CN111541363A - High-power-based anode power supply of Hall electric thruster - Google Patents
High-power-based anode power supply of Hall electric thruster Download PDFInfo
- Publication number
- CN111541363A CN111541363A CN202010339923.5A CN202010339923A CN111541363A CN 111541363 A CN111541363 A CN 111541363A CN 202010339923 A CN202010339923 A CN 202010339923A CN 111541363 A CN111541363 A CN 111541363A
- Authority
- CN
- China
- Prior art keywords
- circuit
- power
- output
- voltage
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- H02H7/1203—Circuits independent of the type of conversion
-
- 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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inverter Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The anode power supply of the Hall electric thruster based on high power is designed in the form of an input filter circuit and an output filter circuit, adopts a reasonable power conversion circuit and a voltage stabilizing/current limiting double closed-loop control system, achieves the effects of anti-interference and electromagnetic compatibility, achieves the effect of meeting the requirements of voltage, power output and dynamic characteristics through the design of the power conversion circuit and a control method, and has the advantages of wide output voltage range, stable output voltage, good dynamic regulation characteristics and strong anti-interference capability on the premise of carrying out fault diagnosis and isolation processing on the circuit.
Description
Technical Field
The invention relates to an anode power supply of a high-power Hall electric propeller, belonging to the technical field of Hall electric propulsion of aerospace vehicles.
Background
In the development of spacecraft propulsion technology, a Hall electric propeller is a special device, the Hall electric propulsion technology and the Hall electric propulsion device have wide application prospect and application value, and a power processing unit is the core of a Hall electric propulsion power supply system. Therefore, the research on the hall electric propulsion power processing unit is very important, and the reliability, safety and stability of the operation of the hall electric propulsion power processing unit are decisive for the application reliability of the hall electric propulsion device. The Hall electric propulsion power processing unit comprises a plurality of power supplies, the anode power supply is one of the power supplies, the power of the anode power supply accounts for more than 90% of the power processing unit, the working time is longest, and the power supply is the core of stable and reliable work of the power processing unit. Therefore, the anode power supply adopts a new topological structure to improve the efficiency of the power conversion circuit, the closed-loop control response is fast, the soft start circuit is adopted to reduce the surge current, the EMI filter circuit reduces the reflection ripple, the over-current, over-voltage and under-voltage protection circuits are added, and the reliability and the safety of the product are improved.
Disclosure of Invention
The technical problem solved by the invention is as follows: the anode power supply of the Hall electric thruster based on high power is provided aiming at the problems that the existing anode power supply is low in power conversion efficiency, slow in closed-loop regulation, large in starting surge current, large in reflection ripple, lack of a protection circuit and the like in the prior art and electromagnetic interference defects easily occur in the working process.
The technical scheme for solving the technical problems is as follows:
the utility model provides a hall electric propulsor's positive pole power based on high power, includes input voltage electric current sampling circuit, power access break-make and surge suppression circuit, input EMI filter circuit, power conversion circuit, output filter and output voltage electric current sampling circuit, output isolation circuit, wherein:
the input voltage and current sampling circuit collects input current and transmits the input current to the power path on-off and surge suppression circuit, the power path on-off and surge suppression circuit receives an external control instruction to control the power path to be switched on or switched off, output current of the input EMI filter circuit is prevented from surging when the power path is switched on, the input EMI filter circuit carries out differential mode and common mode filtering processing on the input current and transmits current to the power conversion circuit when the power path is switched on, the power conversion circuit converts the input current according to power required by the external Hall electric thruster and outputs the converted input current to the output isolation circuit after the filtered processing by the output filtering and output voltage and current sampling circuit, and the output isolation circuit outputs current to the external Hall electric thruster and isolates the output current from other external power supplies;
the input voltage and current sampling circuit collects input voltage and transmits the input voltage to the power path on-off and surge suppression circuit, the power path on-off and surge suppression circuit receives an external control instruction to control the power path to be switched on or switched off, output voltage of the input EMI filter circuit is prevented from surging when the power path is switched on, the input EMI filter circuit carries out differential mode and common mode filtering processing on the input voltage and transmits the voltage to the power conversion circuit when the power path is switched on, the power conversion circuit converts the input voltage according to power required by the external Hall electric thruster and outputs the converted input voltage to the output isolation circuit after the filtered processing of the output filtering and output voltage and current sampling circuit, and the output isolation circuit outputs the voltage to the external Hall electric thruster and is isolated from output voltages of other external power supplies.
The output filtering and output voltage and current sampling circuit outputs current or voltage, an EA control signal is generated by the voltage stabilizing and current limiting control circuit, and the isolated drive control circuit and the power conversion circuit output constant voltage or constant current to the output isolation circuit according to the EA control signal.
The output current of the input voltage and current sampling circuit is judged through the overcurrent protection control circuit, if the output current is larger than the standard value of the overcurrent protection group, the overcurrent protection control circuit sends a turn-off control signal to the power path on-off and surge suppression circuit, and the power path is turned off to carry out power protection turn-off.
The output voltage of the input voltage and current sampling circuit is judged through the overvoltage and undervoltage protection control circuit, and if the output voltage is larger than the overvoltage protection reference value or smaller than the undervoltage protection reference value, the overvoltage and undervoltage protection control circuit sends a turn-off control signal to the voltage-stabilizing current-limiting control circuit, and the power path is disconnected to carry out power protection turn-off.
The constant voltage range of the isolated drive control circuit output outwards is 0-320V.
The overvoltage protection reference value and the undervoltage protection reference value are determined according to the range of +/-20% of the input voltage.
Compared with the prior art, the invention has the advantages that:
(1) the high-power Hall electric thruster-based anode power supply provided by the invention has the advantages that the anti-interference and electromagnetic compatibility effects are achieved through the input and output filter circuit form and parameter design, the effects of meeting the voltage, power output and dynamic characteristic requirements are achieved through the power conversion circuit and the control method design, the fault diagnosis and isolation effects are achieved through the protection circuit design, the high-power Hall electric thruster-based anode power supply has the advantages of high output voltage, wide output voltage range, instantaneous high voltage or large current impact resistance, good electromagnetic compatibility, stable output voltage and good dynamic regulation characteristic.
(2) The invention adopts a reasonable power conversion circuit and a voltage stabilizing/current limiting double closed-loop control system, achieves the effects of wide-range voltage output, good dynamic characteristic, high system stability and high reliability, fully utilizes various circuit functions, optimizes the circuit structure, reduces the repetitive design of the circuit, reduces the cost and improves the circuit safety.
Drawings
FIG. 1 is a schematic diagram of an anode power supply circuit according to the present invention;
FIG. 2 is a graph of the output dynamic V-I characteristics of the anode power supply provided by the present invention;
Detailed Description
The utility model provides an anti-interference, shock-resistant, the excellent function of electromagnetic compatibility is realized to hall electric propulsor's positive pole power based on high power through the filter circuit design of input, output current meter voltage, and positive pole power includes following circuit structure respectively: the power supply comprises an input voltage and current sampling circuit, a power path on-off and surge suppression circuit, an input EMI filter circuit, a power conversion circuit, an output filter and output voltage and current sampling circuit, an output isolation circuit, an isolation type drive control circuit, a voltage stabilization current limiting control circuit, an overcurrent protection control circuit and an overvoltage and undervoltage protection control circuit.
In the anode power supply circuit structure, an input voltage and current sampling circuit collects input current and transmits the input current to a power path on-off and surge suppression circuit to control the power path on-off and surge suppression circuit, meanwhile, the output current of the input voltage and current sampling circuit is judged by an overcurrent protection control circuit, if the output current is greater than an overcurrent protection standard value, the overcurrent protection control circuit sends a turn-off control signal to the power path on-off and surge suppression circuit to turn off the power path to perform power supply protection and turn-off, and the overcurrent protection standard value of the overcurrent protection control circuit is determined jointly according to the current carrying capacity of a power device in an anode power supply and the power supply capacity of input power supply equipment;
the power path on-off and surge suppression circuit receives an external control instruction to control the power path to be switched on or switched off, when the external control instruction requires to ensure the power path, output current to the input EMI filter circuit is output, meanwhile, the surge suppression circuit realizes the anti-surge function when the power path is switched on, the power circuit structure can be protected, the input EMI filter circuit is used for realizing the differential mode and common mode filtering processing function, the input EMI filter circuit transmits the processed current to the power conversion circuit, the current required by the external Hall electric thruster of the power conversion circuit is output and converted after being filtered by the output filtering and output voltage current sampling circuit, and then is output to the output isolation circuit, the output isolation circuit outputs current to the external Hall electric thruster and is isolated from other external power supply output currents, wherein:
the output filtering and output voltage current sampling circuit outputs current, an EA control signal is generated through the voltage-stabilizing current-limiting control circuit, and the isolated drive control circuit and the power conversion circuit output constant current to the output isolation circuit according to the EA control signal.
Meanwhile, the input voltage and current sampling circuit collects input voltage and transmits the input voltage to the power path on-off and surge suppression circuit to control the power path on-off and surge suppression circuit, meanwhile, the output voltage of the input voltage and current sampling circuit is judged through the overvoltage and undervoltage protection control circuit, if the output voltage is larger than an overvoltage protection reference value or smaller than an undervoltage protection reference value, the overvoltage and undervoltage protection control circuit sends a turn-off control signal to the voltage stabilization current-limiting control circuit to turn off the power path to perform power protection and turn-off, and the overvoltage protection reference value and the undervoltage protection reference value are determined according to the range of +/-20% of the input voltage;
the power path on-off and surge suppression circuit receives an external control instruction to control the power path to be switched on or switched off, when the external control instruction requires to ensure the power path, output voltage to the input EMI filter circuit, meanwhile, the surge suppression circuit realizes the anti-surge function when the power path is switched on, the power circuit structure can be protected, the input EMI filter circuit is used for realizing the differential mode and common mode filtering processing function, the input EMI filter circuit transmits the processed voltage to the power conversion circuit, the voltage required by the external Hall electric thruster of the power conversion circuit is output and converted and is filtered by the output filtering and output voltage current sampling circuit and then output to the output isolation circuit, the output isolation circuit outputs voltage to the external Hall electric thruster and is isolated from other external power supply output voltages, wherein:
the output filtering and output voltage current sampling circuit outputs voltage, an EA control signal is generated through the voltage-stabilizing current-limiting control circuit, the isolated drive control circuit and the power conversion circuit output constant voltage to the output isolation circuit according to the EA control signal, and the constant voltage output by the isolated drive control circuit ranges from 0V to 320V;
in addition, when the output voltage of the input voltage and current sampling circuit is determined to be within the protection range, the overvoltage and undervoltage protection control circuit controls the voltage stabilization and current limitation control circuit according to the output voltage.
The following is further illustrated with reference to specific examples:
in this embodiment, the anode power circuit structure includes an input voltage current sampling circuit, a power path on-off and surge suppression circuit, an input EMI filter circuit, a power conversion circuit, an output filter and output voltage current sampling circuit, and an output isolation circuit, and the isolated drive control circuit and the voltage stabilization current limiting control circuit are used to implement the double closed-loop control of voltage stabilization and current limitation, and at the same time, the output current and voltage of the input voltage current sampling circuit are respectively determined by the overvoltage and undervoltage protection control circuit and the overcurrent protection control circuit, and are protected by turning off when necessary.
As shown in fig. 1, a power input Vin is output through an input voltage and current sampling circuit and connected to a power path on-off and surge suppression circuit, and an output current or voltage respectively passes through the input voltage and current sampling circuit and an overcurrent protection control circuit or an overvoltage and undervoltage protection control circuit, and generates a control signal according to the magnitude of the current or voltage to determine whether the path needs to be turned off.
The current or voltage output by the input voltage and current sampling circuit enters the input EMI filter circuit to realize the differential mode and common mode filtering processing functions through the power path on-off and surge suppression circuit to realize the power protection function; the output end of the input EMI filter circuit is connected with the power conversion circuit to realize the generation of the power required by the Hall electric thruster, the power conversion circuit outputs corresponding current or voltage to the output isolation circuit after the filtering processing of the output filter and the output voltage current sampling circuit, meanwhile, the output is carried out to the voltage-stabilizing current-limiting control circuit and an EA control signal is generated, the isolated drive control circuit and the power conversion circuit output constant voltage or constant current outwards according to the EA control signal, and then the voltage and the current which are isolated from other external power supplies are output to the output isolation circuit through the power conversion circuit, the output filter and the output voltage and current sampling circuit, as shown in FIG. 2, the output dynamic V-I of the anode power supply is shown, the constant voltage range of the output is 0-320V, meanwhile, through double closed-loop control of output voltage and current feedback, the anode power supply can be ensured to have good dynamic characteristics and stability.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (6)
1. The utility model provides a hall electric propulsor's positive pole power based on high power which characterized in that: including input voltage current sampling circuit, power access break-make and surge suppression circuit, input EMI filter circuit, power conversion circuit, output filter and output voltage current sampling circuit, output buffer circuit, wherein:
the input voltage and current sampling circuit collects input current and transmits the input current to the power path on-off and surge suppression circuit, the power path on-off and surge suppression circuit receives an external control instruction to control the power path to be switched on or switched off, output current of the input EMI filter circuit is prevented from surging when the power path is switched on, the input EMI filter circuit carries out differential mode and common mode filtering processing on the input current and transmits current to the power conversion circuit when the power path is switched on, the power conversion circuit converts the input current according to power required by the external Hall electric thruster and outputs the converted input current to the output isolation circuit after the filtered processing by the output filtering and output voltage and current sampling circuit, and the output isolation circuit outputs current to the external Hall electric thruster and isolates the output current from other external power supplies;
the input voltage and current sampling circuit collects input voltage and transmits the input voltage to the power path on-off and surge suppression circuit, the power path on-off and surge suppression circuit receives an external control instruction to control the power path to be switched on or switched off, output voltage of the input EMI filter circuit is prevented from surging when the power path is switched on, the input EMI filter circuit carries out differential mode and common mode filtering processing on the input voltage and transmits the voltage to the power conversion circuit when the power path is switched on, the power conversion circuit converts the input voltage according to power required by the external Hall electric thruster and outputs the converted input voltage to the output isolation circuit after the filtered processing of the output filtering and output voltage and current sampling circuit, and the output isolation circuit outputs the voltage to the external Hall electric thruster and is isolated from output voltages of other external power supplies.
2. The anode power supply of the high-power Hall electric thruster is characterized in that: the output filtering and output voltage and current sampling circuit outputs current or voltage, an EA control signal is generated by the voltage stabilizing and current limiting control circuit, and the isolated drive control circuit and the power conversion circuit output constant voltage or constant current to the output isolation circuit according to the EA control signal.
3. The anode power supply of the high-power Hall electric thruster is characterized in that: the output current of the input voltage and current sampling circuit is judged through the overcurrent protection control circuit, if the output current is larger than the standard value of the overcurrent protection group, the overcurrent protection control circuit sends a turn-off control signal to the power path on-off and surge suppression circuit, and the power path is turned off to carry out power protection turn-off.
4. The anode power supply of the high-power Hall electric thruster is characterized in that: the output voltage of the input voltage and current sampling circuit is judged through the overvoltage and undervoltage protection control circuit, and if the output voltage is larger than the overvoltage protection reference value or smaller than the undervoltage protection reference value, the overvoltage and undervoltage protection control circuit sends a turn-off control signal to the voltage-stabilizing current-limiting control circuit, and the power path is disconnected to carry out power protection turn-off.
5. The anode power supply of the high-power Hall electric thruster is characterized in that: the constant voltage range of the isolated drive control circuit output outwards is 0-320V.
6. The anode power supply of the high-power Hall electric thruster is characterized in that: the overvoltage protection reference value and the undervoltage protection reference value are determined according to the range of +/-20% of the input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010339923.5A CN111541363A (en) | 2020-04-26 | 2020-04-26 | High-power-based anode power supply of Hall electric thruster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010339923.5A CN111541363A (en) | 2020-04-26 | 2020-04-26 | High-power-based anode power supply of Hall electric thruster |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111541363A true CN111541363A (en) | 2020-08-14 |
Family
ID=71970224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010339923.5A Pending CN111541363A (en) | 2020-04-26 | 2020-04-26 | High-power-based anode power supply of Hall electric thruster |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111541363A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557727A (en) * | 2020-12-15 | 2021-03-26 | 中国空间技术研究院 | Current acquisition circuit suitable for space electric propulsion power supply system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006136057A (en) * | 2004-11-02 | 2006-05-25 | Mitsubishi Electric Corp | Power supply device |
| CN108521228A (en) * | 2018-04-26 | 2018-09-11 | 湖北三江航天万峰科技发展有限公司 | Vehicle power supply universal controller and method |
| CN110535347A (en) * | 2019-07-31 | 2019-12-03 | 北京精密机电控制设备研究所 | A kind of space electric propulsion high-voltage pulse accumulation power supply circuit |
-
2020
- 2020-04-26 CN CN202010339923.5A patent/CN111541363A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006136057A (en) * | 2004-11-02 | 2006-05-25 | Mitsubishi Electric Corp | Power supply device |
| CN108521228A (en) * | 2018-04-26 | 2018-09-11 | 湖北三江航天万峰科技发展有限公司 | Vehicle power supply universal controller and method |
| CN110535347A (en) * | 2019-07-31 | 2019-12-03 | 北京精密机电控制设备研究所 | A kind of space electric propulsion high-voltage pulse accumulation power supply circuit |
Non-Patent Citations (1)
| Title |
|---|
| 孙磊: "稳态等离子体推力器阳极放电电源", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557727A (en) * | 2020-12-15 | 2021-03-26 | 中国空间技术研究院 | Current acquisition circuit suitable for space electric propulsion power supply system |
| CN112557727B (en) * | 2020-12-15 | 2023-05-12 | 中国空间技术研究院 | Current acquisition circuit suitable for space electric propulsion power supply system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2023077929A1 (en) | Modular power supply output protection circuit | |
| CN105226946A (en) | A kind of overvoltage/undervoltage surge control circuit | |
| CN111541363A (en) | High-power-based anode power supply of Hall electric thruster | |
| CN110277769A (en) | LLC power input excess voltage protection and over-voltage protection method | |
| CN103595093A (en) | Solar storage battery discharging device | |
| CN103812402A (en) | Stepless speed regulation device for controlling direct-current motor for aviation industry | |
| CN109194214A (en) | A kind of three-level synchronous generator transient overvoltage suppression circuit and its implementation | |
| CN203553906U (en) | Protection circuit for input voltage of switch power supply | |
| CN103715748A (en) | Lithium battery charging circuit | |
| CN109412421A (en) | A kind of parallel operation circuit | |
| CN109449880A (en) | A kind of high-power aerospace modular power source input undervoltage protection circuit | |
| CN214205335U (en) | Voltage adjusting circuit of switching power supply and power supply system | |
| CN104242421A (en) | Railway vehicle charger system and railway vehicle | |
| CN108809282B (en) | Direct current switch circuit | |
| CN203911835U (en) | Stringing type motor vehicle-used frequency converter | |
| CN219041657U (en) | Excitation dual-power supply circuit | |
| CN111277154A (en) | Integrated non-similar redundant rectifying device | |
| CN213027797U (en) | Solid-state power relay based on hybrid integrated circuit | |
| CN216530517U (en) | Multiple power protection system of hoist | |
| CN210985644U (en) | Motor overvoltage protection circuit and motor | |
| CN215682171U (en) | Rapid de-excitation circuit of aero-generator | |
| CN220585171U (en) | Circuit structure of leakage circuit breaker | |
| CN210985643U (en) | Motor overvoltage protection circuit and motor | |
| CN203456895U (en) | Battery and control circuit thereof | |
| CN217741302U (en) | Leading excessive pressure of switching power supply and undervoltage protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200814 |