CN113315393A - Self-adaptive wide-voltage output circuit of switching power supply - Google Patents
Self-adaptive wide-voltage output circuit of switching power supply Download PDFInfo
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- CN113315393A CN113315393A CN202110556058.4A CN202110556058A CN113315393A CN 113315393 A CN113315393 A CN 113315393A CN 202110556058 A CN202110556058 A CN 202110556058A CN 113315393 A CN113315393 A CN 113315393A
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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
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal 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
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal 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
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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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a self-adaptive wide-voltage output circuit of a switching power supply, which comprises a transformer T1, a PWM (pulse width modulation) main control chip U1, a diode bridge rectifier DB1, an MOS (metal oxide semiconductor) tube Q1, an MOS tube Q2, an MOS tube Q3, a unidirectional thyristor U3, an optical coupler U2B end, an optical coupler U2A end and other components. The invention provides a self-adaptive wide-voltage output circuit of a switching power supply, which can take a CBB capacitor of 0.1 mu F as a primary filter capacitor, and simultaneously can enable the circuit to have the same output power as the prior art, thereby effectively reducing the setting volume of the primary filter CBB capacitor, further reducing the circuit volume and the whole volume of a power adapter, better meeting the social requirements on the power adapter, and better promoting the progress and development of enterprises and industries.
Description
Technical Field
The invention belongs to the field of electricity, and particularly relates to a self-adaptive wide-voltage output circuit of a switching power supply.
Background
Along with the rise of consumer electronic products, the number of power adapters matched with the consumer electronic products is increased, the power is increased, and the size of an input electrolytic capacitor of a traditional adapter is very large, so that the electrolytic capacitor arranged in a circuit needs to occupy a very large space, and the whole size of the power adapter is greatly increased.
The more compact power adapter is more convenient for people to carry and use, so that the requirement of the modern society on the power adapter is reduced. Therefore, how to make the power adapter keep the power unchanged and at the same time, the size of the power adapter can be better reduced is a major research and development direction of enterprises today.
Disclosure of Invention
The invention aims to overcome the problems and provide a self-adaptive wide-voltage output circuit of a switching power supply, which can take a 0.1 mu F CBB capacitor as a primary filter capacitor and simultaneously can enable the circuit to have the same output power as the prior art, thereby effectively reducing the setting volume of the primary filter CBB capacitor, further reducing the circuit volume and the whole volume of a power adapter, better meeting the social requirements on the power adapter and better promoting the progress and development of enterprises and industries.
The purpose of the invention is realized by the following technical scheme:
a self-adaptive wide voltage output circuit of a switching power supply comprises a transformer T1, a PWM main control chip U1, a diode bridge rectifier DB1, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, a unidirectional thyristor U3, an optical coupler U2B end, an optical coupler U2A end, a capacitor C1 connected between the positive output end and the negative output end of the diode bridge rectifier DB1 in series, a resistor R1, one end of which is connected with the positive output end of the diode bridge rectifier DB1 and the other end of which is connected with the HV pin of the PWM main control chip U1 after passing through the resistor R4, a resistor R1, one end of which is connected with the S1 pin of the PWM main control chip U1 and the G pole of the MOS tube Q1, one end of which is connected with the S1 pin of the PWM main control chip U1, the other end of which is connected with the CS 1 pin of the MOS tube Q1, and one end of which is connected with the resistor R1 of the PWM main control chip U1, wherein one end of the resistor R1 is connected with the S1 of the CS pin of the PWM main control chip U1 of the PWM chip U1 and the other end of which is connected with the MOS tube Q1, A resistor R7 with the other end connected with the S pole of the MOS tube Q1, a capacitor C4 connected in series between the CS pin and the GND pin of the PWM main control chip U1, a resistor RS1 with one end connected with the GND pin of the PWM main control chip U1 and the other end connected with the S pole of the MOS tube Q1, a resistor RS2 and a resistor RS3 arranged in parallel with the resistor RS1, a diode D2 with an A pole connected with the 5 pin of the VCC winding of the transformer T1 and a K pole connected with the VCC pin of the PWM main control chip U1, a diode D2 with an A pole connected with the K pole of the diode D2, a diode D3 with a K pole connected with the positive output end of the diode bridge rectifier DB1, a polar capacitor CE2 with an anode connected with the VCC pin of the PWM main control chip U1 and a cathode connected with the negative output end of the diode bridge rectifier DB1, a capacitor C3 connected between the 4 pin and the 4 pin of the series coupler U2B, and a secondary winding C3 connected with the secondary output pin of the transformer T1, A diode D1 with a K pole connected with the 1 pin of the U2A end of the optical coupler after passing through a resistor R6, a resistor R9 connected in series between the 1 pin and the 2 pin of the U2A end of the optical coupler, a capacitor C2 connected in series between the R pole and the K pole of the unidirectional thyristor U3, a resistor R10 connected in series between the R pole and the A pole of the unidirectional thyristor U3, a resistor R8 with one end connected with the R pole of the unidirectional thyristor U3 and the other end connected with the K pole of the diode D1, and a polar capacitor CE1 with an anode connected with the K pole of the diode D1 and a cathode connected with the 7 pin of the secondary output winding of the transformer T1.
Preferably, two input terminals of the diode bridge rectifier DB1 are connected to an L terminal and an N terminal of an AC power source, respectively; the anode of the polar capacitor CE1 is used as a wide voltage output end and outputs 3.3-20V wide voltage, and the cathode of the polar capacitor CE1 is connected with the 7 pins of the secondary output winding of the transformer T1 and is also connected with the SGND; the R pole of the unidirectional thyristor U3 is connected with the FBO pin of the PD platelet.
Preferably, the GND pin of the PWM main control chip U1 is connected to the negative output terminal of the diode bridge rectifier DB1, and the GND pin of the PWM main control chip U1 is connected to the 6 pin of the VCC winding of the transformer T1.
Preferably, pin 1 of the primary N1 winding of the transformer T1 is connected to the positive output terminal of the diode bridge rectifier DB1, pin 2 of the primary N1 winding of the transformer T1 is connected to pin D of the MOS transistor Q1, pin 3 of the primary N2 winding of the transformer T1 is connected to pin D of the MOS transistor Q2, pin 4 of the primary N3 winding of the transformer T1 is connected to pin D of the MOS transistor Q3, and pin 7 of the secondary output winding of the transformer T1 is connected to pin a of the unidirectional thyristor U3.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention takes a CBB capacitor of 0.1 muF as the primary filter capacitor, and simultaneously can ensure that the circuit has the same output power as the prior art, thereby effectively reducing the setting volume of the primary filter CBB capacitor, further reducing the circuit volume and the whole volume of the power adapter, better meeting the requirements of the society on the power adapter, and better promoting the progress and development of enterprises and industries.
Drawings
Fig. 1 is a circuit configuration diagram of the present invention.
Fig. 2 is a voltage waveform diagram of the AC power input voltage rectified by the diode bridge rectifier DB1 and filtered by the capacitor C1 when the present invention is turned on.
Fig. 3 is a graph of the voltage waveform of the present invention when power is supplied to the secondary output winding by CE 3.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Examples
As shown in FIG. 1, a switching power supply adaptive output wide voltage circuit comprises a transformer T1, a PWM main control chip U1, a diode bridge rectifier DB1, a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3, a unidirectional thyristor U3, an optical coupler U2B, an optical coupler U2A, a capacitor C9 connected in series between the positive output end and the negative output end of the diode bridge rectifier DB1, a resistor R1 having one end connected with the positive output end of the diode bridge rectifier DB1 and the other end connected with the HV pin of the PWM main control chip U1 through a resistor R4, a resistor R2 having one end connected with the S1 pin of the PWM main control chip U1 and the other end connected with the G pole of the MOS transistor Q1, a resistor R2 having one end connected with the S2 pin of the PWM main control chip U2 and the other end connected with the G pole of the MOS transistor Q2, a resistor R2 having one end connected with the S2 of the PWM main control chip U2 and the other end connected with the Q2, a resistor R7 having one end connected to the CS pin of the PWM main control chip U1 and the other end connected to the S pole of the MOS transistor Q1, a capacitor C4 connected in series between the CS pin and the GND pin of the PWM main control chip U1, a resistor RS1 having one end connected to the GND pin of the PWM main control chip U1 and the other end connected to the S pole of the MOS transistor Q1, a resistor RS2 and a resistor RS3 provided in parallel with the resistor RS1, a diode D2 having an A pole connected to the 5 pin of the VCC winding of the transformer T1 and a K pole connected to the VCC pin of the PWM main control chip U1, a polar capacitor CE2 having an A pole connected to the K pole of the diode D2 and a K pole connected to the positive output terminal of the diode bridge rectifier DB1, a polar capacitor CE2 having a positive pole connected to the VCC pin of the PWM main control chip U1 and a negative pole connected to the negative output terminal of the diode bridge rectifier DB1, and a capacitor C3 connected in series between the CS pin and the 3 pin of the optical coupler U B, a diode D1 with an a pole connected with the 12 pin of the secondary output winding of the transformer T1 and a K pole connected with the 1 pin of the U2A end of the optical coupler after passing through a resistor R6, a resistor R9 connected in series between the 1 pin and the 2 pin of the U2A end of the optical coupler, a capacitor C2 connected in series between the R pole and the K pole of the unidirectional thyristor U3, a resistor R10 connected in series between the R pole and the a pole of the unidirectional thyristor U3, a resistor R8 with one end connected with the R pole of the unidirectional thyristor U3 and the other end connected with the K pole of the diode D1, and a polar capacitor CE1 with an anode connected with the K pole of the diode D1 and a cathode connected with the 7 pin of the secondary output winding of the transformer T1.
Two input ends of the diode bridge rectifier DB1 are respectively connected with an L end and an N end of an AC power supply; the anode of the polar capacitor CE1 is used as a wide voltage output end and outputs 3.3-20V wide voltage, and the cathode of the polar capacitor CE1 is connected with the 7 pins of the secondary output winding of the transformer T1 and is also connected with the SGND; the R pole of the unidirectional thyristor U3 is connected with the FBO pin of the PD platelet. And a GND pin of the PWM main control chip U1 is connected with a negative output end of the diode bridge rectifier DB1, and a GND pin of the PWM main control chip U1 is connected with a 6 pin of a VCC winding of the transformer T1. A 1 pin of a primary N1 winding of the transformer T1 is connected with a positive output end of a diode bridge rectifier DB1, a 2 pin of a primary N1 winding of the transformer T1 is connected with a D pin of a MOS tube Q1, a 3 pin of a primary N2 winding of the transformer T1 is connected with the D pin of the MOS tube Q2, a 4 pin of a primary N3 winding of the transformer T1 is connected with a D pin of a MOS tube Q3, and a 7 pin of a secondary output winding of the transformer T1 is connected with an A pole of a unidirectional thyristor U3.
The capacitance value of the capacitor C1 is 0.1 muF.
The circuit principle is as follows:
when the power-on device is started, the input voltage of an AC power supply is rectified by a diode bridge rectifier DB1 and filtered by a capacitor C1 to obtain a voltage waveform as shown in fig. 2, starting voltage is provided for a PWM main control chip U1 from the positive electrode of the capacitor C1 through a resistor R1 and a resistor R4, a primary N1 winding, a primary N2 winding and a primary N3 winding of a transformer T1 are powered up through one path of voltage, at the moment, an S1 pin, an S2 pin and an S3 pin of the PWM main control chip U1 are all low level, and an MOS tube Q1, an MOS tube Q2 and an MOS tube Q3 do not participate in work. At this time, the PWM main control chip U1 detects the voltage of the polar capacitor CE1 through the resistor R1 and the resistor R2, and when the voltage exceeds the internal set value V3, the S3 pin of the PWM main control chip U1 outputs a PWM control MOS transistor Q3 to be turned on, and current flows from the positive electrode of the capacitor C1 to the 4 pin through the 1 pin of the transformer T1, flows through the resistor RS3 through the control of the MOS transistor Q3, and returns to the negative electrode of the capacitor C1. The secondary winding is rectified by a diode D1 and filtered by a polar capacitor CE1 through the induced voltage, and then supplies power to the secondary output winding to drive a load. When the voltage of the capacitor C1 drops to be lower than the voltage value of V3, the PWM main control chip U1 detects that the voltage is in the voltage value range of V2, the pin S3 of the PWM main control chip U1 is at low voltage, the pin S2 of the PWM main control chip U1 drives the MOS tube Q2 to work, the voltage flows from the positive pole of the capacitor C1 to the pin 1 of the transformer T1 and flows from the pin 3 to the MOS tube Q2 and the resistor RS2, and returns to the negative pole of the capacitor C1, the energy conversion is undertaken by the MOS tube Q2, when the PWM main control chip U1 detects that the voltage is lower than the internal set value V2, the pin S2 of the PWM main control chip U1 becomes low voltage, the MOS tube Q2 does not work, and the power conversion is completed by the pin S1 of the PWM main control chip U1, the pin Q1, the pin 1 and the pin 2 of the transformer T1 and the resistor RS 1. When the PWM main control chip U1 detects that the voltage rises and exceeds V1, the voltage is converted to work of an S2 pin, an MOS tube Q2, a 1 pin and a 3 pin of a transformer T1 and a resistor RS2, and when the voltage rises to V3, the voltage is converted to work of an S3 pin, an MOS tube Q3, a 1 pin and a 4 pin of a transformer T1 and a resistor RS 3. This mode of operation provides sufficient energy to the secondary at lower voltages and provides better impedance matching than the single path alone.
However, the above circuit does not use an electrolytic rectification filter circuit, and has the disadvantage that the secondary output winding of the transformer T1 is powered down when zero-crossing occurs, so that PD and other products including MCU are powered down. The present application addresses this drawback using diode D3 and polar capacitor CE 2. When the voltage is lower than the voltage value of the polar capacitor CE2, the polar capacitor CE2 supplies energy to the secondary output winding, and the defect that part of the voltage returns to zero is buffered, and a specific voltage waveform diagram is shown in fig. 3.
As described above, the present invention can be preferably realized.
Claims (4)
1. A self-adaptive output wide-voltage circuit of a switching power supply is characterized in that: the power supply circuit is composed of a transformer T1, a PWM main control chip U1, a diode bridge rectifier DB1, an MOS tube Q1, an MOS tube Q2, an MOS tube Q3, a unidirectional thyristor U3, an optical coupler U2B, an optical coupler U2A, a capacitor C1 connected in series between the positive output end and the negative output end of the diode bridge rectifier DB1, a resistor R1 having one end connected with the positive output end of the diode bridge rectifier DB1 and the other end connected with the HV pin of the PWM main control chip U1 through the resistor R1, a resistor R1 having one end connected with the S1 pin of the PWM main control chip U1 and the other end connected with the G pole of the MOS tube Q1, a resistor R1 having one end connected with the S1 of the PWM main control chip U1 and the other end connected with the CS pole of the MOS tube Q1, a capacitor C4 connected in series between the CS pin and the GND pin of the PWM main control chip U1, a resistor RS1 having one end connected to the GND pin of the PWM main control chip U1 and the other end connected to the S pole of the MOS transistor Q1, a resistor RS2 and a resistor RS3 arranged in parallel with the resistor RS1, a diode D2 having an A pole connected to the 5 pin of the VCC winding of the transformer T1 and a K pole connected to the VCC pin of the PWM main control chip U1, a diode D3 having an A pole connected to the K pole of the diode D2 and a K pole connected to the positive output terminal of the diode bridge rectifier DB1, a polarity capacitor C3 having an A pole connected to the VCC pin of the PWM main control chip U1 and a negative pole connected to the negative output terminal of the diode bridge rectifier DB1, a capacitor C3 connected in series between the 4 pin and the 3 pin of the optocoupler U2B, and a diode D5739 having an A pole connected to the 12 pin of the secondary output winding of the transformer T1 and a K pole connected to the CE 6342 through a resistor R5928, a resistor R9 connected in series between the 1 pin and the 2 pin of the U2A end of the optical coupler, a capacitor C2 connected in series between the R pole and the K pole of the unidirectional thyristor U3, a resistor R10 connected in series between the R pole and the A pole of the unidirectional thyristor U3, a resistor R8 with one end connected with the R pole of the unidirectional thyristor U3 and the other end connected with the K pole of the diode D1, and a polarity capacitor CE1 with the positive pole connected with the K pole of the diode D1 and the negative pole connected with the 7 pin of the secondary output winding of the transformer T1.
2. The adaptive output wide voltage circuit of the switching power supply as claimed in claim 1, wherein: two input ends of the diode bridge rectifier DB1 are respectively connected with an L end and an N end of an AC power supply; the anode of the polar capacitor CE1 is used as a wide voltage output end and outputs 3.3-20V wide voltage, and the cathode of the polar capacitor CE1 is connected with the 7 pins of the secondary output winding of the transformer T1 and is also connected with the SGND; the R pole of the unidirectional thyristor U3 is connected with the FBO pin of the PD platelet.
3. The adaptive output wide voltage circuit of the switching power supply according to claim 2, wherein: and a GND pin of the PWM main control chip U1 is connected with a negative output end of the diode bridge rectifier DB1, and a GND pin of the PWM main control chip U1 is connected with a 6 pin of a VCC winding of the transformer T1.
4. The adaptive output wide voltage circuit of the switching power supply as claimed in claim 3, wherein: a 1 pin of a primary N1 winding of the transformer T1 is connected with a positive output end of a diode bridge rectifier DB1, a 2 pin of a primary N1 winding of the transformer T1 is connected with a D pin of a MOS tube Q1, a 3 pin of a primary N2 winding of the transformer T1 is connected with the D pin of the MOS tube Q2, a 4 pin of a primary N3 winding of the transformer T1 is connected with a D pin of a MOS tube Q3, and a 7 pin of a secondary output winding of the transformer T1 is connected with an A pole of a unidirectional thyristor U3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110556058.4A CN113315393A (en) | 2021-05-21 | 2021-05-21 | Self-adaptive wide-voltage output circuit of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110556058.4A CN113315393A (en) | 2021-05-21 | 2021-05-21 | Self-adaptive wide-voltage output circuit of switching power supply |
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| CN113315393A true CN113315393A (en) | 2021-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110556058.4A Pending CN113315393A (en) | 2021-05-21 | 2021-05-21 | Self-adaptive wide-voltage output circuit of switching power supply |
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Citations (7)
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| CN101919147A (en) * | 2008-02-22 | 2010-12-15 | 村田电源 | Power conversion method and device with wide input voltage range |
| WO2012155325A1 (en) * | 2011-05-16 | 2012-11-22 | Intersil Americas Inc. | Dc/dc power converter with wide input voltage range |
| CN103199709A (en) * | 2012-03-12 | 2013-07-10 | 崇贸科技股份有限公司 | Two-Switch Flyback Power Converter |
| TW201345131A (en) * | 2012-04-23 | 2013-11-01 | Delta Electronics Inc | Power converter and method of controlling the same |
| CN203859685U (en) * | 2014-05-16 | 2014-10-01 | 常州轻工职业技术学院 | An experiment box including various led experiment modules |
| CN107231090A (en) * | 2016-03-23 | 2017-10-03 | 施耐德电气工业公司 | Switch mode power |
| CN206595898U (en) * | 2017-03-24 | 2017-10-27 | 无锡硅动力微电子股份有限公司 | Secondary inverse-excitation type switch power-supply based on SP6650 |
-
2021
- 2021-05-21 CN CN202110556058.4A patent/CN113315393A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101919147A (en) * | 2008-02-22 | 2010-12-15 | 村田电源 | Power conversion method and device with wide input voltage range |
| WO2012155325A1 (en) * | 2011-05-16 | 2012-11-22 | Intersil Americas Inc. | Dc/dc power converter with wide input voltage range |
| CN103199709A (en) * | 2012-03-12 | 2013-07-10 | 崇贸科技股份有限公司 | Two-Switch Flyback Power Converter |
| TW201345131A (en) * | 2012-04-23 | 2013-11-01 | Delta Electronics Inc | Power converter and method of controlling the same |
| CN203859685U (en) * | 2014-05-16 | 2014-10-01 | 常州轻工职业技术学院 | An experiment box including various led experiment modules |
| CN107231090A (en) * | 2016-03-23 | 2017-10-03 | 施耐德电气工业公司 | Switch mode power |
| CN206595898U (en) * | 2017-03-24 | 2017-10-27 | 无锡硅动力微电子股份有限公司 | Secondary inverse-excitation type switch power-supply based on SP6650 |
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Address after: Room 101-401, building 38, digital Silicon Valley Industrial Park, No. 999, Yinhuang East Road, Maanshan economic and Technological Development Zone, 243000, Anhui Province Applicant after: Dongke semiconductor (Anhui) Co.,Ltd. Address before: Room 101-401, building 38, digital Silicon Valley Industrial Park, No. 999, Yinhuang East Road, Maanshan economic and Technological Development Zone, 243000, Anhui Province Applicant before: ANHUI DONGKE SEMICONDUCTOR Co.,Ltd. |
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