CN102681577B - Voltage adjusting device with switching and linear voltage adjusting mode - Google Patents
Voltage adjusting device with switching and linear voltage adjusting mode Download PDFInfo
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- CN102681577B CN102681577B CN201110062584.1A CN201110062584A CN102681577B CN 102681577 B CN102681577 B CN 102681577B CN 201110062584 A CN201110062584 A CN 201110062584A CN 102681577 B CN102681577 B CN 102681577B
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Abstract
The invention discloses a voltage adjusting device with a switching and linear voltage adjusting mode. The voltage adjusting device comprises an output stage unit, an error amplifier, a pulse width modulating unit, a selecting unit, a first power transistor and a second power transistor, wherein the output stage unit is used for providing an output voltage to the voltage adjusting device and generating a partial voltage of the output voltage; the error amplifier is coupled with the output stage unit as well as used for comparing the partial voltage and a reference voltage and generating a first voltage; the pulse width modulating unit is coupled with the error amplifier as well as used for comparing the first voltage and a voltage signal and generating a second voltage and a third voltage; the selecting unit is coupled with the error amplifier and the pulse width modulating unit as well as used for outputting a fourth voltage, wherein the fourth voltage is one of the first voltage and the second voltage; the first power transistor is coupled with the selecting unit and used for receiving the fourth voltage and a direct current voltage; and the second power transistor is coupled with the pulse width modulating unit, the first power transistor and a grounding end and used for receiving the third voltage.
Description
Technical field
The present invention relates to a kind of voltage regulating device, refer to especially a kind of voltage regulating device with switch type and linear voltage adjusting pattern.
Background technology
Voltage regulator (Voltage regulator), in order to the stable DC voltage that is specific voltage by unregulated voltage transition, has two class voltage-regulation patterns: linear (Linear) voltage-regulation and switch type (Switching) voltage-regulation conventionally.Linear voltage regulator provides less output current conventionally, is suitable for underload or non-loaded behaviour in service, and efficiency is better in the time of underload; Switching Voltage Regulator provides larger output current conventionally, is applicable to heavy duty demand, and efficiency is better in the time of heavy duty.
Although the application surface of this two classes voltage regulator is not quite similar, but under producing in a large number with the industry trend reducing costs, the producer develops has linearity and the double mode voltage regulator of switch type, can use identical integrated circuit (IC) chip and be applicable to various user.But, considering that under cost, the development of this technical field is towards new circuit design and technology, so that the voltage regulator of two quasi-modes can share more circuit member, can meet the requirement of user to electrical property efficiency and reach to reduce costs.
Summary of the invention
In view of this, in one aspect of the invention, the first embodiment provides a kind of voltage regulating device, and it comprises: an output stage unit, and it provides an output voltage of this voltage regulating device, and produces a dividing potential drop of this output voltage; One error amplifier, couples this output stage unit, relatively this dividing potential drop and a reference voltage, and produce one first voltage; One pwm unit, couples this error amplifier, relatively this first voltage and a voltage signal, and produce a second voltage and a tertiary voltage; One selected cell, couples this error amplifier and this pwm unit, and exports one the 4th voltage for this first voltage and second voltage the two one of them; One first power transistor, couples this selected cell, and receives the 4th voltage and a DC voltage; And one second power transistor, coupling this pwm unit, this first power transistor and an earth terminal, this second power transistor receives this tertiary voltage; Wherein, the tie point of this first power transistor and the second power transistor is connected to again this output stage unit.
In another aspect of this invention, the second embodiment provides a kind of voltage regulating device, and it comprises: an output stage unit, and it provides an output voltage of this voltage regulating device, and produces a dividing potential drop of this output voltage; One first error amplifier, couples this output stage unit, relatively this dividing potential drop and one first reference voltage, and produce one first voltage; One second error amplifier, couples this output stage unit, relatively this dividing potential drop and one second reference voltage, and produce a second voltage; One pwm unit, couples this second error amplifier, relatively this second voltage and a voltage signal, and produce a tertiary voltage and one the 4th voltage; One selected cell, couples this first error amplifier and this pwm unit, and exports one the 5th voltage for this first voltage and tertiary voltage the two one of them; One first power transistor, couples this selected cell, and receives the 5th voltage and a DC voltage; And one second power transistor, coupling this pwm unit, this first power transistor and an earth terminal, this second power transistor receives the 4th voltage; Wherein, the tie point of this first power transistor and the second power transistor is connected to again this output stage unit.
Accompanying drawing explanation
Fig. 1 is according to the circuit diagram of the voltage regulating device of first embodiment of the invention.
Fig. 2 A is the circuit diagram that the voltage regulating device of the first embodiment operates in linear model.
Fig. 2 B is the circuit diagram that the voltage regulating device of the first embodiment operates in switch type pattern.
Fig. 3 is the embodiment of multiple transistor parallel connections, to realize the transistorized circuit diagram of Adjustable Current Circuit.
Fig. 4 is according to the circuit diagram of the voltage regulating device of second embodiment of the invention.
Main element symbol description
100/200 voltage regulating device 110 output stage unit
120 error amplifier 130 pwm unit
132 comparer 134 predrivers
140 selected cells 150 (P type) power transistor
160 (N-type) power transistor, 170 control modules
151～158 transistor S
mswitch
S
1～S
8switch C
s/ C
lfilter capacitor
L inductance
Embodiment
Hereinafter with reference to the graphic detailed description of enclosing and feature of the present invention, object, function are described, and reach used technological means; But cited embodiment is only aid illustration, being beneficial to has further cognitive what understanding to the present invention, does not therefore limit the scope of the invention and technological means.
Please refer to Fig. 1, it is according to the circuit diagram of the voltage regulating device of first embodiment of the invention.The voltage regulating device 100 of the present embodiment comprises an output stage unit 110, an error amplifier 120, a pwm unit 130, a selected cell 140 and multiple power transistor 150/160; This voltage regulating device 100 can provide according to actual demand switch type or linear voltage-regulation pattern, and the output stage that said two devices mode common is identical and power transistor, to be applicable to various user's demand.
This output stage unit 110 is as the output stage of this voltage regulating device 100, in order to stable output voltage V to be provided
out.The output stage unit 110 of the present embodiment is made up of a bleeder circuit and a low-pass filter circuit, and this bleeder circuit is made up of multiple resistance serial connections, and utilizes the mode of electric resistance partial pressure to produce this output voltage V
outdividing potential drop V
d, regulate the error amplifier 120 of pattern as input voltage to offer switch type and linear voltage.This low-pass filter circuit is made up of electric capacity or inductance, if voltage regulating device 100 selects linear voltage to regulate pattern, this low-pass filter circuit is made up of the first electric capacity; If voltage regulating device 100 selects bootstrap voltage to regulate pattern, this low-pass filter circuit is made up of the second electric capacity and inductance.In this embodiment, form electric capacity and/or the inductance of this low-pass filter circuit, be not integrated in the integrated circuit (IC) chip of this voltage regulating device 100 own, but (Discrete) element separating, the electric capacity of this low-pass filter circuit and/or inductance are selected according to design specification and are installed; But be not limited to this, this low-pass filter circuit also can be made up of the first filtering circuit that comprises the first electric capacity and the second filtering circuit that comprises the second electric capacity and inductance, and above-mentioned low-pass filter circuit is integrated in the integrated circuit (IC) chip of this voltage regulating device 100, and be the mode of operation of linearity or switch type according to it, select the first filtering circuit or the second filtering circuit to export suitable voltage.
This error amplifier 120 of the present embodiment is that switch type and linear voltage regulate pattern the two shares, and it couples this output stage unit 110 and receives this dividing potential drop V
d, and this dividing potential drop V relatively
dan and reference voltage V
refto produce error signal and to be amplified, and output the first voltage V
1, operate in linear voltage for the present embodiment and regulate pattern.This pwm unit 130 provides bootstrap voltage to regulate the voltage-regulation of pattern, and it further comprises a comparer 132 and a predriver 134 in the present embodiment.This comparer 132 couples this error amplifier 120 and receives this first voltage V
1, and this first voltage V relatively
1and triangular wave or a sawtooth voltage signal V
tri, and produce a comparison signal V
comp, this comparison signal V
compbe sent to this predriver 134 and carry out drive amplification, and the driving signal of output pulse width modulation: second voltage V
2and tertiary voltage V
3.The being combined through series connection of this error amplifier 120, comparer 132 and predriver 134 is in order to produce pulse width modulated driving signal, operates in bootstrap voltage regulate pattern for the present embodiment.
These selected cell 140 use are so that this voltage regulating device 100 is selected the voltage-regulation pattern of linearity or switch type, it couples this error amplifier 120 and this pwm unit 130, and regulate pattern according to selected linearity or bootstrap voltage, output one the 4th voltage V
4for this first voltage V
1and second voltage V
2the two one of them, certainly still must regulate pattern according to selected linearity or bootstrap voltage, the foregoing electric capacity of this low-pass filter circuit or inductance composition are set.
In addition, the present embodiment can be also the design of intelligent chip, adds a control module 170, and it couples this pwm unit 130, this selected cell 140 and this output stage unit 110.This control module 170 can judge the mode of operation of this voltage regulating device, if this voltage regulating device is linear model, exports control signal and makes that this pwm unit 130 is closed, the 4th voltage V of this selected cell
4be output as this first voltage V
1, and the low-pass filter circuit of this output stage unit 110 select this first electric capacity, think that this voltage regulating device 100 provides suitable output voltage; If this voltage regulating device is switch type pattern, exports control signal and make that this pwm unit 130 is opened, the 4th voltage V of this selected cell
4be output as this second voltage V
2, and the low-pass filter circuit of this output stage unit 110 select this second electric capacity and inductance.
The power transistor of the present embodiment comprises a P type metal-oxide half field effect transistor 150 and a N-type metal-oxide half field effect transistor 160.This P type metal-oxide half field effect transistor 150 itself can with this error amplifier 120 and corresponding output stage unit 110, form the voltage regulator of a linearity.In the case, the grid of this P type metal-oxide half field effect transistor 150 couples this selected cell 140 and receives the 4th voltage V
4, its source class is connected to a DC voltage V
dD, and its drain electrode is connected to this output stage unit 110.On the other hand, the complementary field-effect transistor (CMOS) that this P type and N-type metal-oxide half field effect transistor 150/160 form can with this error amplifier 120, this pwm unit 130 and corresponding output stage unit 110, form the voltage regulator of a switch type.In the case, further connect the drain electrode of this N-type metal-oxide half field effect transistor 160 to the drain electrode of this P type metal-oxide half field effect transistor 150 (certainly also can be connected to this output stage unit 110) simultaneously; And the grid of this N-type metal-oxide half field effect transistor 160 couples this pwm unit 130 to receive this tertiary voltage V
3, its source class is connected to an earth terminal.
In order to make this voltage regulating device 100 can select or switch linear and switch type operator scheme, the present embodiment adds a switch S before the grid of this N-type metal-oxide half field effect transistor 160
m, it is also subject to the control of this selected cell 140: if select linear voltage to regulate pattern, this selected cell 140 is output as the first voltage V
1, and this switch S
mmake the grid of this N-type metal-oxide half field effect transistor 160 be connected to earth terminal, this transistor 160 therefore by by; If select bootstrap voltage to regulate pattern, this selected cell 140 is output as second voltage V
2, and this switch S
mmake the grid of this N-type metal-oxide half field effect transistor 160 be connected to this tertiary voltage V that this pwm unit 130 is exported
3thereby, be subject to tertiary voltage V
3regulation and control operate.Above-mentioned result again shows circuit respectively in Fig. 2 A and Fig. 2 B.As shown in the figure, the present embodiment can provide linearity and bootstrap voltage to regulate pattern really, and shares identical power transistor and output stage bleeder circuit.Wherein, for the linear operation mode of Fig. 2 A, selected filter capacitor C
lconventionally less, select in the present embodiment 1 μ F; And for the switch type operator scheme of Fig. 2 B, selected filter capacitor C
sconventionally larger, select in the present embodiment 22 μ F, and this inductance L is selected 6.8 μ H; But not as limit, the selecting depending on actual user demand of this electric capacity and inductance value.
It should be noted that linear voltage regulator provides less output current conventionally, be suitable for underload or non-loaded behaviour in service, and efficiency is better in the time of underload; Switching Voltage Regulator provides larger output current conventionally, is applicable to heavy duty demand, and efficiency is better in the time of heavy duty.The linearity of the present embodiment and bootstrap voltage regulate this P type metal-oxide half field effect transistor 150 of mode common, but two modes is inconsistent to the operating current demand of this P type metal-oxide half field effect transistor 150; Therefore, in the design of integrated circuit of the present embodiment, this P type metal-oxide half field effect transistor 150 is made up of multiple transistors institute in parallel, that is to say, these transistorized source electrodes are connected to each other, and drain electrode is also connected to each other, grid is according to required output current, select the grid of right quantity to be connected to each other, rely on the structure of transistor parallel connection, the operating current of this P type metal-oxide half field effect transistor 150 can be adjusted because of actual demand.In addition, because this N-type metal-oxide half field effect transistor 160 is connected serially to the P type metal-oxide half field effect transistor 150 of transistor parallel connection, and only operate in the mode of operation of switch type, thereby must select larger operating current specification.
For instance, Fig. 3 is the embodiment of the P type metal-oxide half field effect transistor 150 of above-mentioned multiple transistor 151～158 parallel connections, and the grid of these transistors 151～158 is respectively connected to respectively a switch S
1～S
8, these switch S
1～S
8the other end all couple this selected cell 140 to receive the 4th voltage V
4; And this selected cell 140 also comprises multiple switch controlling signals, couples respectively these switch S
1～S
8with the conducting (On) of gauge tap or close (Off), can select thus the grid of right quantity to be connected to each other, to provide these voltage regulating device 100 output stages suitable operating current.For example, if this voltage regulating device 100 is linear voltage-regulation pattern, the required operating current of this P type metal-oxide half field effect transistor 150 is less, can make switch S
1～S
2conducting and switch S
3～S
8close; On the other hand, if the voltage-regulation pattern that this voltage regulating device 100 is switch type, the required operating current of this P type metal-oxide half field effect transistor 150 is larger, can make switch S
1～S
8all conductings.So can realize and there is linearity and the double mode shared power transistor of voltage regulating device of switch type, can solve again two modes to the inconsistent problem of operating current demand; But not as limit, this P type metal-oxide half field effect transistor 150 can also be selected the transistor of other Adjustable Current Circuits.
In the first above-mentioned embodiment, this voltage regulating device 100 is that switch type and linear voltage regulate pattern, and the two shares this error amplifier 120; But not as limit, this two modes error amplifier separately also can be set, as the explanation of following examples.Please refer to Fig. 4, it is according to the circuit diagram of the voltage regulating device 200 of second embodiment of the invention.The present embodiment comprises an output stage unit 110, two error amplifiers 120/122, a pwm unit 130, a selected cell 140 and multiple power transistors 150/160.As shown in Figure 4, this error amplifier 120 provides linear voltage to regulate the use of pattern, and it couples this output stage unit 110 and receives this dividing potential drop V
d, and this dividing potential drop V relatively
dan and reference voltage V
ref1to produce error signal and to be amplified, and output the first voltage V
1, operate in linear voltage for the present embodiment and regulate pattern; And another error amplifier 122 provides bootstrap voltage to regulate the use of pattern, it couples this output stage unit 110 and receives this dividing potential drop V
d, and this dividing potential drop V relatively
dand another reference voltage V
ref2to produce error signal and to be amplified, and output the 5th voltage V
5, operate in bootstrap voltage for the present embodiment and regulate pattern.The circuit of other parts of this voltage regulating device 200 and member all, with identical described in the first embodiment, please refer to above-mentioned explanation, do not repeat them here.
As described above comprises feature, structure and other similar effects, and they are only preferred embodiment of the present invention, but can not limit the scope of the invention with this.In addition, feature, structure and other similar effects that the various embodiments described above are shown, also can be the affiliated skill personage in this field is carrying out equalization variation and is modifying according to the present patent application the scope of the claims, will not lose main idea of the present invention place, also do not depart from the spirit and scope of the present invention, former capital should be considered as further status of implementation of the present invention.
In addition, above-mentioned described each embodiment can only implement example at last, can not therefore limit the scope of the invention.For example, the element that each embodiment uses or unit, can be the affiliated skill personage in this field and modify and realize, and will not lose main idea of the present invention.
Claims (16)
1. a voltage regulating device, comprising:
One output stage unit, it provides an output voltage of described voltage regulating device, and produces a dividing potential drop of described output voltage;
One error amplifier, couples described output stage unit, more described dividing potential drop and a reference voltage, and produce one first voltage;
One pwm unit, couples described error amplifier, more described the first voltage and a voltage signal, and produce a second voltage and a tertiary voltage;
One selected cell, couples described error amplifier and described pwm unit, and exports one the 4th voltage, and described the 4th voltage is described the first voltage and second voltage the two one of them;
One first power transistor, couples described selected cell, and receives described the 4th voltage and a DC voltage; And
One second power transistor, couples described pwm unit, described the first power transistor and an earth terminal, and described the second power transistor receives described tertiary voltage; Wherein, the tie point of described the first power transistor and described the second power transistor is connected to described output stage unit.
2. voltage regulating device according to claim 1, it can operate in the mode of operation of linearity and switch type, and comprises a control module, couples described pwm unit, described selected cell and described output stage unit; Described control module judges the mode of operation of described voltage regulating device, and described the 4th Voltage-output of exporting the unlatching of pwm unit described in control signal control or closing, control described selected cell is for described the first voltage or described second voltage and control described output stage unit and provide described voltage regulating device suitable output voltage.
3. voltage regulating device according to claim 1, wherein, the transistor that described the first power transistor is Adjustable Current Circuit.
4. voltage regulating device according to claim 1, wherein, described the first power transistor is P-type mos field effect transistor, and its grid is connected to described the 4th voltage, its source electrode is connected to described DC voltage, and its drain electrode is connected to described the second power transistor.
5. voltage regulating device according to claim 4, wherein, described the first power transistor further comprises the P-type mos field effect transistor of multiple parallel connections.
6. voltage regulating device according to claim 1, wherein, described the second power transistor is N-type mos field effect transistor, and its grid is connected to described tertiary voltage, its source electrode is connected to described earth terminal, and its drain electrode is connected to described the first power transistor.
7. voltage regulating device according to claim 1, wherein, described output stage unit comprises a bleeder circuit and a low-pass filter circuit.
8. voltage regulating device according to claim 7, wherein, if described selected cell is selected described second voltage, described low-pass filter circuit further comprises an inductance.
9. voltage regulating device according to claim 7, wherein, described low-pass filter circuit also comprises:
One first filtering circuit, comprises one first electric capacity; And
One second filtering circuit, comprises one second electric capacity and an inductance.
10. a voltage regulating device, comprising:
One output stage unit, it provides an output voltage of described voltage regulating device, and produces a dividing potential drop of described output voltage;
One first error amplifier, couples described output stage unit, more described dividing potential drop and one first reference voltage, and produce one first voltage;
One second error amplifier, couples described output stage unit, more described dividing potential drop and one second reference voltage, and produce a second voltage;
One pwm unit, couples described the second error amplifier, more described second voltage and a voltage signal, and produce a tertiary voltage and one the 4th voltage;
One selected cell, couples described the first error amplifier and described pwm unit, and to export one the 5th voltage be described the first voltage and tertiary voltage the two one of them;
One first power transistor, couples described selected cell, and receives described the 5th voltage and a DC voltage; And
One second power transistor, couples described pwm unit, described the first power transistor and an earth terminal, and described the second power transistor receives described the 4th voltage; Wherein, the tie point of described the first power transistor and described the second power transistor is connected to again described output stage unit.
11. voltage regulating devices according to claim 10, it can operate in the mode of operation of linearity and switch type, and comprises a control module, couples described pwm unit, described selected cell and described output stage unit; Described control module judges the mode of operation of described voltage regulating device, and described the 5th Voltage-output of exporting the unlatching of pwm unit described in control signal control or closing, control described selected cell is for described the first voltage or tertiary voltage and control described output stage unit and provide described voltage regulating device suitable output voltage.
12. voltage regulating devices according to claim 10, wherein, described the first power transistor is P-type mos field effect transistor, and its grid is connected to described the 5th voltage, its source electrode is connected to described DC voltage, and its drain electrode is connected to described the second power transistor.
13. voltage regulating devices according to claim 12, wherein, described the first power transistor further comprises the P-type mos field effect transistor of multiple parallel connections.
14. voltage regulating devices according to claim 10, wherein, described the second power transistor is N-type mos field effect transistor, and its grid is connected to described the 4th voltage, its source electrode is connected to described earth terminal, and its drain electrode is connected to described the first power transistor.
15. voltage regulating devices according to claim 10, wherein, described output stage unit further comprises:
One bleeder circuit and a low-pass filter circuit.
16. voltage regulating devices according to claim 15, wherein, described low-pass filter circuit also comprises:
One first filtering circuit, comprises one first electric capacity; And
One second filtering circuit, comprises one second electric capacity and an inductance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110062584.1A CN102681577B (en) | 2011-03-15 | 2011-03-15 | Voltage adjusting device with switching and linear voltage adjusting mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110062584.1A CN102681577B (en) | 2011-03-15 | 2011-03-15 | Voltage adjusting device with switching and linear voltage adjusting mode |
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| CN102681577A CN102681577A (en) | 2012-09-19 |
| CN102681577B true CN102681577B (en) | 2014-06-11 |
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| TWI470917B (en) * | 2012-12-12 | 2015-01-21 | Upi Semiconductor Corp | Voltage regulation integrated circuit, voltage regulator circuit and method thereof |
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| CN101872207A (en) * | 2009-04-21 | 2010-10-27 | 瑞萨电子株式会社 | Voltage modulator circuit |
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| DE10254821A1 (en) * | 2002-11-25 | 2004-06-03 | Robert Bosch Gmbh | Voltage regulator circuit |
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| JP2000010644A (en) * | 1998-06-25 | 2000-01-14 | Canon Inc | Voltage adjuster |
| CN2904068Y (en) * | 2005-03-07 | 2007-05-23 | 圆创科技股份有限公司 | Linear voltage regulator |
| CN101258457A (en) * | 2005-09-07 | 2008-09-03 | 霍尼韦尔国际公司 | Low drop out voltage regurator |
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