CN106685192A - Power supply circuit of switch system - Google Patents
Power supply circuit of switch system Download PDFInfo
- Publication number
- CN106685192A CN106685192A CN201611097155.7A CN201611097155A CN106685192A CN 106685192 A CN106685192 A CN 106685192A CN 201611097155 A CN201611097155 A CN 201611097155A CN 106685192 A CN106685192 A CN 106685192A
- Authority
- CN
- China
- Prior art keywords
- module
- power supply
- electric capacity
- capacitance
- common mode
- 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
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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The embedment of the invention provides a power supply circuit of a switch system. The power supply circuit comprises a slow start module and a DC-DC module, wherein a power supply source passes through the slow start module and then enters the DC-DC module; the slow start module comprises a first resistor, a second resistor, a first capacitor, a voltage stabilizing tube, an MOS transistor, a third resistor, a fourth resistor and a second capacitor; the first resistor and the first capacitor form a first RC series circuit; the first RC series circuit is connected in front of a source and a grid of the MOS transistor in parallel; voltage applied to the MOS transistor can be controlled by adjusting the values of the first resistor and the first capacitor and control on threshold voltage of the MOS transistor is achieved; and meanwhile, the voltage stabilizing tube is connected with the second resistor in parallel to form a voltage stabilizing circuit. According to the power supply circuit provided by the invention, slow start of the MOS transistor is achieved, slow power-up of high voltage is achieved, the damage of surge current to a board is avoided, meanwhile, the stability of the system is also ensured and protection on a power supply system is achieved.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of power supply circuits of switch system.
Background technology
In the power-supply system for supporting pluggable board, during board insertion main frame, main frame is already at stable work shape
State, all capacitive loads have charged.Board to be inserted is not charged, and the capacitive load on board is uncharged.In heat insertion plate
During card, the electric capacity momentary charge on board to be inserted, charging process will receive substantial amounts of in the moment of insertion from system power supply
Electric current, causes system voltage moment to be fallen, and affects the normal operation of other boards.In the moment of power supply linear contact lay, system power supply
Output resistance and board to be inserted electric capacity composition RC charge tunnels, due to the output resistance very little of power supply, thus surge current
It is very big.During board is extracted, the shunt capacitance electric discharge on board forms a low impedance path and backboard between,
Instantaneous large-current can be produced.
During the present invention is realized, inventor has found at least there is following technical problem in prior art：
The surge current produced during plug-in card can cause to damage to board.
The content of the invention
The power supply circuits of the switch system that the present invention is provided, upper electric controllable-rate, it is to avoid surge current is to board
Damage, realize the protection to board device.
In a first aspect, the present invention provides a kind of power supply circuits of switch system, including：Delay startup module and DC-DC moulds
Block, enters the DC-DC module, wherein the delay startup module includes after power supply delay startup module described in：First is electric
Resistance, second resistance, the first electric capacity, stabilivolt, metal-oxide-semiconductor, 3rd resistor, the 4th resistance and the second electric capacity, wherein,
The first resistor and the second resistance series connection in power supply both sides, wherein the first resistor and power supply
Positive source connects, and the second resistance is connected with power supply negative pole, and at the second resistance two ends described first is parallel with
Electric capacity and the stabilivolt, the positive pole of the stabilivolt is connected with the negative pole of first electric capacity；
The 3rd resistor is connected between the positive pole of the grid of the metal-oxide-semiconductor and first electric capacity；
The source electrode of the metal-oxide-semiconductor is connected with the negative pole of first electric capacity；
The drain electrode of the metal-oxide-semiconductor is connected with the input negative pole of DC-DC module, the input positive pole of the DC-DC module and institute
State the connection of power supply positive pole；
4th resistance and the second capacitances in series are connected between the drain electrode of the metal-oxide-semiconductor and source electrode.
Alternatively, first electric capacity is electrochemical capacitor.
Alternatively, the circuit also includes：Overcurrent-overvoltage module, overcurrent-overvoltage module described in the power supply Jing is laggard
Enter the delay startup module, the overcurrent-overvoltage module includes electric fuse, TVS pipe and varistor, one end of the electric fuse
Be connected with the power supply negative pole, the circuit that the other end is composed in parallel by the TVS pipe and the varistor with it is described
Power supply positive pole connects.
Alternatively, the circuit also includes：Filtration module, the filtration module is located at the delay startup module and DC-DC
Between module, including an X electric capacity, the 2nd X electric capacity, the first Y capacitance, the second Y capacitance, the 3rd Y capacitance, the 4th Y capacitance and altogether
Mould choke coil,
An X electric capacity, the first Y capacitance and the second Y capacitance are connected between the input both positive and negative polarity of the common mode choke, wherein
The first X electric capacity is simultaneously connected between the input both positive and negative polarity of the common mode choke, and first Y capacitance is connected on the common mode
Between the input positive pole of choke coil and ground, second Y capacitance is connected between the input negative pole of the common mode choke and ground, institute
The input positive pole for stating common mode choke is connected with the power supply positive pole, the input negative pole of the common mode choke with it is described
The drain electrode of metal-oxide-semiconductor is connected；
The 2nd X electric capacity, the 3rd Y capacitance and the 4th Y capacitance are connected between the output both positive and negative polarity of the common mode choke, wherein
The 2nd X electric capacity is simultaneously connected between the output both positive and negative polarity of the common mode choke, and the 3rd Y capacitance is connected on the common mode
Between the output cathode and ground of choke coil, the 4th Y capacitance is connected between the output negative pole of the common mode choke and ground, institute
The output both positive and negative polarity for stating common mode choke is connected respectively with the input both positive and negative polarity of the DC-DC module.
The power supply circuits of switch system provided in an embodiment of the present invention, including delay startup module and DC-DC module, power supply
The DC-DC module is entered after power supply delay startup module described in, wherein the delay startup module includes：First resistor, second
Resistance, the first electric capacity, stabilivolt, metal-oxide-semiconductor, 3rd resistor, the 4th resistance and the second electric capacity, wherein first resistor and the first electric capacity
A RC series circuits are constituted, a RC series circuits are connected in parallel on before the source electrode of the metal-oxide-semiconductor and grid, by adjusting
The value for saving the first resistor and first electric capacity can control the voltage being added on the metal-oxide-semiconductor, realize to the MOS
The control of pipe cut-in voltage, while defining mu balanced circuit by the stabilivolt and the second resistance parallel connection.The present invention is provided
Power supply circuits, realize the slow unlatching to metal-oxide-semiconductor, and realize to high-tension slow upper electricity, it is to avoid surge current is to plate
The damage of card, while also ensure that the stability of system, realizes the protection to power-supply system.
Description of the drawings
Fig. 1 is the power supply circuits schematic diagram of one embodiment of the invention switch system；
Fig. 2 is the power supply circuit of another embodiment of the present invention switch system；
Fig. 3 is the power supply circuit of further embodiment of this invention switch system.
Specific embodiment
To make purpose, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
Only it is a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
The present invention provides a kind of power supply circuits of switch system, as shown in figure 1, the circuit includes：Delay startup module
And DC-DC module, the DC-DC module is entered after power supply delay startup module described in, specifically, as shown in Fig. 2 described
Delay startup module includes：First resistor R2, second resistance R3, the first electric capacity C1, stabilivolt D2, metal-oxide-semiconductor, 3rd resistor R4,
Four resistance R5 and the second electric capacity C2, wherein,
First resistor R2 with the second resistance R3 series connection in power supply both sides, wherein first resistor R2
It is connected with power supply positive pole, second resistance R3 is connected with power supply negative pole, it is in parallel at the second resistance R3 two ends
Have the first electric capacity C1 and stabilivolt D2, the first electric capacity C1 is electrochemical capacitor, the positive pole of the stabilivolt D2 with
The negative pole of the first electric capacity C1 is connected；
3rd resistor R4 is connected between the positive pole of the grid of the metal-oxide-semiconductor and the first electric capacity C1；
The source electrode of the metal-oxide-semiconductor is connected with the negative pole of the first electric capacity C1；
The drain electrode of the metal-oxide-semiconductor is connected with the input negative pole of DC-DC module, the input positive pole of the DC-DC module and institute
State the connection of power supply positive pole；
The 4th resistance R5 and the second electric capacity C2 series connections are between the drain electrode of the metal-oxide-semiconductor and source electrode；
The stabilivolt D2 and second resistance R3 have composed in parallel mu balanced circuit, first resistor R2 and described
One electric capacity C1 constitutes a RC series circuits, and the mu balanced circuit ensure that the stability of system, and described by adjusting
The value of first resistor and first electric capacity can control the voltage being added on the metal-oxide-semiconductor, realizes and the metal-oxide-semiconductor is opened
The control of voltage, so as to reduce the value of surge current, and farthest reduce that warm swap brings to board it is negative
Affect.
Specifically, the present invention is realized the voltage of switch system 48V using DC-DC module PKB4113CPI of Ericsson
The 12V voltages of system needs are changed into, is used for late-class circuit.
The power supply circuits of switch system provided in an embodiment of the present invention, including delay startup module and DC-DC module, power supply
The DC-DC module is entered after power supply delay startup module described in, wherein the delay startup module includes：First resistor, second
Resistance, the first electric capacity, stabilivolt, metal-oxide-semiconductor, 3rd resistor, the 4th resistance and the second electric capacity, wherein first resistor and the first electric capacity
A RC series circuits are constituted, a RC series circuits are connected in parallel on before the source electrode of the metal-oxide-semiconductor and grid, by adjusting
The value for saving the first resistor and first electric capacity can control the voltage being added on the metal-oxide-semiconductor, realize to the MOS
The control of pipe cut-in voltage, while defining mu balanced circuit by the stabilivolt and the second resistance parallel connection.The present invention is provided
Power supply circuits, realize the slow unlatching to metal-oxide-semiconductor, and realize to high-tension slow upper electricity, it is to avoid surge current is to plate
The damage of card, while also ensure that the stability of system, realizes the protection to power-supply system.
Alternatively, as shown in figure 3, the power supply circuits of the switch system also include：Overcurrent-overvoltage module and filtering mould
Block, the overcurrent-overvoltage module is used to protect the circuit from damaging in the case of big voltage or overcurrent, the filtration module
Interference is touched for filtering common mode and difference,
The delay startup module, the overcurrent-overvoltage module bag are entered after power supply overcurrent-overvoltage module described in
Electric fuse F1, TVS pipe D1 and varistor R1 are included, one end of the electric fuse is connected with the power supply negative pole, the other end
The circuit composed in parallel by TVS pipe D1 and the varistor R1 is connected with the power supply positive pole；
The filtration module be located between the delay startup module and DC-DC module, including Schottky diode D3, first
X electric capacity C5, the 2nd X electric capacity C6, the first Y capacitance C3, the second Y capacitance C4, the 3rd Y capacitance C7, the 4th Y capacitance C8 and common mode chokes
Circle L1, wherein the first X electric capacity C5 and the 2nd X electric capacity C6 is electrochemical capacitor, an X electric capacity C5 and the 2nd X electric capacity C6
Positive pole be connected with output cathode respectively at the input positive pole of the common mode choke L1,
An X electric capacity C5, the first Y capacitance C3 and the 2nd Y are connected between the input both positive and negative polarity of the common mode choke L1 electric
Hold C4, wherein the Schottky diode D3 is further connected between the first X electric capacity C5 and the drain electrode of the MOS, in the confession
During electric power cut-off, the Schottky diode D3 is used to prevent the electric energy stored in the common mode choke from pouring in down a chimney back described delaying
Starting module, the positive pole of the Schottky diode D3 is connected with the negative pole of the X electric capacity C5, the X electric capacity C5
And be connected between the input both positive and negative polarity of the common mode choke, first Y capacitance C3 is connected on the defeated of the common mode choke
Enter between positive pole and ground, second Y capacitance C4 is connected between the input negative pole of the common mode choke and ground, and the common mode is gripped
The input positive pole of stream circle L1 is connected with the power supply positive pole, input negative pole and the metal-oxide-semiconductor of the common mode choke L1
Drain electrode be connected；
The 2nd X electric capacity C6, the 3rd Y capacitance C7 and the 4th Y capacitance are connected between the output both positive and negative polarity of the common mode choke
C8, wherein the second X electric capacity C6 and being connected between the output both positive and negative polarity of the common mode choke L1, the 3rd Y capacitance
C7 is connected between the output cathode of the common mode choke L1 and ground, and the 4th Y capacitance C8 is connected on the common mode choke L1
Output negative pole and ground between, the common mode choke L1 output both positive and negative polarity it is positive and negative with the input of the DC-DC module respectively
Extremely it is connected；
The filtration module is by using the X electric capacity, the Y capacitance and the common mode choke, having filtered switch
The interference of system 48V voltage.
Wherein, between the output both positive and negative polarity and the DC-DC module of the common mode choke L1, also it is parallel with the 5th electric capacity
C9 and the 6th electric capacity C10, wherein the 5th electric capacity is electrochemical capacitor C9, the positive pole of the 5th electric capacity C9 is gripped with the common mode
The output cathode of stream circle is connected.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (4)
1. a kind of power supply circuits of switch system, it is characterised in that the circuit includes：Delay startup module and DC-DC module,
The DC-DC module is entered after power supply delay startup module described in, wherein the delay startup module includes：First resistor,
Second resistance, the first electric capacity, stabilivolt, metal-oxide-semiconductor, 3rd resistor, the 4th resistance and the second electric capacity, wherein,
The first resistor with the second resistance series connection in power supply both sides, wherein the first resistor and power supply
Positive pole connects, and the second resistance is connected with power supply negative pole, and at the second resistance two ends first electric capacity is parallel with
And the stabilivolt, the positive pole of the stabilivolt is connected with the negative pole of first electric capacity；
The 3rd resistor is connected between the positive pole of the grid of the metal-oxide-semiconductor and first electric capacity；
The source electrode of the metal-oxide-semiconductor is connected with the negative pole of first electric capacity；
The drain electrode of the metal-oxide-semiconductor is connected with the input negative pole of DC-DC module, input positive pole and the confession of the DC-DC module
Electric positive source connection；
4th resistance and the second capacitances in series are connected between the drain electrode of the metal-oxide-semiconductor and source electrode.
2. circuit according to claim 1, it is characterised in that first electric capacity is electrochemical capacitor.
3. circuit according to claim 1, it is characterised in that the circuit also includes：Overcurrent-overvoltage module, the power supply
After power supply overcurrent-overvoltage module described in enter the delay startup module, the overcurrent-overvoltage module include electric fuse, TVS pipe and
Varistor, one end of the electric fuse is connected with the power supply negative pole, and the other end is by the TVS pipe and described pressure-sensitive
The circuit of resistor coupled in parallel composition is connected with the power supply positive pole.
4. circuit according to claim 1, it is characterised in that the circuit also includes：Filtration module, the filtration module
Between the delay startup module and DC-DC module, including an X electric capacity, the 2nd X electric capacity, the first Y capacitance, the 2nd Y electric
Appearance, the 3rd Y capacitance, the 4th Y capacitance and common mode choke, are connected to an X electric between the input both positive and negative polarity of the common mode choke
Hold, the first Y capacitance and the second Y capacitance, wherein the first X electric capacity and be connected in the common mode choke input both positive and negative polarity it
Between, first Y capacitance is connected between the input positive pole of the common mode choke and ground, and second Y capacitance is connected on described common
Between the input negative pole of mould choke coil and ground, the input positive pole of the common mode choke is connected with the power supply positive pole, institute
The input negative pole for stating common mode choke is connected with the drain electrode of the metal-oxide-semiconductor；
The 2nd X electric capacity, the 3rd Y capacitance and the 4th Y capacitance are connected between the output both positive and negative polarity of the common mode choke, wherein described
2nd X electric capacity is simultaneously connected between the output both positive and negative polarity of the common mode choke, and the 3rd Y capacitance is connected on the common mode chokes
Between the output cathode and ground of circle, the 4th Y capacitance is connected between the output negative pole of the common mode choke and ground, described common
The output both positive and negative polarity of mould choke coil is connected respectively with the input both positive and negative polarity of the DC-DC module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611097155.7A CN106685192A (en) | 2016-12-02 | 2016-12-02 | Power supply circuit of switch system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611097155.7A CN106685192A (en) | 2016-12-02 | 2016-12-02 | Power supply circuit of switch system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106685192A true CN106685192A (en) | 2017-05-17 |
Family
ID=58867302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611097155.7A Pending CN106685192A (en) | 2016-12-02 | 2016-12-02 | Power supply circuit of switch system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106685192A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109842294A (en) * | 2017-11-24 | 2019-06-04 | 力旺电子股份有限公司 | Four-phase charge pump circuit |
| CN113824088A (en) * | 2021-09-29 | 2021-12-21 | 深圳市智微智能科技股份有限公司 | Input power supply protection circuit and device of direct current type POE switch |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1674438A (en) * | 2004-03-23 | 2005-09-28 | 华为技术有限公司 | Circuit for positive power source inputting load electrifying slow starting |
| CN201181903Y (en) * | 2008-04-01 | 2009-01-14 | 中兴通讯股份有限公司 | Input circuit of DC power supply |
| CN202309659U (en) * | 2011-11-17 | 2012-07-04 | 中兴通讯股份有限公司 | Power input load power-on slow starter |
| CN102780390A (en) * | 2012-07-23 | 2012-11-14 | 西安电子科技大学 | Slowly-starting circuit for mine direct current conversion intrinsic safe power supply |
| US20160270169A1 (en) * | 2014-09-29 | 2016-09-15 | Boe Technology Group Co., Ltd. | Led driver and circuit and electronic device |
-
2016
- 2016-12-02 CN CN201611097155.7A patent/CN106685192A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1674438A (en) * | 2004-03-23 | 2005-09-28 | 华为技术有限公司 | Circuit for positive power source inputting load electrifying slow starting |
| CN201181903Y (en) * | 2008-04-01 | 2009-01-14 | 中兴通讯股份有限公司 | Input circuit of DC power supply |
| CN202309659U (en) * | 2011-11-17 | 2012-07-04 | 中兴通讯股份有限公司 | Power input load power-on slow starter |
| CN102780390A (en) * | 2012-07-23 | 2012-11-14 | 西安电子科技大学 | Slowly-starting circuit for mine direct current conversion intrinsic safe power supply |
| US20160270169A1 (en) * | 2014-09-29 | 2016-09-15 | Boe Technology Group Co., Ltd. | Led driver and circuit and electronic device |
Non-Patent Citations (1)
| Title |
|---|
| 赵宪宁，张国海: ""基于MOSFET的负载开关设计与实现"", 《无线电工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109842294A (en) * | 2017-11-24 | 2019-06-04 | 力旺电子股份有限公司 | Four-phase charge pump circuit |
| CN113824088A (en) * | 2021-09-29 | 2021-12-21 | 深圳市智微智能科技股份有限公司 | Input power supply protection circuit and device of direct current type POE switch |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103034608B (en) | Plug-and-play circuit, interface circuit and electronic equipment assembly | |
| CN201699585U (en) | Novel intelligent voltage stabilizing circuit | |
| CN203574534U (en) | Surge current suppressing circuit | |
| CN213367403U (en) | Power input end surge current control circuit | |
| CN106685192A (en) | Power supply circuit of switch system | |
| CN107947557A (en) | A kind of soft starting circuit of anti-over-pressed, under-voltage surge | |
| CN104035538A (en) | Main board protection circuit | |
| CN205195679U (en) | Hardware reset circuit and electronic product | |
| CN201975993U (en) | Adjusting tube type series voltage stabilizing circuit | |
| CN208369280U (en) | A kind of lithium battery protection circuit | |
| CN207037594U (en) | A kind of equipment for realizing Auto Power On | |
| CN103326344B (en) | A kind of overvoltage limiting circuit | |
| CN103034607B (en) | Plug-and-play circuit, interface circuit and electronic equipment assembly | |
| CN210468847U (en) | Battery charging circuit based on DC-DC power supply chip | |
| CN202495882U (en) | Power supply circuit and television | |
| CN209329961U (en) | A kind of power control circuit and electronic equipment | |
| CN204886132U (en) | Prevent voltage pulse circuit | |
| CN203933116U (en) | A kind of charger for mobile phone | |
| CN103490387A (en) | Single-stage PFC fly-back power source input under-voltage protection circuit | |
| CN204131110U (en) | Based on the battery system anti-surge circuit of discrete elements | |
| CN111864713A (en) | Overvoltage protection device for high pitch loudspeaker | |
| CN203466558U (en) | Single-stage PFC flyback power supply input undervoltage protection circuit | |
| CN206947934U (en) | A kind of short-circuit protection circuit and BOOST circuit | |
| CN201523258U (en) | Power supply device of electronic equipment | |
| CN109936194A (en) | A kind of power supply circuit of battery management system |
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 | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170517 |
|
| WD01 | Invention patent application deemed withdrawn after publication |