CN203387479U - Automatic-recovery short circuit protection circuit for low voltage difference linear voltage regulator - Google Patents
Automatic-recovery short circuit protection circuit for low voltage difference linear voltage regulator Download PDFInfo
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- CN203387479U CN203387479U CN201320448854.7U CN201320448854U CN203387479U CN 203387479 U CN203387479 U CN 203387479U CN 201320448854 U CN201320448854 U CN 201320448854U CN 203387479 U CN203387479 U CN 203387479U
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Abstract
The utility model discloses an automatic-recovery short circuit protection circuit for a low voltage difference linear voltage regulator. The automatic-recovery short circuit protection circuit for the low voltage difference linear voltage regulator mainly comprises the second transistor, the third transistor, the fourth transistor, the fifth transistor, the third resistor and the fourth resistor. The automatic-recovery short circuit protection circuit for the low voltage difference linear voltage regulator has properties of simple structure and high reliability and can substantially reduce self static state power consumption, moreover, the automatic-recovery short circuit protection circuit further has a function of automatic recovery, and recovery of output of the low voltage difference linear voltage regulator can be realized instantly once a short circuit state stops.
Description
Technical field
The utility model relates to a kind of short-circuit protection circuit, especially for the short-circuit protection circuit that can automatically recover of low pressure difference linear voltage regulator.
Background technology
The advantages such as that low pressure difference linear voltage regulator (LDO) has is simple in structure, low-power consumption, low noise, encapsulation is little and peripheral components is few, it is widely applied in consumer electronics product, as smart mobile phone, MP3, panel computer, digital camera, bluetooth earphone etc.It can reduce the saturation voltage of output field effect transistor greatly, makes input voltage can approach very much output voltage, and has reduced power consumption, has greatly extended battery life.
But low pressure difference linear voltage regulator, as the power device of system, is but the weak link of system reliability design always, such as, output short-circuit is the more common abnormal work pattern of low pressure difference linear voltage regulator.When low pressure difference linear voltage regulator during in short-circuit condition, if can not be in time, accurately process, not only can cause the damage of low pressure difference linear voltage regulator itself, but also entail dangers to is to prime and the late-class circuit of low pressure difference linear voltage regulator, make whole system be limited to paralysis, when more serious, also can cause fire and electric shock and other safety accidents.Therefore, perfect short-circuit protection design is the basic demand that guarantees the low pressure difference linear voltage regulator reliability.
At present, the structure of topmost low pressure difference linear voltage regulator and short-circuit protection circuit as shown in Figure 1, power output pipe M1 in Fig. 1, error amplifier 101, the first resistance R 1 and the second resistance R 2 have formed low pressure difference linear voltage regulator, and described power output pipe M1 comprises power supply 102 and Voltage-output 106 ends; The 3rd resistance R 3 in Fig. 1, transistor seconds M2, the 4th transistor M4 and comparator 105 in groups the short-circuit protection circuit of described low pressure difference linear voltage regulator.The sample rate current of power output pipe M1 in Fig. 1 is flowed through after short-circuit protection circuit and is formed sampled voltage; when the output circuit short circuit of described low pressure difference linear voltage regulator; flow through unexpected huge the increasing of electric current of described power output pipe M1; now described sample rate current and sampled voltage also can increase; when described sampled voltage, greatly when surpassing reference voltage 103, the described comparator 105 in Fig. 1 is understood and by a P type field effect transistor M4, power output pipe M1 closed.But the circuit protection based on above circuit structure has following shortcoming: 1. circuit structure relative complex, need a reference circuit to produce described reference voltage 103, also need a described comparator 105.2. when low pressure difference linear voltage regulator during not in short-circuit condition, this short-circuit protection circuit is also consuming power consumption, can not meet like this low pressure difference linear voltage regulator underloading or when unloaded to the requirement of low-power consumption.3. if not being with, the described comparator 105 in circuit do not latch function; when short circuit; described power output pipe M1 can be on off state repeatedly; if described comparator 105 bands latch function, once short circuit, described power output pipe M1 can shut; if but output has broken away from short-circuit condition; only re-power, low pressure difference linear voltage regulator just can restart, and causes this short-circuit protection not possess auto restore facility.
In sum, problem demanding prompt solution is to be improved to overcome above-mentioned defect to the existing short-circuit protection circuit that can automatically recover for low pressure difference linear voltage regulator.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of short-circuit protection circuit that can automatically recover for low pressure difference linear voltage regulator is provided, and this protective circuit is simple in structure, reliability is high and can make quiescent dissipation significantly reduce; Simultaneously, this protective circuit has auto restore facility, once break away from short-circuit condition, the output of low pressure difference linear voltage regulator can immediate recovery.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of short-circuit protection circuit that can automatically recover for low pressure difference linear voltage regulator, this circuit comprises: transistor seconds, the 3rd transistor, the 4th transistor, the 5th transistor, the 3rd resistance and the 4th resistance, wherein, the second port of described transistor seconds is connected with the first port of described the 4th resistance, the second port of described the 4th resistance is connected with the described the 5th transistorized the first port, described the 5th transistorized grounded-grid; The first port of described the 3rd resistance is connected with the first port of described transistor seconds, the second port of described the 3rd resistance is connected with the described the 4th transistorized the first port, described the 4th transistorized grid is connected with the second port of described transistor seconds, and the described the 4th transistorized the second port is connected with the described the 5th transistorized the second port; The described the 3rd transistorized the first port is connected with the first port of described the 3rd resistance, and described the 3rd transistorized grid is connected with described the 3rd resistance the second port, and the described the 3rd transistorized the second port is connected with the grid of described transistor seconds.
Preferably, the described short-circuit protection circuit that can automatically recover for low pressure difference linear voltage regulator also comprises: low pressure difference linear voltage regulator, described low pressure difference linear voltage regulator comprises: the power output pipe, error amplifier, the first resistance, and second resistance, the grid of described power output pipe is connected with the output of described error amplifier and the grid of described transistor seconds respectively, the first port of described power output pipe is connected with the first port of external power source and described transistor seconds respectively, the second port of described power output pipe is connected with the described the 5th transistorized the second port with the first port of described the first resistance respectively, the second port of described the first resistance is connected with the first port of described the second resistance, the second port ground connection of described the second resistance, the negative input end input reference voltage of described error amplifier, positive input terminal is connected with the second port of described the first resistance.
Preferably, the described short-circuit protection circuit that can automatically recover for low pressure difference linear voltage regulator, described power output pipe is P type field effect transistor.
Preferably, the described short-circuit protection circuit that can automatically recover for low pressure difference linear voltage regulator, described transistor seconds is P type field effect transistor, the source electrode of described transistor seconds is connected with external power source together with substrate; Described the 3rd transistor is P type field effect transistor, and described the 3rd transistorized drain electrode is connected with external power source together with substrate; Described the 4th transistor is the N-type field effect transistor, the described the 4th transistorized substrate ground connection; Described the 5th transistor is P type field effect transistor, and described the 5th transistorized source electrode is connected with the second port of described the 4th resistance together with substrate, described the 5th transistorized grounded-grid.
The utility model has the advantages that, the utility model mainly comprises for the short-circuit protection circuit that can automatically recover of low pressure difference linear voltage regulator: transistor seconds, the 3rd transistor, the 4th transistor, the 5th transistor, the 3rd resistance and the 4th resistance.By adopting the foregoing circuit structure to make that the related short-circuit protection circuit for low pressure difference linear voltage regulator of the utility model is simple in structure, reliability is high and can make the quiescent dissipation of circuit own significantly reduce; Simultaneously, this short-circuit protection circuit also has auto restore facility, once break away from short-circuit condition, the output of low pressure difference linear voltage regulator can immediate recovery.
The accompanying drawing explanation
The circuit diagram that Fig. 1 is the existing short-circuit protection circuit that can automatically recover for low pressure difference linear voltage regulator;
Fig. 2 is the circuit diagram of the utility model for the short-circuit protection circuit that can automatically recover of low pressure difference linear voltage regulator.
Embodiment
For further disclosing the technical solution of the utility model, hereby be described with reference to the accompanying drawings execution mode of the present utility model:
Fig. 2 is the circuit diagram of the utility model for the short-circuit protection circuit that can automatically recover of low pressure difference linear voltage regulator, comprised existing low pressure difference linear voltage regulator in Fig. 2, described low pressure difference linear voltage regulator comprises: power output pipe M1, error amplifier 201, the first resistance R 1, and second resistance R 2, described power output pipe M1 comprises grid, the first port and the second port, the second port of described power output pipe M1 is voltage output end 203 simultaneously, described the first resistance R 1, the second resistance R 2 comprises respectively the first port and the second port, the grid of described power output pipe M1 is connected with the output of described error amplifier 201, the first port of described power output pipe M1 is connected with external power source 202, the second port of described power output pipe M1 is connected with the first port of described the first resistance R 1, the second port of described the first resistance R 1 is connected with the first port of described the second resistance R 2, the second port ground connection of described the second resistance R 2, the negative input end input reference voltage 200 of described error amplifier 201, positive input terminal is connected with the second port of described the first resistance R 1.
Also comprised the short-circuit protection circuit that can automatically recover of the utility model for low pressure difference linear voltage regulator in Fig. 2, this short-circuit protection circuit comprises: transistor seconds M2, the 3rd transistor M3, the 4th transistor M4, the 5th transistor M5, the 3rd resistance R 3, and the 4th resistance R 4, the described transistor seconds M2 that states, the 3rd transistor M3, the 4th transistor M4, the 5th transistor M5 comprises respectively grid, the first port and the second port, described the 3rd resistance R 3, and the 4th resistance R 4 comprise respectively the first port and the second port, wherein, the grid of described transistor seconds M2 is connected with the grid of described power output pipe M1, the first port of described power output pipe M1 is connected with the first port of external power source 202 and described transistor seconds M2 respectively, the second port of described transistor seconds M2 is connected with the first port of described the 4th resistance R 4, the second port of described the 4th resistance R 4 is connected with the first port of described the 5th transistor M5, the grounded-grid of described the 5th transistor M5, the first port of described the 3rd resistance R 3 is connected with the first port of described transistor seconds M2, the second port of described the 3rd resistance R 3 is connected with the first port of described the 4th transistor M4, the grid of described the 4th transistor M4 is connected with the second port of described transistor seconds M2, and the second port of described the 4th transistor M4 is connected with the second port of described the 5th transistor M5, the first port of described the 3rd transistor M3 is connected with the first port of described the 3rd resistance R 3, the grid of described the 3rd transistor M3 is connected with described the 3rd resistance R 3 second ports, and the second port of described the 3rd transistor M3 is connected with the grid of described transistor seconds M2.
In addition, in the circuit of Fig. 2, described power output pipe M1 is P type field effect transistor; Described transistor seconds M2 is P type field effect transistor, and the source electrode of described transistor seconds M2 is connected with described external power source together with substrate; Described the 3rd transistor M3 is P type field effect transistor, and the drain electrode of described the 3rd transistor M3 is connected with described external power source 202 together with substrate; Described the 4th transistor M4 is the N-type field effect transistor, the substrate ground connection of described the 4th transistor M4; Described the 5th transistor M5 is P type field effect transistor, and the source electrode of described the 5th transistor M5 is connected with the second port of described the 4th resistance R 4 together with substrate, the grounded-grid of described the 5th transistor M5.
Below in conjunction with the example of putting down in writing in Fig. 2, course of action when the utility model real work is described:
In Fig. 2, described P type field effect transistor M2 be used for the sampling electric current of power output pipe M1 of described low pressure difference linear voltage regulator, described resistance R 3 and R4 are tens kilohms of level resistance, the second port that the drain electrode of described N-type field effect transistor M4 and P type field effect transistor M5 all is connected to described power output pipe M1 i.e. voltage output end 203 in figure, when circuit output voltage decline approaches short-circuit condition, P type field effect transistor M3 and N-type field effect transistor M4 just have enough grid source cut-in voltages, the power output pipe M1 that described P type field effect transistor M3 provides electric current to close described low pressure difference linear voltage regulator while being used for short circuit.
Particularly; when described low pressure difference linear voltage regulator during in normal operating conditions; even output current increases; cause described P type field effect transistor M2 in opening; but because voltage and the pressure reduction between output voltage terminal 203 of external power source 202 are less; described N-type field effect transistor M4 in this short-circuit protection circuit and P type field effect transistor M5 still can't open; this short-circuit protection circuit can not worked; and now; each branch road of this short-circuit protection circuit is in cut-off state, so consume hardly power consumption.When short circuit appears suddenly in described low pressure difference linear voltage regulator load, electric current on its described power output pipe M1 can sharply increase, sample rate current in described P type field effect transistor M2 in this short-circuit protection circuit can equal proportion increase along with the increase of electric current in described power output pipe M1, electric current (meaning with I1) in described P type field effect transistor M2 described the 4th resistance R 4 of flowing through, leakage level connection Voltage-output due to Voltage-output short circuit and described P type field effect transistor M5, cause described P type field effect transistor M5 conducting with regard to enough gate source voltages are arranged, now the gate source voltage of described N-type field effect transistor M4 is that in the V1=I1*R4(formula, V1 means gate source voltage, I1 mean the to flow through electric current of described P type field effect transistor M2, R4 means the resistance value of described the 4th resistance R 4), when the gate source voltage of described N-type field effect transistor M4 rise to certain value the time, described N-type field effect transistor M4 pipe is opened, now, the electric current of described N-type field effect transistor M4 of supposing to flow through is I2, the gate source voltage of described P type field effect transistor M3 is that in the V2=I2*R3(formula, V2 means gate source voltage, I2 mean the to flow through electric current of described N-type field effect transistor M4, R3 means the resistance value of described the 3rd resistance R 3), along with the gate source voltage of described N-type field effect transistor M4 pipe increases gradually, I2 is also increasing, after V2 is greater than the cut-in voltage of described P type field effect transistor M3, described P type field effect transistor M3 opens.Because the leakage level of described P type field effect transistor M3 is connected to the grid of described power output pipe M1, electric current on described P type field effect transistor M3 can cause the gate source voltage of described P type field effect transistor M1 to reduce while increasing gradually, thereby close gradually described P type field effect transistor M1, is power output pipe M1.Finally; when low pressure difference linear voltage regulator during fully in short-circuit condition; this short-circuit protection circuit not there will be closes power output pipe M1 and fully in locking state; the output current that now on described power output pipe M1, still can retain about 10mA left and right; once output breaks away from the short-circuit protection state like this; this short-circuit protection circuit can restPose automatically, no longer affects the normal operation of low pressure difference linear voltage regulator, himself now also consumes hardly power consumption simultaneously.
More than, by description of listed embodiment, basic conception of the present utility model and basic principle have been set forth.But the utility model never is limited to above-mentioned listed execution mode, every equivalent variations of doing based on the technical solution of the utility model, improvement and the deliberately of inferior quality behavior of change, all should belong to protection range of the present utility model.
Claims (4)
1. the short-circuit protection circuit that can automatically recover for low pressure difference linear voltage regulator, it is characterized in that, this circuit comprises: transistor seconds (M2), the 3rd transistor (M3), the 4th transistor (M4), the 5th transistor (M5), the 3rd resistance (R3), and the 4th resistance (R4), wherein, the second port of described transistor seconds (M2) is connected with the first port of described the 4th resistance (R4), the second port of described the 4th resistance (R4) is connected with the first port of described the 5th transistor (M5), the grounded-grid of described the 5th transistor (M5), the first port of described the 3rd resistance (R3) is connected with the first port of described transistor seconds (M2), the second port of described the 3rd resistance (R3) is connected with the first port of described the 4th transistor (M4), the grid of described the 4th transistor (M4) is connected with the second port of described transistor seconds (M2), and the second port of described the 4th transistor (M4) is connected with the second port of described the 5th transistor (M5), the first port of described the 3rd transistor (M3) is connected with the first port of described the 3rd resistance (R3), the grid of described the 3rd transistor (M3) is connected with described the 3rd resistance (R3) the second port, and the second port of described the 3rd transistor (M3) is connected with the grid of described transistor seconds (M2).
2. the short-circuit protection circuit that can automatically recover for low pressure difference linear voltage regulator according to claim 1, it is characterized in that, this circuit also comprises: low pressure difference linear voltage regulator, described low pressure difference linear voltage regulator comprises: power output pipe (M1), error amplifier (201), the first resistance (R1), and second resistance (R2), the grid of described power output pipe (M1) is connected with the grid of described transistor seconds (M2) with the output of described error amplifier (201) respectively, the first port of described power output pipe (M1) is connected with the first port of described transistor seconds (M2) with external power source (202) respectively, the second port of described power output pipe (M1) is connected with the second port of described the 5th transistor (M5) with the first port of described the first resistance (R1) respectively, the second port of described the first resistance (R1) is connected with the first port of described the second resistance (R2), the second port ground connection of described the second resistance (R2), the negative input end input reference voltage (200) of described error amplifier (201), positive input terminal is connected with the second port of described the first resistance (R1).
3. the short-circuit protection circuit that can automatically recover for low pressure difference linear voltage regulator according to claim 2, is characterized in that, described power output pipe (M1) is P type field effect transistor.
4. the short-circuit protection circuit that can automatically recover for low pressure difference linear voltage regulator according to claim 1 and 2, it is characterized in that, described transistor seconds (M2) is P type field effect transistor, and the source electrode of described transistor seconds (M2) is connected with external power source (202) together with substrate; Described the 3rd transistor (M3) is P type field effect transistor, and the drain electrode of described the 3rd transistor (M3) is connected with external power source (202) together with substrate; Described the 4th transistor (M4) is the N-type field effect transistor, the substrate ground connection of described the 4th transistor (M4); Described the 5th transistor (M5) is P type field effect transistor, and the source electrode of described the 5th transistor (M5) is connected with the second port of described the 4th resistance (R4) together with substrate, the grounded-grid of described the 5th transistor (M5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320448854.7U CN203387479U (en) | 2013-07-26 | 2013-07-26 | Automatic-recovery short circuit protection circuit for low voltage difference linear voltage regulator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320448854.7U CN203387479U (en) | 2013-07-26 | 2013-07-26 | Automatic-recovery short circuit protection circuit for low voltage difference linear voltage regulator |
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| CN203387479U true CN203387479U (en) | 2014-01-08 |
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| CN201320448854.7U Withdrawn - After Issue CN203387479U (en) | 2013-07-26 | 2013-07-26 | Automatic-recovery short circuit protection circuit for low voltage difference linear voltage regulator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110069092A (en) * | 2019-04-18 | 2019-07-30 | 上海华力微电子有限公司 | The current foldback circuit of LDO circuit device and LDO circuit |
| CN110456854A (en) * | 2019-08-22 | 2019-11-15 | 上海华力微电子有限公司 | Low pressure difference linear voltage regulator |
-
2013
- 2013-07-26 CN CN201320448854.7U patent/CN203387479U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110069092A (en) * | 2019-04-18 | 2019-07-30 | 上海华力微电子有限公司 | The current foldback circuit of LDO circuit device and LDO circuit |
| US11204613B2 (en) | 2019-04-18 | 2021-12-21 | Shanghai Huali Microelectronics Corporation | LDO circuit device and overcurrent protection circuit thereof |
| CN110456854A (en) * | 2019-08-22 | 2019-11-15 | 上海华力微电子有限公司 | Low pressure difference linear voltage regulator |
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Address after: Suzhou City, Jiangsu province 215000 Industrial Park Suzhou Xinping Street No. 388 Suzhou innovation park off the 23 building 3 layer 09, 10 unit Patentee after: SUZHOU INTELLI-CHIPLINK ELECTRONICS TECHNOLOGY CO., LTD. Address before: Suzhou City, Jiangsu province 215000 Industrial Park Suzhou Xinping Street No. 388 Suzhou innovation park off the 23 building 3 layer 09, 10 unit Patentee before: Suzhou Zhipu Xinlian Electronic Technology Co., Ltd. |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140108 Effective date of abandoning: 20160413 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |