CN207021907U - A kind of device for lifting power supply conversion efficiency and suppressing heat start dash current - Google Patents
A kind of device for lifting power supply conversion efficiency and suppressing heat start dash current Download PDFInfo
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- CN207021907U CN207021907U CN201720517225.3U CN201720517225U CN207021907U CN 207021907 U CN207021907 U CN 207021907U CN 201720517225 U CN201720517225 U CN 201720517225U CN 207021907 U CN207021907 U CN 207021907U
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Abstract
A kind of device for lifting power supply conversion efficiency and suppressing heat start dash current disclosed in the utility model, the input of common mode inductance one is connected after the fuse concatenation power resistor at alternating current L ends, transformer is connected after the rectified bridge of common mode inductance output end, the transformer is provided with the first winding, the different name end connecting valve pipe source electrode of first winding, the node that switching tube drain electrode connection fuse concatenates with power resistor, switch tube grid and connect diode cathode through second resistance, diode cathode connects the Same Name of Ends of the winding of transformer first；Switch the different name end that tube grid also connects the first winding through 3rd resistor；Node connection electric capacity one end that diode cathode is connected with second resistance, the electric capacity other end connect the different name end of the first winding；One voltage-regulator diode is in parallel with 3rd resistor, and voltage-regulator diode positive pole connects the different name end of the first winding.The device can allow power panel fuse and rectifier bridge in cold and hot start by less dash current；Improve Switching Power Supply production interchange efficiency.
Description
Technical field
Power-supply device technical field is the utility model is related to, more particularly to one kind can lift power supply conversion efficiency and suppress heat
The device of start dash current.
Background technology
Fig. 1 be exchange on a kind of liquid crystal display product power panel of the prior art turn direct current change-over circuit one it is specific
Embodiment, due to power frequency bulky capacitor C4 equivalent series resistance, (abbreviation ESR, when working frequency is 120Hz, its ESR generally exists
Within 2 Ω) and the DC impedance (abbreviation RL1/RL2 generally only hundreds of m Ω or so) of two windings of common mode inductance L1 it is smaller,
The dash current between start Shun can not preferably be suppressed, therefore led between the fuse F1 and rectifier bridge D1~D4 of L ends (live wire)
Thermistor (abbreviation NTCR) NR1 can often be concatenated to prevent power input because flowing through fuse F1 and rectification during start
Bridge D1~D4 dash current is excessive, and causes fuse and rectifier bridge D1~D4 to damage；Fig. 2 is power input L ends (fire
Line) start between N-terminal (center line) when dash current path equivalent circuit diagram, because power input is alternating current, therefore
Power input dash current can flow to N-terminal from L ends, and L ends can be also flowed to from N-terminal, according to formula I=U/R, if R is definite value
When, when U is bigger, then I is also bigger, i.e.,：When the alternating current of power network is input to power panel input, and enter the electricity of power panel at first
When pressure is just sinusoidal crest value, the dash current of power input is maximum, and oscillogram refer to Fig. 3,
Therefore dash current：
Assuming that：AC-input voltage maximum Vacmax=264V
Rectifier bridge diode D1/D2 forward conduction voltages VD1=VD2=1V
Two direct current impedance R of common mode inductance of EMI circuitsL1=RL2=0.5 Ω
Power frequency bulky capacitor C3 equivalent series resistance ESR=1.2 Ω
NR1 thermistor is from the resistance that resistance is 10 Ω at 25 DEG C
Then Iin-rush=30.4A, therefore in first time cold boot, flow through fuse F1 and rectifier bridge diode D1/D2
Or the dash current of D3/D4 maximums is 31.4 amperes.
Because thermistor is negative temperature coefficient resister, be affected by temperature it is larger, with reference to figure 4, NTCR resistances and temperature
Graph of relation, such as：When longer period of time NTCR body temperatures rise to 100 DEG C after start, now corresponding NTCR
Resistance is only 1.3 Ω, if being started shooting again by the short period again when now turning off input alternating current, then flows through fuse F1
NTCR suppresses the impact of input when maximum dash current is up to 97A, i.e. heat start with commutation diode D1/D2 or D3/D4
Electric current poor effect.
Thermistor NR1 is also bigger in terms of efficiency loss, such as：One output Pout=50W Switching Power Supply plate, if opening
It is 85% to close Power convert u, when when it be 90V to input power frequency ac voltage U, foundation Pin=U*I*Cos θ=Pout/u, its
Middle Pin is Switching Power Supply input power, and Cos θ are power factor (PF), and conduction angle is about 50 degree or so when Switching Power Supply works,
Cos θ=0.64, now 90V*I*0.64=50W/85%==>Switching Power Supply input current I=1.02A, normal work
NTCR temperature stabilizations are at 100 degree, NTCR resistance R=1.3 Ω, then power consumption of the loss on the NR1 points position is PNR1=I2*R=
1.02A2*1.3 Ω=1.35W, i.e., lose efficiency u (NR1)=PNR1/Pin=1.35W/ (50W/ on the NR1 points position
85%)=2.29%.
Have the following disadvantages in the prior art：
1st, the thermistor of NTCR negative temperature coefficients, its resistance are greatly influenced by temperature, and cause (the machine work when heat is started shooting
After making a period of time, the power down of ac input end elder generation, powering afterwards and immediately) fuse F1 and rectifier bridge D1~D4 be by very big
Circuit is impacted, influences its service life, fuse and rectifier bridge is easily damaged by dash current during heat start.
2nd, NTCR applies has a great influence in Switching Power Supply input to Switching Power Supply energy conversion efficiency, existing countries in the world peace
Advise certification authority all carrying out saving certification, release EPA7.0 efficiencies in liquid crystal display product if Environmental Protection Agency EPA and newly mark
Standard, if liquid crystal display product internal switch power supply energy conversion efficiency is too low, it is possible to cause corresponding liquid crystal display product
EPA7.0 certifications can not be passed through.
Utility model content
The purpose of this utility model is, proposes a kind of fuse that can allow power panel and rectifier bridge in cold boot and Re Kai
By less dash current during machine so that the part such as fuse and rectifier bridge has longer service life, can reduce because of heat
Start causes fuse and rectifier bridge market bad, so as to lift the quality of power supply product；Powered-down product-derived conversion can be got out of the way
It is more efficient, more save, allow display product new more easily by EPA7.0 energy-efficiency certification the problem of.
To achieve these goals, technical scheme is used by the utility model：
A kind of device for lifting power supply conversion efficiency and suppressing heat start dash current, the fuse string at alternating current L ends
The input of common mode inductance one is connected after connecing power resistor, transformer, the transformation are connected after the rectified bridge of common mode inductance output end
Device is provided with the first winding, the different name end connecting valve pipe source electrode of the first winding, switching tube drain electrode connection fuse and power electricity
The node of concatenation is hindered, switch tube grid connects diode cathode, the diode cathode connection winding of transformer first through second resistance
Same Name of Ends；Switch the different name end that tube grid also connects the first winding through 3rd resistor；Diode cathode is connected with second resistance
Node connection electric capacity one end, the electric capacity other end connects the different name end of the first winding；One voltage-regulator diode is in parallel with 3rd resistor,
Voltage-regulator diode positive pole connects the different name end of the first winding.
Wherein, the transformer is flyback transformer.
The beneficial effects of the utility model are：
In cold boot or heat start, and before transformer T1 does not start working, alternating current passes through power resistor
(R11) charged to power frequency bulky capacitor C4, when transformer is started working, the first winding Ndet senses a voltage to be led by switching tube
Logical, now due to more small compared with power resistor of switching tube Rds (On) resistances, therefore electric current almost flows through from switching tube.
Overcome former NTCR because heat start shooting when impedance seriously diminish caused by input fuse and rectifier bridge dash current
It is excessive so as to cause the damage parts such as fuse and rectifier bridge the problem of.Simultaneously because switching tube Rds (On) resistance is very small, such as:
Rds (On) using full space sunrise MTN9240J3 models switching tube in Vgs=10V only has 45m Ω, Switching Power Supply normal work
When power consumption of the loss on switching tube be PQ2=I2*Rds (On)=1.02A2*0.045 Ω=0.0468W, be significantly smaller than and show
NTCR losses are used to lose efficiency u (Q2)=PQ2/Pin=0.0468W/ on the switching tube point position for 1.35W
(50W/85%)=0.079%, it is much smaller that efficiency u (NR1)=2.29% is lost using NTCR than before.
Brief description of the drawings
Fig. 1 is that liquid crystal display product of the prior art suppresses impact during start using NTCR resistance (NR1 points position)
The circuit diagram of electric current；
Fig. 2 dash current loop equivalent circuit diagrams between AC power L ends of the prior art and N-terminal；
Fig. 3 be in the prior art input ac voltage highest when fuse and rectifier bridge impulse current waveform figure；
Fig. 4 in the prior art 25 DEG C when resistance be 10 Ω NTCR temperature and the graph of a relation of resistance；
Fig. 5 is that of the present utility model a kind of lifting switch power supply conversion efficiency and can suppress heat start dash current device
Circuit structure diagram；
Fig. 6 is that of the present utility model a kind of lifting switch power supply conversion efficiency and can suppress heat start dash current device
Dash current loop equivalent circuit diagram between power supply L ends and N-terminal.
Embodiment
The utility model is described in detail below with reference to embodiment shown in the drawings.But these embodiment party
Formula is not intended to limit the utility model, structure that one of ordinary skill in the art is made according to these embodiments, method or
Conversion functionally is all contained in the scope of protection of the utility model.
Power supply conversion efficiency and suppression can be lifted refering to one kind is provided shown in Fig. 5 and Fig. 6, in the embodiment of the utility model one
The device of heating start dash current, the fuse F1 at alternating current L ends concatenate connection common mode inductance L1 mono- after power resistor R11
Input, connection transformer T1, the transformer T1 are provided with the first winding Ndet after the rectified bridge of common mode inductance L1 output ends,
First winding Ndet different name end connecting valve pipe Q2 source electrodes, switching tube Q2 drain electrodes connection fuse F1 and power resistor R11 go here and there
The node connect, switching tube Q2 grids are through second resistance R13 connection diode D7 negative poles, diode D7 positive poles connection transformer T1
First winding Ndet Same Name of Ends；Different name end of the switching tube Q2 grids also through 3rd resistor R12 the first windings of connection Ndet；Two poles
Node connection electric capacity C11 one end that pipe D7 negative poles are connected with second resistance R13, the electric capacity C11 other ends connect the first winding Ndet
Different name end；One voltage-regulator diode ZD1 is in parallel with 3rd resistor R12, and voltage-regulator diode ZD1 positive poles connect the first winding Ndet's
Different name end.
In a preferred embodiment, the transformer (T1) is flyback transformer.
The operation principle of the described device for lifting power supply conversion efficiency and suppressing heat start dash current is as follows：
1. when power panel is initially powered, after the fuse F1 that AC current passes through L ends by power resistor R11 again
Charged through EMI common mode inductances L1 and rectifier bridge D1~D4 to power frequency bulky capacitor C4, the dash current path with reference to shown in figure 6：
1. L ends → power resistor R11 → common mode inductance winding RL1 → rectifier bridge diode D1 → power frequency bulky capacitor C4 → rectification diode
D2 → common mode inductance winding RL2 → N-terminal；2. N-terminal → common mode inductance winding RL2 → rectification diode D3 → power frequency bulky capacitor C4 →
Rectifier bridge diode D4 → common mode inductance winding RL1 → power resistor R11 → L ends, at the same time power frequency bulky capacitor C4 pass through one
Resistance R1 is electrically connected to the end of high voltage startup pin 301 of driving chip 30, leads to inside the driving chip of high voltage startup pin 301
Cross and set a constant-current source to carry out punching electricity to power supply capacitor C5 from the end of energization pins 302 of driving chip 30, when driving chip 30
When the terminal voltage of energization pins 302 reaches driving chip cut-in voltage (Vcc_on), the output end 303 of driving chip 30 will export
One pulse square wave is (referred to as：PWM square waves) by a resistance R3 MOS switch pipe Q1 grids (Gate ends) are given, now MOS switch pipe
Q1 controls transformer T1 working condition according to the dutycycle of the PWM square waves of grid.
2. when MOS switch pipe Q1 turn on (turn on) when, transformer T1 Np/Nvcc/Ns/Ndet Motor Winding Same Name of Ends (
Dotted end) sense that voltage is referred to as "-", Np/Nvcc/Ns/Ndet winding different names end (also referred to as non-dotted end) senses that voltage is
“+”；
Now, the air gap (Gap) that magnetic energy is stored in magnetic core of transformer is converted electrical energy into by transformer T1 Np windings
In.
When MOS switch pipe Q1 close (turn off) when, transformer T1 Np/Nvcc/Ns/Ndet Motor Winding Same Name of Ends (
Dotted end) sense that voltage is referred to as "+", Np/Nvcc/Ns/Ndet winding different names end (also referred to as non-dotted end) senses that voltage is
“-”；Now, the gas gap energy in transformer T1 will discharge, from Ns windings by D5 commutation diodes and output filtered electrical
Direct current is exported after the electrochemical capacitor C8/ inductance L2/ electrochemical capacitors C9 of road and supplies electricity to other circuits such as：Motherboard circuit, LED lamp tube are driven
Dynamic circuit work；A voltage is exported by being supplied after commutation diode D6 and power supply capacitor C5 from driving chip from Nvcc windings
The electric end of pin 302 provides supply voltage for driving chip；A voltage is exported through D7 commutation diodes to C11 electricity from Ndet windings
Voltage on Rong Chong electricity, C1 electric capacity provides MOS switch pipe Q2 grid after 3rd resistor R12, second resistance R13 partial pressures
(Gate ends), make MOS switch pipe Q2 ON operations, now the electric current of the input of alternating current is from MOS switch pipe Q2 drain electrode-source
Pole is flowed through, and is charged through EMI common mode inductances L1 and rectifier bridge D1~D4 toward power frequency bulky capacitor C4.
Content is understood from above：Power panel is in cold boot or heat start each time, the input electricity of alternating current
Stream charges after power resistor R11 current limlitings by rectifier bridge D1~D4 to power frequency bulky capacitor C4, and it impacts maximum current
For：
Assuming that：AC-input voltage maximum Vacmax=264V
Rectifier bridge diode D1/D2 forward conduction voltages VD1=VD2=1V
Two direct current impedance R of common mode inductance of EMI circuitsL1=RL2=0.5 Ω
Power frequency bulky capacitor C3 equivalent series resistance ESR=1.2 Ω
Power resistor R11 chooses 5 Ω/5W cement resistor
Then：Iin-rush=51.2A, relatively using impact electricity maximum when heat is started shooting the NTCR that resistance is 10 Ω at 25 DEG C
Stream is much smaller up to 97A.
When power frequency bulky capacitor C4 rushes electricity end and transformer T1 starts working, MOS switch pipe Q2 is turned on, now alternating current
Input electric current flows through between the Drain-Source by MOS switch pipe Q2, whole by EMI common mode inductances L1 and rectifier bridge D1~D4
DC pulse moving voltage is changed into after stream and gives power frequency bulky capacitor C4, then is supplied to transformer T1 to do energy by power frequency bulky capacitor C4 and turns
Change.
3. because this circuit power resistance R11 is to be used for suppressing to flow through fuse F1 and rectifier bridge D1 in cold and hot start
~D4 dash current, when switching mode power supply transformer T1 starts normal transmission electric energy, AC input electric current is almost by MOS
Flow through between switching tube Q2 Drain-Source, and do not flowed through substantially from power resistor R11, and the conduction impedance of metal-oxide-semiconductor is usual
Very little, such as:Using full space sunrise MTN9240J3 models, in Vgs=10V, MOS Rds (On) only have 45m Ω, and Switching Power Supply is normal
Power consumption of the loss on MOS switch pipe Q2 is (existing for PQ2=I2*Rds (On)=1.02A2*0.045 Ω=0.0468W during work
NTCR losses are used as 1.35W), i.e., lose efficiency u (Q2)=PQ2/Pin=on MOS switch pipe Q2 points position
0.0468W/ (50W/85%)=0.079%, it is much smaller that efficiency u (NR1)=2.29% is lost using NTCR than before.
It should be appreciated that although the present specification is described in terms of embodiments, not each embodiment only includes one
Individual independent technical scheme, this narrating mode of specification is only that those skilled in the art will should say for clarity
For bright book as an entirety, the technical scheme in each embodiment may also be suitably combined to form those skilled in the art can
With the other embodiment of understanding.
The a series of tool described in detail only for feasibility embodiment of the present utility model of those listed above
Body illustrates that they are simultaneously not used to limit the scope of protection of the utility model, all to be made without departing from the utility model skill spirit
Equivalent implementations or change should be included within the scope of protection of the utility model.
Claims (2)
- A kind of 1. device for lifting power supply conversion efficiency and suppressing heat start dash current, it is characterised in that：Alternating current L ends Fuse (F1) concatenation power resistor (R11) connects common mode inductance (L1) input afterwards, and common mode inductance (L1) output end is through whole Transformer (T1) is connected after flowing bridge, the transformer (T1) is provided with the first winding (Ndet), the different name of the first winding (Ndet) Connecting valve pipe (Q2) source electrode is held, the node that switching tube (Q2) drain electrode connection fuse (F1) concatenates with power resistor (R11), is opened Close pipe (Q2) grid and connect diode (D7) negative pole, diode (D7) positive pole connection transformer (T1) the through second resistance (R13) The Same Name of Ends of one winding (Ndet)；Switching tube (Q2) grid also connects the different name of the first winding (Ndet) through 3rd resistor (R12) End；Node connection electric capacity (C11) one end that diode (D7) negative pole is connected with second resistance (R13), electric capacity (C11) other end connect Connect the different name end of the first winding (Ndet)；One voltage-regulator diode (ZD1) is in parallel with 3rd resistor (R12), voltage-regulator diode (ZD1) Positive pole connects the different name end of the first winding (Ndet).
- 2. a kind of device for lifting power supply conversion efficiency and suppressing heat start dash current according to claim 1, its It is characterised by：The transformer (T1) is flyback transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720517225.3U CN207021907U (en) | 2017-05-11 | 2017-05-11 | A kind of device for lifting power supply conversion efficiency and suppressing heat start dash current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720517225.3U CN207021907U (en) | 2017-05-11 | 2017-05-11 | A kind of device for lifting power supply conversion efficiency and suppressing heat start dash current |
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| Publication Number | Publication Date |
|---|---|
| CN207021907U true CN207021907U (en) | 2018-02-16 |
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| CN201720517225.3U Expired - Fee Related CN207021907U (en) | 2017-05-11 | 2017-05-11 | A kind of device for lifting power supply conversion efficiency and suppressing heat start dash current |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412398A (en) * | 2018-10-31 | 2019-03-01 | 京东方科技集团股份有限公司 | Dash current inhibits mould group, method and power supply device |
-
2017
- 2017-05-11 CN CN201720517225.3U patent/CN207021907U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412398A (en) * | 2018-10-31 | 2019-03-01 | 京东方科技集团股份有限公司 | Dash current inhibits mould group, method and power supply device |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180216 |
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| CF01 | Termination of patent right due to non-payment of annual fee |