CN112072626A - Electrostatic protection circuit and wire stripper - Google Patents
Electrostatic protection circuit and wire stripper Download PDFInfo
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- CN112072626A CN112072626A CN202010976542.8A CN202010976542A CN112072626A CN 112072626 A CN112072626 A CN 112072626A CN 202010976542 A CN202010976542 A CN 202010976542A CN 112072626 A CN112072626 A CN 112072626A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
- H02G1/1202—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof by cutting and withdrawing insulation
- H02G1/1248—Machines
- H02G1/1268—Machines the cutting element making a longitudinal in combination with a transverse or a helical cut
Abstract
The invention discloses an electrostatic protection circuit and a wire stripper, and belongs to the technical field of power construction equipment. The electrostatic protection circuit is provided with a first input port and a second input port, is used for inputting external static electricity, and also comprises a front-end absorption circuit, an isolation power supply circuit and a rear-end digital processing circuit; the front-end absorption circuit is used for absorbing external static electricity and converting the external static electricity into common-mode voltage; the isolation power supply circuit is used for isolating the converted common-mode voltage from an external output circuit; the back-end digital processing circuit is used for transmitting the converted common-mode voltage to an external output circuit. The invention can ensure that the static interference between the equipment and the overhead line generated in the rotation process of the wire stripper can be effectively released and isolated, so that the whole equipment can safely and stably operate.
Description
Technical Field
The invention belongs to the technical field of power construction equipment, and particularly relates to an electrostatic protection circuit and a wire stripper.
Background
In order to improve the safety of the overhead distribution line, a power system mostly adopts a cross-linked polyethylene insulated wire. When the distribution line is subjected to the operation of connecting the fire, the wire clamp and the lead wire are often required to be installed after the insulating skin of the insulated wire is stripped to complete the operation of connecting the fire. The domestic live-line connection operation is high-voltage live-line conventional operation and is subjected to four technical stages of insulating gloves, insulating tools, insulating bucket arm vehicles and robots.
The problem that manual live working safety can not be guaranteed is solved in the operation of intelligence wire stripping robot, and operating personnel only need just can peel off the insulating skin of insulated wire at ground control operation robot.
The applicant previously filed an application number 201911401457.2 for a wire stripper and a wire stripping method thereof, the wire stripper is used for dynamically adjusting the angle of a cutter head on a 10KV overhead wire for stripping wires, and belongs to an intelligent wire stripping robot. During actual operation, the overhead wire is clamped between the cutter head of the wire stripper and the lug of the wire clamp module, the wire clamp module moves forwards while rotating, and the cutter head advances in a spiral mode to strip the wire. The detection component comprises two contact bars 204, and the two contact bars 204 are respectively contacted with two points of the lead, as shown in fig. 1 to 3. The two contact strips 204 and the tool bit 301 are respectively connected into the detection circuit, and whether the insulation skin is stripped by the wire stripper or not and whether the tool bit 301 nicks the lead or not are judged according to the change of voltage. If the insulation skin is stripped, the cutter head 301 does not scratch the lead, the cutter head 301 is fixed, and the insulation skin is continuously stripped until the insulation skin is stripped to the preset length; if the insulation skin is not peeled off, the cutter head 301 is pressed down to continue to strip the wire, and then the touch strip 204 is used for detecting whether the insulation skin of the stripped wire is peeled off; if the insulation skin is stripped but the cutter head 301 cuts the wires, the cutter head 301 is lifted to adjust the cutter to continue stripping the wires until the cutter head 301 is detected to strip the insulation skin and the wires are not cut at the same time.
When the wire stripper is used for stripping wires on a 10KV overhead wire, when the cutter head 301 and the contact strip 204 both contact the wire stripper, a current loop (hereinafter referred to as a wire stripper current loop) between the cutter head 301 and the contact strip 204 is in a non-conducting state, and a post-stage circuit outputs high level; in the wire stripping process, when the contact strip 204 contacts the wire core first, if the cutter head 301 also contacts the wire core, a current loop of the wire stripper is caused to form a path, a later-stage circuit outputs a low level, and the wire stripper quickly lifts the cutter at the moment, so that the wire core can be prevented from being damaged.
As the first intelligent wire stripper in the market, the problem that other wire strippers in the market need to be repeatedly debugged and cannot accurately guide the angle and the position of knife adjustment is solved. Meanwhile, due to the fact that electronic devices (the tool bit 301 and the touch strip 204) are added to the wire stripper, in an actual working environment, friction exists between metal and Teflon or between metal and polyethylene wire sheaths in a rotating main body, and charge transfer can occur; along with the friction, and the difference characteristic of the binding capacity of metal and teflon to the electron beam is large, charges can be accumulated slowly until the touch strip touches an overhead wire core, and at the moment, the charges carried by the touch strip can be released instantly, so that electromagnetic radiation is caused to a single plate of the wire stripper, and the running of a single plate CPU (central processing unit) can be interfered; or the accumulated charges form an electrostatic field, and the running stability of the single-board CPU is continuously influenced.
Disclosure of Invention
The invention aims to provide an electrostatic protection circuit and a wire stripper, which can ensure that electrostatic interference between equipment and an overhead line generated in the rotation process of the wire stripper can be effectively released and isolated, so that the whole equipment can safely and stably operate.
Specifically, in one aspect, the present invention provides an electrostatic protection circuit, which is provided with a first input port and a second input port, where the first input port and the second input port are used for inputting external static electricity, and the electrostatic protection circuit further includes a front end absorption circuit, an isolation power supply circuit, and a back end digital processing circuit;
the front-end absorption circuit comprises an absorption element, a decoupling element and a filter element; one end of the absorption element is connected with the first input port, and the other end of the absorption element is connected with the second input port and used for absorbing external static electricity and converting the external static electricity into common-mode voltage; one end of the decoupling element is connected with the absorbing element, and the other end of the decoupling element is connected with the filtering element and is used for blocking electrostatic interference energy; the filter element is used for filtering the interference of the static electricity of ten megahertz level in the unabsorbed static electricity;
the isolation power supply circuit is used for supplying power to the front-end absorption circuit and the rear-end digital processing circuit so as to isolate the converted common-mode voltage from an external output circuit; the isolation power supply circuit comprises an isolation power supply module, a filter capacitor and a first resistor which are connected with the isolation power supply module in parallel; the isolation power supply module can isolate the electrostatic field size exceeding the external static electricity;
and the back-end digital processing circuit is used for transmitting the converted common-mode voltage to an external output circuit.
Furthermore, the first input port is connected with a tool bit of a wire stripper working in a rotating friction mode, the second input port is connected with a contact strip of the wire stripper, the external static electricity is an electrostatic field generated at the tool bit and the contact strip of the wire stripper, and the external output circuit is a wire stripper controller circuit.
Furthermore, the absorption element adopts TVS, the decoupling element adopts magnetic beads, the filter element adopts a capacitor, and the front end absorption circuit includes an absorption element, a first decoupling element, a second decoupling element, a first filter element and a second filter element; one end of the absorption element is connected with the first input port, and the other end of the absorption element is connected with the second input port; one end of the first decoupling element is connected with the first input port, and the other end of the first decoupling element is connected with the first filter element and the second resistor and then connected with the output voltage of the isolation power supply circuit; one end of the second decoupling element is connected with the second input port, and the other end of the second decoupling element is connected with the output ground of the isolation power supply circuit; the two ends of the second filter element are connected with the output voltage of the isolation power supply circuit and the output ground of the isolation power supply circuit.
Furthermore, the isolation power supply module is a push-pull output isolation power supply module or a flyback isolation module.
Furthermore, the rear-end digital processing circuit comprises a comparator and an optical coupler, wherein the comparator is used for comparing a standard voltage with a voltage value of an external electrostatic current loop and outputting the voltage value to the optical coupler; the optical coupler outputs high and low levels to the external output circuit after signal isolation.
Further, the first input port is connected with a tool bit of a wire stripper working in a rotary friction mode, the second input port is connected with a contact strip of the wire stripper, external static is an electrostatic field generated by the tool bit and the contact strip of the wire stripper in a wire stripping process, the external output circuit is a wire stripper controller circuit, the wire stripper is used for stripping a wire skin of an overhead wire, the standard voltage of the comparator is the voltage minimum value of a divider resistor of a resistance detection circuit between the wire skin and the wire core of the overhead wire, and the resistance value of the divider resistor is equal to the minimum resistance between the wire skin and the wire core of the overhead wire.
On the other hand, the invention also provides a wire stripper which comprises the electrostatic protection circuit.
The electrostatic protection circuit has the following beneficial effects:
according to the electrostatic protection circuit, static electricity generated in the wire stripping process enters the electrostatic protection circuit from the contact strip, and electromagnetic field energy is rapidly expanded to the whole single plate through TVS conduction to form common mode interference and reduce differential mode interference; meanwhile, decoupling magnetic beads are added, so that the absorption is closer to the touch strip and the tool bit, and the interference energy of static electricity to a single plate of the wire stripper is reduced; the interference of high-frequency signals in the electrostatic field is filtered by a filter capacitor with higher frequency than the unabsorbed electrostatic field.
The electrostatic protection circuit isolates the common-mode signal through the power isolation module, further reduces the interference of noise caused by an electrostatic field at the port of a current loop of the wire stripper on a main controller of the wire stripper, and ensures that the volume of the electrostatic protection circuit is smaller by selecting the power isolation module for push-pull output.
The static protection circuit of the invention aims at the problems that the resistance value of the shielding layer on the inner layer of the overhead line is not fixed and has no national standard, calculates the corresponding standard voltage of the comparator by using the minimum value of the resistance partial pressure, and outputs high and low levels to the master controller of the wire stripper through the comparator and the optical coupler to carry out state judgment. If it all contacts the sinle silk to measure tool bit and touch strip, the low level of comparator output, the opto-coupler carries out signal isolation, and the output low level controls the tool bit and lifts up, avoids hindering the sinle silk to realize safe closed loop.
Drawings
Fig. 1 is a schematic structural diagram of a wire stripper according to an embodiment of the present invention.
Fig. 2 is a schematic structural internal view of a wire stripper according to an embodiment of the present invention.
Figure 3 is a partial schematic view of the structural bit of the wire stripper of the present invention.
Fig. 4 is a schematic diagram of the relationship between the electrostatic protection circuit and the other parts of the wire stripper according to the embodiment of the present invention.
Fig. 5 is a schematic diagram of an esd protection circuit according to an embodiment of the invention.
Fig. 6 is a schematic diagram of a front-end absorption circuit of an embodiment of the present invention.
Fig. 7 is a schematic diagram of an isolated power supply circuit of an embodiment of the present invention.
Fig. 8 is a schematic diagram of a back-end digital processing circuit of an embodiment of the present invention.
The labels in the figure are: 100-drive module, 200-wire clamp module, 2031-upper clamp block, 2032-lower clamp block, 2034-convex block, 204-touch bar, wire stripping module-300, 301-knife head, VCC 5V-single plate power supply voltage of wire stripper, single plate ground of GND-wire stripper, VCC5V _ P-isolation power supply circuit output voltage, GND _ P isolation power supply circuit output ground, VCC3V 3-optical coupler output voltage is converted into 3.3V voltage, E _ A-knife head and touch bar contact state output level.
Detailed Description
The present invention will be described in further detail with reference to the following examples and the accompanying drawings.
Example 1:
one embodiment of the invention relates to an electrostatic protection circuit and a wire stripper, which are used for ensuring that electrostatic interference between equipment and an overhead line, which is generated by the wire stripper in the rotation process, can be effectively released and isolated.
As shown in fig. 1 to 3, the wire stripper using the electrostatic protection circuit of the present embodiment is used for dynamically adjusting the angle of a tool bit on a 10KV overhead line for stripping the wire, and includes:
the wire clamp module 200 comprises an upper clamping block 2031 and a lower clamping block 2032 for clamping a wire, wherein a plurality of mutually parallel convex blocks 2034 are arranged on the clamping surfaces of the upper clamping block 2031 and the lower clamping block 2032 and are inclined towards the wire and towards the wire inlet direction;
the wire stripping module 300 comprises a tool bit 301 for stripping wires, and the tool bit 301 is parallel to the bump 2034 on the horizontal plane; the tool tip position of the tool bit 301 is located at the position of the clamping mouth edge of the upper clamping block 2031 and the lower clamping block 2032;
the driving module 100 is used for driving the wire clamping module 200 and the wire stripping module 300 to rotate around the conducting wire together. In practice, the overhead wire is clamped between the tool bit of the wire stripper and the protrusion 2034 of the wire clamp module 200, the wire clamp module 200 moves forward while rotating, and the tool bit 301 advances to strip the wire spirally. The wire stripper further comprises a detection part for detecting whether the wire stripper peels off the insulation skin. The detection component comprises two contact bars 204, and the two contact bars 204 are respectively contacted with two points of the lead. The two contact strips 204 and the tool bit 301 are respectively connected into the detection circuit, and whether the insulation skin is stripped by the wire stripper or not and whether the tool bit 301 nicks the lead or not are judged according to the change of voltage. If the insulation skin is stripped, the cutter head 301 does not scratch the lead, the cutter head 301 is fixed, and the insulation skin is continuously stripped until the insulation skin is stripped to the preset length; if the insulation skin is not peeled off, the cutter head 301 is pressed down to continue to strip the wire, and then the touch strip 204 is used for detecting whether the insulation skin of the stripped wire is peeled off; if the insulation skin is stripped but the cutter head 301 cuts the wires, the cutter head 301 is lifted to adjust the cutter to continue stripping the wires until the cutter head 301 is detected to strip the insulation skin and the wires are not cut at the same time.
When the wire stripper is used for stripping wires on a 10KV overhead line, when the cutter head 301 and the contact strip 204 are both in contact with the wire skin, the wire skin is in a non-conducting state, and a rear-stage circuit outputs high level; in the wire stripping process, when the contact strip 204 contacts the wire core first, if the cutter head 301 also contacts the wire core, a path is formed, the later stage circuit outputs a low level, and the wire stripper quickly lifts the cutter, so that the wire core can be prevented from being damaged.
In order to solve the problem that charges accumulated by friction between metal and a wire skin (made of Teflon or polyethylene materials) are released instantly when a contact strip 204 touches an overhead wire core in the process of stripping the 10KV overhead wire by the wire stripper, after a current loop (namely a wire stripper current loop) formed by a tool bit 301 and the contact strip 204 is input, an electrostatic protection circuit is arranged in front of a detection part, so that electromagnetic radiation to a main controller of the wire stripper is prevented from being caused, the operation of the main controller of the wire stripper is prevented from being interfered, and the operation stability of the main controller of the wire stripper is prevented from being continuously influenced by an electrostatic field formed by the accumulated charges.
As shown in fig. 4, a single-board power supply of the wire stripper is used for supplying power to an isolated power supply in the electrostatic protection circuit; signals of ports (a touch strip and a tool bit) of a current loop of the wire stripper are connected into the electrostatic protection circuit, and the signals are output to a main controller of the wire stripper for state judgment after the electrostatic protection circuit absorbs and isolates high-frequency high-energy static electricity of an electrostatic field, so that whether the tool bit 301 and the touch strip 204 touch a wire core is judged.
As shown in fig. 5, the esd protection circuit of this embodiment includes a front-end absorption circuit, an isolated power circuit, and a back-end digital processing circuit.
The front-end absorption circuit comprises an absorption element, a decoupling element and a filter element, and can absorb and convert high-frequency high-energy static electricity into common-mode voltage, preferably, the absorption element adopts TVS (transient voltage suppressor), the decoupling element adopts magnetic beads, and the filter element adopts a large-capacity (for example, 1000pF) capacitor. As shown in fig. 6, the clamping diode VD3 is used as TVS, the negative electrode of the clamping diode VD3 is connected to the contact strip of the wire stripper (i.e. port 1 of the wire stripper current loop port X3, hereinafter referred to as X3.1), and the positive electrode is connected to the tool bit (i.e. port 2 of the wire stripper current loop port X3, hereinafter referred to as X3.2); one end of the magnetic bead L7 is connected with X3.1, and the other end is connected with a large-capacity capacitor (such as 1000pF) C55 and resistors R40 and R17 and then connected with the output voltage VCC5V _ P of the isolation power supply circuit; one end of the magnetic bead L13 is connected with X3.2, and the other end is connected with an output ground GND _ P of the isolation power supply circuit; the bulk capacitor (e.g., 1000pF) C61 is connected across isolated supply circuit output voltage VCC5V _ P and isolated supply circuit output ground GND _ P. Further, a voltage stabilizing element (e.g., a clamping diode VD5 or other voltage stabilizing device) may be provided in parallel with the capacitor C61 to stabilize the isolated power supply circuit output voltage VCC5V _ P. Static electricity generated in the wire stripping process enters the static electricity protection circuit from the contact strip, and the TVS absorbs the static electricity. Specifically, static electricity enters an electrostatic protection circuit of the wire stripper from a contact strip (X3.1), and VD3 and VD5 are conducted, so that high-frequency high-energy static electricity energy at a current loop port of the wire stripper can be absorbed, the energy is rapidly expanded to the whole electrostatic protection circuit and converted into common-mode voltage, a differential-mode interference signal is converted into a common-mode interference signal, and the influence of differential-mode interference is reduced. The decoupling element adopts magnetic beads L7 and L13, one end of each of the magnetic beads L7 and L13 is connected with the absorption element VD3, the other end of each of the magnetic beads L7 and L13 is connected with the filter element C55, and the electrostatic interference energy is blocked, so that the absorption of an electrostatic field is close to the first input port and the second input port, and the electrostatic interference energy to the wire stripper main controller is reduced; the filter elements C55 and C61 are used for filtering the interference of high-frequency static electricity of ten megahertz level in unabsorbed static electricity, so as to reduce the interference energy of the static electricity to the wire stripper main controller, and are used for resisting ns-level time interference of the static electricity. The ns-level time interference of static electricity corresponds to the frequency of ten megahertz, and the magnetic beads can be used for better realizing the decoupling function. Meanwhile, the capacitors C55 and C61 and the magnetic beads L7 and L13 can weaken electrostatic interference energy, so that the influence of interference at the port X3 (a contact strip and a cutter head) on a single plate of the wire stripper is weakened.
The signal electrostatic field after common mode is strong, and can interfere other modules (including the wire stripper controller behind the back end digital processing circuit) through the ground plane of the single board, so that the signal electrostatic after common mode needs to be isolated by using an isolation power supply, so that the signal electrostatic after common mode does not interfere with the wire stripper controller. As shown in fig. 7, the electrostatic protection circuit of this embodiment adds an isolation power module M1, which can further reduce the interference of noise caused by the electrostatic field at the current loop port of the wire stripper to the wire stripper controller. The single-board power supply of the wire stripper supplies power to the isolation power supply module, and the power is isolated by the isolation power supply and then output to the front-end absorption circuit and the rear-end digital processing circuit, so that the power output by the isolation power supply module is completely isolated from the power supply of the single board of the wire stripper, namely, the electrostatic field generated in the wire stripping process is completely isolated from the wire stripper controller. Considering that the structural size of the wire stripper is reduced as much as possible, the push-pull isolation power supply module is used in the embodiment, and the push-pull output module can meet the functional requirements and is small in size. It can be understood that the flyback isolation module can also be used as the isolation power supply module, as long as the flyback isolation module achieves the isolation capability matched with the size of the electrostatic field at the port of the current loop of the wire stripper. And after the common-mode signal is output through an isolation power supply module M1, the common-mode signal is connected with filter capacitors C21 and C56 and a resistor R70 in parallel and is output to a rear-end digital processing circuit to judge whether the tool bit and the touch strip are in contact or not.
The isolated power supply module M1 is selected according to the actual condition of the electrostatic field. The static electricity tester purchased from outsourcing can be used for measuring the charges of the overhead line skin and the metal surfaces which rub each other, and the size of the static electric field can be obtained from the magnitude. For example, through measurement, when the intelligent wire stripper related to the present embodiment works, the electrostatic charge generated is basically about 5KV, and then the isolated 6KV power module with push-pull output may be selected, because the electrostatic energy actually coupled to the single plate of the wire stripper may be attenuated due to the capacitive and inductive properties of the components on the single plate of the wire stripper. The power supply output by the isolation power supply module for isolating 6KV is completely isolated from the single plate of the wire stripper, namely, the electrostatic field generated in the wire stripping process is completely isolated from the wire stripper controller.
As shown in fig. 8, the back-end digital processing circuit includes a comparator D3, an optical coupler D4, a pull-up resistor R69, a voltage-dividing resistor R64, R65, R67, R31, R18, and the like. The comparator D3 is used for comparing the voltage levels of the tool bit 301 and the touch strip 204 after the front end absorption circuit absorbs high-frequency high-energy static electricity and the isolation power supply circuit isolates the static electricity field, and outputs corresponding high and low levels, the optical coupler D4 is used for carrying out signal isolation on high and low level signals output by the comparator D3 and then outputting the signals to the wire stripper controller, and further judging the states of the tool bit and the touch strip of the wire stripper according to the received high and low levels. Aiming at the problem that a shielding layer is arranged between a sheath and a core of an overhead line, but the resistance value of the shielding layer is not fixed (generally between 40 omega and 3K omega) and the national standard is not available, a resistance detection circuit (R17, R40, L7, X3 and L13 of the shielding layer between the sheath and the core of the overhead line) adopts voltage dividing resistors R64, R65, R31 and R18 to divide voltage, the resistance values of the voltage dividing resistors R31 and R18 are equal to the minimum resistance (for example 40 omega) of the shielding layer, the minimum voltage value (for example 0.8V) of the voltage dividing resistors is used as the standard voltage of a comparator D3 of a rear-end digital circuit, and the comparator D3 is used for comparing the standard voltage of 0.8V with the voltage value of a current loop of a wire stripper. If the fact that the cutter head and the touch strip are in contact with the wire core is detected, the comparator outputs a low level, the optical coupler D4 carries out signal isolation and outputs a low level (an E _ A signal is a low level), the wire stripper controller judges that the cutter head and the touch strip are in contact with the wire core according to the low level of the received E _ A signal, the cutter head is controlled to lift up, and the wire core is prevented from being damaged; if the fact that the contact strip does not contact the wire core is detected, the comparator D3 outputs a high level, the optical coupler D4 outputs a high level, the wire stripper controller judges that the cutter head and the contact strip do not contact the wire core according to the low level of the received E _ A signal, and the cutter head is controlled to continuously cut the overhead wire. Thereby achieving a safe closed loop.
According to the electrostatic protection circuit and the wire stripper adopting the electrostatic protection circuit, static electricity generated in the wire stripping process enters the electrostatic protection circuit from the contact strip, electromagnetic field energy is rapidly expanded to the whole electrostatic protection circuit through TVS conduction, common mode interference is formed, and differential mode interference is reduced; and meanwhile, decoupling magnetic beads are added, so that the absorption is closer to the touch strip and the tool bit, and the interference energy of static electricity to the wire stripper controller is reduced.
According to the electrostatic protection circuit and the wire stripper adopting the electrostatic protection circuit, the isolation power circuit is adopted to supply power to the front-end absorption circuit and the rear-end digital processing circuit, so that static electricity converted into common-mode voltage is isolated from the wire stripper controller circuit, interference of noise caused by electrostatic field at the port of a current loop of the wire stripper on the wire stripper controller is further reduced, and the volume of the wire stripper is smaller by selecting the push-pull output power isolation module.
The static protection circuit and the wire stripper adopting the static protection circuit aim at solving the problems that the resistance value of the shielding layer on the inner layer of the overhead line is not fixed and has no national standard, the minimum value of the resistance partial pressure is used for calculating the corresponding standard voltage of the comparator, and the high and low levels are output to the wire stripper controller through the comparator and the optical coupler for state judgment. If it all contacts the sinle silk to measure tool bit and touch strip, the low level of comparator output, the opto-coupler carries out signal isolation, and the output low level controls the tool bit and lifts up, avoids hindering the sinle silk to realize safe closed loop.
Although the present invention has been described in terms of the preferred embodiment, it is not intended that the invention be limited to the embodiment. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of the invention should therefore be determined with reference to the appended claims.
Claims (7)
1. A kind of electrostatic protection circuit, there are first input port and second input port, said first input port and second input port are used for inputting the external static, characterized by that, also include the front end absorption circuit, isolate the power supply circuit and back end digital processing circuit;
the front-end absorption circuit comprises an absorption element, a decoupling element and a filter element; one end of the absorption element is connected with the first input port, and the other end of the absorption element is connected with the second input port and used for absorbing external static electricity and converting the external static electricity into common-mode voltage; one end of the decoupling element is connected with the absorbing element, and the other end of the decoupling element is connected with the filtering element and is used for blocking electrostatic interference energy; the filter element is used for filtering the interference of the static electricity of ten megahertz level in the unabsorbed static electricity;
the isolation power supply circuit is used for supplying power to the front-end absorption circuit and the rear-end digital processing circuit so as to isolate the converted common-mode voltage from an external output circuit; the isolation power supply circuit comprises an isolation power supply module, a filter capacitor and a first resistor which are connected with the isolation power supply module in parallel; the isolation power supply module can isolate the electrostatic field size exceeding the external static electricity;
and the back-end digital processing circuit is used for transmitting the converted common-mode voltage to an external output circuit.
2. The electrostatic protection circuit of claim 1, wherein said first input port is connected to a tool bit of a wire stripper operating in a rotating friction mode, said second input port is connected to a contact strip of the wire stripper, said external static electricity is an electrostatic field generated at the tool bit and the contact strip of the wire stripper, and said external output circuit is a wire stripper controller circuit.
3. The electrostatic protection circuit according to claim 1, wherein the absorbing element is TVS, the decoupling element is magnetic beads, the filter element is a capacitor, and the front end absorbing circuit comprises an absorbing element, a first decoupling element, a second decoupling element, a first filter element and a second filter element; one end of the absorption element is connected with the first input port, and the other end of the absorption element is connected with the second input port; one end of the first decoupling element is connected with the first input port, and the other end of the first decoupling element is connected with the first filter element and the second resistor and then connected with the output voltage of the isolation power supply circuit; one end of the second decoupling element is connected with the second input port, and the other end of the second decoupling element is connected with the output ground of the isolation power supply circuit; the two ends of the second filter element are connected with the output voltage of the isolation power supply circuit and the output ground of the isolation power supply circuit.
4. The ESD protection circuit of claim 1 wherein the isolated power supply module is a push-pull output isolated power supply module or a flyback isolated power supply module.
5. The electrostatic protection circuit according to claim 1, wherein the back-end digital processing circuit comprises a comparator and an optical coupler, the comparator is used for comparing a standard voltage with a voltage value of the external electrostatic current loop and outputting the standard voltage and the voltage value to the optical coupler; the optical coupler outputs high and low levels to the external output circuit after signal isolation.
6. The electrostatic protection circuit according to claim 5, wherein the first input port is connected to a tool bit of a wire stripper which operates in a rotary friction manner, the second input port is connected to a contact strip of the wire stripper, the external static electricity is an electrostatic field generated by the wire stripper at the tool bit and the contact strip in a wire stripping process, the external output circuit is a wire stripper controller circuit, the wire stripper is used for stripping a sheath of an overhead wire, the standard voltage of the comparator is a voltage minimum value of a divider resistor of a resistance detection circuit between the sheath and a wire core of the overhead wire, and the resistance value of the divider resistor is equal to the minimum resistance between the sheath and the wire core of the overhead wire.
7. A wire stripper comprising the electrostatic protection circuit according to any one of claims 1 to 6.
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| CN202010976542.8A CN112072626B (en) | 2020-09-16 | 2020-09-16 | Electrostatic protection circuit and wire stripper |
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Citations (13)
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| CN112072626B (en) | 2022-09-02 |
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