CN115377939B - Adjustable undervoltage protection circuit and electronic equipment - Google Patents
Adjustable undervoltage protection circuit and electronic equipment Download PDFInfo
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- CN115377939B CN115377939B CN202210843842.8A CN202210843842A CN115377939B CN 115377939 B CN115377939 B CN 115377939B CN 202210843842 A CN202210843842 A CN 202210843842A CN 115377939 B CN115377939 B CN 115377939B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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Abstract
The invention relates to an adjustable under-voltage protection circuit and electronic equipment, wherein the circuit comprises a voltage adjusting circuit, a reference voltage circuit, a comparison circuit and a hysteresis feedback circuit; the reference voltage circuit generates a reference voltage; the voltage regulating circuit generates a divided voltage; the comparison circuit is used for comparing, when the divided voltage is larger than the reference voltage, a low-voltage logic signal is generated, and when the divided voltage is smaller than the reference voltage, a high-voltage logic signal is generated; the hysteresis feedback circuit controls the corresponding controllable switch tube to be conducted based on the low-voltage logic signal, and at the moment, the hysteresis feedback circuit is connected in series with a hysteresis resistor which generates voltage drop; the hysteresis feedback circuit turns off the controllable switching tube based on the high voltage logic signal. The power supply voltage can be judged in real time when the integrated circuit is used, and when the power supply voltage is insufficient, the working state of the control chip can be controlled through the hysteresis feedback circuit, so that the undervoltage protection mode is entered, and the circuit is prevented from being failed and cannot be recovered.
Description
Technical Field
The invention belongs to the technical field of electronic equipment, and particularly relates to an adjustable under-voltage protection circuit and electronic equipment.
Background
The integrated circuit (chip) may suffer from insufficient power supply during use, and the insufficient power supply may cause the partial circuit of the chip to be turned on or the timing sequence to be disordered, so that an under-voltage protection circuit is required. When the output voltage is lower than the set threshold, an indication signal is output to indicate that the chip is in an undervoltage state and needs to enter an undervoltage protection mode.
In the related art, the existing integrated circuit chip has the problem that the functional disorder is caused by the fact that the integrated circuit chip is still started when the power supply voltage is insufficient, and even cannot be recovered.
Disclosure of Invention
Therefore, the invention aims to overcome the defects of the prior art, and provides an adjustable under-voltage protection circuit and electronic equipment, so as to solve the problems that the integrated circuit chip is still started when the power supply voltage is insufficient, and the function disorder is caused and even the recovery cannot be realized in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme: an adjustable under-voltage protection circuit, comprising: the voltage regulation circuit, the reference voltage circuit, the comparison circuit and the hysteresis feedback circuit;
the reference voltage circuit is used for generating a reference voltage;
the voltage regulating circuit is used for carrying out voltage division on the power supply voltage to generate divided voltage;
one input end of the comparison circuit receives the reference voltage, the other input end of the comparison circuit receives the divided voltage, the comparison circuit is used for comparing the reference voltage with the divided voltage, when the divided voltage is larger than the reference voltage, a low-voltage logic signal is generated, and when the divided voltage is smaller than the reference voltage, a high-voltage logic signal is generated;
the hysteresis feedback circuit is used for controlling the conduction of a corresponding eighth N-type controllable switch tube based on the low-voltage logic signal, and is connected in series with a hysteresis resistor at the moment, and the hysteresis resistor generates voltage drop to reduce the reference voltage; the hysteresis feedback circuit turns off the eighth N-type controllable switching transistor based on the high voltage logic signal.
Further, the voltage regulating circuit includes: the first resistor and the second resistor are connected in series.
Further, the comparison circuit includes a comparator.
Further, the comparator includes: the input end of the first current mirror is connected with the folding amplifier, and the output end of the first current mirror is connected with the folding amplifier;
the first current mirror is used for receiving a first current and generating a second current which is in a preset proportion with the first current according to the first current, and the second current is used for providing electric energy for the folding amplifier;
the folded amplifier is used for comparing a reference voltage and a divided voltage.
Further, the folded amplifier includes:
the first N-type controllable switch tube, the second N-type controllable switch tube, the third N-type controllable switch tube, the fourth N-type controllable switch tube, the second current mirror, the fifth P-type controllable switch tube and the sixth P-type controllable switch tube;
the source electrode of the fifth P-type controllable switch tube and the source electrode of the sixth P-type controllable switch tube are commonly connected with the output end of the first current mirror, the grid electrode of the fifth P-type controllable switch tube is commonly connected with one end of the first resistor and one end of the second resistor, the drain electrode of the fifth P-type controllable switch tube is commonly connected with the grid electrode and the drain electrode of the first N-type controllable switch tube, the grid electrode of the first N-type controllable switch tube is also connected with the grid electrode of the third N-type controllable switch tube, the drain electrode of the third N-type controllable switch tube is connected with one end of the second current mirror, the drain electrode of the sixth P-type controllable switch tube is commonly connected with the grid electrode and the drain electrode of the second N-type controllable switch tube, the grid electrode of the second N-type controllable switch tube is also connected with the grid electrode of the fourth N-type controllable switch tube, and the drain electrode of the fourth N-type controllable switch tube is also connected with the other end of the second current mirror;
the source electrode of the first N-type controllable switch tube, the source electrode of the second N-type controllable switch tube, the source electrode of the third N-type controllable switch tube, the source electrode of the fourth N-type controllable switch tube, the source electrodes of the fifth P-type controllable switch tube and the sixth P-type controllable switch tube are all grounded.
Further, the hysteresis feedback circuit includes: the device comprises an inverter, a third current mirror, an eighth N-type controllable switch tube and a hysteresis resistor;
the input end of the inverter is connected with the output end of the folding amplifier, and the output end of the inverter is connected with the grid electrode of the eighth N-type controllable switch tube; one end of the hysteresis resistor is commonly connected with the drain electrodes of the folding amplifier and the eighth N-type controllable switch tube, and the other end of the hysteresis resistor is connected with a reference voltage circuit; and the source electrode of the eighth N-type controllable switch tube is connected with one end of a third current mirror, and the other end of the third current mirror is grounded.
Further, the inverter includes: a seventh P-type controllable switch tube and a fifth N-type controllable switch tube;
the grid electrode of the seventh P-type controllable switch tube, the grid electrode of the fifth N-type controllable switch tube, the output end of the second current mirror and the drain electrode of the fourth N-type controllable switch tube are connected together, the source electrode of the seventh P-type controllable switch tube is connected with the power supply voltage, the drain electrode of the seventh P-type controllable switch tube is connected with the drain electrode of the fifth N-type controllable switch tube and the grid electrode of the eighth N-type controllable switch tube together, and the source electrode of the fifth N-type controllable switch tube is connected.
Further, the first current mirror includes: the first P-type controllable switch tube and the second P-type controllable switch tube;
the second current mirror includes: the third P-type controllable switch tube and the fourth P-type controllable switch tube;
the third current mirror includes: a sixth N-type controllable switch tube and a seventh N-type controllable switch tube.
The embodiment of the application provides an electronic device, and the adjustable undervoltage protection circuit provided by any embodiment is applied.
By adopting the technical scheme, the invention has the following beneficial effects:
according to the method, the voltage regulating circuit, the reference voltage circuit, the comparison circuit and the hysteresis feedback circuit are arranged, the comparison circuit compares the reference voltage with the divided voltage, when the divided voltage is larger than the reference voltage, a low-voltage logic signal is generated, when the divided voltage is smaller than the reference voltage, a high-voltage logic signal is generated, the hysteresis feedback circuit controls the corresponding eighth N-type controllable switch tube to be conducted based on the low-voltage logic signal, at the moment, the hysteresis feedback circuit is connected in series with the hysteresis resistor, the hysteresis resistor generates voltage drop, and the reference voltage is reduced; the hysteresis feedback circuit turns off the eighth N-type controllable switching transistor based on the high voltage logic signal. The power supply voltage can be judged in real time when the integrated circuit is used, and when the power supply voltage is insufficient, the working state of the control chip can be controlled through the hysteresis feedback circuit, so that the undervoltage protection mode is entered, and the circuit is prevented from being failed and cannot be recovered.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an adjustable undervoltage protection circuit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
A specific adjustable undervoltage protection circuit and an electronic device provided in embodiments of the present application are described below with reference to the accompanying drawings.
As shown in fig. 1, the adjustable under-voltage protection circuit provided in the embodiment of the present application includes a voltage adjustment circuit 1, a reference voltage circuit 2, a comparison circuit 3, and a hysteresis feedback circuit 4;
the reference voltage circuit 2 is used for generating a reference voltage;
the voltage regulating circuit 1 is used for carrying out voltage division processing on the power supply voltage to generate a divided voltage;
one input end of the comparison circuit 3 receives the reference voltage, the other input end of the comparison circuit 3 receives the divided voltage, the comparison circuit 3 is used for comparing the reference voltage with the divided voltage, when the divided voltage is larger than the reference voltage, a low-voltage logic signal is generated, and when the divided voltage is smaller than the reference voltage, a high-voltage logic signal is generated;
the hysteresis feedback circuit 4 controls the corresponding eighth N-type controllable switch tube NM8 to be conducted based on the low-voltage logic signal, at the moment, the hysteresis feedback circuit 4 is connected in series with a hysteresis resistor R3, the hysteresis resistor R3 generates voltage drop, and the reference voltage is reduced; the hysteresis feedback circuit 4 turns off the eighth N-type controllable switching transistor NM8 based on the high voltage logic signal.
The working principle of the adjustable undervoltage protection circuit is as follows: in the adjustable undervoltage protection circuit shown in fig. 1, VIN is a supply voltage required for undervoltage detection, and the voltage is divided by the voltage adjusting circuit 1 to generate a voltage signal UVLO; VREF in the reference voltage circuit 2 is a reference voltage; the comparison circuit 3 compares UVLO with VREF, if the UVLO voltage is lower than VREF, the circuit is in an undervoltage state, and the undervoltage output signal UVLO_OK is high voltage; if the UVLO voltage is higher than VREF, the circuit is in a normal state and the under-voltage output signal UVLO_OK is low. When the UVLO_OK is low voltage during normal operation of the circuit, the hysteresis feedback circuit 4 is connected in series with the hysteresis resistor R3, the hysteresis resistor R3 generates voltage drop, the reference voltage is reduced, and therefore the purpose of undervoltage hysteresis is achieved; when the circuit works normally, the VIN voltage needs to be reduced to be lower than the undervoltage protection voltage by one hysteresis voltage, and then the circuit is in an undervoltage protection state; when uvlo_ok is high voltage, the hysteresis feedback circuit 4 turns off the eighth N-type controllable switch tube NM8 based on the high voltage logic signal, so as to enter an under-voltage protection mode, and avoid that the circuit fails and cannot recover.
In some embodiments, the voltage regulating circuit 1 comprises: the first resistor R1 and the second resistor R2 are connected in series, and the first resistor R1 and the second resistor R2 are connected in series.
The first resistor R1 and the second resistor R2 divide the voltage to generate a voltage signal UVLO. The voltage dividing proportion of the UVLO voltage can be adjusted by adjusting the sizes of the first resistor R1 and the second resistor R2 in the voltage dividing resistor, so that the voltage threshold value of the adjustable undervoltage protection circuit entering the undervoltage protection state is adjusted.
In some embodiments, the comparison circuit 3 comprises a comparator.
In some embodiments, the comparator comprises: the input end of the first current mirror is connected with the folding amplifier, and the output end of the first current mirror is connected with the folding amplifier;
the first current mirror is used for receiving a first current I1 and generating a second current I2 which is in a preset proportion with the first current I1 according to the first current I1, and the second current I2 is used for providing electric energy for the folding amplifier;
the folded amplifier is used for comparing a reference voltage and a divided voltage.
The first current mirror is capable of receiving a first current I1 and outputting a second current I2 in a preset proportion to the first current I1.
In some embodiments, the folded amplifier includes:
the first N-type controllable switch tube NM1, the second N-type controllable switch tube NM2, the third N-type controllable switch tube NM3, the fourth N-type controllable switch tube NM4, the second current mirror, the fifth P-type controllable switch tube PM5 and the sixth P-type controllable switch tube PM6;
the source electrode of the fifth P-type controllable switch tube PM5 and the source electrode of the sixth P-type controllable switch tube PM6 are commonly connected with the output end of the first current mirror, the grid electrode of the fifth P-type controllable switch tube PM5 is commonly connected with one end of the first resistor and one end of the second resistor, the drain electrode of the fifth P-type controllable switch tube PM5 is commonly connected with the grid electrode and the drain electrode of the first N-type controllable switch tube NM1, the grid electrode of the first N-type controllable switch tube NM1 is also connected with the grid electrode of the third N-type controllable switch tube NM3, the drain electrode of the third N-type controllable switch tube NM3 is connected with one end of the second current mirror, the drain electrode of the sixth P-type controllable switch tube PM6 is commonly connected with the grid electrode and the drain electrode of the second N-type controllable switch tube NM2, the grid electrode of the second N-type controllable switch tube NM2 is also connected with the grid electrode of the fourth N-type controllable switch tube NM4, and the other end of the fourth N-type controllable switch tube NM4 is connected with the second current mirror;
the source electrode of the first N-type controllable switch tube NM1, the source electrode of the second N-type controllable switch tube, the source electrode of the third N-type controllable switch tube NM3, the source electrode of the fourth N-type controllable switch tube NM4, the source electrodes of the fifth P-type controllable switch tube PM5 and the sixth P-type controllable switch tube PM6 are all grounded.
In some embodiments, the hysteresis feedback circuit 4 comprises: the inverter, the third current mirror, the eighth N-type controllable switch tube NM8 and the hysteresis resistor R3;
the input end of the inverter is connected with the output end of the folding amplifier, and the output end of the inverter is connected with the grid electrode of the eighth N-type controllable switching tube NM 8; one end of the hysteresis resistor R3 is commonly connected with the drain electrodes of the folding amplifier and the eighth N-type controllable switch tube NM8, and the other end of the hysteresis resistor R3 is connected with the reference voltage circuit 2; and a source electrode of the eighth N-type controllable switch tube NM8 is connected with one end of a third current mirror, and the other end of the third current mirror is grounded.
Specifically, the inverter includes: a seventh P-type controllable switch tube PM7 and a fifth N-type controllable switch tube NM5;
the grid electrode of the seventh P-type controllable switch tube PM7, the grid electrode of the fifth N-type controllable switch tube NM5, the output end of the second current mirror and the drain electrode of the fourth N-type controllable switch tube are connected together, the source electrode of the seventh P-type controllable switch tube PM7 is connected with the power supply voltage, the drain electrode of the seventh P-type controllable switch tube PM7 is connected with the drain electrode of the fifth N-type controllable switch tube NM5 and the grid electrode of the eighth N-type controllable switch tube NM8 together, and the source electrode of the fifth N-type controllable switch tube NM5 is grounded.
In some embodiments, the first current mirror comprises: the first P-type controllable switch tube PM1 and the second P-type controllable switch tube PM2;
the second current mirror includes: a third P-type controllable switch tube PM3 and a fourth P-type controllable switch tube PM4;
the third current mirror includes: a sixth N-type controllable switching tube NM6 and a seventh N-type controllable switching tube NM7.
Note that, the hysteresis feedback circuit 4 in the present application: the hysteresis current is input into a circuit input port HYS_CUR, and the hysteresis circuit is formed by the port, a seventh P-type controllable switch tube PM7, a fifth N-type controllable switch tube NM5, a sixth N-type controllable switch tube NM6, a seventh N-type controllable switch tube NM7, an eighth N-type controllable switch tube NM8 and a hysteresis resistor R3, so that the function of undervoltage protection voltage hysteresis is achieved. When the circuit works normally, UVLO_OK is low voltage, the voltage is output to a grid electrode of an eighth N-type controllable switch tube NM8 through an inverter formed by a seventh P-type controllable switch tube PM7 and a fifth N-type controllable switch tube NM5, so that the eighth N-type controllable switch tube NM8 is in an open state, at the moment, the current input from an HYS_CUR port can be transmitted to a hysteresis resistor R3 through a current mirror formed by a sixth N-type controllable switch tube NM6 and a seventh N-type controllable switch tube NM7, and the voltage drop is generated when the current flows through the hysteresis resistor R3, so that the voltage of the grid electrode of the sixth P-type controllable switch tube PM6 in the comparator (the original voltage is VREF) is reduced, and the purpose of undervoltage hysteresis is achieved; when the circuit works normally, the VIN voltage needs to be reduced to be lower than the undervoltage protection voltage by one hysteresis voltage, and then the circuit is in an undervoltage protection state; the hysteresis voltage value can be adjusted by adjusting the hysteresis resistor R3.
In the circuit provided by the application, a first P-type controllable switch tube PM1 and a second P-type controllable switch tube PM2 form a first current mirror, receive a current I1 and generate a second current I2 which is in a preset proportion with the current I1 to supply power to a folding amplifier for voltage comparison in the circuit; the first N-type controllable switch tube NM1, the second N-type controllable switch tube NM2, the third N-type controllable switch tube NM3, the fourth N-type controllable switch tube NM4, the third P-type controllable switch tube PM3, the fourth P-type controllable switch PM4, the fifth P-type controllable switch PM5 and the sixth P-type controllable switch PM6 form a folding amplifier for comparing the UVLO voltage with the VREF voltage.
An embodiment of the present application provides an electronic device, and an adjustable undervoltage protection circuit provided by any one of the embodiments above is applied
In summary, the present invention provides an adjustable under-voltage protection circuit and an electronic device, wherein the circuit includes a voltage adjusting circuit, a reference voltage circuit, a comparing circuit and a hysteresis feedback circuit; the reference voltage circuit generates a reference voltage; the voltage regulating circuit generates a divided voltage; the comparison circuit is used for comparing, when the divided voltage is larger than the reference voltage, a low-voltage logic signal is generated, and when the divided voltage is smaller than the reference voltage, a high-voltage logic signal is generated; the hysteresis feedback circuit controls the corresponding controllable switch tube to be conducted based on the low-voltage logic signal, and at the moment, the hysteresis feedback circuit is connected in series with a hysteresis resistor which generates voltage drop; the hysteresis feedback circuit turns off the controllable switching tube based on the high voltage logic signal. The power supply voltage can be judged in real time when the integrated circuit is used, and when the power supply voltage is insufficient, the working state of the control chip can be controlled through the hysteresis feedback circuit, so that the undervoltage protection mode is entered, and the circuit is prevented from being failed and cannot be recovered.
It can be understood that the system embodiments provided above correspond to the method embodiments described above, and the corresponding specific details may be referred to each other, which is not described herein again.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. An adjustable undervoltage protection circuit, comprising: the voltage regulation circuit, the reference voltage circuit, the comparison circuit and the hysteresis feedback circuit;
the reference voltage circuit is used for generating a reference voltage;
the voltage regulating circuit is used for carrying out voltage division on the power supply voltage to generate divided voltage;
one input end of the comparison circuit receives the reference voltage, the other input end of the comparison circuit receives the divided voltage, the comparison circuit is used for comparing the reference voltage with the divided voltage, when the divided voltage is larger than the reference voltage, a low-voltage logic signal is generated, and when the divided voltage is smaller than the reference voltage, a high-voltage logic signal is generated;
the hysteresis feedback circuit is used for controlling the conduction of a corresponding eighth N-type controllable switch tube based on the low-voltage logic signal, and is connected in series with a hysteresis resistor at the moment, and the hysteresis resistor generates voltage drop to reduce the reference voltage; the hysteresis feedback circuit turns off the eighth N-type controllable switch tube based on the high-voltage logic signal;
the voltage regulating circuit includes: the first resistor and the second resistor are connected in series;
the comparison circuit comprises a comparator;
the comparator includes: the input end of the first current mirror is connected with the folding amplifier, and the output end of the first current mirror is connected with the folding amplifier;
the first current mirror is used for receiving a first current and generating a second current which is in a preset proportion with the first current according to the first current, and the second current is used for providing electric energy for the folding amplifier;
the folding amplifier is used for comparing the reference voltage with the divided voltage;
the folded amplifier includes:
the first N-type controllable switch tube, the second N-type controllable switch tube, the third N-type controllable switch tube, the fourth N-type controllable switch tube, the second current mirror, the fifth P-type controllable switch tube and the sixth P-type controllable switch tube;
the source electrode of the fifth P-type controllable switch tube and the source electrode of the sixth P-type controllable switch tube are commonly connected with the output end of the first current mirror, the grid electrode of the fifth P-type controllable switch tube is commonly connected with one end of the first resistor and one end of the second resistor, the drain electrode of the fifth P-type controllable switch tube is commonly connected with the grid electrode and the drain electrode of the first N-type controllable switch tube, the grid electrode of the first N-type controllable switch tube is also connected with the grid electrode of the third N-type controllable switch tube, the drain electrode of the third N-type controllable switch tube is connected with one end of the second current mirror, the drain electrode of the sixth P-type controllable switch tube is commonly connected with the grid electrode and the drain electrode of the second N-type controllable switch tube, the grid electrode of the second N-type controllable switch tube is also connected with the grid electrode of the fourth N-type controllable switch tube, and the drain electrode of the fourth N-type controllable switch tube is also connected with the other end of the second current mirror;
the source electrode of the first N-type controllable switch tube, the source electrode of the second N-type controllable switch tube, the source electrode of the third N-type controllable switch tube, the source electrode of the fourth N-type controllable switch tube, the source electrodes of the fifth P-type controllable switch tube and the sixth P-type controllable switch tube are all grounded;
the hysteresis feedback circuit includes: the device comprises an inverter, a third current mirror, an eighth N-type controllable switch tube and a hysteresis resistor;
the input end of the inverter is connected with the output end of the folding amplifier, and the output end of the inverter is connected with the grid electrode of the eighth N-type controllable switch tube; one end of the hysteresis resistor is commonly connected with the drain electrodes of the folding amplifier and the eighth N-type controllable switch tube, and the other end of the hysteresis resistor is connected with a reference voltage circuit; the source electrode of the eighth N-type controllable switch tube is connected with one end of a third current mirror, and the other end of the third current mirror is grounded;
the inverter includes: a seventh P-type controllable switch tube and a fifth N-type controllable switch tube;
the grid electrode of the seventh P-type controllable switch tube, the grid electrode of the fifth N-type controllable switch tube, the output end of the second current mirror and the drain electrode of the fourth N-type controllable switch tube are connected together, the source electrode of the seventh P-type controllable switch tube is connected with the power supply voltage, the drain electrode of the seventh P-type controllable switch tube is connected with the drain electrode of the fifth N-type controllable switch tube and the grid electrode of the eighth N-type controllable switch tube together, and the source electrode of the fifth N-type controllable switch tube is grounded;
the first current mirror includes: the first P-type controllable switch tube and the second P-type controllable switch tube;
the second current mirror includes: the third P-type controllable switch tube and the fourth P-type controllable switch tube;
the third current mirror includes: a sixth N-type controllable switch tube and a seventh N-type controllable switch tube.
2. An electronic device, characterized in that the adjustable under-voltage protection circuit of claim 1 is applied.
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| US9520772B2 (en) * | 2010-11-09 | 2016-12-13 | Tdk-Lambda Corporation | Multi-level voltage regulator system |
| CN102709883B (en) * | 2012-05-11 | 2014-08-06 | 东南大学 | Under-voltage protection circuit of switch power source |
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