CN104753404A - Fan motor brake device and control method thereof - Google Patents
Fan motor brake device and control method thereof Download PDFInfo
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- CN104753404A CN104753404A CN201310731819.0A CN201310731819A CN104753404A CN 104753404 A CN104753404 A CN 104753404A CN 201310731819 A CN201310731819 A CN 201310731819A CN 104753404 A CN104753404 A CN 104753404A
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Abstract
The invention discloses a fan motor brake device for providing brake protection before a fan motor starts, which comprises a conversion circuit, a brake enabling circuit, a brake release circuit and a fan motor start circuit, wherein the conversion circuit is provided with multiple power switch elements and electrically connected with the fan motor; the brake enabling circuit is connected with the conversion circuit; the brake release circuit is connected with the brake enabling circuit; and the fan motor start circuit receives an outer DC voltage. When the brake enabling circuit receives the outer DC voltage, the brake enabling circuit generates a brake control signal to conduct the power switch elements so as to brake the fan motor.
Description
Technical field
The present invention is about a kind of fan motor brake gear and control method thereof, and espespecially a kind of have fan motor brake gear and the control method thereof that fan motor starts front brake defencive function.
Background technology
Refer to Fig. 1, Fig. 1 is the circuit diagram that the fan motor of prior art drives.As shown in the figure, this fan motor drive circuit structure comprises a change-over circuit 10A, a driving governor 20A and a fan motor 50A.This change-over circuit 10A has multiple power switch component Q1 ~ Q6, and is electrically connected this fan motor 50A.Be a three-phase dc motor for this fan motor 50A, this change-over circuit 10A is three groups of brachium pontis frameworks in parallel each other, and each group brachium pontis is connected in series by two power switch components.This change-over circuit 10A receives an external dc voltage Vdc, and is converted to the electric power needed for this fan motor 50A.Moreover this driving governor 20A produces should six switching drive signal Sd1 ~ Sd6 of six switch element Q1 ~ Q6, and by switching and driving those switch elements Q1 ~ Q6, makes this fan motor 50A operate.
Generally, this fan motor above-mentioned can be applicable to server machine room as air conditioner and heat radiation use.But, because in server machine room, the setting of servo is different from behaviour in service, therefore, the fan motor not starting running is easily subject to the return air that fan motor produces around to be affected, cause the labile state before starting running, more very return air will make fan motor reverse, and so, fan motor will be caused to continue reverse and cannot start smoothly and even burn.
Therefore, how to design a kind of fan motor brake gear and control method thereof, by this fan motor brake gear, to guarantee fan motor before activation for halted state, make fan motor not reason external force reverse cause burning or cannot starting smoothly; And utilize simple electronic component; realize the startup running of the brake releasing after the brake protection before fan motor startup, brake stopping and fan motor; can under the condition of simple circuit design; reach high accurancy and precision brake protection, remove and start running control, be by inventor institute wish go overcome and solve one large problem.
Summary of the invention
An object of the present invention is to provide a kind of fan motor brake gear, the brake protection before starting to provide a fan motor.This fan motor brake gear comprises a change-over circuit, a brake enable circuit, brake relieving circuit and a fan motor start-up circuit.This change-over circuit has multiple power switch component, and is electrically connected this fan motor; Wherein those power switch components form many group upper and lower bridge arm circuit frameworks.This brake enable circuit connects this change-over circuit, and receives an external dc voltage.This brake relieving circuit connects this brake enable circuit, and receives this external dc voltage, with the one first resistance-capacitance circuit charging had this brake enable circuit.This fan motor start-up circuit receives this external dc voltage.Wherein, when this brake enable circuit receives this external dc voltage, this brake enable circuit produces those power switch components of brachium pontis under a brake control signal conducting, to brake to this fan motor; When this brake relieving circuit of activation after the charging of this first resistance-capacitance circuit, to stop this brake enable circuit to export lower those power switch components of brachium pontis of this brake control signal cut-off, and then remove the brake of this fan motor.
Another object of the present invention is to provide a kind of fan motor brake gear, the brake protection before starting to provide a fan motor.This fan motor brake gear comprises a change-over circuit, a brake enable circuit, brake relieving circuit and a fan motor start-up circuit.This change-over circuit has multiple power switch component, multiple auxiliary power switch element and multiple current-limiting resistance, and is electrically connected this fan motor; Wherein those power switch components form many group upper and lower bridge arm circuit frameworks, and each this auxiliary power switch element is connected with this power switch component of lower brachium pontis by this current-limiting resistance.This brake enable circuit connects this change-over circuit, and receives an external dc voltage.This brake relieving circuit connects this brake enable circuit, and receives this external dc voltage, with the one first resistance-capacitance circuit charging had this brake relieving circuit.This fan motor start-up circuit receives this external dc voltage.Wherein, when this brake enable circuit receives this external dc voltage, this brake enable circuit produces the plurality of auxiliary power switch element of a brake control signal conducting, to brake to this fan motor; When this brake relieving circuit of activation after the charging of this first resistance-capacitance circuit, export this brake control signal to stop this brake enable circuit and end those auxiliary power switch elements, and then remove the brake of this fan motor.
Another object more of the present invention is to provide a kind of fan motor brake gear control method, the brake protection before starting to provide a fan motor.This control method comprises the following step: (a) provides a change-over circuit with multiple power switch component, and wherein this change-over circuit is electrically connected this fan motor; And (b) one external dc voltage turn-on one to brake enable circuit, to produce those power switch components of brake control signal conducting, and then this fan motor is braked.
In order to technology, means and effect that the present invention takes for reaching predetermined object further can be understood, refer to following detailed description for the present invention and accompanying drawing, believe object of the present invention, feature and feature, go deep into and concrete understanding when one can be obtained thus, but institute's accompanying drawings only provides reference and explanation use, is not used for being limited the present invention.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that the fan motor of prior art drives;
Fig. 2 A is the circuit module schematic diagram of fan motor brake gear of the present invention in a preferred embodiment;
Fig. 2 B is the circuit module schematic diagram of fan motor brake gear of the present invention in another preferred embodiment;
Fig. 3 is the circuit diagram of fan motor brake gear of the present invention; And
Fig. 4 is the flow chart of fan motor brake gear control method of the present invention.
Wherein, description of reference numerals is as follows:
﹝ Xian You Ji Shu ﹞
10A change-over circuit
20A driving governor
50A fan motor
Vdc external dc voltage
Q1 ~ Q6 power switch component
Sd1 ~ Sd6 switching drive signal
This Fa of ﹝ Ming ﹞
10 change-over circuits
20 brake enable circuits
30 brake relieving circuits
40 fan motor start-up circuits
50 fan motors
Df diode
Q1 first power switch component
Q2 second power switch component
Q3 the 3rd power switch component
Q4 the 4th power switch component
Q5 the 5th power switch component
Q6 the 6th power switch component
Q2 ' first auxiliary power switch element
Q4 ' second auxiliary power switch element
Q6 ' the 3rd auxiliary power switch element
R2 first current-limiting resistance
R4 second current-limiting resistance
R6 the 3rd current-limiting resistance
Vcc external dc voltage
Sc brake control signal
Resistance is removed in R30 brake
Electric capacity is removed in C30 brake
R40 starting resistance
C40 start-up capacitance
Q201 first brake activation power switch
Q202 second brakes activation power switch
Power switch is removed in Q30 brake
Q401 first starting power switch
Q402 second starting power switch
S10 ~ S40 step
Embodiment
Hereby the technical content and a detailed description for the present invention, coordinate graphic being described as follows:
Referring to Fig. 2 A is the circuit module schematic diagram of fan motor brake gear of the present invention in a preferred embodiment.Brake protection before this fan motor brake gear provides a fan motor 50 to start.This fan motor brake gear comprises change-over circuit 10, brake enable circuit 20, brake relieving circuit 30 and a fan motor start-up circuit 40.This change-over circuit 10 has multiple power switch component, and is electrically connected this fan motor 50.
As shown in Figure 2 A, in this preferred embodiment, this fan motor 50 is a three-phase dc motor (three-phase DC motor), therefore, this change-over circuit 10 corresponding is three groups of brachium pontis frameworks in parallel each other, and each group brachium pontis is connected in series by two power switch components.That is one first power switch component Q1 and one second power switch component Q2 is connected in series formation one first brachium pontis (sign); One the 3rd power switch component Q3 and the 4th power switch component Q4 is connected in series formation one second brachium pontis (sign); One the 5th power switch component Q5 and the 6th power switch component Q6 is connected in series formation 1 the 3rd brachium pontis (sign).Moreover each brachium pontis two switch element electrical connection place is electrically connected with a phase of this fan motor 50 respectively, to form the control framework of a three-phase dc motor.Be worth mentioning, the present invention is not limited with the control framework of this three-phase dc motor above-mentioned, this fan motor 50 can be a single-phase DC motor (single-phase DC motor), and forms the control framework of a single-phase DC motor with corresponding change-over circuit 10.
This brake enable circuit 20 connects this change-over circuit 10, and receives an external dc voltage vcc.More specifically, this brake enable circuit 20 connects this second power switch component Q2, the 4th power switch component Q4 and the 6th power switch component Q6 of this change-over circuit 10.This brake relieving circuit 30 connects this brake enable circuit 20, and receives this external dc voltage vcc.This fan motor start-up circuit 40 receives this external dc voltage vcc.
When this this brake enable circuit 20 of external dc voltage vcc conducting, this brake enable circuit 20 produces those power switch components of brake control signal Sc conducting, to brake to this fan motor 50, guarantees that this fan motor 50 is halted state before activation.More specifically, when this this brake enable circuit 20 of external dc voltage vcc conducting, this brake enable circuit 20 produces the grid that this brake control signal Sc inputs to this second power switch component Q2, the 4th power switch component Q4 and the 6th power switch component Q6 simultaneously, with while conducting this second power switch component Q2, the 4th power switch component Q4 and the 6th power switch component Q6, make this three brachium pontis ground connection simultaneously, and this fan motor 50 is braked.
When the brake of this fan motor 50 stops, this this brake enable circuit 20 of brake relieving circuit 30 forbidden energy, to stop this brake enable circuit 20 to export this brake control signal Sc, makes to end those power switch components, and then removes this fan motor 50 and brake.More specifically, when the brake of this fan motor 50 stops, this this brake enable circuit 20 of brake relieving circuit 30 forbidden energy, stop exporting the grid of this brake control signal Sc to this second power switch component Q2, the 4th power switch component Q4 and the 6th power switch component Q6 simultaneously, make this three brachium pontis not simultaneously ground connection, and remove this fan motor 50 and brake.When brake removed by this fan motor 50, this fan motor start-up circuit 40 receives this external dc voltage vcc, operates to start this fan motor 50.
More specifically, when brake removed by this fan motor 50, this fan motor start-up circuit 40 receives this external dc voltage vcc, to provide this external dc voltage vcc to this change-over circuit 10, to be converted to the electric power needed for this fan motor 50, and, then coordinate driving governor (not shown), to switch and to drive those power switch components, this fan motor 50 is operated.Wherein, this fan motor brake gear also comprises a diode Df, this diode Df is electrically connected between this change-over circuit 10 and this fan motor start-up circuit 40, to guarantee that this external dc voltage vcc is provided to this change-over circuit 10 by this fan motor start-up circuit 40, to be converted to the electric power needed for this fan motor 50.
Be worth mentioning, the preferred embodiment shown in Fig. 2 A is only an execution mode of fan motor brake gear of the present invention, but not as restriction.Referring to Fig. 2 B is the circuit module schematic diagram of fan motor brake gear of the present invention in another preferred embodiment.This embodiment of Fig. 2 B and this embodiment maximum difference of Fig. 2 A are: each of this change-over circuit 10 is organized brachium pontis and also comprised an auxiliary power switch element and a current-limiting resistance.More specifically, the grid (gate) of this second power switch component Q2 is connected with the source electrode (source) of one first auxiliary power switch element Q2 ' by one first current-limiting resistance R2, further, the drain electrode (drain) of this first auxiliary power switch element Q2 ' is powered by this external dc voltage vcc.In like manner, the grid of the 4th power switch component Q4 is connected with the source electrode of one second auxiliary power switch element Q4 ' by one second current-limiting resistance R4, and the drain electrode of this second auxiliary power switch element Q4 ' is powered by this external dc voltage vcc.In like manner, the grid of the 6th power switch component Q6 is connected with the source electrode of one the 3rd auxiliary power switch element Q6 ' by one the 3rd current-limiting resistance R6, and the drain electrode of the 3rd auxiliary power switch element Q6 ' is powered by this external dc voltage vcc.Be worth mentioning, this brake control signal Sc that the grid of the grid of this first auxiliary power switch element Q2 ', the grid of this second auxiliary power switch element Q4 ' and the 3rd auxiliary power switch element Q6 ' is produced by this brake enable circuit 20 simultaneously controls.As for this fan motor brake gear and control method thereof, more detailed description will be had later.
Refer to the circuit diagram that Fig. 3 is fan motor brake gear of the present invention.In this embodiment, further illustrate the operation that the circuit element of this brake enable circuit 20, this brake relieving circuit 30 and this fan motor start-up circuit 40 is corresponding with it.Wherein, this brake enable circuit 20, this brake relieving circuit 30 and this fan motor start-up circuit 40 can be realized by the hardware designs of electronic circuit, but not as restriction, also the brake that those circuit above-mentioned provide and the function starting this fan motor 50 can be realized by software or firmware.Below, will illustrate that for the hardware designs of electronic circuit this brake enable circuit 20, this brake relieving circuit 30 and this fan motor start-up circuit 40 realize brake that those circuit above-mentioned provide and the function starting this fan motor 50 and principle.
This brake enable circuit 20, this brake relieving circuit 30 and this fan motor start-up circuit 40 are made up of electronic circuit components such as power switch component, resistance, electric capacity respectively.This brake enable circuit 20 mainly comprises a first brake activation power switch Q201, one second brake activation power switch Q202 and is electrically connected at this first brake activation power switch Q201 and this second resistance (sign) braked between activation power switch Q202.This brake relieving circuit 30 mainly comprises a brake and removes power switch Q30, a brake releasing resistance R30 and brake releasing electric capacity C30.The resistance (sign) that this fan motor start-up circuit 40 mainly comprises one first starting power switch Q401, one second starting power switch Q402, a starting resistance R40, a start-up capacitance C40 and is electrically connected between this first starting power switch Q401 and this second starting power switch Q402.
When this fan motor brake gear receives this external dc voltage vcc, because this brake enable circuit 20, this brake relieving circuit 30 and this fan motor start-up circuit 40 all directly connect this external dc voltage vcc, therefore this external dc voltage vcc starts power supply to this brake enable circuit 20, this brake relieving circuit 30 and this fan motor start-up circuit 40 simultaneously.Because this external dc voltage vcc is powered to this brake enable circuit 20, therefore this external dc voltage vcc conducting this first brake activation power switch Q201 and this second to brake activation power switch Q202, make this brake enable circuit 20 export this brake control signal Sc.Be worth mentioning, this brake control signal Sc is the control signal of a high level, therefore input to the grid of this first auxiliary power switch element Q2 ', this second auxiliary power switch element Q4 ' and the 3rd auxiliary power switch element Q6 ' simultaneously, with while conducting this second power switch component Q2, the 4th power switch component Q4 and the 6th power switch component Q6, make this three brachium pontis ground connection simultaneously, and this fan motor 50 is braked.
In addition, while this external dc voltage vcc is to the power supply of this brake enable circuit 20, also this brake relieving circuit 30 and this fan motor start-up circuit 40 are powered simultaneously, therefore, this external dc voltage vcc is removed resistance R30 and this brake to this brake of this brake relieving circuit 30 and is removed the RC circuit that electric capacity C30 formed and start to charge, on the other hand, this external dc voltage vcc also starts to charge to the 2nd RC circuit that this starting resistance R40 and this start-up capacitance C40 of this fan motor start-up circuit 40 are formed.Be worth mentioning, in an embodiment of the present invention, the time constant (τ 1) of time constant (time constant τ 2) the design comparatively RC circuit of the 2nd RC circuit is come long, in other words, and τ 2=R40 × C40> τ 1=R30 × C30.Therefore, after this external dc voltage vcc charges to a RC circuit and the 2nd RC circuit simultaneously, the voltage rise that in a RC circuit, electric capacity C30 is removed in this brake comparatively in the 2nd RC circuit the voltage rise of this start-up capacitance C40 come soon.So when the charging voltage that electric capacity C30 is removed in this brake reaches enough high voltage level, power switch Q30 is removed in this brake of first conducting, this first brake activation power switch Q201 and this second activation power switch Q202 that brakes is ended.So, this brake enable circuit 20 stops exporting the grid of this brake control signal Sc to this first auxiliary power switch element Q2 ', this second auxiliary power switch element Q4 ' and the 3rd auxiliary power switch element Q6 ' simultaneously, make this three brachium pontis not simultaneously ground connection, and remove this fan motor 50 and brake.
Then when the charging voltage of this start-up capacitance C40 reaches enough high voltage level, then conducting this first starting power switch Q401 and this second starting power switch Q402, this external dc voltage vcc is made to provide this to this change-over circuit 10 by this fan motor start-up circuit 40, and coordinate driving governor to switch and drive those power switch components, external dc voltage vcc to be converted to the electric power needed for this fan motor 50, this fan motor 50 is operated.
In addition; this change-over circuit 10 shown in Fig. 3 also can not adopt the mode of this auxiliary power switch element and current-limiting resistance; in other words; this brake control signal Sc directly exports the grid of this second power switch component Q2, the 4th power switch component Q4 and the 6th power switch component Q6 to, reaches and provides the defencive function of the brake before startup to this fan motor 50.Therefore, can coordinate the correspondence of Fig. 2 A that enforcement is described, not repeat them here.
Refer to the flow chart that Fig. 4 is fan motor brake gear control method of the present invention.This fan motor brake gear control method, the brake protection before starting to provide a fan motor.This control method comprises the following step: first, provides a change-over circuit with multiple power switch component, and wherein this change-over circuit is electrically connected this fan motor (S10).Wherein, this fan motor can be a three-phase dc motor (three-phase DC motor) or a single-phase DC motor (single-phase DC motor), not as restriction, and, this change-over circuit to should d.c. motor form different, can be the control framework of three-phase or single-phase DC motor.Then, an external dc voltage turn-on one brakes enable circuit, to produce those power switch components of brake control signal conducting, and then brakes to this fan motor, guarantees that this fan motor is halted state (S20) before activation.This brake enable circuit connects this change-over circuit.For the control framework of three-phase dc motor, when this brake enable circuit receives this external dc voltage, this brake enable circuit exports the conducting simultaneously of this brake control signal, makes this three brachium pontis ground connection simultaneously, and brakes to this fan motor.
Then, this brake enable circuit of brake relieving circuit forbidden energy, to stop this brake enable circuit to export this brake control signal, makes to end those power switch components, and then removes this fan motor brake (S30).More specifically, when the brake of this fan motor stops, this this brake enable circuit of brake relieving circuit forbidden energy, stops exporting this brake control signal simultaneously, the ground connection while of making this three brachium pontis not, and removes the brake of this fan motor.Finally, a fan motor start-up circuit receives this external dc voltage, to start this fan motor running (S40).
Be worth mentioning, this brake enable circuit above-mentioned, this brake relieving circuit and this fan motor start-up circuit can be realized by the hardware designs of electronic circuit, but not as restriction, also the brake that those circuit above-mentioned provide and the function starting this fan motor can be realized by software or firmware.Be embodied as example with the hardware designs of electronic circuit, this brake enable circuit, this brake relieving circuit and this fan motor start-up circuit are made up of electronic circuit components such as power switch component, resistance, electric capacity respectively.This brake enable circuit mainly comprises a first brake activation power switch, one second brake activation power switch and is electrically connected at this first brake activation power switch and this second resistance braked between activation power switch.This brake relieving circuit mainly comprises a brake and removes power switch, a brake releasing resistance and a brake releasing electric capacity.The resistance that this fan motor start-up circuit mainly comprises one first starting power switch, one second starting power switch, a starting resistance, a start-up capacitance and is electrically connected between this first starting power switch and this second starting power switch.
When this fan motor brake gear receives this external dc voltage, because this brake enable circuit, this brake relieving circuit and this fan motor start-up circuit all directly connect this external dc voltage, therefore this external dc voltage starts power supply to this brake enable circuit, this brake relieving circuit and this fan motor start-up circuit simultaneously.Because this external dc voltage is powered to this brake enable circuit, therefore this first brake activation power switch of this external dc voltage turn-on and this second to brake activation power switch, make this brake enable circuit produce this brake control signal.Be worth mentioning, this brake control signal is the control signal of a high level, therefore inputs to the underarm switch element of three brachium pontis simultaneously, with while conducting three brachium pontis underarm switch element, make this three brachium pontis ground connection simultaneously, and this fan motor braked.
In addition, while this external dc voltage is powered to this brake enable circuit, also this brake relieving circuit and this fan motor start-up circuit are powered simultaneously, therefore, this external dc voltage is removed resistance and this brake to this brake of this brake relieving circuit and is removed the RC circuit that electric capacity formed and start to charge, on the other hand, this external dc voltage also starts to charge to the 2nd RC circuit that this starting resistance and this start-up capacitance of this fan motor start-up circuit are formed.Be worth mentioning, in the present invention, the time constant (τ 1) of the time constant (time constant τ 2) of a 2nd RC circuit design comparatively RC circuit is come long, in other words, and τ 2> τ 1.Therefore, after this external dc voltage charges to a RC circuit and the 2nd RC circuit simultaneously, the voltage rise that in a RC circuit, electric capacity is removed in this brake comparatively in the 2nd RC circuit the voltage rise of this start-up capacitance come soon.So, when this brake remove the charging voltage of electric capacity reach enough high voltage level time, power switch is removed in this brake of first conducting, and this first brake activation power switch and this second activation power switch that brakes are ended.So, this brake enable circuit stops exporting the grid of this brake control signal to this second power switch component, the 4th power switch component and the 6th power switch component simultaneously, the ground connection while of making this three brachium pontis not, and remove the brake of this fan motor.
Then when the charging voltage of this start-up capacitance reaches enough high voltage level, then this first starting power switch of conducting and this second starting power switch, this external dc voltage is made to provide this to this change-over circuit by this fan motor start-up circuit, and coordinate driving governor to switch and drive those power switch components, to make this fan motor operate the external dc voltage vcc electric power be converted to needed for this fan motor.
In sum, the present invention has following feature & benefits:
1, by this fan motor brake gear, to guarantee fan motor before activation for halted state, make fan motor not reason external force reverse cause burning or cannot starting smoothly;
2, simple electronic component is utilized, such as transistor, resistance, electric capacity, realize the startup running of the brake releasing after the brake protection before fan motor startup, brake stopping and fan motor, under the condition of simple circuit design, the brake protection of high accurancy and precision can be reached, removes and start the control of running; And
3, this fan motor brake gear is applicable to the control framework of three-phase or single-phase DC motor, and this brake enable circuit 20, this brake relieving circuit 30 and this fan motor start-up circuit 40 can be realized by the hardware designs of electronic circuit, also the brake that those circuit above-mentioned provide and the function starting this fan motor 50 can be realized by software or firmware, the application making this fan motor brake gear more elasticity, extensively.
Only, the above, be only the detailed description of preferred embodiment of the present invention and graphic, only feature of the present invention is not limited thereto, and be not used to limit the present invention, all scopes of the present invention should be as the criterion with following right of applying for a patent, all embodiments of closing spirit change similar with it in the present patent application Patent right requirement scope, all should be contained in category of the present invention, any those skilled in the art in the field of the invention, can think easily and change or modify all can be encompassed in Patent right requirement scope of the present invention.
Claims (20)
1. a fan motor brake gear, the brake protection before starting to provide a fan motor, this fan motor brake gear comprises:
One change-over circuit, has multiple power switch component, and is electrically connected this fan motor; Wherein the plurality of power switch component forms many group upper and lower bridge arm circuit frameworks;
One brake enable circuit, connects this change-over circuit, and receives an external dc voltage;
One brake relieving circuit, connects this brake enable circuit, and receives this external dc voltage, with the one first resistance-capacitance circuit charging had this brake relieving circuit; And
One fan motor start-up circuit, receives this external dc voltage;
Wherein, when this brake enable circuit receives this external dc voltage, this brake enable circuit produces the plurality of power switch component of brachium pontis under a brake control signal conducting, to brake to this fan motor; When this brake relieving circuit of activation after the charging of this first resistance-capacitance circuit, to stop this brake enable circuit to export the lower the plurality of power switch component of brachium pontis of this brake control signal cut-off, and then remove the brake of this fan motor.
2. fan motor brake gear as claimed in claim 1, wherein when this brake relieving circuit is enabled, this fan motor start-up circuit receives this external dc voltage, to start the running of this fan motor.
3. fan motor brake gear as claimed in claim 1, wherein this brake enable circuit comprises a first brake activation power switch and one second and to brake activation power switch; Wherein this first brake activation power switch connects this second brake activation power switch; And this brake control signal is exported by this first brake activation power switch.
4. fan motor brake gear as claimed in claim 3, wherein this brake relieving circuit comprises a brake releasing power switch, resistance is removed in a brake and electric capacity is removed in a brake; Wherein this brake is removed resistance and this brake and is removed electric capacity and form this first resistance-capacitance circuit, then removes power switch with this brake and be electrically connected.
5. fan motor brake gear as claimed in claim 4, wherein this fan motor start-up circuit comprises one first starting power switch, one second starting power switch, a starting resistance and a start-up capacitance; Wherein this starting resistance and this start-up capacitance form one second resistance-capacitance circuit, then are electrically connected with this second starting power switch.
6. fan motor brake gear as claimed in claim 5, wherein the time constant of this second resistance-capacitance circuit is greater than the time constant of this first resistance-capacitance circuit.
7. fan motor brake gear as claimed in claim 6, wherein when this brake relieving circuit is enabled, this fan motor start-up circuit receives this external dc voltage, to start the running of this fan motor.
8. fan motor brake gear as claimed in claim 1, wherein this fan motor brake gear also comprises:
One diode, is electrically connected between this change-over circuit and this fan motor start-up circuit, to guarantee that this external dc voltage is provided to this change-over circuit by this fan motor start-up circuit, to be converted to the electric power needed for this fan motor.
9. fan motor brake gear as claimed in claim 1, wherein this fan motor is a three-phase dc motor or a single-phase DC motor, and this change-over circuit should be a three-phase circuit framework or a single phase circuit framework relatively.
10. a fan motor brake gear, the brake protection before starting to provide a fan motor, this fan motor brake gear comprises:
One change-over circuit, has multiple power switch component, multiple auxiliary power switch element and multiple current-limiting resistance, and is electrically connected this fan motor; Wherein the plurality of power switch component forms many group upper and lower bridge arm circuit frameworks, and each this auxiliary power switch element is connected with this power switch component of lower brachium pontis by this current-limiting resistance;
One brake enable circuit, connects this change-over circuit, and receives an external dc voltage;
One brake relieving circuit, connects this brake enable circuit, and receives this external dc voltage, with the one first resistance-capacitance circuit charging had this brake relieving circuit; And
One fan motor start-up circuit, receives this external dc voltage;
Wherein, when this brake enable circuit receives this external dc voltage, this brake enable circuit produces the plurality of auxiliary power switch element of a brake control signal conducting, to brake to this fan motor; When this brake relieving circuit of activation after the charging of this first resistance-capacitance circuit, export this brake control signal to stop this brake enable circuit and end the plurality of auxiliary power switch element, and then remove the brake of this fan motor.
11. as the fan motor brake gear of claim 10, and wherein this brake enable circuit comprises a first brake activation power switch and one second and to brake activation power switch; Wherein this first brake activation power switch connects this second brake activation power switch; And this brake control signal is exported by this first brake activation power switch; This brake relieving circuit comprises a brake and removes power switch, a brake releasing resistance and a brake releasing electric capacity; Wherein this brake is removed resistance and this brake and is removed electric capacity and form this first resistance-capacitance circuit, then removes power switch with this brake and be electrically connected; Wherein this fan motor start-up circuit comprises one first starting power switch, one second starting power switch, a starting resistance and a start-up capacitance; Wherein this starting resistance and this start-up capacitance form one second resistance-capacitance circuit, then are electrically connected with this second starting power switch.
12. as the fan motor brake gear of claim 11, and wherein the time constant of this second resistance-capacitance circuit is greater than the time constant of this first resistance-capacitance circuit.
13. 1 kinds of fan motor brake gear control methods, the brake protection before starting to provide a fan motor, this control method comprises the following step:
A () provides a change-over circuit with multiple power switch component, wherein this change-over circuit is electrically connected this fan motor; And
(b) one external dc voltage turn-on one to brake enable circuit, to produce the plurality of power switch component of a brake control signal conducting, and then this fan motor is braked.
14., as the fan motor brake gear control method of claim 13, wherein, after step (b), also comprise:
C this brake enable circuit of () one brake relieving circuit forbidden energy, to stop this brake enable circuit to export this brake control signal, makes to end the plurality of power switch component, and then removes the brake of this fan motor; And
(d) one fan motor start-up circuit receive this external dc voltage, with start this fan motor running.
15. as the fan motor brake gear control method of claim 13, and wherein this brake enable circuit comprises a first brake activation power switch and one second and to brake activation power switch; Wherein this first brake activation power switch connects this second brake activation power switch; And this brake control signal is exported by this first brake activation power switch.
16. as the fan motor brake gear control method of claim 15, and wherein this brake relieving circuit comprises that power switch is removed in a brake, resistance is removed in a brake and electric capacity is removed in a brake; Wherein this brake is removed resistance and this brake and is removed electric capacity and form one first resistance-capacitance circuit, then removes power switch with this brake and be electrically connected.
17. as the fan motor brake gear control method of claim 16, and wherein this fan motor start-up circuit comprises one first starting power switch, one second starting power switch, a starting resistance and a start-up capacitance; Wherein this starting resistance and this start-up capacitance form one second resistance-capacitance circuit, then are electrically connected with this second starting power switch.
18. as the fan motor brake gear control method of claim 17, and wherein the time constant of this second resistance-capacitance circuit is greater than the time constant of this first resistance-capacitance circuit.
19. as the fan motor brake gear control method of claim 13, and wherein this fan motor brake gear also comprises:
One diode, is electrically connected between this change-over circuit and this fan motor start-up circuit, to guarantee that this external dc voltage is provided to this change-over circuit by this fan motor start-up circuit, to be converted to the electric power needed for this fan motor.
20. as the fan motor brake gear control method of claim 13, and wherein this fan motor is a three-phase dc motor or a single-phase DC motor, and this change-over circuit should be a three-phase circuit framework or a single phase circuit framework relatively.
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| CN104753404B (en) | 2018-01-30 |
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