CN203434898U

CN203434898U - Intelligent brake unit

Info

Publication number: CN203434898U
Application number: CN201320392022.8U
Authority: CN
Inventors: 蔡力立; 高杰; 徐向晖
Original assignee: TIANJIN RED SUN ELECTRIC AUTOMATION CO Ltd
Current assignee: TIANJIN RED SUN ELECTRIC AUTOMATION CO Ltd
Priority date: 2013-07-03
Filing date: 2013-07-03
Publication date: 2014-02-12
Anticipated expiration: 2023-07-03

Abstract

The utility model discloses an intelligent brake unit. The intelligent brake unit comprises a brake resistor, an IGBT switch circuit, a power supply unit and a control unit which is used for controlling the work of the IGBT switch circuit. The signal output port of the control unit is electrically connected with the IGBT switch circuit through an IGBT drive unit. The IGBT switch circuit is provided with a temperature detection unit. The temperature detection unit is electrically connected with the signal input port of the control unit. According to the utility model, a microcontroller is used to produce a PWM wave to control the turn-on and the turn-off of the IGBT switch circuit; according to the detected bus voltage, the duty ratio of the PWM wave is controlled and the magnitude of energy consumption current is controlled; by detecting the magnitude of the energy consumption current and the bus voltage, the microcontroller determines whether the rated power of the device is exceeded; the device uses an intelligent control process, carries out circuit detection through hardware, and is combined with the intelligent control of the microcontroller, thus voltage, current, temperature and the like are monitored in real time; and a user can quickly understand the on-site use situation, so as to well solve a problem.

Description

A kind of intelligent brake unit

Technical field

The utility model relates to technical field of electronic equipment, particularly relates to a kind of intelligent brake unit.

Background technology

As everyone knows, brake unit, full name is " frequency converter tailored version dynamic braking unit ", or " frequency converter tailored version energy feedback unit ", be mainly used in controlling mechanical duty ratio heavier, retro-speed requires very fast occasion, utilize the regenerative electric energy that brake resistance produces motor to consume by brake resistance, or regenerative current is fed back to electric current, at present, traditional brake unit is DC bus signal and a fixed voltage value that comes comparison to gather with voltage comparator, exports the break-make that a signal is controlled IGBT.By long-term practice, find, because the dependence hardware that this traditional mode is single is controlled, so brake voltage is non-adjustable.Overcurrent protection in circuit is simultaneously to rely on fuse, once overcurrent, fuse is burnt.Brake unit is irrecoverable, can only change components and parts.IGBT(Insulated Gate Bipolar Transistor insulated gate bipolar transistor) the energy consumption electric current flowing through in is also non-adjustable, is that single dependence IGBT opens or closes for a long time.

Utility model content

The technical problems to be solved in the utility model is: the intelligent brake unit that a kind of intelligent degree is high, security performance is strong is provided.

The technical scheme that the utility model is taked for the technical problem existing in solution known technology is:

A brake unit, comprising: brake resistance, for controlling IGBT switching circuit and the power subsystem of described brake resistance work; Also comprise: for controlling the control unit of described IGBT switching circuit work; The signal output port of described control unit is electrically connected to by IGBT driver element and IGBT switching circuit, on described IGBT switching circuit, is provided with temperature detecting unit, and described temperature detecting unit is electrically connected to the signal input port of described control unit.

As preferred version, the utility model has also adopted following technical scheme:

Also comprise the braking lockout circuit, fault recognition circuit and the reset circuit that are electrically connected to described control unit.

Described control unit is that model is the single-chip microcomputer of MSP430F1232.

Described IGBT switching circuit comprises IGBT pipe T1～T8, and the grid of described IGBT pipe T1～T8 is electrically connected to described IGBT driver element by resistance R 21～R28.

Described IGBT driver element comprises two identical electronic circuits, and one of them electronic circuit comprises NPN transistor T13 and PNP transistor T11, and the collector electrode of described NPN transistor T13 is connected with 15V power supply electricity by resistance R 27; Between the base stage of NPN transistor T13 and emitter, be connected to resistance R 39, the collector electrode of NPN transistor T13 is by capacitor C 11 ground connection.

Described temperature detecting unit comprises temperature sensor and pulse transformer TRANS1, and wherein: temperature sensor is connected with the secondary coil of pulse transformer TRANS1, the primary coil of pulse transformer TRANS1 is electrically connected to the signal input terminal of single-chip microcomputer.

Advantage and the good effect that the utlity model has are:

The utility model utilizes single-chip microcomputer to produce PWM ripple and controls the conducting of IGBT switching circuit and shutoff, controls the duty ratio of PWM ripple according to detected busbar voltage, controls the size of energy consumption electric current.By detecting energy consumption electric current, with the size of busbar voltage, single-chip microcomputer determines whether to exceed the rated power of this device, if exceeded, fault alarm, asks staff to confirm fault.Change the brake unit of more powerful brake unit or a plurality of same configurations in parallel.This device adopts the intelligent process of controlling, and has overcome conventional hardware control circuit and has controlled inconvenient drawback.By hardware detecting circuit, the Based Intelligent Control in conjunction with single-chip microcomputer, has realized voltage, electric current, and the real-time monitoring of temperature etc., makes user can understand faster on-the-spot behaviour in service, thereby better deals with problems.

Accompanying drawing explanation

Fig. 1 is the structured flowchart of the utility model the first specific embodiment;

Fig. 2 is the structured flowchart of the utility model the second specific embodiment;

Fig. 3 is partial circuit diagram of the present utility model, is mainly used in the circuit structure of indicative control unit;

Fig. 4 is partial circuit diagram of the present utility model, is mainly used in showing the circuit structure of IGBT switching circuit;

Fig. 5 is partial circuit diagram of the present utility model, is mainly used in showing the circuit structure of IGBT driver element;

Fig. 6 is partial circuit diagram of the present utility model, is mainly used in the circuit structure of displays temperature detecting unit;

Fig. 7 is partial circuit diagram of the present utility model, is mainly used in the circuit structure of display power supply unit;

Fig. 8 is partial circuit diagram of the present utility model, is mainly used in showing the circuit structure of braking lockout circuit and fault recognition circuit;

Fig. 9 is partial circuit diagram of the present utility model, is mainly used in showing the circuit structure of fault message output circuit.

Wherein: 1, temperature detecting unit; 2, control unit; 3, IGBT driver element; 4, IGBT switching circuit; 5, brake resistance; 6, braking lockout circuit; 7, fault recognition circuit; 8, reset circuit.

Embodiment

For further understanding utility model content of the present utility model, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:

Refer to Fig. 1, a kind of intelligent brake unit, comprising: temperature detecting unit 1, control unit 2, IGBT driver element 3, IGBT switching circuit 4, brake resistance 5 and power subsystem; Wherein: IGBT switching circuit 4 is for controlling the operating state of brake resistance 5, control unit 2 is for controlling the operating state of IGBT switching circuit, the signal output port of control unit 2 is electrically connected to by IGBT driver element 3 and IGBT switching circuit 4, temperature detecting unit 1 is arranged on IGBT switching circuit 4, and temperature detecting unit 1 is electrically connected to the signal input port of control unit 2.In this specific embodiment, the single-chip microcomputer that the preferred model of control unit 2 is MSP430F1232;

The operation principle of this specific embodiment is: intelligent brake unit is connected on frequency converter, inverter and common DC bus by DC bus connecting terminals, utilize single-chip microcomputer to produce PWM ripple and control IGBT conducting and shutoff, according to detected busbar voltage, control the duty ratio of PWM ripple, control the size of energy consumption electric current.By detecting energy consumption electric current, size with busbar voltage, single-chip microcomputer determines whether to exceed the rated power of this device, when DC bus-bar voltage reaches a limit value, the signal that intelligent brake unit utilizes testing circuit to detect, by single-chip microcomputer internal processes, control the switch of IGBT switching circuit 4, and detect the temperature of IGBT switching circuit 4, the signals such as electric current in brake resistance 5 simultaneously, with the good operation of assurance device.

Refer to Fig. 2, a kind of intelligent brake unit, on the basis of specific embodiment 1, also comprises the braking lockout circuit 6, fault recognition circuit 7 and the reset circuit 8 that are electrically connected to control unit 2.

Refer to Fig. 3, in above-mentioned specific embodiment, the single-chip microcomputer that control unit 2 models are MSP430F1232, what reset circuit 8 was selected is that model is the watchdog chip of TPS3823-33.

Refer to Fig. 4, in above-mentioned specific embodiment, IGBT switching circuit 4 comprises IGBT pipe T1～T8, and the grid of described IGBT pipe T1～T8 is electrically connected to IGBT driver element 3 by resistance R 21～R28.So just reach multitube and distribute the energy consumption electric current flowing through in brake resistance 5 simultaneously, reach the effect of power-sharing, if wherein have one by all means because certain reason breaks down, other pipes equally work, and can not produce too much influence.

Refer to Fig. 5, in above-mentioned specific embodiment, IGBT driver element 3 comprises two identical electronic circuits, and one of them electronic circuit comprises NPN transistor T13 and PNP transistor T11, and the emitter of NPN transistor T13 and PNP transistor T11 is electrically connected to; The collector electrode of described NPN transistor T13 is connected with 15V power supply electricity by resistance R 27; Between the base stage of NPN transistor T13 and emitter, be connected to resistance R 39, the collector electrode of NPN transistor T13 is by capacitor C 11 ground connection; IGBT driver element 3 is electrically connected to IGBT switching circuit 4 by resistance R 37, resistance R 38.

Refer to Fig. 6, in above-mentioned specific embodiment, temperature detecting unit 1 comprises temperature sensor and pulse transformer TRANS1, and wherein: temperature sensor is connected with the secondary coil of pulse transformer TRANS1, the primary coil of pulse transformer TRANS1 is electrically connected to the signal input terminal of single-chip microcomputer; When excess Temperature, the resistance of temperature sensor can sharply decline, and then single-chip microcomputer acknowledge(ment) signal, carries out the shutoff of IGBT.

Refer to Fig. 7, in above-mentioned specific embodiment, power subsystem includes: the chip U4 that DC24V is converted to 5V, and the chip U8 that 5V is converted to VCC, capacitor C 21～C30, voltage-stabiliser tube D20, resistance R 40～R42, Vcc is 3.3V voltage, for control unit 2 provides power supply

Refer to Fig. 8, in above-mentioned specific embodiment, braking lockout circuit and fault recognition circuit comprise terminal X38, optocoupler U2, voltage-stabiliser tube D8, diode D9, resistance R 20, resistance R 21, by terminal X38 access GND.

Refer to Fig. 9, in above-mentioned specific embodiment, fault message output circuit comprises terminal X38, optocoupler U1, metal-oxide-semiconductor U3, diode D10～D12, resistance R 22～R24, the level of exporting by the port 5 of detection terminal X38 confirms to formulate the working condition of unit, as whether having fault, whether be blocked styate etc.

Above embodiment of the present utility model is had been described in detail, but described content is only preferred embodiment of the present utility model, can not be considered to for limiting practical range of the present utility model.All equalization variations of doing according to the utility model application range and improvement etc., within all should still belonging to patent covering scope of the present utility model.

Claims

1. an intelligent brake unit, comprising: brake resistance, for controlling IGBT switching circuit and the power subsystem of described brake resistance work; It is characterized in that: also comprise: for controlling the control unit of described IGBT switching circuit work; The signal output port of described control unit is electrically connected to by IGBT driver element and IGBT switching circuit, on described IGBT switching circuit, is provided with temperature detecting unit, and described temperature detecting unit is electrically connected to the signal input port of described control unit.

2. intelligent brake unit according to claim 1, is characterized in that: also comprise the braking lockout circuit, fault recognition circuit and the reset circuit that are electrically connected to described control unit.

3. intelligent brake unit according to claim 2, is characterized in that: described control unit is that model is the single-chip microcomputer of MSP430F1232.

4. intelligent brake unit according to claim 3, is characterized in that: described IGBT switching circuit comprises IGBT pipe T1～T8, and the grid of described IGBT pipe T1～T8 is electrically connected to described IGBT driver element by resistance R 21～R28.

5. intelligent brake unit according to claim 4, it is characterized in that: described IGBT driver element comprises two identical electronic circuits, one of them electronic circuit comprises NPN transistor T13 and PNP transistor T11, and the collector electrode of described NPN transistor T13 is connected with 15V power supply electricity by resistance R 27; Between the base stage of NPN transistor T13 and emitter, be connected to resistance R 39, the collector electrode of NPN transistor T13 is by capacitor C 11 ground connection.

6. intelligent brake unit according to claim 5, it is characterized in that: described temperature detecting unit comprises temperature sensor and pulse transformer TRANS1, wherein: temperature sensor is connected with the secondary coil of pulse transformer TRANS1, the primary coil of pulse transformer TRANS1 is electrically connected to the signal input terminal of single-chip microcomputer.