CN216451183U - Power supply system of power transmission line detection equipment based on online power taking - Google Patents
Power supply system of power transmission line detection equipment based on online power taking Download PDFInfo
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- CN216451183U CN216451183U CN202123428155.XU CN202123428155U CN216451183U CN 216451183 U CN216451183 U CN 216451183U CN 202123428155 U CN202123428155 U CN 202123428155U CN 216451183 U CN216451183 U CN 216451183U
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- 229910052744 lithium Inorganic materials 0.000 claims abstract description 23
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 229910044991 metal oxide Inorganic materials 0.000 claims 1
- 150000004706 metal oxides Chemical class 0.000 claims 1
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- 229910052710 silicon Inorganic materials 0.000 claims 1
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- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
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Abstract
The utility model provides a power supply system of power transmission line detection equipment based on online power taking, wherein the power supply system comprises: the current transformer is a straight-through current transformer and is arranged on the power transmission line, the output end of the current transformer is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the input end of the overvoltage protection circuit, the output end of the overvoltage protection circuit is connected with the input end of the current regulation circuit, the output end of the current regulation circuit is connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit supplies power to a load; the open-circuit protection circuit is arranged on the secondary side of the current transformer and used for detecting the open-circuit of the secondary side of the current transformer and executing the open-circuit protection when the open circuit is carried out, the first control end and the second control end of the switching control circuit are connected to the control output end of the current adjusting circuit, the input end of the switching control circuit is connected to the anode of the lithium battery, and the output end of the switching control circuit supplies power to a load.
Description
Technical Field
The utility model relates to an electric power supply system, in particular to a power supply system of power transmission line detection equipment based on online power taking.
Background
In the transmission line operation, need set up corresponding monitoring facilities and monitor the transmission line, for example current transformer, voltage transformer, environmental sensor (for example temperature, humidity, particulate matter concentration, wind speed etc. these parameters are used for transmission line's state judgement such as deposition, icing) etc. monitor, and upload real-time data through corresponding controller, in these equipment operations, need carry out low voltage direct current power supply, in the traditional mode, generally adopt the battery or get one or several kinds in the electricity on line and combine together, among the prior art, it is very extensive to get the electricity from the transmission line on line and use, however, still have following problem: when the current obtained on line has overcurrent but the overcurrent value does not reach the overcurrent protection threshold value, the existing equipment cannot perform corresponding current adjustment, so that the current equipment is influenced, in addition, the existing switching circuit of the on-line power supply and the standby battery is complicated, and the stability is not good if the structure is simplified; on the other hand, if the joint of the existing current transformer is loosened due to some reasons, such as vibration, the secondary side of the current transformer is easy to open when the current transformer is used for taking electricity, and therefore serious potential safety hazards exist.
Therefore, in order to solve the above technical problems, it is necessary to provide a new technical means.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a power supply system for power transmission line detection equipment based on online power acquisition, which can monitor and protect the secondary side open circuit state of a current transformer during online power acquisition, thereby avoiding potential safety hazards, and can realize current adjustment during power supply, and can quickly switch to a lithium battery power supply state during overvoltage protection, thereby ensuring the stability of power supply of electrical devices.
The utility model provides a power supply system of power transmission line detection equipment based on online power taking, which comprises a current transformer CT1, a rectification circuit REC1, a filter circuit FIL1, an open-circuit protection circuit, an overvoltage protection circuit, a current regulation circuit, a lithium battery, a voltage stabilizing circuit, a battery management circuit and a switching control circuit, wherein the current transformer CT1 is connected with the current transformer REC 1;
the current transformer CT1 is a straight-through current transformer and is arranged on a power transmission line, the output end of the current transformer CT1 is connected with the input end of a rectifying circuit REC1, the output end of the rectifying circuit REC1 is connected with the input end of a filter circuit FIL1, the output end of the filter circuit FIL1 is connected with the input end of an overvoltage protection circuit, the output end of the overvoltage protection circuit is connected with the input end of a current adjusting circuit, the output end of the current adjusting circuit is connected with the input end of a voltage stabilizing circuit, and the output end of the voltage stabilizing circuit supplies power to a load;
open circuit protection circuit sets up in current transformer CT 1's secondary side for open circuit to current transformer CT 1's secondary side detects and carries out the protection of opening a way when opening a way, switching control circuit's first control end and second control end are connected in current adjustment circuit's control output, and switching control circuit's input is connected in the positive pole of lithium cell, and switching control circuit's output is to load power supply, and battery management circuit's power input end is connected in current adjustment circuit, and battery management circuit's power output end is connected in the positive pole of lithium cell, and battery management circuit still detects the voltage of lithium cell and carries out charge-discharge management.
Further, the open-circuit protection circuit comprises a diode D2, a resistor R19, a resistor R20, a resistor R18, a resistor R17, a capacitor C4, a capacitor C5, a thyristor Q10 and a voltage regulator tube ZD 3;
the anode of the diode D2 is connected to the end of the same name of the secondary side coil of the current transformer CT1, the cathode of the diode D2 is connected in series with the resistor R19 and the resistor R20 and then grounded, the common connection point of the resistor R19 and the resistor R20 is connected to the cathode of the voltage regulator tube ZD3, the anode of the voltage regulator tube ZD3 is connected to the control electrode of the thyristor Q10 through the resistor R18, the anode of the voltage regulator tube ZD3 is grounded through the capacitor C4, the control electrode of the thyristor Q10 is grounded through the capacitor C5, the anode of the thyristor Q10 is connected to the end of the same name of the current transformer CT1, and the cathode of the thyristor Q10 is grounded through the resistor R17.
Further, the overvoltage detection protection circuit comprises a PMOS tube Q1, a delay control circuit and an overvoltage detection control circuit;
the source of the PMOS transistor Q1 is connected to the output end of the filter circuit FIL1, the drain of the PMOS transistor Q1 is connected to the input end of the current adjusting circuit, the gate of the PMOS transistor Q1 is connected to the control output end of the delay control circuit, and the overvoltage detection control circuit is configured to detect the source input voltage of the PMOS transistor Q1 and output a high level to the control input end of the delay control circuit when the input voltage is greater than a set value.
Further, the delay control circuit comprises a resistor R4, a resistor R5, a resistor R11, a resistor R12, a capacitor C2, a triode Q4 and a triode Q3;
one end of a resistor R4 is connected to the source of a PMOS tube Q1, the other end of the resistor R4 is grounded through a capacitor C1, the common connection point of a resistor R4 and a capacitor C1 is connected to the base of a triode Q4 through the resistor R12, the collector of the triode Q4 is connected to the gate of the PMOS tube Q1 through a resistor R11, the gate of a PMOS tube Q1 is connected to the source of the PMOS tube Q1 through a resistor R5, the emitter of the triode Q4 is grounded, the collector of the triode Q3 is connected to the common connection point of the resistor R4 and the capacitor C1, the emitter of the triode Q3 is grounded, and the base of the triode Q3 serves as the control input end of the delay control circuit.
Further, the overvoltage detection control circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R13, a resistor R14, a voltage regulator ZD2 and a P-type triode Q2;
one end of a resistor R1 is connected with a source electrode of a PMOS tube Q1, the other end of the resistor R1 is connected with a negative electrode of a voltage regulator tube ZD2, an anode of the voltage regulator tube ZD2 is grounded through a resistor R14, an emitter of a triode Q2 is connected with a source electrode of a PMOS tube Q1, a base electrode of the triode Q2 is connected with a negative electrode of the voltage regulator tube ZD2, a collector of the triode Q2 is grounded after being connected in series with a resistor R13 through a resistor R2, a common connection point of the resistor R2 and the resistor R13 is connected with one end of the resistor R3, and the other end of the resistor R3 is used as a control output end of the overvoltage detection control circuit.
Further, the current adjusting circuit comprises an NMOS transistor Q6, a resistor R6, a capacitor C2, a voltage regulator ZD1, a resistor R7, a resistor R8, a diode D1, a resistor R9, and a triode Q5;
the drain of the NMOS switch Q6 is used as the input end of the current regulation circuit and connected to the output end of the overvoltage protection circuit, the source of the NMOS transistor Q6 is connected to the anode of the diode D1, the cathode of the diode D1 is used as the output end of the current regulation circuit, the drain of the NMOS transistor Q6 is connected to one end of the resistor R6, the other end of the resistor R6 is grounded through the capacitor C2, the common connection point of the resistor R6 and the capacitor C2 is connected to the gate of the NMOS transistor Q6, the gate of the NMOS transistor Q6 is connected to the cathode of the regulator ZD1, the anode of the regulator ZD1 is grounded, the source of the NMOS transistor Q6 is grounded after being connected in series with the resistor R9 through the resistor R7, the common connection point of the resistor R7 and the resistor R9 is connected to the base of the triode Q5, the emitter of the triode Q5 is grounded, the collector of the triode Q5 is connected to the gate of the NMOS transistor Q6 through the resistor R8, and the common connection point of the resistor R6 and the capacitor C2 is used as the control output end of the current detection circuit.
Further, the switching control circuit comprises a resistor R10, a resistor R15, a resistor R16, a PMOS tube Q7, a thyristor Q9 and a P-type triode Q8;
the positive electrode of the thyristor Q9 is connected to the positive electrode of the lithium battery as the input end of the switching control circuit, the negative electrode of the thyristor Q9 is connected to the source electrode of the PMOS tube Q7, the drain electrode of the PMOS tube Q7 is connected to the negative electrode of the diode D1, the drain electrode of the PMOS tube Q7 is grounded through the capacitor C3, the source electrode of the PMOS tube Q7 is connected to the gate electrode of the PMOS tube Q7 through the resistor R16, the gate electrode of the PMOS tube Q7 is connected to the emitter electrode of the transistor Q8, the collector electrode of the transistor Q8 is grounded through the resistor R15, the base electrode of the transistor Q8 is connected to the common connection point of the resistor R6 and the capacitor C2 as the first control end of the switching control circuit, the control electrode of the thyristor Q9 is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the common connection point of the resistor R6 and the capacitor C2 as the second control end of the switching control circuit.
Further, the battery management circuit is a CN3765 chip, and a power supply terminal of the battery management circuit is connected to the anode of the diode D1.
The utility model has the beneficial effects that: according to the utility model, the secondary side open circuit state of the current transformer can be monitored and protected during online power taking, so that potential safety hazards are avoided, current adjustment can be realized in the power supply process, and the lithium battery power supply state can be rapidly switched during overvoltage protection, so that the power supply stability of electric appliances is ensured.
Drawings
The utility model is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of an overvoltage protection circuit, a current regulation circuit and a switching control circuit according to the present invention.
Fig. 3 is a schematic diagram of an open circuit protection circuit of the present invention.
Detailed Description
The utility model is described in further detail below with reference to the drawings of the specification:
the utility model provides a power supply system of power transmission line detection equipment based on online power taking, which comprises a current transformer CT1, a rectification circuit REC1, a filter circuit FIL1, an open-circuit protection circuit, an overvoltage protection circuit, a current regulation circuit, a lithium battery, a voltage stabilizing circuit, a battery management circuit and a switching control circuit, wherein the current transformer CT1 is connected with the current transformer REC 1;
the current transformer CT1 is a straight-through current transformer and is arranged on a power transmission line, the output end of the current transformer CT1 is connected with the input end of a rectifying circuit REC1, the output end of the rectifying circuit REC1 is connected with the input end of a filter circuit FIL1, the output end of the filter circuit FIL1 is connected with the input end of an overvoltage protection circuit, the output end of the overvoltage protection circuit is connected with the input end of a current adjusting circuit, the output end of the current adjusting circuit is connected with the input end of a voltage stabilizing circuit, and the output end of the voltage stabilizing circuit supplies power to a load;
the open-circuit protection circuit is arranged on the secondary side of the current transformer CT1 and used for detecting the open circuit of the secondary side of the current transformer CT1 and executing open-circuit protection when the open circuit is detected, a first control end and a second control end of the switching control circuit are connected to a control output end of the current adjusting circuit, an input end of the switching control circuit is connected to the anode of the lithium battery, an output end of the switching control circuit supplies power to a load, a power input end of the battery management circuit is connected to the current adjusting circuit, a power output end of the battery management circuit is connected to the anode of the lithium battery, and the battery management circuit also detects the voltage of the lithium battery and performs charge-discharge management; wherein, voltage stabilizing circuit adopts current voltage stabilizing circuit, for example chip such as LM7809, LM7805, select according to the voltage of electrical apparatus, the mode that voltage stabilizing circuit of multiple voltage also combines together is used, in order to satisfy the difference with the required operating voltage's of electrical apparatus demand, through above-mentioned structure, can monitor and carry out the protection to current transformer's secondary side open circuit state when getting the electricity on line, thereby avoid the potential safety hazard, and, can realize the current adjustment at power supply in-process, and can be rapid when overvoltage protection carries out the switching to lithium cell power supply state, thereby ensure the stability with the electrical apparatus power supply.
In this embodiment, the open-circuit protection circuit includes a diode D2, a resistor R19, a resistor R20, a resistor R18, a resistor R17, a capacitor C4, a capacitor C5, a thyristor Q10, and a voltage regulator ZD 3;
the anode of the diode D2 is connected to the end with the same name of the secondary side coil of the current transformer CT1, the cathode of the diode D2 is connected in series with the resistor R19 and the resistor R20 and then grounded, the common connection point of the resistor R19 and the resistor R20 is connected to the cathode of a voltage regulator tube ZD3, the anode of the voltage regulator tube ZD3 is connected to the control electrode of a thyristor Q10 through a resistor R18, the anode of the voltage regulator tube ZD3 is grounded through a capacitor C4, the control electrode of the thyristor Q10 is grounded through a capacitor C5, the anode of the thyristor Q10 is connected to the end with the same name of the current transformer CT1, and the cathode of the thyristor Q10 is grounded through a resistor R17; the bidirectional transient suppression diode TVS is used for lightning current protection; the diode D2 is used for rectification, when the secondary side is open-circuited, the diode D2 generates induction high voltage, the high voltage enables the voltage regulator tube ZD3 to be conducted, and therefore the thyristor Q10 is triggered to be conducted, and further the secondary side of the current transformer forms a new closed loop to play a good protection role. The thyristor Q10 is a bidirectional thyristor.
In this embodiment, the overvoltage detection protection circuit includes a PMOS transistor Q1, a delay control circuit, and an overvoltage detection control circuit;
the source of the PMOS transistor Q1 is connected to the output end of the filter circuit FIL1, the drain of the PMOS transistor Q1 is connected to the input end of the current adjusting circuit, the gate of the PMOS transistor Q1 is connected to the control output end of the delay control circuit, and the overvoltage detection control circuit is configured to detect the source input voltage of the PMOS transistor Q1 and output a high level to the control input end of the delay control circuit when the input voltage is greater than a set value.
Specifically, the method comprises the following steps: the delay control circuit comprises a resistor R4, a resistor R5, a resistor R11, a resistor R12, a capacitor C2, a triode Q4 and a triode Q3;
one end of a resistor R4 is connected to the source of a PMOS tube Q1, the other end of the resistor R4 is grounded through a capacitor C1, the common connection point of a resistor R4 and a capacitor C1 is connected to the base of a triode Q4 through the resistor R12, the collector of the triode Q4 is connected to the gate of the PMOS tube Q1 through a resistor R11, the gate of a PMOS tube Q1 is connected to the source of the PMOS tube Q1 through a resistor R5, the emitter of the triode Q4 is grounded, the collector of the triode Q3 is connected to the common connection point of the resistor R4 and the capacitor C1, the emitter of the triode Q3 is grounded, and the base of the triode Q3 serves as the control input end of the delay control circuit.
The overvoltage detection control circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R13, a resistor R14, a voltage regulator tube ZD2 and a P-type triode Q2;
one end of a resistor R1 is connected with a source electrode of a PMOS tube Q1, the other end of the resistor R1 is connected with a negative electrode of a voltage regulator tube ZD2, an anode of the voltage regulator tube ZD2 is grounded through a resistor R14, an emitter of a triode Q2 is connected with a source electrode of a PMOS tube Q1, a base electrode of the triode Q2 is connected with a negative electrode of the voltage regulator tube ZD2, a collector of the triode Q2 is grounded after being connected in series with a resistor R13 through a resistor R2, a common connection point of the resistor R2 and the resistor R13 is connected with one end of the resistor R3, and the other end of the resistor R3 is used as a control output end of the overvoltage detection control circuit.
When the source of the PMOS transistor Q1 has voltage input, the capacitor C1 is charged through the resistor R4, at this time, the base voltage of the transistor Q4 does not reach a saturation conducting voltage, the transistor Q4 is cut off, in the charging process of the capacitor C1, the overvoltage detection circuit performs voltage detection, when the voltage is normal, a reverse bias voltage does not exist between the base and the emitter of the transistor Q2, the transistor Q2 is cut off, at this time, the transistor Q3 is cut off, after the capacitor C1 is charged, the transistor Q4 is turned on, the PMOS transistor Q1 is turned on to supply power to the next time, when the voltage is overvoltage, the voltage regulator ZD2 is turned on to pull down the base voltage of the transistor Q2, and a high-level output is provided between the common connection point of the resistor R2 and the resistor R3, so that the transistor Q3 is turned on to cut off the transistor Q4 and further cut off the PMOS transistor Q1, thereby realizing overvoltage protection.
In this embodiment, the current adjusting circuit includes an NMOS transistor Q6, a resistor R6, a capacitor C2, a voltage regulator ZD1, a resistor R7, a resistor R8, a diode D1, a resistor R9, and a transistor Q5;
the drain of the NMOS switch Q6 is used as the input end of the current regulation circuit and connected to the output end of the overvoltage protection circuit, the source of the NMOS transistor Q6 is connected to the anode of the diode D1, the cathode of the diode D1 is used as the output end of the current regulation circuit, the drain of the NMOS transistor Q6 is connected to one end of the resistor R6, the other end of the resistor R6 is grounded through the capacitor C2, the common connection point of the resistor R6 and the capacitor C2 is connected to the gate of the NMOS transistor Q6, the gate of the NMOS transistor Q6 is connected to the cathode of the regulator ZD1, the anode of the regulator ZD1 is grounded, the source of the NMOS transistor Q6 is grounded after being connected in series with the resistor R9 through the resistor R7, the common connection point of the resistor R7 and the resistor R9 is connected to the base of the triode Q5, the emitter of the triode Q5 is grounded, the collector of the triode Q5 is connected to the gate of the NMOS transistor Q6 through the resistor R8, and the common connection point of the resistor R6 and the capacitor C2 is used as the control output end of the current detection circuit. When the PMOS tube Q1 has output, the NMOS tube is conducted, when overcurrent exists but the current value does not reach the overcurrent protection limit value, at the moment, the triode Q5 is conducted, so that the grid voltage of the NMOS tube Q6 is reduced, the NMOS tube Q6 is partially conducted, the current output is reduced, and the current adjustment is completed, wherein the resistor R7 is realized by adopting the existing adjustable resistor and is used for adjusting the conducting voltage of the triode Q5.
In this embodiment, the switching control circuit includes a resistor R10, a resistor R15, a resistor R16, a PMOS transistor Q7, a thyristor Q9, and a P-type triode Q8;
the positive electrode of the thyristor Q9 is connected to the positive electrode of the lithium battery as the input end of the switching control circuit, the negative electrode of the thyristor Q9 is connected to the source electrode of the PMOS tube Q7, the drain electrode of the PMOS tube Q7 is connected to the negative electrode of the diode D1, the drain electrode of the PMOS tube Q7 is grounded through the capacitor C3, the source electrode of the PMOS tube Q7 is connected to the gate electrode of the PMOS tube Q7 through the resistor R16, the gate electrode of the PMOS tube Q7 is connected to the emitter electrode of the transistor Q8, the collector electrode of the transistor Q8 is grounded through the resistor R15, the base electrode of the transistor Q8 is connected to the common connection point of the resistor R6 and the capacitor C2 as the first control end of the switching control circuit, the control electrode of the thyristor Q9 is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the common connection point of the resistor R6 and the capacitor C2 as the second control end of the switching control circuit. The thyristor Q9 has a triggering characteristic, that is, the Q9 must be triggered to conduct, otherwise, the thyristor Q9 is not conducted, at this time, the thyristor Q9 is triggered to conduct when the whole system is not powered, that is, the overvoltage protection circuit does not enter a power supply state, and the lithium battery operates earlier than an online power supply loop, so as to ensure the power supply order and the power supply stability, when the PMOS tube Q1 has an output, the voltage of the lithium battery is loaded on the source of the PMOS tube Q7, at this time, because the base voltage of the triode Q8 is greater than the emitter voltage and is not reverse biased, the PMOS tube Q7 is cut off, when the PMOS tube Q1 is switched from output to no output (including overvoltage protection, current transformer CT1 fault and the like), at this time, the base of the triode Q8 is in a low level state, so that the reverse bias is conducted, and then the Q7 is conducted, and the lithium battery enters a power supply state, so that the switching can be substantially seamless, when the output of the PMOS tube Q1 is recovered, although the Q9 is turned on, the Q8 is recovered to be cut off, the Q7 is also recovered to be cut off, and the lithium battery is not supplied with power any more.
The battery management circuit is a CN3765 chip, and a power supply end of the battery management circuit is connected to the anode of the diode D1.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (8)
1. The utility model provides a transmission line check out test set power supply system based on get electricity on line which characterized in that: the circuit comprises a current transformer CT1, a rectifier circuit REC1, a filter circuit FIL1, an open-circuit protection circuit, an overvoltage protection circuit, a current adjusting circuit, a lithium battery, a voltage stabilizing circuit, a battery management circuit and a switching control circuit;
the current transformer CT1 is a straight-through current transformer and is arranged on a power transmission line, the output end of the current transformer CT1 is connected with the input end of a rectifying circuit REC1, the output end of the rectifying circuit REC1 is connected with the input end of a filter circuit FIL1, the output end of the filter circuit FIL1 is connected with the input end of an overvoltage protection circuit, the output end of the overvoltage protection circuit is connected with the input end of a current adjusting circuit, the output end of the current adjusting circuit is connected with the input end of a voltage stabilizing circuit, and the output end of the voltage stabilizing circuit supplies power to a load;
open circuit protection circuit sets up in current transformer CT 1's secondary side for open circuit to current transformer CT 1's secondary side detects and carries out the protection of opening a way when opening a way, switching control circuit's first control end and second control end are connected in current adjustment circuit's control output, and switching control circuit's input is connected in the positive pole of lithium cell, and switching control circuit's output is to load power supply, and battery management circuit's power input end is connected in current adjustment circuit, and battery management circuit's power output end is connected in the positive pole of lithium cell, and battery management circuit still detects the voltage of lithium cell and carries out charge-discharge management.
2. The power supply system of the power transmission line detection equipment based on online power taking as claimed in claim 1, characterized in that: the open-circuit protection circuit comprises a diode D2, a resistor R19, a resistor R20, a resistor R18, a resistor R17, a capacitor C4, a capacitor C5, a thyristor Q10 and a voltage regulator tube ZD 3;
the anode of the diode D2 is connected to the end of the same name of the secondary side coil of the current transformer CT1, the cathode of the diode D2 is connected in series with the resistor R19 and the resistor R20 and then grounded, the common connection point of the resistor R19 and the resistor R20 is connected to the cathode of the voltage regulator tube ZD3, the anode of the voltage regulator tube ZD3 is connected to the control electrode of the thyristor Q10 through the resistor R18, the anode of the voltage regulator tube ZD3 is grounded through the capacitor C4, the control electrode of the thyristor Q10 is grounded through the capacitor C5, the anode of the thyristor Q10 is connected to the end of the same name of the current transformer CT1, and the cathode of the thyristor Q10 is grounded through the resistor R17.
3. The power supply system of the power transmission line detection equipment based on online power taking as claimed in claim 1, characterized in that: the overvoltage detection protection circuit comprises a PMOS tube Q1, a delay control circuit and an overvoltage detection control circuit;
the source of the PMOS transistor Q1 is connected to the output end of the filter circuit FIL1, the drain of the PMOS transistor Q1 is connected to the input end of the current adjusting circuit, the gate of the PMOS transistor Q1 is connected to the control output end of the delay control circuit, and the overvoltage detection control circuit is configured to detect the source input voltage of the PMOS transistor Q1 and output a high level to the control input end of the delay control circuit when the input voltage is greater than a set value.
4. The power supply system of the electric transmission line detection equipment based on online power taking as claimed in claim 3, characterized in that: the delay control circuit comprises a resistor R4, a resistor R5, a resistor R11, a resistor R12, a capacitor C2, a triode Q4 and a triode Q3;
one end of a resistor R4 is connected to the source of a PMOS tube Q1, the other end of the resistor R4 is grounded through a capacitor C1, the common connection point of a resistor R4 and a capacitor C1 is connected to the base of a triode Q4 through the resistor R12, the collector of the triode Q4 is connected to the gate of the PMOS tube Q1 through a resistor R11, the gate of a PMOS tube Q1 is connected to the source of the PMOS tube Q1 through a resistor R5, the emitter of the triode Q4 is grounded, the collector of the triode Q3 is connected to the common connection point of the resistor R4 and the capacitor C1, the emitter of the triode Q3 is grounded, and the base of the triode Q3 serves as the control input end of the delay control circuit.
5. The power supply system of the electric transmission line detection equipment based on online power taking as claimed in claim 3, characterized in that: the overvoltage detection control circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R13, a resistor R14, a voltage regulator tube ZD2 and a P-type triode Q2;
one end of a resistor R1 is connected with a source electrode of a PMOS tube Q1, the other end of the resistor R1 is connected with a negative electrode of a voltage regulator tube ZD2, an anode of the voltage regulator tube ZD2 is grounded through a resistor R14, an emitter of a triode Q2 is connected with a source electrode of a PMOS tube Q1, a base electrode of the triode Q2 is connected with a negative electrode of the voltage regulator tube ZD2, a collector of the triode Q2 is grounded after being connected in series with a resistor R13 through a resistor R2, a common connection point of the resistor R2 and the resistor R13 is connected with one end of the resistor R3, and the other end of the resistor R3 is used as a control output end of the overvoltage detection control circuit.
6. The power supply system of the power transmission line detection equipment based on online power taking as claimed in claim 1, characterized in that: the current adjusting circuit comprises an NMOS tube Q6, a resistor R6, a capacitor C2, a voltage stabilizing tube ZD1, a resistor R7, a resistor R8, a diode D1, a resistor R9 and a triode Q5;
the drain of the NMOS switch Q6 is used as the input end of the current regulation circuit and connected to the output end of the overvoltage protection circuit, the source of the NMOS transistor Q6 is connected to the anode of the diode D1, the cathode of the diode D1 is used as the output end of the current regulation circuit, the drain of the NMOS transistor Q6 is connected to one end of the resistor R6, the other end of the resistor R6 is grounded through the capacitor C2, the common connection point of the resistor R6 and the capacitor C2 is connected to the gate of the NMOS transistor Q6, the gate of the NMOS transistor Q6 is connected to the cathode of the regulator ZD1, the anode of the regulator ZD1 is grounded, the source of the NMOS transistor Q6 is grounded after being connected in series with the resistor R9 through the resistor R7, the common connection point of the resistor R7 and the resistor R9 is connected to the base of the triode Q5, the emitter of the triode Q5 is grounded, the collector of the triode Q5 is connected to the gate of the NMOS transistor Q6 through the resistor R8, and the common connection point of the resistor R6 and the capacitor C2 is used as the control output end of the current detection circuit.
7. The power supply system of the electric transmission line detection equipment based on online power taking as claimed in claim 6, characterized in that: the switching control circuit comprises a resistor R10, a resistor R15, a resistor R16, a PMOS (P-channel metal oxide semiconductor) transistor Q7, a controllable silicon Q9 and a P-type triode Q8;
the positive electrode of the thyristor Q9 is connected to the positive electrode of the lithium battery as the input end of the switching control circuit, the negative electrode of the thyristor Q9 is connected to the source electrode of the PMOS tube Q7, the drain electrode of the PMOS tube Q7 is connected to the negative electrode of the diode D1, the drain electrode of the PMOS tube Q7 is grounded through the capacitor C3, the source electrode of the PMOS tube Q7 is connected to the gate electrode of the PMOS tube Q7 through the resistor R16, the gate electrode of the PMOS tube Q7 is connected to the emitter electrode of the transistor Q8, the collector electrode of the transistor Q8 is grounded through the resistor R15, the base electrode of the transistor Q8 is connected to the common connection point of the resistor R6 and the capacitor C2 as the first control end of the switching control circuit, the control electrode of the thyristor Q9 is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the common connection point of the resistor R6 and the capacitor C2 as the second control end of the switching control circuit.
8. The power supply system of the electric transmission line detection equipment based on online power taking as claimed in claim 6, characterized in that: the battery management circuit is a CN3765 chip, and a power supply end of the battery management circuit is connected to the anode of the diode D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123428155.XU CN216451183U (en) | 2021-12-31 | 2021-12-31 | Power supply system of power transmission line detection equipment based on online power taking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123428155.XU CN216451183U (en) | 2021-12-31 | 2021-12-31 | Power supply system of power transmission line detection equipment based on online power taking |
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| CN216451183U true CN216451183U (en) | 2022-05-06 |
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| CN202123428155.XU Active CN216451183U (en) | 2021-12-31 | 2021-12-31 | Power supply system of power transmission line detection equipment based on online power taking |
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