CN1305214C - Rotating speed controlling circuit for brushless dc motor - Google Patents
Rotating speed controlling circuit for brushless dc motor Download PDFInfo
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- CN1305214C CN1305214C CNB031559425A CN03155942A CN1305214C CN 1305214 C CN1305214 C CN 1305214C CN B031559425 A CNB031559425 A CN B031559425A CN 03155942 A CN03155942 A CN 03155942A CN 1305214 C CN1305214 C CN 1305214C
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Abstract
The present invention relates to a rotary speed control circuit for a brushless DC motor, which comprises a fan motor driving circuit, an over current detecting and current limiting circuit and a multifunctional rotary speed control circuit, wherein the fan motor driving circuit is connected to the over current detecting and current limiting circuit which is connected to the multifunctional rotary speed control circuit. The over current detecting and current limiting circuit is used for detecting the rotary speed and the over current, and when the rotary speed is abnormal to generate over current, the over current detecting and current limiting circuit can control the fan motor driving circuit to maintain a low current standard position. The multifunctional rotary speed control circuit is used for controlling the over current detecting and current limiting circuit, and the rotary speed signal of the multifunctional rotary speed control circuit can control the over current detecting and current limiting circuit to control the rotary speed of a brushless DC motor.
Description
Technical field
The present invention relates to a kind of rotating-speed control circuit, refer in particular to a kind of like this rotating-speed control circuit of Brushless DC motor, it incorporates a rotating-speed control circuit into this Brushless DC motor, and this rotating-speed control circuit is connected to a current-limiting circuit, so that be applicable to the rotating speed control of Brushless DC motor.
Background technology
Please refer to shown in Figure 1ly, announce " the two-period form current-limiting circuit of brushless DC fan " No. 540902 in the Taiwan patent gazette of on May 23rd, 2003 bulletin, it discloses a fan motor drive circuit 10 and two-period form current-limiting circuit 20.
This fan motor drive circuit 10 comprises a Hall voltage amplifying circuit 11, a phasing back circuit 12 and a motor coil winding drive circuit 13.This Hall voltage amplifying circuit 11 exports this phasing back circuit 12 to again in order to amplify faint Hall voltage.The anti-turnback of amplification voltage-phase that 12 in this phasing back circuit will be imported exports this motor coil winding drive circuit 13 again to, so that make the motor coil winding replace excitatory driving rotor rotation.
This two-period form current-limiting circuit 20 comprises an overcurrent checking circuit 21, a running checking circuit 22 and a current-limiting circuit 23.Whether these overcurrent checking circuit 21 exportable voltage quasi positions for differentiating fan motor overcurrent take place.This running checking circuit 22 captures the voltage of these Hall voltage amplifying circuits 11, utilizes a rectification and integrating circuit to export a voltage quasi position (high or low accurate position) and whether running takes place unusually to differentiate fan motor.Whether 23 of this current-limiting circuits utilize the voltage quasi position decision current-limiting function of this overcurrent checking circuit 21 and running checking circuit 22 to start.The phasing back circuit 12 of controlling motor drive circuit 10 by this is limited in the low level that is not enough to destroy motor drive circuit with the electric current that suppresses the motor coil winding.This current-limiting circuit 23 has the voltage quasi position of a comparator in order to this overcurrent checking circuit 21 of computing and running checking circuit 22, determines whether current-limiting function starts again.
Please refer to shown in Figure 2ly, it is the pwm control circuit calcspar of known fan motor, and this fan motor 1 connects a pwm control circuit 30 and a temperature sensor 31, so that carry out the control of PWM rotating speed according to the temperature of this temperature sensor 31.Because this pwm control circuit 30 is connected to the drive circuit 10 of this fan motor 1 inside from external system (not illustrating), so this drive circuit 10 is subjected to duty-cycle (duty cycle) control that the pwm control circuit 30 of this external system is produced.
Fig. 3 discloses known utilization and is somebody's turn to do: pwm control circuit 30 controls and the rotating speed of adjustment fan motor 1 and the curve chart of temperature.This fan motor 1 has the control of multisection type rotating speed.It has rotating speed S0, S1, S2 at least under temperature T 0, T1, T2.
Shown in Fig. 2,3, when the detected temperatures of this temperature sensor 31 reached T1, this rotation speed of the fan was adjusted to S1.When the detected temperatures of this temperature sensor 31 reached S2, this rotation speed of the fan was adjusted to S2.Yet, because the required duty-cycle of the duty-cycle that the pwm control circuit 30 of this external system is produced and this drive circuit 10 is also inconsistent, so rotation speed of the fan can't accurately be controlled.Promptly when the detected temperatures of this temperature sensor 31 did not reach T1 or T2, this rotation speed of the fan can switch to S1 or S2 (please refer to shown in Figure 3) in advance.
Maybe when the detected temperatures of this temperature sensor 31 surpassed T1 and T2, rotation speed of the fan still can't switch to S1 or S2.
In brief, introduce PWM rotating speed controlling signal from external system and be not useful in Brushless DC motor with rotating speed control.
In view of this, the inventor develops the rotating-speed control circuit of Brushless DC motor of the present invention for improving the defective of above-mentioned known technology.
Summary of the invention
The main technical problem to be solved in the present invention is: the rotating-speed control circuit that a kind of Brushless DC motor is provided, one fan motor drive circuit is connected to an overcurrent detects current-limiting circuit, this overcurrent detects current-limiting circuit and is connected to a rotating-speed control circuit, the rotary speed signal of this rotating-speed control circuit of mat is controlled this overcurrent and is detected current-limiting circuit, makes the present invention have the effect of rotating speed control.
Another technical problem that the present invention will solve is: the rotating-speed control circuit that a kind of Brushless DC motor is provided, one fan motor drive circuit is connected an overcurrent detect a current-limiting circuit and a rotating-speed control circuit, and this rotating-speed control circuit is incorporated into to this Brushless DC motor, overall architecture with the rotating-speed control circuit of simplifying this Brushless DC motor makes the present invention have the effect of simplified construction.
Technical solution of the present invention is: a kind of rotating-speed control circuit of Brushless DC motor comprises:
One fan motor drive circuit, it connects a power supply:
One overcurrent detects current-limiting circuit, it is connected to this fan motor drive circuit, this overcurrent detects current-limiting circuit in order to the rotating speed that detects fan motor and detect its whether overcurrent, unusual and when producing overcurrent, this overcurrent detects this fan motor drive circuit of current-limiting circuit may command and maintains the accurate position of a low current when rotating speed: and
One rotating-speed control circuit, it is connected to this overcurrent and detects current-limiting circuit, and this rotating-speed control circuit produces the PWM signal and detects current-limiting circuit with output speed signal to this overcurrent, and this overcurrent detects the rotating speed that current-limiting circuit is controlled this Brushless DC motor.
The rotating-speed control circuit of aforesaid Brushless DC motor, described overcurrent detect current-limiting circuit and comprise an overcurrent checking circuit, a running checking circuit and a current-limiting circuit, and this current-limiting circuit connects this overcurrent checking circuit and running checking circuit.
The rotating-speed control circuit of aforesaid Brushless DC motor, described rotating-speed control circuit comprises a pwm control circuit and a temperature sensor, this pwm control circuit is connected to this temperature sensor, so that the temperature detection signal of this temperature sensor is imported this pwm control circuit.
The rotating-speed control circuit of aforesaid Brushless DC motor, described pwm control circuit is made up of a PwM generator and a control circuit, and this PWM generator is connected to this control circuit, and this PWM generator is connected to this overcurrent in addition and detects current-limiting circuit.
The rotating-speed control circuit of aforesaid Brushless DC motor, described control circuit be connected to this overcurrent of this temperature sensor detect current-limiting circuit comprise one the running checking circuit, this control circuit is connected to this running checking circuit in addition.
The rotating-speed control circuit of aforesaid Brushless DC motor, described temperature sensor belongs to a thermistor.
The rotating-speed control circuit of aforesaid Brushless DC motor, described rotating-speed control circuit connect this overcurrent and detect current-limiting circuit interior running checking circuit and current-limiting circuit.
The rotating-speed control circuit of aforesaid Brushless DC motor, described fan motor drive circuit comprises a Hall voltage amplifying circuit, a phasing back circuit and a motor coil winding drive circuit, and this phasing back circuit connects this Hall voltage amplifying circuit and motor coil winding drive circuit.
Characteristics of the present invention and advantage are: the rotating-speed control circuit of the Brushless DC motor that the present invention proposes, be a fan motor drive circuit to be connected an overcurrent detect current-limiting circuit, again a rotating-speed control circuit is connected to this overcurrent and detects current-limiting circuit, the rotary speed signal of this rotating-speed control circuit of mat is controlled this overcurrent and is detected current-limiting circuit, so that finish the multisection type rotating speed control of this fan motor drive circuit.Because this rotating-speed control circuit has the PWM generator, and the duty-cycle of the PWM signal that meets this Brushless DC motor can be provided, and so can accurately control the current limiting switch of this current-limiting circuit, and accurately control the phasing back circuit of this fan motor drive circuit; This rotating-speed control circuit is incorporated into to this Brushless DC motor, with the overall architecture of the rotating-speed control circuit of simplifying this Brushless DC motor.Thereby the rotating speed that has overcome known Brushless DC motor can't be according to the temperature that detects with accurate speed-changing, that is this known Brushless DC motor has too early speed-changing or postpones the defective of speed-changing, the rotating speed of Brushless DC motor of the present invention can be according to the accurate speed-changing of temperature that detects, be applicable to the rotating speed control of Brushless DC motor, and have the effect of simplified construction.
Description of drawings
Fig. 1 announces the calcspar of two-period form current-limiting circuit of No. 540902 brushless DC fan for the Taiwan patent gazette;
Fig. 2 is the calcspar of the pwm control circuit of known fan motor:
Fig. 3 is the rotating speed of known fan motor and the curve chart of temperature;
Fig. 4 is the calcspar of the rotating-speed control circuit of specific embodiment of the invention Brushless DC motor:
Fig. 5 is the schematic diagram of the rotating-speed control circuit of specific embodiment of the invention Brushless DC motor;
Fig. 6 is the rotating speed of specific embodiment of the invention Brushless DC motor and the curve chart of temperature.
Symbol description:
1, fan motor 10, fan motor drive circuit 11, Hall voltage amplifying circuit
111, hall sensing element 12, phasing back circuit 13, motor coil winding drive circuit
131, motor coil 20, overcurrent detect current-limiting circuit 21, overcurrent checking circuit
22, running checking circuit 30, PwM control circuit 41, pwm control circuit
42, temperature sensor 23, current-limiting circuit 31, temperature sensor
411, PWM generator 231, current limiting switch 40, rotating-speed control circuit
412, control circuit
Embodiment
In order to allow above and other objects of the present invention, feature and advantage understand by clearer and more definite quilt, following zhang will be especially exemplified by the specific embodiment of the invention, and cooperates appended graphicly, is described in detail below.
Fig. 4 discloses the process block diagram of the rotating-speed control circuit of specific embodiment of the invention Brushless DC motor; Fig. 5 discloses the circuit diagram of the rotating-speed control circuit of specific embodiment of the invention Brushless DC motor; Fig. 6 discloses the rotating speed of specific embodiment of the invention Brushless DC motor and the curve chart of temperature.
Please refer to shown in Figure 4ly, the specific embodiment of the invention is same as known part and adopts the same reference numbers group to indicate textural, be convenient to understand the specific embodiment of the invention and known between difference.The part technology contents of the specific embodiment of the invention has been disclosed in known description, incorporates reference in this, will not give unnecessary details in detail.
Please refer to shown in Figure 4ly, the rotating-speed control circuit of specific embodiment of the invention Brushless DC motor comprises a fan motor drive circuit 10, an overcurrent detects a current-limiting circuit 20 and a rotating-speed control circuit 40.This fan motor drive circuit 10 is connected to this overcurrent and detects current-limiting circuit 20, and this overcurrent detects current-limiting circuit 20 and is connected to this rotating-speed control circuit 40.Making this overcurrent detect current-limiting circuit 20 is serially connected with between this fan motor drive circuit 10 and the rotating-speed control circuit 40.
Referring again to shown in Figure 4, this fan motor drive circuit 10 is connected to a power supply (VCC), and it is in order to drive rotor rotation.This overcurrent detects current-limiting circuit 20 in order to detect this rotating speed of transferring to and whether to detect overcurrent, and when rotating speed took place to produce overcurrent unusually and simultaneously, this overcurrent detected current-limiting circuit 20 these fan motor drive circuits 10 of control and maintains the accurate position of a low current.This rotating-speed control circuit 40 detects current-limiting circuit 20 in order to control this overcurrent, and this rotating-speed control circuit 40 is controlled this overcurrent with rotary speed signal and detected current-limiting circuit 20, so that finish the rotating speed control of this fan motor drive circuit 10.
Please refer to shown in Fig. 4,5, this fan motor drive circuit 10 comprises a Hall voltage amplifying circuit 11, a phasing back circuit 12 and a motor coil winding drive circuit 13, and this phasing back circuit 12 connects this Hall voltage amplifying circuit 11 and motor coil winding drive circuit 13.This Hall voltage amplifying circuit 11 is connected to a hall sensing element 111, so that the Hall signal of this hall sensing element 111 is amplified, exports this phasing back circuit 12 again to.The anti-turnback of amplification voltage-phase that 12 in this phasing back circuit will be imported exports this motor coil winding drive circuit 13 again to.This motor coil winding drive circuit 13 connects a motor coil 131.It is alternately excitatory that the output of this phasing back circuit 12 of mat drives this motor coil 131, so that drive the rotor rotation.
Shown in Fig. 4,5, this overcurrent detects current-limiting circuit 20 and comprises an overcurrent checking circuit 21, a running checking circuit 22 and a current-limiting circuit 23.
Shown in Fig. 4,5, this overcurrent checking circuit 21 is serially connected between this motor coil winding drive circuit 13 and the current-limiting circuit 23.Referring again to shown in Figure 5, this overcurrent checking circuit 21 preferably belongs to a resistance, and it is exported a voltage quasi position and for these current-limiting circuit 23 these motor coil winding drive circuit 13 of differentiation whether overcurrent takes place.
Shown in Fig. 4,5, this running checking circuit 22 is serially connected between this Hall voltage amplifying circuit 11 and the current-limiting circuit 23.This running checking circuit 22 captures the voltage of these Hall voltage amplifying circuits 11, utilizes a rectification and integrating circuit to export a voltage quasi position (high or low accurate position) and whether running takes place unusually for these current-limiting circuit 23 differentiation fan motors.
Shown in Fig. 4,5, this current-limiting circuit 23 comprises a current limiting switch 231, and it is connected to this phasing back circuit 12, and this current-limiting circuit 23 connects this overcurrent checking circuit 21 and running checking circuit 22.Whether this current-limiting circuit utilizes the voltage quasi position decision current-limiting function of this overcurrent checking circuit 21 and running checking circuit 22 to start, and the phasing back circuit 12 of controlling motor drive circuit 10 by this is limited in the low level that is not enough to destroy fan motor drive circuit 10 with the electric current that suppresses motor coil winding 131.This current-limiting circuit 23 has the voltage quasi position of a comparator in order to this overcurrent checking circuit 21 of computing and running checking circuit 22, and the output of this comparator exports this phasing back circuit 12 to via this current limiting switch 231, so that carry out Current limited Control.
Referring again to shown in Figure 4, this rotating-speed control circuit 40 is connected in fan motor drive circuit 10 via overcurrent checking circuit 20, and this rotating-speed control circuit 40 can be incorporated in this Brushless DC motor,
Make this Brushless DC motor itself have PWM control.And this rotating-speed control circuit 40 comprises a pwm control circuit 41 and a temperature sensor 42.This pwm control circuit 41 is made up of a PwM generator 411 and a control circuit 412.This rotating-speed control circuit 40 connects this running checking circuit 22 and current-limiting circuit 23, detects signal so that obtain rotating speed.This control circuit 412 is connected to this temperature sensor 42 in addition, so that obtain the temperature detection signal.This PWM generator 411 is connected between this current-limiting circuit 23 and the control circuit 412, and this PWM generator 411 is in order to producing the PWM signal, and inputs to this current-limiting circuit 23, to control this fan motor drive circuit 10.412 of this control circuits connect this running checking circuit 22 and temperature sensor 42.
Referring again to shown in Figure 5, the PWM generator 411 and the control circuit 412 of this pwm control circuit 41 can be made into single wafer.
Referring again to shown in Figure 5, this temperature sensor 42 belongs to a thermistor, and it is in order to detected temperatures, so that the temperature detection signal is imported the control circuit 412 of this pwm control circuit 41.
Referring again to shown in Figure 4, because this rotating-speed control circuit 40 has this PWM generator 411, therefore can provide the duty-cycle of the PWM signal that meets this Brushless DC motor, so can accurately control the current limiting switch 231 of this current-limiting circuit 23, as shown in Figure 5.Therefore this rotating-speed control circuit 40 can accurately be controlled the phasing back circuit 12 of this fan motor drive circuit 10 via this current limiting switch 231.
Please refer to shown in Figure 6ly, under 40 controls of this rotating-speed control circuit, when these temperature sensor 42 detected temperatures were T0, T1, T2, T3, the rotating speed that this rotating-speed control circuit 40 can accurately be controlled this Brushless DC motor was S0, S1, S2, S3.For example, when temperature rose to T1, the rotating speed of this Brushless DC motor increased to S1 from the S0 switching immediately.Same, when temperature dropped to T0, the commentaries on classics of this Brushless DC motor was moved back to switch from S1 immediately and is reduced to S0.
To shown in Figure 6, the temperature that the rotating speed of known Brushless DC motor can't be complied with detection is with accurate speed-changing, that is this known Brushless DC motor has too early speed-changing or postpones the defective of speed-changing referring again to Fig. 1.Relative, the rotating speed of Brushless DC motor of the present invention but can make rotating-speed control circuit 40 of the present invention be applicable to the rotating speed control of Brushless DC motor according to the accurate speed-changing of temperature that detects.
Though the present invention discloses with specific embodiment; but it is not in order to limit the present invention; any those skilled in the art; the displacement of the equivalent assemblies of under the prerequisite that does not break away from design of the present invention and scope, having done; or, all should still belong to the category that this patent is contained according to equivalent variations and modification that scope of patent protection of the present invention is done.
Claims (8)
1, a kind of rotating-speed control circuit of Brushless DC motor is characterized in that: described rotating-speed control circuit comprises:
One fan motor drive circuit, it connects a power supply;
One overcurrent detects current-limiting circuit, it is connected to this fan motor drive circuit, this overcurrent detects current-limiting circuit in order to the rotating speed that detects fan motor and detect its whether overcurrent, unusual and when producing overcurrent when rotating speed, this overcurrent detects current-limiting circuit and controls this fan motor drive circuit and maintain the accurate position of a low current; And
One rotating-speed control circuit, it is connected to this overcurrent and detects current-limiting circuit, and this rotating-speed control circuit produces the PWM signal and detects current-limiting circuit with output speed signal to this overcurrent, and this overcurrent detects the rotating speed that current-limiting circuit is controlled this Brushless DC motor.
2, the rotating-speed control circuit of Brushless DC motor as claimed in claim 1, it is characterized in that: described overcurrent detects current-limiting circuit and comprises an overcurrent checking circuit, a running checking circuit and a current-limiting circuit, and this current-limiting circuit connects this overcurrent checking circuit and running checking circuit.
3, the rotating-speed control circuit of Brushless DC motor as claimed in claim 1, it is characterized in that: described rotating-speed control circuit comprises a pwm control circuit and a temperature sensor, this pwm control circuit is connected to this temperature sensor, so that the temperature detection signal of this temperature sensor is imported this pwm control circuit.
4, the rotating-speed control circuit of Brushless DC motor as claimed in claim 3, it is characterized in that: described pwm control circuit is made up of a PWM generator and a control circuit, this PWM generator is connected to this control circuit, and this PWM generator is connected to this overcurrent in addition and detects current-limiting circuit.
5, the rotating-speed control circuit of Brushless DC motor as claimed in claim 4, it is characterized in that: described control circuit is connected to this temperature sensor, this overcurrent detects current-limiting circuit and comprises a running checking circuit, and this control circuit is connected to this running checking circuit in addition.
6, the rotating-speed control circuit of Brushless DC motor as claimed in claim 3 is characterized in that: described temperature sensor belongs to a thermistor.
7, the rotating-speed control circuit of Brushless DC motor as claimed in claim 2 is characterized in that: described rotating-speed control circuit connects this overcurrent and detects current-limiting circuit interior running checking circuit and current-limiting circuit.
8, the rotating-speed control circuit of Brushless DC motor as claimed in claim 1, it is characterized in that: described fan motor drive circuit comprises a Hall voltage amplifying circuit, a phasing back circuit and a motor coil winding drive circuit, and this phasing back circuit connects this Hall voltage amplifying circuit and motor coil winding drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031559425A CN1305214C (en) | 2003-08-27 | 2003-08-27 | Rotating speed controlling circuit for brushless dc motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031559425A CN1305214C (en) | 2003-08-27 | 2003-08-27 | Rotating speed controlling circuit for brushless dc motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1592079A CN1592079A (en) | 2005-03-09 |
| CN1305214C true CN1305214C (en) | 2007-03-14 |
Family
ID=34598256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031559425A Expired - Fee Related CN1305214C (en) | 2003-08-27 | 2003-08-27 | Rotating speed controlling circuit for brushless dc motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1305214C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100428101C (en) * | 2006-08-07 | 2008-10-22 | 贵州大学 | Radiating method of using circuit structure to complement heat conduction |
| US7911168B2 (en) * | 2007-02-27 | 2011-03-22 | Ricoh Company, Limited | Method and device for controlling motor, and image forming apparatus |
| CN103807193B (en) * | 2012-11-06 | 2016-08-17 | 台达电子工业股份有限公司 | Signal generating circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1223029A (en) * | 1996-05-02 | 1999-07-14 | 西门子加拿大有限公司 | Control circuit for five-phase brushless DC motor |
| JP2003003990A (en) * | 2001-06-25 | 2003-01-08 | Minebea Co Ltd | Speed controller for brushless direct current fan motor |
-
2003
- 2003-08-27 CN CNB031559425A patent/CN1305214C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1223029A (en) * | 1996-05-02 | 1999-07-14 | 西门子加拿大有限公司 | Control circuit for five-phase brushless DC motor |
| JP2003003990A (en) * | 2001-06-25 | 2003-01-08 | Minebea Co Ltd | Speed controller for brushless direct current fan motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1592079A (en) | 2005-03-09 |
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Granted publication date: 20070314 Termination date: 20120827 |