阅读说明：本技术 一种调压调速系统主控板 (Main control board of voltage and speed regulating system ) 是由 王展英 潘丽 马有亮 许成 沈月红 吴忠辉 胡伟 于 2019-09-11 设计创作，主要内容包括：本发明公开了一种调压调速系统主控板,包括速度给定电路、电路调整斜波发生器、速度调节器、速度反馈调整电路、电流反馈电路、控制制动器和转子电阻切换电路和电流调节器,所述速度给定电路采集外部电位计的模拟电压作为速度给定信号,并输出给电路调整斜波发生器,同时还输出使能信号,电路调整斜波发生器的输出端连接速度调节器。本发明针调压调速系统主控板应用在行车的调压调速系统中,根据外部指令,输出速度信号给脉冲触发板,控制电机运行速度。内部有故障检测、速度斜坡时间设置、实现速度闭环控制和电流闭环控制。(The invention discloses a master control board of a voltage and speed regulating system, which comprises a speed setting circuit, a circuit regulating ramp generator, a speed regulator, a speed feedback regulating circuit, a current feedback circuit, a control brake, a rotor resistance switching circuit and a current regulator, wherein the speed setting circuit collects the analog voltage of an external potentiometer as a speed setting signal and outputs the speed setting signal to the circuit regulating ramp generator, and simultaneously outputs an enabling signal, and the output end of the circuit regulating ramp generator is connected with the speed regulator. The main control board of the voltage and speed regulating system is applied to the voltage and speed regulating system of a traveling crane, and outputs a speed signal to the pulse trigger board according to an external instruction so as to control the running speed of a motor. Internal fault detection, speed ramp time setting, speed closed-loop control and current closed-loop control.)

1. A master control board of a voltage and speed regulating system comprises a speed setting circuit, a circuit regulating oblique wave generator, a speed regulator, a speed feedback regulating circuit, a current feedback circuit, a control brake, a rotor resistance switching circuit and a current regulator, and is characterized in that the speed setting circuit collects the analog voltage of an external potentiometer as a speed setting signal and outputs the speed setting signal to the circuit regulating oblique wave generator and also outputs an enabling signal, the output end of the circuit regulating oblique wave generator is connected with the speed regulator, the speed regulator is also respectively connected with the speed feedback regulating circuit, the current regulator and a direction taking circuit, the direction taking circuit outputs a direction signal, the speed feedback regulating circuit is also connected with the control brake and the rotor resistance switching circuit, the current feedback circuit receives the current feedback signal and outputs the current feedback signal to the current regulator, and the control brake and the rotor resistance switching circuit are connected with an external contactor, the current regulator also outputs a speed signal, the speed feedback is an actual rotating speed signal of the motor, the speed regulator is compared with a given signal, a regulating direction signal is output to the pulse trigger board, meanwhile, the output signal of the speed regulator is compared with the current feedback signal through current regulation, a signal for modulating the conduction angle of the silicon controlled rectifier of the pulse trigger board is output, the actual speed is an absolute value, and the action of the rotor resistance switching contactor is controlled according to the speed.

2. The master control board of the voltage and speed regulating system of claim 1, wherein the speed setting comprises terminals X1-29, the potentiometer voltage is input through the terminals X1-29, is regulated through an operational amplifier, and outputs a signal to control the relay, and when an external X1-71 release signal turns on the coil of the relay to be electrified, the given voltage is turned on through the normally open contact of the relay.

3. The main control board of claim 2, wherein the speed regulator compares the given voltage with the feedback voltage, and outputs the regulation signal through a PI speed regulator composed of an operational amplifier.

4. The main control board of the voltage and speed regulating system according to claim 1, wherein the speed feedback regulating circuit uses a dial switch to regulate the amplitude of the feedback voltage.

5. The main control board of claim 4, wherein the signal output by the speed regulator needs to pass through an absolute value circuit, and according to the conversion of the signal of the speed regulator, the negative value is subjected to inverse equal proportion operation to generate a positive voltage signal.

6. The main control board of a voltage and speed regulating system as claimed in claim 5, wherein the current feedback signal is from a current transformer, rectified by a diode and sampled by a sampling resistor, the positive end of the rectified current feedback is connected to the reverse input end of the operational amplifier, the output of the operational amplifier is the negative value of the current feedback, the signal is superposed with the regulated positive value signal output by the speed regulator, and the regulated value is output to the pulse trigger board by the current regulator.

7. The main control board of a voltage and speed regulating system according to any one of claims 1 to 6, wherein the range of the speed given signal is 0 to ± 10V.

Technical Field

The invention relates to a main control board, in particular to a main control board of a voltage and speed regulating system.

Background

The voltage regulation and speed regulation means that the terminal voltage of the motor is regulated to realize stepless speed regulation of the motor in a certain rotating speed range. The advantage is that the motor operates steadily in the whole speed regulating range. The speed regulation range is also the largest, and the starting voltage of the motor can be regulated to the rated voltage; the PWM speed regulation has the advantages of high efficiency and continuous speed regulation range, and has the disadvantages of pulsation, increased noise and more serious load when the motor runs at the lowest rotating speed.

The invention upgrades and reforms the HE pressure and speed regulating system of the Siemens which operates at present, and is more suitable for the field environment. The circuit board of the existing operating voltage-regulating and speed-regulating system is old, the failure rate is high, the spare parts are difficult to purchase and maintain, the replacement exists in use, the detection is inconvenient, and the circuit board is easy to damage in the transportation process.

Disclosure of Invention

The invention aims to provide a main control board of a voltage and speed regulating system, which aims to solve the problems in the background technology.

In order to realize the purpose, the invention provides the following technical scheme:

a master control board of a voltage and speed regulating system comprises a speed giving circuit, a circuit regulating oblique wave generator, a speed regulator, a speed feedback regulating circuit, a current feedback circuit, a control brake, a rotor resistance switching circuit and a current regulator, wherein the speed giving circuit collects the analog voltage of an external potentiometer as a speed giving signal and outputs the speed giving signal to the circuit regulating oblique wave generator and also outputs an enabling signal, the output end of the circuit regulating oblique wave generator is connected with the speed regulator, the speed regulator is also respectively connected with the speed feedback regulating circuit, the current regulator and a direction taking circuit, the direction taking circuit outputs a direction signal, the speed feedback regulating circuit is also connected with the control brake and the rotor resistance switching circuit, the current feedback circuit receives a current feedback signal and outputs the current feedback signal to the current regulator, and the control brake and the rotor resistance switching circuit are connected with an external contactor, the current regulator also outputs a speed signal, the speed feedback is an actual rotating speed signal of the motor, the speed regulator is compared with a given signal, a regulating direction signal is output to the pulse trigger board, meanwhile, the output signal of the speed regulator is compared with the current feedback signal through current regulation, a signal for modulating the conduction angle of the silicon controlled rectifier of the pulse trigger board is output, the actual speed is an absolute value, and the action of the rotor resistance switching contactor is controlled according to the speed.

As a still further scheme of the invention: the speed setting comprises terminals X1-29, potentiometer voltage is input through the terminals X1-29, the regulation is carried out through an operational amplifier, a signal is output to control a relay, and when an external X1-71 release signal turns on a coil of the relay to be electrified, the given voltage is turned on through a normally open contact of the relay.

As a still further scheme of the invention: the speed regulator compares the given voltage with the feedback voltage, and outputs a regulating signal through a PI speed regulator consisting of an operational amplifier.

As a still further scheme of the invention: the speed feedback adjusting circuit adopts a dial switch to adjust the amplitude of the feedback voltage.

As a still further scheme of the invention: the signal output by the speed regulator needs to pass through an absolute value circuit, and is converted according to the signal of the speed regulator, and negative values are subjected to inverse equal proportion operation to generate a positive voltage signal.

As a still further scheme of the invention: the current feedback signal comes from a current transformer and is obtained by sampling through a sampling resistor after being rectified by a diode, the positive end of the rectified current feedback is connected with the reverse input end of an operational amplifier, the output of the operational amplifier is a negative value of current feedback, the signal is superposed with an adjusted positive value signal output by a speed regulator, and the current regulator outputs an adjusted value to a pulse trigger board.

As a still further scheme of the invention: the range of the speed given signal is 0 to + -10V.

Compared with the prior art, the invention has the beneficial effects that: the main control board of the voltage and speed regulating system is applied to the voltage and speed regulating system of a traveling crane, and outputs a speed signal to the pulse trigger board according to an external instruction so as to control the running speed of a motor. Internal fault detection, speed ramp time setting, speed closed-loop control and current closed-loop control.

Drawings

FIG. 1 is a system architecture diagram of the present invention;

FIG. 2 is a speed setting circuit diagram;

FIG. 3 is a circuit diagram of the regulation for a given speed;

FIG. 4 is a circuit diagram of a speed set ramp generator;

FIG. 5 is a speed feedback circuit diagram;

FIG. 6 is a circuit diagram of direction indication of actual speed;

FIG. 7 is a torque fault circuit diagram;

FIG. 8 is a fault indication and reset circuit diagram;

FIG. 9 is a fail-over circuit diagram;

FIG. 10 is a speed regulator circuit diagram;

FIG. 11 is a circuit diagram of the output direction signal of the speed regulator;

FIG. 12 is a circuit diagram of the absolute value of the speed regulator output;

FIG. 13 is a current feedback circuit diagram;

FIG. 14 is a current regulator circuit diagram;

FIG. 15 is a cut-away resistor circuit diagram;

FIG. 16 is a circuit diagram of taking the absolute value of actual speed;

FIG. 17 is a speed control circuit diagram of the brake;

FIG. 18 is a circuit diagram of switching two segment resistance speed;

FIG. 19 is a circuit diagram of a cut-to-three resistor speed control circuit;

FIG. 20 is a circuit diagram of a speed control circuit for a four segment resistor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.