CN1851602A - Current-limiting circuit for linear voltage stabilizer and low-voltage difference linear voltage stabilizer - Google Patents
Current-limiting circuit for linear voltage stabilizer and low-voltage difference linear voltage stabilizer Download PDFInfo
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- CN1851602A CN1851602A CN 200610026443 CN200610026443A CN1851602A CN 1851602 A CN1851602 A CN 1851602A CN 200610026443 CN200610026443 CN 200610026443 CN 200610026443 A CN200610026443 A CN 200610026443A CN 1851602 A CN1851602 A CN 1851602A
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Abstract
The present invention includes error amplifier, current output sample circuit, current configuring circuit, and current limiting loop amplifier; wherein said current limiting loop amplifier output end connected with passage-way element input end to form current limiting loop, passage-way element locking current on maximum output enable current through loop action.
Description
Technical field
The present invention relates to a kind of current-limiting circuit, especially a kind of current-limiting circuit that is used for linear voltage regulator and low pressure difference linear voltage regulator (LDO).
Background technology
Linear voltage regulator and low pressure drop (LDO) linear voltage regulator circuit is used for producing clean, a stable output voltage from certain higher, noisy voltage source.The advantage of linear voltage regulator is that output voltage is rapid to the reacting condition of input voltage or load, and the ripple and the noise of output voltage are lower, and circuit framework is simple, and volume is less, and is cheap.Low pressure difference linear voltage regulator is because the lifting of transformation efficiency adds its volume in recent years, and low noise characteristic becomes the main flow of miniwatt step-down and voltage stabilizer.On various portable system and the relevant electronic product of communication by battery power supply, such as mobile phone, PDA, camera etc. all by a large amount of uses.Low pressure reduction (LDO) linear voltage regulator has been the indispensable assembly of power-supply management system, in low voltage, the voltage of smaller power transforms occasion, low pressure reduction (LDO) linear voltage regulator is quite economic selection, in the flourish epoch of following portable type electronic product, its demand will be growing on and on.
In the application of linear voltage regulator and low pressure reduction (LDO) linear voltage regulator,, be very easy to cause voltage stabilizer under extreme working environment such as excess temperature or output short-circuit, to damage if voltage stabilizer device self does not have holding circuit.In traditional bipolar linear voltage regulator, the diodes that are connected between power supply and the passage elements base stage that adopt carry out current limliting more, and this method also is not suitable in the low pressure difference linear voltage regulator that adopts CMOS technology.
Summary of the invention
At the problems referred to above, the present invention utilizes the principle of FEEDBACK CONTROL to propose a kind of current-limiting circuit, this circuit is by within the control loop of linear voltage regulator or low pressure difference linear voltage regulator, increased the output current locking that a secondary ring that is used for current limliting will flow through passage elements and has been sitting in the maximum output current value that allows.
In order to realize the foregoing invention purpose, technical scheme provided by the invention is, a kind of current-limiting circuit that is used for linear voltage regulator and low pressure difference linear voltage regulator, and described circuit comprises:
Error amplifier is for the control loop of linear voltage regulator or low pressure difference linear voltage regulator provides high open-loop gain;
Passage elements, its input end connect described error amplifier output terminal;
The output current sample circuit, its input end connects the output terminal of described passage elements, exports sample rate current behind the electric current of the described passage elements that is used for sampling;
Current setting circuit, the maximum that is used for default described passage elements allows output current value;
Current limliting loop amplifier, its input end connect the output terminal of described current setting circuit and the output terminal of described output current sample circuit, are used to amplify described sample rate current and the described maximum difference that allows output current, produce an error signal.
Reasonable is that described circuit further comprises:
The amplifier second level, its input end connect the output terminal of described current limliting loop amplifier, and its output terminal is connected to the input end of described passage elements, are used to adjust described error signal;
Wherein, described current sampling circuit, current limliting loop amplifier, the amplifier second level and described passage elements form the current limliting loop, and described passage elements is locked in maximum the permission on the output current by the effect of described current limliting loop with electric current.
Reasonable is that described circuit further comprises:
Drive buffer stage, its input end is connected to the output terminal of described error amplifier, and its output terminal is connected to the input end of described passage elements, is used to isolate the output impedance of described error amplifier and the grid stray capacitance of described passage elements;
Wherein, the partial output terminal of described amplifier is connected to the input end of described driving buffer stage, described output current sample circuit, current limliting loop amplifier, the amplifier second level, passage elements and described driving impact damper form the current limliting loop, and described passage elements electric current is locked in maximum the permission on the output current.
Reasonable is that described circuit further comprises:
When linear voltage regulator or low pressure difference linear voltage regulator output current were no more than maximum permissible value, described current limliting loop amplifier output was saturated to power supply, and end the described amplifier second level, and the current limliting loop is in off position.
Reasonable is that described circuit further comprises:
Described passage elements is a transistor.
Description of drawings
Below, with reference to accompanying drawing, for those skilled in the art that, from the detailed description to invention, above-mentioned and other purposes of the present invention, feature and advantage will be apparent.
Fig. 1 is a current-limiting circuit theory diagram of the present invention;
Fig. 2 is the circuit diagram of current-limiting circuit one preferred embodiment of the present invention;
Fig. 3 is the circuit diagram of another preferred embodiment of current-limiting circuit of the present invention.
Embodiment
See also shown in the accompanying drawing 1, current-limiting circuit of the present invention comprises error amplifier 310, passage elements 311, output current sample circuit 312, maximum output current initialization circuit 313, current limliting loop amplifier 314 and the amplifier second level 316 of allowing.Wherein, the input end of passage elements 311 links to each other with the output terminal of error amplifier 310, its output terminal is connected to the input end of output current sample circuit 312, the output terminal of the output terminal of sample circuit 312 and current setting circuit 313 is connected to the input end of current limliting loop amplifier 314, the output terminal of current limliting loop amplifier 314 is connected to the input end of the amplifier second level 316, and the output terminal of the amplifier second level 316 feeds back to the input end of passage elements 311.
Figure 2 shows that another block diagram of the present invention.First difference part is, has increased driving impact damper 315 on the basis of Fig. 1, drives impact damper 315 and is arranged between error amplifier 310 and the passage elements 311.Second difference is that the output terminal of the amplifier second level 316 feeds back to the input end that drives impact damper 315.In above-mentioned two block diagrams, output sample circuit 312, current setting circuit 313 and current limliting loop amplifier 314 and the amplifier second level 316 thereof are monitored the size of output current in the passage elements 311 in real time.Current limliting loop amplifier 314, the amplifier second level 316, driving buffer stage 315, passage elements 311, perhaps current limliting loop amplifier 314, the amplifier second level 316, passage elements 311 are formed the current limliting loop together, when the output current that flows through passage elements 311 surpasses default maximum permission output current value, output current is locked in the maximum output current value that allows.
Fig. 3 is a concrete circuit of implementing, and comprises error amplifier 10, driving buffer stage 11, passage elements 14, output current sample circuit 20, maximum output current initialization circuit 21 and the current limliting loop amplifier 12 and the amplifier second level 13 of allowing.The passage elements here is a path transistor 14, and output current sample circuit 20 is made up of sampling transistor 15 and sample circuit 16.
Below, introduce the course of work of the present invention in conjunction with this circuit diagram:
Electric current in the output current sample circuit 20 sampling path transistors 14, current setting circuit 21 is used for the default path transistor 14 maximum output current values that allow, current limliting loop amplifier 12 allows the difference between current of output current to amplify the current sampling signal of current sampling circuit 20 outputs and the maximum of current setting circuit 21 outputs, obtain sending into the current limliting loop amplifier second level behind the error controling signal, it is PMOS transistor 13, this PMOS transistor 13 is by adjusting this error signal, obtain the output terminal node 100 that a control signal outputs to error amplifier 10, when output current surpasses maximum permission output current value, limit the magnitude of voltage of node 100, and then limited the size of output current.
Specifically, when the electric current that flows through in the path transistor 14 allowed output current less than maximum, the voltage of node 160 was greater than the voltage of node 170.Current limliting loop amplifier 12 is operational amplifiers of a very big gain, and when normal phase input end 160 voltages during greater than the voltage of inverting input 170, output node 130 will be saturated to power supply.When node 130 voltages approached supply voltage, ended the amplifier second level 13 that the PMOS transistor constitutes, and the secondary ring that at this moment is used for current limliting is in off position, and the current limliting auxiliary circuit does not influence the operate as normal of linear voltage regulator control loop yet.
Electric current in flowing through path transistor 14 is gradually near maximum when allowing output current, and the voltage of node 160 reduces and gradually near the voltage of node 170.The voltage of the output node 130 of current limliting loop amplifier 12 also reduces gradually, thereby the amplifier second level 13 that the PMOS transistor constitutes enters duty gradually.When the output current of linear voltage regulator reached maximum permission output current, it is very low that the gain of the control loop of linear voltage regulator can become, and loses the control ability to output voltage.At this moment Fu Zhu current limliting loop will start, and replace the control loop of linear voltage regulator, and the current value in the path transistor 14 is flow through in control.When in case the output current in the path transistor 14 meets or exceeds maximum permission output current, the voltage of the output node 130 of current limliting loop amplifier 12 reduces, open the amplifier second level 13 that the PMOS transistor constitutes, current limliting loop amplifier 12 enters duty, loop negative feedback control just can be worked, and then the output current of path transistor 14 is locked in maximum the permission on the output current value.
The current limliting loop obtains an error signal by amplifying the voltage difference of node 160 and node 170.In scheme shown in Figure 3, further amplified by the amplifier second level 13 from the error signal of current limliting loop amplifier 12, produce a control signal at node 100.This control signal is passed to driving buffer stage 11.The gain that drives buffer stage 11 is 1, can the undistorted grid that control signal is passed to path transistor 14.Loop is by regulating this control signal automatically, and the electric current that will flow through in the path transistor 14 is locked in the maximum allowed current value.When the electric current in the path transistor 14 surpassed maximum permission output current, the voltage of node 130 will reduce, and the voltage of node 100 can uprise, and then the grid voltage of path transistor 14 also can uprise.The gate source voltage of path transistor 14 can diminish so, and the electric current that flows through path transistor 14 can diminish, and by the effect of loop, electric current can be locked in maximum the permission on the output current.In the circuit arrangement that Fig. 1 describes, be exaggerated the device second level from the error signal of current limliting loop amplifier and further amplify, directly the grid at path transistor 14 produces a control signal, is used for controlling the electric current that flows through in the path transistor 14.The principle of control is consistent with the circuit arrangement that Fig. 3 describes.
The front provides the description to preferred embodiment, so that any technician in this area can use or utilize the present invention.Various modifications to these embodiment are conspicuous to those skilled in the art, can be applied to other embodiment to total principle described here and not use creativeness.Thereby, the embodiment shown in the present invention will be not limited to here, and the wide region of principle that should disclose and new feature according to meeting here.
Claims (5)
1. current-limiting circuit that is used for linear voltage regulator and low pressure difference linear voltage regulator, described circuit comprises:
Error amplifier is for the control loop of linear voltage regulator or low pressure difference linear voltage regulator provides high open-loop gain;
Passage elements, its input end connect described error amplifier output terminal;
The output current sample circuit, its input end connects the output terminal of described passage elements, exports sample rate current behind the electric current of the described passage elements that is used for sampling;
Current setting circuit, the maximum that is used for default described passage elements allows output current value;
Current limliting loop amplifier, its input end connect the output terminal of described current setting circuit and the output terminal of described output current sample circuit, are used to amplify described sample rate current and the described maximum difference that allows output current, produce an error signal.
2. the current-limiting circuit that is used for linear voltage regulator and low pressure difference linear voltage regulator according to claim 1 is characterized in that, described circuit further comprises:
The amplifier second level, its input end connect the output terminal of described current limliting loop amplifier, and its output terminal is connected to the input end of described passage elements, are used to adjust described error signal;
Wherein, described current sampling circuit, current limliting loop amplifier, the amplifier second level and described passage elements form the current limliting loop, and described passage elements is locked in maximum the permission on the output current by the effect of described current limliting loop with electric current.
3. the current-limiting circuit that is used for linear voltage regulator and low pressure difference linear voltage regulator according to claim 1 and 2 is characterized in that, described circuit further comprises:
Drive buffer stage, its input end is connected to the output terminal of described error amplifier, and its output terminal is connected to the input end of described passage elements, is used to isolate the output impedance of described error amplifier and the grid stray capacitance of described passage elements;
Wherein, the partial output terminal of described amplifier is connected to the input end of described driving buffer stage, described output current sample circuit, current limliting loop amplifier, the amplifier second level, passage elements and described driving impact damper form the current limliting loop, and described passage elements electric current is locked in maximum the permission on the output current.
4. the current-limiting circuit that is used for linear voltage regulator and low pressure difference linear voltage regulator according to claim 3 is characterized in that, described circuit further comprises:
When linear voltage regulator or low pressure difference linear voltage regulator output current were no more than maximum permissible value, described current limliting loop amplifier output was saturated to power supply, and end the described amplifier second level, and the current limliting loop is in off position.
5. the current-limiting circuit that is used for linear voltage regulator and low pressure difference linear voltage regulator according to claim 4 is characterized in that, described circuit further comprises:
Described passage elements is a transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610026443 CN1851602A (en) | 2006-05-11 | 2006-05-11 | Current-limiting circuit for linear voltage stabilizer and low-voltage difference linear voltage stabilizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610026443 CN1851602A (en) | 2006-05-11 | 2006-05-11 | Current-limiting circuit for linear voltage stabilizer and low-voltage difference linear voltage stabilizer |
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| CN1851602A true CN1851602A (en) | 2006-10-25 |
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| CN 200610026443 Pending CN1851602A (en) | 2006-05-11 | 2006-05-11 | Current-limiting circuit for linear voltage stabilizer and low-voltage difference linear voltage stabilizer |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100480944C (en) * | 2007-05-15 | 2009-04-22 | 北京中星微电子有限公司 | Voltage controlled current source and low voltage difference regulated power supply installed with same |
| CN102830741A (en) * | 2012-09-03 | 2012-12-19 | 电子科技大学 | Dual-loop low dropout regulator |
| CN102999074A (en) * | 2011-09-09 | 2013-03-27 | 株式会社理光 | Low dropout regulator |
| CN103368540A (en) * | 2013-07-26 | 2013-10-23 | 苏州智浦芯联电子科技有限公司 | Automatic-recovery-capable short circuit protection circuit for low dropout linear regulator |
| CN106325344A (en) * | 2015-06-29 | 2017-01-11 | 展讯通信（上海）有限公司 | A low voltage difference voltage stabilizer circuit with an auxiliary circuit |
| TWI569123B (en) * | 2015-03-26 | 2017-02-01 | 晨星半導體股份有限公司 | Ldo with high power conversion efficiency |
| CN108508954A (en) * | 2018-06-11 | 2018-09-07 | 贵州道森集成电路科技有限公司 | A kind of super low-power consumption low pressure difference linear voltage regulator |
| CN109032241A (en) * | 2018-08-24 | 2018-12-18 | 电子科技大学 | A kind of low pressure difference linear voltage regulator charging ductility limit function |
| CN110007707A (en) * | 2019-04-30 | 2019-07-12 | 宁波琻捷电子科技有限公司 | Low pressure difference linear voltage regulator and system |
| CN110058631A (en) * | 2018-01-18 | 2019-07-26 | 恩智浦美国有限公司 | Voltage regulator with feed forward circuit |
| CN111414039A (en) * | 2020-04-03 | 2020-07-14 | 北京中电华大电子设计有限责任公司 | Linear voltage regulator circuit adopting on-chip compensation technology |
| CN113691114A (en) * | 2021-08-26 | 2021-11-23 | 上海泰矽微电子有限公司 | Output maximum load current control circuit and method |
| CN115167599A (en) * | 2022-07-29 | 2022-10-11 | 圣邦微电子（北京）股份有限公司 | Low dropout linear regulator |
-
2006
- 2006-05-11 CN CN 200610026443 patent/CN1851602A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100480944C (en) * | 2007-05-15 | 2009-04-22 | 北京中星微电子有限公司 | Voltage controlled current source and low voltage difference regulated power supply installed with same |
| CN102999074A (en) * | 2011-09-09 | 2013-03-27 | 株式会社理光 | Low dropout regulator |
| CN102999074B (en) * | 2011-09-09 | 2014-10-15 | 株式会社理光 | Low dropout regulator |
| CN102830741A (en) * | 2012-09-03 | 2012-12-19 | 电子科技大学 | Dual-loop low dropout regulator |
| CN103368540A (en) * | 2013-07-26 | 2013-10-23 | 苏州智浦芯联电子科技有限公司 | Automatic-recovery-capable short circuit protection circuit for low dropout linear regulator |
| CN103368540B (en) * | 2013-07-26 | 2016-04-13 | 苏州智浦芯联电子科技有限公司 | For the short-circuit protection circuit that can automatically recover of low pressure difference linear voltage regulator |
| TWI569123B (en) * | 2015-03-26 | 2017-02-01 | 晨星半導體股份有限公司 | Ldo with high power conversion efficiency |
| US9785162B2 (en) | 2015-03-26 | 2017-10-10 | Mstar Semiconductor, Inc. | LDO with high power conversion efficiency |
| CN106325344A (en) * | 2015-06-29 | 2017-01-11 | 展讯通信（上海）有限公司 | A low voltage difference voltage stabilizer circuit with an auxiliary circuit |
| CN106325344B (en) * | 2015-06-29 | 2018-01-26 | 展讯通信（上海）有限公司 | Low-dropout regulator circuit with auxiliary circuit |
| CN110058631A (en) * | 2018-01-18 | 2019-07-26 | 恩智浦美国有限公司 | Voltage regulator with feed forward circuit |
| CN110058631B (en) * | 2018-01-18 | 2022-07-29 | 恩智浦美国有限公司 | Voltage regulator with feed forward circuit |
| CN108508954A (en) * | 2018-06-11 | 2018-09-07 | 贵州道森集成电路科技有限公司 | A kind of super low-power consumption low pressure difference linear voltage regulator |
| CN109032241B (en) * | 2018-08-24 | 2020-03-31 | 电子科技大学 | Low-dropout linear voltage regulator with current limiting function |
| CN109032241A (en) * | 2018-08-24 | 2018-12-18 | 电子科技大学 | A kind of low pressure difference linear voltage regulator charging ductility limit function |
| CN110007707A (en) * | 2019-04-30 | 2019-07-12 | 宁波琻捷电子科技有限公司 | Low pressure difference linear voltage regulator and system |
| CN110007707B (en) * | 2019-04-30 | 2020-12-01 | 南京英锐创电子科技有限公司 | Low dropout regulator and system |
| CN111414039A (en) * | 2020-04-03 | 2020-07-14 | 北京中电华大电子设计有限责任公司 | Linear voltage regulator circuit adopting on-chip compensation technology |
| CN111414039B (en) * | 2020-04-03 | 2022-02-11 | 北京中电华大电子设计有限责任公司 | Linear voltage regulator circuit adopting on-chip compensation technology |
| CN113691114A (en) * | 2021-08-26 | 2021-11-23 | 上海泰矽微电子有限公司 | Output maximum load current control circuit and method |
| CN115167599A (en) * | 2022-07-29 | 2022-10-11 | 圣邦微电子（北京）股份有限公司 | Low dropout linear regulator |
| CN115167599B (en) * | 2022-07-29 | 2024-02-23 | 圣邦微电子（北京）股份有限公司 | Low-dropout linear voltage regulator |
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