CN114414879A - Overcurrent detection system, method and device - Google Patents
Overcurrent detection system, method and device Download PDFInfo
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- CN114414879A CN114414879A CN202210321805.0A CN202210321805A CN114414879A CN 114414879 A CN114414879 A CN 114414879A CN 202210321805 A CN202210321805 A CN 202210321805A CN 114414879 A CN114414879 A CN 114414879A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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Abstract
The invention relates to an overcurrent detection system, method and device, the system includes collector, optical coupling isolator, and comparator, the comparator couples with collector through the optical coupling isolator; the collector is configured to collect a signal to be detected output by the target circuit; wherein, the signal to be detected is an electric signal; the optical coupler isolator comprises a light-emitting element and a sensing element, wherein the light-emitting element is configured to receive a signal to be detected and generate a light sensation signal, and the sensing element is configured to receive the light sensation signal and generate a sensing signal; the light sensing signal is an optical signal, and the sensing signal is an electrical signal; the comparator is configured to receive the sensing signal, compare the strength of the sensing signal with a preset reference strength signal, and output a detection result. Compared with the prior art, the optical isolator has the advantages that the optical isolator is introduced to isolate a detection circuit (namely a system or a device) from a target circuit so as to reduce signal interference generated by direct access and ensure that the target circuit works stably.
Description
Technical Field
The present invention relates generally to the field of circuit detection and circuit control, and more particularly to an over-current detection system, method and apparatus.
Background
With the development of economy, social progress and increased competition, more and more people hope to change their own images through medical cosmetology, gain advantages in various aspects of life such as study, job hunting, work, marital and social contact, improve their quality of life and even change their lives. Therefore, the number of people who want to receive medical care and beauty is increasing, and the population is also expanding. As with other medical instruments, the beauty treatment instrument as one of the medical instruments relates to a plurality of industries such as medicine, machinery, electronics, plastics and the like, and is a high-tech industry with interdisciplinary multiple disciplines, intensive knowledge and intensive funds. With the increasing demand of beauty-seeking people and patients, intelligent and automatic new percutaneous administration technology, such as an electron beam water light technology, gradually appears, and compared with the conventional injection with a needle water light injection, the percutaneous administration technology can effectively relieve pain, shorten the injection time and reduce the medicine waste.
The technical principle of the electric beam water light is as follows: by applying an electrical current to the skin, the keratinous structure is altered, creating reversible hydrophilic "electrical pathways" to increase the transdermal permeability of macromolecular drugs. Since the electric beam water light device applies high voltage pulse to human skin, it is required to have stable and controllable output limit or protection control of overcurrent and overvoltage. In general, a detection circuit with a comparator is introduced into a system of electric beam water light and forms closed-loop control with an original system (i.e., a detected circuit, a protected circuit or a target circuit), thereby controlling the output of a high-voltage pulse.
However, the direct connection of the detection circuit to the target circuit is liable to generate signal interference to the target circuit, which affects the normal operation of the target circuit, so that such control can only satisfy the overcurrent and overvoltage protection or controllable output, but cannot satisfy the stable requirement.
Disclosure of Invention
The present invention has been made in view of the above-mentioned conventional circumstances, and an object thereof is to provide an overcurrent detection system, method, and apparatus. The optical coupler is used as a core to optically isolate the target circuit and the detection circuit to form electrical isolation, and can reduce signal interference caused when the detection circuit is directly connected to the target circuit, thereby meeting the requirements that the electric beam water-light equipment has an overcurrent detection function and can stably work.
A first aspect of the invention provides an over-current detection system.
Optionally, the system according to the present invention includes a collector, an optical coupler isolator, and a comparator, where the comparator is coupled to the collector through the optical coupler isolator: the collector is configured to collect a signal to be detected output by the target circuit; wherein the signal to be detected is an electric signal; the optical coupler isolator comprises a light-emitting element and a sensing element, wherein the light-emitting element is configured to receive the signal to be detected and generate a light sense signal, and the sensing element is configured to receive the light sense signal and generate a sensing signal; the light sensing signal is an optical signal, and the sensing signal is an electrical signal; the comparator is configured to receive the sensing signal, compare the strength of the sensing signal with a preset reference strength signal, and output a detection result.
Under the condition, the collector, the optical coupling isolator and the comparator can be connected with the control circuit or the target circuit to form a closed-loop control system with overcurrent protection, and meanwhile, the optical coupling isolator module is used, so that the original electric signal can be transmitted to the detection circuit in an optical form to complete electric isolation, and the signal interference caused by the fact that the detection circuit is directly connected with the target circuit is reduced.
According to the system of the present invention, optionally, the sensing element is a photosensitive element, the photosensitive element receives the light sensing signal and generates a sensing signal based on the light signal, and the intensity of the sensing signal is proportional to the intensity of the light signal.
In this case, the original electrical signal can be optically transmitted in the optocoupler isolator by the photosensitive element to form an electrical isolation.
According to the system of the present invention, optionally, the system further comprises a signal input component for providing the reference intensity signal, the signal input component comprises a voltage source, a voltage control resistor, and a voltage regulator, the voltage source output voltage forms a preset intensity signal through the voltage control resistor, the reference intensity signal is formed through the voltage regulator, and the reference intensity signal is output to the comparator.
In this case, the signal input component can provide a reference strength signal to the comparator, and the comparator can determine whether the sensing signal is greater than the reference strength signal through comparison between the reference strength signal and the received sensing signal, so as to output a detection result.
According to the system of the present invention, optionally, the comparator outputs a warning when the intensity of the sensing signal is greater than the reference intensity signal.
In this case, when the detection result is a warning, the controller or the operator can perform corresponding operation on the target circuit through the warning information to prevent the target circuit from causing overcurrent damage.
According to the system of the present invention, optionally, the comparator outputs a normal detection result when the intensity of the sensing signal is not greater than the reference intensity signal.
In this case, when the detection result is normal, the controller or the operator can perform corresponding operation on the target circuit or maintain the current working state through the detection result so that the target circuit works normally.
According to the system of the present invention, optionally, the system further comprises a controller configured to determine a type of the detection result, and output a stop signal to the target circuit when the detection result is a warning.
In this case, the controller outputs a stop signal to the target circuit, that is, when the electric signal of the target circuit is greater than the reference intensity signal, the target circuit can be stopped to prevent the human body from being damaged by overcurrent.
According to the system related to the present invention, optionally, the system further comprises a filtering component, wherein the filtering component is disposed between the optical coupling isolator and the comparator; the filtering component comprises a filtering resistor and a filtering capacitor, and the sensing signal is subjected to integral filtering and then output to the comparator.
In this case, the filter component can fit and filter the high-frequency clutter present in the sensing signal, and thus the sensing signal can be better input to the comparator to reduce the high-frequency interference.
According to the system related to the present invention, optionally, the comparator further includes a state display component, and the state display component is electrically connected to the output end of the comparator and is configured to display the detection result.
Under the condition, the state display assembly can clearly display the detection result for the operator to conveniently further operate, and the visualization of the system can be improved.
A second aspect of the present invention provides an overcurrent detection method.
According to the method of the invention, optionally, the method comprises: collecting a signal to be detected, wherein the signal to be detected is an electric signal output by a target circuit; converting the signal to be detected into an induction signal according to a light sensation signal generated by the signal to be detected; the light sensing signal is an optical signal, and the sensing signal is an electrical signal; and comparing the intensity of the induction signal with a preset reference intensity signal, and outputting a detection result.
In this case, the signal to be detected is optically converted into an inductive signal and compared with a preset reference intensity signal to obtain a detection result, the signal to be detected can be electrically isolated when being input to the detection circuit or system by being optically converted into the inductive signal, and whether the target circuit is over-current or not can be detected by comparing the inductive signal with the preset reference intensity signal, so that over-current detection and protection can be performed on the target circuit.
According to the method of the present invention, optionally, if the detection result is a warning, a stop signal is output to the target circuit.
In this case, damage to a human body due to overcurrent is prevented by detecting overcurrent of the target circuit and outputting a stop signal to the target circuit when the target circuit is overcurrent to stop the target circuit.
According to the method of the present invention, optionally, before comparing the strength of the sensing signal with a preset reference strength signal, the method further includes: and carrying out integral filtering processing on the induction signal.
In this case, high-frequency noise present in the induced signal is integrated and filtered, whereby high-frequency interference can be reduced.
A third aspect of the invention provides an overcurrent detecting apparatus.
The apparatus according to the present invention optionally comprises: the acquisition module is used for acquiring a signal to be detected, wherein the signal to be detected is an electric signal output by a target circuit; the optical coupling module is used for converting the signal to be detected into an induction signal according to a light sensation signal generated by the signal to be detected; the light sensing signal is an optical signal, and the sensing signal is an electrical signal; and the comparison module is used for comparing the intensity of the induction signal with a preset reference intensity and outputting a detection result.
In this case, an acquisition module, an optical coupling module, and a comparison module are provided, which can optically transmit and compare the output signal of the target circuit, thereby satisfying the purpose of overcurrent detection and reducing signal interference when the target circuit and the detection device are directly input.
According to the device of the present invention, optionally, the device further comprises a control module, wherein the control module is configured to determine a type of the detection result, and output a stop signal to the target circuit if the detection result is a warning.
In this case, the control module can determine the overcurrent detection result and output a stop signal to the target circuit to stop the target circuit when the target circuit is overcurrent, thereby performing overcurrent protection on the target circuit.
Optionally, the apparatus according to the present invention further includes a filtering module, where the filtering module is configured to receive the sensing signal, perform integral filtering on the sensing signal, and send the integrated filtered sensing signal to the comparing module.
In this case, the filtering module can integrate and filter the high-frequency noise present in the induced signal, thereby reducing the high-frequency interference when the induced signal is input to the comparing module.
According to the overcurrent detection system, the method and the device, the target circuit and the detection circuit are optically isolated by taking the optocoupler as a core to form electrical isolation, signal interference caused when the detection circuit is directly connected to the target circuit can be reduced, and the requirements of the electric beam water-light equipment on overcurrent protection and stable work are met.
Drawings
The invention will now be explained in further detail by way of example only with reference to the accompanying drawings.
Fig. 1 is a system block diagram showing an overcurrent detection system according to the present invention.
Fig. 2 is a block diagram showing the structure of the optical coupler isolator according to the present invention.
Fig. 3 is a schematic diagram illustrating the operating principle of the overcurrent detection system according to the present invention.
Fig. 4 is a system block diagram illustrating another embodiment of an over-current detection system in accordance with the present invention.
Fig. 5 is a flowchart illustrating an overcurrent detection method according to the present invention.
Fig. 6 is a flowchart illustrating another embodiment of an over-current detection method according to the present invention.
Fig. 7 is a block diagram showing the structure of an overcurrent detecting apparatus according to the present invention.
Fig. 8 is a circuit diagram showing a comparator of an embodiment of the overcurrent detection system according to the present invention.
Fig. 9 is a circuit diagram showing a comparator of the overcurrent detection system according to the present invention.
Fig. 10 is a circuit diagram showing a controller of the overcurrent detection system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first", "second", "third" and "fourth", etc. in the description and claims of the present invention and the above-mentioned drawings are used for distinguishing different objects and are not used for describing a specific order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.
The invention provides an overcurrent detection system, method and device, which optically isolate a target circuit and a detection circuit by taking an optical coupler as a core to form electrical isolation, can reduce signal interference caused when the detection circuit is directly connected into the target circuit, and meet the requirements of electric beam water-optic equipment on overcurrent protection and stable work.
In some examples, the over-current detection system, method and apparatus may also be any electronic device other than and suitable for use with the beam water light device of the present invention, such as various electrotherapy devices, various devices requiring detection and stabilization of operating equipment, and the like.
The present invention will be described in detail below with reference to the accompanying drawings.
A first aspect of the invention provides an over-current detection system 1. For convenience of description, the overcurrent detection system 1 may sometimes be referred to simply as a detection system or system. Fig. 1 is a system block diagram showing an overcurrent detection system 1 according to the present invention; fig. 2 is a block diagram showing the structure of the opto-isolator 12 according to the present invention; fig. 3 is a schematic diagram illustrating the operating principle of the overcurrent detection system 1 according to the present invention; fig. 4 is a system block diagram showing another embodiment of the overcurrent detection system 1 according to the present invention.
In some examples, as shown in fig. 1, the overcurrent detection system 1 may include a collector 11, an optical coupler isolator 12, and a comparator 13, where the comparator 13 and the collector 11 may be coupled through the optical coupler isolator 12; as shown in fig. 3, the collector 11 may be configured to collect the signal to be detected output by the target circuit 10; wherein, the signal to be detected can be an electric signal; the optocoupler isolator 12 may include a light emitting element 121 and a sensing element 122 (see fig. 2), the light emitting element 121 may be configured to receive a signal to be detected and may generate a light sensing signal, and the sensing element 122 may be configured to receive the light sensing signal and may generate a sensing signal; the light sensing signal can be an optical signal, and the sensing signal can be an electrical signal; the comparator 13 may be configured to receive the sensing signal, compare the strength of the sensing signal with a preset reference strength signal, and output a detection result.
In this case, the collector 11, the optical coupler isolator 12 and the comparator 13 can be connected to the control circuit or the target circuit 10 to form a closed-loop control system with overcurrent protection, and meanwhile, the optical coupler isolator 12 can transmit the original electric signal to the detection circuit in an optical form to complete electric isolation, so that signal interference caused by the fact that the detection circuit is directly connected to the target circuit 10 is reduced.
In some examples, the target circuit 10 may be referred to as a detected circuit or a protected circuit.
In some examples, the signal under test output by the target circuit 10 may be an oscillating electrical signal applied to a human body. In other examples, the signal to be measured output by the target circuit 10 may be vibration, cooling or heating, and the current or voltage signal at its input may be used as the input signal of the detection system. In this case, through detecting system, can restrict the output of equipment in the preset within range, from this, can avoid the equipment to overflow the electric current and cause injury, frostbite or scald etc. to the human body when working.
In some examples, the collector 11 may be a plurality of collecting resistors (described later) connected in parallel to an input end of the optical coupling overcurrent module. In some examples, collector 11 may be used to sample voltages. In some examples, the collector 11 may be a plurality of collecting resistors connected in series at an input end of the optical coupling overcurrent module, and may be used for sampling the current. Under the condition, if the power and the resistance of the acquisition resistor are known, the current or the voltage of the input end of the optical coupler isolator 12 can be known according to ohm's law, and therefore the input and output impedance of the detection circuit can be adjusted to guarantee the normal operation of the overcurrent detection system 1.
In some examples, as shown in fig. 4, the overcurrent detection system 1 further includes a signal input assembly 14 for providing a reference intensity signal, the signal input assembly 14 includes a voltage source, a voltage control resistor, and a voltage regulator (described later), the voltage source output voltage forms a preset intensity signal through the voltage control resistor, the reference intensity signal is formed via the voltage regulator, and the reference intensity signal is output to the comparator 13. In this case, the signal input component 14 can provide a reference strength signal to the comparator 13, and the comparator 13 can determine whether the sensing signal is greater than the reference strength signal through comparison between the reference strength signal and the received sensing signal, so as to output a detection result.
In some examples, as shown in fig. 4, the detection system further includes a controller 15, and the controller 15 is configured to determine the kind of the detection result, and output a stop signal to the target circuit 10 when the detection result is a warning. In this case, the controller 15 outputs a stop signal to the target circuit 10, that is, when the target circuit 10 electrical signal is greater than the reference intensity signal, the target circuit 10 can be stopped to prevent the human body from being damaged by the overcurrent.
In some examples, the controller 15 may be any one or combination of a switch circuit, a microcontroller 15, a controller 15, an integrated chip, and the like, which may output a control instruction according to an input signal.
In some examples, as shown in fig. 4, the overcurrent detection system 1 further includes a filtering component 16, where the filtering component 16 is disposed between the optocoupler isolator 12 and the comparator 13; the filter component 16 includes a filter resistor and a filter capacitor (described later), and is configured to integrate and filter the sensing signal and output the sensing signal to the comparator 13. In this case, the filter component 16 can fit and filter the high-frequency noise present in the induced signal, so that the induced signal can be better input to the comparator 13 to reduce the high-frequency interference.
In some examples, the filtering component 16 may provide a plurality of filtering resistances and a plurality of filtering capacitances. In some examples, a filter resistor may be connected in series at the input of the comparator 13 to perform voltage division, and a filter capacitor may be connected in parallel at the input of the comparator 13 and connected to ground to perform filtering. In this case, it is possible to filter unnecessary high-frequency noise in the induced signal and consume an overvoltage when the target circuit 10 is overcurrent, thereby improving the stability of the overcurrent detection system 1.
In some examples, the input of the electrical signal output by the target circuit 10 to the opto-isolator 12 portion and the application to the human body portion may be different. In other examples, the electrical signal output by the target circuit 10 input to the optocoupler isolator 12 portion and the human body portion may be configured to have a ratio. That is, the target circuit 10 needs to configure the collector 11 and then to be connected to the input terminal of the optical coupler isolator 12. In this case, the detection circuit selects the electric signal input to the opto-isolator 12 portion for detection, and can obtain the magnitude of the actual output electric signal of the detected circuit, that is, the target circuit 10, and the range to be limited through calculation, thereby being capable of controlling the detected circuit, that is, the target circuit 10, and reducing the risk of damaging components due to over-current of the detection circuit.
In other examples, the portion of the electrical signal output by the target circuit 10 that is input to the opto-isolator 12 and the portion that acts on the human body may be the same. That is, the target circuit 10 need not be directly implanted into the input of the opto-isolator 12 through the harvester 11.
In some examples, as shown in fig. 2, the optocoupler isolator 12 may include a light emitting element 121, an inductive element 122, a power supply, an output voltage regulator resistor, and a power supply filter capacitor (described later). In some examples, the light emitting element 121 may receive an electrical signal and emit a light beam with a corresponding intensity, the sensing element 122 may receive the light beam and may form a corresponding sensing signal based on the light beam with the corresponding intensity, the output voltage stabilizing resistor may be configured to stabilize a voltage at an output terminal of the optocoupler isolator 12, and the power filter capacitor may be configured to filter a current generated by the first power supply. In this case, the light emitting element 121 and the sensing element 122 of the optical coupler isolator 12 cooperate with each other to optically transmit the electrical signal of the target circuit 10 to the comparator 13, that is, the optical coupler isolator 12 optically generates a corresponding sensing signal and inputs the sensing signal to the comparator 13, so that electrical isolation can be achieved to reduce signal interference generated when the comparator 13 is directly connected to the target circuit 10.
In some examples, the optocoupler isolator 12 may be an optocoupler device of one of a photodiode type, a phototriode type, a photoresistor type, a photothyristor type, a photoelectric darlington type, an integrated circuit type. In this case, different devices may be selected according to different circuit requirements.
In some examples, the light emitting element 121 may be a light emitting diode or other semiconductor light emitting device, such as an infrared light source, a semiconductor light emitting digital tube, or the like. In this case, different light emitting devices may be selected according to different circuit requirements.
In some examples, the sensing element 122 is a photosensitive element that receives the light sensing signal and generates the sensing signal based on the light signal, and the intensity of the sensing signal is proportional to the intensity of the light signal. In this case, the original electrical signal can be optically transmitted in the optocoupler isolator 12 by the light sensitive element to form an electrical isolation.
In some examples, the inductive element 122 may be a photodiode or other photoconductive device, such as a photoresistor, a phototriode, a photothyristor, or the like. In this case, different photoconductive devices may be selected according to different circuit requirements.
In some examples, the optocoupler isolator 12 may not be provided with an output voltage regulator resistor and a power supply filter capacitor. In this case, the use of components can be reduced, and thus, the power consumption of the circuit can be reduced.
In some examples, when the intensity of the sensing signal is greater than the reference intensity signal, the detection result output by the comparator 13 is a warning. In this case, when the detection result is a warning, the controller 15 or the operator can perform corresponding operations on the target circuit 10 through the warning information to prevent the target circuit 10 from causing overcurrent damage.
In some examples, when the intensity of the sensing signal is not greater than the reference intensity signal, the detection result output by the comparator 13 is normal. In this case, when the detection result is normal, the controller 15 or the operator can operate the target circuit 10 accordingly or maintain the current operating state through the detection result so that the target circuit 10 operates normally.
In some examples, the comparator 13 may be a module composed of a circuit having a comparison circuit or an integrated circuit thereof, such as a circuit of an NE555 chip combination. In some examples, the comparator 13 may be a voltage comparator 13. In other examples, the comparator 13 may also be a voltage comparator which is used as an amplifier when no negative feedback is applied, for example, the LM324, LM358, uA741, TL081\ 2\3\4, OP07, OP27, LM339, LM393, etc. can be used as a voltage comparator when no negative feedback is applied.
In some examples, the detection result of the comparator 13 may preferably be one of a maximum input low level or a minimum input high level to cause the controller 15 to control the operation of the target circuit 10, that is, an electric signal when the detection result is warning or normal. In some examples, when the sensing signal is greater than a preset reference strength signal of the input component, the detection result is a warning, and the comparator 13 may output the maximum input low voltage to the controller 15; when the sensing signal is smaller than the predetermined reference strength signal of the input element, the detection result is normal, and the comparator 13 may output a minimum input high level to the controller 15. In this case, the controller 15 obtains the control logic required for overcurrent protection through the maximum input low level or the minimum input high level output by the comparator 13. In this case, the controller 15 can perform current limiting control on the target circuit 10 according to the maximum input low level input by the comparator 13 when the target circuit 10 is over-current to achieve the purpose of over-current protection, and the controller 15 can perform control on the target circuit 10 according to the minimum input high level input by the comparator 13 to maintain the operating state of the target circuit 10 when the target circuit 10 is not over-current.
In other examples, the comparator 13 may also output a minimum input high level to the controller 15 when the sensing signal is greater than the preset reference strength signal of the input component; the comparator 13 may also output a maximum input high level to the controller 15 when the sensing signal is less than the predetermined reference strength signal of the input component. In this case, the controller 15 can also make an adaptive adjustment according to the logic input of the detection result of the comparator 13 and perform a corresponding control of the target circuit 10.
In some examples, the maximum input low level may also be referred to as a low level and a low level, which refers to the maximum input voltage allowed when the input of the logic gate is guaranteed to be a low level, and is generally 0 to 0.3V.
In some examples, the minimum input high level may also be referred to as high level, and refers to the minimum input voltage allowed when the input of the logic gate is guaranteed to be high level, which is generally 3.5 to 5V.
In some examples, the high level and the low level can be customized according to different circuit power supply requirements and the properties of components, for example, in some 10V power supply circuit modules, a voltage of 5-10V can be specified as the high level, and a voltage of 0-2.7V can be specified as the low level.
In some examples, preferably, when the detection result of the comparator 13 received by the controller 15 is a maximum input low level, that is, a warning, the controller 15 may output an off enable signal to stop the operation of the target circuit 10; when the detection result of the comparator 13 received by the controller 15 is the minimum input high level, that is, when the input is normal, the controller 15 may output a sustain enable signal to maintain the target circuit 10 in an operating state. In this case, the overcurrent protection control of the target circuit 10 is completed by the controller 15 issuing a corresponding enable signal according to the detection result of the comparator 13 input by the comparator 13.
In other examples, according to different design requirements, when the detection result of the comparator 13 received by the controller 15 is a maximum input low level, that is, when the input level is normal, the controller 15 may output a sustain enable signal to maintain the target circuit 10 in an operating state; when the detection result of the comparator 13 received by the controller 15 is the minimum input high level, that is, when a warning is issued, the controller 15 may also output an off enable signal to stop the operation of the target circuit 10. In this case, the overcurrent protection control of the target circuit 10 is completed by the controller 15 issuing a corresponding enable signal according to the detection result of the comparator 13 input by the comparator 13.
In some examples, the comparator 13 may further include a status display component 131, and the status display component 131 is electrically connected to an output terminal of the comparator 13 for displaying the detection result. In this case, the status display component 131 can clearly display the detection result for the operator to facilitate further operation, and can improve the visualization of the system.
In some examples, the status display component 131 may be an indication unit element such as a light emitting diode or a buzzer, among others, that is optically or acoustically indicated. In other examples, the status display component 131 may be an element that alerts the user through vibration or other indication methods.
A second aspect of the present invention provides an overcurrent detection method. FIG. 5 is a flow chart illustrating an over-current detection method in accordance with the present invention; fig. 6 is a flowchart illustrating another embodiment of an over-current detection method according to the present invention.
In some examples, as shown in fig. 5, the over-current detection method may include: collecting a signal to be detected (step S100), wherein the signal to be detected is an electric signal output by the target circuit 10; converting the signal to be detected into a sensing signal according to a light sensing signal generated by the signal to be detected (step S200); comparing the intensity of the sensing signal with a preset reference intensity signal, and outputting a detection result (step S300).
In this case, the signal to be detected is optically converted into an inductive signal and compared with a preset reference intensity signal to obtain a detection result, the optical conversion into the inductive signal can electrically isolate the signal to be detected when the signal to be detected is input into the detection circuit or system, and the comparison between the inductive signal and the preset reference intensity signal can detect whether the target circuit 10 is over-current, so that the target circuit 10 can be over-current detected and protected.
In some examples, in step S300, if the detection result is a warning, a stop signal is output to the target circuit 10. In this case, the damage of the human body due to the overcurrent is prevented by detecting the overcurrent of the target circuit 10 and outputting a stop signal to the target circuit 10 when the target circuit 10 is overcurrent to stop the operation of the target circuit 10.
In some examples, before step S300, that is, before comparing the strength of the sensing signal with the preset reference strength signal, the method further includes: and carrying out integral filtering processing on the induction signal. In this case, high-frequency noise present in the induced signal is integrated and filtered, whereby high-frequency interference can be reduced.
In some examples, in step S100, the collecting of the signal to be detected may be collecting a current or voltage signal of the target circuit 10, and shunting, dividing or boosting the detection signal, and after shunting, dividing or boosting, selecting the signal to be detected as an input signal of the next step, that is, step S200. In this case, the divided or divided electrical signal can reduce the damage of the larger input signal to the electronic component, and the boosted electrical signal can amplify the smaller detection signal to satisfy the input as the next step.
In some examples, in step S200, the light sensing signal is an optical signal, the sensing signal is an electrical signal, and the sensing signal may be the same as the input signal to be measured in amplitude, frequency, and the like. In other examples, in step S200, the sensing signal and the amplitude, frequency, etc. of the input signal to be detected may satisfy a certain proportional relationship, and when the next step is still performed through the proportional relationship, that is, step S300, the corresponding detection result is obtained and whether the signal to be detected is over-current is determined.
In some examples, in step S300, the detection result may directly act on the target circuit 10 to achieve control of the target circuit 10. In some examples, the detection results may also be presented by means of visualization.
In some examples, as shown in fig. 6, the over current detection method may further include generating a control signal and controlling the target circuit 10 by combining the detection result with external control information after obtaining the detection result (step S400). For example, when the detection result is normal, the target circuit 10 can be stopped by applying the power-off input control.
In some examples, in step S400, external controls such as input clock control, input start control, forced power-off control, and the like may also be included.
A third aspect of the invention provides an overcurrent detecting apparatus 2. Fig. 7 is a block diagram showing the structure of the overcurrent detecting apparatus 2 according to the present invention.
In some examples, as shown in fig. 7, the over-current detection device 2 may include: the acquisition module 21 is configured to acquire a signal to be detected, where the signal to be detected is an electrical signal output by the target circuit 10; the optical coupling module 22 is used for converting the signal to be detected into an induction signal according to a light sensation signal generated by the signal to be detected; the light sensing signal is an optical signal, and the sensing signal is an electrical signal; and the comparison module 23 is configured to compare the intensity of the sensing signal with a preset reference intensity, and output a detection result. In this case, the acquisition module 21, the optical coupling module 22, and the comparison module 23 can optically transmit and compare the output signal of the target circuit 10, thereby satisfying the purpose of overcurrent detection and reducing signal interference when the target circuit 10 and the detection device are directly input.
In some examples, as shown in fig. 7, the over-current detection device 2 further includes a control module 25, and the control module 25 is configured to determine a type of the detection result, and output a stop signal to the target circuit 10 if the detection result is a warning. In this case, the control module 25 can determine the overcurrent detection result and output a stop signal to the target circuit 10 to stop the operation of the target circuit 10 when the target circuit 10 is overcurrent, thereby performing overcurrent protection on the target circuit 10.
In some examples, as shown in fig. 7, the over-current detection device 2 further includes a filtering module 26, and the filtering module 26 may be configured to receive the sensing signal, integrate and filter the sensing signal, and send the sensing signal to the comparing module 23. In this case, the filtering block 26 can integrate and filter the high-frequency noise present in the induced signal, thereby reducing the high-frequency interference when the induced signal is input to the comparing block 23.
In some examples, as shown in fig. 7, the over-current detection device 2 further includes a signal input module 24, and the signal input module 24 is configured to provide a preset reference strength signal to the comparison module 23.
Fig. 8 is a circuit diagram showing the comparator 13 of the embodiment of the overcurrent detection system 1 according to the present invention; fig. 9 is a circuit diagram showing the comparator 13 of the overcurrent detection system 1 according to the present invention; fig. 10 is a circuit diagram showing the controller 15 of the overcurrent detection system 1 according to the present invention. The following description is of the general circuit configuration and functional effects of the system, method and apparatus of the present invention in terms of preferred embodiments. However, it should be noted that the present embodiment is only used for explaining one embodiment of the present invention, and does not limit other contents of the present invention.
As shown in fig. 8, a target circuit 10, which can generate a signal of an oscillating micro-current acting on a human body and obtain an electrical signal to be input to the optical coupler isolator 12 via the collector 11, wherein resistors R1, R2, and R3 (i.e., the aforementioned collecting resistors) of the collector 11 are connected in parallel with a voltage dividing resistor R4 at an input end of the optical coupler isolator 12, and the electrical signal thus obtained is a voltage signal and serves as an input signal of the optical coupler isolator 12; in the optocoupler isolator 12, an input voltage signal passes through an optocoupler U1 (which may include a light emitting diode and a photodiode, that is, the light emitting element 121 and the sensing element 122) to generate a matched sensing signal, and is input to the filtering component 16 through an output end; in the optocoupler isolator 12, the capacitor C1 may be connected in parallel with the power supply of the photodiode to filter the power supply of the photodiode, that is, C1 is a filter capacitor of the aforementioned power supply, and the resistors R5 and R6 are connected in parallel with the output end of the photodiode to be used as a voltage stabilizing resistor of the output end, that is, the aforementioned output voltage stabilizing resistor.
As shown in fig. 8 or 9, the sensing signal input by the optocoupler isolator 12 is filtered by the filter component 16 and then output to the comparator 13 for detection and comparison, in the filter component 16, the resistor R7 plays a role of reducing voltage, that is, the filter resistor, and the capacitor C2 plays a role of filtering a peak value or a trough value in the sensing signal, that is, the filter capacitor; as shown in fig. 9, a1 is a chip having a single comparator 13 or amplifier, a zener diode U3 (i.e., the aforementioned voltage regulator), resistors R10, R11, R12 (i.e., the aforementioned voltage control resistor), a capacitor C5 (which may also be included in the comparator 13), and a voltage source may form a control voltage input terminal CON of a1, that is, the signal input component 14, the resistor R9 and the power supply set the low trigger terminal TRI of a1 to a high level, the resistor R8, the capacitor C4, and the power supply form a reset input terminal RST of a1, the capacitors C3 and C6 may be used as bypass filter capacitors for power supply filtering, the power supply terminal VCC is connected to the power supply, the ground terminal GND, and the discharge terminal DIS is floating. Therefore, the sensing signal filtered by the filtering component 16 is connected to the high trigger terminal THR of the a1, when the sensing signal is higher than the control voltage, the output terminal OUT of the a1 outputs a warning signal (low level signal) to the controller 15, and the status display component 131 (including the power supply, the resistor R13 and the light emitting diode) indicates warning by emitting light, that is, the system detects that the target circuit 10 is over-current; on the contrary, when the sensing signal is lower than the control voltage, the output terminal of a1 outputs a normal signal (high level signal) to the controller 15, and the status displaying component 131 does not emit light, i.e. normal status.
As shown in fig. 8 or 10, in the controller 15, U2 is a micro-control chip, the external enable input terminal (i.e., diode D1), transistor Q1, resistors R17, R14, R19, power supply and forced power-off input terminal inport _ CU, transistor Q3, and resistor R15 form the input enable terminal a of the chip U2, the detection result input terminal, transistor Q2, resistors R18, R16, and power supply form the enable input terminal B of the chip U2, the clock signal input terminal CLK _ CU can input a clock signal to the input terminal a and the input terminal B of the U2, VCC is connected to the power supply terminal, and GND is connected to ground. Thus, the external enable input may enable the controller 15 and prevent current from flowing back; the forced power-off input can forcibly power off the chip U2 and stop the whole machine; when the detection result is inputted with a low level, i.e., a warning, the chip U2 outputs a disconnection enable signal to the target circuit 10 and stops its operation, and when the detection result is inputted with a high level, i.e., a normal state, the chip U2 outputs a sustain enable signal to the target circuit 10 and maintains its current operation state. In some examples, the high and low levels of the detection result may be converted to each other to represent a warning or normal signal, i.e., the low level may be normal and the high level may be warning.
According to the overcurrent detection system, the method and the device, the target circuit and the detection circuit are optically isolated by taking the optical coupler as a core to form an electrical isolation system, signal interference caused when the detection circuit is directly connected to the target circuit can be reduced, and the requirements of the electric beam water-optic equipment on overcurrent protection and stable work are met.
While the invention has been described in detail in connection with the drawings and examples, it is to be understood that the above description is not intended to limit the invention in any way. Those skilled in the art can make modifications and variations of the present invention as needed without departing from the true spirit and scope of the invention, and such modifications and variations are within the scope of the invention.
Claims (10)
1. The utility model provides an overcurrent detection system which characterized in that, includes collector, opto-isolator and comparator, the comparator with the collector passes through opto-isolator coupling: the collector is configured to collect a signal to be detected output by the target circuit; wherein the signal to be detected is an electric signal; the optical coupler isolator comprises a light-emitting element and a sensing element, wherein the light-emitting element is configured to receive the signal to be detected and generate a light sense signal, and the sensing element is configured to receive the light sense signal and generate a sensing signal; the light sensing signal is an optical signal, and the sensing signal is an electrical signal; the comparator is configured to receive the sensing signal, compare the strength of the sensing signal with a preset reference strength signal, and output a detection result.
2. The system of claim 1, wherein the sensor is a photosensitive element, the photosensitive element receives the light sensation signal and generates a sensor signal based on the light signal, and the sensor signal has an intensity proportional to the intensity of the light signal.
3. The system of claim 1, further comprising a signal input component for providing the reference intensity signal, the signal input component comprising a voltage source, a voltage-controlled resistor, and a voltage regulator, the voltage source output voltage forming a preset intensity signal through the voltage-controlled resistor, the reference intensity signal being formed via the voltage regulator, the reference intensity signal being output to the comparator.
4. The system of claim 1, wherein the comparator outputs a warning when the strength of the sensing signal is greater than the reference strength signal.
5. The system of claim 1, further comprising a controller configured to determine a kind of the detection result, and output a stop signal to the target circuit when the detection result is a warning.
6. The system of claim 1, further comprising a filtering component disposed between the optocoupler isolator and the comparator; the filtering component comprises a filtering resistor and a filtering capacitor, and the sensing signal is subjected to integral filtering and then output to the comparator.
7. An over-current detection method, comprising: collecting a signal to be detected, wherein the signal to be detected is an electric signal output by a target circuit; converting the signal to be detected into an induction signal according to a light sensation signal generated by the signal to be detected; the light sensing signal is an optical signal, and the sensing signal is an electrical signal; and comparing the intensity of the induction signal with a preset reference intensity signal, and outputting a detection result.
8. The method of claim 7, further comprising: and if the detection result is warning, outputting a stop signal to the target circuit.
9. The method of claim 7, further comprising performing an integral filtering process on the sensing signal before comparing the strength of the sensing signal with a preset reference strength signal.
10. An overcurrent detection apparatus, comprising: the acquisition module is used for acquiring a signal to be detected, wherein the signal to be detected is an electric signal output by a target circuit; the optical coupling module is used for converting the signal to be detected into an induction signal according to a light sensation signal generated by the signal to be detected; the light sensing signal is an optical signal, and the sensing signal is an electrical signal; and the comparison module is used for comparing the strength of the induction signal with a preset reference strength signal and outputting a detection result.
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