CN101801150B - Quick starting power supply for power chip - Google Patents
Quick starting power supply for power chip Download PDFInfo
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- CN101801150B CN101801150B CN 200910247473 CN200910247473A CN101801150B CN 101801150 B CN101801150 B CN 101801150B CN 200910247473 CN200910247473 CN 200910247473 CN 200910247473 A CN200910247473 A CN 200910247473A CN 101801150 B CN101801150 B CN 101801150B
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Abstract
The invention relates to a quick starting power supply for a power chip, which comprises a bias current circuit, an initial voltage circuit, a voltage modulation circuit, a current mirror circuit and a logic control circuit which are in circuit connection with each other. Since quick starting voltage is introduced in the power chip, when power is on, the logic inside the power chip can be correctly realized. Under the starting and normal working states, a composite power supply can automatically switch between the quick starting voltage and output voltage of an internal circuit. With the ability of quick starting when power is on, the composite power supply can correctly initialize the power chip before the power-on reset signals are in high level, and after the power-on reset signals are in high level, the composite power supply can stably supply power to the logic circuit and the control circuit in the power chip.
Description
Technical field
The present invention relates to a kind of quick starting power supply for power chip, relate in particular to a kind of quick starting power supply for AC-DC electricity-saving lamp power chip.
Background technology
In AC-DC electricity-saving lamp power chip, the interchange of 220V input is unique power supply.Behind over commutation and filter circuit, a High Level DC Voltage (VHV) is used to drive chip and electricity-saving lamp.At chip internal, all logics and control circuit all are made of the CMOS (complementary metal oxide semiconductors (CMOS)) of low pressure.Convert the dc high voltage (VHV) of outside input to DC low-voltage (VREG) so have an internal electric source (Linear Regulator) in the chip, in order to be used for to logic and control circuit power supply.Stable and reduce the transient voltage fluctuation for the loop that makes internal electric source, a big external capacitive can be connected the output of internal electric source.Because the existence of this big electric capacity is arranged, and the feedback loop of internal capacitance has obtained good compensation, and the fluctuation of transient voltage also can be filtered.Thus, the stable and load regulation and control of internal electric source are guaranteed by external big electric capacity.
On the other hand, the existence of outside big electric capacity can prolong the start-up time of chip when powering on.When electrifying startup, the magnitude of voltage that internal electric source need charge and set until arrival the big electric capacity in outside very long a period of time.Generally speaking, whole startup need spend a hundreds of microsecond.Some internal logic and control circuit need be powered when powering at once in order to chip is carried out initialization.But, because the slow start characteristic of internal electric source can not be powered at once once powering on.Therefore, just need the power circuit that can start fast before internal electric source starts fully, chip to be carried out correct initialization.
Summary of the invention
The invention provides a kind of quick starting power supply for power chip, can before internal electric source starts fully, carry out correct initialization to chip, make the logic of chip internal can obtain correct realization.
In order to achieve the above object, the invention provides a kind of quick starting power supply for power chip, comprise bias current circuit, initial voltage circuit, voltage modulation circuit, current mirroring circuit and logic control circuit that circuit connects;
Described bias current circuit connects described initial voltage circuit, voltage modulation circuit and current mirroring circuit by circuit, for initial voltage circuit, voltage modulation circuit and current mirroring circuit provide electric current, this bias current circuit is to provide bias current by PTAT (the proportional to absolutetemperature positive temperature coefficient electric current) electric current that reference voltage circuit generates;
Described initial voltage circuit comprises the P-channel metal-oxide-semiconductor pipe of the grid leak end short circuit of some series connection, this initial voltage circuit provides electric current by bias current circuit, and generate initial voltage and be input to voltage modulation circuit, the numerical value of initial voltage equals the output voltage of internal circuit;
Described voltage modulation circuit comprises boost device and the decompression device that circuit connects, and boost device and decompression device boost earlier to initial voltage, carry out step-down again, obtain quick starting voltage, and this quick starting voltage is outputed to logic control circuit;
Described current mirroring circuit offers logic control circuit with the electric current that bias current circuit produces;
Described logic control circuit is imported the output voltage of quick starting voltage and internal circuit respectively, the final composite power source of this logic control circuit output;
The power-on reset signal that electrify restoration circuit produces is a built-in signal, is used for indicating the operation interval of power chip, this reset signal input logic control circuit, when electrifying startup, power-on reset signal is low level, and when operate as normal, power-on reset signal is high level; When the power-on reset signal of input was low level, composite power source was shorted to quick starting voltage, and when power-on reset signal was high level, composite power source was shorted to the output voltage of internal circuit.
Before power-on reset signal uprises, have only the in running order so that correct initialization of chip of minority logic and control circuit, so quick starting voltage does not need the load current that provides very big.After power-on reset signal uprises, all logics and control circuit all will enter operating state, and it is big that loading demand will become.
The present invention is owing to introduced quick starting voltage in power chip, when powering on, the logic of power chip inside can obtain correct realization.Composite power source can switch between the output voltage of quick starting voltage and internal circuit under startup and normal operating conditions automatically.The ability that can start fast when powering on has been arranged, the initialization power chip that composite power source is can be before power-on reset signal uprises correct, after power-on reset signal uprised, composite power source carried out stable power supply can for again logical circuit and control circuit in the power chip.
Description of drawings
Fig. 1 is the circuit diagram of a kind of quick starting power supply for power chip provided by the invention.
Embodiment
Following according to Fig. 1, specify preferred embodiment of the present invention:
As shown in Figure 1, be the circuit diagram of the quick starting power supply that is used for power chip;
Grid end offset MP7 and PMOS (P-channel metal-oxide-semiconductor) pipe MP8, MP9, MP10 form bias current circuit, this grid end offset MP7 and PMOS pipe MP8, MP9, MP10 provide bias current by the PTAT electric current that reference voltage circuit (Bandgap) generates, described reference voltage circuit is directly powered by dc high voltage VHV, can start fast, in order to the PTAT electric current is provided in power up;
The PMOS pipe MP1～MPX of the grid leak end short circuit of some series connection forms the initial voltage circuit, this initial voltage circuit provides electric current by the MP8 in the bias current circuit, and generate initial voltage V1 and be input to voltage modulation circuit, the numerical value of V1 is 3.3V or 5V, near the output voltage V REG of internal circuit;
NMOS (N NMOS N-channel MOS N) pipe MN1 and MN2 form voltage modulation circuit, the device MN1 that boosts promotes a gate source voltage VGS MN1 with initial voltage V1, obtain voltage V2, decompression device MN2 reduces a gate source voltage VGS MN2 with V2 again, obtain quick starting voltage VPRE, VPRE outputs to logic control circuit with this quick starting voltage;
Because the source end of MN2 is a low-impedance point, so quick starting voltage VPRE just can be used to when electrifying startup power chip be carried out initialization;
The magnitude of voltage of quick starting voltage VPRE is defined as follows:
VPRE＝V1+VGS_MN1-VGS_MN2；
Follow the load current according to quick starting voltage VPRE, process deviation, concrete conditions such as temperature drift, by adjusting MN1, the bias current I2 of the size of MN2 and MN1, quick starting voltage VPRE can be no better than initial voltage V1, and near the output voltage V REG of internal circuit;
MN4, MN5 and MP6 form current mirroring circuit the PTAT electric current that bias current circuit produces are offered logic control circuit;
NMOS manages MN3, PMOS manages MP3, reverser INV1 and INV2, switch P metal-oxide-semiconductor MP4 and MP5 form logic control circuit, the power-on reset signal POR that the gate terminal input electrify restoration circuit of MN3 provides, the drain electrode end input quick starting voltage VPRE of MP4, the output voltage V REG of the drain electrode end input internal circuit of MP5, the final composite power source VDD of source class end output of MP4 and MP5; When power-on reset signal POR was 0, the leakage level terminal voltage V3 of MN3 was lifted to 1, and the output signal PWR_NRDY of reverser INV2 is 1, the output signal PWR_RDY of reverser INV1 is 0, MP4 conducting and MP5 ends, so composite power source VDD is shorted to quick starting voltage VPRE, when POR is 1, V3 is pulled down to 0, signal PWR_NRDY is 0, and signal PWR_RDY is 1, MP5 conducting, and MP4 ends, and VDD is shorted to VREG.
Power-on reset signal POR is a built-in signal, is used for indicating the operation interval of power chip.When electrifying startup, POR is low level, and when operate as normal, POR is high level.Before POR uprises, have only the in running order so that correct initialization of chip of minority logic and control circuit, so quick starting voltage VPRE does not need the load current that provides very big.After POR uprises, all logics and control circuit all will enter operating state, and it is big that loading demand will become.
Described logic control circuit is powered by quick starting voltage VPRE, and other logical circuits and control circuit in the power chip are all powered by composite power source VDD;
Owing to introduced quick starting voltage VPRE in power chip, when powering on, the logic of power chip inside can obtain correct realization.Composite power source VDD can switch between the output voltage V REG of quick starting voltage VPRE and internal circuit under startup and normal operating conditions automatically.The ability that can start fast when powering on has been arranged, the initialization power chip that composite power source VDD is can be before power-on reset signal POR uprises correct, after power-on reset signal POR uprised, composite power source VDD carried out stable power supply can for again logical circuit and control circuit in the power chip.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. a quick starting power supply that is used for power chip is characterized in that, comprises bias current circuit, initial voltage circuit, voltage modulation circuit, current mirroring circuit and logic control circuit that circuit connects;
Described bias current circuit connects described initial voltage circuit, voltage modulation circuit and current mirroring circuit by circuit, for initial voltage circuit, voltage modulation circuit and current mirroring circuit provide electric current;
Described initial voltage circuit provides electric current by bias current circuit, and generation initial voltage V1 is input to voltage modulation circuit;
Described voltage modulation circuit comprises boost device and the decompression device that circuit connects, boost device and decompression device boosts earlier to initial voltage V1, carry out step-down again, obtain quick starting voltage VPRE, VPRE outputs to logic control circuit with this quick starting voltage;
Described current mirroring circuit offers logic control circuit with the electric current that bias current circuit produces;
Described logic control circuit comprises the N NMOS N-channel MOS N pipe MN3 that circuit connects, P-channel metal-oxide-semiconductor pipe MP3, reverser INV1 and INV2, switch P NMOS N-channel MOS N pipe MP4 and MP5;
Described logic control circuit is imported the output voltage V REG of quick starting voltage VPRE and internal circuit respectively, the final composite power source VDD of this logic control circuit output;
The power-on reset signal POR that electrify restoration circuit produces is a built-in signal, be used for indicating the operation interval of power chip, this reset signal POR input logic control circuit, when electrifying startup, power-on reset signal POR is low level, when operate as normal, power-on reset signal POR is high level; When the power-on reset signal POR of input was low level, composite power source VDD was shorted to quick starting voltage VPRE, and when power-on reset signal POR was high level, composite power source VDD was shorted to the output voltage V REG of internal circuit;
Described initial voltage circuit comprises the P-channel metal-oxide-semiconductor pipe MP1～MPX of the grid leak end short circuit of some series connection.
2. the quick starting power supply for power chip as claimed in claim 1 is characterized in that, described bias current circuit is to provide bias current by the positive temperature coefficient electric current that reference voltage circuit generates.
3. the quick starting power supply for power chip as claimed in claim 2 is characterized in that, described reference voltage circuit is directly powered by dc high voltage VHV, can start fast, in order to PTAT positive temperature coefficient electric current is provided in power up.
4. the quick starting power supply for power chip as claimed in claim 1 is characterized in that, the numerical value of described initial voltage V1 equals the output voltage V REG of internal circuit.
5. the quick starting power supply for power chip as claimed in claim 1 is characterized in that, the described device that boosts adopts N NMOS N-channel MOS N pipe MN1, and described decompression device adopts N NMOS N-channel MOS N pipe MN2;
The device MN1 that boosts promotes a gate source voltage VGS_MN1 with initial voltage V1, obtain voltage V2, decompression device MN2 reduces a gate source voltage VGS_MN2 with V2 again, obtains quick starting voltage VPRE, and VPRE outputs to logic control circuit with this quick starting voltage.
6. the quick starting power supply for power chip as claimed in claim 5 is characterized in that, the magnitude of voltage of described quick starting voltage VPRE is defined as follows:
VPRE＝V1+VGS_MN1-VGS_MN2。
7. the quick starting power supply for power chip as claimed in claim 6 is characterized in that, described quick starting voltage VPRE equals initial voltage V1.
8. the quick starting power supply for power chip as claimed in claim 1, it is characterized in that, the power-on reset signal POR that the gate terminal input electrify restoration circuit of MN3 provides, the drain electrode end input quick starting voltage VPRE of MP4, the output voltage V REG of the drain electrode end input internal circuit of MP5, the final composite power source VDD of source class end output of MP4 and MP5; When power-on reset signal POR was 0, the leakage level terminal voltage V3 of MN3 was lifted to 1, and the output signal PWR_NRDY of reverser INV2 is 1, the output signal PWR_RDY of reverser INV1 is 0, MP4 conducting and MP5 ends, so composite power source VDD is shorted to quick starting voltage VPRE, when POR is 1, V3 is pulled down to 0, signal PWR_NRDY is 0, and signal PWR_RDY is 1, MP5 conducting, and MP4 ends, and composite power source VDD is shorted to VREG.
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| CN 200910247473 CN101801150B (en) | 2009-12-29 | 2009-12-29 | Quick starting power supply for power chip |
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| CN 200910247473 CN101801150B (en) | 2009-12-29 | 2009-12-29 | Quick starting power supply for power chip |
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| CN101801150B true CN101801150B (en) | 2013-08-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102097927B (en) * | 2011-01-18 | 2013-11-27 | Bcd半导体制造有限公司 | Starting circuit of switch power supply chip and starting method of starting circuit |
| TWI435201B (en) * | 2011-03-07 | 2014-04-21 | Realtek Semiconductor Corp | Signal generating apparatus for generating power-on-reset signal |
| CN105892610A (en) * | 2016-04-11 | 2016-08-24 | 浪潮电子信息产业股份有限公司 | Small current load switch chip of server daughter board card |
| CN106354189B (en) * | 2016-10-27 | 2017-09-29 | 厦门新页微电子技术有限公司 | A kind of Low threshold with lag function enables circuit |
| IT202000006109A1 (en) * | 2020-03-23 | 2021-09-23 | St Microelectronics Srl | START-UP RESET CIRCUIT WITH IMPROVED ELECTRICAL FEATURES AND CORRESPONDING ELECTRONIC DEVICE |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227780A (en) * | 2008-01-28 | 2008-07-23 | 缪复华 | LED lamp set drive power supply device |
| CN101398142A (en) * | 2007-09-28 | 2009-04-01 | 深圳市比克电池有限公司 | Power supply system applying to LED |
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| FR2860307B1 (en) * | 2003-09-26 | 2005-11-18 | Atmel Grenoble Sa | INTEGRATED CIRCUIT WITH AUTOMATIC STARTING FUNCTION |
| CN201590935U (en) * | 2009-12-29 | 2010-09-22 | 灿芯半导体(上海)有限公司 | Quick starting power |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101398142A (en) * | 2007-09-28 | 2009-04-01 | 深圳市比克电池有限公司 | Power supply system applying to LED |
| CN101227780A (en) * | 2008-01-28 | 2008-07-23 | 缪复华 | LED lamp set drive power supply device |
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Effective date of registration: 20161012 Address after: 100176, No. 10, Ronghua Road, Beijing economic and Technological Development Zone, 9 floor, block A Patentee after: Brite Powerise (Beijing) Limited company of microelectronics technology Address before: 201203 Shanghai Zhangjiang hi tech Park Cailun Road 2 Building No. 501 room 1690 Patentee before: Brite Semiconductor (Shanghai) Corporation |