CN201639529U - Interface circuit of DC (direct currrent) brushless electric machine and dishwasher - Google Patents
Interface circuit of DC (direct currrent) brushless electric machine and dishwasher Download PDFInfo
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- CN201639529U CN201639529U CN2010201211153U CN201020121115U CN201639529U CN 201639529 U CN201639529 U CN 201639529U CN 2010201211153 U CN2010201211153 U CN 2010201211153U CN 201020121115 U CN201020121115 U CN 201020121115U CN 201639529 U CN201639529 U CN 201639529U
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- optocoupler
- interface circuit
- brushless motor
- control signal
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Abstract
The utility model relates to a dishwasher and an interface circuit of a DC brushless electric machine. The interface circuit is used for receiving a control signal from an upper computer; the control signal controls the rotating speed of the DC brushless electric machine through a controller; the interface circuit comprises a first optical coupler and a pull-up resistor, wherein the positive pole of the input end of the first optical coupler is connected with the control signal output end of the upper computer; the negative pole of the input end of the first optical coupler is earthed; the positive pole of the first optical coupler is connected with the input end of the controller; the negative pole of the output end of the first optical coupler is earthed; and the pull-up resistor is connected between the positive poles of the output end of the high-level first optical coupler. When the technical scheme of the utility model is implemented, firstly, the circuit design is simple; secondly, the circuit does not need to adopt a relay, the service life of the circuit can not be decreased due to the decrease of the service life of the relay; and finally, the coupler enables an external signal to be isolated from an electric machine drive control signal, and thus, an electric machine drive control circuit is not interfered by an external circuit.
Description
Technical field
The utility model relates to a kind of interface circuit of dc brushless motor, also relates to a kind of dishwasher.
Background technology
In traditional electrical equipment or mechanical system, as dishwasher, fan, water pump, refrigerator etc., the control mode that comprises the host computer of man-machine interface and power motor be by relay unlatching, close and control motor status, make motor be in running status or halted state.The reliability of this communication modes is decided by relay, because the flower of lighting a fire that do not stop production when relay closes makes the contact point oxidation, makes relay significantly reduce useful life, thereby has influence on the useful life of whole electrical equipment or mechanical system.
The utility model content
The technical problems to be solved in the utility model is, above-mentioned defective at prior art, a kind of interface circuit of dc brushless motor is provided, this interface circuit is owing to need not to adopt relay, and the electrical equipment of using this interface circuit or the life-span of mechanical system are reduced.
The technical scheme that its technical problem that solves the utility model adopts is: the interface circuit of constructing a kind of dc brushless motor, be used to receive control signal from host computer, this control signal is by the rotating speed of controller control dc brushless motor, described interface circuit comprises first optocoupler and pull-up resistor, wherein, the input anode of described first optocoupler connects the control signal output ends of described host computer, the input cathode ground connection of described first optocoupler, the output head anode of described first optocoupler connects the input of described controller, the negative pole of output end ground connection of described first optocoupler, described pull-up resistor is connected between the output head anode of described first optocoupler of high level.
In the interface circuit of dc brushless motor described in the utility model, also comprise second optocoupler, the input anode of described second optocoupler connects high level, the input cathode of described second optocoupler connects the output of described controller, the output head anode of described second optocoupler connects the feedback end of described host computer, the negative pole of output end ground connection of described second optocoupler.
In the interface circuit of dc brushless motor described in the utility model, also comprise first electric capacity that is connected between described second optocoupler input anode and the described second optocoupler input cathode.
In the interface circuit of dc brushless motor described in the utility model, also comprise diode, the positive pole of described diode connects the negative pole of output end of described second optocoupler, and the negative pole of described diode connects the output head anode of described second optocoupler.
In the interface circuit of dc brushless motor described in the utility model, described control signal is the PWM square wave.
In the interface circuit of dc brushless motor described in the utility model, the scope of the duty ratio of described PWM square wave is 10%-90%.
In the interface circuit of dc brushless motor described in the utility model, described control signal is sinusoidal wave.
In the interface circuit of dc brushless motor described in the utility model, also comprise second electric capacity that is connected between described first optocoupler output head anode and the described first optocoupler negative pole of output end, and be connected the 3rd electric capacity between described first optocoupler input anode and the described first optocoupler input cathode.
In the interface circuit of dc brushless motor described in the utility model, also comprise the resistance between the control signal output ends of the input anode that is connected described first optocoupler and host computer.
The utility model is also constructed a kind of dishwasher, comprises the interface circuit of above-described dc brushless motor.
Implement the interface circuit and the dishwasher of dc brushless motor of the present utility model, have following beneficial effect:
At first, the control signal of passive input directly transfers to controller by optocoupler, and therefore, circuit design is simple;
Secondly because this circuit need not to adopt relay, so the life-span of this circuit can not reduce because of the minimizing in relay useful life;
At last, optocoupler makes external signal and motor-driven control signal isolated, makes motor driving controling circuit not be subjected to the interference of external circuit.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit diagram of the interface circuit embodiment one of the utility model dc brushless motor;
Fig. 2 is the circuit diagram of the interface circuit embodiment one of the utility model dc brushless motor.
Embodiment
As shown in Figure 1, in the circuit diagram of the interface circuit embodiment one of dc brushless motor of the present utility model, this interface circuit comprises optocoupler U1 and pull-up resistor R1, the input anode of optocoupler U1 connects the control signal output ends Freq_in of host computer, to receive control signal, the input cathode ground connection of optocoupler U1, the output head anode of optocoupler U1 connects the input in of controller U2, the negative pole of output end ground connection of optocoupler U1, pull-up resistor R1 is connected between the output head anode of high level VCC and optocoupler U1.When this interface circuit work, the control signal that optocoupler U1 is received can be sinusoidal wave, also can be that duty ratio is the PWM square wave in the 10%-90% scope, the rotating speed of the corresponding dc brushless motor of the frequency of this control signal, for example, the scope of the frequency of control signal is 100HZ-160HZ, and its corresponding motor speed is 2000RPM-3200RPM, also is the corresponding 20RPM of 1HZ.If the control signal that input anode received of optocoupler U1 is that frequency is 120HZ, duty ratio is 50% square wave, its output head anode also is that output frequency is that 120HZ, duty ratio are 50% square wave, as long as controller U2 has detected signal, and this signal is kept more than the Preset Time, 65ms for example, just think that communication protocol sets up, the control signal that is received according to its input in is calculated the frequency of this control signal then, and according to the rotating speed of the FREQUENCY CONTROL dc brushless motor (not shown) that is calculated.
Fig. 2 is the circuit diagram of the interface circuit embodiment two of dc brushless motor of the present utility model, in this embodiment, the input anode of optocoupler U1 meets the control signal output ends Freq_in of host computer by resistance R 2, to receive control signal, the input cathode ground connection of optocoupler U1, capacitor C 3 is connected between the input anode and input cathode of optocoupler U1, the output head anode of optocoupler U1 meets the input in of controller U2, the negative pole of output end ground connection of optocoupler U1, pull-up resistor R1 is connected between the output head anode of high level VCC and optocoupler U1, and capacitor C 2 is connected between the output head anode and negative pole of output end of optocoupler U1.The input anode of optocoupler U3 meets high level VCC, its negative pole of output end meets the output out of controller U2, capacitor C 1 is connected between the input anode and input cathode of optocoupler U3, the output head anode of optocoupler U3 meets the feedback end Freq_out of host computer (not shown), to feed back the control signal that this interface circuit is received, the negative pole of output end ground connection of optocoupler U3, the negative pole of diode D1 connects the output head anode of optocoupler U3, and the negative pole of diode D1 connects the negative pole of output end of optocoupler U3.
The operation principle of this interface circuit below is described, if the control signal from host computer that optocoupler U1 is received is that frequency is 120HZ, duty ratio is 50% square-wave signal, this control signal exports controller U2 to by optocoupler U1, as long as controller U2 has detected signal, and this signal is kept more than the Preset Time, 65ms for example, just think that communication protocol sets up, the control signal that is received according to its input in is calculated the frequency of this control signal then, and according to the rotating speed of the FREQUENCY CONTROL dc brushless motor (not shown) that is calculated, in case dc brushless motor operation work, controller U2 will export the control signal that is received to optocoupler U3 by its output out, optocoupler U3 feeds back to the feedback end of host computer with this control signal then, and host computer just can judge whether controller receives this control signal according to the control signal of its feedback end.
The utility model is also constructed a kind of DC frequency-changing dishwasher, comprises above-described interface circuit, and the explanation of this interface circuit is not given unnecessary details at this.
Implement the interface circuit of dc brushless motor of the present utility model, circuit design is simple, adopt the optocoupler of two isolation to come transmission signals, a control signal that is used for receiving host computer, one is used for to the host computer feedback control signal, this communication mode makes host computer and controller isolated, thereby makes the signal transmission more reliable and more stable, not disturbed by the signal of other circuit.In addition, use this interface circuit, make that also the communications protocol between host computer and the controller is simple, pass through optocoupler U1, and keep the default time as long as controller has detected signal, just think that communications protocol sets up, and then calculate the frequency of this signal, and according to the rotating speed of the FREQUENCY CONTROL dc brushless motor that is calculated, dc brushless motor is in case operation, controller will send with control signal, and feeds back to host computer by optocoupler U3.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present utility model.
Claims (10)
1. the interface circuit of a dc brushless motor, be used to receive control signal from host computer, this control signal is by the rotating speed of controller control dc brushless motor, it is characterized in that, described interface circuit comprises first optocoupler (U1) and pull-up resistor (R1), wherein, the input anode of described first optocoupler (U1) connects the control signal output ends of described host computer, the input cathode ground connection of described first optocoupler (U1), the output head anode of described first optocoupler (U1) connects the input of described controller (U2), the negative pole of output end ground connection of described first optocoupler (U1), described pull-up resistor (R1) are connected between the output head anode of high level and described first optocoupler (U1).
2. the interface circuit of dc brushless motor according to claim 1, it is characterized in that, also comprise second optocoupler (U3), the input anode of described second optocoupler (U3) connects high level, the input cathode of described second optocoupler (U3) connects the output of described controller (U2), the output head anode of described second optocoupler (U3) connects the feedback end of described host computer, the negative pole of output end ground connection of described second optocoupler (U3).
3. the interface circuit of dc brushless motor according to claim 2 is characterized in that, also comprises first electric capacity (C1) that is connected between described second optocoupler (U3) input anode and described second optocoupler (U3) input cathode.
4. the interface circuit of dc brushless motor according to claim 2, it is characterized in that, also comprise diode (D1), the positive pole of described diode (D1) connects the negative pole of output end of described second optocoupler (U3), and the negative pole of described diode connects the output head anode of described second optocoupler (U3).
5. the interface circuit of dc brushless motor according to claim 1 is characterized in that, described control signal is the PWM square wave.
6. the interface circuit of dc brushless motor according to claim 5 is characterized in that, the scope of the duty ratio of described PWM square wave is 10%-90%.
7. the interface circuit of dc brushless motor according to claim 1 is characterized in that, described control signal is sinusoidal wave.
8. the interface circuit of dc brushless motor according to claim 1, it is characterized in that, also comprise second electric capacity (C2) that is connected between described first optocoupler (U1) output head anode and described first optocoupler (U1) negative pole of output end, and be connected the 3rd electric capacity (C3) between described first optocoupler (U1) input anode and described first optocoupler (U1) input cathode.
9. the interface circuit of dc brushless motor according to claim 1 is characterized in that, also comprises the resistance (R2) between the control signal output ends of the input anode that is connected described first optocoupler (U1) and host computer.
10. dishwasher comprises the interface circuit of each described dc brushless motor of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201211153U CN201639529U (en) | 2010-02-26 | 2010-02-26 | Interface circuit of DC (direct currrent) brushless electric machine and dishwasher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201211153U CN201639529U (en) | 2010-02-26 | 2010-02-26 | Interface circuit of DC (direct currrent) brushless electric machine and dishwasher |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201639529U true CN201639529U (en) | 2010-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201211153U Expired - Fee Related CN201639529U (en) | 2010-02-26 | 2010-02-26 | Interface circuit of DC (direct currrent) brushless electric machine and dishwasher |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201639529U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812395A (en) * | 2012-11-02 | 2014-05-21 | 控制技术有限公司 | Circuit for monitoring the operation of an electric motor and motor drive circuit including the same |
| CN110279322A (en) * | 2019-02-20 | 2019-09-27 | 浙江绍兴苏泊尔生活电器有限公司 | Cooking machine |
-
2010
- 2010-02-26 CN CN2010201211153U patent/CN201639529U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812395A (en) * | 2012-11-02 | 2014-05-21 | 控制技术有限公司 | Circuit for monitoring the operation of an electric motor and motor drive circuit including the same |
| CN110279322A (en) * | 2019-02-20 | 2019-09-27 | 浙江绍兴苏泊尔生活电器有限公司 | Cooking machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101117 Termination date: 20160226 |