CN206863618U - Voltage regulator circuit - Google Patents
Voltage regulator circuit Download PDFInfo
- Publication number
- CN206863618U CN206863618U CN201720371748.1U CN201720371748U CN206863618U CN 206863618 U CN206863618 U CN 206863618U CN 201720371748 U CN201720371748 U CN 201720371748U CN 206863618 U CN206863618 U CN 206863618U
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- China
- Prior art keywords
- voltage
- switch pipe
- electric current
- control circuit
- voltage regulator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is DC
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The utility model discloses a kind of voltage regulator circuit, including first switch pipe and control circuit, the drive end of described control circuit is connected with the control terminal of the first switch pipe；First feeder ear of control circuit is connected through wherein one end of first resistor and input voltage, and the second feeder ear of control circuit is connected with the other end of the input voltage, and the common port of the two is as first node；The first end of the first switch pipe is connected with the first node, second end of the first switch pipe is connected through second resistance with the control terminal of first switch pipe, the first end of output voltage of second end of the first switch pipe as the voltage regulator circuit, the second end of that one end of the input voltage being connected with the first resistor as the output voltage.The circuit realiration that the utility model passes through low pressure process and can keep substantially invariable output voltage in the application of high input voltage occasion under different input voltages.
Description
Technical field
Electric and electronic technical field is the utility model is related to, more specifically to a kind of voltage regulator circuit.
Background technology
Voltage regulator circuit receives supply voltage, and according to the demand of load or use occasion, exports expected output electricity
Pressure, also output voltage can control to be in pressure constant state.Linear voltage adjusts circuit as conventional voltage regulator circuit, but existing skill
The linear voltage regulation circuit of art is generally used for low voltage difference occasion, and input voltage and output voltage are relatively low.For example, low voltage difference
Linear voltage regulator (low dropout regulator, abbreviation LDO).
Fig. 1 show the linear voltage dropping circuit schematic diagram of prior art.By adjusting transistor M01, input voltage is dropped
Pressure obtains output voltage Vout.The output voltage Vout passes through the branch pressure voltage being made up of resistance R01 and R02, is exported
Voltage sampling signal FB, amplifier U01 pass through controlling transistor M01 so that output voltage sampled signal FB levels off to internal reference
Voltage VREF, so that output voltage is constant.Just as described above, the prior art scheme is applied to low input and output electricity
Pressure, and common scheme when input and output voltage pressure difference is smaller.
However, when input and output voltage is high pressure, as above hectovolt, a few hectovolts, then the grid of linear transistor is to system
Ground is upper hectovolt, the high pressure of a few hectovolts, therefore the drive circuit of transistor needs to bear corresponding high pressure, the voltage of prior art
Regulation circuit can not solve above-mentioned technical problem, have impact on application of the voltage regulator circuit in high pressure field.
Utility model content
In view of this, the utility model proposes a kind of voltage regulator circuit, for solving the voltage-regulation of prior art
Circuit is dfficult to apply to the technical problem of high pressure occasion, and constant output voltage is kept under different input voltages.
According to a kind of voltage regulator circuit of the present utility model, including first switch pipe and control circuit, described control
The drive end of circuit is connected with the control terminal of the first switch pipe；First feeder ear of control circuit is through first resistor and input
Wherein one end connection of voltage, the second feeder ear of control circuit is connected with the other end of the input voltage, the two public
End is used as first node；The first end of the first switch pipe is connected with the first node, and the second of the first switch pipe
End is connected through second resistance with the control terminal of first switch pipe, and the second end of the first switch pipe is as voltage-regulation electricity
The first end of the output voltage on road, that one end that the input voltage is connected with the first resistor is as the voltage-regulation
Second end of the output voltage of circuit.
Alternatively, it is provided with reference current in described control circuit, the first described feeder ear receives sign and flows through the
First electric current of the electric current of one resistance, the drive end of the control circuit receive the second electricity for characterizing the electric current for flowing through second resistance
Stream；The second described electric current is equal to the difference of the first electric current and reference current.
Alternatively, when the first described electric current is less than or equal to reference current, the controlled system of control terminal voltage of first switch pipe
Circuit pulls up, and the first switch pipe is fully on so that output voltage follows the input voltage to change.
Alternatively, when the first described electric current is more than reference current, according to first switch described in second current regulation
The control terminal voltage of pipe, by output voltage clamper, to cause output voltage substantially constant.
Alternatively, according to the reference current, first resistor or/and second resistance, the constant pressure of the output voltage is adjusted
Value.
Alternatively, when the resistance of the first resistor is equal to the resistance of second resistance, by changing the big of reference current
Small or change first resistor, the resistance of second resistance, to adjust the constant pressure value of the output voltage.
Alternatively, described voltage regulator circuit also includes the first electric capacity, one end of first electric capacity and described first
Resistance is connected with the common port of control circuit, and the other end of first electric capacity is connected with the first node.
Alternatively, described control circuit is is integrated in piece, the drive end of the control circuit, the first feeder ear and the
Two feeder ears are drawn by pin respectively.
In summary, compared with prior art, according to voltage regulator circuit of the present utility model, after circuit start, divide
For two stages, when first electric current is less than or equal to reference current, then output voltage follows input voltage to rise, Zhi Daosuo
State the first electric current and be more than the reference current, then by the output voltage clamper, to cause output voltage substantially constant, and can root
According to the reference current, first resistor or/and second resistance, the constant pressure value of the output voltage is adjusted.The utility model passes through
The circuit realiration of low pressure process and can be kept substantially invariable defeated under different input voltages in the application of high input voltage occasion
Go out voltage.
Brief description of the drawings
Fig. 1 show the structural representation of prior art voltage regulator circuit；
Fig. 2 show the structural representation of the utility model voltage regulator circuit embodiment one；
Fig. 3 show the part-structure schematic diagram of control circuit in embodiment one；
Fig. 4 show the structural representation of the utility model voltage regulator circuit embodiment two；
Fig. 5 show the working waveform figure of the utility model voltage regulator circuit.
Embodiment
Preferred embodiment of the present utility model is described in detail below in conjunction with accompanying drawing, but the utility model is not merely
It is limited to these embodiments.The utility model covers any replacement made in spirit and scope of the present utility model, modification, equivalent
Method and scheme.
Thoroughly understand in order that the public has to the utility model, in following the utility model preferred embodiment specifically
Understand concrete details, and description without these details can also understand that this practicality is new completely for a person skilled in the art
Type.
With reference to shown in 2, the circuit structure that the utility model voltage regulator circuit implements one is illustrated.Described voltage-regulation
Circuit includes first switch pipe M1 and control circuit, the drive end G of described control circuit and first switch pipe M1 control
End connection processed；First feeder ear VCC of control circuit connects through wherein one end of first resistor R1 and input voltage vin, control
Second feeder ear of circuit is connected with the other end of the input voltage vin, and the common port of the two is as first node；Described
One switching tube M1 first end is connected with the first node, and the second end of the first switch pipe M1 is through second resistance R2 and
One switching tube M1 control terminal connection, the output voltage of the second end of the first switch pipe M1 as the voltage regulator circuit
Vout first end, the input voltage vin is with that one end that the first resistor R1 is connected as voltage-regulation electricity
The output voltage Vout on road the second end.
Above annexation is two kinds of situations of NMOS and PMOS suitable for first switch pipe.Fig. 2 illustrates described first and opened
The situation that pipe M1 is NMOS is closed, in this case, first switch pipe M1 the second end (drain electrode) D is as the low of output voltage Vout
Potential end, the hot end of the input voltage vin also serve as the hot end of the output voltage Vout simultaneously；The control
First feeder ear VCC of circuit is connected by first resistor with the hot end of the input voltage vin, the control circuit
Second feeder ear is connected with the cold end (i.e. earth terminal) of the input voltage vin.As shown in Figure 2, the first of control circuit
Feeder ear VCC can both detect the electric current (electric current for flowing through first resistor R1) of input control circuit, while realize to control electricity
Road powers, and the first electric current i1 can characterize busbar voltage (hot end of input voltage), and the second electric current i2 can characterize first
Switching tube M1 the second end (drain electrode) D voltage.Then have：
I1=(Vin-VCC)/R1；I2=(VD-VG)/R2；Wherein VD is first switch pipe M1 the second end D voltage,
VG is first switch pipe M1 control terminal voltage.
With reference to shown in figure 3, the part circuit structure of control circuit in the utility model is illustrated.The content of accompanying drawing 3 is based on
Fig. 2 embodiment one, reference current Iref is provided with described control circuit, the first described feeder ear VCC, which is received, to be characterized
The first electric current i1 of first resistor R1 electric current is flowed through, the drive end G of the control circuit receives sign and flows through second resistance R2
Electric current the second electric current i2；When the first described electric current i1 is less than or equal to reference current Iref, then by electric current i3 by drive end G
Voltage pull-up, electric current i3 is the electric current for flowing through resistance R3, can also replace the resistance, general electric current by a current source
Source is fixed current, and the electric current for flowing through resistance can be as the pressure difference at its both ends changes and changes, and the first described electric current i1 is big
When reference current Iref, on stricti jurise, when the first described electric current i1 is more than (Iref+i3), because electric current i3 is smaller,
It can ignore during calculating or in principles illustrated, it is possible to which it is the first electric current i1 and reference current to think the second electric current i2
Iref difference.
It is for principle of the utility model on the first electric current i1 and the second electric current i2：The size of the second electric current i2
Equal to the first electric current i1 and Iref difference, but can not accomplish in physical circuit realization complete equal.In the first electric current i1
During more than reference current Iref, actually can should not pull-up current i3, but in the first electric current i1 be less than reference current
During Iref, it is limited to the limitation of circuit structure in this accompanying drawing 3, the pull-up current of reflection the difference between the two can not be produced, so adding
Sourcing current i3, to be worked when the first electric current i1 is less than reference current Iref.
The first described electric current i1 is less than or equal to reference current Iref (i1>Iref) (as mentioned above, in description principle
When have ignored electric current i3) when, first switch pipe M1 control terminal voltage is equal with its second terminal voltage (VD=VG), passes through
Pull-up current i3 in control circuit, which is pulled up, make it that VG is high level, and the first switch pipe M1 is fully on, and now VD declines
To first switch pipe M1 conduction voltage drop, output voltage Vout hot end and the hot end of input voltage vin are same
End, the cold end of output voltage Vout cold end only than input voltage vin are higher by first switch pipe M1 conduction voltage drop,
So that output voltage Vout follows the input voltage vin to change.
When the first described electric current i1 is more than reference current Iref, the first switch is adjusted according to the second electric current i2
Pipe M1 control terminal voltage VG, by output voltage Vout clampers, to cause output voltage Vout substantially constants.VD is as output electricity
Force down the voltage of potential end, VD=VG+i2 × R2=VG+ (i1-Iref) × R2, so as to draw on output voltage Vout with
Draw a conclusion.
Vout=Vin-VD=(VCC+i1 × R1)-[VG+ (i1-Iref) × R2]
=i1 × (R1-R2)+(VCC-VG)+Iref × R2；
Need to declare again, for the ease of signal, the above, which calculates, ignores pull-up current i3.In order to reduce variable, take
R1=R2, now Vout=Iref × R2+ (VCC-VG), because VCC-VG value changes are smaller, it is possible to by changing base
Quasi- electric current Iref and/or second resistance R2 value changes output voltage Vout.In the situation that Iref and second resistance R2 is determined
Under, output voltage Vout keeps substantially constant.
With reference to shown in figure 4, the circuit structure that the utility model voltage regulator circuit implements two is illustrated.Embodiment two is in work
Make similar to embodiment one in principle, the main distinction of the two is, embodiment one is that output voltage Vout is arranged on into input
Voltage Vin hot side, and second embodiment is that output voltage Vout is arranged on to the low potential side of input voltage vin, this
Just determine the difference of the two circuit connecting relation, the first switch pipe M1 in additional embodiment two uses PMOS.In Fig. 4,
First feeder ear VCC of control circuit connects through first resistor R1 and the cold end of input voltage vin, the first electric capacity C1 and R1
Series connection, the C1 other end and the hot end of input voltage connect, the second feeder ear of control circuit and the height of input voltage vin
Potential end connects.It is consistent with embodiment one, in two embodiments, make the source electrode of metal-oxide-semiconductor as first end, drain electrode
For the second end, in embodiment two, first switch pipe M1 first end (source electrode) S and the hot end of input voltage vin connect,
First switch pipe M1 the second end (source electrode) D and the cold end of input voltage vin connect, first switch pipe M1 the second end with
Second resistance R2 is connected between control terminal, first switch pipe M1 control terminal and the drive end of control circuit connect.First opens
Hot end of pipe M1 the second end as output voltage Vout is closed, the cold end of input voltage vin is as output voltage
Vout cold end.Current relationship and operation principle description for embodiment two, refer to the theory of correlation in embodiment one
State.
With reference to shown in figure 5, the work wave of the utility model voltage regulator circuit is illustrated, mainly illustrates control circuit
Drive end G voltage VG, first switch pipe M1 the second terminal voltage, input voltage vin and output voltage Vout waveform.Fig. 5
In, the waveform of Main Basiss embodiment one, it can be varied from for positive negative direction of embodiment two its waveform etc., because the two is former
Reason is consistent, therefore only by taking Fig. 5 waveform as an example.In 0~t1 moment, voltage regulator circuit start-up course, with input voltage vin
Rising, VG and VD magnitudes of voltage also gradually rise, and at the t1 moment, complete to start, and output voltage Vout starts from scratch risings, and VD is electric
Pressure also drops to its conduction voltage drop because of first switch pipe M1 conducting, between t1~t2, keeps VD and VG to keep above-mentioned shape
State, output voltage Vout follow input voltage vin to rise, and at the t2 moment, the first electric current i1 is more than reference current Iref, then
Start to adjust VG magnitudes of voltage, due to VD=VG+i2 × R2=VG+ (i1-Iref) × R2.The description as described in Fig. 3, it is known that, it is defeated
Go out voltage Vout substantially constants, i.e., continue to raise with input voltage vin, output voltage Vout is held essentially constant.Simultaneously
Output voltage values can be adjusted by adjusting the resistance of reference current and second resistance.
Although embodiment is separately illustrated and illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
Refer to another embodiment on the books.
Above to having carried out detailed description according to preferred embodiment of the present utility model, but the circuit on the patent and have
Beneficial effect should not be considered as being limited only to described above, and disclosed embodiment and accompanying drawing can be better understood from this practicality
New, therefore, embodiment disclosed above and Figure of description content are that this practicality is newly in order to be better understood from the utility model
Type protection is not limited to embodiment scope of disclosure, replacement of the those of ordinary skill in the art to the utility model embodiment, repaiies
Change within the scope of protection of the utility model.
Claims (8)
1. a kind of voltage regulator circuit, including first switch pipe and control circuit, the drive end of described control circuit with it is described
The control terminal connection of first switch pipe；It is characterized in that：
First feeder ear of control circuit connects through wherein one end of first resistor and input voltage, the second power supply of control circuit
End is connected with the other end of the input voltage, and the common port of the two is as first node；The first end of the first switch pipe
It is connected with the first node, the second end of the first switch pipe is connected through second resistance with the control terminal of first switch pipe,
The first end of output voltage of second end of the first switch pipe as the voltage regulator circuit, the input voltage and institute
State the second end of that one end that first resistor is connected as the output voltage of the voltage regulator circuit.
2. voltage regulator circuit according to claim 1, it is characterised in that benchmark electricity is provided with described control circuit
Stream, the first described feeder ear receive the first electric current for characterizing the electric current for flowing through first resistor, the drive end of the control circuit
Receive the second electric current for characterizing the electric current for flowing through second resistance；The second described electric current be equal to the first electric current and reference current it
Difference.
3. voltage regulator circuit according to claim 2, it is characterised in that the first described electric current is less than or equal to benchmark electricity
During stream, the controlled circuit processed of control terminal voltage of first switch pipe pulls up, and the first switch pipe is fully on so that output voltage
The input voltage is followed to change.
4. according to the voltage regulator circuit described in claim 1 or 2 or 3, it is characterised in that the first described electric current is more than benchmark
It is defeated to cause by output voltage clamper according to the control terminal voltage of first switch pipe described in second current regulation during electric current
Go out voltage substantially constant.
5. the voltage regulator circuit according to Claims 2 or 3, it is characterised in that according to the reference current, first resistor
Or/and second resistance, adjust the constant pressure value of the output voltage.
6. voltage regulator circuit according to claim 4, it is characterised in that be equal to second in the resistance of the first resistor
It is described defeated to adjust by changing the size of reference current or changing first resistor, the resistance of second resistance during the resistance of resistance
Go out the constant pressure value of voltage.
7. according to the voltage regulator circuit described in claim 1 or 2 or 3, it is characterised in that described voltage regulator circuit also wraps
The first electric capacity is included, one end of first electric capacity is connected with the common port of the first resistor and control circuit, first electricity
The other end of appearance is connected with the first node.
8. according to the voltage regulator circuit described in claim 1 or 2 or 3, it is characterised in that described control circuit is to be integrated in
In piece, the drive end of the control circuit, the first feeder ear and the second feeder ear are drawn by pin respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016103795230 | 2016-05-31 | ||
| CN201610379523 | 2016-05-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206863618U true CN206863618U (en) | 2018-01-09 |
Family
ID=60423393
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710231570.5A Active CN107422771B (en) | 2016-05-31 | 2017-04-11 | Voltage regulator circuit and its control method |
| CN201720371748.1U Withdrawn - After Issue CN206863618U (en) | 2016-05-31 | 2017-04-11 | Voltage regulator circuit |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710231570.5A Active CN107422771B (en) | 2016-05-31 | 2017-04-11 | Voltage regulator circuit and its control method |
Country Status (1)
| Country | Link |
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| CN (2) | CN107422771B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422771A (en) * | 2016-05-31 | 2017-12-01 | 杰华特微电子（杭州）有限公司 | Voltage regulator circuit and its control method |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110764563B (en) * | 2019-10-29 | 2024-04-19 | 杰华特微电子股份有限公司 | Voltage regulating circuit and method |
| CN112542954B (en) * | 2020-12-16 | 2022-06-24 | 南京微盟电子有限公司 | Adaptive soft drive control circuit suitable for DCM |
| CN112564511B (en) * | 2020-12-16 | 2022-06-24 | 南京微盟电子有限公司 | Self-adaptive soft drive control circuit suitable for CCM |
| CN112737339B (en) * | 2020-12-16 | 2022-06-24 | 南京微盟电子有限公司 | Self-adaptive soft drive control circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101776930A (en) * | 2009-01-14 | 2010-07-14 | 易亨电子股份有限公司 | Low-voltage start-up circuit that can withstand high voltage and has reverse phase protection |
| CN101866193B (en) * | 2009-04-14 | 2012-05-09 | 上海立隆微电子有限公司 | Linear voltage-stabilizing circuit and control chip thereof |
| JP5849488B2 (en) * | 2011-07-20 | 2016-01-27 | サンケン電気株式会社 | Switching power supply |
| CN107422771B (en) * | 2016-05-31 | 2018-10-30 | 杰华特微电子（杭州）有限公司 | Voltage regulator circuit and its control method |
-
2017
- 2017-04-11 CN CN201710231570.5A patent/CN107422771B/en active Active
- 2017-04-11 CN CN201720371748.1U patent/CN206863618U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422771A (en) * | 2016-05-31 | 2017-12-01 | 杰华特微电子（杭州）有限公司 | Voltage regulator circuit and its control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107422771B (en) | 2018-10-30 |
| CN107422771A (en) | 2017-12-01 |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180109 Effective date of abandoning: 20181030 |