CN111337734A - Near-electricity protection circuit and near-electricity protection equipment - Google Patents
Near-electricity protection circuit and near-electricity protection equipment Download PDFInfo
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- CN111337734A CN111337734A CN202010206782.XA CN202010206782A CN111337734A CN 111337734 A CN111337734 A CN 111337734A CN 202010206782 A CN202010206782 A CN 202010206782A CN 111337734 A CN111337734 A CN 111337734A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/145—Indicating the presence of current or voltage
- G01R19/155—Indicating the presence of voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to two or more of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to two or more of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
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Abstract
The application relates to a near-electric protection circuit and a near-electric protection device. The near-electricity protection circuit comprises a near-electricity induction module, a relay module and a safety detection module; the near-electric induction module comprises a field effect tube induction unit and a chip unit. The field effect tube sensing unit is matched with the chip unit to drive the relay module to be switched on or switched off; the relay module can control the connection or disconnection of the safety detection module. The near-electric induction module is matched with the relay module, and the safety detection module can be started when a high-voltage alternating-current signal is detected; and when the safety detection module detects that the living body enters the detection range, the safety detection module gives an alarm. Based on the above, the embodiment of the application can give an alarm when high voltage exists and a living body enters a detection range, is suitable for being arranged on an object, and improves the safety of high-voltage operation; meanwhile, if no living body appears in the detection range under the high-voltage condition, no prompt is needed, unnecessary consumption and message interference are reduced, and the effectiveness of the object in near-electricity protection is improved.
Description
Technical Field
The application relates to the technical field of electric power safety, in particular to a near-electric protection circuit and near-electric protection equipment.
Background
Traditional near-electricity protection products such as near-electricity alarm or near-electricity alarm watches and the like start a buzzer or a light emitting diode to give out sound and light alarm when sensing voltage, and are suitable for being installed on the body of a person. When an operator wears the near-electricity alarm and mistakenly enters a live zone and mistakenly climbs a live pole, the near-electricity alarm can timely send out continuous sound alarm signals to remind the operator to pay attention to danger, and electric shock casualty accidents caused by illusion and error are prevented.
However, in the implementation process, the inventor finds that at least the following problems exist in the conventional technology: under some scenes, the near-electricity safety protection measures are required to be arranged on the object, and the mode of directly alarming when the voltage is sensed is not suitable, namely the current near-electricity protection product cannot meet the requirement of being arranged on the object.
Disclosure of Invention
Therefore, a near-electric protection circuit and a near-electric protection device are needed to solve the problem that the traditional near-electric protection alarm mode is not suitable for being arranged on an object.
In order to achieve the above object, in one aspect, an embodiment of the present application provides a near electric protection circuit, including:
the near-electric induction module comprises a field effect tube induction unit and a chip unit; the control end of the field effect transistor sensing unit is used for realizing conduction or cut-off according to the acquired sensing voltage; the first transmission end of the field effect tube sensing unit is connected with the input end of the chip unit;
the VCC end of the relay module is connected with the output end of the chip unit;
the safety detection module is used for prompting when the fact that the living body enters the detection range is detected; the first power end of the safety detection module is connected with the public end of the relay module, and the second power end of the safety detection module is connected with the contact end of the relay module.
In one embodiment, the near-induction module further comprises: the antenna is used for acquiring induced voltage; the antenna is connected with the control end of the field effect tube sensing unit.
In one embodiment, the near electric protection circuit further comprises a power supply module;
the output end of the power supply module is connected with the input end of the chip unit;
the field effect transistor unit is an N-type MOS transistor; the control end of the field effect tube unit is a grid electrode of an N-type MOS tube, the first transmission end of the field effect tube unit is a source electrode of the N-type MOS tube, and the second transmission end of the field effect tube unit is a drain electrode of the N-type MOS tube;
the drain electrode of the N-type MOS tube is grounded.
In one embodiment, the chip unit is a not gate logic chip.
In one embodiment, the second power terminal of the safety detection module is connected with the normally open contact terminal of the relay module.
In one embodiment, the near electric protection circuit further comprises a resistor connected between the output end of the power supply module and the input end of the chip unit;
the output end of the power supply module is also connected with the VCC end of the chip unit.
In one embodiment, the power module comprises:
a DC power supply unit;
a DC-DC voltage reduction unit; the input end of the DC-DC voltage reduction unit is connected with the DC power supply unit, and the output end of the DC-DC voltage reduction unit is connected with the output end of the power supply module.
In one embodiment, the safety detection module comprises a living body detection unit for detecting whether a living body enters a detection range;
the first electrode of the living body detecting unit is connected with the first power supply terminal of the safety detecting module, and the second electrode of the living body detecting unit is connected with the second power supply terminal of the safety detecting module.
In one embodiment, the living body detecting unit is an infrared radar probe or a microwave radar probe.
On the other hand, the embodiment of the application also provides a near electric protection device, which comprises the near electric protection circuit.
One of the above technical solutions has the following advantages and beneficial effects:
the near-electricity protection circuit comprises a near-electricity induction module, a relay module and a safety detection module; the near-electric induction module comprises a field effect tube induction unit and a chip unit. The field effect tube sensing unit is matched with the chip unit to drive the relay module to be switched on or switched off; the relay module can control the connection or disconnection of the safety detection module. Whether high-voltage alternating current signals exist or not is detected through the near-electric induction module, and then whether the safety detection module operates or not can be controlled through the relay module. The near-electric induction module is matched with the relay module, and the safety detection module can be started when a high-voltage alternating-current signal is detected; and when the safety detection module detects that the living body enters the detection range, the near-electricity alarm prompt is carried out. Based on the above, the embodiment of the application can give an alarm when high voltage exists and a living body enters a detection range, is suitable for being arranged on an object, and improves the safety of high-voltage operation; meanwhile, if no living body appears in the detection range under the high-voltage condition, no prompt is needed, unnecessary consumption and message interference are reduced, and the effectiveness of the object in near-electricity protection is improved.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments of the application, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the subject matter of the present application.
FIG. 1 is a first schematic block diagram of a near electric protection circuit in one embodiment;
FIG. 2 is a second schematic block diagram of a near electric protection circuit in one embodiment;
FIG. 3 is a third schematic block diagram of a near electric protection circuit in one embodiment;
FIG. 4 is a schematic diagram of an embodiment of a DC-DC voltage reduction unit;
FIG. 5 is a schematic diagram of the structure of a near-induction module and a relay module in one embodiment;
fig. 6 is a schematic structural diagram of a relay in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "control terminal," "input terminal," "output terminal," and the like are used herein for illustrative purposes only.
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 application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The installation object of the conventional near-electricity alarm is a person. On a high-voltage test site, sound and light alarm is needed only when high voltage is applied and people invade a test area, and the needs of the scenes for the near-electricity protection function, such as a warning board of high-voltage power equipment, need to be given sound and light alarm only when the equipment has high voltage and people configured with the near-electricity protection equipment approach. Traditional nearly electric protective apparatus can report to the police when sensing high pressure, however can produce invalid warning under the condition that nobody is close, causes the wasting of resources.
In one embodiment, there is provided a near electric protection circuit, as shown in fig. 1, including:
the near-electric induction module comprises a field effect tube induction unit and a chip unit; the control end of the field effect transistor sensing unit is used for realizing conduction or cut-off according to the acquired sensing voltage; the first transmission end of the field effect tube sensing unit is connected with the input end of the chip unit;
the VCC end of the relay module is connected with the output end of the chip unit;
the safety detection module is used for prompting when the fact that the living body enters the detection range is detected; the first power end of the safety detection module is connected with the public end of the relay module, and the second power end of the safety detection module is connected with the contact end of the relay module.
Specifically, the near-electric protection circuit comprises a near-electric induction module, a relay module and a safety detection module. The near-electric induction module is used for driving a driving loop of the relay module to be switched on or switched off according to the induction voltage; the relay module is used for controlling a power supply end of the safety detection module; the safety detection module can be used for detecting whether a living body enters a detection range. For example, the near-electric induction module may drive the driving loop of the relay module to be turned on when acquiring the induction voltage; when a driving loop of the relay module is switched on, the switch is adsorbed, so that a power supply end of the safety detection module is switched on, and the safety detection module is started to operate; when the power end is switched on, the safety detection module detects whether a living body enters the detection range, and when the living body is detected to enter the detection range, the safety detection module gives an alarm.
Specifically, the near-electric induction module comprises a field effect transistor induction unit for acquiring induction voltage and a chip unit for driving the relay module. The control end of the field effect tube sensing unit is used for acquiring sensing voltage; the first transmission end of the field effect tube sensing unit is connected with the input end of the chip unit; the second transmission terminal of the field effect transistor sensing unit can be used for connecting a power supply or ground, and is not particularly limited herein; the induced voltage can be obtained by an induction circuit or an induction module, for example, the antenna induces an alternating voltage of 50Hz (hertz), and the like, and specifically, the induced voltage can be generated by a high-voltage alternating-current signal; based on this, the Field Effect Transistor sensing unit can control the first transmission terminal and the second transmission terminal to be conducted or cut off according to the obtained sensing voltage, and optionally, the Field Effect Transistor may be a P-type MOS Transistor (Metal-Oxide-Semiconductor Field-Effect Transistor) or an N-type MOS Transistor, which is not specifically limited herein; it should be noted that the fet sensing unit can control the input terminal of the chip unit to be connected to a power signal or ground. Furthermore, the chip unit can be used for outputting according to the signal transmitted by the field effect transistor sensing unit so as to drive the relay module to be switched on or switched off; for example, the chip unit may be a logic gate chip, and for example, when the input terminal of the chip unit is connected to a power signal, the relay module is driven to be turned on, or when the input terminal of the chip unit is grounded, the relay module is driven to be turned on, which is not specifically limited herein.
The VCC end of the relay module is connected with the output end of the chip unit; the GND end of the relay module is grounded or connected with the GND end of the chip unit. The driving loop of the relay module mainly comprises a VCC end and a GND end; when the VCC end obtains a high level signal, the driving loop is conducted; when the VCC end obtains the low level signal, the driving loop is disconnected. The public end of the relay module is connected with a first power supply end of the safety detection module; the contact end of the relay module is connected with a second power supply end of the safety detection module; the contact end may be a normally open contact end or a normally closed contact end of the relay module, which is not limited herein. The safety detection module may detect whether a living body enters a detection range by means of infrared or microwave, for example, a human body proximity sensor, an infrared detection probe, a microwave detection probe, or the like, which is not specifically limited herein; wherein the living body can be human, animal, etc.; the detection range can be realized by arranging corresponding devices or circuits according to actual requirements. When the safety detection module detects that the living body enters the detection range, the safety detection module can give an alarm in the modes of light, a loudspeaker, subtitles, vibration and the like, and the safety detection module is not specifically limited here.
In one example, the second transmission terminal of the fet sensing unit is connected to a power supply, the chip unit may perform not gate logic, and the second power terminal of the safety detection module is connected to the normally closed contact terminal of the relay module. The field effect tube sensing unit is conducted when the sensing voltage is obtained, and the power supply transmits a high-level signal to the input end of the chip unit; the output end of the chip unit outputs a low level signal to drive the relay module to be disconnected, the common end and the normally closed contact end of the relay module are connected, and then the safety detection module is started to operate to detect whether a living body enters a detection range.
In one example, the second transmission terminal of the field effect transistor sensing unit is connected with a power supply; the chip unit can execute AND gate logic, one input end of the chip unit is connected with the first transmission end of the field effect tube sensing unit, and the other input end of the chip unit is connected with a power supply; and a second power supply end of the safety detection module is connected with a normally open contact end of the relay module. The field effect tube sensing unit is conducted when the sensing voltage is obtained, and the power supply transmits high-level signals to two input ends of the chip unit respectively; the output end of the chip unit outputs a high level signal to drive the relay module to be conducted, the public end and the normally open contact end of the relay module are conducted, and then the safety detection module is started to operate to detect whether a living body enters a detection range.
In one example, the second transmission terminal of the field effect transistor sensing unit is connected with a power supply; the chip unit can execute OR gate logic, one input end of the chip unit is connected with the first transmission end of the field effect tube sensing unit, and the other input end of the chip unit is connected with a power supply through a switch circuit; and a second power supply end of the safety detection module is connected with a normally open contact end of the relay module. The field effect tube sensing unit is conducted when the sensing voltage is obtained, and the power supply transmits a high-level signal to the input end of the chip unit; the output end of the chip unit outputs a high level signal to drive the relay module to be conducted, the public end and the normally open contact end of the relay module are conducted, and then the safety detection module is started to operate to detect whether a living body enters a detection range. In addition, the switch circuit can be switched on according to external control, and the power supply transmits a high-level signal to the input end of the chip unit; the output end of the chip unit outputs a high level signal to drive the relay module to be conducted, the public end and the normally open contact end of the relay module are conducted, and then the safety detection module is started to operate to detect whether a living body enters a detection range. Namely, the embodiment of the application can automatically induce the high-voltage alternating-current signal and start the safety detection module, and can also manually start the safety detection module, so that the functionality and the applicability of the circuit are improved.
In one example, the second transmission terminal of the fet sensing unit is grounded; the chip unit can execute NOT gate logic; the input end of the chip unit and the first transmission end of the field effect tube sensing unit are connected with the same power supply; and a second power supply end of the safety detection module is connected with a normally open contact end of the relay module. The field effect tube sensing unit is cut off when the sensing voltage is not acquired, and the power supply transmits a high level signal to the input end of the chip unit; the output end of the chip unit outputs a low level signal to drive the relay module to be disconnected, the common end and the normally closed contact end of the relay module are connected, and then the safety detection module is powered off and stops running. The field effect tube sensing unit is conducted when the sensing voltage is obtained, and the input end of the chip unit obtains a low level signal; the output end of the chip unit outputs a high level signal to drive the relay module to be conducted, the public end and the normally open contact end of the relay module are conducted, and then the safety detection module is started to operate to detect whether a living body enters a detection range.
In one example, the second transmission terminal of the fet sensing unit is grounded; the chip unit can execute NOT gate logic; the input end of the chip unit and the first transmission end of the field effect tube sensing unit are connected with the same power supply; and a second power supply end of the safety detection module is connected with the normally closed contact end of the relay module. The field effect tube sensing unit is conducted when the sensing voltage is not obtained, and the input end of the chip unit obtains a low level signal; the output end of the chip unit outputs a high level signal to drive the relay module to be conducted, the common end and the normally open contact end of the relay module are conducted, and the safety detection module is powered off and stops running. The field effect tube sensing unit is cut off when the sensing voltage is obtained, and the power supply transmits a high level signal to the input end of the chip unit; the output end of the chip unit outputs a low level signal to drive the relay module to be disconnected, the common end and the normally closed contact end of the relay module are connected, and then the safety detection module is connected to operate to detect whether a living body enters a detection range.
In one example, the near-electric induction module drives the relay to automatically pull in after inducing high voltage, and the normally open contact end and the common end contact of the relay are closed and conducted; and a normally open contact end of the relay and a power supply loop of the safety detection module in series connection with the common end contact, such as a power supply loop of an infrared radar probe or a microwave radar probe, realize the starting operation of the safety detection module.
According to the embodiment of the application, whether a high-voltage alternating current signal exists or not is detected through the near-electric induction module, and then whether the safety detection module operates or not is controlled through the relay module. The near-electric induction module is matched with the relay module, and the safety detection module can be started when a high-voltage alternating-current signal is detected; and when the safety detection module detects that the living body enters the detection range, the near-electricity alarm prompt is carried out. If the high-voltage alternating current signal is not detected, the safety detection module does not need to be started, and energy consumption is reduced. Based on the above, the embodiment of the application can give an alarm when high voltage exists and a living body enters a detection range, is suitable for being arranged on an object, and improves the safety of high-voltage operation; meanwhile, if high voltage exists but no living body appears in the detection range, prompting is not needed, unnecessary consumption and message interference are reduced, and the effectiveness of near-electricity protection of the object is improved. The safety detection module is matched with the near-electric induction module, so that equipment applied to the circuit has a near-electric protection function and a safety detection function, the safety protection condition can be screened for the second time, and the safety detection module is particularly suitable for the condition that safety measures are required to be installed on an object.
The traditional relay control circuit and the relay have the safety protection function, but the function is not related to the near-electricity protection. The relay is selected for near-electricity protection, the range of applicable objects is wide, and the relay can be mounted on various objects needing near-electricity protection measures, such as a high-voltage power equipment warning board, a high-voltage test warning board and the like.
In one embodiment, as shown in fig. 2, the near-induction module further comprises: the antenna is used for acquiring induced voltage; the antenna is connected with the control end of the field effect tube sensing unit.
Specifically, the near-electric induction module further comprises an antenna connected with the control end of the field effect tube induction unit. The antenna is used for acquiring the induction voltage and transmitting the induction voltage to the control end of the field effect transistor induction unit. The specific antenna type and parameters may be set according to the actually set object and application environment, and are not limited in detail here.
In one embodiment, as shown in fig. 3, the near electric protection circuit further includes a power supply module;
the output end of the power supply module is connected with the input end of the chip unit;
the field effect transistor unit is an N-type MOS transistor; the control end of the field effect tube unit is a grid electrode of an N-type MOS tube, the first transmission end of the field effect tube unit is a source electrode of the N-type MOS tube, and the second transmission end of the field effect tube unit is a drain electrode of the N-type MOS tube;
the drain electrode of the N-type MOS tube is grounded.
Specifically, the near electric protection circuit further comprises a power supply module which can be used for supplying power to modules and units in the circuit. The field effect transistor unit can be an N-type MOS transistor. Specifically, the grid electrode of the N-type MOS transistor is used for acquiring an induced voltage, for example, the induced voltage is acquired through an antenna; the source electrode of the N-type MOS tube is connected with the input end of the chip unit, and the drain electrode of the N-type MOS tube is grounded; meanwhile, the power module is respectively connected with the input end of the chip unit and the source electrode of the N-type MOS tube. Based on the structure, when no induced voltage exists, the drain-source of the N-type MOS tube is cut off, and the power supply module transmits a high-level signal to the input end of the chip unit; when the induction voltage is obtained, the drain-source of the N-type MOS tube is conducted, and the input end of the chip unit is changed into low level due to the fact that the drain electrode is grounded. Further, a high level signal or a low level signal may be transmitted to the VCC terminal of the relay module through the gate logic of the chip, which is not specifically limited herein. The nearly electric induction module in this application embodiment can mainly adopt power module and N type MOS pipe to realize, and simple structure detects under the high-pressure condition and carries out nearly electric warning suggestion when having the live body to be close to, and nearly electric protective effect is good, can set up on the object that needs nearly electric warning.
Illustratively, after a grid antenna of the field effect tube senses 50Hz alternating voltage, a forward voltage appears once every T/2 period, so that the drain-source of the field effect tube is conducted, after a reverse voltage appears again after the T/2 period, the drain-source of the field effect tube is cut off, and the alternating operation is repeated, so that under the condition that the field effect tube is cut off, a circuit cannot change, but the field effect tube is conducted every T/2 period, because a drain electrode of the field effect tube is connected with a GND (ground) end, the input end of a chip unit is changed from a high level to a low level, after NOT-gate logic conversion of the chip unit, the output end is changed from the low level to the high level, and a relay reaches a working voltage and is attracted.
In one embodiment, the output terminal of the power supply module is further connected to the VCC terminal of the chip unit.
In one embodiment, the drain of the N-type MOS tube is connected with the GND end of the chip unit.
In one embodiment, the GND terminal of the relay module is connected to the GND terminal of the chip unit.
In one embodiment, the chip unit is a not gate logic chip.
In particular, the chip unit may be used to execute not gate logic. Illustratively, when no induced voltage exists, the drain-source of the N-type MOS transistor is cut off, the power supply module transmits a high level signal to the input end of the chip unit, the not gate logic chip performs not gate conversion on the high level and then transmits a low level signal to the VCC end of the relay module through the output end, the drive circuit of the relay module is disconnected, and the normally closed contact end is connected with the common end; when the induction voltage is obtained, the drain-source of the N-type MOS tube is conducted, the drain electrode is grounded, the input end of the NOT gate logic chip is changed into a low level, after the NOT gate logic chip conducts NOT gate conversion on the low level, a high level signal is transmitted to the VCC end of the relay module through the output end, a driving loop of the relay module is conducted, and the normally-open contact end is conducted with the public end. Further, the relay module can control the power supply end of the safety detection module to be switched on or switched off. The nearly electric induction module in this application embodiment can mainly adopt power module, N type MOS pipe and NOT gate logic chip to realize, and simple structure detects under the high pressure condition and carries out nearly electric warning suggestion when having the live body to be close to, and nearly electric guard effect is good, can set up on the object that needs nearly electric warning.
In one embodiment, the second power terminal of the safety detection module is connected to the normally open contact terminal of the relay module.
Specifically, when the VCC end of the relay module receives a high level signal, the normally open contact end is conducted with the public end, the safety detection module starts to operate, and when a living body is detected to enter a detection range, the prompt is carried out. When the VCC end of the relay module receives a low level signal, the normally open contact end is disconnected with the public end, and the safety detection module stops running. According to the embodiment of the application, the normally open contact end and the public end of the relay module are used for controlling the safety detection module to be switched on or switched off, the drive circuit and the safety detection module of the relay module can be switched on when the induction voltage is obtained, the consumption of the circuit is reduced, and the electric energy utilization rate is improved.
In one embodiment, the near electric protection circuit further comprises a resistor connected between the output terminal of the power supply module and the input terminal of the chip unit.
Particularly, the output end of the power supply module is connected with the input end of the chip unit through a resistor, and current can be limited through the resistor, so that the safety of the chip is guaranteed, and the reliability of the circuit is improved.
In one embodiment, a power module includes:
a DC (Direct Current) power supply unit;
a DC-DC voltage reduction unit; the input end of the DC-DC voltage reduction unit is connected with the DC power supply unit, and the output end of the DC-DC voltage reduction unit is connected with the output end of the power supply module.
Specifically, the power module includes a DC power supply unit for supplying a direct current power, and a DC-DC voltage step-down unit for direct current voltage reduction. Specifically, the DC-DC voltage reduction unit may perform voltage reduction processing on the power supplied by the DC power supply unit to obtain the power required by the chip unit. Wherein, the DC power supply unit can be a rechargeable battery or a dry battery, etc.; the voltage of the DC power supply unit and the voltage obtained by the DC-DC voltage reduction unit can be set according to actual requirements, and is not specifically limited herein.
Further, the power module may further include a photovoltaic unit connected to the DC power supply unit. The photovoltaic unit may be used to charge the DC power supply unit.
In one embodiment, the safety detection module includes a living body detection unit for detecting whether a living body enters a detection range;
the first electrode of the living body detecting unit is connected with the first power supply terminal of the safety detecting module, and the second electrode of the living body detecting unit is connected with the second power supply terminal of the safety detecting module.
Specifically, in the safety detection module, the first electrode of the living body detection unit is electrically connected to the common terminal of the relay module, and the second electrode of the living body detection unit is electrically connected to the contact terminal of the relay module. Based on this, relay module's drive circuit can direct control live body detecting element's start or stop, and circuit structure is simple and nearly electric protection is effectual.
In one embodiment, the safety detection module further comprises an acousto-optic alarm unit;
the output end of the living body detection unit is connected with the acousto-optic alarm unit.
Specifically, in the safety detection module, when the living body detection unit detects that a living body enters the detection range, the living body detection unit sends an alarm instruction to the sound and light alarm unit to instruct the sound and light alarm unit to perform alarm prompt.
In one embodiment, the liveness detection unit is an infrared radar probe.
Specifically, the infrared radar probe may detect the presence or movement of a human body through the pyroelectric element and convert an output signal of the pyroelectric element into a voltage signal. Further, the infrared radar probe may also perform waveform analysis on the voltage signal, and output a detection signal only when a waveform generated by a human body is detected through the waveform analysis. For example, once a person enters the detection area, the infrared radiation of the human body is focused through a partial mirror and is received by the pyroelectric elements, but the heat received by the two pyroelectric elements is different, the pyroelectric elements are also different and cannot be offset, and an alarm is triggered through signal processing.
In one embodiment, the liveness detection unit is a microwave radar probe.
Specifically, the microblog radar probe can be a sensor based on the microwave doppler principle, with a planar antenna as the sensing system and a microprocessor as the control. The microwave radar probe has penetrating detection capacity, can be concealed and protected easily, and is not influenced by the ambient temperature.
In one embodiment, the relay module is further provided with a warning light. The prompting lamp can be used for prompting the state of the driving circuit of the relay module.
In one embodiment, as shown in fig. 4 to 6, a 12V (volt) dry cell battery 1, a DC-DC voltage reduction unit 2, a 12V input terminal positive electrode 3, a 12V input terminal negative electrode 4, a 5V output terminal positive electrode 5, a 5V output terminal negative electrode 6, a VCC terminal 7 of a relay K1, a GND terminal 8 of a relay K1, a normally open contact terminal 9 of a relay K1, and a common terminal 10 of a relay K1.
The power module comprises 12V dry batteries 1, and a DC-DC voltage reduction unit 2 for converting 12V into 5V. The positive electrode of the 12V dry battery 1 is connected with the positive electrode 3 of the 12V input end of the DC-DC voltage reduction unit 2; the cathode of the 12V dry battery 1 is connected with the cathode 4 of the 12V input end of the DC-DC voltage reduction unit 2. The positive pole 5 of the 5V output end of the DC-DC voltage reduction unit 2 is connected with the VCC end of the NAND gate logic chip, and the negative pole 6 of the 5V output end of the DC-DC voltage reduction unit 2 is connected with the GND end of the NAND gate logic chip.
The near-induction module comprises a 74HC04PW NOT gate logic chip with the working voltage of 5V, a 5V working power supply of the logic chip is provided by a 12V dry battery 1 after being subjected to voltage reduction through a DC-DC voltage reduction unit 2, and the near-induction module also comprises an N-channel enhancement type MOS (metal oxide semiconductor) transistor and a 1/8W type carbon film resistor.
When the grid antenna of the N-channel enhanced MOS tube has no induced voltage, the drain-source of the N-channel enhanced MOS tube is cut off, a 5V power supply is connected through a 1A input pin of the resistance NAND gate logic chip, a 1A input high level signal is subjected to one-time NOT gate conversion through the chip, and a 1Y output low level signal is obtained.
When the grid electrode antenna of the N-channel enhancement type MOS tube induces 50Hz alternating current voltage, the drain-source of the N-channel enhancement type MOS tube is conducted, the drain electrode of the N-channel enhancement type MOS tube is connected with the GND end, so that the 1A input end is changed from high level to low level, and the 1Y output is changed from low level to high level after passing through the NOT gate logic chip.
Relay K1 is a 5V trigger type relay. The VCC end 7 of the relay K1 is connected with the 1Y output end of the NOT gate logic chip, and the GND end 8 of the relay K1 is connected with the GND end of the NOT gate logic chip; the NOT gate logic chip provides power for the relay K1.
When 1Y outputs high level, the relay K1 is closed, and the normally open contact end 9 of the relay K1 is closed and conducted with the common end 10. Illustratively, if the normally open contact terminal 9 and the common terminal 10 are connected in series with a power supply loop of the microwave radar probe, the microwave radar probe starts to operate.
In one embodiment, a near electric protection device is provided, comprising a near electric protection circuit as described above.
Particularly, the equipment body can be warning sign, warning area, warning section of thick bamboo, isolation frame etc. is equipped with nearly electric protection circuit on the equipment body. Based on the above, the near-electricity protection equipment can be arranged in a high-voltage operation environment, and if a person is detected to enter a detection range under a high-voltage condition, a near-electricity alarm prompt is timely performed, so that the safety of high-voltage operation is improved; meanwhile, if no living body appears in the detection range under the high-voltage condition, no prompt is needed, unnecessary consumption and message interference are reduced, and the effectiveness of the object in near-electricity protection is improved. Promptly, equipment not only can carry out safety inspection, possesses the function of nearly electric induction moreover, and then can just start safety inspection when sensing high-pressure alternating current signal, when guaranteeing the equipment reliability, effectively reduces the consumption of equipment.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A near-electric protection circuit, comprising:
the near-electric induction module comprises a field effect tube induction unit and a chip unit; the control end of the field effect tube sensing unit is used for realizing conduction or cut-off according to the obtained sensing voltage; the first transmission end of the field effect tube sensing unit is connected with the input end of the chip unit;
the VCC end of the relay module is connected with the output end of the chip unit;
the safety detection module is used for prompting when the fact that the living body enters the detection range is detected; the first power end of the safety detection module is connected with the public end of the relay module, and the second power end of the safety detection module is connected with the contact end of the relay module.
2. The near electric protection circuit of claim 1, wherein the near electric induction module further comprises: the antenna is used for acquiring the induction voltage; the antenna is connected with the control end of the field effect tube sensing unit.
3. The near electric protection circuit according to claim 2, further comprising a power supply module;
the output end of the power supply module is connected with the input end of the chip unit;
the field effect transistor unit is an N-type MOS transistor; the control end of the field effect tube unit is the grid electrode of the N-type MOS tube, the first transmission end of the field effect tube unit is the source electrode of the N-type MOS tube, and the second transmission end of the field effect tube unit is the drain electrode of the N-type MOS tube;
and the drain electrode of the N-type MOS tube is grounded.
4. The near electric protection circuit according to claim 3, wherein the chip unit is a NOT gate logic chip.
5. The near electric protection circuit according to claim 4, wherein the second power end of the safety detection module is connected with a normally open contact end of the relay module.
6. The near electric protection circuit according to claim 3, further comprising a resistor connected between an output terminal of the power supply module and an input terminal of the chip unit;
the output end of the power supply module is also connected with the VCC end of the chip unit.
7. The near electric protection circuit according to claim 3, wherein the power supply module comprises:
a DC power supply unit;
a DC-DC voltage reduction unit; the input end of the DC-DC voltage reduction unit is connected with the DC power supply unit, and the output end of the DC-DC voltage reduction unit is connected with the output end of the power supply module.
8. The near electric protection circuit according to any one of claims 1 to 7, wherein the safety detection module includes a living body detection unit for detecting whether a living body enters a detection range;
the first electrode of the living body detecting unit is connected with the first power supply end of the safety detection module, and the second electrode of the living body detecting unit is connected with the second power supply end of the safety detection module.
9. The near electric protection circuit according to claim 8, wherein the living body detection unit is an infrared radar probe or a microwave radar probe.
10. A near electric protection device comprising the near electric protection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010206782.XA CN111337734A (en) | 2020-03-23 | 2020-03-23 | Near-electricity protection circuit and near-electricity protection equipment |
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| CN202010206782.XA CN111337734A (en) | 2020-03-23 | 2020-03-23 | Near-electricity protection circuit and near-electricity protection equipment |
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| CN111337734A true CN111337734A (en) | 2020-06-26 |
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| CN202010206782.XA Pending CN111337734A (en) | 2020-03-23 | 2020-03-23 | Near-electricity protection circuit and near-electricity protection equipment |
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Application publication date: 20200626 |