, when the controller passes through a short time and a large current, the temperature rise of the bus capacitor is far higher than the temperature of the switch tube, and if protection is carried out according to the temperature of the switch tube, the temperature of the bus capacitor can exceed the rated range of the device. The capacitance temperature is calculated according to the single variable of the temperature rise of the switching tube, and capacitance protection is performed according to the calculated capacitance temperature, so that the problem of low protection efficiency often exists.
Disclosure of Invention
The invention aims to solve the technical problem that the protection efficiency is low because the bus capacitor temperature is calculated according to the single variable of the switch tube temperature rise and the capacitor is protected according to the calculated capacitor temperature in the prior art.
In order to solve the above technical problem, an aspect of the present invention provides an overheat protection method for a bus capacitor of a single-phase ac converter, wherein one end of the bus capacitor is connected to a positive power supply terminal of the single-phase ac converter, the other end of the bus capacitor is connected to a negative power supply terminal of the single-phase ac converter, a plurality of switching tubes of the single-phase ac converter are connected in series to form at least one switching branch, and the switching branch is connected in parallel to the bus capacitor, the overheat protection method comprising:
collecting a temperature change value and change time of a switching tube of the alternating-current converter, and calculating a first temperature change rate value of the switching tube according to the temperature change value and the change time;
determining a second temperature change rate value of the bus capacitor according to the first temperature change rate value;
judging whether the second temperature change rate value is larger than a first set threshold value, if so, adjusting the change rate value of the duty ratio of a driving signal of a switching tube in the alternating-current converter according to the temperature value of the switching tube and the second set threshold value; otherwise, adjusting the change rate value of the duty ratio of the driving signal of the switching tube in the alternating-current converter according to the temperature value of the switching tube and a third set threshold value.
In a specific embodiment, the determining the second temperature change rate value of the bus capacitance according to the first temperature change rate value specifically includes:
and searching a pre-stored table according to the first temperature change rate value, and acquiring the second temperature change rate value from the table, wherein the temperature change rate value of the switching tube and the corresponding temperature change rate value of the bus capacitor are stored in the table.
In a specific embodiment, the method further comprises:
multiple tests are carried out on the multiple single-phase alternating-current converters to obtain the temperature change rate value of the switching tube and the temperature change rate value of the bus capacitor;
and processing the temperature change rate value of the switch tube and the temperature change rate value of the bus capacitor to obtain the temperature change rate value of the switch tube and the corresponding temperature change rate value of the bus capacitor.
In a specific embodiment, the adjusting a rate of change of a duty cycle of a driving signal of a switching tube in the ac converter according to a temperature value of the switching tube and a second set threshold specifically includes:
judging whether the temperature value of the switching tube is larger than a second set threshold value or not, and if so, adjusting the change rate value of the duty ratio of the pulse width modulation wave to be the second temperature change rate value; otherwise, adjusting the rate of change of the duty ratio of the pulse width modulation wave to 0, wherein the pulse width modulation wave is the driving signal of the switching tube.
In a specific embodiment, the adjusting a rate of change of a duty cycle of a driving signal of a switching tube in the ac converter according to the temperature value of the switching tube and a third set threshold specifically includes:
judging whether the temperature value of the switching tube is smaller than a third set threshold value, and adjusting the change rate value of the duty ratio of the pulse width modulation wave to be the maximum value of the duty ratio of the pulse width modulation wave; otherwise, adjusting a rate of change of the duty cycle of the pulse width modulation wave to the second temperature rate of change, wherein the pulse width modulation wave is a driving signal of the switching tube.
In a specific embodiment, the first set threshold is 0, the second set threshold is 60 degrees celsius, and the third set threshold is 45 degrees celsius.
A second aspect of the present invention provides an overheat protection system for a bus capacitor of a single-phase ac converter, wherein one end of the bus capacitor is connected to a positive power supply terminal of the single-phase ac converter, the other end of the bus capacitor is connected to a negative power supply terminal of the single-phase ac converter, a plurality of switching tubes of the single-phase ac converter are connected in series to form at least one switching leg, and the switching leg is connected in parallel to the bus capacitor, and the overheat protection system includes:
the acquisition unit is used for acquiring a temperature change value and change time of a switching tube of the alternating-current converter and calculating a first temperature change rate value of the switching tube according to the temperature change value and the change time;
the determining unit is used for determining a second temperature change rate value of the bus capacitor according to the first temperature change rate value;
the processing unit is used for judging whether the second temperature change rate value is larger than a first set threshold value or not, and if so, adjusting the change rate value of the duty ratio of a driving signal of a switching tube in the alternating-current converter according to the temperature value of the switching tube and the second set threshold value; otherwise, adjusting the change rate value of the duty ratio of the driving signal of the switching tube in the alternating-current converter according to the temperature value of the switching tube and a third set threshold value.
In a specific embodiment, the determining unit is specifically configured to:
and searching a pre-stored table according to the first temperature change rate value, and acquiring the second temperature change rate value from the table, wherein the temperature change rate value of the switching tube and the corresponding temperature change rate value of the bus capacitor are stored in the table.
In a specific embodiment, the processing unit comprises a first judging unit, a first adjusting unit and a second adjusting unit, wherein,
the first judging unit is used for judging whether the temperature value of the switch tube is larger than a second set threshold value,
the first adjusting unit is configured to adjust a rate of change of a duty ratio of a pulse width modulation wave to the second temperature rate of change when the determination result of the first determining unit is yes;
the second adjusting unit is configured to adjust a rate of change of the duty ratio of the pulse width modulation wave to 0 if the determination result of the first determining unit is negative;
the pulse width modulation wave is a driving signal of the switching tube.
In a specific embodiment, the processing unit comprises a second determining unit, a third adjusting unit and a fourth adjusting unit, wherein,
the second judging unit is used for judging whether the temperature value of the switch tube is smaller than a third set threshold value,
the third adjusting unit is configured to adjust a rate of change of the duty ratio of the pulse width modulation wave to a maximum value of the duty ratio of the pulse width modulation wave when the determination result of the second determining unit is yes;
the fourth adjusting unit is configured to adjust a rate of change of the duty ratio of the pulse-width modulation wave to the second temperature rate of change when the second determination result is negative;
the pulse width modulation wave is a driving signal of the switching tube.
The embodiment of the invention has the beneficial effects that: acquiring a switching tube temperature change value of a single-phase alternating current converter, calculating according to the temperature change value to obtain a first temperature change rate value of a switching tube, looking up a table according to the first temperature change rate value to obtain a second temperature change rate value of a bus capacitor, judging whether the second temperature change rate value is larger than a first set threshold value or not, and if so, adjusting the change rate value of the duty ratio of a pulse width modulation wave in the alternating current converter according to the temperature value of the switching tube and the second set threshold value; otherwise, the change rate value of the duty ratio of the pulse width modulation wave in the alternating current converter is adjusted according to the temperature value of the switching tube and a third set threshold value. The method determines the temperature change rate of the switch capacitor of the bus capacitor through the temperature change rate of the switch tube on the basis of the original hardware, and adjusts the change rate of the duty ratio of the drive signal of the switch tube according to the temperature change rate of the bus capacitor and the temperature change rate of the switch tube, thereby realizing the effective protection of the bus capacitor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit schematic of a prior art single phase AC converter;
fig. 2 is a schematic flow chart of a method for protecting a bus capacitor of a single-phase ac converter according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
Fig. 1 shows a circuit diagram of a single-phase ac converter, one end of a bus capacitor C is connected to a positive electrode of a power supply, the other end of the bus capacitor C is connected to a negative electrode of the power supply, gates of switching tubes Q1 to Q4 are connected to a driving signal, a source of Q1 is connected to a drain of a switching tube Q3, a source of the switching tube Q3 is connected to the negative electrode of the power supply, a drain of a switching tube Q1 is connected to the positive electrode of the power supply, a source of a switching tube Q2 is connected to a drain of the switching tube Q4, a source of the switching tube Q4 is connected to the negative electrode of the power supply, and a drain of a switching tube Q2.
Referring to fig. 2, a method for protecting a bus capacitor of a single-phase ac converter according to an embodiment of the present invention includes:
and S1, acquiring a temperature change value of a switching tube of the single-phase alternating-current converter, and calculating to obtain a first temperature change rate value of the switching tube according to the temperature change value.
Specifically, a temperature change value and change time of a switching tube of the single-phase alternating-current converter are collected, and a first temperature change rate value of the switching tube of the alternating-current converter is calculated according to the temperature change value and the change time of the switching tube.
It should be noted that, in the single-phase ac converter shown in fig. 1, there are 4 switching tubes, Q1-Q4, and since the temperature change rates of the 4 switching tubes are almost the same, the temperature change value and the change time of any one of the 4 switching tubes can be collected to obtain the first temperature change rate value.
And S2, determining a second temperature change rate value of the bus capacitance according to the first temperature change rate value.
In the single-phase ac converter, the heat generation of the bus capacitor is caused by the RMS value (effective value) of the current capacitor ripple current Idc and the bus capacitor ESR (parasitic Resistance). After the capacitance is selected, the equivalent series resistance of the bus capacitance is determined. Therefore, the heat generation of the bus capacitor is determined by the effective value of the ripple current. In the single-phase ac converter, the ripple current Idc is determined by the current and the duty ratio of the PWM wave.
Based on this, the temperature change rate of the bus capacitor can be determined by the temperature change rate of the switching tube.
Specifically, multiple tests may be performed on multiple single-phase ac converters in advance, and the temperature change of the switching tube of each single-phase ac converter within a set time and the temperature change of the corresponding bus capacitor are collected, so as to calculate and obtain the temperature change rate of the switching tube and the temperature change rate of the bus capacitor. And processing the temperature change rate of the switching tube and the temperature change rate of the bus capacitor obtained by multiple tests to obtain the corresponding relation or the corresponding numerical value of the temperature change rate of the switching tube of the single-phase alternating-current converter and the temperature change rate of the corresponding bus capacitor, and making the temperature change rate of the switching tube and the temperature change rate of the corresponding bus capacitor into a formed table and storing the formed table.
And when the first temperature change rate of the single-phase alternating current converter is obtained, searching the stored table to obtain the second temperature change rate of the bus capacitor.
S3, judging whether the second temperature change rate value is larger than a first set threshold value, if so, adjusting the change rate value of the duty ratio of the pulse width modulation wave in the alternating current converter according to the temperature value of the switching tube and the second set threshold value; otherwise, the change rate value of the duty ratio of the pulse width modulation wave in the alternating current converter is adjusted according to the temperature value of the switching tube and a third set threshold value.
Specifically, whether the second temperature change rate value is larger than a second set threshold value or not is judged, if so, whether the temperature value of the switching tube is larger than the second set threshold value or not is further judged, if so, the change rate value of the duty ratio of the pulse width modulation wave in the alternating-current converter is adjusted to be the second temperature change rate value, otherwise, the change rate value of the duty ratio of the pulse width modulation wave in the alternating-current converter is adjusted to be 0, if the second temperature change rate is smaller than the second set threshold value, whether the temperature value of the switching tube is smaller than a third set threshold value or not is judged, if so, the change rate of the duty ratio of the pulse width modulation wave in the alternating-current converter is adjusted to be the maximum value of the duty ratio of the pulse width modulation wave, and otherwise, the change rate value of the duty ratio of the pulse width modulation wave in the alternating-current converter is adjusted to be the second.
In one embodiment, the first set threshold is preferably 0, the second set threshold is preferably 60 degrees celsius, and the third set threshold is preferably 45 degrees celsius.
The method for protecting the bus capacitor of the single-phase alternating-current converter comprises the steps of acquiring a temperature change value of a switching tube of the single-phase alternating-current converter, calculating to obtain a first temperature change rate value of the switching tube according to the temperature change value, looking up a table according to the first temperature change rate value to obtain a second temperature change rate value of a bus capacitor, judging whether the second temperature change rate value is larger than a first set threshold value or not, and if so, adjusting the change rate value of the duty ratio of a pulse width modulation wave in the alternating-current converter according to the temperature value of the switching tube and the second set threshold value; otherwise, the change rate value of the duty ratio of the pulse width modulation wave in the alternating current converter is adjusted according to the temperature value of the switching tube and a third set threshold value. The method determines the temperature change rate of the switch capacitor of the bus capacitor through the temperature change rate of the switch tube on the basis of the original hardware, and adjusts the change rate of the duty ratio of the drive signal of the switch tube according to the temperature change rate of the bus capacitor and the temperature change rate of the switch tube, thereby realizing the effective protection of the bus capacitor.
Based on the first embodiment of the present invention, the second embodiment of the present invention provides an overheat protection system for a bus capacitor of a single-phase ac converter, including: the device comprises an acquisition unit, a determination unit and a processing unit, wherein the acquisition unit is used for acquiring a first temperature change rate value of a switching tube of the alternating-current converter; the determining unit is used for determining a second temperature change rate value of the bus capacitor according to the first temperature change rate value; the processing unit is used for judging whether the second temperature change rate value is larger than a first set threshold value or not, and if so, adjusting the change rate value of the duty ratio of the pulse width modulation wave in the alternating-current converter according to the temperature value of the switching tube and the second set threshold value; otherwise, the change rate value of the duty ratio of the pulse width modulation wave in the alternating current converter is adjusted according to the temperature value of the switching tube and a third set threshold value.
In a specific embodiment, the determining unit is specifically configured to search a table stored in advance according to the first temperature change rate value, and obtain the second temperature change rate value from the table, where the table stores the temperature change rate value of the switching tube and the corresponding temperature change rate value of the bus capacitor.
In a specific embodiment, the processing unit includes a first determining unit, a first adjusting unit and a second adjusting unit, wherein the first determining unit is configured to determine whether a temperature value of the switching tube is greater than a second set threshold, and the first adjusting unit is configured to adjust a rate of change of the duty ratio of the pulse width modulation wave to the second temperature rate of change when a determination result of the first determining unit is yes; the second adjusting unit is configured to adjust a rate of change of the duty ratio of the pulse width modulation wave to 0 when the determination result of the first determining unit is negative.
In a specific embodiment, the processing unit includes a second determining unit, a third adjusting unit and a fourth adjusting unit, wherein the second determining unit is configured to determine whether the temperature value of the switching tube is smaller than a third set threshold, and the third adjusting unit is configured to adjust a rate of change of the duty cycle of the pulse-width modulation wave to a maximum value of the duty cycle of the pulse-width modulation wave when a determination result of the second determining unit is yes; the fourth adjusting unit is configured to adjust a rate of change of the duty ratio of the pulse-width modulation wave to the second temperature rate of change when the second determination result is negative.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A method for protecting a bus capacitor of a single-phase ac converter from overheating, wherein one end of the bus capacitor is connected to a positive power supply terminal of the single-phase ac converter, the other end of the bus capacitor is connected to a negative power supply terminal of the single-phase ac converter, a plurality of switching tubes of the ac converter are connected in series to form at least one switching branch, and the switching branch is connected in parallel with the bus capacitor, the method comprising the steps of:
collecting a temperature change value and change time of a switching tube of the alternating-current converter, and calculating a first temperature change rate value of the switching tube according to the temperature change value and the change time;
determining a second temperature change rate value of the bus capacitor according to the first temperature change rate value;
judging whether the second temperature change rate value is larger than a first set threshold value, if so, adjusting the change rate value of the duty ratio of a driving signal of a switching tube in the alternating-current converter according to the temperature value of the switching tube and the second set threshold value; otherwise, adjusting the change rate value of the duty ratio of the driving signal of the switching tube in the alternating-current converter according to the temperature value of the switching tube and a third set threshold value.
2. The method of claim 1, wherein determining a second temperature rate of change value of the bus capacitance from the first temperature rate of change value comprises:
and searching a pre-stored table according to the first temperature change rate value, and acquiring the second temperature change rate value from the table, wherein the temperature change rate value of the switching tube and the corresponding temperature change rate value of the bus capacitor are stored in the table.
3. The method of claim 2, further comprising:
multiple tests are carried out on the multiple single-phase alternating-current converters to obtain the temperature change rate value of the switching tube and the temperature change rate value of the bus capacitor;
and processing the temperature change rate value of the switch tube and the temperature change rate value of the bus capacitor to obtain the temperature change rate value of the switch tube and the corresponding temperature change rate value of the bus capacitor.
4. The method according to claim 1, wherein the adjusting the rate of change of the duty cycle of the driving signal of the switching tube in the ac converter according to the temperature value of the switching tube and the second set threshold specifically comprises:
judging whether the temperature value of the switching tube is larger than a second set threshold value or not, and if so, adjusting the change rate value of the duty ratio of the pulse width modulation wave to be the second temperature change rate value; otherwise, adjusting the rate of change of the duty ratio of the pulse width modulation wave to 0, wherein the pulse width modulation wave is the driving signal of the switching tube.
5. The method according to claim 1, wherein the adjusting the rate of change of the duty cycle of the driving signal of the switching tube in the ac converter according to the temperature value of the switching tube and a third set threshold specifically comprises:
judging whether the temperature value of the switching tube is smaller than a third set threshold value, and adjusting the change rate value of the duty ratio of the pulse width modulation wave to be the maximum value of the duty ratio of the pulse width modulation wave; otherwise, adjusting a rate of change of the duty cycle of the pulse width modulation wave to the second temperature rate of change, wherein the pulse width modulation wave is a driving signal of the switching tube.
6. The method of claim 1, wherein:
the first set threshold is 0, the second set threshold is 60 degrees centigrade, and the third set threshold is 45 degrees centigrade.
7. A single-phase AC converter bus capacitance overheat protection system, comprising:
the acquisition unit is used for acquiring a temperature change value and change time of a switching tube of the alternating-current converter and calculating a first temperature change rate value of the switching tube according to the temperature change value and the change time;
the determining unit is used for determining a second temperature change rate value of the bus capacitor according to the first temperature change rate value;
the processing unit is used for judging whether the second temperature change rate value is larger than a first set threshold value or not, and if so, adjusting the change rate value of the duty ratio of a driving signal of a switching tube in the alternating-current converter according to the temperature value of the switching tube and the second set threshold value; otherwise, adjusting the change rate value of the duty ratio of the driving signal of the switching tube in the alternating-current converter according to the temperature value of the switching tube and a third set threshold value.
8. The system according to claim 7, wherein one end of the bus capacitor is connected to a positive power supply terminal of the single-phase ac converter, the other end of the bus capacitor is connected to a negative power supply terminal of the single-phase ac converter, and a plurality of switching tubes of the ac converter are connected in series to form at least one switching branch, and the switching branch is connected in parallel to the bus capacitor, wherein the determining unit is specifically configured to:
and searching a pre-stored table according to the first temperature change rate value, and acquiring the second temperature change rate value from the table, wherein the temperature change rate value of the switching tube and the corresponding temperature change rate value of the bus capacitor are stored in the table.
9. The system of claim 8, wherein the processing unit comprises a first determining unit, a first adjusting unit, and a second adjusting unit, wherein,
the first judging unit is used for judging whether the temperature value of the switch tube is larger than a second set threshold value,
the first adjusting unit is configured to adjust a rate of change of a duty ratio of a pulse width modulation wave to the second temperature rate of change when the determination result of the first determining unit is yes;
the second adjusting unit is configured to adjust a rate of change of the duty ratio of the pulse width modulation wave to 0 if the determination result of the first determining unit is negative;
the pulse width modulation wave is a driving signal of the switching tube.
10. The system according to claim 8, characterized in that the processing unit comprises a second determination unit, a third adjustment unit and a fourth adjustment unit, wherein,
the second judging unit is used for judging whether the temperature value of the switch tube is smaller than a third set threshold value,
the third adjusting unit is configured to adjust a rate of change of the duty ratio of the pulse width modulation wave to a maximum value of the duty ratio of the pulse width modulation wave when the determination result of the second determining unit is yes;
the fourth adjusting unit is configured to adjust a rate of change of the duty ratio of the pulse-width modulation wave to the second temperature rate of change when the second determination result is negative;
the pulse width modulation wave is a driving signal of the switching tube.
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| CN202011508219.4A CN112653320B (en) | 2020-12-18 | 2020-12-18 | Single-phase alternating current converter bus capacitor overheating protection method and system |
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| CN202011508219.4A CN112653320B (en) | 2020-12-18 | 2020-12-18 | Single-phase alternating current converter bus capacitor overheating protection method and system |
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| JP2008131722A (en) * | 2006-11-20 | 2008-06-05 | Nippon Reliance Kk | Power element overheating protection device |
| CN101399493A (en) * | 2007-09-27 | 2009-04-01 | 艾默生网络能源系统有限公司 | AC/DC rectifier |
| CN104965536A (en) * | 2015-06-24 | 2015-10-07 | 上海沪工焊接集团股份有限公司 | Temperature control circuit and temperature control method |
| CN105659460A (en) * | 2013-10-22 | 2016-06-08 | 今井满 | Power supply apparatus |
| CN107070364A (en) * | 2017-03-31 | 2017-08-18 | 广东美的制冷设备有限公司 | Air conditioner, motor driver and its anti-cross heat control method and device |
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2020
- 2020-12-18 CN CN202011508219.4A patent/CN112653320B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008131722A (en) * | 2006-11-20 | 2008-06-05 | Nippon Reliance Kk | Power element overheating protection device |
| CN101399493A (en) * | 2007-09-27 | 2009-04-01 | 艾默生网络能源系统有限公司 | AC/DC rectifier |
| CN105659460A (en) * | 2013-10-22 | 2016-06-08 | 今井满 | Power supply apparatus |
| CN104965536A (en) * | 2015-06-24 | 2015-10-07 | 上海沪工焊接集团股份有限公司 | Temperature control circuit and temperature control method |
| CN107070364A (en) * | 2017-03-31 | 2017-08-18 | 广东美的制冷设备有限公司 | Air conditioner, motor driver and its anti-cross heat control method and device |
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Address after: 450016 No.99, Jingbei 6th Road, Zhengzhou area (Jingkai), Zhengzhou pilot Free Trade Zone, Henan Province Applicant after: Henan Jiachen Intelligent Control Co.,Ltd. Address before: 450016 No.99, Jingbei 6th Road, Zhengzhou area (Jingkai), Zhengzhou pilot Free Trade Zone, Henan Province Applicant before: ZHENGZHOU JIACHEN ELECTRIC Co.,Ltd. |
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