CN112290810A - Circuit for realizing power saving of power supply and power supply method - Google Patents
Circuit for realizing power saving of power supply and power supply method Download PDFInfo
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- CN112290810A CN112290810A CN202011116954.0A CN202011116954A CN112290810A CN 112290810 A CN112290810 A CN 112290810A CN 202011116954 A CN202011116954 A CN 202011116954A CN 112290810 A CN112290810 A CN 112290810A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims abstract description 24
- 230000002159 abnormal effect Effects 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 229920002492 poly(sulfone) Polymers 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000009993 protective function Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/3296—Power saving characterised by the action undertaken by lowering the supply or operating voltage
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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
- H02H7/10—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 converters; for rectifiers
- H02H7/12—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 converters; for rectifiers for static converters or rectifiers
- H02H7/125—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 converters; for rectifiers for static converters or rectifiers for rectifiers
-
- 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
- H02H7/10—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 converters; for rectifiers
- H02H7/12—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 converters; for rectifiers for static converters or rectifiers
- H02H7/125—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 converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1255—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 converters; for rectifiers for static converters or rectifiers for rectifiers responsive to internal faults, e.g. by monitoring ripple in output voltage
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a circuit for realizing power saving of a power supply and a power supply method, wherein an equipment sensor circuit is used to further achieve the purpose of detecting the voltage of a sensor in real time, and the voltage is simultaneously reflected to a switch circuit to control the method for switching an AC input power; when the load is light, the device sensor circuit informs the buck converter to achieve the effect of frequency reduction, so that the buck converter effectively reduces the switching power consumption; when the rectifier is damaged to cause the capacitor voltage to be abnormal, the switching circuit is informed to be closed through the equipment sensor circuit, and the damage of the buck converter caused by the abnormal capacitor voltage is avoided.
Description
Technical Field
The invention relates to a circuit for realizing power saving of a power supply and a power supply method, belonging to the technical field of server power systems.
Background
In a typical server, many power-saving design methods are provided, such as: the low voltage processor and the memory are selected to share the heat sink module, and it is one of the design objectives for the power engineer to maintain the circuit high power saving and minimize the power loss.
Because the input source AC PSU of all current server products has output at the output end of the AC PSU when the AC power is inserted, the power loss generated by the full-bridge PWM rectifier and the buck converter is still caused when no output device is available.
The loss of the input source PSU power of a server product can reduce the overall efficiency of the system, meanwhile, the buck converter is protected and the efficiency is improved, and the problem of reducing the overall power loss of the server product system is urgently needed to be solved.
Disclosure of Invention
In view of the above technical problems, the present invention aims to: a circuit and a power supply method for saving power of a power supply are provided to reduce power consumption of a power system and improve the functionality of a PSU and the protection of a system power.
The technical solution of the invention is realized as follows: a circuit for realizing power saving of a power supply comprises an AC input power supply, a rectifier, a buck converter, a capacitor and a load; the rectifier comprises a first diode, a second diode, a third diode and a fourth diode; also included is a device sensor circuit; the equipment sensor circuit comprises a switching circuit, an equipment sensor and a sensing resistor; the output end of the AC input power supply is connected with the switch circuit and is connected with the cathode of the first diode and the anode of the second diode; the cathode of the second diode and the cathode of the fourth diode of the rectifier are connected with the buck converter in series; the buck converter and the sensing resistor are connected in series with the anode of the output device; the negative electrode of the load is connected with the anode of the first diode and the anode of the third diode in series; the equipment sensor is connected with the sensing resistor and the buck converter in parallel and connected with the switching circuit in series; and capacitors are connected in parallel between the rectifier and the buck converter and between the buck converter and the sensing resistor.
Preferably, the first diode, the second diode, the third diode and the fourth diode in the rectifier are replaced by MOSFETs.
Preferably, the AC input power is any one of 12V, 48V, and 54V.
A power supply method of circuit for realizing power saving of power supply comprises the following steps,
s100, detecting voltage difference at two sides of a sensing resistor by an equipment sensor circuit, and calculating load current by using the voltage difference; simultaneously, the equipment sensor circuit detects the capacitor voltage;
and S200, judging the load condition according to the magnitude of the load current, and performing circuit control according to the load condition and the capacitor voltage.
Preferably, the load condition is judged according to the magnitude of the load current, and the circuit control is carried out according to the load condition and the capacitor voltage, including
When the equipment is not loaded, the equipment sensor circuit controls the switch circuit to be closed;
when the equipment has a load, the equipment sensor circuit controls the buck converter to change the switching frequency according to the magnitude of the load current: the smaller the load current, the switching frequency FswThe lower the switching power consumption P of the buck convertersw_lossThe lower the overall efficiency η is, the higher it is;
when the rectifier is damaged to cause the capacitor voltage to be abnormal, the equipment sensor circuit controls the switch circuit to be closed.
Preferably, the switching power consumption Psw_lossThe calculation formula of (2) is as follows:
wherein, VinIs the input voltage of a buck converter, IoutIs the output current of the buck converter, Trise+TfallFor on and off times, FswIs the switching frequency.
Preferably, the calculation formula of the overall efficiency η is as follows:
wherein, PoutTo output power, PinIs the input power.
Preferably, in S100, the sense resistor voltage is changed in proportion to the load current.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the invention relates to a circuit for realizing power saving of a power supply and a power supply method.A device sensor circuit is used to further achieve the purpose of detecting the voltage of a sensor in real time and simultaneously reacts to a switch circuit to control the method for switching an AC input power; when the load is light, the device sensor circuit informs the buck converter to achieve the effect of frequency reduction, so that the buck converter effectively reduces the switching power consumption; when the rectifier is damaged to cause the capacitor voltage to be abnormal, the switching circuit is informed to be closed through the equipment sensor circuit, and the damage of the buck converter caused by the abnormal capacitor voltage is avoided.
The method and the circuit can reduce the power consumption of the full-bridge PWM rectifier and the buck converter, achieve the purpose of reducing the power consumption of the power system and simultaneously give consideration to the protective function of the power system.
Drawings
The technical scheme of the invention is further explained by combining the accompanying drawings as follows:
FIG. 1 is a schematic diagram of an input PSU of a conventional server product;
FIG. 2 is a schematic diagram of a circuit for saving power of a power supply according to the present invention;
FIG. 3 is a graph of the efficiency of the 700kHz frequency of the present invention;
FIG. 4 is a graph of the efficiency of the 500kHz frequency of the present invention.
Detailed Description
The invention is described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an input PSU of a conventional server product, in which when an AC power source is inserted, the output terminals of the AC PSU have outputs, and when no Device exists, power loss still occurs in the full-bridge PWM rectifier and the buck converter. Even if there is a load, the output efficiency cannot be increased at light load because of the constant switching frequency of the buck converter.
Fig. 2 shows a circuit for saving power of a power supply according to an embodiment of the present invention, which includes an AC input power source, a rectifier, a buck converter, a capacitor, and a load; the rectifier comprises a first diode, a second diode, a third diode and a fourth diode; also included is a device sensor circuit; the equipment sensor circuit comprises a switching circuit, an equipment sensor and a sensing resistor; the output end of the AC input power supply is connected with the switch circuit and is connected with the cathode of the first diode and the anode of the second diode; the cathode of the second diode and the cathode of the fourth diode of the rectifier are connected with the buck converter in series; the buck converter and the sensing resistor are connected in series with the anode of the output device; the negative electrode of the load is connected with the anode of the first diode and the anode of the third diode in series; the equipment sensor is connected with the sensing resistor and the buck converter in parallel and connected with the switching circuit in series; and capacitors are connected in parallel between the rectifier and the buck converter and between the buck converter and the sensing resistor.
The first diode, the second diode, the third diode and the fourth diode in the rectifier are replaced by MOSFETs, and therefore switching efficiency is improved.
The AC input power supply is any one of 12V, 48V and 54V, and can achieve power saving optimization of a server power supply system for PSUs with different 12V, 48V and 54V, and meanwhile, protection of the system power supply is considered, and a future design trend is formed.
The power supply method of the circuit for realizing power saving of the power supply device of the embodiment of the invention comprises the following steps,
s100, detecting voltage difference at two sides of a sensing resistor by an equipment sensor circuit, and calculating load current by using the voltage difference; simultaneously, the equipment sensor circuit detects the capacitor voltage; the voltage of the sensing resistor is changed in direct proportion to the load current;
and S200, judging the load condition according to the magnitude of the load current, and performing circuit control according to the load condition and the capacitor voltage.
Judging the load condition according to the magnitude of the load current, and performing circuit control according to the load condition and the capacitor voltage, wherein the circuit control method comprises the following steps:
when the equipment is not loaded, the equipment sensor circuit controls the switch circuit to be closed;
when the equipment has a load, the equipment sensor circuit controls the buck converter to change the switching frequency according to the magnitude of the load current: the smaller the load current, the switching frequency FswThe lower the switching power consumption P of the buck convertersw_lossThe lower the overall efficiency η is, the higher it is;
when the rectifier is damaged to cause the capacitor voltage to be abnormal, the equipment sensor circuit controls the switch circuit to be closed.
The switching power consumption Psw_lossThe calculation formula of (2) is as follows:
wherein, VinIs the input voltage of a buck converter, IoutIs the output current of the buck converter, Trise+TfallFor on and off times, FswIs the switching frequency.
The calculation formula of the overall efficiency eta is as follows:
wherein, PoutTo output power, PinIs the input power.
Examples
According to the current feedback condition of the equipment, the sensor circuit of the equipment performs circuit control, and the specific content comprises
1. The device sensor circuit end detection circuit device receives a voltage difference of a sensing resistance voltage Vsens, the smaller the Vsens is, the smaller the load current is, and the larger the Vsens is, the larger the load current is.
2. When there is no load, the device sensor circuit informs the switch circuit to turn off, so as to achieve the control method of effectively reducing the power consumption of the rectifier and increasing the efficiency.
3. When the load is light, the device sensor circuit informs the buck converter to achieve the effect of reducing the frequency, so that the buck converter effectively reduces Psw_loss。
As shown in fig. 3 and 4, the efficiency graph of the switching frequency of 700kHz and 500kHz can be seen from fig. 3 and 4:
under the same test conditions, 5V output, output current 10A, comparison of the switching frequency 700kHz with the falling switching frequency 500Hhz, respectively:
switching frequency 700kHz, efficiency 96.93%, switching Power loss: 1.59W;
switching frequency 500kHz, efficiency 97.54%, switching Power loss: 1.26W.
The invention relates to a circuit for realizing power saving of a power supply and a power supply method.A device sensor circuit is used to further achieve the purpose of detecting the voltage of a sensor in real time and simultaneously reacts to a switch circuit to control the method for switching an AC input power; when the load is light, the device sensor circuit informs the buck converter to achieve the effect of frequency reduction, so that the buck converter effectively reduces the switching power consumption; when the rectifier is damaged to cause the capacitor voltage to be abnormal, the switching circuit is informed to be closed through the equipment sensor circuit, and the damage of the buck converter caused by the abnormal capacitor voltage is avoided.
The method and the circuit can reduce the power consumption of the full-bridge PWM rectifier and the buck converter, achieve the purpose of reducing the power consumption of the power system and simultaneously give consideration to the protective function of the power system.
The above-mentioned embodiments are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (8)
1. A circuit for realizing power saving of a power supply comprises an AC input power supply, a rectifier, a buck converter, a capacitor and a load; the rectifier comprises a first diode, a second diode, a third diode and a fourth diode; the method is characterized in that: also included is a device sensor circuit; the equipment sensor circuit comprises a switching circuit, an equipment sensor and a sensing resistor; the output end of the AC input power supply is connected with the switch circuit and is connected with the cathode of the first diode and the anode of the second diode; the cathode of the second diode and the cathode of the fourth diode of the rectifier are connected with the buck converter in series; the buck converter and the sensing resistor are connected in series with the anode of the output device; the negative electrode of the load is connected with the anode of the first diode and the anode of the third diode in series; the equipment sensor is connected with the sensing resistor and the buck converter in parallel and connected with the switching circuit in series; and capacitors are connected in parallel between the rectifier and the buck converter and between the buck converter and the sensing resistor.
2. The circuit of claim 1, wherein the power saving circuit comprises: the first diode, the second diode, the third diode and the fourth diode in the rectifier are replaced by MOSFETs.
3. A circuit as claimed in claim 1 or 2, for saving power in a power supply, wherein: the AC input power supply is any one of 12V, 48V and 54V.
4. A power supply method using the circuit for saving power of a power supply as claimed in claim 1 or 2, wherein: comprises the following steps of (a) carrying out,
s100, detecting voltage difference at two sides of a sensing resistor by an equipment sensor circuit, and calculating load current by using the voltage difference; simultaneously, the equipment sensor circuit detects the capacitor voltage;
and S200, judging the load condition according to the magnitude of the load current, and performing circuit control according to the load condition and the capacitor voltage.
5. The power supply method of claim 4, wherein the power saving circuit further comprises: judging the load condition according to the load current, and controlling the circuit according to the load condition and the capacitor voltage, including
When the equipment is not loaded, the equipment sensor circuit controls the switch circuit to be closed;
when the equipment has a load, the equipment sensor circuit controls the buck converter to change the switching frequency according to the magnitude of the load current: the smaller the load current, the switching frequency FswThe lower the switching power consumption P of the buck convertersw_lossThe lower the overall efficiency η is, the higher it is;
when the rectifier is damaged to cause the capacitor voltage to be abnormal, the equipment sensor circuit controls the switch circuit to be closed.
6. The power supply method of claim 5, wherein the power saving circuit further comprises:
the switching power consumption Psw_lossThe calculation formula of (2) is as follows:
wherein, VinIs the input voltage of a buck converter, IoutIs the output current of the buck converter, Trise+TfallFor on and off times, FswIs the switching frequency.
7. The power supply method of claim 5, wherein the power saving circuit further comprises: the calculation formula of the overall efficiency eta is as follows:
wherein, PoutTo output power, PinIs the input power.
8. The power supply method of claim 4, wherein the power saving circuit further comprises: in S100, the sense resistor voltage is changed in proportion to the load current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011116954.0A CN112290810A (en) | 2020-10-19 | 2020-10-19 | Circuit for realizing power saving of power supply and power supply method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011116954.0A CN112290810A (en) | 2020-10-19 | 2020-10-19 | Circuit for realizing power saving of power supply and power supply method |
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| Publication Number | Publication Date |
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| CN112290810A true CN112290810A (en) | 2021-01-29 |
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| CN202011116954.0A Pending CN112290810A (en) | 2020-10-19 | 2020-10-19 | Circuit for realizing power saving of power supply and power supply method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113849028A (en) * | 2021-10-25 | 2021-12-28 | 杭州和利时自动化有限公司 | Current output type AO circuit |
| TWI817460B (en) * | 2022-04-26 | 2023-10-01 | 宏碁股份有限公司 | Power supply device |
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| US7245113B2 (en) * | 2004-05-21 | 2007-07-17 | Intersil Corporation | High light load efficiency synchronous buck regulator with pulse skipping control |
| CN101453163A (en) * | 2007-11-30 | 2009-06-10 | 英业达股份有限公司 | Apparatus and method for regulating working frequency of step-down conversion circuit by detection current |
| CN102594951A (en) * | 2011-01-05 | 2012-07-18 | 中兴通讯股份有限公司 | Drive control device for backlight of mobile phone display screen and method thereof |
| CN103650314A (en) * | 2011-03-22 | 2014-03-19 | 莱迪尔利恩技术股份有限公司 | Apparatus and method for efficient dc-to-dc conversion through wide voltage swings |
| JP2016025774A (en) * | 2014-07-22 | 2016-02-08 | 株式会社オートネットワーク技術研究所 | Step-down type dc/dc converter |
| CN110957926A (en) * | 2019-11-22 | 2020-04-03 | 深圳南云微电子有限公司 | Light load detection and frequency reduction control method and circuit |
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2020
- 2020-10-19 CN CN202011116954.0A patent/CN112290810A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7245113B2 (en) * | 2004-05-21 | 2007-07-17 | Intersil Corporation | High light load efficiency synchronous buck regulator with pulse skipping control |
| JP2007135287A (en) * | 2005-11-09 | 2007-05-31 | Matsushita Electric Ind Co Ltd | Dc-dc converter |
| CN101453163A (en) * | 2007-11-30 | 2009-06-10 | 英业达股份有限公司 | Apparatus and method for regulating working frequency of step-down conversion circuit by detection current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113849028A (en) * | 2021-10-25 | 2021-12-28 | 杭州和利时自动化有限公司 | Current output type AO circuit |
| TWI817460B (en) * | 2022-04-26 | 2023-10-01 | 宏碁股份有限公司 | Power supply device |
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Application publication date: 20210129 |