CN117394292A - Overcurrent protection circuit based on adjustable constant current voltage stabilizer CCR - Google Patents

Overcurrent protection circuit based on adjustable constant current voltage stabilizer CCR Download PDF

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Publication number
CN117394292A
CN117394292A CN202311347660.2A CN202311347660A CN117394292A CN 117394292 A CN117394292 A CN 117394292A CN 202311347660 A CN202311347660 A CN 202311347660A CN 117394292 A CN117394292 A CN 117394292A
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Prior art keywords
iso
constant current
voltage
adjustable constant
output
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郑利
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Guangzhou Jiazhou Technology Co ltd
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Guangzhou Jiazhou Technology Co ltd
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Priority to CN202311347660.2A priority Critical patent/CN117394292A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/025Current limitation using field effect transistors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02Details
    • H02H3/04Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08Emergency 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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

Abstract

The invention relates to the technical field of circuit protection, in particular to an overcurrent protection circuit based on an adjustable constant current voltage stabilizer CCR, which comprises N adjustable constant current voltage stabilizing branches, wherein the adjustable constant current voltage stabilizing branches comprise an MCU micro-control unit, and a 5.0v power supply voltage device, a GPO1 program controller, a GPO11 group policy controller, a wire grounding end, an output socket P1, voltage stabilizing tubes R2, D2, U1 optocouplers, R3 and ISO_OUT_OK1 are arranged in the MCU micro-control unit. The invention provides high-efficiency support for the regulating current of the load in the circuit through the adjustable constant current voltage regulator CCR, can realize the regulating current in a wider voltage range based on a self-bias transistor (SBT) technology, has sustainable short-circuit protection, simultaneously comprises over-power protection, avoids the occurrence of over-power caused by mistakenly touching a new extended external device with higher power during debugging, and avoids irreversible damage to an isolated power supply module.

Description

Overcurrent protection circuit based on adjustable constant current voltage stabilizer CCR
Technical Field
The invention relates to the technical field of circuit protection, in particular to an overcurrent protection circuit based on an adjustable constant current voltage stabilizer (CCR).
Background
The Automatic Guided Vehicle (AGV) is used for loading goods automatically or manually, the goods-carrying trolley is automatically driven or pulled to a specified place according to a set route, and then the industrial vehicle for loading and unloading goods automatically or manually is widely used along with the strong development of the AGV carrying robot technology. The magnetic stripe guiding mode is a common mode with the lowest cost, but sites are provided with certain limitations, so that AGVs are increasingly applied to various factory scenes with certain influence on the field decoration style;
in order to improve anti-interference capability, an AGV main control board often adopts a design scheme of an isolation circuit in low-power peripheral equipment with serious interference, such as a peripheral encoder for a motor, a transmission signal interface and the like, wherein a low-power isolation transformer with a PCB installation mode is needed, and common low-power isolation transformers such as B0512XT-1WR3 (12V/84 mA output) do not contain overcurrent protection although having sustainable short-circuit protection, if the high-power peripheral equipment is connected by mistake during debugging, the overcurrent condition can be caused, so that irreversible damage is brought to an isolation power supply module, and because the low-current overcurrent protection circuit is often too complex, great trouble is brought to normal operation of products.
In view of this, we propose an over-current protection circuit based on an adjustable constant current regulator CCR.
Disclosure of Invention
In order to make up for the defects, the invention provides an overcurrent protection circuit based on an adjustable constant current voltage stabilizer CCR.
The technical scheme of the invention is as follows:
an overcurrent protection circuit based on an adjustable constant current voltage stabilizer CCR comprises N adjustable constant current voltage stabilizing branches, wherein the input end of each adjustable constant current voltage stabilizing branch is connected with the output end of a driving circuit to be tested, N is a positive integer, and the adjustable constant current voltage stabilizing branches comprise:
the MCU micro-control unit is internally provided with a 5.0v power supply voltage device, a GPO1 program controller, a GPO11 group strategy controller, an electric wire grounding end, an output socket P1, voltage stabilizing tubes R2, D2 and U1 optocouplers, R3 and ISO_OUT_OK1;
the GPO1 program controller is connected with a power triode and a field effect tube, the power triode and the field effect tube form an electronic enabling switch, the power triode and the field effect tube are connected with an ISO-OUT, and the ISO-OUT is used for outputting voltage;
the power triode is connected with an input filter device and an output filter capacitor;
the field effect tube is connected with a voltage stabilizing tube and an input light emitting diode.
As a preferable technical scheme, the input filter component consists of L1, C3 and C4, wherein L1, C3 and C4 are input filter components of the transformer and are used for smoothing and filtering input voltages.
As an optimal technical scheme, the output filter capacitor consists of C1 and C2, wherein the C1 and C2 are output filter flashlights of an isolation transformer and are used for smoothing filter output voltage.
As a preferable technical solution, the output socket P1 is an output socket portion of an isolated power supply, and is used for stably supplying power to a circuit by externally connecting an extended external device.
As an optimal technical scheme, the R2 and D2 voltage stabilizing tubes and the input light emitting diode of the U1 optocoupler form a threshold voltage detection circuit which can be used for feeding back the state of the output voltage ISO-OUT and feeding back the state to the MCU micro control unit for the MCU micro control unit to receive and process.
As an preferable technical scheme, the R3 and iso_out_ok1 are pull-up circuits of the GPO11 group policy controller, and the iso_out_ok1 is used as an indicator light for threshold voltage detection.
As a preferable technical scheme, when the output voltage of the ISO-OUT is greater than 5.1v, the U1 outputs a high voltage while the ISO_OUT_OK1 performs normal indication luminescence, when the output voltage of the ISO-OUT is less than 5.1v, the receiving triode of the U1 is cut off while the ISO_OUT_OK1 is extinguished, and at the moment, the GPO11 group strategy controller reads the high voltage to indicate that the output voltage of the ISO-OUT is abnormal.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides high-efficiency support for the regulating current of the load in the circuit through the adjustable constant current voltage regulator CCR, can realize the regulating current in a wider voltage range based on a self-bias transistor (SBT) technology, has sustainable short-circuit protection and over-power protection, avoids the occurrence of over-power caused by mistakenly touching a new high-power expansion external device during debugging, avoids irreversible damage to an isolated power supply module, provides a more cost-effective scheme, and can be used for driving equipment such as LEDs.
2. The invention avoids the occurrence of thermal breakdown of equipment loads such as LEDs and the like under low-end voltage or current by realizing the negative temperature coefficient, and meanwhile, the CCR is different from a fixed parameter limiting value of a constant current diode CCD, the biggest difference is that the CCR is provided with a Radj pin, and the resistance value of the resistor is adjusted by connecting the resistor between the Radj pin and a cathode, so that the Ireg (SS) limiting value can be adjusted in a certain range, the Ireg (SS) limiting value can be more accurately matched with the overcurrent protection requirement of small current in a circuit, and meanwhile, the CCR can be more flexibly used under specific conditions, and the efficiency is enhanced.
3. The internal device does not need to be supported by an external element, is used for the high-voltage side or low-voltage side voltage stabilization, and meanwhile, the internal electronic components are fewer, so that the cost of the whole circuit is lower, the circuit is simplified, and more reliable support is provided.
Drawings
FIG. 1 is a circuit diagram of an over-current protection circuit based on an adjustable constant current voltage regulator CCR according to the present invention;
FIG. 2 is a diagram of the components of an MCU micro-control unit of an over-current protection circuit based on an adjustable constant current voltage regulator CCR;
FIG. 3 is a circuit diagram of an over-current protection circuit based on an adjustable constant current voltage regulator CCR according to the present invention;
fig. 4 is a system diagram of an over-current protection circuit based on an adjustable constant current regulator CCR according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1-3, an over-current protection circuit based on an adjustable constant current voltage stabilizer CCR includes N adjustable constant current voltage stabilizing branches, an input end of each adjustable constant current voltage stabilizing branch is connected to an output end of a driving circuit to be tested, N is a positive integer, and the adjustable constant current voltage stabilizing branches include:
the MCU micro-control unit is internally provided with a 5.0v power supply voltage device, a GPO1 program controller, a GPO11 group strategy controller, an electric wire grounding end, an output socket P1, voltage stabilizing tubes R2, D2 and U1 optocouplers and R3 and ISO_OUT_OK1;
the GPO1 program controller is connected with a power triode and a field effect tube, the power triode and the field effect tube form an electronic enabling switch, the power triode and the field effect tube are connected with an ISO-OUT, and the ISO-OUT is used for outputting voltage;
the power triode is connected with an input filter device and an output filter capacitor;
the field effect tube is connected with a voltage stabilizing tube and an input light emitting diode.
When the GPO1 program controller is in a high position, Q1 is conducted and output, M1 is powered on and works, and ISO_OUT voltage is output to the outside; when the GPO1 program controller is low, Q1 is cut off, M1 loses power and does not work, ISO_OUT voltage is not output to the outside, wherein the input end of the 5.0v power supply voltage device is used as the input end of the adjustable constant current voltage stabilizing branch circuit to be connected with the output end of the driving circuit to be tested, the output voltage end of the 5.0v power supply voltage device is connected with the wire grounding end through each branch circuit, the grounding port of the 5.0v power supply voltage device is connected with the wire grounding end, and meanwhile, the 5.0v power supply voltage device has the characteristic of outputting constant voltage and simultaneously has the characteristic that output current is equal to input current.
When the GPO1 program controller is in a high position, the ISO_OUT outputs the data, if the GPI1 is detected to be too high, the ISO-OUT outputs overcurrent protection, when the GP01 is in a low position, the ISO-OUT outputs protection is closed, the user is suspended through an indicator lamp and is reminded to be reminded, and the user is notified of processing;
when GPI1 is detected to be in the low order, ISO-OUT performs normal output at this time.
It should be noted that, Q1 is a field effect transistor assembly with model number LRLML6402, Q2 is a field effect transistor with model number 2N7002KT1G, and D2 is a current stabilizing current management assembly with model number NSI45060JDT 4G.
It should be added that the input filter component consists of L1, C3 and C4, where L1, C3 and C4 are input filters of the transformer for smoothing the input voltage, where L1 adopts magnetic ring inductance with model number PZ1608D121-2R0 TF.
As a preferred embodiment, the output filter capacitor is composed of C1 and C2, and C1 and C2 are output filter flashlights of the isolation transformer, which are used for smoothing the filtered output voltage.
The resistance of Radj1 is adjusted to be kept between 60mA and 100mA, and the constant current value of NSI45060JDT4G is adjusted to be exactly matched with the current protection output value requirement of the isolation module, for example, if Radj1 is taken as a 30K resistance, the constant current value is adjusted to be 80mA.
As a preferred embodiment, the output socket P1 is an output socket portion of an isolated power supply for stably supplying power to a circuit by externally connecting an extended external device.
As the optimization of the embodiment, the R2 and D2 voltage stabilizing tubes and the input light emitting diode of the U1 optocoupler form a threshold voltage detection circuit which can be used for feeding back the state of the output voltage ISO-OUT and feeding back the state to the MCU micro-control unit for the MCU micro-control unit to receive and process.
It should be noted that R3 and iso_out_ok1 are pull-up circuits of the GPO11 group policy controller, and iso_out_ok1 is used as an indicator light for threshold voltage detection.
In summary, it can be seen that, through the adjustable constant current voltage regulator CCR, a high-efficiency support is provided for the regulating current of the load in the circuit, it is based on the self-bias transistor (SBT) technology, it can realize the regulating current in a wider voltage range, it not only possesses sustainable short-circuit protection, and simultaneously, it includes the overpower protection, the condition that the new expansion external equipment of the higher power of mistake touch causes the overpower to happen has been avoided in the debugging, avoid bringing irreversible damage to the isolated power module, it provides more efficient scheme of cost, and can be used for driving equipment such as LEDs, through realizing negative temperature coefficient, avoid the phenomenon that the equipment load such as LEDs takes place the thermal collapse under low-end voltage or current, and meanwhile, it is different from the fixed parameter current limiting value of constant current diode CCD, its biggest difference is that CCR has Radj pin, through connecting resistance between Radj pin and the cathode, adjust resistance value, it can adjust in a certain range, make it more accurate match the overcurrent protection requirement of small current in the circuit, and simultaneously, it can be used in a specific condition more flexible and more efficient.
As shown in fig. 4, as a preferred embodiment, when the output voltage of ISO-OUT is greater than 5.1v, the output voltage of U1 is low while iso_out_ok1 performs normal indication lighting, and when the output voltage of ISO-OUT is less than 5.1v, the receiving transistor of U1 is turned off while iso_out_ok1 is turned off, and at this time, the GPO11 group policy controller reads the high level, indicating that the output voltage of ISO-OUT is abnormal.
It should be added that when the output voltage of iso_outis greater than 5.1V, D2 breaks down and turns on at this time, then the input diode of U1 emits light, meanwhile the input diode of U1 receives the triode to turn on, the input diode of U1 outputs the low level, at this time iso_outjok 1 emits light normally, GPI1 reads the low level, representing that the output voltage of iso_outis normal;
when ISO_OUT is lower than 5.1V, at this time D2 is cut off, the input light emitting diode of U1 does not emit light, the input diode of U1 is cut off, the 4-pin of U1 is pulled up to high level through R3 and ISO_OUT_OK1, ISO_OK1 is extinguished, GPI1 reads high level, representing that ISO_OUT output voltage is abnormal.
It is worth supplementing that when the load current is smaller than 80mA, ISO_OUT can meet the actual power supply current value of the load, the voltage drop on D1 increases along with the increase of the current value, and some voltage drop is generated, but the expanded external connection equipment is generally designed for wide-voltage input, so that normal use is not affected;
it should be noted that, when the load current is greater than or equal to 80mA, D1 limits the load current to 80mA at maximum, prevents the output of M1 from being damaged due to the increase of the peripheral current, when the voltage drop of D1 is 7.5V, then the voltage obtained by iso_out is 12V-7.5v=4.5v < 5.1v threshold value, when D2 is cut off, the input light emitting diode of U1 does not emit light, the receiving triode of U1 is cut off, the 4 pin of U1 is pulled up to high level through R3 and iso_out_ok1, iso_out_ok1 is extinguished, GPI1 reads to high level, when the MCU can obtain the output voltage drop of iso_out, the output overcurrent state of the peripheral is judged, the full output abnormality of the isolated power module is immediately set low for GPO1, the output of M1 is turned off, and the user is notified for processing by an alarm. The whole process can not cause M1 damage, and overcurrent protection based on the adjustable constant current voltage stabilizer CCR is realized.
When the overcurrent protection circuit based on the adjustable constant current voltage stabilizer CCR works, firstly, the 5.0v power supply voltage device outputs voltage, the output voltage end of the 5.0v power supply voltage device is connected with the wire grounding end through each shunt branch, the grounding port of the 5.0v power supply voltage device is connected with the wire grounding end, meanwhile, the 5.0v power supply voltage device has the characteristic of outputting constant voltage and has the characteristic that the output current is equal to the input current, all devices are initialized at the moment, when the GPO1 program controller is in a high position, the ISO_OUT outputs at the moment, if GPI1 is detected to be too high, the ISO_OUT outputs overcurrent protection at the moment, when GP01 is in a low position, the ISO-OUT outputs protection is closed, and the user is warned by suspending through an indicating lamp to be informed of the warning for processing;
when detecting that GPI1 is in the low position, the ISO-OUT outputs normally;
when the output voltage of the ISO-OUT is larger than 5.1v, the output voltage of the U1 is equal to the output voltage of the ISO_OUT_OK1 and the ISO-OUT is normal to instruct to emit light, when the output voltage of the ISO-OUT is smaller than 5.1v, the receiving triode of the U1 is cut off and the ISO_OUT_OK1 is extinguished, and at the moment, the GPO11 group strategy controller reads the high level to indicate that the output voltage of the ISO-OUT is abnormal;
when the output voltage of the ISO_OUT is larger than 5.1V, D2 breaks down and turns on, the input diode of U1 emits light immediately, meanwhile, the input diode of U1 receives the triode to turn on, the input diode of U1 outputs a low level, at this time, the ISO_OUT_OK1 emits light normally, GPI1 reads the low level, and the output voltage of the ISO_OUT is normal;
when the load current is smaller than 80mA, ISO_OUT can meet the actual power supply current value of the load, the voltage drop on D1 increases along with the increase of the current value, and some voltage drop is generated, but the expanded external connection equipment is generally designed for wide-voltage input, so that normal use is not influenced;
when the load current is greater than or equal to 80mA, D1 limits the load current to 80mA at maximum, M1 output overcurrent damage caused by the increase of peripheral current is prevented, D1 voltage drop is 7.5V at this moment, then the voltage 12V-7.5V=4.5V < 5.1V threshold value obtained by ISO_OUT, D2 is cut off, the input light-emitting diode of U1 does not emit light, the receiving triode of U1 is cut off, the 4 pin of U1 is pulled up to high level through R3 and ISO_OUT_OK1, ISO_OUT_OK1 is extinguished, GPI1 reads high level, MCU can obtain ISO_OUT output voltage drop at this moment, the state of peripheral output overcurrent is judged, GPO1 is immediately set low, the output of M1 is closed, and the user is informed to process in an alarm. The whole process can not cause M1 damage, and overcurrent protection based on the adjustable constant current voltage stabilizer CCR is realized.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. An overcurrent protection circuit based on an adjustable constant current voltage stabilizer CCR is characterized in that: the constant current voltage stabilizing circuit comprises N adjustable constant current voltage stabilizing branches, wherein the input end of each adjustable constant current voltage stabilizing branch is connected with the output end of a driving circuit to be tested, N is a positive integer, and the adjustable constant current voltage stabilizing branch comprises:
the MCU micro-control unit is internally provided with a 5.0v power supply voltage device, a GPO1 program controller, a GPO11 group strategy controller, an electric wire grounding end, an output socket P1, voltage stabilizing tubes R2, D2 and U1 optocouplers, R3 and ISO_OUT_OK1;
the GPO1 program controller is connected with a power triode and a field effect tube, the power triode and the field effect tube form an electronic enabling switch, the power triode and the field effect tube are connected with an ISO-OUT, and the ISO-OUT is used for outputting voltage;
the power triode is connected with an input filter device and an output filter capacitor;
the field effect tube is connected with a voltage stabilizing tube and an input light emitting diode.
2. The overcurrent protection circuit based on the adjustable constant current voltage stabilizer CCR according to claim 1, wherein: the input filter component consists of L1, C3 and C4, wherein L1, C3 and C4 are input filter components of a transformer and are used for smoothing and filtering input voltage.
3. The overcurrent protection circuit based on the adjustable constant current voltage stabilizer CCR according to claim 1, wherein: the output filter capacitor consists of C1 and C2, and the C1 and C2 are output filter flashlights of the isolation transformer, and are used for smoothing filter output voltage.
4. The overcurrent protection circuit based on the adjustable constant current voltage stabilizer CCR according to claim 1, wherein: the output socket P1 is an output socket part for isolating a power supply, and is used for stably supplying power to a circuit by externally connecting an extension external device.
5. The overcurrent protection circuit based on the adjustable constant current voltage stabilizer CCR according to claim 1, wherein: the R2 and D2 voltage stabilizing tubes and the input light emitting diode of the U1 optocoupler form a threshold voltage detection circuit which can be used for feeding back the state of the output voltage ISO-OUT and feeding back the state to the MCU micro control unit for the MCU micro control unit to receive and process.
6. The overcurrent protection circuit based on the adjustable constant current voltage stabilizer CCR according to claim 1, wherein: the R3 and the ISO_OUT_OK1 are pull-up circuits of the GPO11 group strategy controller, and the ISO_OUT_OK1 is used for indicating lamps for threshold voltage detection.
7. The overcurrent protection circuit based on the adjustable constant current voltage stabilizer CCR according to claim 1, wherein: when the output voltage of the ISO-OUT is larger than 5.1v, the output voltage of the U1 is equal to the output voltage of the ISO-OUT_OK1, normal indication luminescence is carried OUT, when the output voltage of the ISO-OUT is smaller than 5.1v, the receiving triode of the U1 is cut off, the output voltage of the ISO-OUT_OK1 is extinguished, and at the moment, the GPO11 group strategy controller reads the high level, so that the output voltage of the ISO-OUT is abnormal.
CN202311347660.2A 2023-10-18 2023-10-18 Overcurrent protection circuit based on adjustable constant current voltage stabilizer CCR Pending CN117394292A (en)

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Application Number Priority Date Filing Date Title
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104185333A (en) * 2013-05-20 2014-12-03 海洋王(东莞)照明科技有限公司 Constant-current constant-voltage circuit and illuminating device
CN106100378A (en) * 2016-07-11 2016-11-09 华南理工大学 A kind of wide scope input, the flyback power supply of Multiple isolated outputs
CN109152125A (en) * 2017-06-28 2019-01-04 群光电能科技股份有限公司 Light emitting device and its driving method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104185333A (en) * 2013-05-20 2014-12-03 海洋王(东莞)照明科技有限公司 Constant-current constant-voltage circuit and illuminating device
CN106100378A (en) * 2016-07-11 2016-11-09 华南理工大学 A kind of wide scope input, the flyback power supply of Multiple isolated outputs
CN109152125A (en) * 2017-06-28 2019-01-04 群光电能科技股份有限公司 Light emitting device and its driving method

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