CN206850409U - A kind of power supply adaptor of band overvoltage overheat protector - Google Patents
A kind of power supply adaptor of band overvoltage overheat protector Download PDFInfo
- Publication number
- CN206850409U CN206850409U CN201720289920.9U CN201720289920U CN206850409U CN 206850409 U CN206850409 U CN 206850409U CN 201720289920 U CN201720289920 U CN 201720289920U CN 206850409 U CN206850409 U CN 206850409U
- Authority
- CN
- China
- Prior art keywords
- module
- input
- power supply
- supply adaptor
- overheat protector
- 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.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a kind of power supply adaptor of band overvoltage overheat protector, including：Input overvoltage protective module, overheat protector module, rectification filtering module, primary transform module, afterflow rectification filtering module, voltage feedback module, PWM control modules；The input overvoltage protective module carries out voltage clamping when circuit input is over-pressed；The overheat protector module is tightly fastened with input overvoltage protective module and is connected, and ac power supply circuit is cut off when input overvoltage protective module temperature is too high.The utility model can avoid surge voltage and fault excess temperature from causing to damage to voltage adapter and terminal device, ensure that the safe and reliable of power supply adaptor, reduce potential potential safety hazard；Circuit design is simple, practical.
Description
Technical field
It the utility model is related to power technique fields, more particularly to a kind of power supply adaptor of band overvoltage overheat protector.
Background technology
Consumer power supply adaptor as AC-DC, forceful electric power-light current conversion equipment, it is necessary to which to adapt to various complexity harsh
Working environment and the impact for bearing the various incorrect energies beyond specified design specification scope, at the same need to provide stable output with
Ensure the use demand of rear class terminal device；So for power supply adaptor qualitative reliability be always the research of each power supply factory and
The important topic of lifting.
And because the start and stop of powerful device, line fault, switching action and frequency conversion are set inside utility grid electric power system
The reasons such as standby operation, internal surge can be all brought, one can be produced in the case that some high-power electric appliance disconnects suddenly
Very big instantaneous voltage, the terminal device of voltage adapter and its rear end is caused damage, and during fault overtension, electricity
Component such as resistance in road etc. can convert electric energy to heat energy heating heating burnout circuit.
Utility model content
The purpose of this utility model is in view of the above-mentioned drawbacks of the prior art, providing a kind of band overvoltage overheat protector
Power supply adaptor.
The power supply adaptor of band overvoltage overheat protector provided by the utility model includes：Input overvoltage protective module, excess temperature
Protection module, rectification filtering module, primary transform module, afterflow rectification filtering module, voltage feedback module, PWM control modules.
External ac power source is exported to rectification filtering module, rectification by overheat protector module and input overvoltage protective module
For filtration module by convert alternating current to be conveyed to primary transform module after direct current, primary transform module will be defeated after DC power conversion amplitude
Give afterflow rectification filtering module, exported after afterflow rectification filtering module rectifying and wave-filtering to terminal device；The Voltage Feedback
Module gathers the output voltage of afterflow rectification filtering module, and feeds back to PWM control modules, PWM control modules control primary transform
Module carries out voltage transformation；
The input overvoltage protective module uses piezo-resistance MOV1, and voltage clamping is carried out when circuit input is over-pressed；
The overheat protector module uses Thermal Cutoffs RF1, is tightly fastened and is connected with input overvoltage protective module, defeated
Enter overvoltage protective module temperature it is too high when cut off ac power supply circuit.
The power supply adaptor also includes the EMI filtering being serially connected between input overvoltage protective module and rectification filtering module
Module, for by low frequency signal, suppressing high-frequency interferencing signal.
The power supply adaptor also includes input overcurrent protection module, is series at external communication electrical input and the input
Between overvoltage protective module, for when input current is excessive, protection power source adapter not to be burned out.
The input overcurrent protection module is connected on the live wire of input AC electricity, and overheat protector module is connected on input AC electricity
Zero line on, input overvoltage protective module simultaneously with input overcurrent protection module and overheat protector module be directly connected to.
The overheat protector module is serially connected in after the live wire input overcurrent protection module of input AC electricity, is inputted overvoltage and is protected
Shield module is connected between zero line and the overheat protector module of input AC electricity.
The overheat protector module is connected on input AC electricity again input excessively stream after being concatenated with input overvoltage protective module is protected
Between live wire and zero line after shield module.
The rectification filtering module includes rectifier bridge BD1 and transformer LF1 and is connected between rectifier bridge input/output terminal
Electrochemical capacitor C1；
The EMI filtration modules include the common mode inductance LF1 and and common mode inductance being connected with rectification filtering module output end
The electrochemical capacitor C2 of LF1 other ends connection；
The primary transform module is included by transformer T1, and the diode D7 with transformer T1 primary windings connected in series；
The afterflow rectification filtering module is connected by transformer T1 the first secondary coil with afterflow rectification filtering module,
Including the diode D3 and the electric capacity C13 in parallel with diode D3, resistance R13 being connected with first secondary coil one end, diode
Electrochemical capacitor C5, C6, resistance R14 and electric capacity C14 are parallel between the other end of D3 negative pole and the first secondary coil；
The PWM control modules are connected by transformer T1 second subprime coil with primary transform module, including PWM controls
Coremaking piece IC1, pwm chip IC1 power pins VCC are connected to EMI filtration modules by resistance R4, R5 of two series connection
Output end, while pass through the electric capacity C8 of series connection ground connection；External circuit compensation pin COMP is grounded by electric capacity C9；Feedback pin
FB is connected by resistance R7, the R6 and diode D2 being sequentially connected in series with power pins VCC, and is grounded by electric capacity C10, wherein,
Diode D2 negative pole connecting pin VCC, one end of connecting line and transformer T1 second subprime coil between resistance R6, R7 connect
Connect, the other end ground connection of second subprime coil；Pin CS is grounded by resistance R10, R11 of parallel connection；Drain pin DRAIN and primary transform
The diode D7 of module positive pole connection.
The input overcurrent protection module uses current insurance silk F1.
Compared with prior art, the utility model is protected by rational circuit design to the excessively gentle overvoltage of power supply adaptor
Shield, when external ac power source produce voltage surge or due to fault makes circuit temperature too high when, can pass through input overvoltage protect
Module and the timely disconnecting circuit of overheat protector module are protected, avoids surge voltage and circuit excess temperature to voltage adapter and terminal device
Cause to damage, ensure that the safe and reliable of power supply adaptor, reduce potential potential safety hazard；Circuit design is simple, practicality
By force.
Brief description of the drawings
Fig. 1 is the circuit module schematic diagram of the utility model power supply adaptor；
Fig. 2 is the overheat protector module of the utility model embodiment one and input overvoltage protective module circuit diagram；
Fig. 3 is the overheat protector module of the utility model embodiment two and input overvoltage protective module circuit diagram；
Fig. 4 is the overheat protector module of the utility model embodiment three and input overvoltage protective module circuit diagram；
Fig. 5 is the integrated circuit figure of the utility model power supply adaptor.
Embodiment
Utility model is described in detail with reference to the accompanying drawings and examples.
As shown in figure 1, the power supply adaptor of band overvoltage overheat protector provided by the utility model includes：Input overvoltage protection
Module, overheat protector module, EMI filtration modules, rectification filtering module, primary transform module, afterflow rectification filtering module, voltage are anti-
Present module, PWM control modules.It is serially connected between input overvoltage protective module and rectification filtering module, for being believed by low frequency
Number, suppress high-frequency interferencing signal.
External ac power source is delivered to rectification filtering module, rectification by inputting overvoltage protective module and overheat protector module
Filtration module is conveyed to EMI filtration modules after converting alternating current to direct current, and EMI filtration modules filter out high-frequency interferencing signal,
Make low frequency useful signal by being conveyed to primary transform module, it is whole that primary transform module will be conveyed to afterflow after DC power conversion amplitude
Filtration module is flowed, output is to terminal device after afterflow rectification filtering module rectifying and wave-filtering, to power terminal equipment.
The output voltage of the voltage feedback module collection afterflow rectification filtering module, feeds back to PWM control modules, PWM
Control module control primary transform module carries out voltage transformation.When voltage feedback module gathers and feeds back to PWM control module voltages
When too high, PWM control modules control primary transform module from service, i.e., power supply adaptor stop output voltage to power adaptation
The power terminal equipment of device electrical connection, when the feedback voltage that PWM control modules receive recovers in normal range (NR), control primary transform
Module recovery is worked, and terminal device is restored electricity.
In the utility model, external ac power source uses electric main, and over-voltage protection module uses a piezo-resistance
MOV1, piezo-resistance MOV1 are accessed between the live wire and zero line of electric main.Due to big work(inside utility grid electric power system
The reasons such as start and stop, line fault, switching action and the operation of frequency conversion equipment of rate equipment, can all bring internal surge, when some
High-power electric appliance can produce a very big instantaneous voltage in the case of disconnecting suddenly, and now piezo-resistance can be directed to this electricity
Pressure carries out voltage clamping, plays a part of overvoltage protection, so as to ensure the safety of late-class circuit.
Because of circuit using piezo-resistance as over-voltage protector, and piezo-resistance is because of itself working environment and characteristic,
Easily cause ageing failure and transient overvoltage damage inactivation.Because bearing high voltage and energy between the silver strip of the two poles of the earth after its general failure
Impact, it will usually failure open circuit or direct short-circuit.And piezo-resistance is also to belong to lossy device in itself, electric main produces
During surge, the logical impact of lasting wave can cause the isolated material inside piezo-resistance between two silver strips constantly to melt, piezo-resistance body
Low-resistance linearisation progressively aggravate, the pernicious increase of leakage current and concentrate flow into weak spot, weak spot material melts, formed low resistance
Short circuit hole after, formed half short-circuit failure.And because the presence of resistance, if piezo-resistance continues to connect in circuit, power supply is held
Continuous to promote a larger electric current to pour into short dot, resistance converts electric energy to heat energy, causes external circuit plate so as to form high temperature
And the apparent phenomenon that plastic shell fusion crust is on fire, cause potential safety hazard.To solve this fusion crust potential safety hazard on fire, this practicality is new
Type increases an overheat protector module in circuit, is connected to herein using a Thermal Cutoffs RF1 on zero line, Thermal Cutoffs
RF1 and piezo-resistance MOV1 body is closely fixed together, and temperature is increased to Thermal Cutoffs after piezo-resistance is damaged
During rated temperature, Thermal Cutoffs fusing, following stage circuit is disconnected from the circuit, avoids it from continuing heating and cause potential safety hazard,
So as to reach the purpose of overheat protector.After now only having professional to tear machine replacing Thermal Cutoffs open and solving temperature anomaly reason
It can repair.
In the utility model, current insurance silk F1 and Thermal Cutoffs RF1 and input overvoltage protective module, i.e. piezo-resistance
MOV1 connected mode has three kinds, specific as follows：
Embodiment one
As shown in Fig. 2 input overcurrent protection module uses current insurance silk F1, it is connected on the live wire of input AC electricity, mistake
Warm protection module uses Thermal Cutoffs RF1, is connected on the zero line of input AC electricity, input overvoltage protective module while and electric current
Fuse F1 and Thermal Cutoffs RF1 are directly connected to.Thermal Cutoffs RF1 and input overvoltage protective module body, i.e., it is pressure-sensitive
Resistance MOV1 is closely fixed together, and it is specified to be increased to Thermal Cutoffs RF1 for temperature after piezo-resistance MOV1 disabling damages
During temperature, Thermal Cutoffs RF1 fusing, circuit disconnects, avoids it from continuing heating and cause potential safety hazard from there.
Embodiment two
As shown in figure 3, Thermal Cutoffs RF1 is serially connected in after the live wire input overcurrent protection module of input AC electricity, it is defeated
Enter after overvoltage protective module is connected on overheat protector module, wherein, Thermal Cutoffs RF1 is closely fixed on piezo-resistance MOV1
Together, temperature is increased to the specified temperature of Thermal Cutoffs RF1 after inputting overvoltage protective module and being piezo-resistance MOV1 disabling damages
When spending, Thermal Cutoffs RF1 fusing.
Embodiment three
As shown in figure 4, Thermal Cutoffs RF1 is connected on the electric current of input AC electricity again after being concatenated with input piezo-resistance MOV1
Between live wire and zero line after fuse F1, wherein, Thermal Cutoffs RF1 and piezo-resistance MOV1 is closely fixed on one
Rise, when temperature is increased to Thermal Cutoffs RF1 rated temperatures after piezo-resistance MOV1 disabling damages, Thermal Cutoffs RF1 melts
Disconnected, now only piezo-resistance MOV1 is disconnected from the circuit, and is avoided piezo-resistance MOV1 from continuing heating and is caused potential safety hazard.It is such a
The benefit of embodiment is that power supply adaptor can be continuing with after piezo-resistance MOV1 is disconnected, and avoids user because of power adaptation
Device problem is changed too late and rear class equipment can not use.
The utility model is further described with reference to physical circuit, as shown in figure 5, current insurance silk F1 and temperature
Fuse RF1 and input overvoltage protective module are spent, i.e., piezo-resistance MOV1 connected mode is by the way of embodiment one.
Current insurance silk F1 is serially connected on the live wire of alternating current, and Thermal Cutoffs RF1 is serially connected on the zero line of alternating current, pressure
Quick resistance is serially connected between the live wire and zero line after current insurance silk F1 and Thermal Cutoffs RF1.After piezo-resistance MOV1
Connect a rectification filtering module, including rectifier bridge BD1 and transformer LF1 and the electrolysis that is connected between rectifier bridge input/output terminal
Electric capacity C1, rectification is carried out to alternating current exchange is converted into direct current and carries out filtering process.One is concatenated after current rectifying and wave filtering circuit
EMI filtration modules, the module include the common mode inductance LF1 that is connected with rectification filtering module output end and another with common mode inductance LF1
The electrochemical capacitor C2 of one end connection, processing is filtered to the rectified obtained direct current that handles, interference signal is eliminated, remains with
The direct current signal of effect.The output end of the EMI filtration modules is connected with primary transform module, and primary transform module mainly includes by transformation
Device T1, and the diode D7 with transformer T1 primary windings connected in series, transformer T1 the first secondary coil are filtered with afterflow rectification
Ripple module connects, including the diode D3 and the electric capacity C13 in parallel with diode D3, resistance being connected with first secondary coil one end
Electrochemical capacitor C5, C6, resistance R14 and electric capacity are parallel between the other end of R13, diode D3 negative pole and the first secondary coil
C14, exported after rectifying and wave-filtering processing is carried out to the voltage after primary transform block transforms amplitude to exterior terminal equipment, give its confession
Electricity.Wherein, also include between transformer T1 primary coil with the diode D7 R3 to connect and by resistance R1, R2, electric capacity C7 is simultaneously
Join the RC circuits of composition.
PWM control modules are connected by transformer T1 second subprime coil with primary transform module, and the module includes a PWM
Control chip IC1, pwm chip IC1 power pins VCC are connected to EMI by resistance R4, R5 of two series connection and filter mould
The output end of block, while be grounded by the electric capacity C8 of series connection；External circuit compensation pin COMP is grounded by electric capacity C9；Feedback is drawn
Pin FB is connected by resistance R7, the R6 and diode D2 being sequentially connected in series with power pins VCC, and is grounded by electric capacity C10, its
In, diode D2 negative pole connecting pin VCC, the connecting line and the one of transformer T1 second subprime coil between resistance R6, R7
End connection, the other end ground connection of second subprime coil；Pin CS is grounded by resistance R10, R11 of parallel connection；Drain pin DRAIN and master
The diode D7 of conversion module positive pole connection.Pwm chip IC1 feedback pin FB's obtains primary transform by transformer T1
The feedback voltage of module, when feedback voltage is excessive, primary transform module is controlled to stop work by pin DRAIN output control signals
Make, stop output voltage, no longer to power terminal equipment, protection power source adapter and terminal device.
The utility model, to the excessively gentle overvoltage protection of power supply adaptor, works as external ac power source by rational circuit design
Produce voltage surge or due to when fault makes circuit temperature too high, can be by inputting overvoltage protective module and overheat protector mould
The timely disconnecting circuit of block, avoid surge voltage and circuit excess temperature from causing to damage to voltage adapter and terminal device, ensure that electricity
Source adapter it is safe and reliable, reduce potential potential safety hazard；Circuit design is simple, practical.
Above-described embodiment is merely to illustrate specific embodiment of the present utility model.It should be pointed out that for this area
Those of ordinary skill for, without departing from the concept of the premise utility, some deformations and change can also be made, this
A little deformations and change should all belong to the scope of protection of the utility model.
Claims (8)
- A kind of 1. power supply adaptor of band overvoltage overheat protector, it is characterised in that including：Input overvoltage protective module, excess temperature is protected Protect module, rectification filtering module, primary transform module, afterflow rectification filtering module, voltage feedback module, PWM control modules；External ac power source is exported to rectification filtering module, rectifying and wave-filtering by overheat protector module and input overvoltage protective module By convert alternating current to be conveyed to primary transform module after direct current, primary transform module will be conveyed to module after DC power conversion amplitude Afterflow rectification filtering module, exported after afterflow rectification filtering module rectifying and wave-filtering to terminal device；The voltage feedback module The output voltage of afterflow rectification filtering module is gathered, and feeds back to PWM control modules, PWM control modules control primary transform module Carry out voltage transformation；The input overvoltage protective module uses piezo-resistance MOV1, and voltage clamping is carried out when circuit input is over-pressed；The overheat protector module uses Thermal Cutoffs RF1, is tightly fastened and is connected with input overvoltage protective module, was inputting Pressure protection module temperature cuts off ac power supply circuit when too high.
- 2. power supply adaptor as claimed in claim 1, it is characterised in that the power supply adaptor also includes being serially connected in inputting The EMI filtration modules between protection module and rectification filtering module are pressed, for by low frequency signal, suppressing high-frequency interferencing signal.
- 3. power supply adaptor as claimed in claim 2, it is characterised in that the power supply adaptor also includes input overcurrent protection Module, it is series between external communication electrical input and the input overvoltage protective module, for when input current is excessive, protecting Shield power supply adaptor is not burned out.
- 4. power supply adaptor as claimed in claim 3, it is characterised in that the input overcurrent protection module is connected on input AC On the live wire of electricity, overheat protector module is connected on the zero line of input AC electricity, and input overvoltage protective module is simultaneously with inputting excessively stream Protection module and overheat protector module are directly connected to.
- 5. power supply adaptor as claimed in claim 3, it is characterised in that the overheat protector module is serially connected in input AC electricity Live wire input overcurrent protection module after, input overvoltage protective module be connected on input AC electricity zero line and overheat protector module Between.
- 6. power supply adaptor as claimed in claim 3, it is characterised in that the overheat protector module and input overvoltage protection mould Block concatenation after be connected on again input AC electricity input overcurrent protection module after live wire and zero line between.
- 7. the power supply adaptor as described in claim any one of 3-6, it is characterised in that the rectification filtering module includes rectification The bridge BD1 and transformer LF1 and electrochemical capacitor C1 being connected between rectifier bridge input/output terminal；The EMI filtration modules include the common mode inductance LF1 that is connected with rectification filtering module output end and another with common mode inductance LF1 The electrochemical capacitor C2 of one end connection；The primary transform module is included by transformer T1, and the diode D7 with transformer T1 primary windings connected in series；The afterflow rectification filtering module is connected by transformer T1 the first secondary coil with afterflow rectification filtering module, including The diode D3 and the electric capacity C13 in parallel with diode D3, resistance R13 being connected with first secondary coil one end, diode D3's Electrochemical capacitor C5, C6, resistance R14 and electric capacity C14 are parallel between the other end of negative pole and the first secondary coil；The PWM control modules are connected by transformer T1 second subprime coil with primary transform module, including PWM control cores Piece IC1, pwm chip IC1 power pins VCC are connected to the defeated of EMI filtration modules by resistance R4, R5 of two series connection Go out end, while be grounded by the electric capacity C8 of series connection；External circuit compensation pin COMP is grounded by electric capacity C9；Feedback pin FB leads to Cross resistance R7, R6 for being sequentially connected in series and diode D2 is connected with power pins VCC, and be grounded by electric capacity C10, wherein, two poles Pipe D2 negative pole connecting pin VCC, the connecting line between resistance R6, R7 are connected with one end of transformer T1 second subprime coil, The other end ground connection of second subprime coil；Pin CS is grounded by resistance R10, R11 of parallel connection；The pin DRAIN that drains changes the mold with main transformer The diode D7 of block positive pole connection.
- 8. the power supply adaptor as described in claim any one of 3-6, it is characterised in that the input overcurrent protection module uses Current insurance silk F1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720289920.9U CN206850409U (en) | 2017-03-23 | 2017-03-23 | A kind of power supply adaptor of band overvoltage overheat protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720289920.9U CN206850409U (en) | 2017-03-23 | 2017-03-23 | A kind of power supply adaptor of band overvoltage overheat protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206850409U true CN206850409U (en) | 2018-01-05 |
Family
ID=60791394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720289920.9U Active CN206850409U (en) | 2017-03-23 | 2017-03-23 | A kind of power supply adaptor of band overvoltage overheat protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206850409U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106887826A (en) * | 2017-03-23 | 2017-06-23 | 深圳市福瑞康电子有限公司 | A kind of power supply adaptor with excess temperature and input overvoltage double protection function |
| CN111438905A (en) * | 2020-02-27 | 2020-07-24 | 宁波创元信息科技有限公司 | Temperature control system and method for injection mold |
| CN112737362A (en) * | 2020-12-23 | 2021-04-30 | 北京深思数盾科技股份有限公司 | Power adapter and electronic device |
| CN112838771A (en) * | 2020-04-08 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Instant electric water heater and power circuit thereof |
-
2017
- 2017-03-23 CN CN201720289920.9U patent/CN206850409U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106887826A (en) * | 2017-03-23 | 2017-06-23 | 深圳市福瑞康电子有限公司 | A kind of power supply adaptor with excess temperature and input overvoltage double protection function |
| CN111438905A (en) * | 2020-02-27 | 2020-07-24 | 宁波创元信息科技有限公司 | Temperature control system and method for injection mold |
| CN112838771A (en) * | 2020-04-08 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Instant electric water heater and power circuit thereof |
| CN112737362A (en) * | 2020-12-23 | 2021-04-30 | 北京深思数盾科技股份有限公司 | Power adapter and electronic device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206850409U (en) | A kind of power supply adaptor of band overvoltage overheat protector | |
| CN204205552U (en) | The under-voltage over-voltage detection circuit of a kind of AC | |
| WO2018107591A1 (en) | Sic inverted plasma cutting power supply | |
| CN102170178B (en) | High-voltage transmission line current coupling electricity-getting device | |
| CN205070777U (en) | Switching power supply circuit | |
| CN209787042U (en) | Switch power supply charging circuit | |
| CN202197094U (en) | Power transmission line intelligent fault monitoring coupling power supply protective device | |
| CN103474965A (en) | Low-cost alternating-current input overvoltage protection circuit and switching power supply | |
| CN104227194B (en) | Electric welding machine and the control system thereof of full voltage input | |
| CN112091369A (en) | Inverter welding machine protection circuit and electric welding machine | |
| CN209881475U (en) | Small-size switching power supply charging circuit | |
| CN208738824U (en) | The overvoltage crowbar of welding machine and its power input | |
| CN104080221B (en) | A kind of LED drive circuit and LED light | |
| CN108336917A (en) | A kind of switching power circuit | |
| CN203537236U (en) | A digital high frequency high voltage electrostatic dust remover power supply | |
| CN202550694U (en) | CT (current transformer) power taking circuit allowing for reducing heat of CT | |
| CN205464724U (en) | Two voltage automatic switching IGBT contravariant manual metal -arc weldings machine | |
| CN217486370U (en) | Switch power supply circuit for network communication equipment | |
| CN106887826A (en) | A kind of power supply adaptor with excess temperature and input overvoltage double protection function | |
| CN208226890U (en) | A kind of switching power circuit | |
| CN206794992U (en) | A kind of small-sized inversion manual arc welders of single tube IGBT | |
| CN213094086U (en) | Characteristic current generating circuit | |
| CN204992533U (en) | Switching power supply protection circuit, protection device and switching power supply | |
| CN204567528U (en) | North America version parking heating device power supply | |
| CN101212182A (en) | Power circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 518000 New Lake Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN FRECOM ELECTRONICS CO., LTD. Address before: 518000 Shenzhen Guangming New District, Guangdong Province, Fuchuan rich science and Technology Park Patentee before: SHENZHEN FRECOM ELECTRONICS CO., LTD. |
|
| CP02 | Change in the address of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220215 Address after: 423000 No. 18, Jintian Road, bailutang Town, Suxian District, Chenzhou City, Hunan Province Patentee after: Hunan furuikang Electronics Co.,Ltd. Address before: 518000 New Lake Street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN FRECOM ELECTRONICS Co.,Ltd. |
|
| TR01 | Transfer of patent right |