CN103219932A

CN103219932A - Temperature self-balancing overheating protection brushless direct current motor driver for bread maker

Info

Publication number: CN103219932A
Application number: CN2013100940116A
Authority: CN
Inventors: 李月红
Original assignee: FGSL Electric Co Ltd
Current assignee: FGSL Electric Co Ltd
Priority date: 2013-03-22
Filing date: 2013-03-22
Publication date: 2013-07-24
Anticipated expiration: 2033-03-22
Also published as: CN103219932B

Abstract

A temperature self-balancing overheating protection brushless direct current motor driver for a bread maker comprises a control chip, a rotation speed measuring output circuit, a rotation speed control input circuit, a Hall rotor position sensor detection circuit, a temperature measuring circuit, an intelligent power module (IPM) power module circuit and an over-current detection circuit, and is characterized in that the control chip is a 120-degree hardware drive control chip and adopts an upper arm pulse-width modulation (PWM) control mode, the oscillation frequency is set as 20KHz, the rotation speed control voltage is set between 1.7V and 6.0V, the temperature measuring circuit is connected with the rotation speed control input circuit in parallel and comprises a positive temperature coefficient thermistor R23 and a triode transistor Q2, and the over-current detection circuit is connected with the IPM power module circuit in parallel. The temperature self-balancing overheating protection brushless direct current motor driver for the bread maker has the functions of over-current self-balancing overheating protection, undervoltage self-balancing overheating protection and temperature self-balancing overheating protection.

Description

A kind of bread producing machine is with temperature self-balanced overtemperature protection driver for brushless DC motor

Technical field:

The present invention relates to the temperature self-balanced circuit of a kind of bread producing machine, particularly relate to a kind of bread producing machine with temperature self-balanced overtemperature protection driver for brushless DC motor.

Technical background:

The bread brushless DC motor is made up of driver and motor body two major parts, and wherein driver for brushless DC motor is its core component.Traditional bread producing machine is lower with alternating current machine efficient, generally between 30%～40%, electromagnetic noise is big, deterioration along with global climate, construction resource-conserving, environmentally friendly society are generally approved by each country, energy-efficient product becomes the new product that each country encourages exploitation and uses, and dc brushless motor is the energy saving and environment friendly product of a kind of high efficiency, low noise, is the desirable substitute products of the alternating current machine of original poor efficiency.

Summary of the invention:

Purpose of the present invention is exactly to design a kind of driver for brushless DC motor that has temperature self-balanced overheat protective function that is used for bread producing machine.

The object of the present invention is achieved like this: a kind of bread producing machine is with temperature self-balanced overtemperature protection driver for brushless DC motor, comprise: control chip, tachometric survey output loop, rotating speed control input circuit, Hall rotor-position sensor detect loop, temperature survey loop, IPM power model loop, over-current detection loop, it is characterized in that: described control chip adopts 120 degree hardware driving control chips, upper arm PWM control mode, frequency of oscillation is set to 20KHz, and rotating speed control voltage is at 1.7V～6.0v; Described temperature survey loop is connected in parallel on the rotating speed control input circuit, and it includes semistor R23 and transistor Q2; The over-current detection loop is connected in parallel on the IPM power model loop.

The exportable 4 pulse/commentaries on classics of the level state of the FGS pin in described hardware driving controller loop (1) or 12 pulse/commentaries on classics.

Described Hall rotor-position sensor detects and adopts Hall ELEMENT as rotor position detecting sensor in the loop.

The present invention has functions such as overcurrent, under-voltage, temperature self-balanced overtemperature protection.The present invention adopts semistor and compound digital transistor to make up; and utilize transistor under certain base voltage, to work in the characteristic of amplification region; thereby reach the effect of self-balancing heat protection; security of products and applicability have been improved; this activation configuration compactness; circuit simply meets the requirement of built-in motor driver, is convenient to large-scale mass production.

Description of drawings:

Fig. 1 is a circuit diagram of the present invention;

Fig. 2 is a control chip circuit diagram among Fig. 1;

Fig. 3 is that Fig. 1 medium speed is measured the output loop circuit diagram;

Fig. 4 is Fig. 1 medium speed control input circuit circuit diagram;

Fig. 5 is Hall rotor position detection loop circuit figure among Fig. 1;

Fig. 6 is temperature survey loop circuit figure among Fig. 1;

Fig. 7 is IPM power model loop circuit figure among Fig. 1;

Fig. 8 is over-current detection loop circuit figure among Fig. 1.

Among the figure 1, control chip, 2, the tachometric survey output loop, 3, rotating speed control input circuit, 4, Hall rotor position detection loop, 5, the temperature survey loop, 6, IPM power model loop, 7, the over-current detection loop.

Embodiment

The invention will be further described below in conjunction with accompanying drawing 1:

A kind of bread producing machine is with temperature self-balanced overtemperature protection driver for brushless DC motor; comprise: control chip 1; tachometric survey output loop 2; rotating speed control input circuit 3; the Hall rotor-position sensor detects loop 4; temperature survey loop 5; IPM power model loop 6; over-current detection loop 7; because bread producing machine needs low rotation speed large torque; so we have selected 120 degree hardware driving control chips of the employing upper arm PWM control mode that ROHM company produces for use control chip 1; in order to reduce switch noise; its frequency of oscillation is set at 20KHz; rotating speed control voltage changes in 1.7V～6.0V scope; when rotating speed control voltage is 6.0V; corresponding PWM duty ratio is MAX95%; rotating speed control voltage MIN is 1.7V～2.5V; motor stops operating when being lower than 1.7V; when rotating speed is controlled voltage greater than 2.5V; control chip 1 is by detecting the level state that three Hall rotor-position sensors detect loop 4; determine the commutation moment and 6 tunnel corresponding output commutation states; built-in predrive circuit by IPM power model loop 6 amplifies 6 tunnel drive signals and drives 6 MOSFET power transistors; the square wave that is differed 120 degree electrical degrees by the power transistor output phase drives three phase windings; thereby produce three phase rotating field and come the drive motors running; when controlling voltage from 1.7V(min from the rotating speed of Vsp terminal input) when rising gradually; the PWM duty ratio also rises gradually from zero; the line voltage that is applied on three phase windings also rises gradually; motor speed also rises synchronously, and vice versa.Control chip 1 inside also generates two kinds of tach signals according to the variable condition of hall signal and exports to upper control computer by tachometric survey output circuit (Q1, R12) when motor rotates, the needs different according to the client are by the exportable 4 pulse/commentaries on classics of the level state that control chip (1) FGS pin is set and 12 pulse/commentaries on classics.(R29, R30, R32, C21) is the current detecting output circuit, and when the Idc terminal voltage reached 0.5V, control chip (1) turn-offed 6 tunnel output signals, and motor stops operating.(R22; R23; R3; Q2) be temperature measuring circuit; R23 is a semistor; when motor overload operation or generation abnormality; rising along with motor temperature; the resistance value of R23 also constantly changes; the bias voltage of Q2 base stage also constantly rises; when rising to certain value; Q2 starts working in the amplification region; and temperature measuring circuit is connected in parallel on by (R7; C6; R22) on the rotating-speed control circuit of Gou Chenging; will inevitably drag down the rotating speed control voltage of Vsp1; thereby the duty ratio of PWM is descended; motor changes band and descends; the motor power output descends; motor temperature descends gradually; Q2 ends after temperature descends; motor continues to recover rated speed; thereby reach a kind of dynamic balance state; rather than resemble traditional temperature protection and simply directly allow motor stop moving the commentaries on classics; this temperature protection mode can allow driver for brushless DC motor be used in the special occasions that some can not shut down; expanded its range of application, this temperature self-balanced overtemperature protection driver for brushless DC motor is applied on the bread producing machine dc brushless motor product, has obtained Japanese client's approval and favorable comment.

Claims

1. a bread producing machine is with temperature self-balanced overtemperature protection driver for brushless DC motor, comprise: control chip (1), tachometric survey output loop (2), rotating speed control input circuit (3), Hall rotor-position sensor detect loop (4), temperature survey loop (5), IPM power model loop (6), over-current detection loop (7), it is characterized in that: described control chip (1) adopts 120 degree hardware driving control chips, upper arm PWM control mode, frequency of oscillation is set to 20KHz, and rotating speed control voltage is at 1.7V～6.0v; Described temperature survey loop (5) is connected in parallel on the rotating speed control input circuit (3), and it includes semistor R23 and transistor Q2; Over-current detection loop (7) is connected in parallel on the IPM power model loop (6).

2. a kind of bread producing machine according to claim 1 is characterized in that: the exportable 4 pulse/commentaries on classics of the level state of the FGS pin in described hardware driving controller loop (1) or 12 pulse/commentaries on classics with temperature self-balanced overtemperature protection driver for brushless DC motor.

3. a kind of bread producing machine according to claim 1 is characterized in that: adopt Hall ELEMENT as rotor position detecting sensor in the described Hall rotor-position sensor detection loop (3) with temperature self-balanced overtemperature protection driver for brushless DC motor.