CN212304741U - Direct current regenerative braking discharge system - Google Patents

Abstract

The utility model discloses a direct current regenerative braking discharge system, which comprises a direct current power supply and a servo driver connected on a direct current bus of the direct current power supply, and also comprises a direct current bus voltage monitoring module, a DSP processor module, a MOSFET driving module and a discharge resistor which are arranged in series; the direct current bus voltage monitoring module monitors the voltage of a direct current bus in real time and outputs the monitored real-time voltage information to the DSP module; the DSP module outputs discharge PWM duty ratio control information according to the real-time voltage information and the preset discharge voltage information; and the MOSFET driving module controls the discharge resistor to be correspondingly switched on and off according to the discharge PWM duty ratio control information so as to discharge energy.

Description

Direct current regenerative braking discharge system

Technical Field

The utility model relates to a system especially relates to a direct current regenerative braking discharge system.

Background

As the demand of robots (including logistics robots, inspection robots, cooperative robots, and the like) is increasing, the direct current servo has an increasing share in the market.

During the use of the robot, the motor can enter a power generation state when the robot brakes and decelerates, so that redundant electric energy is generated. If this power is not absorbed or released by the power supply or by a capacitor connected in parallel to the dc bus, the dc bus voltage will increase, which may damage the drive or other equipment connected to the dc bus.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's drawback provides a direct current regenerative braking discharge system.

The utility model discloses a direct current regenerative braking discharge system, including DC power supply and the servo driver connected to the DC bus of the DC power supply, also including the DC bus voltage monitoring module, DSP processor module, MOSFET drive module and discharge resistance that are set up in series;

the direct current bus voltage monitoring module monitors the voltage of a direct current bus in real time and outputs the monitored real-time voltage information to the DSP module;

the DSP module outputs discharge PWM duty ratio control information according to the real-time voltage information and the preset discharge voltage information;

and the MOSFET driving module controls the discharge resistor to be correspondingly switched on and off according to the discharge PWM duty ratio control information so as to discharge energy.

Direct current regenerative braking discharge system in, still include to DSP processor module input discharge parameter's information input module.

Direct current regenerative braking discharge system in, information input module is the host computer.

Direct current regenerative braking discharge system in, information input module is the button.

Direct current regenerative braking discharge system in, still include with DSP processor module connects and shows real-time voltage information's information output module.

In the dc regenerative braking discharge system, the information output module is a nixie tube.

Direct current regenerative braking discharge system in, still include energy storage electric capacity, energy storage electric capacity's both ends are connected respectively in anodal and the power negative pole of power.

The direct current regenerative braking discharging system of the utility model also comprises a temperature switch which is arranged in the discharging resistance working circuit in series;

when the set temperature is reached, the temperature switch cuts off the working circuit of the discharge resistor.

Direct current regenerative braking discharge system in, through the voltage of real-time supervision direct current generating line to adjust the PWM duty cycle control information that discharges according to this, and then can the discharge intensity of adjustment system and the speed of discharging, be favorable to the stability of assurance system at discharge in-process voltage, also be favorable to guaranteeing the performance safety of motor.

Drawings

Fig. 1 is a schematic structural diagram of the dc regenerative braking discharge system of the present invention.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

As shown in fig. 1, direct current regenerative braking discharge system, including dc power supply (this dc power supply has positive and power negative pole to draw forth direct current generating line respectively from positive and power negative pole) and connect the servo driver on this dc power supply's direct current generating line (but servo driver parallel access is many), still including the direct current generating line voltage monitoring module, DSP processor module, MOSFET drive module and the discharge resistance that establish ties and set up (promptly direct current generating line voltage monitoring module, DSP processing module, MOSFET drive module and discharge resistance are series connection earlier, insert on the direct current generating line again).

The direct current bus voltage monitoring module monitors the voltage of the direct current bus in real time and outputs the monitored real-time voltage information to the DSP module. The DSP module has a data processing function and can process input information and output information processing results.

For example, an information input module is provided, and discharging parameters such as discharging voltage and discharging time are input to the DSP processor module through the information input module, so as to control discharging PWM duty ratio control information output after the DSP processor module performs PID operation on data information. The information input module can be specifically a button or an upper computer communicated through a serial port.

For another example, the information output module is arranged to display the real-time voltage information of the direct current bus output by the DSP processor module. The information output module can be embodied as a nixie tube.

The utility model discloses in, DSP processor module basis real-time voltage information and predetermined discharge voltage information output discharge PWM duty cycle control information. PID operation is carried out through input real-time voltage information and preset discharging voltage information, and discharging PWM duty ratio control information is obtained. The discharge PWM duty ratio control information mentioned here is related to the discharge intensity and the discharge speed, namely, the discharge intensity and the discharge speed are determined by the real-time voltage and the set discharge voltage, so that the discharge intensity and the discharge speed of the system can be adjusted by monitoring the voltage of the direct current bus in real time and adjusting the discharge PWM duty ratio control information according to the real-time voltage information, thereby being beneficial to ensuring the voltage stability of the system in the discharge process and the performance safety of the motor. The discharging PWM duty ratio control information is output to the MOSFET driving module, and the MOSFET driving module controls the discharging resistor to be correspondingly switched on and off according to the discharging PWM duty ratio control information so as to discharge energy in a heating mode.

Direct current regenerative braking discharge system in, still include energy storage electric capacity, energy storage electric capacity's both ends are connected respectively in anodal and the power negative pole of power. When the motor enters a power generation state due to deceleration braking, the kinetic energy is converted into electric energy. If the generated energy of the motor is less at the moment, the generated electric energy can be absorbed through the energy storage capacitor. Until the generated energy generated by the motor is large, the energy storage capacitor is not enough to absorb all the electric quantity, and the voltage on the direct current bus is continuously increased, the energy is discharged in a heating mode through the discharge resistor.

The utility model also comprises a temperature switch which is arranged in the discharge resistance working circuit in series; when the set temperature is reached, the temperature switch cuts off the working circuit of the discharge resistor. That is, under normal conditions, the discharge time is limited, that is, the DSP processor module sets the discharge time so as not to cause the discharge resistor temperature to be too high. However, as the discharging process is carried out, the temperature of the discharging resistor is increased, the temperature switch can be not controlled by the DSP processor module, and when the temperature is higher than the set temperature, the working circuit of the discharging resistor is cut off to protect the discharging resistor.

While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.

Claims (8)

1. A direct current regeneration braking discharge system comprises a direct current power supply and a servo driver connected to a direct current bus of the direct current power supply, and is characterized by further comprising a direct current bus voltage monitoring module, a DSP processor module, a MOSFET driving module and a discharge resistor which are arranged in series;

the direct current bus voltage monitoring module monitors the voltage of a direct current bus in real time and outputs the monitored real-time voltage information to the DSP module;

the DSP module outputs discharge PWM duty ratio control information according to the real-time voltage information and the preset discharge voltage information;

and the MOSFET driving module controls the discharge resistor to be correspondingly switched on and off according to the discharge PWM duty ratio control information so as to discharge energy.

2. The dc regenerative braking discharge system of claim 1, further comprising an information input module that inputs discharge parameters to the DSP processor module.

3. The dc regenerative braking discharge system of claim 2, wherein the information input module is a host computer.

4. The dc regenerative brake discharge system of claim 2, wherein the information input module is a button.

5. The dc regenerative braking discharge system of claim 1, further comprising an information output module coupled to the DSP processor module and displaying real-time voltage information.

6. The dc regenerative braking discharge system of claim 5, wherein the information output module is a nixie tube.

7. The dc regenerative brake discharge system of claim 1, further comprising an energy storage capacitor having two ends connected to the positive power supply electrode and the negative power supply electrode, respectively.

8. The dc regenerative brake discharge system of claim 1, further comprising a temperature switch disposed in series in the discharge resistor operating circuit;

when the set temperature is reached, the temperature switch cuts off the working circuit of the discharge resistor.

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