CN117713506A - Low-power consumption power supply with wide output voltage range - Google Patents

Low-power consumption power supply with wide output voltage range Download PDF

Info

Publication number
CN117713506A
CN117713506A CN202410167068.2A CN202410167068A CN117713506A CN 117713506 A CN117713506 A CN 117713506A CN 202410167068 A CN202410167068 A CN 202410167068A CN 117713506 A CN117713506 A CN 117713506A
Authority
CN
China
Prior art keywords
switching tube
power supply
twenty
output end
current
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.)
Granted
Application number
CN202410167068.2A
Other languages
Chinese (zh)
Other versions
CN117713506B (en
Inventor
请求不公布姓名
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Baker Microelectronics Co Ltd
Original Assignee
Suzhou Baker Microelectronics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Suzhou Baker Microelectronics Co Ltd filed Critical Suzhou Baker Microelectronics Co Ltd
Priority to CN202410167068.2A priority Critical patent/CN117713506B/en
Publication of CN117713506A publication Critical patent/CN117713506A/en
Application granted granted Critical
Publication of CN117713506B publication Critical patent/CN117713506B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to the technical field of power supply circuits, and discloses a low-power consumption power supply with a wide output voltage range, which comprises: an external power supply detection circuit, a first voltage generation circuit, and a second voltage generation circuit; the external power supply detection circuit is powered by a control power supply; the first voltage generation circuit is used for outputting voltage corresponding to the external power supply when the external power supply meets the power supply requirement; the second voltage generating circuit is used for converting the input power supply and outputting the converted voltage when the external power supply does not meet the power supply requirement. The invention can control different voltage generating circuits to supply power to the outside, and the external power supply meeting the power supply requirement can work in a wider voltage range, so that the low-power consumption power supply can have a wider output voltage range. In addition, when the first voltage generating circuit works, the power consumption of the external power supply is consumed, so that the power consumption of the low-power-consumption power supply with the wide output voltage range can be greatly reduced.

Description

Low-power consumption power supply with wide output voltage range
Technical Field
The invention relates to the technical field of power supply circuits, in particular to a low-power consumption power supply with a wide output voltage range.
Background
Switching power supply circuits typically include a power circuit and an integrated circuit control chip that controls the supply voltage or reference voltage for each module within the chip, typically generated directly from an on-chip power supply.
However, the conventional internal power supply of the chip generally only can generate a fixed value of output voltage, and when the integrated circuit control chip is used in a switching power supply circuit of different application scenarios, different supply voltages or reference voltages are required for each module in the chip, so that the internal power supply of the integrated circuit control chip cannot be suitable for the switching power supply circuit of multiple scenarios.
Disclosure of Invention
In view of this, the present invention provides a low power consumption power supply with a wide output voltage range, so as to solve the problem that the voltage generating circuit cannot be applied to multiple scenarios.
In a first aspect, the present invention provides a low power consumption power supply of a wide output voltage range, comprising: an external power supply detection circuit, a first voltage generation circuit, and a second voltage generation circuit;
the external power supply detection circuit is powered by a control power supply; the output end of the external power supply detection circuit is connected with the input ends of the first voltage generation circuit and the second voltage generation circuit;
The external power supply detection circuit is configured to detect whether the external power supply meets the power supply requirement; under the condition that the external power supply meets the power supply requirement, the output end of the external power supply detection circuit outputs a first control signal; under the condition that the external power supply does not meet the power supply requirement, the output end of the external power supply detection circuit outputs a second control signal;
the first voltage generation circuit is configured to: outputting a voltage corresponding to the external power source in response to the first control signal;
the second voltage generation circuit is configured to: and responding to the second control signal, converting the input power supply and outputting the converted voltage.
In a second aspect, the present invention provides a semiconductor integrated circuit control chip, comprising the low power consumption power supply with a wide output voltage range as described in the first aspect.
In a third aspect, the present invention provides a switching power supply circuit including the semiconductor integrated circuit control chip described in the second aspect.
The invention can control different voltage generating circuits to supply power to the outside, and the external power supply meeting the power supply requirement can work in a wider voltage range, so that the low-power consumption power supply can have a wider output voltage range. And the first voltage generating circuit is powered by an external power supply, and when the first voltage generating circuit works, the power consumption of the external power supply is consumed, so that the power consumption of the low-power-consumption power supply with the wide output voltage range can be greatly reduced, the low-power-consumption power supply with the wide output voltage range is in a low-power-consumption state, and the overall lower power consumption can be ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings that are required to be used in the description of the embodiments or the related art will be briefly described, and it is apparent that the drawings in the description below are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic diagram of a low power consumption power supply with a wide output voltage range according to an embodiment of the present invention;
fig. 2 is a first structural schematic diagram of an external power supply detection circuit according to an embodiment of the present invention;
fig. 3 is a second structural schematic diagram of an external power supply detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a first voltage generation circuit according to an embodiment of the present invention;
fig. 5 is a first structural schematic diagram of a second voltage generating circuit according to an embodiment of the present invention;
fig. 6 is a second structural schematic diagram of a second voltage generating circuit according to an embodiment of the present invention;
fig. 7 is a schematic circuit configuration diagram of a low power consumption power supply with a wide output voltage range according to an embodiment of the present invention.
Reference numerals illustrate:
100. an external power supply detection circuit; 200. a first voltage generation circuit; 300. a second voltage generating circuit; 101. a first hysteresis circuit; 102. a second hysteresis circuit; 201. a response circuit; 202. a switching circuit; b1, a current source; m1, a first switching tube; m2, a second switching tube; m3, a third switching tube; m4, a fourth switching tube; m5, a fifth switching tube; m6, a sixth switching tube; m7, a seventh switching tube; m8, an eighth switching tube; m9, a ninth switching tube; m10, a tenth switching tube; m11, eleventh switching tube; m12, a twelfth switching tube; m13, thirteenth switching tube; m14, a fourteenth switching tube; m15, a fifteenth switching tube; m16, sixteenth switching tube; m17, seventeenth switching tube; m19, nineteenth switching tube; m20, a twentieth switching tube; m21, a twenty-first switching tube; m22, a twenty-second switching tube; m23, a twenty-third switching tube; m24, a twenty-fourth switching tube; m25, a twenty-fifth switching tube; m26, a twenty-sixth switching tube; m27, twenty-seventh switching tube; m28, a twenty eighth switching tube; m29, a twenty-ninth switching tube; m30, a thirty-first switching tube; m0, a power supply switching tube; r1, a first resistor; r2, a second resistor; r3, a third resistor; r4, a fourth resistor; r5, a fifth resistor; r6, a sixth resistor; a1, a first inverter; a2, a second inverter; a3, a third inverter; a4, a fourth inverter; z1, a zener diode.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In this embodiment, a low power consumption power supply with a wide output voltage range is provided, as shown in fig. 1, and includes: an external power supply detection circuit 100, a first voltage generation circuit 200, and a second voltage generation circuit 300.
The external power supply detection circuit 100 is supplied with power from the control power supply VDD; the output terminal of the external power supply detection circuit 100 is connected to the input terminals of the first voltage generation circuit 200 and the second voltage generation circuit 300.
The external power supply detection circuit 100 is configured to detect whether the external power supply EVIN meets a power supply requirement; under the condition that the external power supply EVIN meets the power supply requirement, the output end of the external power supply detection circuit 100 outputs a first control signal; in the case where the external power supply EVIN does not meet the power supply requirement, the output terminal of the external power supply detection circuit 100 outputs the second control signal.
And, the first voltage generating circuit 200 is configured to: in response to the first control signal, outputting a voltage VOUT corresponding to the external power supply EVIN; the second voltage generation circuit 300 is configured to: in response to the second control signal, the input power supply VIN is converted, and the converted voltage VOUT is output.
In this embodiment, the low-power supply is divided into circuits of different parts, and different power supplies are used for supplying power; as shown in fig. 1, the external power supply detection circuit 100 is supplied with the control power supply VDD, and the second voltage generation circuit 300 is supplied with the power supply VIN. The external power supply detection circuit 100 mainly generates a control signal, which may be supplied by a control power supply VDD, for example, the control power supply VDD may be a low-voltage power supply; the second voltage generating circuit 300 needs to output a certain voltage VOUT to supply power to other circuits, for example, a power supply voltage or a reference voltage may be provided to an internal module of the chip, and the second voltage generating circuit 300 may be powered by the power supply VIN; for example, the power supply VIN has a higher voltage than the control power supply VDD.
For example, when the chip works, a corresponding power supply needs to be provided for the chip, and in this embodiment, the power supply can be used as a power supply VIN, and the power supply VIN is also the power supply of the chip; and, the chip can generate a low-power consumption voltage source inside, and the low-power consumption voltage source can be used as the control power supply VDD. In addition, when the low power consumption voltage source is a low power consumption low voltage source, the external power supply detection circuit 100 can be made to work in a low voltage scene by providing the external power supply detection circuit 100 with a lower control power supply VDD, so that the power consumption of the external power supply detection circuit 100 can be effectively reduced.
The first voltage generation circuit 200 may input another external power supply EVIN and may output a voltage VOUT corresponding to the external power supply EVIN. For example, the first voltage generating circuit 200 may convert the external power supply EVIN to externally output the corresponding voltage VOUT; alternatively, the first voltage generating circuit 200 may control the on-off of the external power supply EVIN loop to output the external power supply EVIN when the loop is turned on, and the output voltage VOUT is equal to the voltage of the external power supply EVIN.
When the low-power consumption power supply with the wide output voltage range works, a control power supply VDD and a power supply VIN are required to be provided for the low-power consumption power supply; for example, after the chip is powered on, it can provide the chip power supply and the low power voltage source for the low power supply with a wide output voltage range, which are respectively used as the power supply VIN and the control power VDD required by the low power supply with a wide output voltage range. When the voltage VOUT needs to be output from the first voltage generation circuit 200, the external power supply EVIN needs to be supplied to the first voltage generation circuit 200.
The working principle of the low-power consumption power supply with the wide output voltage range is as follows.
The external power supply detection circuit 100 may detect the input external power supply EVIN, and if the external power supply EVIN meets the power supply requirement, the first voltage generation circuit 200 may output the voltage VOUT to supply power to the outside. Specifically, the external power supply detection circuit 100 may output a first control signal, and the first voltage generation circuit 200 may output a voltage VOUT corresponding to the external power supply EVIN after receiving the first control signal. Also, the second voltage generating circuit 300 does not respond to the first control signal; for example, after the second voltage generating circuit 300 receives the first control signal, the second voltage generating circuit 300 may be in an off state, i.e., the second voltage generating circuit 300 does not operate. When the power is supplied from the first voltage generating circuit 200, the power consumption of the external power supply EVIN is consumed, and the internal power consumption of the chip is not substantially consumed, that is, the power consumption of the power supply VIN is not substantially consumed, so that the low power consumption power supply with a wide output voltage range can be in a low power consumption state.
In addition, the external power supply EVIN may not meet the power supply requirements; for example, the external power supply EVIN is not currently input; or the external power supply EVIN voltage is too small; alternatively, it is currently required to output a smaller voltage, but the external power supply EVIN is excessively high in voltage. If the external power supply EVIN does not meet the power supply requirement, the second voltage generating circuit 300 needs to output the voltage VOUT. At this time, the first voltage generation circuit 200 is not operated, that is, the control signal output from the external power supply detection circuit 100 can select one of the first voltage generation circuit 200 and the second voltage generation circuit 300 to be in an operating state.
Specifically, the external power supply detection circuit 100 may output a second control signal that can be responded to by the second voltage generation circuit 300. After receiving the second control signal, the second voltage generating circuit 300 may convert the received power supply VIN, thereby outputting a corresponding voltage VOUT. Also, the first voltage generating circuit 200 does not respond to the second control signal; for example, after the first voltage generating circuit 200 receives the second control signal, the first voltage generating circuit 200 may be in an off state, i.e., the first voltage generating circuit 200 does not operate.
The low-power consumption power supply can control the working conditions of the first voltage generating circuit 200 and the second voltage generating circuit 300 according to the requirement, so that different voltages VOUT can be externally output; in addition, the external power supply EVIN is variable, and the voltage of the external power supply EVIN can be changed within a certain range, so that when the first voltage generating circuit 200 supplies power to the outside, the external power supply EVIN with different voltages can be connected, and the corresponding voltage VOUT can be output to the outside, so that the low-power consumption power supply can have a wider output voltage range.
The low-power consumption power supply with the wide output voltage range can control different voltage generating circuits to supply power to the outside, and the external power supply EVIN meeting the power supply requirement can work in a wider voltage range, so that the low-power consumption power supply can have a wider output voltage range. When the first voltage generating circuit 200 works, the power consumption of the external power supply EVIN is consumed, so that the power consumption of the low-power-consumption power supply with the wide output voltage range can be greatly reduced, the low-power-consumption power supply with the wide output voltage range is in a low-power-consumption state, and the overall lower power consumption can be ensured.
In some alternative embodiments, referring to fig. 2, the external power supply detection circuit 100 includes: the switching device comprises a current source B1, a first switching tube M1, a second switching tube M2, a third switching tube M3, a fourth switching tube M4, a fifth switching tube M5, a sixth switching tube M6, a seventh switching tube M7, an eighth switching tube M8, a ninth switching tube M9, a tenth switching tube M10, a first resistor R1, a second resistor R2 and a first inverter A1; the first switching tube M1, the second switching tube M2, the seventh switching tube M7, the eighth switching tube M8, the ninth switching tube M9 and the tenth switching tube M10 are NPN type triodes or N type field effect tubes; the third switching tube M3, the fourth switching tube M4, the fifth switching tube M5 and the sixth switching tube M6 are PNP type triode or P type field effect tube.
In this embodiment, the switching tube has a control end, a current input end and a current output end, which can control whether the current input end and the current output end are conducted under the control action of the control end. For example, if the switching tube is an NPN transistor, the base is a control terminal, the collector is a current input terminal, and the emitter is a current output terminal; if the switching tube is an N-type field effect tube, such as an NMOS tube, the gate is a control terminal, the drain is a current input terminal, and the source is a current output terminal. If the switching tube is a PNP triode, the base electrode is a control end, the emitter electrode is a current input end, and the collector electrode is a current output end; if the switching tube is a P-type field effect tube, such as a PMOS tube, the gate is a control terminal, the source is a current input terminal, and the drain is a current output terminal. Taking the first switching tube M1 and the second switching tube M2 as examples, the first switching tube M1 and the second switching tube M2 may be NPN transistors, or N field effect transistors, which is not limited in this embodiment, and fig. 2 illustrates that both N field effect transistors are used as examples; similarly, the remaining switching tubes in fig. 2 are also field effect transistors.
As shown in fig. 2, the input terminal of the current source B1 is configured to be connected to the control power supply VDD, and the output terminal of the current source B1 is connected to the current input terminal of the first switching tube M1.
The control end of the first switching tube M1 and the control end of the second switching tube M2 are connected with the current input end of the first switching tube M1; the current output end of the first switching tube M1 and the current output end of the second switching tube M2 are grounded.
One end of the first resistor R1 is configured to be connected to the external power supply EVIN, and the other end is grounded through the second resistor R2. As shown in fig. 2, the first resistor R1 and the second resistor R2 form a series structure, and the series structure is connected in series between the external power source EVIN and the Ground (GND).
As shown in fig. 2, the current input ends of the third switching tube M3, the fourth switching tube M4, the fifth switching tube M5 and the sixth switching tube M6 are all configured to be connected to the control power supply VDD.
The control end of the third switching tube M3 and the control end of the fourth switching tube M4 are connected with the current output end of the fourth switching tube M4; the current output end of the third switching tube M3 is connected with the current input end of the ninth switching tube M9, and the current output end of the fourth switching tube M4 is connected with the current input end of the seventh switching tube M7.
The control end of the fifth switching tube M5 and the control end of the sixth switching tube M6 are connected with the current output end of the fifth switching tube M5; the current output end of the fifth switching tube M5 is connected with the current input end of the eighth switching tube M8, and the current output end of the sixth switching tube M6 is connected with the current input end of the tenth switching tube M10 and is connected with the input end of the first inverter A1. And, the output terminal of the first inverter A1 serves as the output terminal of the external power supply detection circuit 100. As shown in fig. 2, point a represents the current output terminal of the sixth switching transistor M6, which is also the input terminal of the first inverter A1, and point B represents the output terminal of the first inverter A1, which is also the output terminal of the external power supply detection circuit 100; it will be appreciated that the point B may provide respective first and second control signals to the first and second voltage generation circuits 200, 300.
The control end of the seventh switching tube M7 is configured to be connected with a first reference voltage VREF1, and the control end of the eighth switching tube M8 is connected with one end of the first resistor R1, which is close to the second resistor R2; the current output end of the seventh switching tube M7 and the current output end of the eighth switching tube M8 are connected with the current input end of the second switching tube M2. The control end of the ninth switching tube M9 and the control end of the tenth switching tube M10 are connected with the current input end of the ninth switching tube M9; the current output terminal of the ninth switching transistor M9 and the current output terminal of the tenth switching transistor M10 are grounded. The parameters of the seventh switching tube M7 and the eighth switching tube M8 are the same, for example, the width-to-length ratio of the seventh switching tube M7 and the eighth switching tube M8 is the same.
In this embodiment, the connection node between the first resistor R1 and the second resistor R2 is referred to as point C, and it can be understood that the voltage VC at the point C is:the method comprises the steps of carrying out a first treatment on the surface of the Wherein R is 1 Is the resistance value of the first resistor, R 2 Is the resistance of the second resistor.
In general, when the external power supply EVIN is large enough, the external power supply EVIN is considered to meet the power supply requirement; therefore, if the first reference voltage VREF1 is smaller than the voltage VC at point C, the external power supply EVIN at this time is considered to meet the power supply requirement. For example, in this case, the point a voltage VA is at a high level, the point B voltage at the output terminal thereof is at a low level by the action of the first inverter A1, and the external power supply detection circuit 100 may output a control signal at a low level, which is the first control signal.
If the first reference voltage VREF1 is greater than the voltage VC at point C, it can be considered that the external power supply EVIN at this time does not meet the power supply requirement; for example, if the external power source EVIN is not currently connected, the point C voltage VC is 0, which is smaller than the first reference voltage VREF1. In this case, the first voltage generation circuit 200 may output a corresponding voltage. For example, the voltage VA at the point a is low, the voltage at the point B at the output terminal is high by the action of the first inverter A1, and the external power supply detection circuit 100 can output a control signal of high level, which is a second control signal.
In the present embodiment, the operation principle of the external power supply detection circuit 100 shown in fig. 2 is specifically as follows.
When the low-power-consumption power supply works, the control power supply VDD is connected; for example, after the chip is connected to the chip power supply, a low-power consumption low-voltage source can be generated inside the chip, and at this time, the chip power supply is used as the power supply VIN, and the low-power consumption low-voltage source is used as the control power supply VDD, so that power can be supplied to the external power supply detection circuit 100. At this time, the current source B1 generates a current, which is referred to as a first current I1 for convenience of description. At this time, the first current I1 pulls up the control ends of the first switching tube M1 and the second switching tube M2, so that the first switching tube M1 and the second switching tube M2 are turned on. Also, the first reference voltage VREF1 may be a reference voltage generated by an internal power supply of the chip. For example, after the chip power supply VIN is connected to the low-power supply with the wide output voltage range, the first reference voltage VREF1 can be input to the control terminal of the seventh switching tube M7.
Specifically, the first reference voltage VREF1 is input to the control terminal of the seventh switching tube M7, so that the seventh switching tube M7 is turned on, and at this time, the control terminal voltages of the third switching tube M3 and the fourth switching tube M4 are pulled down by the turned-on seventh switching tube M7 and the second switching tube M2, and the third switching tube M3 and the fourth switching tube M4 are turned on. Therefore, a current flows in the branch circuit constituted by the fourth switching tube M4, the seventh switching tube M7, and the second switching tube M2; the control terminal voltages of the ninth switching transistor M9 and the tenth switching transistor M10 are pulled up by the third switching transistor M3 that is turned on, and the ninth switching transistor M9 and the tenth switching transistor M10 are turned on. At this time, therefore, current flows also in the branch constituted by the third switching tube M3 and the ninth switching tube M9; meanwhile, since the ninth switching tube M9 and the tenth switching tube M10 constitute a current mirror structure, a point a pull-down current is generated in the tenth switching tube M10, and a point a voltage can be pulled down.
When the external power supply EVIN is not connected to the low-power consumption power supply with the wide output voltage range, the point C voltage is at a low level, the eighth switching tube M8 is turned off, so that the fifth switching tube M5 and the sixth switching tube M6 are also turned off, and the point a voltage is not affected, so that the point a voltage is at a low level, and the point B voltage at the output end of the first inverter A1 is at a high level, so that the external power supply detection circuit 100 can output a second control signal with a high level.
When the external power supply EVIN is connected to the low-power consumption power supply with the wide output voltage range, the C point voltage VC is the divided voltage obtained through the first resistor R1 and the second resistor R2, so that the C point voltage VC can pull up the voltage of the control end of the eighth switching tube M8, and the eighth switching tube M8 is conducted; after that, the control terminal voltages of the fifth switching tube M5 and the sixth switching tube M6 are pulled down through the turned-on eighth switching tube M8 and second switching tube M2, and the fifth switching tube M5 and the sixth switching tube M6 are turned on, so that the current flows in the branch circuit formed by the fifth switching tube M5, the eighth switching tube M8 and the second switching tube M2, and meanwhile, the fifth switching tube M5 and the sixth switching tube M6 form a current mirror structure, so that the charging current of the point a is generated in the sixth switching tube M6, and the point a voltage can be pulled up.
At this time, the current flowing through the seventh switching transistor M7 is the second current I2, and the current flowing through the eighth switching transistor M8 is the third current I3. As can be seen from the structure shown in fig. 2, the second current I2 flowing through the seventh switching tube M7 has a linear relationship with the current flowing through the third switching tube M3, and is specifically related to the width-to-length ratio of the third switching tube M3 and the fourth switching tube M4; if the width-to-length ratio of the third switching tube M3 and the fourth switching tube M4 is the same, the second current i2=the current flowing through the third switching tube M3 flows through the seventh switching tube M7.
Current flowing through the third switching tube M3=current flowing through the ninth switching tube M9, and similarly, current flowing through the ninth switching tube M9 has a linear relationship with current flowing through the tenth switching tube M10, and current flowing through the tenth switching tube M10 is a pull-down current at point a.
The third current flowing through the eighth switching tube M8=the current flowing through the fifth switching tube M5, the current flowing through the fifth switching tube M5 and the current flowing through the sixth switching tube M6 have a linear relationship, and the current flowing through the sixth switching tube M6 is the charging current at the point a.
Since the seventh switching tube M7 is connected to the current output terminal of the eighth switching tube M8, the voltage difference between the control terminal of the seventh switching tube M7 and the current output terminal and the voltage difference between the control terminal of the eighth switching tube M8 and the current output terminal are only related to the first reference voltage VREF1 and the point C voltage VC. As is clear from the above, the charging current at the point a and the pull-down current at the point a are also related to the width-to-length ratio of the third switching transistor M3 and the fourth switching transistor M4, the width-to-length ratio of the fifth switching transistor M5 and the sixth switching transistor M6, and the width-to-length ratio of the ninth switching transistor M9 and the tenth switching transistor M10.
If the external power supply EVIN is smaller, the third current I3 is smaller than the second current I2, and the charging current at the point a is smaller than the pull-down current at the point a, so that the point a is still at a low level; conversely, if the external power source EVIN is larger, the third current I3 is larger than the second current I2, which results in the charging current at the point a being larger than the pull-down current at the point a, the voltage at the point a can be pulled high, so the voltage at the point a is at a high level.
For convenience of description, the third switching tube M3 and the fourth switching tube M4 have the same width-to-length ratio, the fifth switching tube M5 and the sixth switching tube M6 have the same width-to-length ratio, and the ninth switching tube M9 and the tenth switching tube M10 have the same width-to-length ratio. The working principle of the circuit structure is described below under the condition that the width-to-length ratio is the same.
In this case, the second current i2=the current flowing through the seventh switching tube M7=the current flowing through the third switching tube M3=the current flowing through the ninth switching tube M9=the current flowing through the tenth switching tube M10=the point a pull-down current, the third current i3=the current flowing through the eighth switching tube M8=the current flowing through the fifth switching tube M5=the current flowing through the sixth switching tube M6=the point a charging current.
When the C-point voltage VC is smaller than the first reference voltage VREF1, i.e., VC<VREF1; due to the voltage at point CI.e. when->At this time, since the current output terminals of the seventh switching tube M7 and the eighth switching tube M8 are connected, the voltage difference between the control terminal and the current output terminal of the seventh switching tube M7 is greater than the voltage difference between the control terminal and the current output terminal of the eighth switching tube M8, and therefore, the second current I2 flowing through the seventh switching tube M7 is greater than the third current I3 flowing through the eighth switching tube M8, that is, the point a pull-down current is greater than the point a charging current, the point a is still at the low level, and the circuit state remains before the external power supply EVIN is connected, that is, the external power supply detection circuit 100 still outputs the second control signal at the high level.
When the C point voltage VC is greater than the first reference voltage VREF1, i.e., whenWhen the voltage difference between the control terminal and the current output terminal of the seventh switching tube M7 is smaller than the voltage difference between the control terminal and the current output terminal of the eighth switching tube M8, the second current I2 flowing through the seventh switching tube M7 is smaller than the third current I3 flowing through the eighth switching tube M8, that is, the point a pull-down current is smaller than the point a charging current, the point a is converted into a high level, the point B voltage at the output terminal of the first inverter A1 is converted into a low level, that is, the external power supply detection circuit 100 outputs the first control signal of a low level.
In this embodiment, the external power supply detection circuit 100 can effectively control whether the external power supply detection circuit 100 works or not by using the first switching tube M1 and the second switching tube M2; by using the plurality of switching transistors, a suitable voltage can be output to the first inverter A1 based on the voltage level of the external power supply EVIN, so that not only low power consumption can be ensured, but also the voltage can be converted into a stable voltage by the first inverter A1, and a uniform low-level control signal or a uniform high-level control signal can be provided for the subsequent first voltage generation circuit 200 and the second voltage generation circuit 300.
Alternatively, if the external power supply EVIN is in When the nearby fluctuation occurs, the voltage at the point A is caused to be suddenly high and suddenly low, so that the voltage at the point B is repeatedly switched between high and low levels; to further improve the wide outputThe safety and reliability of the low-power consumption power supply in the output voltage range are realized by adding a first hysteresis circuit and a second hysteresis circuit into the low-power consumption power supply.
As shown in fig. 3, the external power supply detection circuit 100 further includes: a first hysteresis circuit 101 and a second hysteresis circuit 102; the first hysteresis circuit 101 includes: a third resistor R3 and an eleventh switching tube M11; the eleventh switch M11 is an NPN transistor or an N-type field effect transistor.
In the present embodiment, the second resistor R2 is not directly grounded, but is grounded through the third resistor R3. As shown in fig. 3, one end of the third resistor R3 is connected to one end of the second resistor R2 away from the first resistor R1, and the other end of the third resistor R3 is grounded; namely, the first resistor R1, the second resistor R2 and the third resistor R3 are connected in series in sequence.
The control end of the eleventh switching tube M11 is connected with the output end of the first inverter A1; the current input end of the eleventh switching tube M11 is connected with one end of the third resistor R3, which is close to the second resistor R2, and the current output end of the eleventh switching tube M11 is grounded.
The second hysteresis circuit 102 is configured to supply a charging current flowing to the current input terminal of the tenth switching transistor M10 in the case where the output terminal of the first inverter A1 is at a low level; when the output terminal of the first inverter A1 is at a high level, the second hysteresis circuit 102 does not operate, which corresponds to the absence of the second hysteresis circuit 102; for example, when the external power supply EVIN is sufficiently small, the output terminal of the first inverter A1 may be made high, and the second hysteresis circuit 102 is not operated.
In this embodiment, if the voltage VC at the point C is less than the first reference voltage VREF1, the point a is at a low level, and the output terminal of the first inverter A1 is at a high level, i.e., the point B is at a high level; at this time, the second hysteresis circuit 102 does not work, and the control end of the eleventh switching tube M11 is at a high level, the eleventh switching tube M11 is turned on, and the third resistor R3 is shorted, so the working principle of the external power supply detection circuit 100 is the same as the circuit structure shown in fig. 2, and the details are not repeated here.
If the voltage VC at the point C is greater than the first reference voltage VREF1, the point A is high, the output end of the first inverter A1 is low, and the voltage VC at the point C is greater than the first reference voltage VREF1The second hysteresis circuit 102 may provide a charging current to the current input terminal of the tenth switching tube M10, i.e. the second hysteresis circuit 102 may generate a charging current at point a, further ensuring that the charging current at point a is greater than the pull-down current at point a, thereby ensuring that point a is in a high state. And, the control end of the eleventh switch tube M11 is at a low level, and the eleventh switch tube M11 is turned off, so that the third resistor R3 is connected into the circuit. Therefore, the C point voltage isIn this case, only when the external power supply EVIN is less than +>It is only possible to make point a low; in other words, when the external power supply EVIN is greater than +. >In this case, the point a can still be guaranteed to be at a high level, i.e. the output terminal of the first inverter A1 can still be guaranteed to be at a low level.
Therefore, when the external power supply EVIN is inIn case of nearby wave motion, due to->Greater thanSo the external power supply EVIN is still greater than +.>It is ensured that the output terminal of the first inverter A1 is still at a low level when the external power supply EVIN fluctuates.
Optionally, referring to fig. 3, the second hysteresis circuit 102 includes: a twelfth switching tube M12 and a thirteenth switching tube M13; the twelfth switching tube M12 and the thirteenth switching tube M13 are PNP type triode or P type field effect tube.
The control end of the twelfth switching tube M12 is connected to the control end of the fifth switching tube M5, the current input end of the twelfth switching tube M12 is configured to be connected to the control power supply VDD, and the current output end of the twelfth switching tube M12 is connected to the current input end of the thirteenth switching tube M13. The control end of the thirteenth switching tube M13 is connected with the output end of the first inverter A1, and the current output end of the thirteenth switching tube M13 is connected with the current input end of the tenth switching tube M10.
In this embodiment, if the voltage VC at the point C is less than the first reference voltage VREF1, the output terminal of the first inverter A1 is at a high level, i.e. the point B is at a high level, so the control terminals of the eleventh switching transistor M11 and the thirteenth switching transistor M13 are both at a high level, the eleventh switching transistor M11 is turned on, the thirteenth switching transistor M13 is turned off, and the second hysteresis circuit 102 is turned off, no matter what state the twelfth switching transistor M12 is in, and does not provide additional charging current to the point a.
If the external power supply EVIN is connected to the low power consumption power supply with wide output voltage range and the C point voltageIs greater than the first reference voltage VREF1, i.e., the external power supply EVIN is greater than +.>When the charging current flowing into the point A of the sixth switching tube M6 is larger than the pull-down current flowing into the tenth switching tube M10 from the point A, the point A is converted into a high level, the voltage of the point B at the output end of the first inverter A1 is converted into a low level, the thirteenth switching tube M13 is turned on, and the eleventh switching tube M11 is turned off; and, the turned-on eighth switching tube M8 may pull down the control terminal of the twelfth switching tube M12, so that the twelfth switching tube M12 is turned on.
At this time, the branch circuit formed by the twelfth switching tube M12 and the thirteenth switching tube M13 can generate the charging current flowing into the point a, so that the charging current of the point a can be further ensured to be greater than the pull-down current of the point a, and the point a is ensured to be in a high level state; meanwhile, the third resistor R3 is connected into the circuit, so that only when the external power supply EVIN is smaller thanOnly when the voltage VC at point C is smaller than the first reference voltageVoltage VREF1, the external power supply detection circuit 100 is only likely to switch to output high level, thereby ensuring that when external power supply EVIN is at +.>When the vicinity fluctuates, the control signal output from the external power supply detection circuit 100 is not caused to be repeatedly switched, and the first voltage generation circuit 200 and the second voltage generation circuit 300 are caused to be repeatedly switched, thereby improving the safety and reliability of the low power consumption power supply of the wide output voltage range.
In the embodiment, if the second hysteresis circuit 102 includes only the thirteenth switching transistor M13 and no twelfth switching transistor M12, the voltage at the point a is directly pulled up to the control power VDD by the thirteenth switching transistor M13 after the output terminal of the first inverter A1 is at the low level; after that, even if the eighth switching transistor M8 is turned off and the fifth switching transistor M5 and the sixth switching transistor M6 are turned off, the point a may still be pulled up to the control power VDD, and the current flowing through the tenth switching transistor M10 (i.e., the pull-down current of the point a) cannot pull down the voltage of the point a, which easily causes the external power detection circuit 100 to always output a low level, forming a dead cycle.
If the second hysteresis circuit 102 includes only the twelfth switching transistor M12 and does not include the thirteenth switching transistor M13, first, in order to ensure current balance during normal operation of the circuit, when the voltage at the point C is equal to the first reference voltage VREF1, the charging current flowing into the point a in the sixth switching transistor M6 (in this case, only the sixth switching transistor M6, i.e., without considering the second hysteresis circuit 102) is designed to be equal to the pull-down current flowing from the point a into the tenth switching transistor M10. If the second hysteresis circuit 102 has only the twelfth switching transistor M12, the twelfth switching transistor M12 is turned on as long as the voltage at the point C is greater than the threshold voltage of the eighth switching transistor M8, and at this time, even if the voltage at the point C is smaller than the first reference voltage VREF1, the charging current flowing into the point a (the current flowing through the sixth switching transistor M6+the current flowing through the twelfth switching transistor M12) is obviously greater than the pull-down current flowing from the point a into the tenth switching transistor M10, and thus the current balance cannot be achieved. If the current flowing through the sixth switching transistor M6 and the current flowing through the twelfth switching transistor M12 are designed to be equal to the pull-down current flowing from the point a into the tenth switching transistor M10 in advance, the purpose of increasing the charging current after the voltage at the point a becomes higher cannot be achieved.
In some alternative embodiments, referring to fig. 4, the first voltage generating circuit 200 includes: a response circuit 201 and a switching circuit 202. The response circuit 201 responds to the control signal output from the external power supply detection circuit 100, and outputs a corresponding control signal to the switching circuit 202; the switching circuit 202 does not convert the external power supply EVIN, and is a switch for controlling whether or not the external power supply EVIN is used for power supply.
Specifically, as shown in fig. 4, the input terminal of the response circuit 201 is connected to the output terminal of the external power supply detection circuit 100, for example, the input terminal of the response circuit 201 is connected to the point B of the external power supply detection circuit 100 shown in fig. 2 or the like; an output of the response circuit 201 is connected to a control terminal of the switching circuit 202. The response circuit 201 is configured to convert the first control signal into a third control signal and the second control signal into a fourth control signal. The third control signal and the fourth control signal may be at different high and low levels, for example, the third control signal is at a high level and the fourth control signal is at a low level.
An input terminal of the switching circuit 202 is configured to be connected to an external power supply EVIN, and an output terminal of the switching circuit 202 serves as an output terminal of the first voltage generating circuit 200; the switch circuit 202 is configured such that, when the third control signal is input to the control terminal of the switch circuit 202, the input terminal and the output terminal of the switch circuit 202 are turned on; when the fourth control signal is input to the control terminal of the switching circuit 202, the input terminal and the output terminal of the switching circuit 202 are turned off.
In this embodiment, when the external power supply EVIN meets the power supply requirement, the external power supply detection circuit 100 outputs a first control signal, and the response circuit 201 converts the first control signal into a third control signal and inputs the third control signal to the switch circuit 202; under the action of the third control signal, the input end and the output end of the switch circuit 202 are turned on, so that the output end of the first voltage generating circuit 200 can be connected to the external power supply EVIN, and the external power supply EVIN is directly used for externally supplying power, and the voltage VOUT provided at this time is also the voltage of the external power supply EVIN.
When the external power supply EVIN does not meet the power supply requirement, the external power supply detection circuit 100 outputs a second control signal, and the response circuit 201 converts the second control signal into a fourth control signal and inputs the fourth control signal to the switch circuit 202; under the action of the fourth control signal, the input end and the output end of the switch circuit 202 are turned off, that is, the output end of the first voltage generating circuit 200 is in an off state, and is not connected to the external power supply EVIN, at this time, the first voltage generating circuit 200 does not supply power to the outside, and the second voltage generating circuit 300 can output the required voltage VOUT to the outside.
Optionally, the first control signal is at a low level, and the second control signal is at a high level; as shown in fig. 4, the response circuit 201 may specifically include: a second inverter A2, a third inverter A3, a fourteenth switching tube M14, a fifteenth switching tube M15, a sixteenth switching tube M16, and a seventeenth switching tube M17; the fourteenth switching tube M14 and the fifteenth switching tube M15 are PNP type triode or P type field effect tube, and the sixteenth switching tube M16 and the seventeenth switching tube M17 are NPN type triode or N type field effect tube. And/or, the switching circuit 202 may specifically include: a fourth inverter A4 and an eighteenth switching transistor M18; the eighteenth switching transistor M18 is a P-type field effect transistor.
As shown in fig. 4, an input terminal of the second inverter A2 is connected to an output terminal of the external power supply detection circuit 100, and an output terminal of the second inverter A2 is connected to an input terminal of the third inverter A3.
The current input ends of the fourteenth switching tube M14 and the fifteenth switching tube M15 are connected with the output end of the first voltage generating circuit 200, and can be connected with the output voltage VOUT; the control end of the fourteenth switching tube M14 is connected with the current output end of the fifteenth switching tube M15, and the control end of the fifteenth switching tube M15 is connected with the current output end of the fourteenth switching tube M14.
The control end of the sixteenth switching tube M16 is connected with the output end of the third inverter A3, the current input end of the sixteenth switching tube M16 is connected with the current output end of the fourteenth switching tube M14, and the current output end of the sixteenth switching tube M16 is grounded; the current output of the fourteenth switching transistor M14 is also connected to the control terminal of the switching circuit 202. The current output of the fourteenth switching transistor M14 may be the output of the response circuit 201.
The control end of the seventeenth switching tube M17 is connected with the output end of the second inverter A2, the current input end of the seventeenth switching tube M17 is connected with the current output end of the fifteenth switching tube M15, and the current output end of the seventeenth switching tube M17 is grounded.
As shown in fig. 4, an input terminal of the fourth inverter A4 is connected to an output terminal of the response circuit 201, and an output terminal of the fourth inverter A4 is connected to a control terminal of the eighteenth switching transistor M18; the drain of the eighteenth switching transistor M18 is configured to be connected to the external power supply EVIN, and the source of the eighteenth switching transistor M18 serves as the output terminal of the first voltage generating circuit 200.
In this embodiment, as shown in fig. 4, the power sources connected to the current input ends of the fourteenth switching tube M14 and the fifteenth switching tube M15 may be the voltage VOUT output by the low-power consumption power source.
Referring to fig. 4, if the external power detection circuit 100 outputs the second control signal with a high level, i.e. the point B is at a high level, at this time, the output terminal voltage of the second inverter A2 is at a low level, so the third inverter A3 outputs a high level to the control terminal of the sixteenth switching tube M16, and the control terminal voltage of the seventeenth switching tube M17 is at a low level, so the sixteenth switching tube M16 is turned on and the seventeenth switching tube M17 is turned off. Therefore, the voltage at the control terminal of the fifteenth switching transistor M15 is pulled down by the turned-on sixteenth switching transistor M16, so that the fifteenth switching transistor M15 is turned on, at this time, the control terminal of the fourteenth switching transistor M14 is pulled up to the output voltage VOUT by the fifteenth switching transistor M15, and since the voltage at the current input terminal of the fourteenth switching transistor M14 is also the output voltage VOUT, at this time, the fourteenth switching transistor M14 is turned off, and therefore, the voltage at the output terminal of the response circuit 201 is pulled down by the sixteenth switching transistor M16, which is at a low level. Since the input terminal of the fourth inverter A4 is low, the fourth inverter A4 outputs high, the eighteenth switching transistor M18 is turned off, and the external power supply EVIN is not supplied. The voltage VOUT may be externally output by the second voltage generating circuit 300 at this time.
If the external power supply detection circuit 100 outputs the first control signal with a low level, i.e. the point B is at a low level, the voltage at the output end of the second inverter A2 is converted into a high level, at this time, the third inverter A3 outputs the low level to the control end of the sixteenth switching tube M16, the voltage at the control end of the seventeenth switching tube M17 is at a high level, so that the sixteenth switching tube M16 is turned off and the seventeenth switching tube M17 is turned on; therefore, the voltage of the control terminal of the fourteenth switching tube M14 is pulled down by the seventeenth switching tube M17 which is turned on, the fourteenth switching tube M14 is turned on, at this time, the control terminal of the fifteenth switching tube M15 is pulled up to the output voltage VOUT by the fourteenth switching tube M14, and the voltage of the current input terminal of the fifteenth switching tube M15 is also the output voltage VOUT, so the fifteenth switching tube M15 is turned off, at this time, the voltage of the input terminal of the fourth inverter A4 is pulled up to the output voltage VOUT by the fourteenth switching tube M14, so the fourth inverter A4 outputs a low level, the eighteenth switching tube M18 is turned on, and the external power source EVIN can output the voltage VOUT through the eighteenth switching tube M18. At this time, the output voltage VOUT of the low power consumption power supply of the wide output voltage range is clamped to the external power supply EVIN.
When the external power supply EVIN meets the power supply requirement, the second voltage generating circuit 300 does not work; and, in case that the external power supply EVIN is sufficiently large, the source voltage thereof can be pulled up to EVIN-VD18 through the body diode of the eighteenth switching transistor M18; the source voltage of the eighteenth switching tube M18 is the output voltage VOUT of the first voltage generating circuit 200, and VD18 is the voltage drop of the body diode of the eighteenth switching tube M18.
Further, when the external power supply EVIN is small, the first voltage generation circuit 200 does not operate, and the second voltage generation circuit 300 outputs the voltage VOUT to the outside. In order to ensure that the connected external power supply EVIN does not affect the output voltage VOUT, the maximum value allowed by the external power supply EVIN needs to be smaller than the sum of the voltage VOUT output by the second voltage generating circuit 300 and the body diode drop VD18 of the eighteenth switching transistor M18 when the second voltage generating circuit 300 is operated, i.e. the maximum value of EVIN < the output voltage vout+vd18 at that time.
For example, with the external power supply detection circuit 100 shown in fig. 2, to ensure that the second voltage generation circuit 300 can operate, the external power supply EVIN is smaller thanI.e. EVIN has a maximum value +.>. In addition, the second voltage generation circuit 300 may output a fixed voltage VOUT, for example, the output voltage VOUT of the second voltage generation circuit 300 shown in fig. 5 is +.>(see for details the following description). Therefore, to ensure that the body diode of the eighteenth switching tube M18 is not turned on when the second voltage generating circuit 300 is operated, the two voltage generating circuits need to satisfy:。
in this embodiment, the switch circuit 202 is used as a switch for supplying power by using the external power supply EVIN, and does not need a complex circuit structure, so that the circuit structure can be simplified, and low power consumption can be ensured; also, with the fourteenth, fifteenth, sixteenth, and seventeenth switching transistors M14, M15, M16, and M17, a response to the control signals (including the first and second control signals) can be achieved, so that an appropriate control signal can be output to the switching circuit.
In some alternative embodiments, referring to fig. 5, the second voltage generating circuit 300 includes: the current input terminal of the power supply switching tube M0 is configured to be connected to the power supply VIN, and the current output terminal of the power supply switching tube M0 is used as the output terminal of the second voltage generating circuit 300, which can output the corresponding voltage VOUT.
Also, referring to fig. 5, the second voltage generating circuit 300 further includes: a fourth resistor R4, a fifth resistor R5, a nineteenth switching tube M19, a twentieth switching tube M20, a twenty first switching tube M21, a twenty second switching tube M22, a twenty third switching tube M23, a twenty fourth switching tube M24, a twenty fifth switching tube M25, a twenty sixth switching tube M26, a twenty seventh switching tube M27, and a twenty eighth switching tube M28; the nineteenth switching tube M19, the twentieth switching tube M20, the twenty first switching tube M21 and the twenty second switching tube M22 are PNP type triode or P type field effect tube; the twenty-third switching tube M23, the twenty-fourth switching tube M24, the twenty-fifth switching tube M25, the twenty-seventh switching tube M26, the twenty-seventeenth switching tube M27 and the twenty-eighth switching tube M28 are NPN type triodes or N type field effect tubes.
As shown in fig. 5, one end of the fourth resistor R4 is connected to the current output end of the power supply switching tube M0, and the other end is grounded through the fifth resistor R5.
The current input ends of the nineteenth switching tube M19, the twentieth switching tube M20, the twenty first switching tube M21 and the twenty second switching tube M22 are all configured to be connected to the power supply VIN.
The control end of the nineteenth switching tube M19 and the control end of the twentieth switching tube M20 are connected with the current output end of the twentieth switching tube M20; the current output end of the nineteenth switching tube M19 is connected with the current input end of the twenty third switching tube M23, and the current output end of the twentieth switching tube M20 is connected with the current input end of the twenty fifth switching tube M25.
The control end of the twenty-first switching tube M21 and the control end of the twenty-second switching tube M22 are connected with the current output end of the twenty-first switching tube M21; the current output end of the twenty-first switching tube M21 is connected with the current input end of the twenty-sixth switching tube M26, and the current output end of the twenty-second switching tube M22 is connected with the current input end of the twenty-fourth switching tube M24 and is connected with the control end of the power supply switching tube M0; in fig. 5, the control terminal of the power supply switching tube M0 is denoted by the point E to control the on/off of the power supply switching tube M0.
The control end of the twenty-third switching tube M23 and the control end of the twenty-fourth switching tube M24 are connected with the current input end of the twenty-third switching tube M23; the current output end of the twenty-third switching tube M23 and the current output end of the twenty-fourth switching tube M24 are connected with the current input end of the twenty-seventh switching tube M27.
The control end of the twenty-fifth switching tube M25 is configured to be connected to the second reference voltage VREF2, and the control end of the twenty-sixth switching tube M26 is connected to one end of the fourth resistor R4 near the fifth resistor R5, i.e. to the point D in fig. 5;the current output end of the twenty-fifth switching tube M25 and the current output end of the twenty-sixth switching tube M26 are connected with the current input end of the twenty-eighth switching tube M28. It can be appreciated that the D-point voltage isThe method comprises the steps of carrying out a first treatment on the surface of the Wherein R is 4 Is the resistance value of the fourth resistor R4, R 5 The resistance of the fifth resistor R5. The twenty-fifth switching tube M25 and the twenty-sixth switching tube M26 have the same parameters, for example, the same width-to-length ratio.
The control end of the twenty-seventh switching tube M27 and the control end of the twenty-eighth switching tube M28 are connected with the output end of the external power supply detection circuit 100; for example, point B of the external power supply detection circuit 100 shown in fig. 2 may be connected. The current output end of the twenty-seventh switching tube M27 and the current output end of the twenty-eighth switching tube M28 are grounded.
In this embodiment, the first control signal is low, and the second control signal is high. The second voltage generation circuit 300 shown in fig. 5 operates in the following manner in conjunction with the external power supply detection circuit 100 shown in fig. 2.
When the external power supply EVIN is not connected or is smaller, the point B of the output terminal of the external power supply detection circuit 100 is at a high level, and outputs a second control signal at a high level. Because the point B is in a high level, the voltage of the control ends of the twenty-seventh switching tube M27 and the twenty-eighth switching tube M28 is pulled up, and the twenty-seventh switching tube M27 and the twenty-eighth switching tube M28 are conducted; meanwhile, after the power supply VIN is connected to the low-power consumption power supply with the wide output voltage range, the second reference voltage VREF2 may be input to the control end of the twenty-fifth switching tube M25, and the twenty-fifth switching tube M25 is turned on, and at this time, the voltages at the control ends of the nineteenth switching tube M19 and the twenty-eighth switching tube M20 are pulled down through the twenty-fifth switching tube M25 and the twenty-eighth switching tube M28, the nineteenth switching tube M19 and the twenty-eighth switching tube M20 are turned on, and the voltages at the control ends of the twenty-third switching tube M23 and the twenty-fourth switching tube M24 are pulled up through the nineteenth switching tube M19, the twenty-third switching tube M23 and the twenty-fourth switching tube M24 are turned on, so that at this time, currents are generated in the branches formed by the twenty-ninth switching tube M20, the twenty-fifth switching tube M25 and the twenty-eighth switching tube M28, and the nineteenth switching tube M19 form a current mirror structure, and thus currents also flow in the branches formed by the nineteenth switching tube M19, the twenty-third switching tube M23 and the twenty-seventeenth switching tube M27. Because the twenty-third switching tube M23 and the twenty-fourth switching tube M24 form a current mirror structure, a pull-down current of the E point is generated in the twenty-fourth switching tube M24, the voltage of the E point is pulled down, and the E point is in a low level, so that the power supply switching tube M0 is conducted. At this time, a current is generated in a branch circuit formed by the power supply switching tube M0, the fourth resistor R4 and the fifth resistor R5, the voltage at the point D rises, the voltage at the control end of the twenty-sixth switching tube M26 is pulled high, and the twenty-sixth switching tube M26 is conducted; at this time, the control terminal voltages of the twenty-first switching tube M21 and the twenty-second switching tube M22 are pulled down by the twenty-sixth switching tube M26 and the twenty-eighth switching tube M28, and the twenty-first switching tube M21 and the twenty-second switching tube M22 are turned on, so that a current is also generated in the branch circuit constituted by the twenty-first switching tube M21, the twenty-sixth switching tube M26 and the twenty-eighth switching tube M28, and at this time, since the twenty-first switching tube M21 and the twenty-second switching tube M22 constitute a current mirror structure, a charging current of the point E is generated in the twenty-second switching tube M22, and the current can be pulled up by the point E voltage.
The current flowing through the twenty-fifth switching transistor M25 is the fourth current I4, the current flowing through the twenty-third switching transistor M26 is the fifth current I5, the twenty-first switching transistor M21 and the twenty-second switching transistor M22 are assumed to have the same width-to-length ratio, the twenty-third switching transistor M23 and the twenty-fourth switching transistor M24 are assumed to have the same width-to-length ratio, the fourth current i4=the current flowing through the nineteenth switching transistor M25=the current flowing through the twenty-third switching transistor M23=the current flowing through the twenty-fourth switching transistor M24=the pull-down current at the point E, and the fifth current i5=the current flowing through the twenty-sixth switching transistor M26=the current flowing through the twenty-first switching transistor M21=the current flowing through the twenty-second switching transistor M22=the charging current at the point E, as is known from the configuration of fig. 5.
If the current flowing through the fifth resistor R5 is smaller, the voltage at the point D is lower and is lower than the second reference voltage VREF2, since the twenty-fifth switching transistor M25 is connected to the current output terminal of the twenty-sixth switching transistor M26, the voltage difference between the control terminal and the current output terminal of the twenty-fifth switching transistor M25 is greater than the voltage difference between the control terminal and the current output terminal of the twenty-sixth switching transistor M26, and therefore the fourth current I4 flowing through the twenty-fifth switching transistor M25 is greater than the fifth current I5 flowing through the twenty-sixth switching transistor M26, i.e., the pull-down current at the point E is greater than the charging current at the point E, the point E is still at the low level, the power supply switching transistor M0 remains on, and the current flowing through the fifth resistor R5 continuously increases.
When the current flowing through the fifth resistor R5 increases to a certain value so that the point D voltage is higher than the second reference voltage VREF2, the voltage difference between the control terminal and the current output terminal of the twenty-fifth switching transistor M25 is smaller than the voltage difference between the control terminal and the current output terminal of the twenty-sixth switching transistor M26, and thus, the fourth current I4 flowing through the twenty-fifth switching transistor M25 is smaller than the fifth current I5 flowing through the twenty-sixteen switching transistor M26, that is, the pull-down current at the point E is smaller than the charging current at the point E, the point E is converted to a high level, the power switching transistor M0 is turned off, the current flowing through the fifth resistor R5 is reduced, the point D voltage is reduced to be lower than the second reference voltage VREF2, and then the cycle is repeated.
Therefore, when the second voltage generating circuit 300 is in a stable state, the D-point voltage is equal to the second reference voltage VREF2, i.eThe method comprises the steps of carrying out a first treatment on the surface of the Therefore, at this time, the output voltage VOUT of the low power consumption power supply with a wide output voltage range is a constant voltage +.>。
Conversely, if the external power supply EVIN meets the power supply requirement, for example, the external power supply EVIN is large enough, the point B at the output end of the external power supply detection circuit 100 is low, and it outputs the first control signal of low level. Since the point B is at a low level, the voltages at the control terminals of the twenty-seventh switching transistor M27 and the twenty-eighth switching transistor M28 are both at a low level, and the twenty-seventh switching transistor M27 and the twenty-eighth switching transistor M28 are turned off, so that the entire second voltage generating circuit 300 does not operate.
In this embodiment, the main power consumption device of the second voltage generating circuit 300 is the power supply switching tube M0, and the other devices (for example, the nineteenth switching tube M19 to the twenty-eighth switching tube M28) mainly play a role in control, so that the power consumption is low. The second voltage generating circuit 300 is adapted to output a voltage VOUT relatively close to the power supply VIN, and at this time, since the voltage difference between the power supply VIN and the voltage VOUT is small, the operating current flowing through the power supply switching transistor M0 is small, and therefore the power consumption of the second voltage generating circuit 300 is low, and it is possible to ensure that the power consumption of the entire power supply is also low.
Further, whether to switch in the external power supply EVIN or the magnitude of the switched-in external power supply EVIN may be determined based on the magnitude of the power supply VIN and the magnitude of the required output voltage VOUT.
Specifically, if the voltage of the power supply VIN is small, the power supply VIN and the fixed voltageThe difference between them is small and the output fixed voltage +.>Can meet the current application scene of the chip, and can directly output fixed voltage by using the low-power consumption power supply with the wide output voltage rangeAt this time, due to the power supply VIN and the fixed voltage +.>The difference is smaller, so that the working current in the power supply switching tube M0 in the second voltage generating circuit 300 is smaller, and the power consumption of the second voltage generating circuit 300 is lower, thereby ensuring that the power consumption of the whole power supply is also lower.
If the voltage of the power supply VIN is large, this will result in the power supply VIN and a fixed voltageThe difference between them is large, resulting inThe second voltage generating circuit 300 consumes more power, or if a fixed voltage is outputted +>The current application scenario of the chip cannot be satisfied, an external power supply EVIN can be connected to the low-power supply with the wide output voltage range, and in order to prevent the false triggering of the first voltage generating circuit 200, when the external power supply EVIN is greater than +.>When the second voltage generating circuit 300 is turned off, the first voltage generating circuit 200 can clamp the output voltage VOUT of the low power consumption power supply with a wide output voltage range to the external power supply EVIN, and at this time, since the output voltage VOUT is directly clamped to the external power supply EVIN, the power loss of the low power consumption power supply with a wide output voltage range can be greatly reduced.
At this time, the external power supply EVIN is greater thanThe method comprises the steps of carrying out a first treatment on the surface of the In order to prevent the body diode of the power supply switch tube M0 from conducting, and affect the reliability of the circuit, the external power supply EVIN needs to be smaller than vin+vd0, where VD0 is the forward conducting voltage of the body diode of the power supply switch tube M0. Therefore, the external power supply EVIN may be greater than +.>And is smaller than any value of vin+vd0, a wide range of voltage outputs can be achieved.
Optionally, referring to fig. 6, the second voltage generating circuit 300 further includes: a zener diode Z1 and a sixth resistor R6; the zener diode Z1 is connected in series with the sixth resistor R6 and is arranged between the current input of the nineteenth switching tube M19 and the current output of the twenty third switching tube M23. The zener diode Z1 and the sixth resistor R6 can ensure that the voltage across the nineteenth switching tube M19 to the twenty-fourth switching tube M24 is not over-voltage.
Optionally, as shown in fig. 6, the second voltage generating circuit 300 may further include: a twenty-ninth switching tube M29 and a thirty-ninth switching tube M30; the twenty-ninth switching tube M29 and the thirty-ninth switching tube M30 are NPN type triodes or N type field effect tubes.
The control terminal of the twenty-ninth switching transistor M29 and the control terminal of the thirty-eighth switching transistor M30 are both connected to the external power supply detection circuit 100, and when the external power supply detection circuit 100 is connected to the control power supply VDD, the control terminal of the twenty-ninth switching transistor M29 and the control terminal of the thirty-eighth switching transistor M30 are at a high level.
The current input end of the twenty-ninth switching tube M29 is connected with the current output end of the twenty-seventh switching tube M27, and the current output end of the twenty-ninth switching tube M29 is grounded; the current input end of the thirty-eighth switching tube M30 is connected with the current output end of the twenty-eighth switching tube M28, and the current output end of the thirty-eighth switching tube M30 is grounded.
In this embodiment, when the external power supply detection circuit 100 is connected to the control power supply VDD, the control terminal of the twenty-ninth switching transistor M29 and the control terminal of the thirty-ninth switching transistor M30 are both at high level. For example, referring to fig. 3, the gate of the first switching tube M1 is taken as the point F, and the control end of the twenty-ninth switching tube M29 and the control end of the thirty-ninth switching tube M30 can be connected to the point F; one circuit configuration of the low power consumption power supply of the wide output voltage range can be seen in fig. 7, in which the external power supply detection circuit 100, the first voltage generation circuit 200, and the second voltage generation circuit 300 can be grounded in common.
When the external power supply detection circuit 100 is connected to the control power supply VDD, the voltage of the control terminal of the twenty-ninth switching tube M29 and the voltage of the control terminal of the thirty-ninth switching tube M30 can be raised by using the current I1 generated by the current source B1, so that the twenty-ninth switching tube M29 and the thirty-eighth switching tube M30 are turned on, and the second voltage generating circuit 300 can work normally when the twenty-seventh switching tube M27 and the twenty-eighth switching tube M28 are turned on.
Wherein the twenty-ninth switching tube M29 and the thirty-ninth switching tube M30 generate constant mirror currents according to the current source B1; the mirror current may cause the control current flowing in the second voltage generating circuit 300 to be in a controllable state, thereby ensuring that the power consumption of the second voltage generating circuit 300 is controllable. In the second voltage generating circuit 300, the other switching transistors of the branch circuit where the twenty-ninth switching transistor M29 and the thirty-ninth switching transistor M30 are located all operate in the linear resistor region (e.g., the twenty-seventh switching transistor M27, the twenty-eighth switching transistor M28, etc.), that is, the drain-source voltage difference (Vds) of the other switching transistors is small, and since the voltages at the two ends of the sixth resistor R6 and the zener diode Z1 are clamped, when the power supply VIN changes, the circuit can be ensured to operate reliably by changing the drain-source voltage difference of the twenty-ninth switching transistor M29 and the thirty-ninth switching transistor M30 along with the change of the power supply VIN.
The embodiment of the invention also provides a semiconductor integrated circuit control chip which comprises any low-power consumption power supply with wide output voltage range provided by the embodiment. The low power consumption power supply using the wide output voltage range can supply a desired voltage to the chip internal module.
The embodiment of the invention also provides a switching power supply circuit which comprises the semiconductor integrated circuit control chip. The switching power supply circuit may be applied in a variety of scenarios, for example, the switching power supply circuit may be used for battery charging.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.

Claims (10)

1. A low power consumption power supply of a wide output voltage range, comprising: an external power supply detection circuit (100), a first voltage generation circuit (200), and a second voltage generation circuit (300);
the external power supply detection circuit (100) is powered by a control power supply; the output end of the external power supply detection circuit (100) is connected with the input ends of the first voltage generation circuit (200) and the second voltage generation circuit (300);
The external power supply detection circuit (100) is configured to detect whether an external power supply meets a power supply requirement; under the condition that the external power supply meets the power supply requirement, the output end of the external power supply detection circuit (100) outputs a first control signal; under the condition that the external power supply does not meet the power supply requirement, the output end of the external power supply detection circuit (100) outputs a second control signal;
the first voltage generation circuit (200) is configured to: outputting a voltage corresponding to the external power source in response to the first control signal;
the second voltage generation circuit (300) is configured to: and responding to the second control signal, converting the input power supply and outputting the converted voltage.
2. The low power consumption power supply according to claim 1, wherein the external power supply detection circuit (100) includes: the switching device comprises a current source B1, a first switching tube M1, a second switching tube M2, a third switching tube M3, a fourth switching tube M4, a fifth switching tube M5, a sixth switching tube M6, a seventh switching tube M7, an eighth switching tube M8, a ninth switching tube M9, a tenth switching tube M10, a first resistor R1, a second resistor R2 and a first inverter A1; the first switching tube M1, the second switching tube M2, the seventh switching tube M7, the eighth switching tube M8, the ninth switching tube M9, and the tenth switching tube M10 are NPN transistors or N-type field effect transistors; the third switching tube M3, the fourth switching tube M4, the fifth switching tube M5 and the sixth switching tube M6 are PNP type triode or P type field effect tube;
The input end of the current source B1 is configured to be connected with the control power supply, and the output end of the current source B1 is connected with the current input end of the first switching tube M1;
the control end of the first switching tube M1 and the control end of the second switching tube M2 are connected with the current input end of the first switching tube M1; the current output end of the first switching tube M1 and the current output end of the second switching tube M2 are grounded;
one end of the first resistor R1 is configured to be connected to the external power supply, and the other end of the first resistor R1 is grounded through the second resistor R2;
the current input ends of the third switching tube M3, the fourth switching tube M4, the fifth switching tube M5 and the sixth switching tube M6 are all configured to be connected with the control power supply;
the control end of the third switching tube M3 and the control end of the fourth switching tube M4 are connected with the current output end of the fourth switching tube M4; the current output end of the third switching tube M3 is connected with the current input end of the ninth switching tube M9, and the current output end of the fourth switching tube M4 is connected with the current input end of the seventh switching tube M7;
the control end of the fifth switching tube M5 and the control end of the sixth switching tube M6 are connected with the current output end of the fifth switching tube M5; the current output end of the fifth switching tube M5 is connected with the current input end of the eighth switching tube M8, and the current output end of the sixth switching tube M6 is connected with the current input end of the tenth switching tube M10 and is connected with the input end of the first inverter A1; the output end of the first inverter A1 is used as the output end of the external power supply detection circuit (100);
The control end of the seventh switching tube M7 is configured to be connected with a first reference voltage, and the control end of the eighth switching tube M8 is connected with one end of the first resistor R1, which is close to the second resistor R2; the current output end of the seventh switching tube M7 and the current output end of the eighth switching tube M8 are connected with the current input end of the second switching tube M2;
the control end of the ninth switching tube M9 and the control end of the tenth switching tube M10 are connected with the current input end of the ninth switching tube M9; the current output end of the ninth switching tube M9 and the current output end of the tenth switching tube M10 are grounded.
3. The low power consumption power supply according to claim 2, wherein the external power supply detection circuit (100) further comprises: a first hysteresis circuit (101) and a second hysteresis circuit (102); the first hysteresis circuit (101) comprises: a third resistor R3 and an eleventh switching tube M11; the eleventh switch tube M11 is an NPN triode or an N field effect tube;
one end of the third resistor R3 is connected with one end of the second resistor R2 far away from the first resistor R1, and the other end of the third resistor R3 is grounded;
the control end of the eleventh switching tube M11 is connected with the output end of the first phase inverter A1; the current input end of the eleventh switching tube M11 is connected with one end of the third resistor R3, which is close to the second resistor R2, and the current output end of the eleventh switching tube M11 is grounded;
The second hysteresis circuit (102) is configured to provide a charging current to the current input of the tenth switching tube M10 in case the output of the first inverter A1 is low.
4. A low power consumption power supply according to claim 3, characterized in that the second hysteresis circuit (102) comprises: a twelfth switching tube M12 and a thirteenth switching tube M13; the twelfth switching tube M12 and the thirteenth switching tube M13 are PNP type triode or P type field effect tube;
the control end of the twelfth switching tube M12 is connected with the control end of the fifth switching tube M5, the current input end of the twelfth switching tube M12 is configured to be connected with the control power supply, and the current output end of the twelfth switching tube M12 is connected with the current input end of the thirteenth switching tube M13;
the control end of the thirteenth switching tube M13 is connected to the output end of the first inverter A1, and the current output end of the thirteenth switching tube M13 is connected to the current input end of the tenth switching tube M10.
5. The low power consumption power supply according to claim 1, wherein the first voltage generation circuit (200) includes: a response circuit (201) and a switching circuit (202);
The input end of the response circuit (201) is connected with the output end of the external power supply detection circuit (100), and the output end of the response circuit (201) is connected with the control end of the switch circuit (202); the response circuit (201) is configured to convert the first control signal into a third control signal and the second control signal into a fourth control signal;
an input of the switching circuit (202) is configured to be connected to the external power supply, and an output of the switching circuit (202) serves as an output of the first voltage generating circuit (200); the switch circuit (202) is configured to be turned on by the input end and the output end of the switch circuit (202) when the third control signal is input to the control end of the switch circuit (202); when the control end of the switch circuit (202) inputs the fourth control signal, the input end and the output end of the switch circuit (202) are turned off.
6. The low power consumption power supply according to claim 5, wherein the response circuit (201) comprises: a second inverter A2, a third inverter A3, a fourteenth switching tube M14, a fifteenth switching tube M15, a sixteenth switching tube M16, and a seventeenth switching tube M17; the fourteenth switching tube M14 and the fifteenth switching tube M15 are PNP type triodes or P type field effect tubes, and the sixteenth switching tube M16 and the seventeenth switching tube M17 are NPN type triodes or N type field effect tubes;
The input end of the second inverter A2 is connected with the output end of the external power supply detection circuit (100), and the output end of the second inverter A2 is connected with the input end of the third inverter A3;
the current input ends of the fourteenth switching tube M14 and the fifteenth switching tube M15 are connected with the output end of the first voltage generating circuit (200); the control end of the fourteenth switching tube M14 is connected with the current output end of the fifteenth switching tube M15, and the control end of the fifteenth switching tube M15 is connected with the current output end of the fourteenth switching tube M14;
the control end of the sixteenth switching tube M16 is connected with the output end of the third inverter A3, the current input end of the sixteenth switching tube M16 is connected with the current output end of the fourteenth switching tube M14, and the current output end of the sixteenth switching tube M16 is grounded; the current output end of the fourteenth switching tube M14 is also connected with the control end of the switching circuit (202);
the control end of the seventeenth switching tube M17 is connected with the output end of the second inverter A2, the current input end of the seventeenth switching tube M17 is connected with the current output end of the fifteenth switching tube M15, and the current output end of the seventeenth switching tube M17 is grounded;
And/or, the switching circuit (202) comprises: a fourth inverter A4 and an eighteenth switching transistor M18; the eighteenth switching tube M18 is a P-type field effect tube;
the input end of the fourth inverter A4 is connected with the output end of the response circuit (201), and the output end of the fourth inverter A4 is connected with the control end of the eighteenth switching tube M18;
the drain electrode of the eighteenth switching tube M18 is configured to be connected to the external power supply, and the source electrode of the eighteenth switching tube M18 is used as the output end of the first voltage generating circuit (200).
7. The low power consumption power supply according to claim 1, wherein the second voltage generation circuit (300) includes: a power supply switching tube M0, a fourth resistor R4, a fifth resistor R5, a nineteenth switching tube M19, a twentieth switching tube M20, a twenty first switching tube M21, a twenty second switching tube M22, a twenty third switching tube M23, a twenty fourth switching tube M24, a twenty fifth switching tube M25, a twenty sixth switching tube M26, a twenty seventh switching tube M27 and a twenty eighth switching tube M28; the nineteenth switching tube M19, the twentieth switching tube M20, the twenty first switching tube M21 and the twenty second switching tube M22 are PNP transistors or P-type field effect transistors; the twenty-third switching tube M23, the twenty-fourth switching tube M24, the twenty-fifth switching tube M25, the twenty-sixteen switching tube M26, the twenty-seventeenth switching tube M27, and the twenty-eighth switching tube M28 are NPN transistors or N-type field effect transistors;
The current input end of the power supply switch tube M0 is configured to be connected to the power supply, and the current output end of the power supply switch tube M0 serves as the output end of the second voltage generation circuit (300);
one end of the fourth resistor R4 is connected with the current output end of the power supply switching tube M0, and the other end of the fourth resistor R4 is grounded through the fifth resistor R5;
the current input ends of the nineteenth switching tube M19, the twentieth switching tube M20, the twenty first switching tube M21 and the twenty second switching tube M22 are all configured to be connected with the power supply;
the control end of the nineteenth switching tube M19 and the control end of the twentieth switching tube M20 are connected with the current output end of the twentieth switching tube M20; the current output end of the nineteenth switching tube M19 is connected to the current input end of the twenty third switching tube M23, and the current output end of the twentieth switching tube M20 is connected to the current input end of the twenty fifth switching tube M25;
the control end of the twenty-first switching tube M21 and the control end of the twenty-second switching tube M22 are connected with the current output end of the twenty-first switching tube M21; the current output end of the twenty-first switching tube M21 is connected with the current input end of the twenty-sixth switching tube M26, and the current output end of the twenty-second switching tube M22 is connected with the current input end of the twenty-fourth switching tube M24 and the control end of the power supply switching tube M0;
The control end of the twenty-third switching tube M23 and the control end of the twenty-fourth switching tube M24 are connected with the current input end of the twenty-third switching tube M23; the current output end of the twenty-third switching tube M23 and the current output end of the twenty-fourth switching tube M24 are connected with the current input end of the twenty-seventh switching tube M27;
the control end of the twenty-fifth switching tube M25 is configured to be connected to a second reference voltage, and the control end of the twenty-sixth switching tube M26 is connected to one end of the fourth resistor R4 close to the fifth resistor R5; the current output end of the twenty-fifth switching tube M25 and the current output end of the twenty-eighth switching tube M26 are connected with the current input end of the twenty-eighth switching tube M28;
the control end of the twenty-seventh switching tube M27 and the control end of the twenty-eighth switching tube M28 are connected with the output end of the external power supply detection circuit (100); the current output end of the twenty-seventh switching tube M27 and the current output end of the twenty-eighth switching tube M28 are grounded.
8. The low power consumption power supply according to claim 7, wherein the second voltage generation circuit (300) further comprises: a zener diode Z1 and a sixth resistor R6; the zener diode Z1 and the sixth resistor R6 are connected in series, and are disposed between the current input end of the nineteenth switching tube M19 and the current output end of the twenty third switching tube M23;
And/or, the second voltage generation circuit (300) further comprises: a twenty-ninth switching tube M29 and a thirty-ninth switching tube M30; the twenty-ninth switching tube M29 and the thirty-ninth switching tube M30 are NPN type triodes or N type field effect tubes;
the control end of the twenty-ninth switching tube M29 and the control end of the thirty-ninth switching tube M30 are connected with the external power supply detection circuit (100), and the control end of the twenty-ninth switching tube M29 and the control end of the thirty-eighth switching tube M30 are in high level under the condition that the external power supply detection circuit (100) is connected with the control power supply;
the current input end of the twenty-ninth switching tube M29 is connected with the current output end of the twenty-seventh switching tube M27, and the current output end of the twenty-ninth switching tube M29 is grounded;
the current input end of the thirty-eighth switching tube M30 is connected with the current output end of the twenty-eighth switching tube M28, and the current output end of the thirty-eighth switching tube M30 is grounded.
9. A semiconductor integrated circuit control chip comprising the low power consumption power supply of the wide output voltage range according to any one of claims 1 to 8.
10. A switching power supply circuit comprising the semiconductor integrated circuit control chip according to claim 9.
CN202410167068.2A 2024-02-06 2024-02-06 Low-power consumption power supply with wide output voltage range Active CN117713506B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410167068.2A CN117713506B (en) 2024-02-06 2024-02-06 Low-power consumption power supply with wide output voltage range

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410167068.2A CN117713506B (en) 2024-02-06 2024-02-06 Low-power consumption power supply with wide output voltage range

Publications (2)

Publication Number Publication Date
CN117713506A true CN117713506A (en) 2024-03-15
CN117713506B CN117713506B (en) 2024-04-19

Family

ID=90157483

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202410167068.2A Active CN117713506B (en) 2024-02-06 2024-02-06 Low-power consumption power supply with wide output voltage range

Country Status (1)

Country Link
CN (1) CN117713506B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104919689A (en) * 2014-01-10 2015-09-16 雅达电子国际有限公司 CONTROL CIRCUITs AND METHODs FOR REGULATING OUTPUT VOLTAGES BASED ON ADJUSTABLE REFERENCES VOLTAGES
CN111313729A (en) * 2019-12-16 2020-06-19 成都芯源系统有限公司 Power converter and power supply method thereof
CN115313344A (en) * 2022-08-29 2022-11-08 深圳市国微电子有限公司 Protection circuit, management chip and power supply unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104919689A (en) * 2014-01-10 2015-09-16 雅达电子国际有限公司 CONTROL CIRCUITs AND METHODs FOR REGULATING OUTPUT VOLTAGES BASED ON ADJUSTABLE REFERENCES VOLTAGES
CN111313729A (en) * 2019-12-16 2020-06-19 成都芯源系统有限公司 Power converter and power supply method thereof
CN115313344A (en) * 2022-08-29 2022-11-08 深圳市国微电子有限公司 Protection circuit, management chip and power supply unit

Also Published As

Publication number Publication date
CN117713506B (en) 2024-04-19

Similar Documents

Publication Publication Date Title
CN1848019B (en) Constant voltage power supply circuit and method of testing the same
US9136827B2 (en) Power-on reset circuit
CN101304169A (en) Irregular voltage detection and cutoff circuit using bandgap reference voltage generation circuit
KR20000035735A (en) Starting circuit for integrated circuit device
JP2011039887A (en) Band gap reference circuit
CN107493097B (en) Power-on self-reset circuit with long reset time
CN110703010A (en) Test circuit
CN117579043B (en) Voltage comparator with hysteresis function
CN117559769B (en) Chip internal voltage generation circuit of external power supply
CN117713506B (en) Low-power consumption power supply with wide output voltage range
CN112217178A (en) Reverse input protection circuit, integrated circuit chip and stabilized voltage power supply
CN111061333B (en) Reference comparison circuit
CN110007127B (en) Voltage detection circuit
KR100930500B1 (en) Bandgap Reference Circuit Using Comparator
CN113783160B (en) Undervoltage protection circuit and power module
CN113381732B (en) Low-power-consumption relaxation oscillator controlled by double comparators and working method
CN107959476A (en) Low power consumption current hunger type pierce circuit
KR100709856B1 (en) Current limit circuit of low drop out regulator
CN109213253B (en) Quick high-precision low-temperature-drift strong pull-down current generation circuit
CN117471152B (en) Low-power-consumption voltage detection circuit
CN207896939U (en) Low power consumption current hunger type pierce circuit
CN112489711A (en) Circuit for relieving insufficient driving capability at moment of chip active mode starting
CN117492509B (en) Low-voltage comparison circuit
JP2002323519A (en) Voltage monitoring circuit
CN100549897C (en) Current-source arrangement

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant