CN113162415B - Input/output management circuit of power supply and electronic equipment - Google Patents
Input/output management circuit of power supply and electronic equipment Download PDFInfo
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- CN113162415B CN113162415B CN202110498672.XA CN202110498672A CN113162415B CN 113162415 B CN113162415 B CN 113162415B CN 202110498672 A CN202110498672 A CN 202110498672A CN 113162415 B CN113162415 B CN 113162415B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
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- Dc-Dc Converters (AREA)
Abstract
The invention provides an input/output management circuit of a power supply and electronic equipment, wherein the input/output management circuit of the power supply comprises a first P-type tube, a second P-type tube, a main N-type tube, an adjusting unit, a negative feedback unit, a resistor and a first unidirectional conduction part capable of forming a first designated voltage drop; the negative feedback unit is used for: and when the input voltage is lower than a first voltage threshold and higher than a second voltage threshold, the main P-type tube is adjusted in a feedback mode according to the voltage of the voltage output end, so that the output voltage of the voltage output end is kept at a specified voltage, and the specified voltage is matched with the second voltage threshold.
Description
Technical Field
The present invention relates to the field of electronic devices, and in particular, to an input/output management circuit for a power supply and an electronic device.
Background
In an electronic device, input/output management circuits each provided with a power supply often have a wide range of input voltages ranging from a lower voltage to a higher voltage, however, in actual use, it is desirable that the output voltage be maintained at the lower voltage so as to support normal operation of the low-voltage circuit therebehind. This requires a transition from a wide input voltage range to a low voltage range.
In order to meet the requirement, a corresponding circuit may be provided between the voltage input terminal and the voltage output terminal, in which a high-voltage P-type tube, a high-voltage N-type tube and a corresponding configuration circuit may be configured, and further, when the input voltage is low, the high-voltage P-type tube is utilized to output the voltage, and when the input voltage is raised to a certain extent, the high-voltage N-type tube may be utilized to output the voltage, but due to the threshold loss of the high-voltage N-type tube, a jump of the output voltage may be brought.
Disclosure of Invention
The invention provides an input/output management circuit of a power supply and electronic equipment, which are used for solving the problem of jump of output voltage.
According to a first aspect of the present invention, there is provided an input/output management circuit for a power supply, including a first P-type pipe, a second P-type pipe, a main N-type pipe, an adjusting unit, a negative feedback unit, a resistor, and a first unidirectional conductive portion capable of forming a first specified voltage drop;
the grid electrode of the first P-type tube is connected with the grid electrode of the second P-type tube, the drain electrode of the first P-type tube is connected with the regulating unit, the drain electrode of the second P-type tube is connected with the grid electrode of the main P-type tube, the first end of the resistor is connected with the voltage input end, the second end of the resistor is connected with the input end of the first unidirectional conduction part, the output end of the first unidirectional conduction part is grounded, the grid electrode of the main P-type tube is connected with the drain electrode of the second P-type tube, the grid electrode of the main P-type tube is also directly or indirectly connected with the negative feedback unit, the source electrode of the main P-type tube is connected with the voltage input end, the drain electrode of the main P-type tube is connected with the voltage output end, the source electrode of the main N-type tube is connected with the voltage input end, the drain electrode of the main N-type tube is connected with the voltage output end, the grid electrode of the main N-type tube is connected with the second resistor, and the negative feedback unit is also connected with the voltage output end;
the adjusting unit is used for:
when the input voltage of the voltage input end is lower than a first voltage threshold value, the current of the first P-type tube and the second P-type tube is regulated to enable the main P-type tube to be conducted so as to utilize the drain electrode output voltage of the main P-type tube;
when the input voltage is higher than the first voltage threshold, the main P-type tube is cut off by adjusting the current of the first P-type tube and the second P-type tube so as to utilize the source electrode output voltage of the main N-type tube;
the negative feedback unit is used for:
and when the input voltage is lower than a first voltage threshold and higher than a second voltage threshold, the main P-type tube is adjusted in a feedback mode according to the voltage of the voltage output end, so that the output voltage of the voltage output end is kept at a specified voltage, and the specified voltage is matched with the second voltage threshold.
Optionally, the adjusting unit includes a current forming part, a first N-type tube, a second N-type tube, a third N-type tube and a first zener diode; the drain electrode of the second P-type tube is grounded with a fourth N-type tube through the negative feedback unit, and the drain electrode of the fourth N-type tube is connected to the drain electrode of the second P-type tube through the negative feedback unit;
the drain electrode of the first N-type tube is connected to the voltage input end through the current forming part, the drain electrode of the second N-type tube is directly or indirectly connected to the positive electrode of the first Zener diode, the negative electrode of the first Zener diode is connected with the drain electrode of the first P-type tube, the drain electrode of the third N-type tube is directly or indirectly connected with the drain electrode of the first P-type tube, the source electrodes of the first N-type tube, the second N-type tube, the third N-type tube and the fourth N-type tube are all grounded, the grid electrodes of the first N-type tube, the second N-type tube, the third N-type tube and the fourth N-type tube are connected together, and the grid electrode of the first N-type tube is connected with the drain electrode;
the current forming part is used for determining the current of the first N-type tube.
Optionally, the adjusting unit further comprises a first high-voltage N-type tube and a second high-voltage N-type tube, and a third high-voltage N-type tube is arranged between the fourth N-type tube and the drain electrode of the second P-type tube;
the drain electrode of the first high-voltage N-type tube is connected with the positive electrode of the first Zener diode, the source electrode of the first high-voltage N-type tube is connected with the drain electrode of the second N-type tube, the drain electrode of the second high-voltage N-type tube is connected with the drain electrode of the first P-type tube, the source electrode of the second high-voltage N-type tube is connected with the drain electrode of the third N-type tube, the drain electrode of the third high-voltage N-type tube is connected with the drain electrode of the second P-type tube, and the source electrode of the third high-voltage N-type tube is connected with the drain electrode of the fourth N-type tube through the negative feedback unit;
and the grid electrodes of the first high-voltage N-type tube, the second high-voltage N-type tube and the third high-voltage N-type tube are connected to the second end of the resistor.
Optionally, the current forming unit is a self-bias current source or a resistor line.
Optionally, the second N-type tube and the fourth N-type tube have the same size, and the third N-type tube has a smaller size than the second N-type tube and the fourth N-type tube.
Optionally, the negative feedback unit comprises a second unidirectional conduction part capable of forming a second designated pressure drop and a feedback N-type tube;
the input end of the second unidirectional conduction part is connected with the voltage output end, the output end of the second unidirectional conduction part is connected with the source electrode of the feedback N-type tube, the drain electrode of the feedback N-type tube is directly or indirectly connected with the grid electrode of the main P-type tube, the grid electrode of the feedback N-type tube is connected with bias voltage, and the source electrode of the feedback N-type tube is directly or indirectly grounded.
Optionally, the second unidirectional conducting portion includes a plurality of first diodes or second zener diodes in cascade.
Optionally, the first unidirectional conducting portion includes a plurality of second diodes or third zener diodes in cascade.
Optionally, the first P-type tube and the second P-type tube have the same size, the main P-type tube is a high-voltage P-type tube, and the main N-type tube is a high-voltage N-type tube.
According to a second aspect of the present invention there is provided an electronic device comprising the input-output management circuit of the power supply of the first aspect and alternatives thereof.
In the input/output management circuit and the electronic equipment of the power supply, the control of the first P-type tube and the second P-type tube which are used as mirror current sources is based on the regulating unit, so that the on/off control of the main P-type tube is realized, and furthermore, when the voltage is lower, the voltage can be output by the main P-type tube, the voltage at the moment can be changed along with the change of the input voltage, and when the voltage is higher, the stable voltage can be output by the main N-type tube. Meanwhile, the invention realizes negative feedback control for the main P-type tube by using the negative feedback unit, when the input voltage rises to a certain extent, the output voltage of the main P-type tube can not rise along with the input voltage, and further, when the output voltage needs to be converted into the output voltage by using the main N-type tube, obvious jump can not or is not easy to generate. Therefore, the invention not only realizes the stable low voltage from the high input voltage, but also avoids or mitigates the jump situation.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of the relationship between input voltage and output voltage in an embodiment of the present invention;
FIG. 2 is a schematic diagram of an I/O management circuit of a power supply according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a power input/output management circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a power input/output management circuit according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of the I/O circuit of the power supply according to an embodiment of the invention;
FIG. 6 is a diagram illustrating the relationship between input voltage and output voltage according to an embodiment of the present invention.
Reference numerals illustrate:
1-a negative feedback unit;
11-a second unidirectional conductive portion;
2-an adjusting unit;
21-a current forming section;
3-a first unidirectional conductive portion;
p1-a first P-type tube;
p2-a second P-type tube;
p0-main P-type tube;
n0-main N-type tube;
n1-a first N-type tube;
n2-a second N-type tube;
n3-third N-type tube;
n4-fourth N-type tube;
NHV 1-first high pressure N-type tube;
NHV 2-second high pressure N-tube;
NHV 3-third high pressure N-type tube;
r-resistance;
z1-first Zener diode.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
For convenience in describing the technical effects of the embodiments of the present invention, an input voltage and an output voltage formed by the scheme different from the scheme of the present invention will be described with reference to fig. 1.
In the interface circuits of various electronic products, it is generally considered that the power input pins of the interface can bear a voltage higher than the voltage which is tolerated by the system circuits inside the electronic products, so that when some circuits inside the system need to take the voltage of the interface to start working, the possible high voltage of the interface needs to be transferred to the low voltage supported by the internal circuits through the circuits. The circuit provided by the embodiment of the invention can meet the requirement.
Referring to fig. 2, an embodiment of the present invention provides an input/output management circuit of a power supply, which includes a first P-type tube P1, a second P-type tube P2, a main P-type tube P0, a main N-type tube N0, an adjusting unit 2, a negative feedback unit 1, a resistor R, and a first unidirectional conducting portion 3 capable of forming a first designated voltage drop.
The source electrodes of the first P-type tube P1 and the second P-type tube P2 are connected to the voltage input end, the grid electrode of the first P-type tube P1 is connected with the grid electrode of the second P-type tube P2, the grid electrode of the first P-type tube P1 is also connected with the drain electrode of the first P-type tube P1, the first P-type tube P1 and the second P-type tube P2 can be P-type tubes with the same size, and therefore the first P-type tube P1 and the second P-type tube P2 can form mirror current sources.
The drain electrode of the first P-type pipe P1 is connected with the regulating unit 2, the drain electrode of the second P-type pipe P2 is connected with the grid electrode of the main P-type pipe P0, the first end of the resistor R is connected to the voltage input end, the second end of the resistor R is connected with the input end of the first unidirectional conduction part 3, the output end of the first unidirectional conduction part 3 is grounded, the grid electrode of the main P-type pipe P0 is connected with the drain electrode of the second P-type pipe, the grid electrode of the main P-type pipe P0 is also directly or indirectly connected with the negative feedback unit 1, the source electrode of the main P-type pipe P0 is connected with the voltage input end, the drain electrode of the main P-type pipe P0 is connected with the voltage output end, the source electrode of the main N-type pipe N0 is connected with the voltage input end, the grid electrode of the main N-type pipe N0 is connected with the second end of the resistor R, and the negative feedback unit is also connected with the voltage output end.
The voltage input terminal is understood to be a circuit node which can be connected to the input voltage Vin, and can be a separate connection terminal or any circuit node in a circuit or a device. The voltage output terminal can be understood as a circuit node capable of outputting the output voltage Vout to the outside, and may be a separate connection terminal, or may refer to any circuit node in a circuit or a device.
The adjusting unit 2 is used for:
when the input voltage Vin of the voltage input end is lower than a first voltage threshold value, the main P-type tube is conducted by adjusting the current of the first P-type tube and the second P-type tube so as to output voltage by utilizing the drain electrode of the main P-type tube, and the output voltage can be output through a voltage output end;
when the input voltage Vin is higher than the first voltage threshold, the main P-type tube is cut off by adjusting the current of the first P-type tube and the second P-type tube so as to output voltage by using the source electrode of the main N-type tube, and the output voltage can be output through a voltage output end.
The main P type pipe P0 can be a high-voltage P type pipe, but the implementation modes of other voltage and power P type pipes are not excluded; the main N-type tube N0 may be a high-voltage N-type tube, but other embodiments using other voltage and power P-type tubes are not excluded.
In the case that the negative feedback unit 1 is not used, referring to fig. 1, when the main P-type tube P0 is turned off, the main N-type tube N0 is turned on to supply the output voltage terminal, so as to output the output voltage Vout, but the main N-type tube N0 has a threshold loss of a gate-source voltage difference Vgs (which can be understood as a gate-source voltage difference for turning on the main N-type tube N0), so that a downward jump can be seen at the voltage output terminal, which can be in the downward jump of the output voltage Vout shown in fig. 1, and thus, the output voltage Vout needs to be kept at a lower voltage required by the system when the input voltage Vin is higher. The resistor R and the first unidirectional conducting portion 3 can be used for setting the voltage va=vout+vgs of the VA node, and the value of the output voltage Vout at this time is the value expressed by the middle transverse line portion of the output voltage Vout.
As can be seen, referring to fig. 1, when the input voltage Vin is higher than a certain value, the output voltage Vout will jump downward. Therefore, when the value of the input voltage VIN changes, the voltage of the output voltage Vout will jump back and forth, which may cause a larger ripple of the operation of the following circuit and may cause a problem of jitter of the reference voltage inside the chip or cause erroneous judgment of various circuit logics.
To solve this problem, the embodiment of the present invention introduces the negative feedback unit 1.
The negative feedback unit 1 is used for:
and when the input voltage is lower than a first voltage threshold and higher than a second voltage threshold, the main P-type tube is adjusted in a feedback mode according to the voltage of the voltage output end, so that the output voltage of the voltage output end is kept at a specified voltage, and the specified voltage is matched with the second voltage threshold.
The specified voltage may refer to a single specified voltage value, may refer to a specified voltage range, may be equal to the second voltage threshold, may form a certain voltage difference with the second voltage threshold, and may be a certain range in which the second voltage threshold floats up and down, or may be a certain range greater than or less than the second voltage threshold.
In the scheme, based on the control of the adjusting unit on the first P-type tube and the second P-type tube which are used as mirror current sources, the on-off control of the main P-type tube is realized, and when the voltage is lower, the voltage can be output by the main P-type tube, the voltage at the moment can be changed along with the change of the input voltage, and when the voltage is higher, the stable voltage can be output by the main N-type tube. Meanwhile, the embodiment of the invention realizes negative feedback control for the main P-type tube by using the negative feedback unit, and when the input voltage rises to a certain degree, the output voltage of the main P-type tube can not rise along with the negative feedback control, and further, when the output voltage needs to be converted into the output voltage by using the main N-type tube, obvious jump can not or is not easy to generate. Therefore, the embodiment of the invention not only realizes the stable low voltage from the high input voltage, but also avoids or reduces the jump situation.
In one embodiment, referring to fig. 3 and 5, the adjusting unit 2 includes a current forming portion 21, a first N-type tube N1, a second N-type tube N2, a third N-type tube N3, and a first zener diode Z1; the drain electrode of the second P-type tube P2 is grounded to the fourth N-type tube N4 through the negative feedback unit, and the drain electrode of the fourth N-type tube N4 is connected to the drain electrode of the second P-type tube P2 through the negative feedback unit 1.
The drain electrode of the first N-type tube N1 is connected to the voltage input end through the current forming portion 21, the drain electrode of the second N-type tube N2 is directly or indirectly connected to the positive electrode of the first zener diode Z1, the negative electrode of the first zener diode Z1 is connected to the drain electrode of the first P-type tube P1, the drain electrode of the third N-type tube N3 is directly or indirectly connected to the drain electrode of the first P-type tube P1, the sources of the first N-type tube N1, the second N-type tube N2, the third N-type tube N3 and the fourth N-type tube N4 are all grounded, the gates of the first N-type tube N1, the second N-type tube N2, the third N-type tube N3 and the fourth N-type tube N4 are connected together, and the gate electrode of the first N-type tube is connected to the drain electrode.
The current forming section 21 is configured to determine a current I1 of the first N-type pipe N1. The current forming unit 21 is a self-bias current source or a resistor line. Further, the current I1 of the first N-type tube N1 may be a current obtained by a self-bias current source or a resistor line.
The first N-type tube N1, the second N-type tube N2, the third N-type tube N3 and the fourth N-type tube N4 can form a mirror current source, and then a pull-down current I2, a pull-down current I3 and a pull-down current I4 are generated in the second N-type tube N2, the third N-type tube N3 and the fourth N-type tube N4.
The second N-type tube N2 and the fourth N-type tube N4 have the same size, and the third N-type tube N3 has a size smaller than the second N-type tube N2 and the fourth N-type tube N4.
For further example, the ratio of the sizes of the second N-type tube N2, the third N-type tube N3, and the fourth N-type tube N4 may be as follows: n3:n4:n2=1:2:2, while the ratio of tube sizes between the first P-type tube P1 and the second P-type tube P2 may be, for example: p1:p2=1:1 this ratio can be adjusted arbitrarily under certain conditions and is not limited to this example.
When the second N-type tube N2, the third N-type tube N3 and the fourth N-type tube N4 are in the saturation region, the tube size ratio N2:N3:N4 can be approximately equal to the corresponding current ratio I2:I3:I4.
In a further scheme, the adjusting unit 2 further includes a first high-voltage N-type tube NHV1 and a second high-voltage N-type tube NHV2, and a third high-voltage N-type tube NHV3 (specifically, may be disposed between the drain of the second P-type tube P2 and the second unidirectional conducting portion 11 in the feedback unit 1) is disposed between the fourth N-type tube N4 and the drain of the second P-type tube P2.
The drain electrode of the first high-voltage N-type tube NHV1 is connected with the positive electrode of the first Zener diode Z1, the source electrode of the first high-voltage N-type tube NHV1 is connected with the drain electrode of the second N-type tube N2, the drain electrode of the second high-voltage N-type tube NHV2 is connected with the drain electrode of the first P-type tube P1, the source electrode of the second high-voltage N-type tube NHV2 is connected with the drain electrode of the third N-type tube N3, the drain electrode of the third high-voltage N-type tube NHV3 is connected with the drain electrode of the second P-type tube P2, and the source electrode of the third high-voltage N-type tube NHV3 is connected with the drain electrode of the fourth N-type tube N4 through the negative feedback unit 1.
And the grid electrodes of the first high-voltage N-type tube NHV1, the second high-voltage N-type tube NHV2 and the third high-voltage N-type tube NHV3 are connected to the second end of the resistor.
The first high-voltage N-type tube NHV1, the second high-voltage N-type tube NHV2, and the third high-voltage N-type tube NHV3 are high-voltage NMOS tubes, which can be used to protect the second N-type tube N2, the third N-type tube N3, and the fourth N-type tube N4, and the second N-type tube N2, the third N-type tube N3, and the fourth N-type tube N4 can be low-voltage NMOS tubes, respectively.
The first unidirectional conducting unit 3 and the resistor R may be used to generate a bias voltage, and the bias voltage may be used to power the gates of the first high voltage N-type pipe NHV1, the second high voltage N-type pipe NHV2, the third high voltage N-type pipe NHV3, and the main N-type pipe N0 (which may be a high voltage N-type pipe).
The first unidirectional conducting portion 3 comprises a plurality of second diodes or third zener diodes in cascade connection. If the third zener diode is selected, assuming that the breakdown voltage bv (z 3) =6v of the third zener diode, when the input voltage Vin > bv (z 3), the third zener diode in the first unidirectional conduction portion 3 will be clamped, and the voltage of the VA node may be such that va=bv (z 3); the source voltages of the first high-voltage N-type tube NHV1, the second high-voltage N-type tube NHV2, the third high-voltage N-type tube NHV3 and the main N-type tube N0 are limited to be lower than the voltage value of VA-Vgs, so that the low-voltage NMOS tubes (namely the second N-type tube N2, the third N-type tube N3 and the fourth N-type tube N4) are protected; the Vgs may be a gate-source voltage difference for conducting the first high-voltage N-type tube NHV1, the second high-voltage N-type tube NHV2, the third high-voltage N-type tube NHV3, and the main N-type tube N0.
When the voltage of the input voltage Vin is low, the paths of the first zener diode Z1 and the second high voltage N-type tube NHV1 are turned off, the source-drain voltage Vds of the second N-type tube N2 is close to 0, the second N-type tube N2 works in the linear region, the pull-down current I2 is also close to 0, the mirrored current of the second P-type tube P2 is the pull-down current I3, I4> I3, so that the VB node is pulled down, the fourth N-type tube N4 enters the linear region, the source-drain voltage Vds (i.e. Vds (N4)) of the fourth N-type tube N4 is stabilized at a proper value, so that the source-drain current (i.e. Ids (N4)) of the fourth N-type tube N4 is equal to the pull-down current i.e. v3, and the voltage vb=vds (NHV 3) +vds (N4) of the VB node is close to 0, so that the main P-type tube P0 is turned on.
When VIN > |vgs (P1) |+bv (Z1) +vds (NHV 2) +vdsat (N2), the second N-type tube N2 enters the saturation region, i2=i4, the second P-type tube P2 mirrors the past current i2+i3> I4, so the second P-type tube P2 enters the linear region, stabilizes at Vds (P2) such that Ids (P2) =i4, and at this time the main P-type tube P0 is turned off, the main N-type tube N0 is turned on to supply power to the output voltage terminal, and at this time, as mentioned above, the main N-type tube N0 has a threshold loss of Vgs, and if not processed, the voltage output terminal can see a downward jump.
In one embodiment, referring to fig. 4 and fig. 5, the negative feedback unit 1 includes a second unidirectional conducting portion 11 capable of forming a second designated voltage drop and a feedback N-type tube N5.
The input end of the second unidirectional conduction part 11 is connected with the voltage output end, the output end of the second unidirectional conduction part 11 is connected with the source electrode of the feedback N-type tube N5, the drain electrode of the feedback N-type tube N5 is directly or indirectly connected with the grid electrode of the main P-type tube P0, the grid electrode of the feedback N-type tube N5 is connected with the bias voltage Vncas, and the source electrode of the feedback N-type tube N5 is directly or indirectly grounded.
Further, the second unidirectional conducting portion 11 may include a plurality of first diodes or second zener diodes in cascade.
If the second unidirectional conducting portion 11 employs a plurality of first diodes in cascade, a voltage drop of about 2.8V may be formed in some examples, and the input voltage Vin and the output voltage Vout may be formed in specific examples as shown in fig. 6.
In the graphs shown in fig. 1 and 6, the abscissa represents time and the ordinate represents voltage.
With the variation of the input voltage Vin, the circuit shown in fig. 5 can form three operating states (for example, three regions A, B, C shown in fig. 6 correspond to One, two, three operating states respectively):
in the working state One, the main P-type pipe P0 is in a conducting state, the input voltage Vin is smaller, the second unidirectional conducting part is cut off, and the main P-type pipe P0 is conducted to supply power to the voltage output end;
in the working state Two, it can be understood as an operational amplifier working state, and the grid electrode of the feedback N-type tube N5 is supplied with a bias voltage Vncas. The voltage output end, the second unidirectional conduction part 11, the feedback N-type tube N5, the third high-voltage N-type tube NHV3 and the main P-type tube P0 form an operational amplifier mode, negative feedback is realized, and then the operational amplifier can be used for making: when Vin is in the region B shown in fig. 6 below, the output voltage Vout remains constant at a voltage.
In the working state Three, the main N-type tube N0 is independently in a state of supplying power to the voltage output terminal: when the input voltage Vin continues to rise, the output voltage Vout is pulled up by the main N-type tube N0, and the source of the feedback N-type tube N5 is pulled up and then turned off, so that i4=0, and at this time, the pull-up current of the second P-type tube P2 enters the linear region and pulls the VB node voltage VB to the input voltage Vin, and the main P-type tube P0 is turned off.
The embodiment of the invention also provides electronic equipment, which comprises the power supply input/output management circuit related to the alternative scheme.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (9)
1. The power supply input/output management circuit is characterized by comprising a first P-type tube, a second P-type tube, a main N-type tube, an adjusting unit, a negative feedback unit, a resistor and a first unidirectional conduction part capable of forming a first designated voltage drop;
the grid electrode of the first P type pipe is connected with the grid electrode of the second P type pipe, the grid electrode of the first P type pipe is also connected with the drain electrode of the first P type pipe, the drain electrode of the first P type pipe is connected with the regulating unit, the drain electrode of the second P type pipe is connected with the grid electrode of the main P type pipe, the first end of the resistor is connected with the voltage input end, the second end of the resistor is connected with the input end of the first unidirectional conduction part, the output end of the first unidirectional conduction part is grounded, the grid electrode of the main P type pipe is connected with the drain electrode of the second P type pipe, the grid electrode of the main P type pipe is also directly or indirectly connected with the negative feedback unit, the source electrode of the main P type pipe is connected with the voltage input end, the drain electrode of the main P type pipe is connected with the voltage output end, the drain electrode of the main N type pipe is connected with the voltage input end, the output end of the main N type pipe is connected with the negative feedback unit, and the grid electrode of the main P type pipe is connected with the voltage output end of the negative feedback unit;
the adjusting unit is used for:
when the input voltage of the voltage input end is lower than a first voltage threshold value, the current of the first P-type tube and the second P-type tube is regulated to enable the main P-type tube to be conducted so as to utilize the drain electrode output voltage of the main P-type tube;
when the input voltage is higher than the first voltage threshold, the main P-type tube is cut off by adjusting the current of the first P-type tube and the second P-type tube so as to utilize the source electrode output voltage of the main N-type tube;
the negative feedback unit is used for:
when the input voltage is lower than a first voltage threshold and higher than a second voltage threshold, the main P-type tube is adjusted in a feedback mode according to the voltage of the voltage output end, so that the output voltage of the voltage output end is kept at a specified voltage, and the specified voltage is matched with the second voltage threshold;
the negative feedback unit comprises a second unidirectional conduction part and a feedback N-type tube, wherein the second unidirectional conduction part can form a second designated voltage drop;
the input end of the second unidirectional conduction part is connected with the voltage output end, the output end of the second unidirectional conduction part is connected with the source electrode of the feedback N-type tube, the drain electrode of the feedback N-type tube is directly or indirectly connected with the grid electrode of the main P-type tube, the grid electrode of the feedback N-type tube is connected with bias voltage, and the source electrode of the feedback N-type tube is directly or indirectly grounded.
2. The power supply input/output management circuit according to claim 1, wherein the regulating unit includes a current forming section, a first N-type tube, a second N-type tube, a third N-type tube, and a first zener diode; the drain electrode of the second P-type tube is grounded with a fourth N-type tube through the negative feedback unit, and the drain electrode of the fourth N-type tube is connected to the drain electrode of the second P-type tube through the negative feedback unit;
the drain electrode of the first N-type tube is connected to the voltage input end through the current forming part, the drain electrode of the second N-type tube is directly or indirectly connected to the positive electrode of the first Zener diode, the negative electrode of the first Zener diode is connected with the drain electrode of the first P-type tube, the drain electrode of the third N-type tube is directly or indirectly connected with the drain electrode of the first P-type tube, the source electrodes of the first N-type tube, the second N-type tube, the third N-type tube and the fourth N-type tube are all grounded, the grid electrodes of the first N-type tube, the second N-type tube, the third N-type tube and the fourth N-type tube are connected together, and the grid electrode of the first N-type tube is connected with the drain electrode;
the current forming part is used for determining the current of the first N-type tube.
3. The power supply input/output management circuit according to claim 2, wherein the adjusting unit further comprises a first high-voltage N-type tube, a second high-voltage N-type tube, and a third high-voltage N-type tube is arranged between the fourth N-type tube and the drain electrode of the second P-type tube;
the drain electrode of the first high-voltage N-type tube is connected with the positive electrode of the first Zener diode, the source electrode of the first high-voltage N-type tube is connected with the drain electrode of the second N-type tube, the drain electrode of the second high-voltage N-type tube is connected with the drain electrode of the first P-type tube, the source electrode of the second high-voltage N-type tube is connected with the drain electrode of the third N-type tube, the drain electrode of the third high-voltage N-type tube is connected with the drain electrode of the second P-type tube, and the source electrode of the third high-voltage N-type tube is connected with the drain electrode of the fourth N-type tube through the negative feedback unit;
and the grid electrodes of the first high-voltage N-type tube, the second high-voltage N-type tube and the third high-voltage N-type tube are connected to the second end of the resistor.
4. The input/output management circuit of a power supply according to claim 2, wherein the current forming section is a self-bias current source or a resistance line.
5. The power input/output management circuit according to claim 2, wherein the second N-type tube and the fourth N-type tube have the same size, and the third N-type tube has a smaller size than the second N-type tube and the fourth N-type tube.
6. The power supply input/output management circuit according to claim 1, wherein the second unidirectional conduction portion includes a plurality of first diodes or second zener diodes in cascade.
7. The input-output management circuit according to any one of claims 1 to 5, wherein the first unidirectional conduction portion includes a plurality of second diodes or third zener diodes in cascade.
8. The power input/output management circuit according to any one of claims 1 to 5, wherein the first P-type tube and the second P-type tube have the same size, the main P-type tube is a high voltage P-type tube, and the main N-type tube is a high voltage N-type tube.
9. An electronic device comprising the input-output management circuit of the power supply according to any one of claims 1 to 8.
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| CN202110498672.XA CN113162415B (en) | 2021-05-08 | 2021-05-08 | Input/output management circuit of power supply and electronic equipment |
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