Power supply circuit of shaft end power generation device

Abstract

The utility model discloses a power supply circuit of a shaft end power generation device, which comprises the shaft end power generation device, an AD / DC conversion module, a voltage detection module, an output control module, a battery pack, an MCU controller and a DC / DC conversion module, the output end of the shaft end power generation device is connected with the battery pack through the AD / DC conversion module; the input end of the output control module is connected with the output end of the battery pack, the control end is connected with the MCU controller, and the output end is connected with the input end of the DC / DC conversion module; the voltage detection module comprises a power generation rectification voltage detection circuit, a battery pack charging voltage detection circuit and a battery pack discharging voltage detection circuit. The power generation rectification voltage detection circuit, the battery pack charging voltage detection circuit and the battery pack discharging voltage detection circuit are all connected with the MCU controller. The utility model has the advantages of simple structure, low cost, high efficiency, reliability, stable voltage output and the like.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of railway freight cars, and in particular to a power supply circuit for an axle end power generation device. Background Art

[0002] Railway freight cars are characterized by heavy loads and long formations. At present, exploring health management, how to transform "periodic maintenance" into "precision maintenance" and realize flexible vehicle formation has become the focus of attention. In the current research, the on-board self-generating system of railway freight cars can convert the vibration energy in the surrounding environment into usable electrical energy, which provides the possibility for realizing "precision maintenance" and "flexible formation" of vehicles. Among them, the axle-end power generation device of railway freight cars is one of the forms of on-board self-generating systems. Compared with traditional electrostatic, electromagnetic and piezoelectric types, its high efficiency power generation rate and convenient structure are more suitable for vehicle power supply systems. However, how to design a micro-control circuit to realize the efficient conversion and utilization of the energy collected by the axle-end power generation device to meet the safe and reliable operation of the vehicle's low-power system has become an urgent problem to be solved.

[0003] In addition, railway freight cars also have the following shortcomings:

[0004] 1. Unable to conduct real-time data monitoring

[0005] Railway freight cars have a complex operating environment, and their status monitoring has become a focus of attention in the industry. However, railway freight cars themselves have no power supply conditions, and it is impossible to monitor the status of low-power systems (such as wind pressure sensors, etc.) and complete data collection and upload them to the terminal for query.

[0006] 2. Energy cannot be converted efficiently

[0007] At present, the output signal of the shaft-end generator is AC voltage, and it is a non-standard sine wave. The power supply target belongs to the DC drive system. At this time, the AC voltage needs to be converted into DC voltage. The fact is that the AC voltage signal has a negative half-cycle signal. If this part of the energy cannot be effectively utilized, the system energy conversion efficiency will be greatly reduced.

[0008] 3. The DC system operation is not reliable

[0009] The voltage value varies at different times, and the energy storage module that supplies power to low-power loads has certain challenges in charge and discharge management and control. Therefore, in the face of different working modes, how to adjust the charge and discharge state of the energy storage module to improve power supply reliability and maintain stable operation of the DC system has become a major consideration. Utility Model Content

[0010] The technical problem to be solved by the utility model is: in view of the technical problems existing in the prior art, the utility model provides a power supply circuit for a shaft end power generation device which has a simple structure, low cost, high efficiency and reliability, and stable voltage output.

[0011] In order to solve the above technical problems, the technical solution proposed by the utility model is:

[0012] A power supply circuit for a shaft-end power generation device, comprising a shaft-end power generation device, an AD / DC conversion module, a voltage detection module, an output control module, a battery pack, an MCU controller and a DC / DC conversion module; the output end of the shaft-end power generation device is connected to the battery pack via the AD / DC conversion module;

[0013] The input end of the output control module is connected to the output end of the battery pack, the control end is connected to the MCU controller, and the output end is connected to the input end of the DC / DC conversion module;

[0014] The voltage detection module includes a power generation rectifier voltage detection circuit, a battery pack charging voltage detection circuit and a battery pack discharge voltage detection circuit; one end of the power generation rectifier voltage detection circuit is connected to the rectifier filter output end, and the other end is connected to the MCU controller; one end of the battery pack charging voltage detection circuit is connected to the output end of the AD / DC conversion module, and the other end is connected to the MCU controller; one end of the battery pack discharge voltage detection circuit is connected to the battery pack, and the other end is connected to the MCU controller.

[0015] As a further improvement of the above technical solution:

[0016] It also includes a speed signal processing module, the input end of the speed signal processing module is connected to the output end of the shaft end power generation device, and the output end of the speed signal processing module is connected to the MCU controller.

[0017] The speed signal processing module includes a diode D17, resistors R17-R20, R23-R30, capacitors C28-C30, and amplifiers U1-U2; D17 is grounded via R18 and R19 in sequence; the in-phase input terminal of U1 is connected to the common point of R18 and R19 via a resistor R25; one end of R27 and C29 is grounded, and the other end is connected to the in-phase input terminal of U1; the inverting input terminal of U1 is grounded via R20, and connected to the output terminal of U1 via R17; the output terminal of U1 is connected to the inverting input terminal of U2 via R24, and connected to the power supply via R23; the inverting input terminal of U2 is grounded via C28; the in-phase input terminal of U1 is connected to the power supply via R29, and is grounded via R30 and C30 respectively; the output terminal of U1 is connected to resistor R26.

[0018] The AD / DC conversion module comprises a rectifier and filter circuit and a voltage stabilizing circuit; the output end of the rectifier and filter circuit is connected to the input end of the voltage stabilizing circuit.

[0019] The rectification and filtering circuit comprises a plurality of full-wave rectification bridges connected in parallel.

[0020] The voltage stabilizing circuit includes a voltage stabilizing chip, capacitors C31-C34, C38, diodes D20, D21, D22, D23, resistors R31, R32, R33, R36, R37, R39, R40, R41, R42, and an inductor L1;

[0021] After C31 and C32 are connected in parallel, one end is connected to the output end of the rectifier filter circuit and the DRV end of the voltage regulator chip, and the other end is grounded;

[0022] The positive electrode of D20 is connected to one end of C34 and grounded, the negative electrode of D20 is connected to the other end of C34 and connected to one end of R33, and the other end of R33 is connected to the output end of the rectifier filter circuit;

[0023] The negative electrode of D23 is connected to one end of R33 via R36, and the negative electrode of D23 is connected to the VSN end of the voltage regulator chip via the inductor;

[0024] One end of C38 is connected to the VCC end of the voltage regulator chip, and the other end of C38 is grounded;

[0025] The VFB1 terminal of the voltage regulator chip is grounded via a resistor R41, and is connected to the VSN terminal of the voltage regulator chip via R42 and L1 in sequence;

[0026] The VFB2 end of the voltage regulator chip is grounded via R39 and R40 respectively;

[0027] The VSS and VSN terminals of the voltage regulator chip are connected and grounded, and are grounded to the VSP terminal of the voltage regulator chip through R31 and R32 respectively;

[0028] The cathode of D21 and D22 is connected to the VSP terminal of the voltage regulator chip, and the anode is grounded; one end of C33 and R37 is grounded, and the other end is connected to the VSN terminal of the voltage regulator chip.

[0029] It also includes a diode D19, and the positive electrode of D19 is connected to the VSN terminal of the voltage regulator chip through L1.

[0030] The DC / DC conversion module includes a 24V to 3.3V circuit, a 24V to 12V circuit and a 24V to 15V circuit.

[0031] The 24V to 3.3V circuit includes a LM2596 chip, capacitors C25-C27 and a diode D18;

[0032] Capacitor C27 is an energy storage capacitor connected to the battery pack voltage output control terminal;

[0033] The negative end of diode D18 is connected to the Output pin of the LM2596 chip, and the positive end is grounded;

[0034] One end of the inductor L3 is connected to the negative end of the diode D18, and the other end is connected to one end of the capacitors C25 and C26; the other ends of the capacitors C25 and C26 are grounded.

[0035] It also includes a communication module, which is connected to the MCU controller.

[0036] Compared with the prior art, the advantages of the utility model are:

[0037] The utility model aims at the current status of the micro-control circuit of the rear end power supply of the shaft end power generation device, which needs to realize the efficient conversion and utilization of the collected energy and solve the problem of safe and reliable operation of the low-power consumption system of railway freight cars. A power supply circuit and control method of the shaft end power generation device are proposed. The shaft end power generation device is used to collect the mechanical energy of the rotation speed to realize the power supply of the low-power consumption system of the freight car, thereby saving energy costs; its simple structure also reduces the wiring and management costs of the vehicle and improves the reliability of flexible formation; it is equipped with a forced power supply interface to enhance the working reliability of the MCU controller; the rotation speed is used as a pulse trigger signal to control the wind pressure sensor, and the condition priority is set to maintain the balance and stability of the entire system; a two-way redundant design method is used to correspond to multiple power application conditions to maintain the stable operation of the DC system, improve the railway freight car power management system, and realize railway freight car status data monitoring and query; the utility model plays an important role in improving the reliability of flexible formation of railway freight cars, reducing daily operation and management costs, and improving the railway freight car power management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a topological structure diagram of the rear end power supply system of the shaft end power generation device of the utility model in an embodiment.

[0039] Figure 2 The following are circuit diagrams of an AD / DC conversion module of the utility model in an embodiment; (a) is a circuit diagram of a rectifier and filter circuit; and (b) is a circuit diagram of a voltage stabilization circuit.

[0040] Figure 3 The schematic diagram of the circuit of the DC / DC conversion module of the utility model in the embodiment; wherein (a) is a 24V to 3.3V circuit; (b) is a 24V to 12V circuit; and (c) is a 24V to 15V circuit.

[0041] Figure 4 The circuit diagram of the voltage detection module of the utility model in an embodiment; wherein (a) is a power generation rectification voltage detection circuit; (b) is a battery pack discharge voltage detection circuit; and (c) is a battery pack charge voltage detection circuit.

[0042] Figure 5 This is a circuit diagram of a speed signal processing module in an embodiment of the utility model.

[0043] Legend: 1. Shaft end power generation device; 2. AD / DC conversion module; 3. Voltage detection module; 4. Output control module; 5. Battery pack; 6. MCU controller; 7. Communication module; 8. Speed ​​signal processing module; 9. DC / DC conversion module. DETAILED DESCRIPTION

[0044] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] like Figure 1 As shown, the power supply circuit of the shaft end power generation device of the embodiment of the utility model includes an AC input end (shaft end power generation device 1), an AD / DC conversion module 2, a voltage detection module 3, an output control module 4, a battery pack 5, an MCU controller 6, a communication module 7, a speed signal processing module 8 and a DC / DC conversion module 9;

[0046] The AC input end is the shaft end power generation device 1, which can recover the mechanical energy of the railway truck wheel axle speed. The AC voltage it generates can be converted into a DC voltage for the low-power system to operate through the AD / DC conversion module 2; when the speed voltage is generated, the battery pack 5 is operated to realize charging;

[0047] The AD / DC conversion module 2 includes two parts: a rectifier filter circuit and a voltage stabilization circuit; the rectifier filter circuit is a full-wave rectifier bridge; the full-wave rectifier bridge converts the input AC signal into a DC signal with the same polarity. In addition, the full-wave rectifier bridge can also reduce the fluctuation of the output voltage, making the output voltage more stable. Through the full-wave rectifier bridge, the negative half cycle of the AC signal can also be effectively utilized, thereby improving the efficiency of the power supply.

[0048] The voltage detection module 3 includes a power generation rectifier voltage detection circuit, a battery pack 5 charging voltage detection circuit and a battery pack 5 discharge voltage detection circuit; one end of the power generation rectifier voltage detection circuit is connected to the output end of the rectifier filter circuit, and the other end is connected to the MCU controller 6; one end of the battery pack 5 charging voltage detection circuit is connected to the output end of the voltage stabilizing circuit, and the other end is connected to the MCU controller 6; one end of the battery pack 5 discharge voltage detection circuit is connected to the battery pack 5, and the other end is connected to the MCU controller 6.

[0049] The output control circuit is used to control the power output as a whole, wherein the input end is connected to the output end of the battery pack 5 , the control end is connected to the MCU controller 6 , and the output end is connected to the input end of the DC / DC conversion module 9 .

[0050] The battery pack 5 is used to store the power generated by the energy collection end. It uses its own BMS battery and has built-in power supply control conditions. According to the operation requirements, the battery pack 5 releases the power and performs the corresponding voltage conversion. When the shaft end power generation device 1 generates a speed voltage, the battery pack 5 operates to charge and supplies power to the data monitoring query end and the wind pressure signal end; in addition, when one of the data monitoring query end and the wind pressure signal end generates a demand signal, the battery pack 5 can operate to discharge; if the shaft end power generation device 1 generates no speed voltage, the data monitoring query end has no data communication requirements, and the wind pressure signal end has no demand signal, the battery pack 5 stops running.

[0051] The MCU controller 6 is responsible for coordinating the normal operation of each component module and the query terminal, such as voltage acquisition, pulse triggering, forced power supply debugging, serial port data interaction, data monitoring query terminal 485 communication, AD acquisition and control signal output, etc. In addition, the battery pack 5 will output 24V voltage, which is converted into 3.3V by the DC / DC conversion module 9 to provide power to the MCU controller 6.

[0052] The communication module 7 adopts 485 communication mode, which is mainly used for data collection to realize real-time status monitoring so that the client can record and query. The power input end of the communication module 7 is connected to the DC / DC conversion module 9 to obtain the starting voltage 3.3V, and the communication interface end is connected to the MCU controller 6 to obtain relevant instructions.

[0053] The input end of the speed signal processing module 8 is connected to the output end of the shaft end power generation device 1, and the AC speed signal is amplified after voltage reduction, and then outputs a square wave in a hard-cut amplification manner; the output end of the speed signal processing module 8 is connected to the MCU controller 6, and the speed information is processed by the MCU controller 6 and then outputted. The power supply of the speed signal processing module 8 is still provided by the DC / DC conversion module 9 (24V to 3.3V).

[0054] The DC / DC conversion module 9 mainly has three voltage standards: 24V to 3.3V, 24V to 12V and 24V to 15V. The 24V to 12V circuit and the 24V to 15V circuit are both designed with two redundant paths, ensuring the system power supply stability and power supply multi-application selectivity.

[0055] In specific applications, the AC voltage generated by the shaft end power generation device 1 is rectified, filtered and voltage-stabilized by the AD / DC conversion module 2, and the output is a standard 24V DC to charge the battery pack 5;

[0056] When the capacity of the battery pack 5 is lower than 20%, the discharge is stopped; at the same time, the AC input terminal is detected to be working normally to output the rectified voltage. When the output voltage of the rectifier terminal is detected and the charging capacity of the battery pack 5 is higher than 30%, the battery pack 5 will resume power supply;

[0057] When the shaft end power generation device 1 generates a rotating speed AC voltage, the battery pack 5 operates to realize charging and supplies power to the data monitoring query terminal and the wind pressure signal terminal;

[0058] In addition, when a demand signal is sent from either the data monitoring and query end or the wind pressure signal end, the battery pack 5 can operate to discharge; if the shaft end generator 1 does not send a speed voltage, the data monitoring and query end has no data communication requirements, and the wind pressure signal end has no demand signal, the battery pack 5 stops operating.

[0059] The objects powered by the battery pack 5 are mostly low-power modules, and the voltage conversion value configured therein is determined according to the operational requirements.

[0060] The speed signal processing module 8, MCU controller 6 and 485 communication power supply of the data monitoring query terminal come from the 24V to 3.3V DC / DC conversion module 9. In addition, according to the requirements of multiple applications, a 24V to 15V and 24V to 12V DC / DC conversion circuit is configured in a two-way redundant design to provide power to the wind pressure sensor, Beidou device and client.

[0061] The speed is used as a pulse trigger signal to control the data collection state of the wind pressure sensor. When the shaft-end power generation device 1 works and outputs the speed, the wind pressure sensor starts the information collection function and transmits the data back to the MCU controller 6. The MCU controller 6 transmits the data to the client terminal through the 485 communication mode for query. The output control circuit controls the 15V and 12V voltage standard output according to the communication requirements of the data monitoring query end and the demand signal conditions of the wind pressure signal end. In addition, in order to enhance the reliability of the MCU controller 6, a forced power supply interface is configured.

[0062] The utility model aims at the current status of the micro-control circuit of the rear end power supply of the shaft end power generation device 1, which needs to realize the efficient conversion and utilization of the collected energy and solve the problem of safe and reliable operation of the low-power consumption system of railway freight cars. A power supply circuit and control method of the shaft end power generation device 1 are proposed. The shaft end power generation device 1 is used to collect the mechanical energy of the rotation speed to realize the power supply of the low-power consumption system of the freight car, thereby saving energy costs; its simple structure also reduces the wiring and management costs of the vehicle and improves the reliability of flexible formation; it is equipped with a forced power supply interface to enhance the working reliability of the MCU controller 6; the rotation speed is used as a pulse trigger signal to control the wind pressure sensor, and the condition priority is set to maintain the balance and stability of the entire system; a two-way redundant design method is used to correspond to multiple power application conditions to maintain the stable operation of the DC system, improve the railway freight car power management system, and realize railway freight car status data monitoring and query; the utility model plays an important role in improving the reliability of flexible formation of railway freight cars, reducing daily operation and management costs, and improving the railway freight car power management system.

[0063] In a specific embodiment, if Figure 2As shown in (a), the full-wave rectifier bridge is a two-way redundant design, with four diodes D5, D6, D7 and D9 forming one way, and four diodes D13, D14, D15 and D16 forming another way. When the input AC voltage is positive, diodes D5 and D9 in the rectifier bridge are turned on, D13 and D16 are turned on, the current flows from the input end to the output end, and the voltage at the output end is positive; when the input AC voltage is negative, D6 and D7 in the rectifier bridge are turned on, D14 and D15 are turned on, the current flows from the input end to the output end, and the voltage at the output end is still positive; the negative half cycle of the AC signal is effectively utilized through the full-wave rectifier bridge, thereby improving the energy conversion efficiency.

[0064] In a specific embodiment, a full-wave rectifier bridge is connected to a filter circuit, wherein a storage capacitor C11 is connected in parallel with a bypass capacitor C12; and a storage capacitor C23 is connected in parallel with a bypass capacitor C24 to filter out the AC component, thereby obtaining a smooth DC voltage.

[0065] like Figure 2 As shown in (b), the voltage stabilizing circuit is connected to the output end of the rectifier and filter circuit to make the output voltage more stable. Specifically, the voltage stabilizing circuit also includes two paths and is redundant with each other. One of the voltage stabilizing circuits includes a voltage stabilizing chip (SL3038 model chip is selected), capacitors C31-C34, C38, diodes D20, D21, D22, D23, resistors R31, R32, R33, R36, R37, R39, R40, R41, R42, and inductor L1; after C31 and C32 are connected in parallel, one end is connected to the output end of the rectifier and filter circuit and the DRV end of the voltage stabilizing chip, and the other end is grounded; the positive pole of D20 is connected to one end of C34 and grounded, the negative pole of D20 is connected to the other end of C34 and connected to one end of R33, and the other end of R33 is connected to the output end of the rectifier and filter circuit; the negative pole of D23 is connected to the output end of the rectifier and filter circuit through R36 Connected to one end of R33, the negative electrode of D23 is connected to the VSN end of the voltage regulator chip through the inductor; one end of C38 is connected to the VCC end of the voltage regulator chip, and the other end of C38 is grounded; the VFB1 end of the voltage regulator chip is grounded through the resistor R41, and is connected to the VSN end of the voltage regulator chip through R42 and L1 in turn; the VFB2 end of the voltage regulator chip is grounded through R39 and R40 respectively; the VSS and VSN ends of the voltage regulator chip are connected and grounded, and are grounded to the VSP end of the voltage regulator chip through R31 and R32 respectively; the negative electrodes of D21 and D22 are connected to the VSP end of the voltage regulator chip, and the positive electrodes are grounded; one end of C33 and R37 is grounded, and the other end is connected to the VSN end of the voltage regulator chip.

[0066] In specific applications, the large-capacity electrolytic capacitor C32 at the input end is connected in parallel with the bypass capacitor C31. The electrolytic capacitor C32 provides a transient large current for the chip, and the bypass capacitor C31 eliminates high-frequency noise signals to make the chip work more stably; the resistor R33 and R36 are set to provide input signals for the SL3038 chip U8; the bypass capacitor C34 is connected in parallel with the voltage-stabilizing diode D20 to achieve the stability and clamping protection of the chip power supply voltage; the bypass capacitor C38 is connected between the VCC pin and the ground to achieve grounding protection and voltage stabilization, and is connected to the voltage-dividing resistors R41, R42, R39, and R40 at the VFB1 and VFB2 pins. Set the output voltage; resistors R31 and R32 are connected in parallel between the VSP and VSN pins to set the maximum output current; MOS tube U7 is connected to the DRV pin as a switching device. When VDD reaches 6V, DRV drives the MOS tube to turn on. When the voltage between resistors R31 and R32 reaches 0.15V, DRV turns off the MOS tube; the inductor L1 releases the current through the load resistor R37 and the freewheeling diodes D21 and D22 to form the main power circuit; the large-capacity electrolytic capacitor C33 at the output end is connected in parallel with the load resistor R37 to achieve filtering and voltage stabilization; the diode D19 is connected to the load output end to achieve circuit protection.

[0067] The second path is the same as above. The large-capacity electrolytic capacitor C40 at the input end is connected in parallel with the bypass capacitor C39. The electrolytic capacitor C40 provides a transient large current for the chip, and the bypass capacitor C20 eliminates high-frequency noise signals to make the chip work more stably; the resistor R50 and R52 voltage divider is set to provide the input signal for the SL3038 chip U10; the bypass capacitor C42 is connected in parallel with the voltage stabilizing diode D25 to achieve the stability and clamping protection of the chip power supply voltage; the bypass capacitor C43 is connected between the VCC pin and the ground to achieve grounding protection and voltage stabilization, and is connected to the voltage divider resistors R60, R61, R58, and R59 at the VFB1 and VFB2 pins. Set the output voltage; resistors R48 and R49 are connected in parallel between the VSP and VSN pins to set the maximum output current; MOS tube U9 is connected to the DRV pin as a switching device. When VDD reaches 6V, DRV drives the MOS tube to turn on. When the voltage between resistors R48 and R49 reaches 0.15V, DRV turns off the MOS tube; the inductor L2 releases the current through the load resistor R53 and the freewheeling diodes D26 and D27 to form the main power circuit; the large-capacity electrolytic capacitor C41 at the output end is connected in parallel with the load resistor R53 to achieve filtering and voltage stabilization; the diode D24 is connected to the load output end to achieve circuit protection.

[0068] Correspondingly, the power generation rectifier voltage detection circuit is composed of 4 voltage-dividing resistors. To facilitate the detection of the rectifier voltage, it is reduced by 100 times. Resistors R2 and R5 are connected in series for voltage division, one end of R2 is connected to the output end of the rectifier filter circuit, and the other end is connected to resistor R1, and resistors R1 and R4 are connected in series for voltage division, and the voltage-dividing output end is connected to the MCU controller 6 as the voltage detection end. Similarly, resistors R13 and R16 are connected in series for voltage division, one end of R13 is connected to the output end of the rectifier filter circuit, and the other end is connected to resistor R12, and resistors R12 and R15 are connected in series for voltage division, and the voltage-dividing output end is connected to the MCU controller 6 as the voltage detection end.

[0069] In a specific embodiment, if Figure 3 As shown, the DC / DC conversion module 9 mainly includes a 24V to 3.3V circuit, a 24V to 12V circuit and a 24V to 15V circuit;

[0070] like Figure 3 As shown in (a), the 24V to 3.3V circuit uses the LM2596 chip. The input electrolytic capacitor C27 is an energy storage capacitor connected to the voltage output control terminal of the battery pack 5. The diode D18 is connected to the Output pin to prevent the subsequent surge voltage from damaging the previous circuit and play a clamping protection role. The inductor L3 is connected to the negative end of the diode D18 to filter out the current ripple; the output electrolytic capacitor C25 is connected in parallel with the bypass capacitor C26 to filter out the voltage ripple and achieve output voltage stability.

[0071] like Figure 3 As shown in (b), the 24V to 12V circuit uses the TPS5430 chip and adopts a two-way redundant design. In the first way, the input decoupling capacitors C7 and C8 are connected in parallel to the VIN pin, and the startup capacitor C2 and the inductor L4 between the BOOT pin and the PH pin form an output filter. Because the output stage circuit contains inductive devices, surge voltage is prone to damage the previous stage circuit, so a voltage regulator D4 is added at the PH pin to form a clamping circuit to protect the circuit. The output electrolytic capacitor C9 is connected in parallel with the bypass capacitor C10 to filter out the voltage ripple and achieve output voltage stability. The voltage divider resistors R6 and R8 connected to the VSENSE pin can set the output voltage, and the value-taking diode D2 is connected to the voltage output end to achieve circuit protection. In the second way, the voltage divider resistors R10 and R14 connected to the VSENSE pin can set the output voltage, and the diode D10 is connected to the voltage output end to achieve circuit protection.

[0072] like Figure 3As shown in (c), the 24V to 15V circuit uses the TPS5430 chip and adopts a two-way redundant design. In the first way, the input decoupling capacitors C3 and C4 are connected in parallel to the VIN pin, and the startup capacitor C1 and the inductor L6 between the BOOT pin and the PH pin form an output filter. Because the output stage circuit contains inductive devices, surge voltage is prone to damage the previous stage circuit, so a voltage regulator D3 is added at the PH pin to form a clamping circuit to protect the circuit. The output electrolytic capacitor C5 is connected in parallel with the bypass capacitor C6 to filter out the voltage ripple and achieve output voltage stability. The voltage divider resistors R3 and R7 connected to the VSENSE pin can set the output voltage, and the diode D1 is connected to the voltage output end to achieve circuit protection. In the second way, the voltage divider resistors R9 and R11 connected to the VSENSE pin can set the output voltage, and the diode D8 is connected to the voltage output end to achieve circuit protection.

[0073] In a specific embodiment, a discharge voltage detection circuit, a charging voltage detection circuit and a power supply control circuit are provided for the battery pack 5; when the capacity of the battery pack 5 is lower than 20%, the discharge is stopped; at the same time, the AC input terminal is detected to be working normally to output the rectified voltage, and when the output voltage of the rectifier terminal is detected and the charging capacity of the battery pack 5 is higher than 30%, the battery pack 5 will resume power supply; when the shaft end power generation device 1 has a speed AC voltage, the battery pack 5 is operated to charge and supply power to the data monitoring query terminal and the wind pressure signal terminal; in addition, when one of the data monitoring query terminal and the wind pressure signal terminal has a demand signal, the battery pack 5 can be operated to discharge; if the shaft end power generation device 1 has no speed voltage, the data monitoring query terminal has no communication requirements, and the wind pressure signal terminal has no demand signal, the battery pack 5 stops running. Figure 4 As shown, Figure 4 In (b), resistors R51 and R55 divide the voltage to provide a discharge voltage detection signal; Figure 4 In (c), resistors R54 and R56 divide the voltage to provide a charging voltage detection signal; Figure 4 In (a), the MOS tube Q1, the transistor Q2, the resistor R38 and the resistor R43 form a power supply control circuit resistor; wherein R43 is used to fix the base of the transistor Q2 at a low level when the control is high resistance, so as to prevent it from floating.

[0074] In a specific embodiment, if Figure 5As shown, the speed signal processing module 8 includes a diode D17, resistors R17-R20, R23-R30, capacitors C28-C30, and amplifiers U1-U2; D17 is grounded via R18 and R19 in sequence; the in-phase input terminal of U1 is connected to the common point of R18 and R19 via a resistor R25; one end of R27 and C29 is grounded, and the other end is connected to the in-phase input terminal of U1; the inverting input terminal of U1 is grounded via R20, and connected to the output terminal of U1 via R17; the output terminal of U1 is connected to the inverting input terminal of U2 via R24, and connected to the power supply via R23; the inverting input terminal of U2 is grounded via C28; the in-phase input terminal of U1 is connected to the power supply via R29, and is grounded via R30 and C30 respectively; the output terminal of U1 is connected to resistor R26.

[0075] In specific applications, the positive electrode of diode D17 is connected to the AC input terminal, and the voltage divider setting of resistors R18, R19, R25, and R27 realizes a 100-fold step-down output. The output terminal is used as the positive input terminal of the amplifier circuit. Capacitor C29 and resistor R27 are connected in parallel between pins 3 and 4 to maintain the stability of the positive input voltage. Resistor R20 is connected in series with R17 to increase the reverse voltage gain. Resistor R23 is connected to the filter composed of R24 and C28, and the output of the filter is used as the negative input terminal of pin 6, thereby playing a certain buffering role. Resistor R30 is connected in parallel with capacitor C30 and then in series with resistor R29 to provide a reference voltage, and the speed signal is connected to the MCU controller 6 as a square wave output.

[0076] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.

Claims

1. A power supply circuit for a shaft end power generation device, characterized in that: It comprises a shaft end power generation device (1), an AD / DC conversion module (2), a voltage detection module (3), an output control module (4), a battery pack (5), an MCU controller (6) and a DC / DC conversion module (9); the output end of the shaft end power generation device (1) is connected to the battery pack (5) via the AD / DC conversion module (2); The input end of the output control module (4) is connected to the output end of the battery pack (5), the control end is connected to the MCU controller (6), and the output end is connected to the input end of the DC / DC conversion module (9); The voltage detection module (3) comprises a power generation rectifier voltage detection circuit, a battery pack charging voltage detection circuit and a battery pack discharging voltage detection circuit; one end of the power generation rectifier voltage detection circuit is connected to the rectifier filter output end, and the other end is connected to the MCU controller (6); one end of the battery pack charging voltage detection circuit is connected to the output end of the AD / DC conversion module (2), and the other end is connected to the MCU controller (6); one end of the battery pack discharging voltage detection circuit is connected to the battery pack (5), and the other end is connected to the MCU controller (6).

2. The power supply circuit of the shaft end power generation device according to claim 1, characterized in that: It also includes a speed signal processing module (8), the input end of the speed signal processing module (8) is connected to the output end of the shaft end power generation device (1), and the output end of the speed signal processing module (8) is connected to the MCU controller (6).

3. The power supply circuit of the shaft end power generation device according to claim 2, characterized in that: The speed signal processing module (8) comprises a diode D17, resistors R17-R20, R23-R30, capacitors C28-C30, and amplifiers U1-U2; D17 is grounded via R18 and R19 in sequence; the in-phase input terminal of U1 is connected to the common point of R18 and R19 via resistor R25; one end of R27 and C29 is grounded, and the other end is connected to the in-phase input terminal of U1; the inverting input terminal of U1 is grounded via R20 and connected to the output terminal of U1 via R17; the output terminal of U1 is connected to the inverting input terminal of U2 via R24 and connected to a power supply via R23; the inverting input terminal of U2 is grounded via C28; the in-phase input terminal of U1 is connected to a power supply via R29 and is grounded via R30 and C30 respectively; the output terminal of U1 is connected to resistor R26.

4. The power supply circuit of the shaft end power generation device according to claim 1, 2 or 3, characterized in that: The AD / DC conversion module (2) comprises a rectification and filtering circuit and a voltage stabilizing circuit; the output end of the rectification and filtering circuit is connected to the input end of the voltage stabilizing circuit.

5. The power supply circuit of the shaft end power generation device according to claim 4, characterized in that: The rectification and filtering circuit comprises a plurality of full-wave rectification bridges connected in parallel.

6. The power supply circuit of the shaft end power generation device according to claim 4, characterized in that: The voltage stabilizing circuit includes a voltage stabilizing chip, capacitors C31-C34, C38, diodes D20, D21, D22, D23, resistors R31, R32, R33, R36, R37, R39, R40, R41, R42, and an inductor L1; After C31 and C32 are connected in parallel, one end is connected to the output end of the rectifier filter circuit and the DRV end of the voltage regulator chip, and the other end is grounded; The positive electrode of D20 is connected to one end of C34 and grounded, the negative electrode of D20 is connected to the other end of C34 and connected to one end of R33, and the other end of R33 is connected to the output end of the rectifier filter circuit; The negative electrode of D23 is connected to one end of R33 via R36, and the negative electrode of D23 is connected to the VSN end of the voltage regulator chip via the inductor; One end of C38 is connected to the VCC end of the voltage regulator chip, and the other end of C38 is grounded; The VFB1 terminal of the voltage regulator chip is grounded via a resistor R41, and is connected to the VSN terminal of the voltage regulator chip via R42 and L1 in sequence; The VFB2 end of the voltage regulator chip is grounded via R39 and R40 respectively; The VSS and VSN terminals of the voltage regulator chip are connected and grounded, and are grounded to the VSP terminal of the voltage regulator chip through R31 and R32 respectively; The cathode of D21 and D22 is connected to the VSP terminal of the voltage regulator chip, and the anode is grounded; one end of C33 and R37 is grounded, and the other end is connected to the VSN terminal of the voltage regulator chip.

7. The power supply circuit of the shaft end power generation device according to claim 6, characterized in that: It also includes a diode D19, and the positive electrode of D19 is connected to the VSN terminal of the voltage regulator chip through L1.

8. The power supply circuit of the shaft end power generation device according to claim 1, 2 or 3, characterized in that: The DC / DC conversion module (9) comprises a 24V to 3.3V circuit, a 24V to 12V circuit and a 24V to 15V circuit.

9. The power supply circuit of the shaft end power generation device according to claim 8, characterized in that: The 24V to 3.3V circuit includes a LM2596 chip, capacitors C25-C27 and a diode D18; Capacitor C27 is an energy storage capacitor connected to the voltage output control terminal of the battery pack (5); The negative end of diode D18 is connected to the Output pin of the LM2596 chip, and the positive end is grounded; One end of the inductor L3 is connected to the negative end of the diode D18, and the other end is connected to one end of the capacitors C25 and C26; the other ends of the capacitors C25 and C26 are grounded.

10. The power supply circuit of the shaft end power generation device according to claim 1, 2 or 3, characterized in that: It also includes a communication module (7), wherein the communication module (7) is connected to the MCU controller (6).

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