CN104410335A - Control circuit and control method of intelligent small-power motor controller - Google Patents
Control circuit and control method of intelligent small-power motor controller Download PDFInfo
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- CN104410335A CN104410335A CN201410668544.5A CN201410668544A CN104410335A CN 104410335 A CN104410335 A CN 104410335A CN 201410668544 A CN201410668544 A CN 201410668544A CN 104410335 A CN104410335 A CN 104410335A
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Abstract
The invention relates to the technical field of motors, particularly to a control circuit and a control method of an intelligent small-power motor controller. The control circuit of the intelligent small-power motor controller comprises a direct current brushless motor driving circuit, a direct current brush motor driving circuit, an MCU (Microprogrammed Control Unit) single chip microcomputer connected with the direct current brushless motor driving circuit and the direct current brush motor driving circuit, and a detection circuit and a power circuit connected with the MCU single chip microcomputer. The direct current brushless motor driving circuit and the direct current brush motor driving circuit are integrally controlled by the MCU single chip microcomputer, and the MCU single chip microcomputer adjusts pulse modulation signals input into the two driving circuits according to temperature signals fed back by the detection circuit to further control the rotating speed of a direct current brushless motor and a direct current brush motor. According to the control circuit and the control method of the intelligent small-power motor controller, the direct current brushless motor and the direct current brush motor are controlled through one control module simultaneously, thus the control process is simpler, the direct current brushless motor and the direct current brush motor respectively automatically adjust motor rotating speeds of an electric water pump and a condensation fan according to water temperature, and thus sources are effectively reduced and noises are also reduced.
Description
Technical field
The present invention relates to technical field of motors, particularly a kind of control circuit of intelligent small power electric machine controller and control method.
Background technology
DC electromotor with brush is widely used in motion control field with its excellent torque characteristics, but common DC electromotor with brush is due to the mechanical commutation of needs and brush, and poor reliability needs often to safeguard; Produce electromagnetic interference during commutation, noise is large, have impact on DC electromotor with brush further application in the controls.In order to overcome the shortcoming that mechanical commutation brings, the DC Brushless Motor replacing mechanical commutation with electronics commutation is arisen at the historic moment.30 for many years, and along with the development of permanent magnetism new material, microelectric technique, automatic control technology and power electronic technology particularly high-power switch device, DC Brushless Motor is widely applied.
According to IMSResearch (electron trade research institution) current research report, between 2012 to 2017 years, the non-brush permanent-magnet DC motor shipment amount being applied to automobile industry will exceed brush direct current motor and stepping motor, non-brush permanent-magnet DC motor shipment amount will rise 52%, and selling will more than 4.62 hundred million.Non-brush permanent-magnet DC motor is widely used in drive system and chassis application in automobile, and as electronic-controlled power steering, transmission driving and engine-cooling system, brush direct current motor is mainly used in door lock, power windows etc.
Although DC brushless motor has, structure is simple, volume is little and low cost and other advantages, and after adding upper position sensor, volume becomes large, and cost increases, and installation accuracy requires high.In order to reduce the cost of control system, volume and assembly complexity, position-sensor-free technology based on back-EMF determination is operated and gives birth to, in various method for controlling position-less sensor, back electromotive force method is the most ripe, the most widely used rotor position detecting method of current technology.Back electromotive force method advantage is that amount of calculation is little, is easy to realize.Shortcoming is exactly difficulty in starting, needs according to motor characteristic, well-designed initiation culture, rotor fixed position excitatory time and angle of lead.In addition, in conventional truck, brush direct current motor or DC brushless motor separately control, control procedure bothers, and adopts relay to control due to the condenser fan of conventional truck, can not adjusting rotary speed as required, cause unnecessary energy waste, and there is larger noise.
Summary of the invention
The object of the present invention is to provide a kind of control circuit and control method of intelligent small power electric machine controller, DC brushless motor and brush direct current motor adopt a control module to control by it simultaneously, control procedure is more simple, automatically regulate the motor speed of electric water pump and condenser fan with DC brushless motor and brush direct current motor respectively according to water temperature, effectively save the energy.
For the control circuit of a kind of intelligent small power electric machine controller of the present invention, its technical scheme is:
Comprise Brushless DC Motor Drive Circuit, for driving electric water pump;
Brush direct current motor drive circuit, for driving condenser fan;
The MCU single-chip microcomputer be connected with Brushless DC Motor Drive Circuit and brush direct current motor drive circuit, for controlling Brushless DC Motor Drive Circuit and brush direct current motor drive circuit;
The testing circuit be connected with MCU single-chip microcomputer, for detecting the water temperature of condenser fan and electric water pump and feeding back to MCU single-chip microcomputer.
Power circuit, for providing electric energy for MCU single-chip microcomputer, Brushless DC Motor Drive Circuit and brush direct current motor drive circuit;
Further, the three phase full bridge drive circuit that described Brushless DC Motor Drive Circuit comprises brushless electric machine drive IC and is attached thereto.
Further, the power driving circuit that described brush direct current motor drive circuit comprises brush motor predrive circuit and is attached thereto.
Further, described brushless electric machine drive IC is connected with initiation culture selection circuit, for controlling the initiation culture of DC brushless motor.
For the control method of a kind of intelligent small power electric machine controller of the present invention, its technical scheme is: described Brushless DC Motor Drive Circuit and the MCU single-chip microcomputer centralized control of brush direct current motor drive circuit by being attached thereto, the temperature signal that described MCU single-chip microcomputer feeds back according to testing circuit regulates the pulse-modulated signal being input to Brushless DC Motor Drive Circuit and brush direct current motor drive circuit, thus controls the rotating speed of DC brushless motor and brush direct current motor.
Further, described MCU single-chip microcomputer to the control mode of Brushless DC Motor Drive Circuit is:
Export the first pulse-modulated signal PWM1 to the brushless electric machine drive IC of Brushless DC Motor Drive Circuit, for controlling the rotating speed of DC brushless motor.
Export steering controling signal to the brushless electric machine drive IC of Brushless DC Motor Drive Circuit, for controlling turning to of DC brushless motor.
Export angle of lead control signal to the brushless electric machine drive IC of Brushless DC Motor Drive Circuit, for controlling the angle of lead of DC brushless motor.
Further, when described MCU single-chip microcomputer is high level to the turn signal that the brushless electric machine drive IC of Brushless DC Motor Drive Circuit exports, DC brushless motor rotates forward;
When MCU single-chip microcomputer is low level to the turn signal that the brushless electric machine drive IC of Brushless DC Motor Drive Circuit exports, DC brushless motor reverses.
Further, to the angle of lead control signal that the brushless electric machine drive IC of Brushless DC Motor Drive Circuit exports, described MCU single-chip microcomputer is that high level, mid point are flat, low level time, DC brushless motor exports different leading angles.
Further, described MCU single-chip microcomputer inputs the second pulse-modulated signal PWM2 to the brush motor predrive circuit of brush direct current motor drive circuit, controls the rotating speed of brush direct current motor.
Further, described MCU single-chip microcomputer regulates the duty ratio of the first pulse-modulated signal PWM1 by the electric water pump water temperature that testing circuit feeds back, and in the process that electric water pump water temperature heats up gradually, its regulative mode is as follows:
When water temperature is lower than predetermined value 1, MCU Single-chip Controlling electric water pump gap operates;
When water temperature is between predetermined value 1 and predetermined value 2, the duty ratio of the first pulse-modulated signal PWM1 is 35% ~ 45%;
When water temperature is between predetermined value 2 to predetermined value 3, the duty ratio of the first pulse-modulated signal PWM1 is 45% ~ 55%;
When water temperature is higher than predetermined value 3, the duty ratio of the first pulse-modulated signal PWM1 is 55% ~ 70%;
Further, described MCU single-chip microcomputer regulates the duty ratio of the first pulse-modulated signal PWM1 by the electric water pump water temperature that testing circuit feeds back, and in the process that electric water pump water temperature reduces gradually, its regulative mode is as follows:
When water temperature is higher than predetermined value 4, the duty ratio of the first pulse-modulated signal PWM1 is 55% ~ 70%;
When water temperature is between predetermined value 4 to predetermined value 5, the duty ratio of the first pulse-modulated signal PWM1 is 45% ~ 55%;
When water temperature is between predetermined value 5 to predetermined value 6, the duty ratio of the first pulse-modulated signal PWM1 is 35% ~ 45%;
When water temperature is lower than predetermined value 6, MCU Single-chip Controlling electric water pump gap operates.
Further, described MCU single-chip microcomputer controls the duty ratio of the second pulse-modulated signal PWM2 by the condenser fan water temperature that testing circuit feeds back, and in the process that condenser fan water temperature heats up gradually, its control mode is as follows:
When water temperature is lower than predetermined value 7, condenser fan shuts down;
When water temperature is between predetermined value 7 to predetermined value 8, the duty ratio of the second pulse-modulated signal PWM2 is 45% ~ 55%;
When water temperature is higher than predetermined value 8, the duty ratio of the second pulse-modulated signal PWM2 is 100%;
Further, described MCU single-chip microcomputer controls the duty ratio of the second pulse-modulated signal PWM2 by the condenser fan water temperature that testing circuit feeds back, and in the process that condenser fan water temperature reduces gradually, its control mode is as follows:
When water temperature is higher than predetermined value 9, the duty ratio of the second pulse-modulated signal PWM2 is 100%;
When water temperature is between predetermined value 9 to predetermined value 10, the duty ratio of the second pulse-modulated signal PWM2 is 45% ~ 55%.
When water temperature is lower than predetermined value 10, condenser fan shuts down.
The invention has the beneficial effects as follows: the present invention adopts MCU single-chip microcomputer to control DC brushless motor and brush direct current motor simultaneously, and control mode is simpler.Adopt back electromotive force technology to replace position transducer, save space.Different pulse-modulated signals is exported by MCU single-chip microcomputer; the moment of torsion of DC brushless motor and brush direct current motor is controlled respectively according to the water temperature of electric water pump and condenser fan; there is higher intelligent and flexibility; while protection electric water pump and condenser fan motor, effectively avoiding unnecessary energy waste by reducing rotating speed, and reducing noise.Brushless electric machine drive IC connecting initiation culture selection circuit, without the need to designing the initiation culture of motor, only needing the initiation culture different according to the selection of Motor of different size, easy to use.And brushless electric machine drive IC has overcurrent protection, short-circuit protection, chip overheating protection and the protection of chip over-and under-voltage simultaneously, ensure that the normal operation of DC brushless motor.The inline diagnosis function of controller can be realized by CAN transmission circuit, have higher intelligent.
Accompanying drawing explanation
Fig. 1 is model calling block diagram of the present invention;
Fig. 2 is Brushless DC Motor Drive Circuit theory diagram;
Fig. 3 is brush direct current motor driving circuit principle block diagram;
Fig. 4 is electric water pump control strategy figure;
Fig. 5 is condenser fan control strategy figure;
In figure: 1-MCU single-chip microcomputer, 2-Brushless DC Motor Drive Circuit, 3-brush direct current motor drive circuit, 4-power circuit, 5-testing circuit, 6-DC brushless motor, 7-brush direct current motor, 8-CAN transmission circuit, 9-brushless electric machine drive IC, 10-three phase full bridge drive circuit, 11-brush motor predrive circuit, 12-power driving circuit.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
As shown in Figure 1, the present invention includes MCU single-chip microcomputer 1, the Brushless DC Motor Drive Circuit 2 be connected with MCU single-chip microcomputer 1, brush direct current motor drive circuit 3, testing circuit 5 and CAN transmission circuit 8, and power circuit 4.Described power circuit 4 produces VDD (12V filtering output) and is supplied to Brushless DC Motor Drive Circuit 2, produce VCC (5V voltage stabilizing output) and be supplied to MCU single-chip microcomputer 1 and CAN transmission circuit 8, input 12V power supply is to the winding of brush direct current motor 7.CAN transmission circuit 8 for realizing the communication of MCU single-chip microcomputer 1 and CAN network, thus realizes the inline diagnosis function of controller.Testing circuit 5 is the interface circuits between external circuit and MCU single-chip microcomputer 1, external switch signal, temperature signal and voltage signal are converted to the input signal that MCU single-chip microcomputer 1 can receive, and the pulse-modulated signal that single-chip microcomputer is exported and digital signal convert the control inputs signal of external equipment to.
The DC brushless motor 6 be connected with Brushless DC Motor Drive Circuit 2 drives electric water pump work, the three phase full bridge drive circuit 10 that it comprises brushless electric machine drive IC 9 and is attached thereto, and three phase full bridge drive circuit 10 connects brush DC drive motors 6.During work, testing circuit 5 detects the temperature of electric water pump water, and this temperature information is fed back to MCU single-chip microcomputer 1, MCU single-chip microcomputer according to the first pulse-modulated signal PWM1 duty ratio of temperature information control inputs to brushless electric machine drive IC 9, thus control the output torque of DC brushless motor 6.First pulse-modulated signal PWM1 duty ratio is directly proportional to the output torque of DC brushless motor 6.MCU single-chip microcomputer 1 inputs the first pulse-modulated signal PWM1 by the PWM_INPUT pin be connected with brushless electric machine drive IC 9 to Brushless DC Motor Drive Circuit 2, and exports three-phase windings drive pulse signal by three phase full bridge drive circuit 10; By OUTFG pin by speed feedback signal to MCU single-chip microcomputer 1; By the CW_CCW pin that is connected with brushless electric machine drive IC 9 to Brushless DC Motor Drive Circuit 2 input redirect control signal, for controlling turning to of DC brushless motor 6; By the SLA pin be connected with brushless electric machine drive IC 9, angle of lead control signal is inputted to Brushless DC Motor Drive Circuit 2, for controlling the angle of lead of DC brushless motor.
The control procedure of MCU single-chip microcomputer 1 pair of Brushless DC Motor Drive Circuit 2 is as follows: when the turn signal that MCU single-chip microcomputer 1 pair of brushless electric machine drive IC exports is high level, DC brushless motor rotates forward, and during for low level, DC brushless motor rotates forward.When the angle of lead control signal that MCU single-chip microcomputer 1 pair of brushless electric machine drive IC exports is high level, the leading angle of DC brushless motor 6 is 7.5 °, when angle of lead control signal is low level, the leading angle of DC brushless motor is 15 °, when angle of lead control signal is middle level (namely opening a way), the leading angle of DC brushless motor is 30 °.The angle of angle of lead of the present invention can sets itself according to the model specification of motor and applicable situation.
Brushless electric machine drive IC 9 is also connected with an initiation culture selection circuit, for controlling the initiation culture of DC brushless motor.When the generator of different size uses, only need to select suitable initiation culture.Brushless electric machine drive IC 9 detects size of current by the I-detect pin be connected with three phase full bridge drive circuit 10; realize overcurrent and the short-circuit protection of chip; the VD input of brushless electric machine drive IC 9 then can carry out overvoltage protection to chip; when overtension, directly cut off the power supply to brushless electric machine drive IC 9.And brushless electric machine drive IC 9 inside carries temperature sensor functionality, realize the overtemperature protection of chip self.
As shown in Figure 3, brush direct current motor drive circuit 3 comprises brush motor predrive circuit 11 and the power driving circuit 12 be attached thereto.MCU single-chip microcomputer 1 pair of brush motor predrive circuit 11 inputs the second pulse-modulated signal PWM2, and brush motor drive circuit 12 output motor winding current signal, the size of winding current is directly proportional to the moment of torsion of brush direct current motor 7.
Be illustrated in figure 4 the control strategy figure of electric water pump; the water temperature of electric water pump feeds back to MCU single-chip microcomputer 1 by testing circuit 5; the first pulse-modulated signal PWM1 duty ratio that MCU single-chip microcomputer 1 exports according to lower water temperature, thus regulate motor speed, reach energy-conservation and the effect of protection motor.Concrete control mode is as follows:
In the process of electric water pump water temperature up stroke (namely water temperature rises gradually):
When water temperature is lower than predetermined value 1, MCU Single-chip Controlling electric water pump gap operates;
When water temperature is between predetermined value 1 and predetermined value 2, the duty ratio of the first pulse-modulated signal PWM1 is 35% ~ 45%, and the present embodiment gets 40%.
When water temperature is between predetermined value 2 to predetermined value 3, the duty ratio of the first pulse-modulated signal PWM1 is 45% ~ 55%, and the present embodiment gets 50%.
When water temperature is higher than predetermined value 3, the duty ratio of the first pulse-modulated signal PWM1 is 55% ~ 70%, and the present embodiment gets 65%.
In the process of electric water pump water temperature down stroke (namely water temperature reduces gradually):
When water temperature is higher than predetermined value 4, the duty ratio of the first pulse-modulated signal PWM1 is 55% ~ 70%, and the present embodiment gets 65%.
When water temperature is between predetermined value 4 to predetermined value 5, the duty ratio of the first pulse-modulated signal PWM1 is 45% ~ 55%, and the present embodiment gets 50%.
When water temperature is between predetermined value 5 to predetermined value 6, the duty ratio of the first pulse-modulated signal PWM1 is 35% ~ 45%, and the present embodiment gets 40%.
When water temperature is lower than predetermined value 6, MCU Single-chip Controlling electric water pump gap operates.
Be illustrated in figure 5 the control strategy figure of condenser fan, MCU single-chip microcomputer 1 controls the duty ratio of the second pulse-modulated signal PWM2 by the condenser fan water temperature that * * circuit 5 feeds back, and its concrete control mode is as follows:
In the process of condenser fan water temperature up stroke (namely water temperature heats up gradually):
When water temperature is lower than predetermined value 7, condenser fan shuts down;
When water temperature is between predetermined value 7 to predetermined value 8, the duty ratio of the second pulse-modulated signal PWM2 is 45% ~ 55%, and the present embodiment gets 50%.
When water temperature is higher than predetermined value 8, the duty ratio of the second pulse-modulated signal PWM2 is 100%;
In the process of condenser fan water temperature down stroke (namely water temperature reduces gradually):
When water temperature is higher than predetermined value 9, the duty ratio of the second pulse-modulated signal PWM2 is 100%;
When water temperature is between predetermined value 9 to predetermined value 10, the duty ratio of the second pulse-modulated signal PWM2 is 45% ~ 55%, and the present embodiment gets 50%.
When water temperature is lower than predetermined value 10, condenser fan shuts down.
Predetermined value 1 ~ 10 can according to the motor of different size and different use occasion sets itself, in embodiment provided by the present invention, predetermined value 1 gets 37 °, predetermined value 2 gets 43 °, and predetermined value 3 gets 50 °, and predetermined value 4 gets 47 °, predetermined value 5 gets 40 °, predetermined value 6 gets 35 °, and predetermined value 7 gets 57 °, and predetermined value 8 gets 65 °, predetermined value 9 gets 61 °, and predetermined value 10 gets 53 °.
The above, be only the specific embodiment of the present invention, it should be pointed out that any those of ordinary skill in the art are in the technical scope disclosed by the present invention, the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (13)
1. a control circuit for intelligent small power electric machine controller, is characterized in that: comprise Brushless DC Motor Drive Circuit, for driving electric water pump;
Brush direct current motor drive circuit, for driving condenser fan;
The MCU single-chip microcomputer be connected with Brushless DC Motor Drive Circuit and brush direct current motor drive circuit, for controlling Brushless DC Motor Drive Circuit and brush direct current motor drive circuit;
The testing circuit be connected with MCU single-chip microcomputer, for detecting the water temperature of condenser fan and electric water pump and feeding back to MCU single-chip microcomputer.
Power circuit, for providing electric energy for MCU single-chip microcomputer, Brushless DC Motor Drive Circuit and brush direct current motor drive circuit.
2. a kind of intelligent small power electric machine controller as claimed in claim 1, is characterized in that: the three phase full bridge drive circuit that described Brushless DC Motor Drive Circuit comprises brushless electric machine drive IC and is attached thereto.
3. a kind of intelligent small power electric machine controller as claimed in claim 1, is characterized in that: the power driving circuit that described brush direct current motor drive circuit comprises brush motor predrive circuit and is attached thereto.
4. a kind of intelligent small power electric machine controller as claimed in claim 2, is characterized in that: described brushless electric machine drive IC is connected with initiation culture selection circuit, for controlling the initiation culture of DC brushless motor.
5. the control method of a kind of intelligent low-power machine controller controling circuit as claimed in claim 1, it is characterized in that: described Brushless DC Motor Drive Circuit and the MCU single-chip microcomputer centralized control of brush direct current motor drive circuit by being attached thereto, the temperature signal that described MCU single-chip microcomputer feeds back according to testing circuit regulates the pulse-modulated signal being input to Brushless DC Motor Drive Circuit and brush direct current motor drive circuit, thus controls the rotating speed of DC brushless motor and brush direct current motor.
6. the control method of a kind of intelligent low-power machine controller controling circuit as claimed in claim 5, is characterized in that: described MCU single-chip microcomputer to the control mode of Brushless DC Motor Drive Circuit is:
Export the first pulse-modulated signal PWM1 to the brushless electric machine drive IC of Brushless DC Motor Drive Circuit, for controlling the rotating speed of DC brushless motor.
Export steering controling signal to the brushless electric machine drive IC of Brushless DC Motor Drive Circuit, for controlling turning to of DC brushless motor.
Export angle of lead control signal to the brushless electric machine drive IC of Brushless DC Motor Drive Circuit, for controlling the angle of lead of DC brushless motor.
7. the control method of a kind of intelligent low-power machine controller controling circuit as claimed in claim 6, it is characterized in that: when described MCU single-chip microcomputer is high level to the turn signal that the brushless electric machine drive IC of Brushless DC Motor Drive Circuit exports, DC brushless motor rotates forward;
When MCU single-chip microcomputer is low level to the turn signal that the brushless electric machine drive IC of Brushless DC Motor Drive Circuit exports, DC brushless motor reverses.
8. the control method of a kind of intelligent low-power machine controller controling circuit as claimed in claim 6, it is characterized in that: to the angle of lead control signal that the brushless electric machine drive IC of Brushless DC Motor Drive Circuit exports, described MCU single-chip microcomputer is that high level, mid point are flat, low level time, DC brushless motor exports different leading angles.
9. the control method of a kind of intelligent low-power machine controller controling circuit as claimed in claim 5, it is characterized in that: described MCU single-chip microcomputer inputs the second pulse-modulated signal PWM2 to the brush motor predrive circuit of brush direct current motor drive circuit, control the rotating speed of brush direct current motor.
10. the control method of a kind of intelligent low-power machine controller controling circuit as claimed in claim 6, it is characterized in that: described MCU single-chip microcomputer regulates the duty ratio of the first pulse-modulated signal PWM1 by the electric water pump water temperature that testing circuit feeds back, in the process that electric water pump water temperature heats up gradually, its regulative mode is as follows:
When water temperature is lower than predetermined value 1, MCU Single-chip Controlling electric water pump gap operates;
When water temperature is between predetermined value 1 and predetermined value 2, the duty ratio of the first pulse-modulated signal PWM1 is 35% ~ 45%;
When water temperature is between predetermined value 2 to predetermined value 3, the duty ratio of the first pulse-modulated signal PWM1 is 45% ~ 55%;
When water temperature is higher than predetermined value 3, the duty ratio of the first pulse-modulated signal PWM1 is 55% ~ 70%.
The control method of 11. a kind of intelligent low-power machine controller controling circuits as claimed in claim 6, it is characterized in that: described MCU single-chip microcomputer regulates the duty ratio of the first pulse-modulated signal PWM1 by the electric water pump water temperature that testing circuit feeds back, in the process that electric water pump water temperature reduces gradually, its regulative mode is as follows:
When water temperature is higher than predetermined value 4, the duty ratio of the first pulse-modulated signal PWM1 is 55% ~ 70%;
When water temperature is between predetermined value 4 to predetermined value 5, the duty ratio of the first pulse-modulated signal PWM1 is 45% ~ 55%;
When water temperature is between predetermined value 5 to predetermined value 6, the duty ratio of the first pulse-modulated signal PWM1 is 35% ~ 45%;
When water temperature is lower than predetermined value 6, MCU Single-chip Controlling electric water pump gap operates.
The control method of 12. a kind of intelligent low-power machine controller controling circuits as claimed in claim 5, it is characterized in that: described MCU single-chip microcomputer controls the duty ratio of the second pulse-modulated signal PWM2 by the condenser fan water temperature that testing circuit feeds back, in the process that condenser fan water temperature heats up gradually, its control mode is as follows:
When water temperature is lower than predetermined value 7, condenser fan shuts down;
When water temperature is between predetermined value 7 to predetermined value 8, the duty ratio of the second pulse-modulated signal PWM2 is 45% ~ 55%;
When water temperature is higher than predetermined value 8, the duty ratio of the second pulse-modulated signal PWM2 is 100%.
The control method of 13. a kind of intelligent low-power machine controller controling circuits as claimed in claim 5, it is characterized in that: described MCU single-chip microcomputer controls the duty ratio of the second pulse-modulated signal PWM2 by the condenser fan water temperature that testing circuit feeds back, in the process that condenser fan water temperature reduces gradually, its control mode is as follows:
When water temperature is higher than predetermined value 9, the duty ratio of the second pulse-modulated signal PWM2 is 100%;
When water temperature is between predetermined value 9 to predetermined value 10, the duty ratio of the second pulse-modulated signal PWM2 is 45% ~ 55%.
When water temperature is lower than predetermined value 10, condenser fan shuts down.
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| CN104410335B (en) | 2018-01-30 |
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