CN204190851U - 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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- CN204190851U CN204190851U CN201420640298.8U CN201420640298U CN204190851U CN 204190851 U CN204190851 U CN 204190851U CN 201420640298 U CN201420640298 U CN 201420640298U CN 204190851 U CN204190851 U CN 204190851U
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Abstract
The utility model provides a kind of low-power consumption start-up circuit, comprises starting power supply, running power supply, chip, booster circuit and from breaking circuit; Described booster circuit, under described startup power supply excitation, boosts to chip power end VCC, bootrom; When after chip enable, described operation power supply is powered to chip power end VCC, describedly closes described booster circuit from breaking circuit.Low-power consumption start-up circuit booster circuit of the present utility model can bootrom faster, and by closing booster circuit from breaking circuit after chip enable, thus reduce power loss, improve properties of product.
Description
Technical field
The utility model relates to start-up circuit technical field, particularly relates 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 chip of current a lot of LCD TV, must by the form of circuit dividing potential drop directly from power taking high voltage without high-voltage starting circuit.But when normally working, this start-up circuit has electric current to pass through, thus increases power loss always.In order to reduce power consumption, then to strengthen resistance in start-up circuit, but make chip voltage rise to operating voltage with regard to needing for a long time like this, reduce chip enable efficiency, have impact on properties of product.Therefore, need a kind of low-power consumption start-up circuit, to avoid above-mentioned defect.
Utility model content
The purpose of this utility model is to provide a kind of low-power consumption start-up circuit.By start-up circuit bootrom quickly, after chip enable normally works, by closing start-up circuit from breaking circuit, reduce power consumption.
For solving the problem, the utility model provides a kind of low-power consumption start-up circuit, comprising: start power supply, run power supply, chip, booster circuit and from breaking circuit; Described booster circuit, under described startup power supply excitation, boosts to chip power end VCC, bootrom; When after chip enable, described operation power supply is powered to chip power end VCC, describedly closes described booster circuit from breaking circuit.
Further, described booster circuit, comprises the first electronic switch and the second electronic switch; Described startup power supply connects the second end of described first electronic switch, chip power end VCC described in the three-terminal link of described first electronic switch, the first end of described first electronic switch connects the second end of described second electronic switch, described second electronic switch first end connects described chip power end VCC, 3rd end ground connection of described second electronic switch, the second end and the 3rd end of described second electronic switch are connected the two ends of the first electric capacity respectively.
Further, described from breaking circuit, comprise the 3rd electronic switch; Described 3rd electronic switch second end connects described chip power end VCC, described 3rd electronic switch the 3rd end ground connection, and described chip power end VCC passes through the first voltage-stabiliser tube ground connection, described 3rd electronic switch first end ground connection.
Further, described first electronic switch is PNP triode, its base stage, emitter and collector electrode be the first end of corresponding first electronic switch, the second end and the 3rd end respectively, or the first electronic switch is P-channel field-effect transistor (PEFT) pipe, its grid, source electrode and drain first end, the second end and the 3rd end of distinguishing corresponding first electronic switch, and source electrode is connected with grid; Described second electronic switch is NPN triode, its base stage, collector electrode and emitter be the first end of corresponding second electronic switch, the second end and the 3rd end respectively, or the second electronic switch is N channel field-effect pipe, its grid, drain electrode and source electrode be the first end of corresponding first electronic switch, the second end and the 3rd end respectively.
Further, also comprise the first resistance and the second resistance, described startup power supply connects the second end of described first electronic switch through the first resistance, and described second electronic switch first end connects described chip power end VCC through the second resistance.
Further, described 3rd electronic switch is NPN triode, its base stage, collector electrode and emitter be the first end of corresponding 3rd electronic switch, the second end and the 3rd end respectively, or the 3rd electronic switch is N channel field-effect pipe, its grid, drain electrode and source electrode be the first end of corresponding 3rd electronic switch, the second end and the 3rd end respectively.
Further, also comprise the 3rd resistance, the 4th resistance and the 5th resistance, described 3rd electronic switch second end connects described chip power end VCC by the 3rd resistance, described chip power end VCC is by the first voltage-stabiliser tube and the 4th grounding through resistance, and described 3rd electronic switch first end is connected between described first voltage-stabiliser tube and described 4th resistance by the 5th resistance.
Further, also comprise the 6th resistance, when described first electronic switch is PNP triode, the base stage of described PNP triode connects described second electronic switch second end and the first electric capacity through the 6th resistance; When the first electronic switch is P-channel field-effect transistor (PEFT) pipe, the source electrode of described P-channel field-effect transistor (PEFT) pipe connects described second electronic switch second end and the first electric capacity through the 6th resistance.
Preferably, described operation power supply also connects chip power end VCC by isolating diode.
Preferably, described chip power end VCC is also by the second capacity earth.
Preferably, described startup power supply is the power supply after taking from rectification.
A kind of LCD TV, comprises above-mentioned low-power consumption start-up circuit.This low-power consumption start-up circuit comprises and starts power supply, runs power supply, chip, booster circuit and from breaking circuit; When starting LCD TV, described booster circuit, under described startup power supply excitation, boosts to chip power end VCC, bootrom; When after chip enable, described operation power supply is powered to chip power end VCC, describedly closes described booster circuit from breaking circuit, and LCD TV is normally run.
Compared with prior art, advantage of the present utility model and good effect are: low-power consumption start-up circuit of the present utility model, its booster circuit is compared with the external high-tension circuit of chip, greatly reduce the high-voltage power loss of circuit, and the power end of chip can be made faster to boost, reach chip enable required voltage.After chip enable, by operation power supply continued power, close start-up circuit from breaking circuit simultaneously.Like this, start power supply and be cut off, reduce power loss.Specific to LCD TV field, some chip in LCD TV is without high-voltage starting circuit, and such as power factor correction PFC (Power Factor Correction) chip, must by the form of circuit dividing potential drop directly from power taking high voltage.But when normally working, this circuit has electric current to pass through, thus increases power loss always.In order to reduce power consumption, then to strengthen resistance in circuit, but make chip voltage rise to operating voltage with regard to needing for a long time like this, reduce chip enable efficiency, have impact on properties of product.This low-power consumption start-up circuit is connected on the chip without start-up circuit, can pass through booster circuit bootrom quickly, and after chip enable, by turning off start-up circuit from breaking circuit, while raising chip enable efficiency, reduces power loss.
Accompanying drawing explanation
Fig. 1 is the structure chart of the better embodiment of the utility model low-power consumption start-up circuit.
Fig. 2 is the chip power terminal voltage variation diagram of the utility model low-power consumption start-up circuit.
Fig. 3 is the circuit diagram of the better embodiment of the utility model low-power consumption start-up circuit.
Fig. 4 is the circuit diagram of the better embodiment of the utility model low-power consumption start-up circuit.
Main element symbol description:
| Resistance | R1-R12 |
| PNP triode | Q1 |
| NPN triode | Q2、Q3 |
| P-channel field-effect transistor (PEFT) pipe | Q4 |
| N channel field-effect pipe | Q5、Q6 |
| Electric capacity | C1-C4 |
| Voltage stabilizing didoe | DW1、DW2 |
| Diode | D1、D2 |
| Chip power end | VCC |
Embodiment
For making the purpose of this utility model, feature becomes apparent, and be further described, but the utility model can realize by different forms, should not think and just be confined to described embodiment below in conjunction with accompanying drawing to embodiment of the present utility model.
As shown in Figure 1, the present embodiment provides a kind of low-power consumption start-up circuit.Without self-start circuit in described chip, such as, it is power factor correction PFC (Power Factor Correction) chip.Without start-up circuit in PFC chip, just need by the form of circuit dividing potential drop directly from power taking high voltage.After startup PFC chip, this circuit has electric current to pass through always, thus increases power loss.In order to reduce power loss, then to strengthen resistance in circuit, but make chip voltage rise to operating voltage with regard to needing for a long time like this, reduce chip enable efficiency, have impact on properties of product.And low-power consumption start-up circuit of the present utility model overcomes above-mentioned defect, its booster circuit, under described startup power supply excitation, boosts to chip power end VCC, bootrom; When after chip enable, described operation power supply is powered to chip power end VCC, describedly closes described booster circuit from breaking circuit.Booster circuit, compared with the external high-tension circuit of chip, greatly reduces the high-voltage power loss of circuit, and the power end of chip can be made faster to boost, and reaches chip enable required voltage.After chip enable, by operation power supply continued power, close start-up circuit from breaking circuit simultaneously, cut off and start power supply.It can thus be appreciated that this low-power consumption start-up circuit reduces power loss while raising chip enable efficiency.
As shown in Figure 2 and Figure 3, the present embodiment chip adopts PFC chip, and without self-start circuit in this PFC chip, run power supply and connect PFC chip power end VCC by isolating diode D1, PFC chip power end VCC is by electric capacity C2 ground connection.Low-power consumption start-up circuit described in the utility model comprises booster circuit and from breaking circuit two parts.Wherein, booster circuit comprises the element such as PNP triode Q1, NPN triode Q2.Concrete, startup power supply through over commutation passes through the emitter that resistance R1 connects PNP triode Q1, the collector electrode of PNP triode Q1 connects PFC chip power end VCC, the base stage of PNP triode Q1 connects collector electrode and electric capacity C1 one end of NPN triode Q2 by resistance R6, the base stage of NPN triode Q2 connects PFC chip power 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.The elements such as NPN triode Q3 are comprised from breaking circuit.Concrete, the collector electrode of NPN triode Q3 connects PFC chip power end VCC by resistance R3, the grounded emitter of NPN triode Q3, PFC chip power end VCC is by voltage-stabiliser tube DW1 and resistance R4 ground connection, and the base stage of NPN triode Q3 is connected between voltage-stabiliser tube DW1 and resistance R4 by resistance R5.Within the 0-T1 time, now the supply voltage of chip power end VCC changes from zero to U1.During this period of time, start source current through the collector electrode of resistance R1, Q1, the base stage of Q1 and resistance R6 to electric capacity C1, charge to give electric capacity C1.Like this, Q1 conducting makes to start power supply and charges to VCC, and VCC voltage rises gradually.The lasting rising of VCC voltage, makes Q2 base stage trigger Q2 conducting, Q1 base level is dragged down, thus ensure that the constant conduction of Q1, and it is VCC charging constantly that startup power supply is continued.When VCC voltage is elevated to U2 position, makes voltage-stabiliser tube DW1 conducting, and make Q3 conducting, now the base current of Q2 is cut off, and Q2 is turned off, and then also turns off Q1.Now the voltage of VCC is stabilized in U2, as in the T2-T3 time in Fig. 2.The voltage of U2 is greater than PFC chip cut-in voltage, and chip is started working, and operation power supply is that the VCC of chip powers, and chip normally works.Wherein, the voltage running power supply is greater than the voltage of U2.After chip normally works, Q3 is conducting all the time, and Q2 closes all the time, Q1 thus be also just turned off.Like this, just have turned off start-up circuit, thus reduce power consumption.In the present embodiment, R1 is current-limiting resistance, and when starting, electric current charges to VCC through R1; R2 is current-limiting resistance, for limiting the electric current flowing to Q2 base stage through VCC; R3 is current-limiting resistance, for limiting the electric current flowing to Q3; This circuit, in R2 and R3, only can retain R3, makes R3 also play the effect of R2; R4 is the electric leakage absorption resistance of voltage-stabiliser tube DW1, and can guarantee, when voltage-stabiliser tube DW1 conducting, to guarantee the conducting of Q3; R5 is current-limiting resistance, for limiting the electric current flowing to Q3 base stage; R6 is current-limiting resistance, the electric current of restriction Q1 base stage, and forms charging circuit, to provide enough charging currents with C1; C1 is electric capacity, forms RC filter circuit together with R6, makes Q1 have time enough to charge to VCC, VCC voltage is raised and triggers Q2 conducting; C2 is electric capacity, plays the effect into power filter; DW1 is voltage-stabiliser tube, setting voltage value, and when VCC voltage is elevated to now, voltage-stabiliser tube DW1 conducting, makes Q3 conducting, and now the base current of Q2 is cut off, and Q2 is turned off, and then also turns off Q1; D1 is isolating diode, for isolating operation power supply, preventing circuit to the interference running power supply, running to make operation power good.The power end VCC of PFC chip can boost by the booster circuit of this programme low-power consumption start-up circuit quickly, and starts PFC chip.By operation power supply continued power after PFC chip enable, close booster circuit from breaking circuit and start power supply to cut off, thus reduce power loss, improve properties of product.
As shown in Figure 2, Figure 4 shows, the present embodiment chip adopts PFC chip, and without self-start circuit in this PFC chip, run power supply and connect PFC chip power end VCC by isolating diode D2, PFC chip power end VCC is by electric capacity C4 ground connection.
Low-power consumption start-up circuit described in the utility model comprises booster circuit and from breaking circuit two parts.Wherein, booster circuit comprises the elements such as P-channel field-effect transistor (PEFT) pipe Q4, N channel field-effect pipe Q5.Concrete, startup power supply through over commutation passes through the source electrode that resistance R7 connects P-channel field-effect transistor (PEFT) pipe Q4, the drain electrode of P-channel field-effect transistor (PEFT) pipe Q4 connects PFC chip power end VCC, the source electrode of P-channel field-effect transistor (PEFT) pipe Q4 connects the grid of N channel field-effect pipe Q4, the drain electrode of N channel field-effect pipe Q5 and electric capacity C3 one end by resistance R12, the grid of N channel field-effect pipe Q5 connects PFC chip power end VCC through resistance R8, the source ground of N channel field-effect pipe Q5, drain electrode and the source electrode of N channel field-effect pipe Q5 are connected the two ends of electric capacity C3 respectively.The elements such as N channel field-effect pipe Q6 are comprised from breaking circuit.Concrete, the drain electrode of N channel field-effect pipe Q6 connects PFC chip power end VCC by resistance R9, N channel field-effect pipe Q6 source ground, PFC chip power end VCC is by voltage-stabiliser tube DW2 and resistance R10 ground connection, and the grid of N channel field-effect pipe Q6 is connected between voltage-stabiliser tube DW5 and resistance R10 by resistance R11.Within the 0-T1 time, now the power supply of chip power end VCC changes from zero to U1.During this period of time, start source current through R7, R12 to C3, to charge to C3.Like this, the GS voltage of Q4 is reverse-biased, makes Q4 conducting, and make to start power supply and charge to VCC, VCC voltage rises gradually.The lasting rising of VCC voltage, makes Q5 conducting, makes the GS voltage of Q4 always reverse-biased, thus ensure that the constant conduction of Q1, and it is VCC charging constantly that startup power supply is continued.When VCC voltage is elevated to U2 position, makes voltage-stabiliser tube DW2 conducting, and make Q6 conducting, now the grid level of Q5 is dragged down, and Q5 is turned off, and then also turns off Q4.Now the voltage of VCC is stabilized in U2, as in the T2-T3 time in Fig. 2.The voltage of U2 is greater than PFC chip cut-in voltage, and chip is started working, and operation power supply is that the VCC of chip powers, and chip normally works.Wherein, the voltage running power supply is greater than the voltage of U2.After chip normally works, Q6 is conducting all the time, and Q5 closes all the time, Q4 thus be also just turned off.Like this, just have turned off start-up circuit, thus reduce power consumption.In the present embodiment, R7 is current-limiting resistance, and when starting, electric current charges to VCC through R7; R8 is current-limiting resistance, for limiting the electric current flowing to Q5 base stage through VCC; R9 is current-limiting resistance, for limiting the electric current flowing to Q6; This circuit, in R8 and R9, only can retain R9, makes R9 also play the effect of R8; R10 is the electric leakage absorption resistance of voltage-stabiliser tube DW2, and can guarantee, when voltage-stabiliser tube DW2 conducting, to guarantee the conducting of Q6; R11 is current-limiting resistance, for limiting the electric current flowing to Q6 grid; R12 is current-limiting resistance, forms charging circuit, to provide enough charging currents with C3; C3 is electric capacity, forms RC filter circuit together with R12, makes Q4 have time enough to charge to VCC, VCC voltage is raised and triggers Q5 conducting; C4 is electric capacity, plays the effect into power filter; DW2 is voltage-stabiliser tube, setting voltage value, and when VCC voltage is elevated to now, voltage-stabiliser tube DW2 conducting, makes Q6 conducting, and now the grid voltage of Q5 is cut off, and Q5 is turned off, and then also turns off Q4; D2 is isolating diode, for isolating operation power supply, preventing circuit to the interference running power supply, running to make operation power good.The power end VCC of PFC chip can boost by the booster circuit of this programme low-power consumption start-up circuit quickly, and starts PFC chip.By operation power supply continued power after PFC chip enable, close booster circuit from breaking circuit and start power supply to cut off, thus reduce power loss, improve properties of product.
The utility model also provides a kind of LCD TV, comprises above-mentioned low-power consumption start-up circuit.
Obviously, those skilled in the art can carry out various change and modification to utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (10)
1. a low-power consumption start-up circuit, is characterized in that, comprising:
Start power supply, run power supply, chip, booster circuit and from breaking circuit;
Described booster circuit, under described startup power supply excitation, boosts to chip power end VCC, bootrom;
When after chip enable, described operation power supply is powered to chip power end VCC, describedly closes described booster circuit from breaking circuit.
2. low-power consumption start-up circuit as claimed in claim 1, is characterized in that: described booster circuit, comprises the first electronic switch and the second electronic switch; Described startup power supply connects the second end of described first electronic switch, chip power end VCC described in the three-terminal link of described first electronic switch, the first end of described first electronic switch connects the second end of described second electronic switch, described second electronic switch first end connects described chip power end VCC, 3rd end ground connection of described second electronic switch, the second end and the 3rd end of described second electronic switch are connected the two ends of the first electric capacity respectively.
3. low-power consumption start-up circuit as claimed in claim 1, is characterized in that: described from breaking circuit, comprises the 3rd electronic switch; Described 3rd electronic switch second end connects described chip power end VCC, described 3rd electronic switch the 3rd end ground connection, and described chip power end VCC passes through the first voltage-stabiliser tube ground connection, described 3rd electronic switch first end ground connection.
4. low-power consumption start-up circuit as claimed in claim 2, it is characterized in that: described first electronic switch is PNP triode, its base stage, emitter and collector electrode be the first end of corresponding first electronic switch, the second end and the 3rd end respectively, or the first electronic switch is P-channel field-effect transistor (PEFT) pipe, its grid, source electrode and drain first end, the second end and the 3rd end of distinguishing corresponding first electronic switch, and source electrode is connected with grid; Described second electronic switch is NPN triode, its base stage, collector electrode and emitter be the first end of corresponding second electronic switch, the second end and the 3rd end respectively, or the second electronic switch is N channel field-effect pipe, its grid, drain electrode and source electrode be the first end of corresponding first electronic switch, the second end and the 3rd end respectively.
5. low-power consumption start-up circuit as claimed in claim 4, it is characterized in that: also comprise the first resistance and the second resistance, described startup power supply connects the second end of described first electronic switch through the first resistance, and described second electronic switch first end connects described chip power end VCC through the second resistance.
6. low-power consumption start-up circuit as claimed in claim 3, it is characterized in that: described 3rd electronic switch is NPN triode, its base stage, collector electrode and emitter be the first end of corresponding 3rd electronic switch, the second end and the 3rd end respectively, or the 3rd electronic switch is N channel field-effect pipe, its grid, drain electrode and source electrode be the first end of corresponding 3rd electronic switch, the second end and the 3rd end respectively.
7. low-power consumption start-up circuit as claimed in claim 6, it is characterized in that: also comprise the 3rd resistance, the 4th resistance and the 5th resistance, described 3rd electronic switch second end connects described chip power end VCC by the 3rd resistance, described chip power end VCC is by the first voltage-stabiliser tube and the 4th grounding through resistance, and described 3rd electronic switch first end is connected between described first voltage-stabiliser tube and described 4th resistance by the 5th resistance.
8. low-power consumption start-up circuit as claimed in claim 4, it is characterized in that: also comprise the 6th resistance, when described first electronic switch is PNP triode, the base stage of described PNP triode connects described second electronic switch second end and the first electric capacity through the 6th resistance; When the first electronic switch is P-channel field-effect transistor (PEFT) pipe, the source electrode of described P-channel field-effect transistor (PEFT) pipe connects described second electronic switch second end and the first electric capacity through the 6th resistance.
9. the low-power consumption start-up circuit as described in any one of claim 1 to 8, is characterized in that: described operation power supply also connects chip power end VCC by isolating diode.
10. a LCD TV, is characterized in that: comprise low-power consumption start-up circuit as claimed in any one of claims 1-9 wherein.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420640298.8U CN204190851U (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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| Application Number | Priority Date | Filing Date | Title |
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| CN201420640298.8U CN204190851U (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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| CN204190851U true CN204190851U (en) | 2015-03-04 |
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| CN201420640298.8U Active CN204190851U (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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333722A (en) * | 2014-10-30 | 2015-02-04 | 青岛歌尔声学科技有限公司 | Low power consumption starting circuit and liquid crystal television |
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2014
- 2014-10-30 CN CN201420640298.8U patent/CN204190851U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333722A (en) * | 2014-10-30 | 2015-02-04 | 青岛歌尔声学科技有限公司 | Low power consumption starting circuit and liquid crystal television |
| CN104333722B (en) * | 2014-10-30 | 2017-07-07 | 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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