CN107546989A - A kind of portable built-in direct regulated power supplies of 400W - Google Patents
A kind of portable built-in direct regulated power supplies of 400W Download PDFInfo
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- CN107546989A CN107546989A CN201710898732.0A CN201710898732A CN107546989A CN 107546989 A CN107546989 A CN 107546989A CN 201710898732 A CN201710898732 A CN 201710898732A CN 107546989 A CN107546989 A CN 107546989A
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Abstract
The present invention relates to a kind of portable built-in direct regulated power supplies of 400W, including power supply body, the power supply body uses opens up benefit structure without derided capacitors half-bridge, the power supply body one side is provided with input and output terminal and vent, another side is sequentially provided with regulation potentiometer, cooling fan and power work indicator lamp from top to bottom, and the power work indicator lamp side switchs provided with power work；Pwm chip, power protection chip and accessory power supply plate built in the power supply body；It is an advantage of the invention that, regulated power supply characteristic than originally being manufactured with discrete semiconductor component has obtained very big lifting, output voltage wide scope is adjustable, being embodied in can adjust from 0V, when unloaded between starting voltage about 0.4V~0.6V, during peak power output between power supply output ripple Vp p values about 50mV~200mV, power supply whole efficiency is high, caloric value is small, high power density, small volume, in light weight, is advantageous to oil well logging instrument installation, portable.
Description
Technical field
The present invention relates to switch power technology field, and in particular to a kind of portable built-in direct regulated power supplies of 400W.
Background technology
Apparatus elements need a kind of adjustable power of direct current on well in petroleum logging system, and this regulated power supply requires output
Voltage request is minimum to be adjusted from 0V, maximum output voltage to 200V, output ripple≤200mV, and requires that power volume is small, again
Amount is light.Most of switching mode adjustable power of direct current of domestic supply can not be adjusted from 0V, starting voltage about 10V~30V when unloaded
Between, and during peak power output between power supply output ripple Vp-p values about 1V~3V, volume about long 320mm × wide 260mm bigger than normal
× thick 120mm, weight lay particular stress on about 3.5Kg and are unfavorable for oil well logging instrument installation, portable.It is so necessary by using new skill
Art and scheme research and development a aim at the supporting adjustable power of direct current of petroleum logging system.
Existing to have authorized Chinese patent document CN204425187U to disclose used in oil well logging high temperature power supply, it is mainly solved
The problem of be existing Switching Power Supply operating temperature range generally between -40 DEG C to+85 DEG C, some specific works can not be met
The high temperature application of the industry field such as industry such as oil, steel, that is, be not used in+85 DEG C to+125 DEG C of hot environment, existing electricity
Volume source is big, and efficiency is low, and stability is poor, and reliability is low, can not ensure the stabilization of whole system.Solved the problems, such as not with the present invention
Together.
The content of the invention
Present invention aim to address above mentioned problem, there is provided one kind can be adjusted from 0V, small volume, it is in light weight, be easy to stone
Oily logger installation, portable 400W built in switch type adjustable power of direct current.
To achieve the above object, the present invention provides following technical scheme：
A kind of portable built-in direct regulated power supplies of 400W, including power supply body, the power supply body are used without partial pressure electricity
Hold half-bridge and open up benefit structure, the power supply body one side is provided with input and output terminal and vent, another side from top to bottom according to
Secondary regulation potentiometer, cooling fan and power work indicator lamp, the power work indicator lamp side of being provided with is provided with power work
Switch；
Further, pwm chip, power protection chip and accessory power supply plate built in the power supply body；
Further, the power supply body is provided with three tunnels and exported altogether：First output, the second output and the 3rd output.
Further, it is surface mount elements on the control panel of the pwm chip, and it is defeated installed in first with riser structure
Go out on mainboard；The PWM control panels include PWM Master control chips, primary side current foldback circuit, mu balanced circuit, secondary lateral spacing
Flow protection circuit, output overvoltage protection circuit, thermal-shutdown circuit and working indicating, PWM control panels and first defeated
Go out the electrical connection of mainboard negative pole；
Further, the first output mainboard includes input rectifier DB1, PC1, including without derided capacitors semi-bridge alternation
Circuit, the wide Square wave pulses of high frequency modulation, output rectifier and filter, accessory power supply, primary current sample circuit, secondary current are adopted
Sample circuit, excess temperature sampling resistor, output overvoltage sample circuit, output voltage stabilizing sample circuit；
Further, the accessory power supply plate includes the first inverse-excitation type switch power-supply and the second inverse-excitation type switch power-supply, uses
In offer 12V accessory power supplys and 24V accessory power supplys.
Further, the pwm chip uses SG3525.
Further, the primary side current foldback circuit is made up of main switch Q1 and its periphery, the mu balanced circuit
It is made up of U3A and its periphery, the secondary side current-limiting protection circuit is made up of U3B, U2 and its periphery, the output over-voltage protection
Circuit is made up of U3C and its periphery, and the thermal-shutdown circuit is made up of U3D and its periphery, and the working indicating is by leading
Switching tube Q2, Q3 are formed.
Further, the no derided capacitors semi-bridge alternation circuit is made up of T1, T2, Q1, Q2, C6 circuit, the output
Current rectifying and wave filtering circuit is made up of D5, D6, D7, D8, L1, C16, C17, LF2, C18 circuit, the accessory power supply by U1, T4 and its
Peripheral circuit is formed, and the primary current sample circuit is made up of T3, D13, D14, D15 and D16, the secondary current sampling electricity
It route RS1 to form, the excess temperature sampling resistor is RT1, and the output overvoltage sample circuit is made up of R17~R20, the output
Voltage stabilizing sample circuit is made up of R21~R24；
Further, the regulation potentiometer electrically connects with JK2 connectors, for adjusting DC0-185V output voltages；
Further, the power work indicator lamp and power work switch are electrically connected JK3 connectors, for pair
DC0-185V out-put supplies carry out switching control and working condition instruction.
Further, first inverse-excitation type switch power-supply is exported by U1 single-chip switching power supplies chip and T1 transformers, D5
Diode, C6, C7, C8 output filtering, PC1 isolation optocouplers, U3 sampling feedbacks chip are formed, for being provided to user's control circuit
12V accessory power supplys；Second inverse-excitation type switch power-supply exports two poles by U2 single-chip switching power supplies chip and T1 transformers, D6
Pipe, C9, C10, C11 output filtering, PC2 isolation optocouplers, U4 sampling feedbacks chip are formed, for providing V to user's control circuit
Accessory power supply.
Further, the accessory power supply board component loads in mixture to paste, inserting.
As a preferred technical solution of the present invention, the input rectifier DB1 is pressure-resistant to be more than 600V, continuous work electricity
Stream is more than 5A, and main switch Q1, Q2 peak inrush current is 47A, and pressure-resistant is 600V.
As a preferred technical solution of the present invention, the power supply body input voltage is：AC0V (175V~0V), 50
~60Hz；Operating temperature range is：- 40 DEG C~+70 DEG C.
Export output voltage/electric current：First output be：DC0-185V/2.2A, the second output are：DC12V/0.4A, the 3rd
Export and be：DCV/0.4A；
Output ripple：First output be：≤ 200mV, the second output are：≤ 100mV, the 3rd output are：≤200mV；
Power-efficient：First output be：>=82%, second output be：>=70%, the 3rd output be：>=75%；
Power supply is pressure-resistant：Input-outlet chamber AC1500V, last 1 minute, without flashover, without breakdown；Between input-shell
AC1500V, last 1 minute, without flashover, without breakdown；AC500V between output-shell, last 1 minute, without flashover, without breakdown.
As a preferred technical solution of the present invention, the integrated aluminium shell of power supply body, and the shell
And internal power tube radiator.
As a preferred technical solution of the present invention, the power supply body appearance and size be 173mm × 147mm ×
61mm, weight 1.4Kg, it is small volume, in light weight.
The beneficial effects of the present invention are：
SG3525 of the present invention is a kind of function admirable, multiple functional and versatile single-chip integration PWM controls
Coremaking piece, its simple and reliable and easy to use and flexible, output driving are push-and-pull output form, add driving force；There is excessively stream
Defencive function, frequency-adjustable, while maximum duty cycle can be limited；Regulated power supply than originally being manufactured with discrete semiconductor component is special
Property has obtained very big lifting, and output voltage wide scope is adjustable, is embodied in and can be adjusted from 0V, and starting voltage is about when unloaded
Between 0.4V~0.6V, during peak power output between power supply output ripple Vp-p values about 50mV~200mV, power supply whole efficiency is high,
Caloric value is small, high power density, small volume, in light weight, is advantageous to oil well logging instrument installation, portable.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, it is required in being described below to embodiment to use
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only the present invention in order to illustrate more clearly of this hair
Bright embodiment or technical scheme of the prior art, below by the required accompanying drawing used in embodiment or description of the prior art
It is briefly described, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is the structural front view of the present invention；
Fig. 2 is the structure right view of the present invention；
Fig. 3 is the structure left view of the present invention；
Fig. 4 is the PWM control panel circuit diagrams of the present invention；
Fig. 5 is the first output motherboard circuit figure of the present invention；
Fig. 6 is the accessory power supply plate circuit diagram of the present invention.
Embodiment
A kind of portable built-in direct regulated power supplies of 400W as Figure 1-3, including power supply body 21, the power supply sheet
For body 21 using benefit structure is opened up without derided capacitors half-bridge, the one side of power supply body 21 is provided with input and output terminal 22 and vent
23, another side is sequentially provided with regulation potentiometer 24, cooling fan 25 and power work indicator lamp 26, the power supply from top to bottom
The side of relay indicating light 26 is provided with power work switch 27；Pwm chip, power protection chip built in the power supply body 21
And accessory power supply plate；The power supply body 21 is provided with three tunnels and exported altogether：First output, the second output and the 3rd output.
It is surface mount elements on the control panel of the pwm chip such as Fig. 4, and the first output is arranged on riser structure
On mainboard；The PWM control panels include PWM Master control chips, primary side current foldback circuit, mu balanced circuit, secondary current limiting
Protection circuit, output overvoltage protection circuit, thermal-shutdown circuit and working indicating, the PWM control panels and the first output
Mainboard negative pole electrically connects；The first output mainboard includes input rectifier DB1, PC1, including without derided capacitors semi-bridge alternation electricity
Road, the wide Square wave pulses of high frequency modulation, output rectifier and filter, accessory power supply, primary current sample circuit, secondary current sampling
Circuit, excess temperature sampling resistor, output overvoltage sample circuit, output voltage stabilizing sample circuit；It is anti-that the accessory power supply plate includes first
Excitation type switch power-supply and the second inverse-excitation type switch power-supply, for providing 12V accessory power supplys and 24V accessory power supplys.
Further, the pwm chip uses SG3525.
Further, the primary side current foldback circuit is made up of main switch Q1 and its periphery, the mu balanced circuit
It is made up of U3A and its periphery, the secondary side current-limiting protection circuit is made up of U3B, U2 and its periphery, the output over-voltage protection
Circuit is made up of U3C and its periphery, and the thermal-shutdown circuit is made up of U3D and its periphery, and the working indicating is by leading
Switching tube Q2, Q3 are formed.U1 driving pulse is outwards exported by 1,2 pins, and an excessively stream sampled signal is inputted by 3,4 pins, output
Voltage adjustment signal is inputted by 6 pins, and 5.0V precisions a reference source is outwards exported by 7 pins inside U1, and secondary excessively stream sampled signal is by 8,9
Pin is inputted, and output overvoltage sampled signal is inputted by 10 pins, and output voltage stabilizing sampled signal is inputted by 11 pins, overheat protector sampled signal
Inputted by 13 pins, control panel power supply is inputted by 14,15,16 pins, and control panel external switch o'clock is inputted by 17,18 pins, control panel work
Make signal outwards to be exported by 19 pins, secondary output current protection value setting signal is inputted by 20 pins, and remaining is respectively labeled as GND pin
Pin is that publicly, this is publicly connected with the first negative pole exported.
Such as Fig. 5, from JN1 to C5, part is input EMI, rectification, filter circuit will input AC220V to be transformed to DC310V straight
Flow busbar voltage.T1, T2, Q1, Q2, C6 partial circuit form and are transformed to isolate by DC310V without derided capacitors semi-bridge alternation circuit
The wide Square wave pulses of high frequency modulation of output.D5, D6, D7, D8, L1, C16, C17, LF2, C18 partial circuit form output rectification filter
T1 secondary high frequencies are adjusted wide Square wave pulses to be transformed to DC0-185V DC voltages by wave circuit.U1, T4 and its peripheral circuit are formed
Accessory power supply also carries blower fan power supply to control panel KB2 offers+12V, -5V power supplys, and+12V to power supply.T3, D13~D16
Form primary current sample circuit.RS1 forms secondary current sample circuit.RT1 is excess temperature sampling resistor.R17~R20 forms defeated
Go out over-pressed sample circuit.R21~R24 forms output voltage stabilizing sample circuit.VR1 potentiometers are used to set secondary output current protection
Value.The regulation potentiometer 24 electrically connects with JK2 connectors, for adjusting DC0-185V output voltages；The power work refers to
Show that lamp 26 and power work switch 27 are electrically connected JK3 connectors, for carrying out switch control to DC0-185V out-put supplies
And working condition instruction.
Such as Fig. 6, other component controls electricity consumptions for the convenience of the user, especially in the independently installed one piece of accessory power supply of power source internal
Plate.Power panel power supply through JN1, FUSE1, DB1 input, prevents reversed circuit, after C1 is filtered from DC310V supply terminals on mainboard
To power panel in-line power.
Monolithically integrated switching power supply chip design of the accessory power supply principle based on model VIPER-22.First inverse-excitation type
Switching Power Supply is isolated by U1 single-chip switching power supplies chip with T1 transformers, D5 output diodes, C6, C7, C8 output filtering, PC1
Optocoupler, U3 sampling feedbacks chip are formed, for providing 12V accessory power supplys to user's control circuit；Second flyback switching
Power supply isolates light by U2 single-chip switching power supplies chip with T1 transformers, D6 output diodes, C9, C10, C11 output filtering, PC2
Coupling, U4 sampling feedbacks chip are formed, for providing 24V accessory power supplys to user's control circuit.
Further, the accessory power supply board component loads in mixture to paste, inserting.
As a preferred technical solution of the present invention, the input rectifier DB1 is pressure-resistant to be more than 600V, continuous work electricity
Stream is more than 5A, and main switch Q1, Q2 peak inrush current is 47A, and pressure-resistant is 600V.
As a preferred technical solution of the present invention, the input voltage of power supply body 21 is：AC220V (175V~
240V), 50~60Hz；Operating temperature range is：- 40 DEG C~+70 DEG C.
Export output voltage/electric current：First output be：DC0~185V/2.2A, the second output are：DC12V/0.4A, the
Three output be：DC24V/0.4A；
Output ripple：First output be：≤ 200mV, the second output are：≤ 100mV, the 3rd output are：≤200mV；
Power-efficient：First output be：>=82%, second output be：>=70%, the 3rd output be：>=75%；
Power supply is pressure-resistant：Input-outlet chamber AC1500V, last 1 minute, without flashover, without breakdown；Between input-shell
AC1500V, last 1 minute, without flashover, without breakdown；AC500V between output-shell, last 1 minute, without flashover, without breakdown.
As a preferred technical solution of the present invention, the integrated aluminium shell of power supply body 21, and it is described outer
Shell and internal power tube radiator.
As a preferred technical solution of the present invention, the appearance and size of power supply body 21 be 173mm × 147mm ×
61mm, weight 1.4Kg, it is small volume, in light weight.
The parameter selection of key element：
A) SG3525 working frequencies are set
Formula is f=1/CT (0.7RT+RD), presets CT=2.2nF, RT=10K, RD=100 Ω
By parameter substitution formula calculate f ≈ 64.9KHz, the value meet with pre-designed parameter.
B) input rectifier DB1：
Breakdown reverse voltage：VR≤1.414 × VIN (MAX)=1.414 × 240=339.36V considers power input
There are surge, the possibility of overvoltage, rectifier is pressure-resistant to should be greater than 600V.
Maximum on state current：IR≤Po/VDC (MIN) × η=415/247.45 × 0.8=2.09A considers power supply is defeated
Enter to have surge, the possibility of excessively stream, the continuous operating current of rectifier should be greater than 5A.
Final selected GBU1510 silicon bridge, electric current 15A, pressure-resistant 1000V.
C) input filter capacitor：
Electric capacity is pressure-resistant：VDC=VAC (MAX) × 1.5=240 × 1.5=360V
Capacitance：C=Po × (10 ﹣ 6) (F)=400 × 1=400uf
Finally selected electric capacity is pressure-resistant 400V, capacity 470uF ,+105 DEG C of electrochemical capacitors.
D) main switch Q1, Q2：
Switching tube peak point current：Ipk=2.8Pout/VDC (min)=2.8 × 400/247=4.5A.
Switching tube is pressure-resistant：One of switching tube conducting of half-bridge circuit, another switching tube bear voltage when ending and are
Power DC bus ceiling voltage, Vd-s=VDC (MAX)=340V.
Considering power input has surge, overvoltage, the possibility of excessively stream, and the continuous operating current of switching tube should be greater than 10A, open
Close and manage pressure-resistant >=400V.Finally selected switching tube model SPW47N60C3, parameter be peak inrush current Id (MAX)=47A,
Pressure-resistant=600V, circuit application can be met completely.
SG3525 of the present invention is a kind of function admirable, multiple functional and versatile single-chip integration PWM controls
Coremaking piece, its simple and reliable and easy to use and flexible, output driving are push-and-pull output form, add driving force；There is excessively stream
Defencive function, frequency-adjustable, while maximum duty cycle can be limited；Regulated power supply than originally being manufactured with discrete semiconductor component is special
Property has obtained very big lifting, and output voltage wide scope is adjustable, is embodied in and can be adjusted from 0V, and starting voltage is about when unloaded
Between 0.4V~0.6V, during peak power output between power supply output ripple Vp-p values about 50mV~200mV, power supply whole efficiency is high,
Caloric value is small, high power density, small volume, in light weight, is advantageous to oil well logging instrument installation, portable.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (10)
1. a kind of portable built-in direct regulated power supplies of 400W, including power supply body (21), it is characterised in that the power supply body
(21) benefit structure is opened up using without derided capacitors half-bridge, power supply body (21) one side is provided with input and output terminal (22) and row
Air holes (23), another side are sequentially provided with regulation potentiometer (24), cooling fan (25) and power work indicator lamp from top to bottom
(26), power work indicator lamp (26) side is provided with power work switch (27)；
Pwm chip, power protection chip and accessory power supply plate built in the power supply body (21)；
The power supply body (21) is provided with three tunnels and exported altogether：First output, the second output and the 3rd output.
It is surface mount elements on the control panel of the pwm chip, and is arranged on riser structure on the first output mainboard；It is described
The control panel of pwm chip, which includes PWM Master control chips, primary side current foldback circuit, mu balanced circuit, secondary current limiting, to be protected
Protection circuit, output overvoltage protection circuit, thermal-shutdown circuit and working indicating, the control panel of the pwm chip with
First output mainboard negative pole electrical connection；
The first output mainboard includes input rectifier DB1, PC1, including wide without derided capacitors semi-bridge alternation circuit, high frequency modulation
Square wave pulses, output rectifier and filter, accessory power supply, primary current sample circuit, secondary current sample circuit, excess temperature are adopted
Sample resistance, output overvoltage sample circuit, output voltage stabilizing sample circuit；
The accessory power supply plate includes the first inverse-excitation type switch power-supply and the second inverse-excitation type switch power-supply, for providing 12V auxiliary
Power supply and 24V accessory power supplys.
2. the portable built-in direct regulated power supplies of 400W of one kind according to claim 1, it is characterised in that the PWM controls
Coremaking piece uses SG3525.
3. the portable built-in direct regulated power supplies of 400W of one kind according to claim 1, it is characterised in that the primary side
Current foldback circuit is made up of main switch Q1 and its periphery, and the mu balanced circuit is made up of U3A and its periphery, the secondary side
Current-limiting protection circuit is made up of U3B, U2 and its periphery, and the output overvoltage protection circuit is made up of U3C and its periphery, the mistake
Warm protection circuit is made up of U3D and its periphery, and the working indicating is made up of main switch Q2, Q3.
4. the portable built-in direct regulated power supplies of 400W of one kind according to claim 1, it is characterised in that the no partial pressure
Electric capacity semi-bridge alternation circuit is made up of T1, T2, Q1, Q2, C6 circuit, the output rectifier and filter by D5, D6, D7, D8,
L1, C16, C17, LF2, C18 circuit are formed, and the accessory power supply is made up of U1, T4 and its peripheral circuit, and the primary current is adopted
Sample circuit is made up of T3, D13, D14, D15 and D16, and the secondary current sample circuit is made up of RS1, the excess temperature sampling electricity
Hinder and be made up of for RT1, the output overvoltage sample circuit R17~R20, the output voltage stabilizing sample circuit is by R21~R24 structures
Into；
The regulation potentiometer (24) electrically connects with JK2 connectors, for adjusting DC 0-185V output voltages；
The power work indicator lamp (26) and power work switch (27) are electrically connected JK3 connectors, for DC 0-
185V out-put supplies carry out switching control and working condition instruction.
5. the portable built-in direct regulated power supplies of 400W of one kind according to claim 1, it is characterised in that described first is anti-
Excitation type switch power-supply is by U1 single-chip switching power supplies chip and T1 transformers, D5 output diodes, C6, C7, C8 output filtering, PC1
Isolation optocoupler, U3 sampling feedbacks chip are formed, for providing 12V accessory power supplys to user's control circuit；Second inverse-excitation type
Switching Power Supply by U2 single-chip switching power supplies chip and T1 transformers, D6 output diodes, C9, C10, C11 output filtering, PC2 every
Formed from optocoupler, U4 sampling feedbacks chip, for providing 24V accessory power supplys to user's control circuit.
6. the portable built-in direct regulated power supplies of 400W of one kind according to claim 1, it is characterised in that the auxiliary electricity
Source plate component loads in mixture to paste, inserting.
7. the portable built-in direct regulated power supplies of 400W of one kind according to claim 1, it is characterised in that the input is whole
Stream device DB1 is pressure-resistant to be more than 600V, and continuous operating current is more than 5A, and main switch Q1, Q2 peak inrush current is 47A, resistance to
Press as 600V.
8. the portable built-in direct regulated power supplies of 400W of one kind according to claim 1, it is characterised in that the power supply sheet
Body (21) input voltage is：AC220V (175V~240V), 50~60Hz；Operating temperature range is：- 40 DEG C~+70 DEG C.
Export output voltage/electric current：First output be：DC0~185V/2.2A, the second output are：DC12V/0.4A, the 3rd is defeated
Go out for：DC 24V/0.4A；
Output ripple：First output be：≤ 200mV, the second output are：≤ 100mV, the 3rd output are：≤200mV；
Power-efficient：First output be：>=82%, second output be：>=70%, the 3rd output be：>=75%；
Power supply is pressure-resistant：Input-outlet chamber AC1500V, last 1 minute, without flashover, without breakdown；AC1500V between input-shell,
Last 1 minute, without flashover, without breakdown；AC500V between output-shell, last 1 minute, without flashover, without breakdown.
9. the portable built-in direct regulated power supplies of 400W of one kind according to claim 1, it is characterised in that the power supply sheet
The integrated aluminium shell of body (21), and the shell and internal power tube radiator.
A kind of 10. portable built-in direct regulated power supplies of 400W according to any one of claim 1 to 9, it is characterised in that
Power supply body (21) appearance and size is 173mm × 147mm × 61mm, weight 1.4Kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710898732.0A CN107546989A (en) | 2017-09-28 | 2017-09-28 | A kind of portable built-in direct regulated power supplies of 400W |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710898732.0A CN107546989A (en) | 2017-09-28 | 2017-09-28 | A kind of portable built-in direct regulated power supplies of 400W |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107546989A true CN107546989A (en) | 2018-01-05 |
Family
ID=60963815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710898732.0A Withdrawn CN107546989A (en) | 2017-09-28 | 2017-09-28 | A kind of portable built-in direct regulated power supplies of 400W |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107546989A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110209235A (en) * | 2019-05-28 | 2019-09-06 | 深圳市罗恩半导体有限公司 | A kind of PWM control integrated circuit |
| CN110380612A (en) * | 2019-07-08 | 2019-10-25 | 广州市凯辉电子有限公司 | A kind of Switching Power Supply of stable output |
-
2017
- 2017-09-28 CN CN201710898732.0A patent/CN107546989A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110209235A (en) * | 2019-05-28 | 2019-09-06 | 深圳市罗恩半导体有限公司 | A kind of PWM control integrated circuit |
| CN110380612A (en) * | 2019-07-08 | 2019-10-25 | 广州市凯辉电子有限公司 | A kind of Switching Power Supply of stable output |
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Application publication date: 20180105 |