CN105138062A - System improving load regulation rate of low-pressure-difference linear voltage regulator - Google Patents
System improving load regulation rate of low-pressure-difference linear voltage regulator Download PDFInfo
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- CN105138062A CN105138062A CN201410234252.0A CN201410234252A CN105138062A CN 105138062 A CN105138062 A CN 105138062A CN 201410234252 A CN201410234252 A CN 201410234252A CN 105138062 A CN105138062 A CN 105138062A
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Abstract
A system improving the load regulation rate of a low-pressure-difference linear voltage regulator specifically relates to a circuit system, and comprises a linear voltage stabilizing circuit which generates output voltage to a controlled load, and a control circuit which controls the output of a first control signal to the linear voltage stabilizing circuit and controllably outputs a second control signal to the controlled load at a predetermined time after corresponding generation of the first control signal. The controlled load changes work current when controlled by the second control signal. The linear voltage stabilizing circuit comprises a referential voltage generation circuit which generates at least two referential voltages with different voltage values, an adjusting unit which selectively connects with one path of the at least two referential voltage under the effect of first control signals, and the current of the output voltage is adjusted under the effect of referential voltage to stabilize output voltage. Before the controlled load is changed, the output voltage of the linear voltage stabilizing circuit is changed, the load adjusting rate is changed, and the system stability is ensured.
Description
Technical field
The present invention relates to electronic technology field, be specifically related to a kind of Circuits System.
Background technology
In order to adapt to the high speed development of electronics and the communication technology, multiple functional units in electronic equipment particularly portable electric appts such as audio frequency, illumination, communication, equipment control etc. usually need stable supply voltage, low pressure difference linear voltage regulator (LDO, LowDropoutregulator) compared to traditional three end fixed voltage voltage stabilizers, can realize that less input/output voltage is poor, circuit structure is simple, take printed circuit board area little, be used widely without advantages such as switching noises.Desirable power-supply system should have good system stability and load transient performance, output voltage is stable for circuit and load change, fixing output voltage can be provided, can not change because of time and temperature, wherein load regulation weighs the important parameter of low pressure difference linear voltage regulator mapping, what it was weighed is when input voltage is constant, the influence degree of load change to output voltage, a kind of common system architecture of prior art as shown in Figure 1, comprise a controlled load, one low pressure difference linear voltage regulator, one control circuit, system in the course of the work, when needs increase by controlled load works, control circuit directly transmits control signal to controlled load, low pressure difference linear voltage regulator provides output voltage to controlled load, the voltage-vs-time of existing system or the oscillogram of current-vs-time are as shown in Figure 2, the shortcoming that this control system exists is: the unexpected increase of controlled load can cause output voltage fluctuation larger, the steady operation of influential system.
Summary of the invention
The object of the invention is to, a kind of system improving low pressure difference linear voltage regulator load regulation is provided, solves above technical matters;
Technical matters solved by the invention can realize by the following technical solutions:
Improve the system of low pressure difference linear voltage regulator load regulation, wherein, comprise a linear voltage-stabilizing circuit, described linear voltage-stabilizing circuit produces output voltage and exports controlled load to; Also comprise a control circuit, described control circuit comprises:
First control signal output terminal, is connected with described linear voltage-stabilizing circuit, and controllablely exports the first control signal to described linear voltage-stabilizing circuit;
Second control signal output terminal, is connected with described controlled load, and the controllable schedule time after described first control signal generation accordingly exports the second control signal to described controlled load;
Described controlled load changes working current under described second control signal controls;
Described linear voltage-stabilizing circuit comprises:
One reference voltage generating circuit, for generation of at least two-way reference voltage with different magnitude of voltage;
One adjustment unit, the reference voltage that at least two-way has a different magnitude of voltage selectively provides a road reference voltage to described adjustment unit under described first control signal effect, described adjustment unit adjusts the size of current of described output voltage under the effect of described reference voltage, to stablize described output voltage.
Preferably, described adjustment unit comprises an error amplifier, described error amplifier is provided with first input end and the second input end, described first input end connects described reference voltage, described second input end connects a sampling voltage, described error amplifier compares with a sampling voltage described reference voltage, obtains an error amplification signal.
Preferably, described adjustment unit comprises a selector switch, the input end of described selector switch is connected with at least reference voltage described in two-way, the control end of described selector switch connects described first control signal, and under the effect of described first control signal, described in selection one tunnel, reference voltage exports described adjustment unit to.
Preferably, described linear voltage-stabilizing circuit comprises an Input voltage terminal, an output voltage terminal, an earth terminal; One Modulating Power pipe is series between described Input voltage terminal and described output voltage terminal; To connect between described output voltage terminal with described earth terminal an output capacitance.
Preferably, described Modulating Power pipe adopts the mos field effect transistor of P raceway groove, the grid of described mos field effect transistor connects described error amplification signal, the source electrode of described mos field effect transistor connects described Input voltage terminal, and the drain electrode of described mos field effect transistor connects described output voltage terminal.
Preferably, described sampling voltage is produced by a feedback network, and described feedback network is connected between described output voltage terminal and described earth terminal, in order to produce described sampling voltage.
Preferably, described feedback network is formed primarily of a resistor voltage divider circuit, described resistor voltage divider circuit comprises predetermined number and is connected in series with each other the divider resistance between described output voltage terminal and described earth terminal, and the point be connected between described divider resistance forms divider node; Described sampling voltage signal is drawn from predetermined divider node place.
Preferably, described output capacitance adopts aluminum capacitor or ceramic condenser.
Preferably, described control circuit, before the described controlled load of increase, produces described first control signal.
Beneficial effect: owing to adopting above technical scheme, the present invention is before change controlled load, and control linear stabilized circuit outputting voltage changes, make when load current generation transition, output voltage also can maintain in predetermined range of tolerable variance, can improve load regulation, guarantee system stability.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of prior art;
Fig. 2 is the oscillogram of the controlled load of prior art output voltage transient response and controlled load electric current when increasing suddenly;
Fig. 3 is system architecture schematic diagram of the present invention;
Fig. 4 is linear voltage-stabilizing circuit schematic diagram of the present invention;
Fig. 5 is the oscillogram of main signal of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
With reference to Fig. 3, Fig. 4, improve the system of low pressure difference linear voltage regulator load regulation, wherein, comprise a linear voltage-stabilizing circuit 1, linear voltage-stabilizing circuit 1 produces output voltage and exports controlled load 3 to; Also comprise a control circuit 2, control circuit 2 comprises:
First control signal output terminal, is connected with linear voltage-stabilizing circuit 1, and controllablely exports the first control signal s1 to linear voltage-stabilizing circuit 1;
Second control signal output terminal, be connected with controlled load 3, and the controllable schedule time after corresponding first control signal s1 produces exports the second control signal s2 to controlled load 3, controlled load 3 changes working current under the second control signal s2 controls;
Linear voltage-stabilizing circuit 1 comprises:
One reference voltage generating circuit, for generation of at least two-way reference voltage with different magnitude of voltage;
One adjustment unit, is selectively connected with at least two-way reference voltage Zhong mono-road reference voltage Vref, and under the effect of reference voltage V ref, adjusts the size of current of output voltage, with regulated output voltage under the first control signal s1 effect.
The present invention can before system needs increase or reduces controlled load 3, the reference voltage of control linear mu balanced circuit 1 changes, and make when load current generation transition, output voltage Vout also can maintain in predetermined range of tolerable variance, can load regulation be improved, guarantee system stability.
As a kind of preferred embodiment of the present invention, adjustment unit comprises an error amplifier 12, error amplifier 12 is provided with first input end and the second input end, first input end connects reference voltage V ref, second input end connects a sampling voltage Vfb, error amplifier 12 couples of reference voltage V ref compare with a sampling voltage Vfb, obtain an error amplification signal.In a kind of specific embodiment, first input end is inverting input (-), and the second input end is in-phase input end (+).
As a kind of preferred embodiment of the present invention, adjustment unit can comprise a selector switch 11, the input end of selector switch 11 is connected with at least two-way reference voltage, the control end of selector switch 11 connects the first control signal s1, and under the effect of the first control signal s1, selection one road reference voltage exports.Selector switch 11 can have multiple signal input part and a signal output part, and a signal input part connects a road reference voltage, and signal output part connects error amplifier 12, to provide reference voltage V ref to error amplifier 12.
As a kind of preferred embodiment of the present invention, linear voltage-stabilizing circuit 1 comprises an Input voltage terminal VDD, an output voltage terminal Vout, an earth terminal GND; One Modulating Power pipe 14 is series between Input voltage terminal VDD and output voltage terminal Vout; Connect between output voltage terminal Vout with earth terminal GND an output capacitance C1, and preferably, output capacitance C1 can adopt aluminum capacitor or ceramic condenser.
As a kind of preferred embodiment of the present invention, Modulating Power pipe 14 can adopt the mos field effect transistor of P raceway groove, the grid of mos field effect transistor connects error amplification signal, the source electrode of mos field effect transistor connects Input voltage terminal VDD, and the drain electrode of mos field effect transistor connects output voltage terminal Vout.Also can adopt the mos field effect transistor of N raceway groove to replace.
As a kind of preferred embodiment of the present invention, sampling voltage Vfb can be produced by a feedback network, and feedback network is connected between output voltage terminal Vout and earth terminal GND, in order to produce sampling voltage Vfb.
As a kind of preferred embodiment of the present invention, feedback network is formed primarily of a resistor voltage divider circuit, resistor voltage divider circuit comprises predetermined number and is connected in series with each other the divider resistance between output voltage terminal and earth terminal, and the point be connected between divider resistance forms divider node; Sampling voltage Vfb signal is drawn from predetermined divider node place.A kind of specific embodiment, feedback network 16 comprises the first resistance R1 and the second resistance R2, and the first resistance R1 and the second resistance R2 connects, and the point that sampling voltage Vfb is connected with the second resistance R2 from the first resistance R1 is drawn.
As a kind of preferred embodiment of the present invention, control circuit 2, before increase controlled load 3, produces the first control signal.
With reference to Fig. 4, a kind of specific embodiment, the present invention can comprise two reference voltages, be respectively the first reference voltage V ref1 and the second reference voltage V ref2, the magnitude of voltage of one of them reference voltage is greater than the magnitude of voltage of another reference voltage, if the first reference voltage V ref1 is 0.5V, second reference voltage V ref2 is 0.56V or 0.6V, when controlled load 3 needs to increase, by the reference voltage that the first control signal s1 control linear mu balanced circuit 1 Selection radio current base voltage is larger, the difference of error amplifier 12 benchmark voltage Vref and sampling voltage Vfb, produce the error voltage for controlling Modulating Power pipe 14, the On current of Modulating Power pipe 14 is flow through in adjustment, output voltage Vout is stablized.If sampling voltage Vfb is lower than reference voltage V ref, the grid voltage of Modulating Power pipe 14 is drop-down, thus allow more electric current to pass through and improve output voltage, if and sampling voltage Vfb is higher than reference voltage V ref, the grid of Modulating Power pipe 14 can be pulled up, thus less electric current is passed through and reduces output voltage.The object of the invention is to when load current generation transition, output voltage Vout also can maintain in predetermined range of tolerable variance, improves the transient response of circuit.
Oscillogram shown in composition graphs 5 can be found out, when adopting control system of the present invention that load can be made to increase, the fluctuation of linear voltage-stabilizing circuit 1 output voltage is less, improves load regulation, is conducive to the steady operation of system.
Reference voltage generating circuit of the present invention can be provided by bandgap voltage reference.Bandgap voltage reference, because having low temperature coefficient, high PSRR, the stability advantage such as good, is widely adopted.The reference voltage had nothing to do with power supply, technique, temperature is produced by bandgap voltage reference.
As a kind of preferred embodiment of the present invention, before the second control signal output terminal exports the second control signal s2 to controlled load 3, the first control signal s1 output terminal exports the first control signal s1 to linear voltage-stabilizing circuit 1.Namely the second control signal s2 compares the delay that the first control signal s1 has a setting-up time, before ensureing controlled load 3 connecting system, and the corresponding change of output voltage Vout.
As a kind of preferred embodiment of the present invention, Modulating Power pipe 14 of the present invention adopts the mos field effect transistor of an enhancement mode.
The present invention can be applied in portable set, portable set usually needs to arrange multiple low pressure difference linear voltage regulator, to provide each functional units such as audio frequency, illumination, communication, equipment control respectively, along with the needs of expanding of system function, Special low-voltage difference linear constant voltage regulator must be increased at the later stage of system development in prior art to power to various option, as camera model, bluetooth, WiFi and other link block.The present invention can be implemented in do not increase low pressure difference linear voltage regulator quantity basis on, realize the normal table work of system.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection domain is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilizations instructions of the present invention and diagramatic content and apparent change obtain in protection scope of the present invention.
Claims (9)
1. improve the system of low pressure difference linear voltage regulator load regulation, it is characterized in that, comprise a linear voltage-stabilizing circuit, described linear voltage-stabilizing circuit produces output voltage and exports controlled load to; Also comprise a control circuit, described control circuit comprises:
First control signal output terminal, is connected with described linear voltage-stabilizing circuit, and controllablely exports the first control signal to described linear voltage-stabilizing circuit;
Second control signal output terminal, is connected with described controlled load, and the controllable schedule time after described first control signal generation accordingly exports the second control signal to described controlled load;
Described controlled load changes working current under described second control signal controls;
Described linear voltage-stabilizing circuit comprises:
One reference voltage generating circuit, for generation of at least two-way reference voltage with different magnitude of voltage;
One adjustment unit, the reference voltage that at least two-way has a different magnitude of voltage selectively provides a road reference voltage to described adjustment unit under described first control signal effect, described adjustment unit adjusts the size of current of described output voltage under the effect of described reference voltage, to stablize described output voltage.
2. the system improving low pressure difference linear voltage regulator load regulation according to claim 1, it is characterized in that, described adjustment unit comprises an error amplifier, described error amplifier is provided with first input end and the second input end, described first input end connects described reference voltage, described second input end connects a sampling voltage, and described error amplifier compares with a sampling voltage described reference voltage, obtains an error amplification signal.
3. the system improving low pressure difference linear voltage regulator load regulation according to claim 1, it is characterized in that, described adjustment unit comprises a selector switch, the input end of described selector switch is connected with at least reference voltage described in two-way, the control end of described selector switch connects described first control signal, and under the effect of described first control signal, described in selection one tunnel, reference voltage exports described adjustment unit to.
4. the system improving low pressure difference linear voltage regulator load regulation according to claim 2, is characterized in that, described linear voltage-stabilizing circuit comprises an Input voltage terminal, an output voltage terminal, an earth terminal; One Modulating Power pipe is series between described Input voltage terminal and described output voltage terminal; To connect between described output voltage terminal with described earth terminal an output capacitance.
5. the system improving low pressure difference linear voltage regulator load regulation according to claim 4, it is characterized in that, described Modulating Power pipe adopts the mos field effect transistor of P raceway groove, the grid of described mos field effect transistor connects described error amplification signal, the source electrode of described mos field effect transistor connects described Input voltage terminal, and the drain electrode of described mos field effect transistor connects described output voltage terminal.
6. the system improving low pressure difference linear voltage regulator load regulation according to claim 4, it is characterized in that, described sampling voltage is produced by a feedback network, and described feedback network is connected between described output voltage terminal and described earth terminal, in order to produce described sampling voltage.
7. the system improving low pressure difference linear voltage regulator load regulation according to claim 6, it is characterized in that, described feedback network is formed primarily of a resistor voltage divider circuit, described resistor voltage divider circuit comprises predetermined number and is connected in series with each other the divider resistance between described output voltage terminal and described earth terminal, and the point be connected between described divider resistance forms divider node; Described sampling voltage signal is drawn from predetermined divider node place.
8. the system improving low pressure difference linear voltage regulator load regulation according to claim 4, is characterized in that, described output capacitance adopts aluminum capacitor or ceramic condenser.
9. the system improving low pressure difference linear voltage regulator load regulation according to claim 1, is characterized in that, described control circuit, before described controlled load increases, produces described first control signal.
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| CN201410234252.0A CN105138062B (en) | 2014-05-29 | 2014-05-29 | Improve the system of low pressure difference linear voltage regulator load regulation |
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| CN106249795A (en) * | 2016-08-31 | 2016-12-21 | 电子科技大学 | A kind of LDO circuit of output of floating |
| CN106300965A (en) * | 2016-11-16 | 2017-01-04 | 电子科技大学 | A kind of booster power LDO electric power system based on load supplying |
| CN107102680A (en) * | 2017-07-04 | 2017-08-29 | 何金昌 | A kind of low noise low pressure difference linear voltage regulator |
| CN107368139A (en) * | 2017-07-29 | 2017-11-21 | 何金昌 | Low-noise LDO (low dropout regulator) of integrated chip circuit |
| CN107621847A (en) * | 2017-09-19 | 2018-01-23 | 中颖电子股份有限公司 | One kind pull-up accelerating circuit |
| CN108880194A (en) * | 2018-06-22 | 2018-11-23 | 上海艾为电子技术股份有限公司 | A kind of voltage transmission circuit |
| CN109270978A (en) * | 2017-07-18 | 2019-01-25 | 中航（重庆）微电子有限公司 | Low-dropout linear voltage-regulating circuit, voltage regulation factor compensating unit and method |
| CN110134026A (en) * | 2019-06-06 | 2019-08-16 | 上海晶丰明源半导体股份有限公司 | A kind of low power consumpting controling circuit for intelligent appliance |
| CN111522385A (en) * | 2020-06-23 | 2020-08-11 | 上海安路信息科技有限公司 | Low dropout regulator of PMOS output power tube |
| CN111638745A (en) * | 2020-06-23 | 2020-09-08 | 上海安路信息科技有限公司 | Low dropout regulator of NMOS output power tube |
| CN111650987A (en) * | 2020-06-23 | 2020-09-11 | 上海安路信息科技有限公司 | Low dropout regulator of PMOS output power tube |
| CN111665893A (en) * | 2020-06-23 | 2020-09-15 | 上海安路信息科技有限公司 | Low dropout regulator of NMOS output power tube |
| CN114675697A (en) * | 2020-12-25 | 2022-06-28 | 圣邦微电子（北京）股份有限公司 | Internal power supply management circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106249795A (en) * | 2016-08-31 | 2016-12-21 | 电子科技大学 | A kind of LDO circuit of output of floating |
| CN106300965A (en) * | 2016-11-16 | 2017-01-04 | 电子科技大学 | A kind of booster power LDO electric power system based on load supplying |
| CN107102680A (en) * | 2017-07-04 | 2017-08-29 | 何金昌 | A kind of low noise low pressure difference linear voltage regulator |
| CN109270978A (en) * | 2017-07-18 | 2019-01-25 | 中航（重庆）微电子有限公司 | Low-dropout linear voltage-regulating circuit, voltage regulation factor compensating unit and method |
| CN107368139A (en) * | 2017-07-29 | 2017-11-21 | 何金昌 | Low-noise LDO (low dropout regulator) of integrated chip circuit |
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| CN107621847A (en) * | 2017-09-19 | 2018-01-23 | 中颖电子股份有限公司 | One kind pull-up accelerating circuit |
| CN108880194A (en) * | 2018-06-22 | 2018-11-23 | 上海艾为电子技术股份有限公司 | A kind of voltage transmission circuit |
| CN110134026A (en) * | 2019-06-06 | 2019-08-16 | 上海晶丰明源半导体股份有限公司 | A kind of low power consumpting controling circuit for intelligent appliance |
| CN111522385A (en) * | 2020-06-23 | 2020-08-11 | 上海安路信息科技有限公司 | Low dropout regulator of PMOS output power tube |
| CN111638745A (en) * | 2020-06-23 | 2020-09-08 | 上海安路信息科技有限公司 | Low dropout regulator of NMOS output power tube |
| CN111650987A (en) * | 2020-06-23 | 2020-09-11 | 上海安路信息科技有限公司 | Low dropout regulator of PMOS output power tube |
| CN111665893A (en) * | 2020-06-23 | 2020-09-15 | 上海安路信息科技有限公司 | Low dropout regulator of NMOS output power tube |
| CN111522385B (en) * | 2020-06-23 | 2022-02-01 | 上海安路信息科技股份有限公司 | Low dropout regulator of PMOS output power tube |
| CN111665893B (en) * | 2020-06-23 | 2022-02-01 | 上海安路信息科技股份有限公司 | Low dropout regulator of NMOS output power tube |
| CN111638745B (en) * | 2020-06-23 | 2022-02-01 | 上海安路信息科技股份有限公司 | Low dropout regulator of NMOS output power tube |
| CN114675697A (en) * | 2020-12-25 | 2022-06-28 | 圣邦微电子（北京）股份有限公司 | Internal power supply management circuit |
| CN114675697B (en) * | 2020-12-25 | 2024-04-16 | 圣邦微电子（北京）股份有限公司 | Internal power supply management circuit |
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