CN104333722B - A kind of low-power consumption start-up circuit and a kind of LCD TV - Google Patents
A kind of low-power consumption start-up circuit and a kind of LCD TV Download PDFInfo
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- CN104333722B CN104333722B CN201410598068.4A CN201410598068A CN104333722B CN 104333722 B CN104333722 B CN 104333722B CN 201410598068 A CN201410598068 A CN 201410598068A CN 104333722 B CN104333722 B CN 104333722B
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Abstract
The present invention provides a kind of low-power consumption start-up circuit, including startup power supply, operation power supply, chip, booster circuit and automatic shutoff circuit；The booster circuit boosts under startup power supply excitation to chip power end VCC, bootrom；After chip starts, the operation power supply is powered to chip power end VCC, and the automatic shutoff circuit closes the booster circuit.Low-power consumption start-up circuit booster circuit of the invention can bootrom faster, and booster circuit is closed by automatic shutoff circuit after chip startup, so as to reduce power attenuation, improve properties of product.
Description
Technical field
The present invention relates to start-up circuit technical field, more particularly to a kind of low-power consumption start-up circuit and a kind of LCD TV.
Background technology
In the manufacturing field of LCD TV, some chips of current many LCD TVs are without high-voltage starting circuit, palpus
By the form directly power taking from high voltage of circuit partial pressure.But, in normal work, the start-up circuit has electric current to lead to always
Cross, so as to increase power attenuation.In order to reduce power consumption, then resistance is increased in start-up circuit, but so make chip voltage
Rise to operating voltage to be accomplished by for a long time, reducing chip starting efficiency, have impact on properties of product.Accordingly, it would be desirable to a kind of
Low-power consumption start-up circuit, to avoid drawbacks described above.
The content of the invention
It is an object of the invention to provide a kind of low-power consumption start-up circuit.By start-up circuit bootrom quickly,
After chip starts normal work, start-up circuit is closed by automatic shutoff circuit, reduce power consumption.
To solve the above problems, the present invention provides a kind of low-power consumption start-up circuit, including：Startup power supply, operation power supply, core
Piece, booster circuit and automatic shutoff circuit；The booster circuit boosts under startup power supply excitation to chip power end VCC,
Bootrom；After chip starts, the operation power supply is powered to chip power end VCC, and the automatic shutoff circuit is closed described
Booster circuit.
Further, the booster circuit, including the first electronic switch and the second electronic switch；The startup power supply connection
Second end of first electronic switch, chip power end VCC described in the three-terminal link of first electronic switch, described
The first end of one electronic switch connects the second end of second electronic switch, and the second electronic switch first end connection is described
Chip power end VCC, the 3rd end ground connection of second electronic switch, second end and the 3rd end point of second electronic switch
The two ends of the first electric capacity are not connected.
Further, the automatic shutoff circuit, including the 3rd electronic switch；3rd electronic switch, second end connects institute
Chip power end VCC is stated, the end of the 3rd electronic switch the 3rd ground connection, the chip power end VCC is connect by the first voltage-stabiliser tube
Ground, the 3rd electronic switch first end ground connection.
Further, first electronic switch is PNP triode, and its base stage, emitter stage and colelctor electrode correspond to the respectively
The first end of one electronic switch, the second end and the 3rd end, or the first electronic switch are P-channel field-effect transistor (PEFT) pipe, its grid, source electrode
And drain electrode corresponds to first end, the second end and the 3rd end of the first electronic switch respectively, and source electrode is connected with grid；Second electricity
Sub switch is NPN triode, its base stage, colelctor electrode and emitter stage correspond to respectively the first end of the second electronic switch, the second end and
3rd end, or the second electronic switch is N-channel FET, and its grid, drain electrode and source electrode correspond to the first electronic switch respectively
First end, the second end and the 3rd end.
Further, also including first resistor and second resistance, the startup power supply connects described first through first resistor
Second end of electronic switch, the second electronic switch first end connects the chip power end VCC through second resistance.
Further, the 3rd electronic switch is NPN triode, and its base stage, colelctor electrode and emitter stage correspond to the respectively
The first end of three electronic switches, the second end and the 3rd end, or the 3rd electronic switch are N-channel FET, its grid, drain electrode
And source electrode corresponds to first end, the second end and the 3rd end of the 3rd electronic switch respectively.
Further, also including 3rd resistor, the 4th resistance and the 5th resistance, second end of the 3rd electronic switch passes through
3rd resistor connects the chip power end VCC, and the chip power end VCC passes through the first voltage-stabiliser tube and the 4th resistance eutral grounding,
The 3rd electronic switch first end is connected between first voltage-stabiliser tube and the 4th resistance by the 5th resistance.
Further, also including the 6th resistance, when first electronic switch is PNP triode, the PNP triode
Base stage connect the end of the second electronic switch second and the first electric capacity through the 6th resistance；When the first electronic switch is P-channel
During effect pipe, the source electrode of the P-channel field-effect transistor (PEFT) pipe connects the end of the second electronic switch second and the first electricity through the 6th resistance
Hold.
Preferably, the operation power supply also connects chip power end VCC by isolating diode.
Preferably, the chip power end VCC also passes through the second capacity earth.
Preferably, the startup power supply is to take from the power supply after rectification.
A kind of LCD TV, including above-mentioned low-power consumption start-up circuit.The low-power consumption start-up circuit includes startup power supply, operation
Power supply, chip, booster circuit and automatic shutoff circuit；When starting LCD TV, the booster circuit is encouraged in the startup power supply
Under, chip power end VCC is boosted, bootrom；After chip starts, the operation power supply is powered to chip power end VCC,
The automatic shutoff circuit closes the booster circuit, and LCD TV normally runs.
Compared with prior art, advantages and positive effects of the present invention are：Low-power consumption start-up circuit of the invention, its boosting
Circuit greatly reduces the high-voltage power loss of circuit compared with the external high-tension circuit of chip, and can faster make chip
Power end boosting, reach chip start needed for voltage.After chip startup, by operation power supply continued power, while automatic shutoff
Circuit closes start-up circuit.So, startup power supply is cut off, and reduces power attenuation.Specific to LCD TV field, liquid crystal
Some of TV chip is without high-voltage starting circuit, such as PFC PFC (Power Factor Correct ion)
Chip, must pass through the form directly power taking from high voltage of circuit partial pressure.But, in normal work, the circuit has electricity always
Stream passes through, so as to increase power attenuation.In order to reduce power consumption, then resistance is increased in circuit, but so make chip voltage
Rise to operating voltage to be accomplished by for a long time, reducing chip starting efficiency, have impact on properties of product.The low-power consumption starts electricity
Road is connected on the chip without start-up circuit, by booster circuit bootrom quickly, and after chip startup, can be led to
Automatic shutoff circuit shut-off start-up circuit is crossed, power attenuation is reduced while chip starting efficiency is improved.
Brief description of the drawings
Fig. 1 is the structure chart of the better embodiment of low-power consumption start-up circuit of the present invention.
Fig. 2 is the chip power terminal voltage variation diagram of low-power consumption start-up circuit of the present invention.
Fig. 3 is the circuit diagram of the better embodiment of low-power consumption start-up circuit of the present invention.
Fig. 4 is the circuit diagram of the better embodiment of low-power consumption start-up circuit of the present invention.
Main element symbol description：
| Resistance | R1-R12 |
| PNP triode | Q1 |
| NPN triode | Q2、Q3 |
| P-channel field-effect transistor (PEFT) pipe | Q4 |
| N-channel FET | Q5、Q6 |
| Electric capacity | C1-C4 |
| Voltage-regulator diode | DW1、DW2 |
| Diode | D1、D2 |
| Chip power end | VCC |
Specific embodiment
To become apparent the purpose of the present invention, feature, specific embodiment of the invention is made below in conjunction with the accompanying drawings
Further instruction, however, the present invention can be realized with different forms, it is not considered that being simply confined to described embodiment.
As shown in figure 1, the present embodiment provides a kind of low-power consumption start-up circuit.Without self-start circuit in the chip, for example
It is PFC PFC (Power Factor Correct ion) chip.Without start-up circuit in PFC chips, it is necessary to logical
The directly power taking from high voltage of the form of oversampling circuit partial pressure.After PFC chips are started, the circuit has electric current to pass through always, so that
Increase power attenuation.In order to reduce power attenuation, then resistance is increased in circuit, but so chip voltage is risen to work
It is accomplished by for a long time, reducing chip starting efficiency as voltage, have impact on properties of product.And low-power consumption of the invention starts electricity
Road overcomes drawbacks described above, and its booster circuit boosts under startup power supply excitation to chip power end VCC, bootrom；
After chip starts, the operation power supply is powered to chip power end VCC, and the automatic shutoff circuit closes the booster circuit.
Booster circuit greatly reduces the high-voltage power loss of circuit compared with the external high-tension circuit of chip, and can make faster
The power end boosting of chip, reaches voltage needed for chip starts.After chip startup, by operation power supply continued power, while from
Breaking circuit closes start-up circuit, cuts off startup power supply.It follows that the low-power consumption start-up circuit is improving chip starting efficiency
While reduce power attenuation.
As shown in Figure 2 and Figure 3, the present embodiment chip is used in PFC chips, the PFC chips without self-start circuit, operation electricity
Source connects PFC chip powers end VCC by isolating diode D1, and PFC chip powers end VCC is grounded by electric capacity C2.The present invention
Described low-power consumption start-up circuit includes booster circuit and automatic shutoff circuit two parts.Wherein, booster circuit includes PNP triode
The elements such as Q1, NPN triode Q2.Specifically, connecting the transmitting of PNP triode Q1 by resistance R1 through the startup power supply of over commutation
Pole, the base stage of colelctor electrode connection PFC chip powers the end VCC, PNP triode Q1 of PNP triode Q1 connects NPN by resistance R6
The colelctor electrode of triode Q2 and electric capacity C1 one end, the base stage of NPN triode Q2 connect PFC chip powers end VCC through resistance R2,
The grounded emitter of NPN triode Q2, the collector and emitter of NPN triode Q2 connects the two ends of electric capacity C1 respectively.From pass
The deenergizing element such as including NPN triode Q3.Specifically, the colelctor electrode of NPN triode Q3 connects PFC chips electricity by resistance R3
Source VCC, the grounded emitter of NPN triode Q3, PFC chip powers end VCC is grounded by voltage-stabiliser tube DW1 and resistance R4, NPN
The base stage of triode Q3 is connected between voltage-stabiliser tube DW1 and resistance R4 by resistance R5.Within the 0-T1 times, now chip power
The supply voltage of VCC is held to change from the zero to U1.In this period, startup power supply electric current is by the colelctor electrode of resistance R1, Q1, Q1
Base stage and resistance R6 to electric capacity C1, charge with to electric capacity C1.So, Q1 is turned on and is caused that startup power supply charges to VCC, VCC voltages
It is gradually increasing.The lasting rising of VCC voltages, makes Q2 base stages trigger Q2 and turns on, and drags down Q1 base levels, ensures that Q1's
Constant conduction, continue for startup power supply be VCC charge.When VCC voltages are increased to U2 positions, lead voltage-stabiliser tube DW1
It is logical, and Q3 is turned on, now the base current of Q2 is cut off, and turns off Q2, and then be also switched off Q1.Now the voltage of VCC is steady
U2 is scheduled on, in such as Fig. 2 in the T2-T3 times.The voltage of U2 is more than PFC chip cut-in voltages, and chip is started working, and operation power supply is
The VCC of chip powers, chip normal work.Wherein, the voltage of operation power supply is greater than the voltage of U2.After chip normal work,
Q3 is turned on all the time, and Q2 is closed all the time, and Q1 is so as to also be switched off.So, start-up circuit is just have turned off, so as to reduce power consumption.
In the present embodiment, R1 is current-limiting resistance, and on startup, electric current charges by R1 to VCC；R2 is current-limiting resistance, for limiting warp
VCC flow to the electric current of Q2 base stages；R3 is current-limiting resistance, and the electric current of Q3 is flow to for limiting；This circuit, in R2 and R3, can be only
Retain R3, R3 is also acted as the effect of R2；R4 is the electric leakage absorption resistance of voltage-stabiliser tube DW1, it is possible to ensure to be led in voltage-stabiliser tube DW1
When logical, it is ensured that the conducting of Q3；R5 is current-limiting resistance, and the electric current of Q3 base stages is flow to for limiting；R6 is current-limiting resistance, limits Q1 bases
The electric current of pole, and charging circuit is formed with C1, to provide enough charging currents；C1 is electric capacity, and RC filtering is constituted together with R6
Circuit, makes Q1 have time enough to be charged to VCC, VCC voltages is raised triggering Q2 and turns on；C2 is electric capacity, is played as power supply is filtered
The effect of ripple；DW1 is voltage-stabiliser tube, setting voltage value, and when VCC voltages are increased to now, voltage-stabiliser tube DW1 conductings turn on Q3, this
When Q2 base current be cut off, turn off Q2, and then be also switched off Q1；D1 is isolating diode, for isolating operation power supply, is prevented
Only circuit is to running the interference of power supply, so as to run power good operation.The booster circuit of this programme low-power consumption start-up circuit can
So that the power end VCC of PFC chips to boost quickly, and start PFC chips.Continued by operation power supply after the startup of PFC chips
Power supply, automatic shutoff circuit closes booster circuit to cut off startup power supply, so as to reduce power attenuation, improves properties of product.
As shown in Figure 2, Figure 4 shows, the present embodiment chip is used in PFC chips, the PFC chips without self-start circuit, operation electricity
Source connects PFC chip powers end VCC by isolating diode D2, and PFC chip powers end VCC is grounded by electric capacity C4.
Low-power consumption start-up circuit of the present invention includes booster circuit and automatic shutoff circuit two parts.Wherein, piezoelectricity is risen
The road element such as including P-channel field-effect transistor (PEFT) pipe Q4, N-channel FET Q5.Specifically, passing through resistance through the startup power supply of over commutation
The source electrode of R7 connection P-channel field-effect transistor (PEFT) pipes Q4, the drain electrode connection PFC chip powers end VCC of P-channel field-effect transistor (PEFT) pipe Q4, P-channel
The source electrode of effect pipe Q4 connects grid, the drain electrode of N-channel FET Q5 and the electricity of N-channel FET Q4 by resistance R12
Hold C3 one end, the grid of N-channel FET Q5 connects PFC chip powers end VCC through resistance R8, N-channel FET Q5's
Source ground, the drain electrode of N-channel FET Q5 and source electrode connect the two ends of electric capacity C3 respectively.Automatic shutoff circuit includes N-channel
The elements such as FET Q6.Specifically, the drain electrode of N-channel FET Q6 connects PFC chip powers end VCC, N by resistance R9
Channel field-effect pipe Q6 source grounds, PFC chip powers end VCC is grounded by voltage-stabiliser tube DW2 and resistance R10, N-channel field-effect
The grid of pipe Q6 is connected between voltage-stabiliser tube DW5 and resistance R10 by resistance R11.Within the 0-T1 times, now chip power end
The power supply of VCC changes from the zero to U1.In this period, startup power supply electric current charges by R7, R12 to C3 with to C3.So,
The GS voltages of Q4 are reverse-biased, turn on Q4 so that startup power supply charges to VCC, and VCC voltages are gradually increasing.On the continuing of VCC voltages
Rise, turn on Q5, make the GS voltages of Q4 reverse-biased always, ensure that the constant conduction of Q1, startup power supply is continued for ground
For VCC charges.When VCC voltages are increased to U2 positions, voltage-stabiliser tube DW2 is turned on, and turn on Q6, now the grid level of Q5
It is pulled low, turns off Q5, and then be also switched off Q4.Now the voltage of VCC is stabilized in U2, in such as Fig. 2 in the T2-T3 times.U2's
Voltage is more than PFC chip cut-in voltages, and chip is started working, and operation power supply is powered for the VCC of chip, chip normal work.Its
In, the voltage for running power supply is greater than the voltage of U2.After chip normal work, Q6 is turned on all the time, and Q5 is closed all the time, Q4 so as to
It is switched off.So, start-up circuit is just have turned off, so as to reduce power consumption.In the present embodiment, R7 is current-limiting resistance, is being started
When, electric current charges by R7 to VCC；R8 is current-limiting resistance, flow to the electric current of Q5 base stages through VCC for limiting；R9 is current limliting electricity
Resistance, the electric current of Q6 is flow to for limiting；This circuit, in R8 and R9, can only retain R9, R9 is also acted as the effect of R8；R10 is
The electric leakage absorption resistance of voltage-stabiliser tube DW2, it is possible to ensure when voltage-stabiliser tube DW2 is turned on, it is ensured that the conducting of Q6；R11 is current limliting electricity
Resistance, the electric current of Q6 grids is flow to for limiting；R12 is current-limiting resistance, and charging circuit is formed with C3, to provide enough charging electricity
Stream；C3 is electric capacity, and RC filter circuits are constituted together with R12, makes Q4 have time enough to be charged to VCC, raises VCC voltages and touches
Hair Q5 conductings；C4 is electric capacity, and it is power filter to play a part of；DW2 is voltage-stabiliser tube, setting voltage value, when VCC voltages are increased to
Now, voltage-stabiliser tube DW2 conductings, turn on Q6, and now the grid voltage of Q5 is cut off, and turns off Q5, and then be also switched off Q4；D2 is
Isolating diode, for isolating operation power supply, prevents circuit to running the interference of power supply, so that operation power good operation.This
The booster circuit of scheme low-power consumption start-up circuit quickly can boost the power end VCC of PFC chips, and start PFC chips.
By operation power supply continued power after the startup of PFC chips, automatic shutoff circuit closes booster circuit to cut off startup power supply, so as to drop
Low power attenuation, improves properties of product.
The present invention also provides a kind of LCD TV, including above-mentioned low-power consumption start-up circuit.
Obviously, those skilled in the art can carry out various changes and modification without deviating from spirit of the invention to invention
And scope.So, if these modifications of the invention and modification belong to the claims in the present invention and its equivalent technologies scope it
Interior, then the present invention is also intended to comprising these changes and modification.
Claims (9)
1. a kind of low-power consumption start-up circuit, it is characterised in that including：
Startup power supply, operation power supply, chip, booster circuit and automatic shutoff circuit；
The booster circuit boosts under startup power supply excitation to chip power end VCC, bootrom；
After chip starts, the operation power supply is powered to chip power end VCC, and the automatic shutoff circuit closes described liter of piezoelectricity
Road；
The booster circuit, including the first electronic switch and the second electronic switch；The startup power supply passes through current-limiting resistance and institute
The second end connection of the first electronic switch is stated, chip power end VCC described in the three-terminal link of first electronic switch is described
The first end of the first electronic switch connects the second end of second electronic switch, and the second electronic switch first end is by limit
Leakage resistance connects the chip power end VCC, the 3rd end ground connection of second electronic switch, and the of second electronic switch
Two ends and the 3rd end connect the two ends of the first electric capacity respectively.
2. low-power consumption start-up circuit as claimed in claim 1, it is characterised in that：The automatic shutoff circuit, including the 3rd electronics
Switch；3rd electronic switch, second end connects the chip power end VCC, and the end of the 3rd electronic switch the 3rd is grounded,
The chip power end VCC is grounded by the first voltage-stabiliser tube, the 3rd electronic switch first end ground connection.
3. low-power consumption start-up circuit as claimed in claim 1, it is characterised in that：First electronic switch is PNP triode,
Its base stage, emitter stage and colelctor electrode correspond to first end, the second end and the 3rd end of the first electronic switch, or the first electronics respectively
It is P-channel field-effect transistor (PEFT) pipe to switch, and its grid, source electrode and drain electrode correspond to the first end of the first electronic switch, the second end and the respectively
Three ends, and source electrode is connected with grid；Second electronic switch is NPN triode, and its base stage, colelctor electrode and emitter stage are right respectively
First end, the second end and the 3rd end of the second electronic switch, or the second electronic switch are answered for N-channel FET, its grid,
Drain electrode and source electrode correspond to first end, the second end and the 3rd end of the first electronic switch respectively.
4. low-power consumption start-up circuit as claimed in claim 3, it is characterised in that：Also include first resistor and second resistance, institute
The second end that startup power supply connects first electronic switch through first resistor is stated, the second electronic switch first end is through second
Resistance connects the chip power end VCC.
5. low-power consumption start-up circuit as claimed in claim 2, it is characterised in that：3rd electronic switch is NPN triode,
Its base stage, colelctor electrode and emitter stage correspond to first end, the second end and the 3rd end of the 3rd electronic switch, or the 3rd electricity respectively
Sub switch is N-channel FET, its grid, drain electrode and source electrode correspond to respectively the first end of the 3rd electronic switch, the second end and
3rd end.
6. low-power consumption start-up circuit as claimed in claim 5, it is characterised in that：Also include 3rd resistor, the 4th resistance and the
Five resistance, second end of the 3rd electronic switch connects the chip power end VCC, the chip power end by 3rd resistor
VCC is connected to described by the first voltage-stabiliser tube and the 4th resistance eutral grounding, the 3rd electronic switch first end by the 5th resistance
Between first voltage-stabiliser tube and the 4th resistance.
7. low-power consumption start-up circuit as claimed in claim 3, it is characterised in that：Also include the 6th resistance, when the described first electricity
When sub switch is PNP triode, the base stage of the PNP triode through the 6th resistance connect the end of the second electronic switch second and
First electric capacity；When the first electronic switch is P-channel field-effect transistor (PEFT) pipe, the source electrode of the P-channel field-effect transistor (PEFT) pipe connects through the 6th resistance
Connect the end of the second electronic switch second and the first electric capacity.
8. the low-power consumption start-up circuit as described in any one of claim 1 to 7, it is characterised in that：The operation power supply also passes through
Isolating diode connection chip power end VCC.
9. a kind of LCD TV, it is characterised in that：Including the low-power consumption start-up circuit as any one of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410598068.4A CN104333722B (en) | 2014-10-30 | 2014-10-30 | A kind of low-power consumption start-up circuit and a kind of LCD TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410598068.4A CN104333722B (en) | 2014-10-30 | 2014-10-30 | A kind of low-power consumption start-up circuit and a kind of LCD TV |
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| Publication Number | Publication Date |
|---|---|
| CN104333722A CN104333722A (en) | 2015-02-04 |
| CN104333722B true CN104333722B (en) | 2017-07-07 |
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| CN201410598068.4A Active CN104333722B (en) | 2014-10-30 | 2014-10-30 | A kind of low-power consumption start-up circuit and a kind of LCD TV |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105978316B (en) * | 2016-06-29 | 2018-07-24 | 成都四威功率电子科技有限公司 | A kind of Switching Power Supply starts and protection circuit |
| CN108039814A (en) * | 2017-12-16 | 2018-05-15 | 无锡昌至盛机械制造有限公司 | A kind of adjustable high-voltage starting circuit of output voltage |
| CN108112120A (en) * | 2017-12-16 | 2018-06-01 | 无锡昌至盛机械制造有限公司 | A kind of high-voltage high-speed start-up circuit of low-power consumption |
| CN108174482A (en) * | 2017-12-28 | 2018-06-15 | 无锡昌至盛机械制造有限公司 | A kind of high-voltage starting circuit of supper-fast low-power consumption |
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| CN102075002A (en) * | 2010-12-29 | 2011-05-25 | 深圳市火天光电科技有限公司 | Dual power supply circuit |
| CN102969782A (en) * | 2012-10-26 | 2013-03-13 | 深圳市英威腾电气股份有限公司 | Chip starting circuit |
| CN204190851U (en) * | 2014-10-30 | 2015-03-04 | 青岛歌尔声学科技有限公司 | A kind of low-power consumption start-up circuit and a kind of LCD TV |
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- 2014-10-30 CN CN201410598068.4A patent/CN104333722B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075002A (en) * | 2010-12-29 | 2011-05-25 | 深圳市火天光电科技有限公司 | Dual power supply circuit |
| CN102969782A (en) * | 2012-10-26 | 2013-03-13 | 深圳市英威腾电气股份有限公司 | Chip starting circuit |
| CN204190851U (en) * | 2014-10-30 | 2015-03-04 | 青岛歌尔声学科技有限公司 | A kind of low-power consumption start-up circuit and a kind of LCD TV |
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| CN104333722A (en) | 2015-02-04 |
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