CN111142041A - Power supply testing device - Google Patents
Power supply testing device Download PDFInfo
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- CN111142041A CN111142041A CN202010027341.3A CN202010027341A CN111142041A CN 111142041 A CN111142041 A CN 111142041A CN 202010027341 A CN202010027341 A CN 202010027341A CN 111142041 A CN111142041 A CN 111142041A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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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
- H02H7/1213—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 DC-DC converters
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The power supply testing device of the invention comprises: the type of the control chip is UCC28700, and a GND pin of the control chip is grounded; the starting circuit is electrically connected with a VDD pin of the control chip; the current sampling circuit is electrically connected with a DRV pin and a CS pin of the control chip; the voltage sampling circuit is electrically connected with a VS pin of the control chip; and one end of the fuse F1 is electrically connected with a signal input end, and the other end of the fuse F1 is electrically connected with the voltage sampling circuit. Compared with the prior art, the invention has the following advantages: the input end of the UCC28700 is connected with a fuse in series, and when the current of the input end is overlarge, the input power supply is directly disconnected, so that the circuit can be prevented from being burnt, and the safety of a tester can be ensured.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a power supply testing device.
Background
In the prior art, Chinese patent 'a high-voltage DC/DC switching power supply' (publication number: 203445790U) can be directly used in a power unit of a medium-high voltage frequency converter and a medium-voltage inverter. The main circuit of the device is composed of a plurality of basic transformation modules, wherein each basic transformation module comprises two transistors Q1 and Q2; two voltage-dividing capacitors C1 and C2; two voltage-sharing resistors R1 and R2; a dc blocking capacitor C3; a high-frequency transformer T1; four rectifier diodes D1-D4, voltage-dividing capacitors C1 and C2 and the transistors Q1 and Q2 are connected into a half-bridge conversion structure, and a DC blocking capacitor C3 is connected in series between the output end of the half-bridge conversion structure and the primary coil of the high-frequency transformer T1. The secondary side output of the high-frequency transformer T1 is subjected to full-bridge rectification by diodes D1-D4, the input ends of all basic transformation modules are connected in series, and the output ends of all basic transformation modules are connected in parallel. Because of adopting the design of the basic conversion module, the structure is simple, even if a transistor with low voltage level is used, the input voltage can be improved, and the cost performance is high; the input voltage can be directly taken from the power unit of the medium-high voltage frequency converter and the direct current bus of the medium-voltage inverter, and the system operation stability is high; higher input voltages can be easily achieved by adding a basic conversion module.
However, when the high-voltage DCDC power supply driven by the UCC28700 is tested, if the testing method is incorrect, interference is introduced, the switch tube is damaged, the machine is seriously exploded, and the safety of testing personnel is caused.
Disclosure of Invention
In view of the defects in the prior art, the present invention aims to provide a power testing device that solves the above technical problems.
In order to solve the above technical problem, the power supply testing apparatus of the present invention includes: the type of the control chip is UCC28700, and a GND pin of the control chip is grounded;
the starting circuit is electrically connected with a VDD pin of the control chip;
the current sampling circuit is electrically connected with a DRV pin and a CS pin of the control chip;
the voltage sampling circuit is electrically connected with a VS pin of the control chip;
a fuse F1, wherein one end of the fuse F1 is electrically connected with the signal input end, and the other end of the fuse F1 is electrically connected with the voltage sampling circuit; wherein
The voltage sampling circuit includes:
the transformer T3, the transformer T3 is a three-winding transformer, and the other end of the fuse F1 is electrically connected with the primary winding of the transformer T3;
one end of the resistor R59 is electrically connected with the auxiliary winding of the transformer T3, and the other end of the resistor R59 is electrically connected with a VS pin of the control chip;
and one end of the resistor R47 is electrically connected with the other end of the resistor R59, and the other end of the resistor R47 is grounded.
Preferably, the starting circuit comprises a resistor R66, a resistor R44, a resistor R46, a resistor R48, a resistor R50, a resistor R3 and a capacitor C51; wherein
The resistor R66, the resistor R44, the resistor R46, the resistor R48, the resistor R50 and the resistor R3 are sequentially connected in series, one end of the resistor R66 is electrically connected with the other end of the fuse F1, and one end of the resistor R3 is electrically connected with a VDD pin of the control chip;
one end of the capacitor C51 is electrically connected to one end of the resistor R3, and the other end of the capacitor C51 is grounded.
Preferably, the current sampling circuit includes:
a switch tube Q2, wherein the gate of the switch tube Q2 is electrically connected with the DRV pin of the control chip, and the drain of the switch tube Q2 is electrically connected with the primary winding of the transformer T3;
and one end of the sampling unit is electrically connected with the source electrode of the switching tube Q2, and the other end of the sampling unit is grounded.
Preferably, the current sampling circuit further comprises a filtering unit, and the filtering unit is connected with one end of the sampling unit and a CS pin of the control chip.
Preferably, the sampling unit includes:
one end of the resistor R42 is electrically connected with the source electrode of the switch tube Q2, and the other end of the resistor R42 is grounded;
and one end of the resistor R91 is electrically connected with the source of the switching tube Q2, and the other end of the resistor R91 is grounded.
Preferably, the filtering unit includes:
one end of the resistor R37 is electrically connected with one end of the resistor R42 and one end of the resistor R91, and the other end of the resistor R37 is electrically connected with a CS pin of the control chip;
and one end of the capacitor C40 is electrically connected with the other end of the resistor R37, and the other end of the capacitor C40 is grounded.
Preferably, the output winding of the transformer T3 is electrically connected to an output circuit.
Preferably, the output circuit includes:
a diode D7, wherein the anode of the diode D7 is electrically connected with the output winding of the transformer T3;
one end of each of the capacitor C42, the capacitor C4, the capacitor C45, and the resistor R40 is electrically connected to the cathode of the diode D7, and the other end of each of the capacitor C42, the capacitor C4, the capacitor C45, and the resistor R40 is grounded;
the capacitor C48 and the resistor R41, one end of the capacitor C48 is electrically connected with the anode of the diode D7, one end of the resistor R41 is electrically connected with the other end of the capacitor C48, and the other end of the resistor R41 is electrically connected with the cathode of the diode D7.
Preferably, a snubber circuit is further included, the snubber circuit connecting the fuse F1 and the primary winding of the transformer T3.
Preferably, the absorption circuit includes:
a zener diode D1, the anode of the zener diode D1 being electrically connected to the fuse F1;
a resistor R2, wherein one end of the resistor R2 is electrically connected with the cathode of the zener diode D1;
a diode D10, wherein the cathode of the diode D10 is electrically connected with the other end of the resistor R2, and the anode of the diode D10 is electrically connected with the primary winding of the transformer T3;
and one end of the capacitor C50 is electrically connected with the positive electrode of the voltage stabilizing diode D1, and the other end of the capacitor C50 is electrically connected with the negative electrode of the voltage stabilizing diode D1.
Compared with the prior art, the invention has the following advantages:
the input end of the UCC28700 is connected with a fuse in series, and when the current of the input end is overlarge, the input power supply is directly disconnected, so that the circuit can be prevented from being burnt, and the safety of a tester can be ensured.
Drawings
Other characteristic objects and advantages of the invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following figures.
FIG. 1 is a schematic diagram of a power testing apparatus according to the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention.
The invention protects the safety of testers by adding the fuse. The selection type of the fuse is selected according to the primary peak current of the high-voltage flyback, and the protection effect can be effectively achieved. When the current is too large, the fuse blows, thereby cutting off the external high-voltage power supply.
As shown in fig. 1, the power supply testing apparatus of the present invention includes: the type of the control chip is UCC28700, and a GND pin of the control chip is grounded;
the starting circuit is electrically connected with a VDD pin of the control chip;
the current sampling circuit is electrically connected with a DRV pin and a CS pin of the control chip;
the voltage sampling circuit is electrically connected with a VS pin of the control chip;
one end of a fuse F1 is electrically connected with the signal input end, and the other end of the fuse F1 is electrically connected with the voltage sampling circuit; wherein
The voltage sampling circuit includes:
the transformer T3, the transformer T3 is a three-winding transformer, and the other end of the fuse F1 is electrically connected with the primary winding of the transformer T3;
one end of a resistor R59, one end of a resistor R59 are electrically connected with an auxiliary winding of the transformer T3, and the other end of the resistor R59 is electrically connected with a VS pin of the control chip;
one end of the resistor R47 and one end of the resistor R47 are electrically connected with the other end of the resistor R59, and the other end of the resistor R47 is grounded.
The starting circuit comprises a resistor R66, a resistor R44, a resistor R46, a resistor R48, a resistor R50, a resistor R3 and a capacitor C51; wherein
The resistor R66, the resistor R44, the resistor R46, the resistor R48, the resistor R50 and the resistor R3 are sequentially connected in series, one end of the resistor R66 is electrically connected with the other end of the fuse F1, and one end of the resistor R3 is electrically connected with a VDD pin of the control chip;
one end of the capacitor C51 is electrically connected to one end of the resistor R3, and the other end of the capacitor C51 is grounded.
The current sampling circuit includes:
a switch tube Q2, wherein the grid of the switch tube Q2 is electrically connected with the DRV pin of the control chip, and the drain of the switch tube Q2 is electrically connected with the primary winding of the transformer T3;
and one end of the sampling unit is electrically connected with the source electrode of the switching tube Q2, and the other end of the sampling unit is grounded.
The current sampling circuit further comprises a filtering unit, and the filtering unit is connected with one end of the sampling unit and a CS pin of the control chip.
The sampling unit includes:
one end of a resistor R42, one end of a resistor R42 is electrically connected with the source electrode of the switching tube Q2, and the other end of the resistor R42 is grounded;
one end of the resistor R91 and one end of the resistor R91 are electrically connected with the source electrode of the switch tube Q2, and the other end of the resistor R91 is grounded.
The filtering unit includes:
one end of a resistor R37 and one end of a resistor R37 are electrically connected with one end of the resistor R42 and one end of the resistor R91, and the other end of the resistor R37 is electrically connected with a CS pin of the control chip;
one end of the capacitor C40 and one end of the capacitor C40 are electrically connected with the other end of the resistor R37, and the other end of the capacitor C40 is grounded.
The output winding of the transformer T3 is electrically connected to the output circuit.
The output circuit includes:
a diode D7, wherein the anode of the diode D7 is electrically connected with the output winding of the transformer T3;
one end of each of the capacitor C42, the capacitor C4, the capacitor C45 and the resistor R40, one end of each of the capacitor C42, the capacitor C4, the capacitor C45 and the resistor R40 is electrically connected to the cathode of the diode D7, and the other end of each of the capacitor C42, the capacitor C4, the capacitor C45 and the resistor R40 is grounded;
the capacitor C48 and the resistor R41, one end of the capacitor C48 is electrically connected to the positive electrode of the diode D7, one end of the resistor R41 is electrically connected to the other end of the capacitor C48, and the other end of the resistor R41 is electrically connected to the negative electrode of the diode D7.
The circuit also comprises a snubber circuit, and the snubber circuit is connected with the fuse F1 and the primary winding of the transformer T3.
The absorption circuit includes:
the anode of the voltage-stabilizing diode D1 and the anode of the voltage-stabilizing diode D1 are electrically connected with the fuse F1;
one end of the resistor R2, one end of the resistor R2 is electrically connected with the cathode of the voltage stabilizing diode D1;
a diode D10, wherein the cathode of the diode D10 is electrically connected with the other end of the resistor R2, and the anode of the diode D10 is electrically connected with the primary winding of the transformer T3;
one end of the capacitor C50 and one end of the capacitor C50 are electrically connected with the positive electrode of the voltage stabilizing diode D1, and the other end of the capacitor C50 is electrically connected with the negative electrode of the voltage stabilizing diode D1.
The working principle is as follows:
current sampling is realized by connecting 2 sampling resistors (resistors R42 and R91) in parallel, one end of the current sampling is electrically connected with a source electrode of a switching tube, and is fed back to UCC28700 for detection through an RC filter circuit (a resistor R37 and a capacitor C40), and the other end of the current sampling is electrically connected with GND (ground) at a high-voltage side;
the voltage sampling is composed of auxiliary windings (1-8) of a transformer T3, a resistor R59 and a resistor R47. The voltage sampling is realized by adding resistance voltage division to an auxiliary winding of a transformer, one end of the voltage sampling is electrically connected with the auxiliary winding of the transformer, and the voltage is transmitted to the UCC28700 for detection through the resistance voltage division;
the transformer is a three-winding transformer, wherein a winding between a pin 2 and a pin 5 of the transformer is a primary winding, a winding between a pin 1 and a pin 8 of the transformer is an auxiliary winding, and a winding between a pin 3 and a pin 4 of the transformer is an output winding;
a pin 5 at the same name end of the primary winding of the transformer is electrically connected with one end of a fuse F1, and a pin 2 of the transformer is electrically connected with the drain electrode of a switch tube Q2;
a pin 1 of the dotted terminal of the transformer auxiliary winding is electrically connected with GND, and a pin 8 of the transformer is electrically connected with one end of a voltage-dividing resistor for voltage sampling;
and 3 pins of the same-name ends of the transformer output windings are electrically connected with GND, and 4 pins of the transformer are electrically connected with a rectifier diode D7.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A power supply testing apparatus, comprising:
the type of the control chip is UCC28700, and a GND pin of the control chip is grounded;
the starting circuit is electrically connected with a VDD pin of the control chip;
the current sampling circuit is electrically connected with a DRV pin and a CS pin of the control chip;
the voltage sampling circuit is electrically connected with a VS pin of the control chip;
a fuse F1, wherein one end of the fuse F1 is electrically connected with the signal input end, and the other end of the fuse F1 is electrically connected with the voltage sampling circuit; wherein
The voltage sampling circuit includes:
the transformer T3, the transformer T3 is a three-winding transformer, and the other end of the fuse F1 is electrically connected with the primary winding of the transformer T3;
one end of the resistor R59 is electrically connected with the auxiliary winding of the transformer T3, and the other end of the resistor R59 is electrically connected with a VS pin of the control chip;
and one end of the resistor R47 is electrically connected with the other end of the resistor R59, and the other end of the resistor R47 is grounded.
2. The power supply testing device of claim 1, wherein the start-up circuit comprises a resistor R66, a resistor R44, a resistor R46, a resistor R48, a resistor R50, a resistor R3, and a capacitor C51; wherein
The resistor R66, the resistor R44, the resistor R46, the resistor R48, the resistor R50 and the resistor R3 are sequentially connected in series, one end of the resistor R66 is electrically connected with the other end of the fuse F1, and one end of the resistor R3 is electrically connected with a VDD pin of the control chip;
one end of the capacitor C51 is electrically connected to one end of the resistor R3, and the other end of the capacitor C51 is grounded.
3. The power supply test device of claim 2, wherein the current sampling circuit comprises:
a switch tube Q2, wherein the gate of the switch tube Q2 is electrically connected with the DRV pin of the control chip, and the drain of the switch tube Q2 is electrically connected with the primary winding of the transformer T3;
and one end of the sampling unit is electrically connected with the source electrode of the switching tube Q2, and the other end of the sampling unit is grounded.
4. The power supply testing device according to claim 3, wherein the current sampling circuit further comprises a filtering unit, and the filtering unit is connected with one end of the sampling unit and the CS pin of the control chip.
5. The power supply test device according to claim 4, wherein the sampling unit includes:
one end of the resistor R42 is electrically connected with the source electrode of the switch tube Q2, and the other end of the resistor R42 is grounded;
and one end of the resistor R91 is electrically connected with the source of the switching tube Q2, and the other end of the resistor R91 is grounded.
6. The power supply test device according to claim 5, wherein the filter unit includes:
one end of the resistor R37 is electrically connected with one end of the resistor R42 and one end of the resistor R91, and the other end of the resistor R37 is electrically connected with a CS pin of the control chip;
and one end of the capacitor C40 is electrically connected with the other end of the resistor R37, and the other end of the capacitor C40 is grounded.
7. The power supply testing device of claim 6, wherein the output winding of the transformer T3 is electrically connected to an output circuit.
8. The power supply test device of claim 7, wherein the output circuit comprises:
a diode D7, wherein the anode of the diode D7 is electrically connected with the output winding of the transformer T3;
one end of each of the capacitor C42, the capacitor C4, the capacitor C45, and the resistor R40 is electrically connected to the cathode of the diode D7, and the other end of each of the capacitor C42, the capacitor C4, the capacitor C45, and the resistor R40 is grounded;
the capacitor C48 and the resistor R41, one end of the capacitor C48 is electrically connected with the anode of the diode D7, one end of the resistor R41 is electrically connected with the other end of the capacitor C48, and the other end of the resistor R41 is electrically connected with the cathode of the diode D7.
9. The power supply testing device of claim 8, further comprising a snubber circuit connecting the fuse F1 and the primary winding of the transformer T3.
10. The power supply test device of claim 9, wherein the absorption circuit comprises:
a zener diode D1, the anode of the zener diode D1 being electrically connected to the fuse F1;
a resistor R2, wherein one end of the resistor R2 is electrically connected with the cathode of the zener diode D1;
a diode D10, wherein the cathode of the diode D10 is electrically connected with the other end of the resistor R2, and the anode of the diode D10 is electrically connected with the primary winding of the transformer T3;
and one end of the capacitor C50 is electrically connected with the positive electrode of the voltage stabilizing diode D1, and the other end of the capacitor C50 is electrically connected with the negative electrode of the voltage stabilizing diode D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010027341.3A CN111142041A (en) | 2020-01-10 | 2020-01-10 | Power supply testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010027341.3A CN111142041A (en) | 2020-01-10 | 2020-01-10 | Power supply testing device |
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| Publication Number | Publication Date |
|---|---|
| CN111142041A true CN111142041A (en) | 2020-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010027341.3A Pending CN111142041A (en) | 2020-01-10 | 2020-01-10 | Power supply testing device |
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| CN (1) | CN111142041A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421822A (en) * | 2022-01-24 | 2022-04-29 | 浙江三锋实业股份有限公司 | Intelligent control method of brushless motor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203289341U (en) * | 2013-01-07 | 2013-11-13 | 昂宝电子（上海）有限公司 | Flyback switch power supply circuit |
| CN203884030U (en) * | 2014-03-26 | 2014-10-15 | 东莞市冠日光电科技有限公司 | LED switching power source adopting primary side control technology |
| CN105375783A (en) * | 2015-11-13 | 2016-03-02 | 广州金升阳科技有限公司 | Feedback control method, feedback control method based control method for asymmetric half bridge type flyback converter, and realization circuits for two methods |
| CN105576955A (en) * | 2016-01-30 | 2016-05-11 | 深圳南云微电子有限公司 | High voltage starting circuit and high voltage starting method |
| CN109412422A (en) * | 2018-12-12 | 2019-03-01 | 上海伊控动力系统有限公司 | A kind of high pressure power-supply circuit of wide scope input |
| CN109861561A (en) * | 2018-12-29 | 2019-06-07 | 深圳日辉达电源股份有限公司 | A kind of Switching Power Supply |
-
2020
- 2020-01-10 CN CN202010027341.3A patent/CN111142041A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203289341U (en) * | 2013-01-07 | 2013-11-13 | 昂宝电子（上海）有限公司 | Flyback switch power supply circuit |
| CN203884030U (en) * | 2014-03-26 | 2014-10-15 | 东莞市冠日光电科技有限公司 | LED switching power source adopting primary side control technology |
| CN105375783A (en) * | 2015-11-13 | 2016-03-02 | 广州金升阳科技有限公司 | Feedback control method, feedback control method based control method for asymmetric half bridge type flyback converter, and realization circuits for two methods |
| CN105576955A (en) * | 2016-01-30 | 2016-05-11 | 深圳南云微电子有限公司 | High voltage starting circuit and high voltage starting method |
| CN109412422A (en) * | 2018-12-12 | 2019-03-01 | 上海伊控动力系统有限公司 | A kind of high pressure power-supply circuit of wide scope input |
| CN109861561A (en) * | 2018-12-29 | 2019-06-07 | 深圳日辉达电源股份有限公司 | A kind of Switching Power Supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421822A (en) * | 2022-01-24 | 2022-04-29 | 浙江三锋实业股份有限公司 | Intelligent control method of brushless motor |
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Application publication date: 20200512 |
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