CN102427262B - Elevator Braking Energy Feedback and Control System Based on Super Capacitor - Google Patents

Abstract

The invention discloses an elevator braking energy feedback and control system based on a supercapacitor, comprising a supercapacitor energy storage module, a bidirectional DC-DC converter, an energy feedback control chip, a first hardware protection module, and a second hardware protection module. The supercapacitor energy storage module, the bidirectional DC-DC converter, and the first hardware protection module are connected in sequence, and the signal conditioning circuits of the bidirectional DC-DC converter are respectively connected to the second hardware protection module. The lead-in machine is connected, and the energy feedback control chip is respectively connected with the supercapacitor energy storage module, the signal conditioning circuit, the second hardware protection module, and the busbar of the frequency converter. The invention effectively protects the supercapacitor module, ensures its constant voltage discharge, and protects the safety of the supercapacitor module.

Description

Elevator Braking Energy Feedback and Control System Based on Super Capacitor

technical field

The invention belongs to the technical field of elevator energy saving, in particular to an elevator braking energy feedback and control system based on a supercapacitor.

Background technique

So far, my country has become the world's third largest producer of elevators after the two major elevator producers of the United States and Japan; at the same time, with the continuous improvement of people's living standards and the popularity of high-rise buildings, my country has also become the world's first elevator user big country. Relevant data show that by the end of 2007, the total number of elevators used in various fields in my country reached more than 1 million, and maintained an annual growth rate of more than 100,000. By the end of 2010, the total number of elevators in my country will reach more than 1.3 million. With the popularity of elevators, various problems in the use of elevators have also received more and more attention.

Normally, the daily power consumption of an ordinary elevator is between 5OKWH-150KWH. During the operation of the elevator, the traction machine that drives the elevator car will consume most of the energy. According to relevant statistical data, the traction machine system The power consumption of electric motor driving accounts for more than 75% of the total energy of elevator operation. For the electric energy generated during the braking process of the elevator, if it is recycled and reused on the spot, it can not only greatly reduce energy waste, but also avoid adding too much additional equipment.

The use of supercapacitors as the characteristics of high-current discharge of supercapacitors can provide peak power for elevator startup, while reducing the system's requirements for the power supply level of the external AC grid, while ensuring the stability and safety of the elevator system; fully utilizing the supercapacitor cycle It has the advantages of long life, high cycle efficiency, and good stability. If it is used as a recovery and storage device for braking energy during elevator operation, the total amount of electric energy saved will be considerable.

Contents of the invention

The purpose of the present invention is to provide an elevator braking energy feedback and control system based on a supercapacitor, which recovers and stores the energy generated during the elevator braking process and provides it to the elevator system, so as to achieve the purpose of energy saving.

The technical solution to realize the object of the present invention is: a supercapacitor-based elevator braking energy feedback and control system, including a supercapacitor energy storage module, a bidirectional DC-DC converter, an energy feedback control chip, a first hardware protection module, The second hardware protection module, the supercapacitor energy storage module, the bidirectional DC-DC converter, and the first hardware protection module are connected in sequence, the signal conditioning circuit of the bidirectional DC-DC converter is respectively connected to the second hardware protection module, and the first hardware protection module The inverter bus is connected to the traction machine, and the energy feedback control chip is connected to the supercapacitor energy storage module, the signal conditioning circuit, the second hardware protection module, and the inverter bus respectively;

The whole system takes the energy feedback control chip as the core, and the energy feedback control chip controls the bidirectional DC-DC converter and the first hardware protection module, so as to enable the safe and effective charging of the supercapacitor module and power supply to the inverter bus. When the feedback control chip fails, the second hardware protection module quickly cuts off the DC-DC converter and reliably protects the supercapacitor energy storage module. That is, when the elevator is in the braking state, if the energy feedback control chip detects the supercapacitor energy storage module If the module does not reach the rated voltage, open the charging circuit of the bidirectional DC-DC converter to charge the supercapacitor energy storage module; when it is detected that the supercapacitor energy storage module is charged to the rated voltage, cut off the charging circuit via the bidirectional DC-DC converter , connect the remaining energy on the inverter bus to the first hardware protection module; when the elevator is running normally, if the energy feedback control chip detects that the supercapacitor energy storage module is at the rated voltage, it will open the discharge circuit of the bidirectional DC-DC converter, and the supercapacitor The electric energy on the capacitor energy storage module is provided to the traction machine in a constant voltage manner.

Compared with the prior art, the present invention has significant advantages: (1) Charge the supercapacitor with a constant current, and add a step-down inductor in the charging circuit at the same time, which can prevent the impact of excessive voltage on the supercapacitor module and effectively protect the supercapacitor Capacitor module; (2) When the supercapacitor supplies power to the outside world, the PID control strategy is adopted to adjust the output voltage of the supercapacitor in real time to ensure its constant voltage discharge; (3) When the supercapacitor has been charged to the rated value, if the inverter If the bus voltage is still higher than the voltage of the supercapacitor, the DC-DC converter will be shut down immediately, and the busbar of the inverter is connected to the energy-dissipating resistor circuit to protect the safety of the supercapacitor module; (4) Introduce an additional hardware protection circuit for real-time monitoring If the voltage and current of the supercapacitor module and the busbar of the inverter exceed the set value, the control signal will be blocked and the control system will be shut down to ensure the safety of the system.

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the structural block diagram of the elevator braking energy feedback system based on the supercapacitor of the present invention;

Fig. 2 is the schematic diagram of the DC-DC converter module circuit of the elevator braking energy feedback system based on the supercapacitor of the present invention;

Fig. 3 is the circuit principle diagram of the first hardware protection module of the elevator braking energy feedback system based on the supercapacitor of the present invention;

Fig. 4 is the circuit principle diagram of the second hardware protection module of the elevator braking energy feedback system based on the supercapacitor of the present invention;

Fig. 5 is the core DSP-2812 pin diagram of the minimum control system of the elevator braking energy feedback system based on the supercapacitor of the present invention;

Fig. 6 is a schematic diagram of the overall circuit of the elevator braking energy feedback system based on the supercapacitor of the present invention.

Detailed ways

Combined with Fig. 1, the elevator braking energy feedback and control system based on supercapacitor of the present invention includes supercapacitor energy storage module 1 (patent applied for, publication number: CN 101807821A), bidirectional DC-DC converter 2, energy feedback control chip 3. The first hardware protection module 4, the second hardware protection module 5, the supercapacitor energy storage module 1, the bidirectional DC-DC converter 2, and the first hardware protection module 4 are connected in sequence, and the bidirectional DC-DC converter 2 is respectively signal-conditioned The circuit is connected to the second hardware protection module 5, the first hardware protection module 4 is connected to the traction machine through the inverter bus, and the energy feedback control chip 3 is connected to the supercapacitor energy storage module 1, the signal conditioning circuit, and the second hardware protection module 5 respectively. , and inverter busbars are connected separately;

The whole system takes the energy feedback control chip 3 as the core, and the energy feedback control chip 3 controls the bidirectional DC-DC converter 2 and the first hardware protection module 4, so that the supercapacitor module 1 can be safely and effectively charged and the inverter Bus power supply, when the energy feedback control chip 3 fails, the second hardware protection module 5 quickly cuts off the DC-DC converter 2, and reliably protects the supercapacitor energy storage module 1, that is, when the elevator is in the braking state, if the energy The feedback control chip 3 detects that the supercapacitor energy storage module 1 has not reached the rated voltage, opens the charging circuit of the bidirectional DC-DC converter 2, and charges the supercapacitor energy storage module 1; when it detects that the supercapacitor energy storage module 1 is charged to the rated voltage voltage, cut off the charging circuit through the bidirectional DC-DC converter 2, connect the remaining energy on the inverter bus to the first hardware protection module 4, and use the energy consumption resistor R2 to release the energy safely; when the elevator is running normally, if the energy feedback The control chip 3 detects that the supercapacitor energy storage module 1 is at the rated voltage, opens the discharge circuit of the bidirectional DC-DC converter 2, and provides the electric energy on the supercapacitor energy storage module 1 to the traction machine at a constant voltage.

Referring to Fig. 2, the above-mentioned bidirectional DC-DC converter 2 includes a first IGBT module S1, a second IGBT module S2, a step-down inductor L, a first diode D1, a second diode D2, a first current Hall sensor I1 and the second current Hall sensor I2, the supercapacitor energy storage module 1 is connected to the step-down inductance L through the first relay, and the step-down inductance L is connected to the first current Hall sensor I1, and the first current Hall sensor The sensor I1 is respectively connected to the emitter of the first IGBT module S1 and the collector of the second IGBT module S2, and the first diode D1 is connected in parallel to the emitter and collector of the first IGBT module S1. The collector of one IGBT module S1 is connected to the second current Hall sensor I2, the second current Hall sensor I2 is connected to the first hardware protection module 4, and the second diode D2 is connected in parallel to the emitter of the second IGBT module S2. The emitter of the second IGBT module S2 is connected to the supercapacitor energy storage module 1;

The first IGBT module S1 and the second IGBT module S2 are respectively connected in parallel with diodes to ensure that when a single IGBT is working, the other is in a protected state, and the PWM signal of the energy feedback control chip 3 is used to control the first IGBT module S1, The second IGBT module S2 changes the on-off degree of the first IGBT module S1 and the second IGBT module S2 by changing the duty cycle of the PWM control signal, so as to ensure that the voltage is stable during discharge and the current is constant during charging; When charging the supercapacitor energy storage module 1 by the converter bus, the first IGBT module S1 acts, the second diode D2 conducts, and the step-down inductor L reduces the impact of charging energy on the supercapacitor energy storage module 1, reducing the charging voltage; The voltage Hall sensor V1 at both ends of the supercapacitor energy storage module 1 and the voltage Hall sensor V2 at the bus terminal of the inverter feed back the two voltage signals during the discharge process to the energy feedback control chip 3, and use the PID control algorithm to ensure the constant voltage Output; similarly, the first current Hall sensor I1 and the second current Hall sensor I2 also feed back the current parameters to the energy feedback control chip 3 to ensure a constant input of current. The PID control formula is as follows:

Δu(k)=Ae(k)-Be(k-1)+Ce(k-2);

.C where A=Kp(1+T/TI+TD/T), B=Kp(1+2TD/T)., C=KpTD/T.

3, the first hardware protection module 4 of the elevator braking energy feedback and control system based on the supercapacitor of the present invention includes a current limiting resistor R1, a solid state relay, a second relay, a discharge tube S3, a power consumption resistor R2, and a bidirectional DC -The second current Hall sensor I2 in the DC converter 2 is connected to the second relay, the current limiting resistor R1 is connected in parallel to both ends of the second relay, the solid state relay is connected to the second relay, and the solid state relay is connected to the discharge tube S3 Collector, the collector of the discharge tube S3 is connected to the bus bar of the frequency converter, the emitter of the discharge tube S3 is connected to one end of the energy consumption resistor R2, and the other end of the energy consumption resistor R2 is grounded;

The moment the inverter busbar charges the supercapacitor energy storage module 1, there will be a large current impact on the bidirectional DC-DC converter 2, so it is necessary to start the current limiting resistor R1, and the second relay controls the starting current limiting resistor R1, from the frequency conversion The inverter bus starts to charge the supercapacitor energy storage module 1 until the set time, the second relay is always disconnected, and the current limiting resistor R1 is activated to ensure the safe operation of the bidirectional DC-DC converter 2; the relay control module on the inverter bus side , using solid-state relays to prevent the arc effect caused by ordinary relays at higher voltages. When the supercapacitor energy storage module 1 is charged to the rated voltage, the elevator is still in the braking state, and the bus terminal of the inverter still has a high voltage, the energy feedback control chip 3 turns on the discharge tube S3, starts the energy consumption resistor R2, and releases the inverter safely. The residual energy at the bus terminal of the transformer.

In conjunction with Fig. 4, the second hardware protection module 5 of the elevator braking energy feedback and control system based on the supercapacitor of the present invention includes a comparator connected in sequence, an optocoupler TLP521, a logic judge 74HC20, and the voltage at both ends of the supercapacitor energy storage module 1 The measured values of the Hall sensor V1, the voltage Hall sensor V2 at the bus terminal of the frequency converter, the first current Hall sensor I1 and the second current Hall sensor I2 are sent to the comparator through the signal conditioning circuit. The set value of the comparator by those skilled in the art can be determined according to the rated voltage and rated current of the system), the second hardware protection module 5 does not act, if it is higher than the set value, the second hardware protection module 5 is started. The second hardware protection module 5, as an emergency protection module, will not be triggered during normal working conditions, and will only work when the voltage or current regulation of the feedback system fails, and the charging and discharging circuit has overvoltage or overcurrent. The output signal of the second hardware protection module 5 is connected to the nPDPINT power interruption protection pin of the DSP control core and the signal blocking control pin of the PWM control signal buffer stage 74HC245. When the voltage or current in the system exceeds the set value, the protection module starts immediately, blocks the PWM signal, and cuts off the connection between the bidirectional DC-DC converter 2 and the supercapacitor energy storage module 1 and the busbar of the inverter to prevent the system from overheating. overvoltage or overcurrent damage.

In conjunction with Fig. 5, the energy feedback control chip 3 of the elevator braking energy feedback and control system based on the supercapacitor of the present invention adopts DSP-2812, and its pin ADCB0 is connected to the signal conditioning circuit to detect the voltage at both ends of the supercapacitor energy storage module 1. Hall sensor V1, pin ADCB1 is connected to the signal conditioning circuit to detect the first current Hall sensor I1 flowing through the supercapacitor energy storage module 1, and pin ADCB2 is connected to the signal conditioning circuit to detect the voltage Hall sensor at both ends of the inverter bus V2, the pin ADCB3 is connected to the signal conditioning circuit to detect the second current Hall sensor I2 flowing through the inverter bus, and the pin PWM1 is connected to the first bidirectional DC-DC converter 2 through the buffer stage 74HC425 and optocoupler HCPL3120 The first IGBT module S1 is used for the on-off control of the first IGBT module S1 during the charging process; the pin PWM2 is connected to the second IGBT module S2 in the bidirectional DC-DC converter 2 through the buffer stage 74HC425 and the optocoupler HCPL3120. During the discharge process, the on-off control of the second IGBT module S2; the pin GPIOA13 is connected to the first relay of the super capacitor and the DC-DC converter 2 through the optocoupler control, and the pin GPIOA14 is connected to the first relay of the current limiting resistor R1 through the optocoupler. Two relays; the pin GPIOA15 is controlled by the optocoupler to connect the inverter bus and the solid state relay of the DC-DC converter 2; the pin GPIO15B13 is controlled by the optocoupler to control the discharge tube S3 in the first hardware protection module 4 to control the first hardware protection On and off of module 4.

Fig. 6 is a schematic diagram of the overall circuit of the elevator braking energy feedback system based on the supercapacitor of the present invention, detailing the complete implementation process of the present invention.

Charging: When the elevator is in the braking state, the voltage at the two ends is measured by the voltage Hall sensor V1 at both ends of the supercapacitor energy storage module 1 and the voltage Hall sensor V2 at both ends of the inverter bus. If the supercapacitor energy storage module 1 terminal When the voltage is lower than the rated value, the energy feedback control chip 3 sends a control signal through the pins GPIOA13 and GPIOA15 to make the first relay and the solid state relay close, and the supercapacitor energy storage module 1 and the inverter bus are connected through the DC-DC converter 2 To form a complete loop, initially the energy feedback control chip 3 controls the second relay to be disconnected, and the current limiting resistor R1 is activated to ensure that the DC-DC converter 2 is not impacted by a large current. Change the duty cycle of the PWM1 control signal through the energy feedback control chip 3 to adjust the conduction degree of the first IGBT module S1 in the DC-DC converter 2, and pass the current on the path of the bidirectional DC-DC converter 2 through the first The current Hall sensor I1 and the second current Hall sensor I2 detect,

Real-time feedback to the energy feedback control chip 3, PID control of the current, to ensure constant current charging of the super capacitor; if the voltage Hall sensor V1 at both ends of the super capacitor energy storage module 1 detects that the voltage at the terminal 1 of the super capacitor energy storage Its rated value, in order to protect the supercapacitor energy storage module 1, the energy feedback control chip 3 sends a control signal through the pins GPIOA13 and GPIOA15, so that the first relay and the solid state relay are disconnected, and the supercapacitor energy storage module 1, the inverter bus and the DC - The DC converter 2 is completely disconnected safely, the inverter bus is connected to the first hardware protection module 4, the energy feedback control chip 3 sends a control signal through the pin GPIO15B13, and the discharge tube S3 in the first hardware protection module 4 is turned on, and the The remaining energy on the inverter bus is safely released by the energy consumption resistor R2 to protect the safety of the entire energy feedback system.

Discharge: When the elevator is in normal operation or in other emergency situations, the energy stored in the supercapacitor energy storage module 1 is fed back to the motor drive system of the elevator; the voltage fed back by the supercapacitor energy storage module 1 must be kept consistent with the voltage at the bus terminal of the inverter In order to ensure the stable operation of the elevator motor, the energy feedback of the supercapacitor energy storage module 1 adopts constant voltage discharge. The supercapacitor energy storage module 1 and the inverter bus are connected to form a complete circuit through the DC-DC converter 2, and the voltage Hall sensor V2 at both ends of the inverter busbar and the voltage Hall sensor V1 at both ends of the supercapacitor energy storage module 1 are connected. The detected voltage is fed back to the energy feedback control chip 3, and the PID control algorithm is used to adjust the conduction degree of the second IGBT module S2 in the bidirectional DC-DC converter 2 by changing the duty ratio of the PWM2 control signal to ensure super The voltage of the capacitor connected to the bus terminal of the inverter is always kept stable.

While considering the first hardware protection module 4 above, the present invention specially introduces a second hardware protection module 5 in order to protect the whole system more effectively. This module obtains the voltage at both ends of the supercapacitor energy storage module 1 and the current flowing through the supercapacitor loop and the voltage and current at the bus terminal of the frequency converter in real time, and compares them with the set values. The output signal of the second hardware protection module 5 is connected to the nPDPINT power interruption protection pin of the energy feedback control chip 3 and the signal blocking control pin of the PWM control signal buffer stage 74HC245. When the voltage or current in the system exceeds the set value, the protection module starts immediately, blocks the PWM signal, and cuts off the connection between the bidirectional DC-DC converter 2 and the supercapacitor energy storage module 1 and the busbar of the inverter to prevent the system from overheating. overvoltage or overcurrent damage.

Claims (4)

1. elevator braking energy feedback and the control system based on super capacitor, it is characterized in that comprising super capacitor energy-storage module (1), bidirectional DC-DC converter (2), energy feedback control chip (3), the first hardware protection module (4), the second hardware protection module (5), super capacitor energy-storage module (1), bidirectional DC-DC converter (2), the first hardware protection module (4) connects successively, bidirectional DC-DC converter (2) is connected with the second hardware protection module (5) with signal conditioning circuit respectively, the first hardware protection module (4) is connected with traction machine by the frequency converter bus, energy feedback control chip (3) respectively with super capacitor energy-storage module (1), signal conditioning circuit, the second hardware protection module (5), the frequency converter bus connects respectively, described bidirectional DC-DC converter (2) comprises first via IGBT module S1, the second road IGBT module S2, buck inductor L, the first diode D1, the second diode D2, the first current Hall transducer I1 and the second current Hall transducer I2, super capacitor energy-storage module (1) is connected with buck inductor L by the first relay, this buck inductor L is connected with the first current Hall transducer I1, this the first current Hall transducer I1 respectively with the emitter-base bandgap grading of first via IGBT module S1, the collector electrode of the S2 of the second road IGBT module connects, the first diode D1 is connected in parallel on the emitter-base bandgap grading and collector electrode of first via IGBT module S1, the collector electrode of this first via IGBT module S1 is connected with the second current Hall transducer I2, the second current Hall transducer I2 is connected with the first hardware protection module (4), the second diode D2 is connected in parallel on the emitter-base bandgap grading and collector electrode of the second road IGBT module S2, the emitter-base bandgap grading of the second road IGBT module S2 is connected to super capacitor energy-storage module (1),

First via IGBT module S1, the second road IGBT module S2 adopt respectively diode in parallel with it, while guaranteeing single IGBT work, another is in protected state, control first via IGBT module S1, the second road IGBT module S2 by the pwm signal of energy feedback control chip (3), recently change the break-make degree of first via IGBT module S1, the second road IGBT module S2 by the duty that changes pwm control signal, voltage stabilization during with the assurance electric discharge, current constant during charging; When the frequency converter bus charges to super capacitor energy-storage module (1), first via IGBT module S1 effect, the second diode D2 conducting, buck inductor L reduces the impact of rechargeable electrical energy to super capacitor energy-storage module (1), reduces charging voltage; The voltage hall sensor V1 at super capacitor energy-storage module (1) two ends and the voltage hall sensor V2 of frequency converter bus end feed back to energy feedback control chip (3) by two place's voltage signals in discharge process, adopt pid control algorithm, to guarantee the constant output of voltage; Same the first current Hall transducer I1 and the second current Hall transducer I2 also feed back to current parameters energy feedback control chip (3), guarantee the constant input of electric current;

It is core that whole system be take energy feedback control chip (3), control bidirectional DC-DC converter (2) by this energy feedback control chip (3), the first hardware protection module (4), so that the charging safely and effectively of super capacitor energy-storage module (1) reaches the frequency converter bussed supply, in the situation that energy feedback control chip (3) breaks down, the second hardware protection module (5) is cut off bidirectional DC-DC converter (2) rapidly, protect reliably super capacitor energy-storage module (1), work as elevator in on-position, if detecting super capacitor energy-storage module (1), energy feedback control chip (3) do not reach rated voltage, open bidirectional DC-DC converter (2) charge circuit, super capacitor energy-storage module (1) is charged, when super capacitor energy-storage module (1) being detected while charging to rated voltage, cut off the charge circuit via bidirectional DC-DC converter (2), dump energy on the frequency converter bus is accessed to the first hardware protection module (4), when elevator normally moves, if energy feedback control chip (3) detects super capacitor energy-storage module (1) in rated voltage, open bidirectional DC-DC converter (2) discharge loop, the electric energy on super capacitor energy-storage module (1) is offered to traction machine in the constant voltage mode.

2. elevator braking energy feedback and the control system based on super capacitor according to claim 1, it is characterized in that the first hardware protection module (4) comprises current-limiting resistance R1, solid-state relay, the second relay, bleeder pipe S3, energy consumption resistance R2, the second current Hall transducer I2 in bidirectional DC-DC converter (2) is connected to the second relay, current-limiting resistance R1 is connected in parallel on the second relay two ends, solid-state relay is connected with the second relay, this solid-state relay is connected to the collector electrode of bleeder pipe S3, the collector electrode of this bleeder pipe S3 also is connected with the frequency converter bus, the emitter-base bandgap grading of this bleeder pipe S3 is connected to the end of energy consumption resistance R2, the other end ground connection of this energy consumption resistance R2,

The second Control starts current-limiting resistance R1, and from the frequency converter bus, to super capacitor energy-storage module (1), charging starts to setting-up time, and the second relay disconnects all the time, and current-limiting resistance R1 starts, and guarantees the safe operation of bidirectional DC-DC converter (2); When super capacitor energy-storage module (1) charges to rated voltage, elevator is still in on-position, and when frequency converter bus end still has high voltage, energy feedback control chip (3) is opened bleeder pipe S3, start energy consumption resistance R2, the dump energy of safe release frequency converter bus end.

3. elevator braking energy feedback and the control system based on super capacitor according to claim 1, it is characterized in that the second hardware protection module (5) comprises the comparator connected successively, optocoupler TLP521, logic determining device 74HC20, the voltage hall sensor V1 at super capacitor energy-storage module (1) two ends, the voltage hall sensor V2 of frequency converter bus end, the measured value of the first current Hall transducer I1 and the second current Hall transducer I2 is delivered to comparator through signal conditioning circuit, if lower than set point, the second hardware protection module (5) is failure to actuate, if higher than set point, start the second hardware protection module (5), the output signal of the second hardware protection module (5) is received the nPDPINT interruption in power protection pin of energy feedback control chip (3) and the signal of pwm control signal buffer stage 74HC245 blocks the control pin, when the voltage in system or electric current surpass set point, protection module starts immediately, block pwm signal, cut off being connected between bidirectional DC-DC converter (2) and super capacitor energy-storage module (1) and frequency converter bus, in case system is because of overvoltage or overcurrent damage.

4. elevator braking energy feedback and the control system based on super capacitor according to claim 1, it is characterized in that energy feedback control chip (3) adopts DSP-2812, its pin ADCB0 connects signal conditioning circuit, detect the voltage hall sensor V1 at super capacitor energy-storage module (1) two ends, pin ADCB1 connects signal conditioning circuit, detect the first current Hall transducer I1 of the super capacitor energy-storage module (1) of flowing through, pin ADCB2 connects signal conditioning circuit, detect the voltage hall sensor V2 at frequency converter bus two ends, pin ADCB3 connects signal conditioning circuit, detect the second current Hall transducer I2 of the frequency converter bus of flowing through, pin PWM1 is through buffer stage 74HC245, first via IGBT module S1 in optocoupler HCPL3120 access bidirectional DC-DC converter (2), break-make for charging process first via IGBT module S1 is controlled, pin PWM2, through the second road IGBT module S2 in buffer stage 74HC245, optocoupler HCPL3120 access bidirectional DC-DC converter (2), controls for the break-make of discharge process the second road IGBT module S2, pin GPIOA13 is through the first relay of optocoupler control connection super capacitor and DC-DC converter (2), and pin GPIOA14 connects the second relay that starts current-limiting resistance R1 through optocoupler, pin GPIOA15 is through the solid-state relay of optocoupler control connection frequency converter bus and DC-DC converter (2), pin GPIO15B13 controls the bleeder pipe S3 in the first hardware protection module (4) through optocoupler, controls the break-make of the first hardware protection module (4).

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