CN116191348A - Current sampling and overcurrent protection circuit, system and method based on negative feedback adjustment - Google Patents

Current sampling and overcurrent protection circuit, system and method based on negative feedback adjustment Download PDF

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Publication number
CN116191348A
CN116191348A CN202310128892.2A CN202310128892A CN116191348A CN 116191348 A CN116191348 A CN 116191348A CN 202310128892 A CN202310128892 A CN 202310128892A CN 116191348 A CN116191348 A CN 116191348A
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Prior art keywords
resistor
channel mos
overcurrent protection
operational amplifier
current sampling
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CN202310128892.2A
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Chinese (zh)
Inventor
谢灿华
王天林
刘国安
胡健
冯地明
徐腾
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ZHEJIANG SUPCON RESEARCH CO LTD
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ZHEJIANG SUPCON RESEARCH CO LTD
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Priority to CN202310128892.2A priority Critical patent/CN116191348A/en
Publication of CN116191348A publication Critical patent/CN116191348A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • 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
    • H02H3/08—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 excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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  • Emergency Protection Circuit Devices (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)

Abstract

The invention discloses a current sampling and overcurrent protection circuit based on negative feedback regulation, which comprises: the load loop comprises a sampling resistor, the operational amplifier comprises a second resistor, a PMOS tube, a voltage dividing component and an NMOS tube, the inverting input end of the operational amplifier is connected with the first end of the sampling resistor through the second resistor, the non-inverting input end of the operational amplifier is connected with the second end of the sampling resistor, the output end of the operational amplifier is connected with the grid electrode of the PMOS tube, the inverting input end of the operational amplifier is connected with the source electrode of the PMOS tube, the drain electrode of the PMOS tube is connected with the ADC input end of the control system processor unit, the drain electrode of the PMOS tube is connected with the first end of the voltage dividing component, the second end of the voltage dividing component is connected with the grid electrode of the NMOS tube, the third end of the voltage dividing component is connected with the source electrode of the NMOS tube and is grounded, and the drain electrode of the NMOS tube is connected with the low-voltage power supply and is connected with the interrupt input end of the control system processor unit. The circuit has simple structure and rapid overcurrent protection response.

Description

Current sampling and overcurrent protection circuit, system and method based on negative feedback adjustment
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a current sampling and overcurrent protection circuit, system and method based on negative feedback regulation.
Background
All components in the electronic circuit have working currents, when the current in the circuit exceeds the working current, the components are damaged, the electronic circuit cannot work normally, and the electronic circuit is burnt out due to short circuit caused by heavy weight. Therefore, it is necessary to monitor the circuit current in real time and cut off the power supply circuit in time when the overcurrent occurs.
In the prior art, current sampling and overcurrent protection are generally performed in the following ways:
(1) Directly sampling current by using a sampling resistor;
the voltage drop on the sampling resistor is measured by the ADC without processing circuits such as an operational amplifier, when high current is sampled, only a resistor with a small resistance value can be selected in order to ensure the overcurrent capacity, the voltage=current is the resistor, a small voltage signal range is usually obtained, the signal is directly sent to the ADC chip or the singlechip, and the sampling current precision is poor.
(2) Sampling current by using a sampling resistor through a processing circuit such as a differential operational amplifier and the like;
the low-end sampling circuit introduces ground wire interference to influence sampling precision, and the high-end sampling circuit has higher selection requirement on the operational amplifier, and the cost can be greatly increased by adopting the low-offset voltage high-precision operational amplifier.
(3) Adopting a Hall sensor or a current transformer to sample current;
the transformer is generally applied to specific occasions, and when the transformer is used for measuring direct current with large current, the volume is required to be large, and the installation is influenced; when a hall sensor is used for measuring small-range current, a large bias voltage is required to be used, errors are easy to cause, and the hall sensor is large in size and high in cost.
(4) The ADC is adopted to detect overcurrent so as to cut off a power supply loop for overcurrent protection;
when the ADC detects an overcurrent signal, the singlechip outputs a turn-off signal through the internal logic processing of the control unit, and the power supply loop is disconnected, so that the response time of the process is slower, and the circuit may be burnt out due to the excessively long overcurrent time before the power supply circuit is disconnected.
(5) Carrying out overcurrent protection in a hardware mode;
the over-current signal detection is generally carried out by adopting a comparator or a logic device, the output control signal directly turns off the power supply loop, the mode is not processed by software, a hardware protection circuit is required to be additionally arranged, and the cost is high.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a current sampling and overcurrent protection circuit based on negative feedback regulation, which collects the voltage of an input end of an ADC in real time, thereby calculating the real-time current in an operational amplifier loop and realizing real-time monitoring. Meanwhile, the current sampling input voltage range and the overcurrent threshold can be linearly adjusted according to the sizes of the sampling resistor and the divider resistor, and the sampling precision is improved.
In order to achieve the above purpose, the technical scheme of the invention is as follows: a negative feedback regulation based current sampling and overcurrent protection circuit, comprising: the load loop comprises a sampling resistor, the operational amplifier comprises a second resistor, a P-channel MOS tube, a voltage dividing component and an N-channel MOS tube, the inverting input end of the operational amplifier is connected with the first end of the sampling resistor through the second resistor, the non-inverting input end of the operational amplifier is connected with the second end of the sampling resistor, the output end of the operational amplifier is connected with the grid electrode of the P-channel MOS tube, the inverting input end of the operational amplifier is connected with the source electrode of the P-channel MOS tube, the drain electrode of the P-channel MOS tube is connected with the ADC input end of the control system processor unit, the drain electrode of the P-channel MOS tube is connected with the first end of the voltage dividing component, the second end of the voltage dividing component is connected with the grid electrode of the N-channel MOS tube, the third end of the voltage dividing component is connected with the source electrode of the N-channel MOS tube and grounded, and the drain electrode of the N-channel MOS tube is connected with the low-voltage power supply and is connected with the interrupt input end of the control system processor unit.
In one embodiment of the invention, the drain electrode of the P-channel MOS transistor is connected to the ADC input end of the control system processor unit through a voltage stabilizing filter circuit, the voltage stabilizing filter circuit includes a fourth resistor, a first end of the fourth resistor is connected to the drain electrode of the P-channel MOS transistor, a second end of the fourth resistor is connected to the ADC input end of the control system processor unit, and a second end of the fourth resistor is grounded through a second capacitor and a voltage stabilizing tube connected in parallel.
In one embodiment of the present invention, a drain electrode of the N-channel MOS transistor is connected to an interrupt input terminal of the control system processor unit through a level conversion circuit, the level conversion circuit is connected in series to an eighth resistor, a ninth resistor and a third capacitor, the drain electrode of the N-channel MOS transistor is connected to a second terminal of the eighth resistor, the second terminal of the ninth resistor is connected to an interrupt input terminal of the control system processor unit, the second terminal of the third capacitor is grounded, and the first terminal of the eighth resistor is connected to the low voltage power supply.
In one embodiment of the invention, the positive and negative inputs of the operational amplifier are connected with a first capacitor.
In one embodiment of the present invention, a drain of the P-channel MOS transistor is connected to a first end of a fourth resistor in the voltage stabilizing filter circuit through a first diode.
In one embodiment of the invention, the voltage dividing component comprises a fifth resistor, a sixth resistor and a seventh resistor which are connected in a triangle shape, wherein a common node of the fifth resistor and the sixth resistor is connected with the drain electrode of the P-channel MOS tube, the common node of the fifth resistor and the seventh resistor is grounded, and the common node of the sixth resistor and the seventh resistor is connected with the gate electrode of the N-channel MOS tube.
In one embodiment of the invention, the positive power supply input terminal and the negative power supply input terminal of the operational amplifier are respectively connected with a positive power supply and ground.
Based on the same inventive concept, the invention also provides a current sampling and overcurrent protection system based on negative feedback regulation, which comprises a processor unit and the current sampling and overcurrent protection circuit based on negative feedback regulation, wherein the processor unit samples and overcurrent protects a load loop based on an electric signal sent by the current sampling and overcurrent protection circuit.
Based on the same inventive concept, the invention also provides a current sampling and overcurrent protection method based on negative feedback regulation, which is applied to the current sampling and overcurrent protection system based on negative feedback regulation, and comprises the following steps: collecting an electric signal in an operational amplifier loop through an ADC input end; calculating the current in the load loop according to a preset algorithm based on the electrical signal; and under the condition that the current in the load loop is larger than a preset threshold value, the N-channel MOS tube is conducted, the processor interrupts voltage jump at the input end, and the load loop is controlled to execute preset interrupt measures.
Based on the same inventive concept, the present invention also provides a computer apparatus comprising: a memory for storing a processing program; and the processor is used for realizing the current sampling and overcurrent protection method based on negative feedback adjustment when executing the processing program.
By adopting the technical scheme, the invention has the following advantages and positive effects compared with the prior art:
1. the invention collects the voltage of the input end of the ADC in real time, thereby calculating the real-time current in the operational amplifier loop and realizing real-time monitoring. Meanwhile, the current sampling input voltage range and the overcurrent threshold can be linearly adjusted according to the sizes of the sampling resistor and the divider resistor, and the sampling precision is improved.
2. According to the invention, through monitoring the current in the operational amplifier loop in real time, under the condition that the loop current exceeds the threshold value, the N-channel MOS tube M2 is instantaneously conducted and fed back to the processor unit through the level conversion circuit, the processor unit rapidly performs interrupt processing, the rapid turn-off of the main loop is realized, the response is rapid, and further circuit damage is avoided.
3. The circuit has the advantages of simple composition, fewer components, no too high requirement on the type selection of the operational amplifier and lower cost; the integrated current sampling circuit and the overcurrent protection circuit do not need to be designed separately, and can meet the requirement of overcurrent quick turn-off protection; the current sampling input voltage range and the overcurrent threshold are in linear relation with the load current, the resistance values of the sampling resistor and the divider resistor can be flexibly adjusted, and the current sampling input voltage range and the overcurrent threshold are adapted to the input voltage requirements of different ADC units and IO ports of the singlechip, so that wide-range current sampling is realized.
Drawings
The invention is described in further detail below with reference to the attached drawing figures, wherein:
fig. 1 is a circuit diagram of current sampling and overcurrent protection based on negative feedback regulation according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the specific examples. Advantages and features of the invention will become more apparent from the following description and from the claims. It is noted that the drawings are in a very simplified form and utilize non-precise ratios, and are intended to facilitate a convenient, clear, description of the embodiments of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
As shown in fig. 1, the present embodiment provides a current sampling and overcurrent protection circuit based on negative feedback regulation, and adopts a high-end sampling mode, where the circuit includes a LOAD loop, an operational amplifier loop and a level conversion loop, the LOAD loop includes a power supply, a fuse F1, a sampling resistor R1, and an external LOAD, the operational amplifier loop includes a second resistor R2, an operational amplifier U1, a P-channel MOS transistor M1, a first diode D1, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7, two ends of the second resistor R2 are respectively connected with a second end of the fuse F1 and an inverting input end of the operational amplifier U1, a positive input end and a negative input end of the power supply of the operational amplifier U1 are respectively connected with a positive power supply and a ground, an output end of the operational amplifier U1 is connected with a gate of a P-channel MOS transistor M1, a source of the P-channel MOS transistor M1 is connected with a first end of the second resistor R2, a drain of the first diode D5 is connected with the first end of the first resistor R1, a drain of the first diode is connected with the first end of the fifth resistor R6, and a drain of the first resistor is connected with the first end of the fifth resistor R5.
Further, the first diode D1 is connected to the ADC input terminal of the processor unit through a voltage stabilizing filter circuit, where the voltage stabilizing filter circuit includes a fourth resistor R4 connected to the second terminal of the first diode D1, the second terminal of the fourth resistor R4 is connected to the ADC input terminal of the processor unit, and the second terminal of the fourth resistor R4 is grounded through a second resistor C2 and a voltage stabilizing tube D2 connected in parallel. The first diode D1 is used for reverse current protection.
Further, the drain electrode of the N-channel MOS tube is connected with the interrupt input end of the processor unit through a level conversion circuit, the level conversion circuit comprises a low-voltage power supply, an eighth resistor R8, a ninth resistor R9 and a third capacitor C3 which are sequentially connected in series, the drain electrode of the N-channel MOS tube is connected with the second end of the eighth resistor R8, the second end of the ninth resistor R9 is connected with the interrupt input end of the processor unit, and the second end of the third capacitor C3 is grounded.
Further, a first capacitor C1 is connected between the non-inverting input terminal and the inverting input terminal of the operational amplifier U1. The output end of the operational amplifier U1 is connected with the grid electrode of the P-channel MOS tube through a third resistor R3.
Further, the adjustment of sampling accuracy can be achieved by linearly adjusting the resistance values of the voltage dividing resistor second resistor R2, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the sampling resistor R1.
In the load loop, the sampling resistor R1 feeds back load current and provides the voltage of the inverting input end of the operational amplifier U1; in the operational amplifier loop, the voltage of the inverting input end of the operational amplifier U1 is provided by the voltage division of the second resistor R2; because the operational amplifier U1 has the characteristics of high open loop gain, low output impedance and the like, the input current is very small, and therefore, when the negative feedback system is regulated to a balanced state, the sampling resistor R1 and the second resistor R2 are fed back to the operational amplifier U1, the voltages of the inverting input end and the non-inverting input end are equal, and the voltages of the two ends of the sampling resistor R1 are equal to the voltages of the two ends of the second resistor R2 and are in linear relation with the load current; in the operational amplifier circuit, the current flowing through the second resistor R2 is equal to the current flowing through the combined resistor of the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7. The voltage at the input end of the ADC of the input processor unit is the partial pressure of a synthesized resistor of the combination of a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7 in an operational amplifier loop, the voltage and the load current are in a linear change relation, and the load current is calculated through the collected voltage, and the calculation mode is as follows:
the combined resistance of the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 is R C ：R C ＝R5*(R6+R7)/(R5+R6+R7)；
Load loop current I L The method comprises the following steps: i L ＝(VIN－V - )/R1；
The voltage of the inverting input end and the non-inverting input end of the operational amplifier U1 are approximately equal, namely: v (V) - ＝V +；
The operational amplifier loop current is: i C ＝(VIN－V + )/R2；
The voltage at the input end of the ADC of the processor unit is as follows:
V I_AD ＝R C *Ic＝[R5*(R6+R7)/(R5+R6+R7)]*I L *R1/R2。
the processor unit interrupts the input voltage to default to a high level and, in the event of overload, the load loop current I L Increasing the operational amplifier loop current I C When the grid voltage of the N-channel MOS tube M2 is increased and reaches the grid threshold voltage, the N-channel MOS tube M2 is conducted, the voltage jump of the interrupt input end of the processor unit is changed to a low level, the system processor executes an interrupt command, the power supply is disconnected, and the overcurrent protection function is achieved. The judgment mode of the level jump of the interrupt port is as follows:
grid voltage V of N channel MOS tube M2 M2 ＝V I_AD *R7/(R6+R7)；
The processor unit interrupts the input level jump condition: v (V) M2 >V GS(th) 。
In the application, the processor unit collects the voltage of the ADC input end in real time, so that the real-time current in the operational amplifier loop is calculated, and real-time monitoring is realized. Meanwhile, the current sampling input voltage range and the overcurrent threshold can be linearly adjusted according to the sizes of the sampling resistor and the divider resistor, and the sampling precision is improved. In the technical scheme of the application, through the current in the real-time monitoring operational amplifier circuit, under the condition that the circuit current exceeds the threshold value, the N-channel MOS tube M2 is instantly conducted and fed back to the processor unit through the level conversion circuit, the processor unit rapidly makes interrupt processing, the quick turn-off of the main circuit is realized, the response is rapid, and further circuit damage is avoided.
The circuit has the advantages of simple composition, fewer components, no too high requirement on the type selection of the operational amplifier and lower cost; the integrated current sampling circuit and the overcurrent protection circuit do not need to be designed separately, and can meet the requirement of overcurrent quick turn-off protection; the current sampling input voltage range and the overcurrent threshold are in linear relation with the load current, the resistance values of the sampling resistor and the divider resistor can be flexibly adjusted, and the current sampling input voltage range and the overcurrent threshold are adapted to the input voltage requirements of different ADC units and IO ports of the singlechip, so that wide-range current sampling is realized.
Based on the same inventive concept, the invention also provides a current sampling and overcurrent protection system based on negative feedback regulation, which comprises a processor unit and the current sampling and overcurrent protection circuit based on negative feedback regulation, wherein the processor unit samples and overcurrent protects a load loop based on an electric signal sent by the current sampling and overcurrent protection circuit.
Based on the same inventive concept, the invention also provides a current sampling and overcurrent protection method based on negative feedback regulation, which is applied to the current sampling and overcurrent protection system based on negative feedback regulation, and comprises the following steps: collecting an electric signal in an operational amplifier loop through an ADC input end; calculating the current in the load loop according to a preset algorithm based on the electrical signal; and under the condition that the current in the load loop is larger than a preset threshold value, the N-channel MOS tube is conducted, the processor interrupts voltage jump at the input end, and the load loop is controlled to execute preset interrupt measures.
Based on the same inventive concept, the present invention also provides a computer apparatus comprising: a memory for storing a processing program; and the processor is used for realizing the current sampling and overcurrent protection method based on negative feedback adjustment when executing the processing program.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, where the program, when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: a removable storage device, a read only memory (ReadOnlyMemory, ROM), a magnetic or optical disk, or other various media capable of storing program code.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is within the scope of the appended claims and their equivalents to fall within the scope of the invention.

Claims (10)

1. A current sampling and overcurrent protection circuit based on negative feedback regulation, comprising: the load loop comprises a sampling resistor, the operational amplifier comprises a second resistor, a P-channel MOS tube, a voltage dividing component and an N-channel MOS tube, the inverting input end of the operational amplifier is connected with the first end of the sampling resistor through the second resistor, the non-inverting input end of the operational amplifier is connected with the second end of the sampling resistor, the output end of the operational amplifier is connected with the grid electrode of the P-channel MOS tube, the non-inverting input end of the operational amplifier is connected with the source electrode of the P-channel MOS tube, the drain electrode of the P-channel MOS tube is connected with the ADC input end of the control system processor unit, the drain electrode of the P-channel MOS tube is connected with the first end of the voltage dividing component, the second end of the voltage dividing component is connected with the grid electrode of the N-channel MOS tube, the third end of the voltage dividing component is connected with the source electrode of the N-channel MOS tube and grounded, and the drain electrode of the N-channel MOS tube is connected with the low-voltage power supply and is connected with the interrupt input end of the control system processor unit.
2. The negative feedback regulation-based current sampling and overcurrent protection circuit according to claim 1, wherein the drain electrode of the P-channel MOS transistor is connected to the ADC input end of the control system processor unit through a voltage stabilizing filter circuit, the voltage stabilizing filter circuit includes a fourth resistor, the first end of the fourth resistor is connected to the drain electrode of the P-channel MOS transistor, the second end of the fourth resistor is connected to the ADC input end of the control system processor unit, and the second end of the fourth resistor is grounded through a second capacitor and a voltage stabilizing tube connected in parallel.
3. The negative feedback regulation-based current sampling and overcurrent protection circuit according to claim 1, wherein the drain electrode of the N-channel MOS transistor is connected to the interrupt input end of the control system processor unit through a level conversion circuit, the level conversion circuit is connected in series with an eighth resistor, a ninth resistor and a third capacitor, the drain electrode of the N-channel MOS transistor is connected to the second end of the eighth resistor, the second end of the ninth resistor is connected to the interrupt input end of the control system processor unit, the second end of the third capacitor is grounded, and the first end of the eighth resistor is connected to the low-voltage power supply.
4. The negative feedback regulation-based current sampling and overcurrent protection circuit of claim 1, wherein the operational amplifier has a first capacitor connected to the positive input and the negative input.
5. The negative feedback regulation-based current sampling and overcurrent protection circuit according to claim 2, wherein the drain electrode of the P-channel MOS transistor is connected to the first end of the fourth resistor in the voltage stabilizing filter circuit through a first diode.
6. The negative feedback regulation-based current sampling and overcurrent protection circuit according to claim 1, wherein the voltage dividing component comprises a fifth resistor, a sixth resistor and a seventh resistor which are connected in a triangle shape, a common node of the fifth resistor and the sixth resistor is connected with the drain electrode of the P-channel MOS tube, the common node of the fifth resistor and the seventh resistor is grounded, and the common node of the sixth resistor and the seventh resistor is connected with the gate electrode of the N-channel MOS tube.
7. The negative feedback regulation-based current sampling and overcurrent protection circuit of claim 1, wherein the positive power supply input terminal and the negative power supply input terminal of the operational amplifier are respectively connected with a positive power supply and ground.
8. A current sampling and overcurrent protection system based on negative feedback regulation, comprising a processor unit and the current sampling and overcurrent protection circuit based on negative feedback regulation according to any one of claims 1 to 7, wherein the processor unit samples and overcurrent protects a load loop based on an electrical signal sent by the current sampling and overcurrent protection circuit.
9. The current sampling and overcurrent protection method based on negative feedback regulation, which is applied to the current sampling and overcurrent protection system based on negative feedback regulation as claimed in claim 8, is characterized by comprising the following steps:
collecting an electric signal in an operational amplifier loop through an ADC input end;
calculating the current in the load loop according to a preset algorithm based on the electrical signal;
and under the condition that the current in the load loop is larger than a preset threshold value, the N-channel MOS tube is conducted, the processor interrupts voltage jump at the input end, and the load loop is controlled to execute preset interrupt measures.
10. A computer device, comprising:
a memory for storing a processing program;
a processor that implements the negative feedback adjustment-based current sampling and overcurrent protection method of claim 9 when executing the processing program.
CN202310128892.2A 2023-02-17 2023-02-17 Current sampling and overcurrent protection circuit, system and method based on negative feedback adjustment Pending CN116191348A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN202310128892.2A CN116191348A (en) 2023-02-17 2023-02-17 Current sampling and overcurrent protection circuit, system and method based on negative feedback adjustment

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116773896A (en) * 2023-08-23 2023-09-19 深圳市新蕾电子有限公司 Current detection circuit
CN117155296A (en) * 2023-10-27 2023-12-01 上海紫鹰微电子有限公司 Current loop error amplifying circuit and driving chip
CN117411449A (en) * 2023-12-14 2024-01-16 浙江地芯引力科技有限公司 Current sampling amplifying circuit, chip and electronic equipment

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116773896A (en) * 2023-08-23 2023-09-19 深圳市新蕾电子有限公司 Current detection circuit
CN116773896B (en) * 2023-08-23 2023-11-21 深圳市新蕾电子有限公司 Current detection circuit
CN117155296A (en) * 2023-10-27 2023-12-01 上海紫鹰微电子有限公司 Current loop error amplifying circuit and driving chip
CN117155296B (en) * 2023-10-27 2024-02-06 上海紫鹰微电子有限公司 Current loop error amplifying circuit and driving chip
CN117411449A (en) * 2023-12-14 2024-01-16 浙江地芯引力科技有限公司 Current sampling amplifying circuit, chip and electronic equipment
CN117411449B (en) * 2023-12-14 2024-04-05 浙江地芯引力科技有限公司 Current sampling amplifying circuit, chip and electronic equipment

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