CN105138062B - Improve the system of low pressure difference linear voltage regulator load regulation - Google Patents
Improve the system of low pressure difference linear voltage regulator load regulation Download PDFInfo
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- CN105138062B CN105138062B CN201410234252.0A CN201410234252A CN105138062B CN 105138062 B CN105138062 B CN 105138062B CN 201410234252 A CN201410234252 A CN 201410234252A CN 105138062 B CN105138062 B CN 105138062B
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Abstract
Improve the system of low pressure difference linear voltage regulator load regulation, and in particular to a kind of circuit system.Including a linear voltage-stabilizing circuit, linear voltage-stabilizing circuit produces output voltage to controlled load；Also include a control circuit, it is controllable to export the first control signal to linear voltage-stabilizing circuit；And the controllable scheduled time after the generation of corresponding first control signal exports the second control signal to controlled load；Controlled load is in the lower change operating current of the second control signal control；Linear voltage-stabilizing circuit includes a reference voltage generating circuit, for producing at least two-way reference voltage with different magnitudes of voltage；One adjustment unit, in the first control signal effect under selectively with being connected all the way at least two-way reference voltage, and in the presence of reference voltage adjust output voltage size of current, with regulated output voltage.The present invention controls linear stabilized circuit outputting voltage to change, can improve load regulation before controlled load is changed, it is ensured that system is stable.
Description
Technical field
The present invention relates to electronic technology field, and in particular to a kind of circuit system.
Background technology
It is many in electronic equipment particularly portable electric appts in order to adapt to the high speed development of electronics and the communication technology
Individual functional unit such as audio, illumination, communication, equipment control etc. usually need stable supply voltage, low pressure difference linear voltage regulator
(LDO, Low Dropout regulator) compared to traditional three ends fixed voltage voltage-stablizer, so that smaller input/defeated can be realized
Go out that voltage difference, circuit structure are simple, it is small to take printed circuit plate suqare, without switching noise the advantages of and be used widely.Reason
The power-supply system thought should have the good stability of a system and load transient performance, and output voltage is to circuit and load change
Speech is stable, using the teaching of the invention it is possible to provide fixed output voltage, will not be changed because of time and temperature, wherein load regulation is
The important parameter of low pressure difference linear voltage regulator mapping is weighed, what it was weighed is the load in the case where input voltage is constant
Size variation is to the influence degree of output voltage, and a kind of common system architecture of prior art is as shown in figure 1, controlled negative including one
Carry, a low pressure difference linear voltage regulator, one control circuit, system in the course of the work, when need increase by one controlled load work when,
Control circuit directly transmits control signal to controlled load, and low pressure difference linear voltage regulator provides output voltage to controlled load, existing
The oscillogram of systematic voltage-vs-time or current-vs-time is as shown in Fig. 2 this control system has the drawback that：It is controlled negative
The unexpected increase carried can cause output voltage fluctuation larger, influence the steady operation of system.
The content of the invention
It is an object of the present invention to provide it is a kind of improve low pressure difference linear voltage regulator load regulation system, solve with
Upper technical problem；
Technical problem solved by the invention can be realized using following technical scheme：
Improve the system of low pressure difference linear voltage regulator load regulation, wherein, including a linear voltage-stabilizing circuit, it is described linear
Mu balanced circuit produces output voltage and exported to controlled load；Also include a control circuit, the control circuit includes：
First control signal output, is connected with the linear voltage-stabilizing circuit, and controllable to linear voltage stabilization electricity
Road exports the first control signal；
Second control signal output, is connected with the controlled load, and controllable in corresponding first control
The scheduled time after signal is produced exports the second control signal to the controlled load；
The controlled load is in the lower change operating current of second control signal control；
The linear voltage-stabilizing circuit includes：
One reference voltage generating circuit, for producing at least two-way reference voltage with different magnitudes of voltage；
One adjustment unit, at least two-way have the reference voltage of different magnitudes of voltage can under first control signal is acted on
Selectively provide all the way that reference voltage is to the adjustment unit, the adjustment unit adjusts institute in the presence of the reference voltage
The size of current of output voltage is stated, to stablize the output voltage.
Preferably, the adjustment unit includes an error amplifier, and the error amplifier is provided with first input end and the
Two inputs, the first input end connects the reference voltage, and second input connects a sampling voltage, the error
Amplifier is compared with a sampling voltage the reference voltage, obtains an error amplification signal.
Preferably, the adjustment unit includes a selecting switch, the input of the selecting switch with described at least two-way
Reference voltage is connected, and the control end of the selecting switch connects first control signal, in the work of first control signal
With lower selection, the reference voltage is exported to the adjustment unit all the way.
Preferably, the linear voltage-stabilizing circuit includes an Input voltage terminal, an output voltage terminal, an earth terminal；One adjustment
Power tube is series between the Input voltage terminal and the output voltage terminal；Between the output voltage terminal and the earth terminal
Connect an output capacitance.
Preferably, the adjustment power tube uses the mos field effect transistor of P-channel, the metal
The grid of oxide semiconductor field effect transistor connects the error amplification signal, the metal oxide semiconductor field-effect
The source electrode of transistor connects the Input voltage terminal, and the drain electrode connection of the mos field effect transistor is described
Output voltage terminal.
Preferably, the sampling voltage is produced by a feedback network, and the feedback network is connected to the output voltage
Between end and the earth terminal, to produce the sampling voltage.
Preferably, the feedback network is mainly formed by a resistor voltage divider circuit, and the resistor voltage divider circuit includes subscribing
Quantity and the divider resistance between the output voltage terminal and the earth terminal is connected in series with each other, between the divider resistance
The point being connected forms divider node；The sampling voltage signal is drawn from predetermined divider node.
Preferably, the output capacitance uses aluminum capacitor or ceramic condenser.
Preferably, the control circuit produces first control signal before the controlled load is increased.
Beneficial effect：Due to using above technical scheme, the present invention is before controlled load is changed, control linear voltage stabilization electricity
Road output voltage changes so that when transition occurs for load current, output voltage can be also maintained in the range of predetermined tolerance, can be with
Improve load regulation, it is ensured that system is stable.
Brief description of the drawings
Fig. 1 is the system architecture schematic diagram of prior art；
The waveform of output voltage transient response and controlled load electric current when Fig. 2 increases suddenly for the controlled load of prior art
Figure；
Fig. 3 is system architecture schematic diagram of the invention；
Fig. 4 is linear voltage-stabilizing circuit schematic diagram of the invention；
Fig. 5 is the oscillogram of the main signal of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as limiting to the invention.
Reference picture 3, Fig. 4, improve the system of low pressure difference linear voltage regulator load regulation, wherein, including a linear voltage stabilization
Circuit 1, linear voltage-stabilizing circuit 1 produces output voltage and exported to controlled load 3；Also include a control circuit 2, control circuit 2
Including：
First control signal output, is connected with linear voltage-stabilizing circuit 1, and controllable is exported to linear voltage-stabilizing circuit 1
First control signal s1；
Second control signal output, is connected with controlled load 3, and controllable in corresponding first control signal s1
The scheduled time after generation exports the second control signal s2 to controlled load 3, and controlled load 3 is controlled in the second control signal s2
Lower change operating current；
Linear voltage-stabilizing circuit 1 includes：
One reference voltage generating circuit, for producing at least two-way reference voltage with different magnitudes of voltage；
One adjustment unit, in the first control signal s1 effect under selectively with the roadbed at least two-way reference voltage
Quasi- voltage Vref connections, and in the presence of reference voltage V ref adjust output voltage size of current, with regulated output voltage.
The present invention before system needs to increased or decrease controlled load 3, can control the benchmark electricity of linear voltage-stabilizing circuit 1
Pressure changes so that when transition occurs for load current, output voltage Vout can be also maintained in the range of predetermined tolerance, can be improved
Load regulation, it is ensured that system is stable.
As a kind of preferred embodiment of the present invention, adjustment unit includes an error amplifier 12, error amplifier 12
Provided with first input end and the second input, first input end connection reference voltage Vref, the sampling electricity of the second input connection one
Vfb is pressed, error amplifier 12 is compared with a sampling voltage Vfb reference voltage V ref, obtains an error amplification signal.One kind tool
First input end is inverting input (-) in body embodiment, and the second input is in-phase input end (+).
As a kind of preferred embodiment of the present invention, adjustment unit can include a selecting switch 11, selecting switch 11
Input be connected with least two-way reference voltage, the control end of selecting switch 11 connects the first control signal s1, in the first control
Reference voltage output all the way is selected in the presence of signal s1 processed.Selecting switch 11 can have multiple signal input parts and a letter
Number output end, a signal input part connection reference voltage, signal output part connection error amplifier 12, to provide benchmark all the way
Voltage Vref is to error amplifier 12.
As a kind of preferred embodiment of the present invention, linear voltage-stabilizing circuit 1 includes an Input voltage terminal VDD, an output
Voltage end Vout, an earth terminal GND；One adjustment power tube 14 is series between Input voltage terminal VDD and output voltage terminal Vout；
Connect an output capacitance C1 between output voltage terminal Vout and earth terminal GND, it is preferable that output capacitance C1 can use aluminum capacitor
Or ceramic condenser.
As a kind of preferred embodiment of the present invention, adjustment power tube 14 can use the metal oxide half of P-channel
Conductor field-effect transistor, the grid connection error amplification signal of mos field effect transistor, metal oxidation
The source electrode connection Input voltage terminal VDD of thing semiconductor field effect transistor, the leakage of mos field effect transistor
Pole connection output voltage terminal Vout.It can also be replaced using the mos field effect transistor of N-channel.
As a kind of preferred embodiment of the present invention, sampling voltage Vfb can be produced by a feedback network, feedback net
Network is connected between output voltage terminal Vout and earth terminal GND, to produce sampling voltage Vfb.
As a kind of preferred embodiment of the present invention, feedback network is mainly formed by a resistor voltage divider circuit, resistance point
Volt circuit includes predetermined number and is connected in series with each other the divider resistance between output voltage terminal and earth terminal, divider resistance
Between the point that is connected form divider node；Sampling voltage Vfb signals are drawn from predetermined divider node.One kind specific implementation
Example, feedback network 13 is connected including first resistor R1 and second resistance R2, first resistor R1 and second resistance R2, sampling voltage
Vfb is drawn from the first resistor R1 points being connected with second resistance R2.
As a kind of preferred embodiment of the present invention, control circuit 2 produces first and controlled before increase controlled load 3
Signal processed.
A kind of reference picture 4, specific embodiment, the present invention can include two reference voltages, respectively the first reference voltage
Vref1 and the second reference voltage V ref2, the magnitude of voltage of one of reference voltage is more than the magnitude of voltage of another reference voltage, such as
First reference voltage V ref1 is 0.5V, and the second reference voltage V ref2 is 0.56V or 0.6V, and increase is needed in controlled load 3
When, control linear voltage-stabilizing circuit 1 to select the reference voltage more larger than current base voltage by the first control signal s1, error is put
The big benchmark voltage Vref of device 12 and sampling voltage Vfb difference, produces the error voltage for controlling adjustment power tube 14,
The conducting electric current of adjustment power tube 14 is flowed through in adjustment so that output voltage Vout stable.If sampling voltage Vfb is less than benchmark electricity
Press Vref, the grid voltage of adjustment power tube 14 is pulled down, thus allow more electric currents by with improve output voltage, and such as
Fruit sampling voltage Vfb is higher than reference voltage V ref, and the grid of adjustment power tube 14 can be pulled up, so that less electric current passes through
With reduction output voltage.It is an object of the invention to when transition occurs for load current, output voltage Vout can also maintain pre-
In constant volume difference scope, the transient response of circuit is improved.
Oscillogram with reference to shown in Fig. 5 can be seen that when can make it that load increases using the control system of the present invention, line
Property the fluctuation of mu balanced circuit 1 output voltage it is smaller, improve load regulation, be conducive to the steady operation of system.
The reference voltage generating circuit of the present invention can be provided by bandgap voltage reference.Bandgap voltage reference is because of tool
Have the advantages that low temperature coefficient, it is high PSRR, stability good, be widely adopted.Produced by bandgap voltage reference
The reference voltage unrelated with power supply, technique, temperature.
As the present invention a kind of preferred embodiment, the second control signal output export the second control signal s2 to by
Before control load 3, the first control signal s1 output ends export the first control signal s1 to linear voltage-stabilizing circuit 1.I.e. second control
Signal s2 has the delay of a setting time compared to the first control signal s1, with before ensureing the access system of controlled load 3, output electricity
Pressure Vout accordingly changes.
As a kind of preferred embodiment of the present invention, adjustment power tube 14 of the invention uses an enhanced metal oxygen
Compound semiconductor field effect transistor.
Present invention could apply in portable set, portable set usually needs to set multiple low pressure difference linearities steady
Depressor, to provide each functional unit such as audio, illumination, communication, equipment control respectively, with expanding of system function the need for, it is existing
There is the later stage in technology in system development to increase Special low-voltage difference linear constant voltage regulator and powered to various options, such as phase
Machine module, bluetooth, WiFi and other link blocks.The present invention, which can be realized, is not increasing the base of low pressure difference linear voltage regulator quantity
On plinth, the normal table work of system is realized.
Preferred embodiments of the present invention are the foregoing is only, embodiments of the present invention and protection model is not thereby limited
Enclose, to those skilled in the art, should can appreciate that made by all utilization description of the invention and diagramatic content
Scheme obtained by equivalent substitution and obvious change, should be included in protection scope of the present invention.
Claims (8)
1. improve the system of low pressure difference linear voltage regulator load regulation, it is characterised in that described including a linear voltage-stabilizing circuit
Linear voltage-stabilizing circuit produces output voltage and exported to controlled load, and the controlled load includes at least one；Also include a control
Circuit processed, the control circuit includes：
First control signal output, is connected with the linear voltage-stabilizing circuit, and the control circuit increases in the controlled load
Before, it is controllable to export the first control signal to the linear voltage-stabilizing circuit；
Second control signal output, is connected with the controlled load, and controllable in corresponding first control signal
The scheduled time after generation exports the second control signal to the controlled load；
The controlled load is in the lower change operating current of second control signal control；
The linear voltage-stabilizing circuit includes：
One reference voltage generating circuit, for producing at least two-way reference voltage with different magnitudes of voltage；
One adjustment unit, at least two-way have the reference voltage of different magnitudes of voltage lower optional in first control signal effect
Reference voltage is to the adjustment unit all the way for ground offer, and the adjustment unit adjusts described defeated in the presence of the reference voltage
Go out the size of current of voltage, to stablize the output voltage.
2. according to claim 1 improve the system of low pressure difference linear voltage regulator load regulation, it is characterised in that described
Adjustment unit includes an error amplifier, and the error amplifier is provided with first input end and the second input, and described first is defeated
Enter the end connection reference voltage, second input connects a sampling voltage, and the error amplifier is to benchmark electricity
Pressure is compared with a sampling voltage, obtains an error amplification signal.
3. according to claim 1 improve the system of low pressure difference linear voltage regulator load regulation, it is characterised in that described
Adjustment unit includes a selecting switch, and the input of the selecting switch is connected with reference voltage described at least two-way, the choosing
The control end for selecting switch connects first control signal, and the benchmark all the way is selected in the presence of first control signal
Voltage output is to the adjustment unit.
4. according to claim 2 improve the system of low pressure difference linear voltage regulator load regulation, it is characterised in that described
Linear voltage-stabilizing circuit includes an Input voltage terminal, an output voltage terminal, an earth terminal；One adjustment power tube is series at the input
Between voltage end and the output voltage terminal；Connected between the output voltage terminal and the earth terminal output capacitance.
5. according to claim 4 improve the system of low pressure difference linear voltage regulator load regulation, it is characterised in that described
Adjust the mos field effect transistor that power tube uses P-channel, the metal oxide semiconductor field-effect
The grid of transistor connects the error amplification signal, the source electrode connection institute of the mos field effect transistor
Input voltage terminal is stated, the drain electrode of the mos field effect transistor connects the output voltage terminal.
6. according to claim 4 improve the system of low pressure difference linear voltage regulator load regulation, it is characterised in that described
Sampling voltage is produced by a feedback network, and the feedback network is connected between the output voltage terminal and the earth terminal,
To produce the sampling voltage.
7. according to claim 6 improve the system of low pressure difference linear voltage regulator load regulation, it is characterised in that described
Feedback network is mainly formed by a resistor voltage divider circuit, and the resistor voltage divider circuit includes predetermined number and is connected in series with each other
The point being connected between divider resistance between the output voltage terminal and the earth terminal, the divider resistance forms partial pressure section
Point；The sampling voltage signal is drawn from predetermined divider node.
8. according to claim 4 improve the system of low pressure difference linear voltage regulator load regulation, it is characterised in that described
Output capacitance uses aluminum capacitor or ceramic condenser.
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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 |
| CN106300965B (en) * | 2016-11-16 | 2019-04-02 | 电子科技大学 | A kind of booster power LDO power supply 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 |
| CN109270978B (en) * | 2017-07-18 | 2020-12-22 | 华润微电子（重庆）有限公司 | Low dropout linear voltage stabilizing circuit, voltage regulation rate compensation unit and method |
| CN107368139B (en) * | 2017-07-29 | 2018-11-06 | 泉州格罗特机电设备有限公司 | Low-noise L DO 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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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| US7557550B2 (en) * | 2005-06-30 | 2009-07-07 | Silicon Laboratories Inc. | Supply regulator using an output voltage and a stored energy source to generate a reference signal |
| US7466115B2 (en) * | 2005-09-19 | 2008-12-16 | Texas Instruments Incorporated | Soft-start circuit and method for power-up of an amplifier circuit |
| CN101196755B (en) * | 2006-12-06 | 2011-01-12 | 北京中电华大电子设计有限责任公司 | High-precision voltage regulator |
| CN101661301B (en) * | 2008-08-25 | 2011-06-29 | 原相科技股份有限公司 | Low-voltage-drop linear voltage regulator with frequency compensation |
| US8183905B2 (en) * | 2009-07-27 | 2012-05-22 | Broadcom Corporation | Configurable clock signal generator |
| CN101763139A (en) * | 2010-02-05 | 2010-06-30 | 上海宏力半导体制造有限公司 | Band-gap reference voltage-stabilizing circuit |
| CN102830744A (en) * | 2012-09-17 | 2012-12-19 | 江苏国石半导体有限公司 | Linear voltage regulator employing frequency compensation |
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