CN211579672U

CN211579672U - Online power taking system for monitoring generator

Info

Publication number: CN211579672U
Application number: CN201922470757.8U
Authority: CN
Inventors: 石亚伟; 陈孟钢; 罗勇; 廖金波
Original assignee: CHONGQING QINZHI TECHNOLOGY CO LTD
Current assignee: Chongqing Xuanyi Intelligent Technology Co.,Ltd.
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-09-25
Anticipated expiration: 2029-12-31

Abstract

The utility model provides an online electricity taking system for monitoring a generator, which comprises a current transformer for taking electricity from an excitation circuit of the generator, a piezoelectric electricity taking module for taking electricity from an excitation carbon brush of the generator, a temperature difference electricity taking module for taking electricity from a carbon brush of the generator, a vibration electricity taking module for taking electricity from a handle of the generator in a vibration manner, an electric field electricity taking module based on an environmental electric field and a power management module; the power supply comprises an induction power taking module, a piezoelectric power taking module, a temperature difference power taking module, a vibration power taking module and an electric field power taking module, wherein the output end of the induction power taking module, the piezoelectric power taking module, the temperature difference power taking module, the vibration power taking module and the electric field power taking module are connected with the input end of a power supply management module, the power supply management module processes weak current output by each power taking module to form stable direct current to supply power to a load, and electric energy can be obtained from harmonic components of vibration, temperature, electromagnetic.

Description

Online power taking system for monitoring generator

Technical Field

The utility model relates to an on-line electricity taking system especially relates to an on-line electricity taking system for monitoring of generator.

Background

In the working process of a large-scale generator set, the working state of a generator needs to be monitored, various sensors such as a temperature sensor, a vibration sensor and chips for processing signals need to be used in the monitoring process, and the electric equipment needs stable low-voltage direct current in the working process.

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 this, the utility model aims at providing a generator monitoring is with online system of getting electricity can obtain the electric energy in vibration, temperature, electromagnetic environment, exciting current's the harmonic composition in the generator working process to need not to obtain the electric energy from the electric wire netting and provide the power consumption of stabilizing the work to the monitoring element of generator, thereby can effectively avoid the energy extravagant, reduce the circuit arrangement of electric wire netting power supply, practice thrift use cost.

The utility model provides an online electricity taking system for monitoring a generator, which comprises a current transformer for taking electricity from an excitation circuit of the generator, a piezoelectric electricity taking module for taking electricity from an excitation carbon brush of the generator, a temperature difference electricity taking module for taking electricity from a carbon brush of the generator, a vibration electricity taking module for taking electricity from a handle of the generator in a vibration manner, an electric field electricity taking module based on an environmental electric field and a power management module;

the output ends of the induction electricity taking module, the piezoelectric electricity taking module, the temperature difference electricity taking module, the vibration electricity taking module and the electric field electricity taking module are connected with the input end of the power management module, and the power management module processes weak current output by each electricity taking module to form stable direct current to supply power to a load.

Further, the piezoelectric electricity taking module is made of piezoelectric materials, and the piezoelectric materials are arranged on a constant force spring of the generator excitation carbon brush.

Further, the thermoelectric power taking module is a thermoelectric power generation piece, the thermoelectric power generation piece is arranged on an excitation carbon brush of the generator, the hot end of the thermoelectric power generation piece is in contact with the excitation carbon brush, and the cold end of the thermoelectric power generation piece is arranged on a brush holder handle of the excitation carbon brush.

Further, the vibration electricity taking module comprises a permanent magnet, a coil, an insulating tube and two springs, the two springs are fixedly arranged at two ends of the insulating tube respectively, the coil is fixedly sleeved outside the insulating tube, the permanent magnet is arranged in the insulating tube and located between the two springs, and the insulating tube and the coil are arranged in the brush holder handle.

Further, the electric field electricity taking module comprises two polar plates, and the two polar plates are arranged just opposite to each other and fixedly arranged on a brush holder handle of the generator.

Furthermore, the power management module comprises an energy collection circuit, a low-power consumption power circuit, a comparison control circuit and an overvoltage protection circuit;

the input end of the energy collecting circuit is connected with the output end of each power taking module, and the energy collecting circuit is used for collecting and converting micro-current and outputting voltage signals to the low-power-consumption power supply module;

the input end of the low-power-consumption power circuit is connected with the output end of the energy collecting circuit and is used for receiving the voltage signal of the energy collecting circuit and converting the voltage signal into a stable voltage signal to be supplied to a load and a lithium battery;

the comparison control circuit is used for detecting the output voltage of the low-power-consumption power circuit and controlling the low-power-consumption power circuit to stop power supply output when the output voltage of the low-power-consumption power circuit is lower than a voltage threshold value;

the overvoltage protection circuit is used for detecting an input voltage signal of the energy collection circuit and performing overvoltage protection on the rear end circuit of the electric energy acquisition circuit when the voltage value is larger than the safety threshold value.

Further, the low-power-consumption power module comprises a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a capacitor C9, a capacitor C10, an NMOS tube Q6, a PMOS tube Q7 and a diode D2;

the source of the PMOS tube Q7 is connected with one end of a resistor R8, the other end of the resistor R8 is connected with one end of a resistor R11 through a resistor R9, the other end of the resistor R11 is grounded, and a common connection point between the source of the PMOS tube Q7 and the resistor R8 serves as the input end of the low-power-consumption power module and is connected with the output end of the energy collection module;

the source of a PMOS tube Q7 is connected with the gate of a PMOS tube Q7 through a resistor R13, the gate of the PMOS tube Q7 is connected with the drain of an NMOS tube Q6, the source of the NMOS tube Q6 is grounded, the gate of an NMOS tube Q6 is connected with the common connection point between the resistor R9 and the resistor R11, the gate of an NMOS tube Q6 is connected with the common connection point between the resistor R8 and the resistor R9 through a resistor R10, the gate of the NMOS tube Q6 is grounded through a resistor R12, the gate of the NMOS tube Q6 is grounded through a capacitor C9, the drain of the PMOS tube Q7 is grounded through a capacitor C10, and the common connection point of the drain of a PMOS tube Q7 and the capacitor C10 serves as the output end of the low-power-consumption;

the drain electrode of the PMOS tube Q7 is connected with the anode of the diode D2 after being connected in series through the resistor R14 and the resistor R15, the cathode of the diode D2 is connected with the grid electrode of the NMOS tube Q6, and the common connection point between the anode of the diode D2 and the resistor R15 is used as the control input end of the low-power-consumption power supply module.

Further, the energy collection module comprises a chip IC1, a lithium battery BAT1, a capacitor C1, a capacitor C2, a capacitor C3, a lithium battery BAT2, a capacitor C6, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an inductor L1, a PMOS tube Q1, a PMOS tube Q2, a PMOS tube Q3 and a PMOS tube Q4;

the chip IC1 is a BQ25505RFRR chip, one end of an inductor L1 is grounded through a capacitor C1, the other end of the inductor L1 is connected with a pin 20 of the IC1, a common connection point between the inductor L1 and the capacitor C1 is used as an input end of the energy collection module, a pin 4 of the chip IC1 is grounded through a capacitor C2, a pin 1 of the chip IC1 is grounded, a pin 2 of the chip IC1 is connected to a common connection point between the inductor L1 and the capacitor C1, and a pin 5 of the chip IC1 is grounded;

an 8 pin of the chip IC1 is grounded after being connected in series with a resistor R1 and the resistor R1, a common connection point between the resistor R1 and the resistor R1 is connected with a 7 pin of the chip IC1, an 8 pin of the chip IC1 is connected with one end of the resistor R1 through the resistor R1, the other end of the resistor R1 is grounded through the resistor R1, a common connection point between the resistor R1 and the resistor R1 is connected with an 11 pin of the chip IC1, a common connection point between the resistor R1 and the resistor R1 is connected with a 12 pin of the chip IC1, pins 3 and 19 of the chip IC1 are connected with a source of the PMOS Q1, a source of the PMOS Q1 is grounded through a capacitor C1, a drain of the PMOS Q1 is connected with a source of the PMOS Q1, a pin 18 pin of the chip IC1 is connected with an anode of the lithium battery BAT1, a drain of the PMOS Q1 is connected with a drain of the PMOS Q1, and a drain of the PMOS Q1 is connected with a drain of the PMOS Q1 through the PMOS transistor 1. The common connection point between the drain of the PMOS tube Q4 and the capacitor C6 serves as the output end of the energy collection module, the grid of the PMOS tube Q1 and the grid of the PMOS tube Q2 are connected to the 9 pin of the chip IC1, the grids of the PMOS tube Q3 and the PMOS tube Q4 are connected to the 10 pin of the chip IC1, and the 14 pin of the chip IC1 is connected with the anode of the lithium battery BAT 2.

Further, the comparison control circuit comprises a reference circuit, a comparator U1, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20 and a triode Q8;

the comparator is a TLV3961 comparator, the in-phase end of the comparator U1 is connected with the output end of the reference circuit through a resistor R16, the in-phase end of the comparator U1 is connected with the output end of the comparator U1 through a resistor R17, the output end of the comparator U1 is connected with one end of a resistor R20, the other end of the resistor R20 is connected with the base electrode of the triode Q8, the emitter electrode of the triode Q8 is grounded, and the collector electrode of the triode Q8 serving as the control output end of the comparison control circuit is connected with the control input end of the low-power-consumption power supply module; one end of the resistor R18 is connected to the output end of the low-power-consumption power supply module, the other end of the resistor R18 is grounded through a resistor R19, and a common connection point of the resistor R18 and the resistor R19 is connected with the inverting end of the comparator U1.

Further, the overvoltage protection circuit comprises an overvoltage judgment circuit and an overvoltage protection execution circuit;

the overvoltage judging circuit comprises a chip IC2, a capacitor C13, a resistor R22, a resistor R23, a resistor R24, a resistor R25 and a resistor R26;

the overvoltage protection execution circuit comprises an NMOS transistor Q5;

the chip IC2 is an ADCMP341 chip, a pin 7 of the chip IC2 is grounded through a capacitor C13, a common connection point between the capacitor C13 and the pin 7 of the chip IC2 is connected to a power supply end VO1 as a power supply input end of the chip IC2, one end of a resistor R25 is connected to a power supply end V01 as a detection input end of an overvoltage judging circuit, the other end of a resistor R25 is grounded after being connected in series with a resistor R22 through a resistor R26, a common connection point between a resistor R25 and a resistor R26 is connected with a pin 2 of the chip IC2, a common connection point between a resistor R26 and a resistor R22 is connected with a pin 3 of the chip IC2, one end of the resistor R23 is connected to the power supply end VO 23, the other end of the resistor R23 is connected with one end of the resistor R23, the other end of the resistor R23 is connected with a pin 1 of the chip IC 23, a pin 4 of the chip;

the grid electrode of the NMOS tube Q5 is used as the input end of the overvoltage protection execution circuit and is connected with the output end of the overvoltage judgment circuit, the source electrode of the NMOS tube Q5 is grounded, and the drain electrode of the NMOS tube Q5 is connected with the anode of the diode D1.

The utility model has the advantages that: through the utility model discloses, can follow and acquire the electric energy in the harmonic composition of vibration, temperature, electromagnetic environment, exciting current in the generator working process to need not to acquire the electric energy from the electric wire netting and provide the power consumption of stabilizing the work to the monitoring element of generator, thereby can effectively avoid the energy extravagant, reduce the circuit arrangement of electric wire netting power supply, practice thrift use cost.

Drawings

The invention will be further described with reference to the following figures and examples:

fig. 1 is an electrical block diagram of the present invention.

Fig. 2 is the schematic diagram of the structure of the induction power-taking module of the present invention.

Fig. 3 is the structural schematic diagram of the piezoelectric power-taking module of the present invention.

Fig. 4 is the utility model discloses a temperature difference is got electric module and is vibrated and get electric module structure sketch map.

Fig. 5 is a schematic view of the structure of the electric field power-taking module of the present invention.

Fig. 6 is a schematic circuit diagram of the energy harvesting circuit of the present invention.

Fig. 7 is a schematic diagram of the low power consumption power circuit of the present invention.

Fig. 8 is a schematic circuit diagram of the overvoltage judging circuit of the present invention.

Fig. 9 is a schematic circuit diagram of the comparison control circuit of the present invention.

Fig. 10 is a schematic circuit diagram of a reference circuit according to the present invention.

Detailed Description

The invention is described in further detail below with reference to the drawings in the specification:

the output that module and electric field were got to the electricity module is got in the response, piezoelectricity get the electricity module, the difference in temperature get the electricity module, vibrate and get the electricity module and the electric field is connected with power management module's input, power management module will respectively get the weak electric current of electricity module output and handle the stable direct current that forms and supply power to the load, through the utility model discloses, can follow and acquire the electric energy in vibration, temperature, electromagnetic environment, the harmonic composition of exciting current in the generator working process to need not to acquire the electric energy from the electric wire netting and provide the steady job power consumption to the monitoring element of generator, thereby can effectively avoid the energy extravagant, reduce the line arrangement of electric wire netting power supply, practice thrift.

In this embodiment, the piezoelectric material of the piezoelectric electricity taking module, the piezoelectric material 2 is disposed in the constant force spring 1 of the generator excitation carbon brush, as shown in fig. 3: the generator is provided with an excitation carbon brush, the carbon brush is combined with the rotor through a constant force spring (coil spring), in the working process of the generator, the carbon brush continuously vibrates under the influence of the thrust of the slip ring, so that the stress direction of the spring changes, the constant force spring is of a coil spring structure, the piezoelectric material is arranged on the coil spring, and along with the pressure of the coil spring, the piezoelectric material generates electric charges and outputs the electric charges.

In this embodiment, the thermoelectric power taking module is a thermoelectric power generation piece, the thermoelectric power generation piece is disposed on an excitation carbon brush of the power generator, a hot end 11 of the thermoelectric power generation piece is in contact with an excitation carbon brush 12, and a cold end 3 of the thermoelectric power generation piece is disposed on a brush holder handle 5 of the excitation carbon brush, as shown in fig. 4, where 13 is a brush holder and 10 is a brush holder handle support.

In this embodiment, the vibration power taking module includes two permanent magnets 7, two coils 6, two insulating tubes 9 and two springs 8, the two springs are respectively and fixedly disposed at two ends of the insulating tube, the coil is fixedly sleeved on the insulating tube, the permanent magnet is disposed in the insulating tube and located between the two springs, the insulating tube and the coil are disposed in the brush holder handle 5, as shown in fig. 5: the generator vibrates in the working process, so that the permanent magnet is driven to vibrate in the insulating tube, namely the permanent magnet reciprocates along the insulating tube, and the movement of the permanent magnet induces current in the coil and outputs the current through the electromagnetic induction principle.

In this embodiment, the electric field power taking module includes two polar plates 4, the two polar plates 4 are opposite to each other and are fixedly disposed on a brush holder handle 5 of the generator, as shown in fig. 6, the two polar plates form a capacitor for generating electric quantity by an electric field formed by electric charges in the environment, and the electric quantity is weak, but can still be utilized by subsequent circuit processing after being output.

In this embodiment, the induction power-taking module and the excitation coil of the generator are provided with the current transformer, and then rectified by the rectifying circuit to output direct current, the rectifying circuit is a full-bridge rectifying circuit composed of ideal diodes, the self loss of the full-bridge rectifying circuit is within 0.1V when 10A current passes through, the influence on the circuit can be ignored, wherein, the excitation current is a direct current, but, harmonic components are contained in the direct current, the current transformer collects harmonic components in the excitation current, the current transformer CT1 and the rectifying circuit compose the induction power-taking module, and the anode of the diode D1 is the output end connection point of all the power-taking modules.

In this embodiment, although the whole power-taking system has a plurality of power-taking modules, the current output by each power-taking module is very weak, and thus the weak current needs to be fully utilized after being processed by the power management circuit.

The power management module comprises an energy collection circuit, a low-power-consumption power circuit, a comparison control circuit and an overvoltage protection circuit;

the overvoltage protection circuit is used for detecting an input voltage signal of the energy collection circuit and performing overvoltage protection on a rear end circuit of the electric energy acquisition circuit when a voltage value is larger than a safety threshold value, by the structure, weak currents can be fully collected and stable direct current can be provided for a load, although output currents of all power taking modules are very weak, the situation of overhigh voltage still exists based on certain sudden states, therefore, the overvoltage protection circuit can protect subsequent circuits and has the situation of overhigh voltage, the output voltage of each module still has the situation of lower voltage, power supply is stopped when the output voltage of the low-power-consumption power supply circuit is lower than a set value through the comparison control circuit, and therefore the situation that monitoring is unstable due to the fact that an electric device works in an undervoltage state is prevented.

In this embodiment, the low power consumption power module includes a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a capacitor C9, a capacitor C10, an NMOS transistor Q6, a PMOS transistor Q7, and a diode D2;

the drain electrode of the PMOS tube Q7 is connected with the anode of the diode D2 after being connected in series through the resistor R14 and the resistor R15, the cathode of the diode D2 is connected with the grid electrode of the NMOS tube Q6, and the common connection point between the anode of the diode D2 and the resistor R15 is used as the control input end of the low-power-consumption power supply module; when the circuit starts to work, the voltage of the capacitor C9 is very low, at this time, because the voltage value obtained by the grid of the NMOS tube Q6 is very small, and because the on-resistance of the NMOS tube Q6 is large, and by setting the resistance values of the resistors R8-R13 (the resistance values are generally in the megaohm range), the NMOS transistor Q6 is cut off, the PMOS transistor Q7 is also cut off, therefore, the leakage current is extremely small, the self-loss of the circuit is reduced, the discharge time of the capacitor C6 is delayed, therefore, energy loss is prevented, as the voltage of the capacitor C9 gradually rises, the gate voltage of the NMOS transistor Q6 gradually rises until the NMOS transistor Q6 is turned on, at the moment, the gate voltage of the PMOS transistor Q7 is pulled low, thereby, the PMOS transistor Q7 is conducted, the grid of the NMOS transistor Q6 is supplied with power by superposition through the resistor R14, the resistor R15 and the diode D2, therefore, the NMOS transistor Q6 will be in continuous conduction, and the PMOS transistor Q7 will also be in continuous conduction, ensuring the continuity of the power supply time.

In this embodiment, the energy collection module includes a chip IC1, a lithium battery BAT1, a capacitor C2, a capacitor C3, a lithium battery BAT2, a capacitor C6, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an inductor L1, a PMOS transistor Q1, a PMOS transistor Q2, a PMOS transistor Q3, and a PMOS transistor Q4;

an 8 pin of the chip IC1 is grounded after being connected in series with a resistor R1 and the resistor R1, a common connection point between the resistor R1 and the resistor R1 is connected with a 7 pin of the chip IC1, an 8 pin of the chip IC1 is connected with one end of the resistor R1 through the resistor R1, the other end of the resistor R1 is grounded through the resistor R1, a common connection point between the resistor R1 and the resistor R1 is connected with an 11 pin of the chip IC1, a common connection point between the resistor R1 and the resistor R1 is connected with a 12 pin of the chip IC1, pins 3 and 19 of the chip IC1 are connected with a source of the PMOS Q1, a source of the PMOS Q1 is grounded through a capacitor C1, a drain of the PMOS Q1 is connected with a source of the PMOS Q1, a pin 18 pin of the chip IC1 is connected with an anode of the lithium battery BAT1, a drain of the PMOS Q1 is connected with a drain of the PMOS Q1, and a drain of the PMOS Q1 is connected with a drain of the PMOS Q1 through the PMOS transistor 1. The common connection point between the drain of the PMOS tube Q4 and the capacitor C6 is used as the output end of the energy collection module, the grid of the PMOS tube Q1 and the grid of the PMOS tube Q2 are connected to the 9 pins of the chip IC1, the grids of the PMOS tube Q3 and the PMOS tube Q4 are connected to the 10 pins of the chip IC1, and the 14 pins of the chip IC1 are connected with the positive electrode of the lithium battery BAT 2. The 11 pins and 12 pins, R3, R4 and R5 of the chip IC1 set the working range of the battery voltage; the voltage of a 19 pin of the chip IC1 is sampled by a 3 pin of the chip IC1, when the voltage of the lithium battery BAT1 is higher than a set threshold value, a 9 pin of the chip IC1 is at a low level, a 14 pin of the chip IC1 is at a high level, and the PMOS tube Q1 and the PMOS tube Q2 are conducted; when the lithium battery BAT1 is lower than a set threshold value, the 9 pin of the chip IC1 is at a high level, the 14 pin of the chip IC1 is at a low level, the PMOS tube Q3 and the PMOS tube Q4 are conducted, and the lithium battery BAT2 supplies power to a load; the 20 pins of the chip IC1 can effectively extract energy from the power acquisition module to charge the lithium battery BAT1 connected to the 18 pins of the chip IC 1; lithium battery BAT1 and lithium battery BAT2 work alternately.

In the embodiment, the circuit comprises a reference circuit, a comparator U1, a resistor R16, a resistor R17, a resistor R18, a resistor R19 and a resistor R20;

the comparator is a TLV3961 comparator, the in-phase end of the comparator U1 is connected with the output end of the reference circuit through a resistor R16, the in-phase end of the comparator U1 is connected with the output end of the comparator U1 through a resistor R17, the output end of the comparator U1 is connected with one end of a resistor R20, the other end of the resistor R20 is connected with the base of a triode Q8, the emitter of a triode Q8 is grounded, and the collector of the triode Q8 is used as the control output end of the comparison control circuit and connected with the control input end of the low-power-consumption power supply module, namely the common connection point between a diode D2 and the resistor R15; one end of the resistor R18 is connected to the output end of the low-power-consumption power supply module, the other end of the resistor R18 is grounded through a resistor R19, and a common connection point of the resistor R18 and the resistor R19 is connected with the inverting end of the comparator U1. Because the input current of the whole power supply system is weak, when the input current is not enough to continuously meet the subsequent power consumption voltage requirement, if the low-power consumption power supply module supplies power to subsequent loads, the loads are in an undervoltage working state, which cannot accurately output the power to the loads such as a temperature sensor and a vibration sensor, when the output voltage of the low-power-consumption power supply module is lower than a set value, the comparator U1 outputs high level, the triode Q8 is conducted, the positive electrode potential of the diode D2 is pulled low, so that the grid voltage of the NMOS tube Q6 of the low-power-consumption power supply module is pulled low and cut off, therefore, the PMOS tube Q7 is cut off, the low-power consumption power supply module has no output, the conduction of the triode Q8 accelerates the discharge of the capacitor C10, reduces the grid voltage of the NMOS tube Q6, and leads the NMOS tube Q6 to be cut off rapidly, thereby clamping and protecting the subsequent circuit, wherein the reference circuit adopts a REF33 series reference circuit.

In this embodiment, the overvoltage protection circuit includes an overvoltage judgment circuit and an overvoltage protection execution circuit;

the overvoltage protection execution circuit comprises an NMOS transistor Q5;

Although the input current of the whole system is small, the situation of sudden voltage fluctuation is inevitable due to the influence of the use environment and the like, if the voltage peak value is too large, the subsequent circuit is damaged, and the subsequent circuit can be effectively protected by the structure; the hysteresis comparator is formed by the IC2, the resistor R22, the resistor R25 and the resistor R26, when the hysteresis comparator is normal, a pin 1 of the IC2 outputs a low level, the NMOS tube Q5 does not act, when the output voltage of the electric energy acquisition circuit is higher than a voltage safety threshold value, the chip IC2 outputs a high level, so that the NMOS tube Q5 is conducted, the voltage of the electric energy acquisition module is pulled down through the resistor R7, and the resistor R7 is a small-resistance high-power resistor and is used for consuming energy generated by overvoltage, so that a follow-up circuit is protected from being damaged due to overhigh voltage; in order to indicate the overvoltage protection in the implementation process, an indicating circuit is further arranged, the indicating circuit comprises a resistor R6 and a light emitting diode ED1, the anode of the light emitting diode ED1 is connected to the anode of a diode D1 through a resistor R6, the cathode of the light emitting diode ED1 is connected with the drain of an NMOS tube Q5, when an NMOS tube Q5 is conducted, the potential of the anode of the diode D1 is pulled down, overvoltage protection is achieved, a power supply loop of the light emitting diode DE1 is conducted, and the light emitting diode ED1 works and emits light.

Certainly, the charging and discharging of the lithium battery are controlled by a lithium battery management circuit, the lithium battery management circuit adopts the existing control chip, and a manufacturer directly attaches the battery management circuit when purchasing.

Finally, 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 the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. An online electricity taking system for monitoring a generator is characterized in that: the power supply system comprises a current transformer for taking power from an excitation circuit of a generator, a piezoelectric power taking module for taking power from an excitation carbon brush of the generator, a temperature difference power taking module for taking power from a carbon brush of the generator, a vibration power taking module for taking power from a handle of the generator in a vibration mode, an electric field power taking module based on an environmental electric field and a power supply management module;

the output ends of the current transformer, the piezoelectric power taking module, the temperature difference power taking module, the vibration power taking module and the electric field power taking module are connected with the input end of the power management module, and the power management module processes weak current output by each power taking module to form stable direct current to supply power to a load.

2. An on-line electricity taking system for monitoring generator according to claim 1, characterized in that: the piezoelectric electricity taking module is made of piezoelectric materials, and the piezoelectric materials are arranged on a constant force spring of the generator excitation carbon brush.

3. An on-line electricity taking system for monitoring generator according to claim 1, characterized in that: the thermoelectric power taking module is a thermoelectric power generation piece, the thermoelectric power generation piece is arranged on an excitation carbon brush of the generator, the hot end of the thermoelectric power generation piece is in contact with the excitation carbon brush, and the cold end of the thermoelectric power generation piece is arranged on a brush holder handle of the excitation carbon brush.

4. An on-line electricity taking system for monitoring generator according to claim 1, characterized in that: the vibration electricity taking module comprises two springs, a permanent magnet, a coil, an insulating tube and springs, the two springs are fixedly arranged at two ends of the insulating tube respectively, the coil is fixedly sleeved outside the insulating tube, the permanent magnet is arranged in the insulating tube and located between the two springs, and the insulating tube and the coil are arranged in the brush holder handle.

5. An on-line electricity taking system for monitoring generator according to claim 1, characterized in that: the electric field power taking module comprises two polar plates which are arranged just opposite to each other and fixedly arranged on a brush holder handle of the generator.

6. An on-line electricity taking system for monitoring generator according to claim 1, characterized in that: the power management module comprises an energy collection circuit, a low-power-consumption power circuit, a comparison control circuit and an overvoltage protection circuit;

7. An on-line electricity taking system for monitoring generator according to claim 6, wherein: the low-power-consumption power module comprises a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a capacitor C9, a capacitor C10, an NMOS tube Q6, a PMOS tube Q7 and a diode D2;

8. An on-line electricity taking system for monitoring generator according to claim 6, wherein: the energy collection module comprises a chip IC1, a lithium battery BAT1, a capacitor C1, a capacitor C2, a capacitor C3, a lithium battery BAT2, a capacitor C6, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an inductor L1, a PMOS tube Q1, a PMOS tube Q2, a PMOS tube Q3 and a PMOS tube Q4;

9. An on-line electricity taking system for monitoring generator according to claim 6, wherein: the comparison control circuit comprises a reference circuit, a comparator U1, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20 and a triode Q8;

10. An on-line electricity taking system for monitoring generator according to claim 6, wherein: the overvoltage protection circuit comprises an overvoltage judging circuit and an overvoltage protection execution circuit;

the overvoltage protection execution circuit comprises an NMOS transistor Q5;