CN1260422C - System for automatic detecting and controlling power supply frequency and method applied to waching machine - Google Patents
System for automatic detecting and controlling power supply frequency and method applied to waching machine Download PDFInfo
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- CN1260422C CN1260422C CNB021346356A CN02134635A CN1260422C CN 1260422 C CN1260422 C CN 1260422C CN B021346356 A CNB021346356 A CN B021346356A CN 02134635 A CN02134635 A CN 02134635A CN 1260422 C CN1260422 C CN 1260422C
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Abstract
The present invention relates to a system and a method for automatically detecting and controlling the power supply frequency of a washing machine. The method comprises the steps: an alternating power supply frequency is provided by a power supply device, and frequency signals are intercepted by a sampling device in a detecting circuit of power supply frequencies; sampling signals are conveyed into a microcomputer after treated by the detecting circuit of power supply frequencies, received detecting signals are judged, controlled and treated by a control program, and the detecting signals after treated are converted into control commands; the rotation of a washing machine motor is controlled by the control commands generated by the microcomputer, and the washing machine can work under different frequencies. An electronic circuit device of the system comprises the detecting circuit of power supply frequencies, other detecting devices and the microcomputer. A driving device for a washing machine of the system comprises the washing machine motor and other devices. The washing machine can be maintained to approach to optimal running effects under different power supply frequencies, and thus, the present invention can be universally used for areas with different power supply frequencies.
Description
One, technical field
The present invention relates to a kind of system and method for supply frequency of washing machine, refer in particular to a kind of system and method that is used for the supply frequency Automatic Detection and Control of washing machine.
Two, background technology
Present most electric washer all usability is answered Asynchronous Motor Driving.Because the AC power used of each department has 50Hz or the equifrequent difference of 60Hz in the world, therefore causes the difference of motor synchronous rotational speed, when same washing machine uses in different areas, the rotating speed of motor and and moment notable difference is arranged, influence operational effect.Washing machine manufactory will be the products export of same mechanical structure to different when regional, generally will be according to different supply frequencies in fixing corresponding the reaching of control circuit to operation time parameters near running effect, machine design is become different models, to keep close running effect.This has just reduced the versatility of product.
Chinese patent ZL97122989.9 discloses a kind of operation controller of washing machine, and by detecting the counter electromotive force after motor cuts off the power supply, the running time of FEEDBACK CONTROL motor is to eliminate the influence of different supply frequencies to the washing machine speed of service.The closed-loop control meeting produces unstable and has obviously improved cost.This design does not relate to other control except that dehydrating speed, the control of for example washing the current beat yet.Thereby the versatility problem of product still exists.
Three, summary of the invention
Defective at prior art, the object of the present invention is to provide a kind of simple in structure, the economical and practical washing machine that is used for detects the system and method for controlling, and changes corresponding operation time parameters automatically according to supply frequency, makes that washing machine can be general in different supply frequency areas.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of system that is used for the supply frequency Automatic Detection and Control of washing machine comprises: supply unit 110, electronic-circuit device 120 and drive unit of washing machine 130, and drive unit of washing machine 130 comprises washing machine motor 131; The output of supply unit 110 links to each other with the input of electronic-circuit device 120, and the output of electronic-circuit device 120 links to each other with the input of drive unit of washing machine 130; Described electronic-circuit device 120 comprises supply frequency testing circuit 121 and microcomputer 123, and the output of described supply frequency testing circuit 121 inserts the input of microcomputer 123, and the output signal of microcomputer 123 sends washing machine motor 131 to; It is characterized in that, described supply frequency testing circuit 121 is a power zero-crossing detection circuit, be by sample circuit, dc source and switch triode are formed, the input of sample circuit connects power supply, output connects the base stage of switch triode, and between the emitter stage-base stage of switch triode and be connected to filter capacitor, be used for the filtering higher hamonic wave, the emitter and collector of switch triode connects dc source, sample circuit send the switch triode base stage with the pulsating volage signal that AC power changes same frequency into, and the colelctor electrode of switch triode will produce with the frequency pulse signal and send microcomputer 123.
Sample circuit in the described supply frequency testing circuit 121 is a decompression rectifier filter circuit, and the AC power of certain frequency becomes the pulsating volage signal of same frequency behind the transformation rectifying and wave-filtering.
Sample circuit in the described supply frequency testing circuit 121 is the half-wave rectifying circuit of resistance or capacitance partial pressure.
The output of described supply frequency testing circuit 121 sends the power supply zero cross signal to the I/O mouth of microcomputer 123 or INT external interrupt mouth.
A kind of method that is used for the supply frequency Automatic Detection and Control of washing machine is characterized in that this method comprises the steps:
(a), detect: provide a supply frequency that exchanges by supply unit, pick up frequency signal by the sampling section in the supply frequency testing circuit, described frequency detection circuit is by sample circuit, dc source and switch triode are formed, the input of sample circuit connects power supply, output connects the base stage of switch triode, and between the emitter stage-base stage of switch triode and be connected to filter capacitor and be used for the filtering higher hamonic wave, the emitter and collector of switch triode connects dc source, sample circuit send the switch triode base stage with the pulsating volage signal that AC power changes same frequency into, and the colelctor electrode of switch triode will produce with the frequency pulse signal and send microcomputer
(b), control: detected supply frequency signal is delivered in the microcomputer, and by the processing that control program is judged, controlled received detection signal, detection signal after treatment converts control instruction to,
(c), carry out: the control instruction that slave microcomputer sends can work washing machine with the rotation of control washing machine motor under different frequency.
In step (a) detected, the sampling section in the supply frequency testing circuit adopted the mode of transformer step-down full-wave rectification to pick up frequency signal, provides the power supply zero cross signal to described microcomputer.
In step (a) detected, the sampling section in the supply frequency testing circuit adopted the mode of resistance or capacitance partial pressure halfwave rectifier to pick up frequency signal, provides the power supply zero cross signal to described microcomputer.
In step (b) control, described control program comprises supply frequency trace routine (210), time parameter control program (220), the supply frequency trace routine reads power detection signal (211), and judge the height of supply frequency (212), the signal that judgement draws is passed to the time parameter control program, thereby call current beat, dewatering time parameter (221), operation (222) speed of control washing machine motor.
In step (b) control, sampled signal is delivered to microcomputer, and its internal control program step is as follows:
(1) initialization start program is given the accumulator zero clearing earlier, and the initial value of timer is set then;
(2) when signal reaches, drive timer and interrupt, open the INT external interrupt;
(3) if signal is delivered to the INT mouth of microcomputer in step (2), accumulator adds 1, returns step (2) then;
(4) if signal is delivered to the I/O mouth of microcomputer in step (2), read I/O mouth state,, forward the I/O mouth state of reading after accumulator adds 1 to if I/O mouth state changes; If I/O mouth state does not change, also forward the I/O mouth state of reading to;
(5) the continuous recording impulse number of accumulator when timer overflows interruption, stops accumulator count, and the initial value of numerical value in the accumulator and setting is judged comparison;
(6) if accumulator value is called big parameter greater than setting initial value in the step (5), step (2) is returned in the accumulator zero clearing; If accumulator value is called little parameter less than setting initial value in the step (5), step (2) is returned in the accumulator zero clearing.
Described supply frequency trace routine writes down described zero cross signal pulse number in the unit interval, and compares with setting value.
Use beneficial effect of the present invention to be: the supply frequency testing circuit is with the square-wave pulse signal that measures, after the processing of microcomputer to signal judgment, control program, function with automatic detection and control, automatically change corresponding operation time parameters according to supply frequency, make washing machine under the different electrical power frequency, keep running effect preferably, thereby can be common to the area of different electrical power frequency.In addition, the control scheme that the present invention the adopts realization of can in the washing machine electronic program controller of prior art, programme, circuit structure is simple, and controls for open loop, can not produce problem of unstable such as vibration.
Four, description of drawings
Fig. 1 is the supply frequency automatic detection and control system of embodiment of the invention washing machine;
Fig. 1 (a) is the control program flow chart of microcomputer and control program among Fig. 1;
Fig. 2 is the supply frequency testing circuit figure of embodiment of the invention washing machine;
Fig. 3 is that the present invention is the main program flow chart that the supply frequency of the present invention the 1st embodiment detects single-chip microprocessor MCU in the control program;
Fig. 3 (a) is the INT external interrupt service subprogram flow chart of the present invention the 1st embodiment;
Fig. 3 (b) is the timer interrupt service routine flow chart of the present invention the 1st embodiment;
Fig. 4 is the supply frequency discriminating program flow chart of the present invention the 2nd embodiment;
Fig. 4 (a) is the timer interrupt service routine flow chart of the present invention the 2nd embodiment.
Five, the specific embodiment
It is as follows to be elaborated with the automatic detection and control system with 50Hz and two kinds of supply frequencies of 60Hz below, and this detection control system and method can be implemented in the electronic washing machine of impeller-type, stirring-type or drum-type.
As shown in Figure 1, be the supply frequency automatic checkout system of embodiment of the invention washing machine.Comprise supply unit 110, electronic-circuit device 120 and drive unit of washing machine 130; The output of supply unit 110 links to each other with the input of electronic-circuit device 120, and the output of electronic-circuit device 120 links to each other with the input of drive unit of washing machine 130; Electronic-circuit device 120 comprises supply frequency testing circuit 121, other detection means 122, microcomputer and control program 123, described drive unit of washing machine 130 comprises washing machine motor 131 and other electrical equipment 132, the ac signal of described supply frequency testing circuit 121 after with transformation, rectification becomes square-wave pulse signal, the pulse signal that obtains is transported in microcomputer and the control program 123, after the processing of microcomputer to signal judgment, control program, thereby output order is with the rotation of control washing machine motor 131.Use therein supply frequency testing circuit 121 is a power supply zero passage frequency detection circuit.
Shown in Fig. 1 (a), be the microcomputer among Fig. 1 and the control program flow chart of control program.It comprises supply frequency trace routine 210 and time parameter control program 220, and its concrete steps are as follows:
At first, the signal of the supply frequency testing circuit 211 that is provided by supply frequency testing circuit 121 is provided supply frequency trace routine 210; Then, judge the height of supply frequency 212; The result who judges sends time parameter control program 220 to, again by described time parameter control program 220, calls current beat, dewatering time parameter 221, sends the operation 222 of instruction control washing machine motor 131 at last.
As shown in Figure 2, be the supply frequency testing circuit figure of embodiment of the invention washing machine.Specifically this supply frequency testing circuit 121 belongs to power supply zero passage frequency detection circuit, formed by sample circuit, dc source and transistor switching circuit and 87C1202 type single-chip microprocessor MCU, wherein, sample circuit is made up of transformer TR, rectifier bridge D1 one D4, resistance R 1, R2, capacitor C 1, C1 wherein is a high-frequency filter capacitor, is used for the filtering higher hamonic wave; Dc source is the 5V dc source, and transistor switching circuit produces pulse signal altogether; Transistor switching circuit is formed, is connected to the shaping circuit of being made up of resistance R 4 and capacitor C 2 between output of the colelctor electrode of triode and single-chip microprocessor MCU by NPN type triode, collector resistance R3, the square-wave voltage of triode output is become pulse voltage, the voltage transformation that transformer TR provides supply unit 110 is to about the 10V, after the rectification through rectifier bridge D1-D4, ac signal is become set of pulses signal, deliver to the INT external interrupt mouth or the I/O mouth of single-chip microprocessor MCU, read this power supply zero passage interrupt signal by single-chip microprocessor MCU.The sampling section of supply frequency testing circuit also can adopt resistance or capacitance partial pressure half-wave rectifying circuit except as Fig. 2 transformer step-down full-wave rectifying circuit.Described supply frequency testing circuit is a power zero-crossing detection circuit, the input of sample circuit connects power supply, output connects the base stage of switch triode, and between the emitter stage-base stage of switch triode and be connected to filter capacitor, be used for the filtering higher hamonic wave, the emitter and collector of switch triode connects the 5V dc source, sample circuit send the switch triode base stage with the pulsating volage signal that AC power changes same frequency into, and the colelctor electrode of switch triode will produce with the frequency pulse signal and send microcomputer 123 after the shaping circuit shaping.
In the signal processing of single-chip microprocessor MCU, because the zero passage interrupt signal is obtained by the ac signal conversion, the number of square-wave pulse signal has reflected the number of times of AC power zero passage, has also promptly reflected the frequency of AC power.Single-chip microprocessor MCU is noted the number of signal pulse in the regular hour, according to the frequency that how much can judge power supply of umber of pulse.
Then, single-chip microprocessor MCU selects the time corresponding parameter to control the operation of laundry motor according to detected supply frequency by the time parameter control program, when washing machine is worked under different frequency, can both obtain clean result preferably.
Just export zero cross signal below and give the INT external interrupt mouth or the I/O mouth of single-chip microprocessor MCU respectively, designed microcomputer and control program are elaborated.
Fig. 3, Fig. 3 (a), Fig. 3 (b) are zero cross signals when delivering to the INT mouth of single-chip microprocessor MCU, the embodiment of microcomputer and control program.As shown in Figure 3, be the main program flow chart of single-chip microprocessor MCU.After program initialization execution in step 300 beginning, execution in step 301 is the accumulator zero clearing, and execution in step 302 is provided with initial value to timer then, and wherein, step 302 is to choose according to the time of the single-chip microprocessor MCU clock frequency and the required record square wave number of programming.If the initial value 302 of timer was got 0.5 second, when supply frequency is 50Hz, can record about 50 pulses, when supply frequency is 60Hz, can record about 60 pulses, the difference of 10 umber of pulses is just arranged between 50Hz and the 60Hz, so just supply frequency can have been distinguished.After the program initialization, execution in step 303 is driven timer and is interrupted, and then execution in step 304 is opened the INT external interrupt.When zero cross signal arrived the INT mouth, program changed the INT interrupt service subroutine over to.Shown in Fig. 3 (a), be INT external interrupt service subprogram flow chart, in this subprogram, execution in step 304INT external interrupt begins, and execution in step 305 accumulators add 1 numeration then, and then execution in step 306 is returned main program.Therefore, accumulator has write down the umber of pulse of INT mouth, overflows interruption up to timer.Program forwards timer to and overflows interrupt service subroutine.Shown in Fig. 3 (b), be timer interrupt service routine flow chart, in this subprogram, step 303 timer interrupts beginning, at first stops accumulator count, numerical value in the accumulator and setting value is compared again.With timer regularly is 0.5 second, and setting value is 55, enters step 307 accumulator value and compares in 55: if accumulator value less than 55, then program is judged to 50Hz with supply frequency, calls 50Hz parameter 308; If accumulator value is greater than 55, then program is judged to 60Hz with supply frequency, and execution in step 309 is called the 60Hz parameter, call different parameters after, execution in step 310 accumulator zero clearings, last execution in step 311 is returned.
Like this, program is called different parameter operations according to the supply frequency discrimination result, has realized that cyclelog is general under different frequencies.This embodiment is the tracking power supply frequency at any time, controls according to supply frequency, and adaptability is better.
Fig. 4, Fig. 4 (a) are zero cross signals when delivering to a certain I/O mouth of single-chip microprocessor MCU, the embodiment of microcomputer and control program.As shown in Figure 4, be single-chip microprocessor MCU supply frequency discriminating program flow chart.When connecting power supply, at first enter the frequency discriminating program, program initialization begins 400, with accumulator zero clearing 401, to timer initial value 402 is set then.Choosing of the initial value of timer is identical with the method for the 1st embodiment, just no longer has been described in detail here.After the program initialization, execution in step 403 starts timer and interrupts timing.Program is constantly read I/O mouth state 404, changes when becoming 1 by 0 when recording I/O mouth state, and execution in step 406 accumulators add 1 counting; When recording the change of I/O mouth state is not when becoming 1 by 0, then to return step and read I/O mouth state 404, continues to read I/O mouth state, overflows interruption up to timer, and program forwards timer to and overflows interrupt service subroutine.More than design is the state that picks up by 0 change 1 about I/O mouth status detection, i.e. the rising edge of pulse can certainly be designed to pick up the state by 1 change 0, i.e. the trailing edge of pulse.Fig. 4 (a) is a timer interrupt service subroutine flow chart, and flow chart Fig. 3 (b) effect of the timer interrupt service subroutine among this subprogram and the embodiment 1 is identical with step, just no longer has been described in detail here.
After determining supply frequency, call relevant parameter, change the operation of laundry main program over to.This embodiment only detects supply frequency when start, control according to this supply frequency, and stability better.
More than be implemented on the monolithic processor controlled washing machine electronic program controller of prior art and realize: when the program composition of program controller, after the process of finishing above-mentioned automatic identification supply frequency, difference according to cycle of 50Hz and 60Hz, according to the principle of keeping approaching running effect, setting is called when different frequency for program corresponding to two groups of time parameters of two kinds of frequencies.Described approaching running effect and time corresponding parameter can be by obtaining in the laundry operation test of same drive unit of washing machine under two kinds of frequencies.So just realized that washing machine all can be general under the supply frequency of 50Hz and 60Hz.
Claims (10)
1. system that is used for the supply frequency Automatic Detection and Control of washing machine comprises: supply unit (110), electronic-circuit device (120) and drive unit of washing machine (130), and drive unit of washing machine (130) comprises washing machine motor (131); The output of supply unit (110) links to each other with the input of electronic-circuit device (120), and the output of electronic-circuit device (120) links to each other with the input of drive unit of washing machine (130); Described electronic-circuit device (120) comprises supply frequency testing circuit (121) and microcomputer (123), the output of described supply frequency testing circuit (121) inserts the input of microcomputer (123), and the output signal of microcomputer (123) sends washing machine motor (131) to; It is characterized in that, described supply frequency testing circuit (121) is a power zero-crossing detection circuit, be by sample circuit, dc source and switch triode are formed, the input of sample circuit connects power supply, output connects the base stage of switch triode, and between the emitter stage-base stage of switch triode and be connected to filter capacitor, be used for the filtering higher hamonic wave, the emitter and collector of switch triode connects dc source, sample circuit send the switch triode base stage with the pulsating volage signal that AC power changes same frequency into, and the colelctor electrode of switch triode will produce with the frequency pulse signal and send microcomputer (123).
2. according to the described system that is used for the supply frequency Automatic Detection and Control of washing machine of claim 1, it is characterized in that, sample circuit in the described supply frequency testing circuit (121) is a decompression rectifier filter circuit, and the AC power of certain frequency becomes the pulsating volage signal of same frequency behind the transformation rectifying and wave-filtering.
3. according to the described system that is used for the supply frequency Automatic Detection and Control of washing machine of claim 1, it is characterized in that the sample circuit in the described supply frequency testing circuit (121) is the half-wave rectifying circuit of resistance or capacitance partial pressure.
4. according to the described system that is used for the supply frequency Automatic Detection and Control of washing machine of claim 2, it is characterized in that the output of described supply frequency testing circuit (121) sends the power supply zero cross signal in the I/O mouth or the INT external interrupt mouth of microcomputer (123).
5. a method that is used for the supply frequency Automatic Detection and Control of washing machine is characterized in that this method comprises the steps:
(a), detect: provide a supply frequency that exchanges by supply unit, pick up frequency signal by the sampling section in the supply frequency testing circuit, described supply frequency testing circuit is by sample circuit, dc source and switch triode are formed, the input of sample circuit connects power supply, output connects the base stage of switch triode, and between the emitter stage-base stage of switch triode and be connected to filter capacitor and be used for the filtering higher hamonic wave, the emitter and collector of switch triode connects dc source, sample circuit send the switch triode base stage with the pulsating volage signal that AC power changes same frequency into, and the colelctor electrode of switch triode will produce with the frequency pulse signal and send microcomputer
(b), control: detected supply frequency signal is delivered in the microcomputer, and by the processing that control program is judged, controlled received detection signal, detection signal after treatment converts control instruction to,
(c), carry out: the control instruction that slave microcomputer sends can work washing machine with the rotation of control washing machine motor under different frequency.
6. according to the described supply frequency automatic detection control method that is used for washing machine of claim 5, it is characterized in that, in step (a) detects, sampling section in the supply frequency testing circuit adopts the mode of transformer step-down full-wave rectification to pick up frequency signal, provides the power supply zero cross signal to described microcomputer.
7. according to the described supply frequency automatic detection control method that is used for washing machine of claim 5, it is characterized in that, in step (a) detects, sampling section in the supply frequency testing circuit adopts the mode of resistance or capacitance partial pressure halfwave rectifier to pick up frequency signal, provides the power supply zero cross signal to described microcomputer.
8. according to the described supply frequency automatic detection control method that is used for washing machine of claim 5, it is characterized in that, in step (b) control, described control program comprises supply frequency trace routine (210), time parameter control program (220), the supply frequency trace routine reads power detection signal (211), and judge the height of supply frequency (212), the signal that judgement draws is passed to the time parameter control program, thereby call current beat, dewatering time parameter (221), operation (222) speed of control washing machine motor.
9. according to the described supply frequency automatic detection control method that is used for washing machine of claim 5, it is characterized in that in step (b) control, sampled signal is delivered to microcomputer, its internal control program step is as follows:
(1) initialization start program is given the accumulator zero clearing earlier, and the initial value of timer is set then;
(2) when signal reaches, drive timer and interrupt, open the INT external interrupt;
(3) if signal is delivered to the INT mouth of microcomputer in step (2), accumulator adds 1, returns step (2) then;
(4) if signal is delivered to the I/O mouth of microcomputer in step (2), read I/O mouth state,, forward the I/O mouth state of reading after accumulator adds 1 to if I/O mouth state changes; If I/O mouth state does not change, also forward the I/O mouth state of reading to;
(5) the continuous recording impulse number of accumulator when timer overflows interruption, stops accumulator count, and the initial value of numerical value in the accumulator and setting is judged comparison;
(6) if accumulator value is called big parameter greater than setting initial value in the step (5), step (2) is returned in the accumulator zero clearing; If accumulator value is called little parameter less than setting initial value in the step (5), step (2) is returned in the accumulator zero clearing.
10. according to the described method that is used for the supply frequency Automatic Detection and Control of washing machine of claim 9, it is characterized in that described supply frequency trace routine writes down described zero cross signal pulse number in the unit interval, and compare with setting value.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021346356A CN1260422C (en) | 2002-09-03 | 2002-09-03 | System for automatic detecting and controlling power supply frequency and method applied to waching machine |
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| CNB021346356A CN1260422C (en) | 2002-09-03 | 2002-09-03 | System for automatic detecting and controlling power supply frequency and method applied to waching machine |
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| CN1260422C true CN1260422C (en) | 2006-06-21 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101895251A (en) * | 2010-07-20 | 2010-11-24 | 天津市亚安科技电子有限公司 | Pan/tilt motor current-limiting control circuit |
| CN104166045B (en) * | 2013-05-15 | 2016-12-28 | 海洋王（东莞）照明科技有限公司 | A kind of ac power supply frequency detecting device |
| CN103852638B (en) * | 2014-03-19 | 2016-03-23 | 成都引众数字设备有限公司 | For detecting the testing circuit of power frequency output frequency |
| CN108957122A (en) * | 2017-05-17 | 2018-12-07 | 佛山市顺德区美的电热电器制造有限公司 | A kind of frequency determination methods and device of voltage |
| CN107831357A (en) * | 2017-11-27 | 2018-03-23 | 深圳市锐钜科技有限公司 | Single-phase alternating current zero cross detection circuit and detection method based on light-coupled isolation |
| CN107807272A (en) * | 2017-11-27 | 2018-03-16 | 深圳市锐钜科技有限公司 | Single-phase alternating current zero cross detection circuit and detection method based on transformer isolation |
| CN113529347B (en) * | 2020-04-16 | 2023-06-20 | 青岛胶南海尔洗衣机有限公司 | AC power supply frequency detection method, device and clothes treatment system |
| CN117478140B (en) * | 2023-12-26 | 2024-03-15 | 四川莱福德科技有限公司 | High-precision full-voltage alternating current-direct current sampling circuit and method for LED power supply |
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