CN205232068U - Starting protection circuit of single phase alternating current load - Google Patents
Starting protection circuit of single phase alternating current load Download PDFInfo
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- CN205232068U CN205232068U CN201520984148.3U CN201520984148U CN205232068U CN 205232068 U CN205232068 U CN 205232068U CN 201520984148 U CN201520984148 U CN 201520984148U CN 205232068 U CN205232068 U CN 205232068U
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- switch
- input
- alternating current
- circuit
- single phase
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Abstract
The utility model discloses a safe and reliable, and can reduce the starting protection circuit of single phase alternating current load of pick -up current, include: starting switch, microprocessor, supply circuit, control signal circuit, controllable electronic switch, synchronization signal circuit and with the control signal switch of starting switch linkage, this control signal switch is later to the starting switch switch -on, prior to the starting switch disconnection, the both ends of control signal switch are continuous with the output of control signal circuit and microprocessor's microprocessor 4 input respectively, controllable electronic switch goes here and there income in the NULL return circuit of single phase alternating current load, controllable electronic switch's control end is through linking to each other with microprocessor's corresponding output with this controllable electronic switch matched with current -limiting resistor, a pair of input of synchronization signal circuit with a pair of AC input one -to -one link to each other, the output of synchronization signal circuit links to each other with microprocessor's corresponding input. The utility model discloses can extensively be applicable to among the various interchange electric tool.
Description
Technical field
The utility model relates to a kind of starting protection circuit of AC load, refers more particularly to a kind of starting protection circuit of single phase alternating current (A.C.) load.
Background technology
As everyone knows, alternating current machine is when full voltage directly starts, starting current can reach the 4-7 of rated current doubly, when capacity motor is larger, electric current during electric motor starting, not only can cause the sharply decline of line voltage, cause power network fluctuation, directly impact is with the normal operation of other electric equipment under electrical network; And a large amount of high order harmonic components contained in starting current can cause high-frequency resonant with electrical network, also can cause electric equipment misoperation, control the faults such as malfunctioning.In addition, the heat that big current produces and impulsive force can make motor accelerated ageing or produce fault, thus reduce electrical machinery life; When practical application, when the electric tool that above-mentioned motor is housed runs into the unexpected power-off of electrical network, if switch does not close, after power system restoration, electric tool starts immediately, imagine now electric tool and be just positioned over work top or just in improper operation, electric motor starting can cause immeasurable harm, especially for hand held electric tool.In fact, even if be non-hand held electric tool, in unattended lower starting, also can cause energy waste or cause other to endanger.
Utility model content
Technical problem to be solved in the utility model is: provide a kind of safe and reliable and can reduce the starting protection circuit of the single phase alternating current (A.C.) load of starting current.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: the starting protection circuit of single phase alternating current (A.C.) load, comprise: starting switch, microprocessor, the power supply circuits of power supply are provided to microprocessor, control signal circuit, controllable electronic switch, synchronous signal circuit, and the control signal switch to link with starting switch, described starting switch is prior to control signal switch connection, after disconnect in control signal switch, one end of control signal switch is connected with the output of control signal circuit, the other end of control signal switch is connected with the respective input of microprocessor, described power supply circuits are provided with a pair for connecting the ac input end of single phase alternating current power supply, described starting switch is connected in series in the input circuit of one of them ac input end, described controllable electronic switch seals in the ac input circuit of described single phase alternating current (A.C.) load, the control end of controllable electronic switch is by being connected with the corresponding output end of microprocessor with the current-limiting resistance that this controllable electronic switch matches, a pair input of described synchronous signal circuit is connected with a pair described ac input end one_to_one corresponding, and the output of synchronous signal circuit is connected with the respective input of microprocessor.
As a kind of preferred version; in the starting protection circuit of described single phase alternating current (A.C.) load; described power supply circuits comprise: filter circuit, voltage-stabiliser tube, isolating diode and dropping resistor; the negative pole of voltage-stabiliser tube is connected with the live wire input in a pair ac input end, as the power end of power supply circuits; the positive pole of voltage-stabiliser tube as power supply circuits earth terminal and be connected with the zero line input in a pair ac input end with dropping resistor by the isolating diode be serially connected, described filter circuit is attempted by described voltage-stabiliser tube.
As a kind of preferred version, in the starting protection circuit of described single phase alternating current (A.C.) load, described filter circuit comprises: at least one high-frequency filter capacitor and at least one low frequency filtering electric capacity.
As a kind of preferred version; in the starting protection circuit of described single phase alternating current (A.C.) load; described synchronous signal circuit comprises: synchronous diode and synchronous resistance; the positive pole of synchronous diode is connected with one end of synchronous resistance, as the output of synchronous signal circuit; the negative pole of synchronous diode is connected with described live wire input, and the other end of synchronous resistance is connected with described zero line input.
As a kind of preferred version, in the starting protection circuit of described single phase alternating current (A.C.) load, between the output of described synchronous signal circuit and the ground wire of power supply circuits, be connected to synchronous filtering electric capacity.
As a kind of preferred version, in the starting protection circuit of described single phase alternating current (A.C.) load, described controllable electronic switch is bidirectional triode thyristor, and the anode of bidirectional triode thyristor is connected with live wire input, and the negative electrode of bidirectional triode thyristor is connected to single phase alternating current (A.C.) load.
As a kind of preferred version, in the starting protection circuit of described single phase alternating current (A.C.) load, between the anode of described bidirectional triode thyristor and negative electrode, be connected to piezo-resistance.
As a kind of preferred version; in the starting protection circuit of described single phase alternating current (A.C.) load; described control signal circuit comprises: a pair divider resistance; this is connected to one end of divider resistance, as the output of described control signal circuit, this is connected with the earth terminal of power supply circuits with live wire input respectively to the other end of divider resistance.
The beneficial effects of the utility model are: due to starting switch of the present utility model prior to control signal switch connection, after disconnect in control signal switch, like this, microprocessor just can in steady operation reprocessing control signal, and when unexpected power failure is sent a telegram here, microprocessor can be in connection (self-locking) state to control signal switch by automatic sensing always, thus can controllable electronic switch be turned off, avoid the abnormity start of described AC load, make the work of whole circuit more reliable and more stable, eliminate potential safety hazard; In addition, due to the existence of controllable electronic switch, the soft start of described AC load can be realized, greatly reduce starting current, extend the useful life of described AC load.
Accompanying drawing explanation
Fig. 1 is the electric principle assumption diagram of the starting protection circuit of single phase alternating current (A.C.) load described in the utility model.
In figure: in dotted line, element is not on PCB, * is for selecting element.
Embodiment
Below in conjunction with accompanying drawing, describe the specific embodiments of the starting protection circuit of single phase alternating current (A.C.) load described in the utility model in detail:
As shown in Figure 1, the starting protection circuit of a kind of single phase alternating current (A.C.) load described in the utility model, comprise: starting switch S1, model is the microprocessor IC of attiny10, the power supply circuits of power supply are provided to microprocessor IC, control signal circuit, as the bidirectional triode thyristor Q1 of controllable electronic switch, synchronous signal circuit, and the control signal switch S 2 to link with starting switch S1, connect in starting switch S1 after this control signal switch S 2, disconnect prior to starting switch S1, one end of control signal switch S 2 is connected with the output of described control signal circuit, the other end of control signal switch S 2 is connected with the PB1 pin (3 pin) of microprocessor IC, described power supply circuits comprise: filter circuit, voltage-stabiliser tube Z1, isolating diode D1 and dropping resistor R1, the negative pole of voltage-stabiliser tube Z1 is connected with the input of live wire input and live wire L, as the power end VCC of described power supply circuits, the positive pole of voltage-stabiliser tube Z1 is as the earth terminal GND (also claiming ground wire) of power supply circuits, the negative pole of isolating diode D1 is connected with one end of dropping resistor R1, the positive pole of isolating diode D1 is connected with the positive pole of voltage-stabiliser tube Z1, the other end of dropping resistor R1 is connected with the input of zero line input and zero line N, described filter circuit comprises: low frequency filtering electric capacity C1 (usually by there being the electrochemical capacitor of polarity to form) and high-frequency filter capacitor C2, the anode of low frequency filtering electric capacity C1 and one end of high-frequency filter capacitor C2 are attempted by the negative pole of voltage-stabiliser tube Z1, the negative terminal of low frequency filtering electric capacity C1 and the other end of high-frequency filter capacitor C2 are attempted by the positive pole of voltage-stabiliser tube Z1, described starting switch S1 is connected in series in the input circuit of zero line N input, described bidirectional triode thyristor Q1 seals in the ac input circuit as the one-way communication motor M of single phase alternating current (A.C.) load, and the control end of bidirectional triode thyristor Q1 is by being connected (4, the 6 pin short circuits of microprocessor IC) with the current-limiting resistance R3 that this bidirectional triode thyristor Q1 matches with the PB2 pin (4 pin) of microprocessor IC with PB3 pin (6 pin), described synchronous signal circuit comprises: synchronous diode D2 and synchronous resistance R2, the positive pole of synchronous diode D2 is connected with one end of synchronous resistance R2, be connected with the PB0 pin (1 pin) of microprocessor IC as the output of synchronous signal circuit, the negative pole of synchronous diode D2 is connected with the input of live wire L, the other end of synchronous resistance R2 is connected with the input of zero line N, is connected to synchronous filtering electric capacity C3 between the output of described synchronous signal circuit and the ground wire of described power supply circuits, described control signal circuit comprises: a pair divider resistance R4 and R5, one end of divider resistance R4 with R5 is connected, as the output of described control signal circuit, the other end of divider resistance R4 is connected with the input of live wire L, and the other end of divider resistance R5 is connected with the earth terminal (positive pole of voltage-stabiliser tube Z1) of power supply circuits.
When practical application, also corresponding piezo-resistance VR1 can be met between the anode and negative electrode of described bidirectional triode thyristor Q1 as required.
The course of work of the present utility model is: press the linked switch be made up of starting switch S1 and control signal switch S 2, pressing in Cheng, starting switch S1 closes prior to control signal switch S 2, by dropping resistor R1, isolating diode D1, low frequency filtering electric capacity C1, the power supply circuits that high-frequency filter capacitor C2 and voltage-stabiliser tube Z1 is formed are powered to microprocessor IC, after power supply circuits normally work, control signal switch S 2 is just closed, at this moment, microprocessor IC detects that its 3 pin is by after " 1 " to " 0 " signal, microprocessor IC according to be connected on its 1 pin by synchronous resistance R2, the synchronizing signal that the synchronous circuit that synchronous diode D2 forms produces by its 4th, 6 pin export triggering signal, control the angle of flow of bidirectional triode thyristor Q1, it is made to increase gradually from small to large, to realize the soft start of load motor M.When grid cut-off, especially during abnormal power-down, after power-off, starting switch S1 and control signal switch S 2 do not disconnect, after power system restoration, microprocessor IC is owing to can not detect that its 3 pin is by " 1 " signal to " 0 ", microprocessor IC the 4th, 6 pin do not export triggering signal, bidirectional triode thyristor Q1 not conducting, load motor M does not operate, at this moment, only have and first disconnect linked switch, more again close, load motor M just can operate, the running of load motor M is among control all the time, efficiently avoid the generation of contingency.
In actual use, because control signal switch S 2 disconnects prior to starting switch S1, microprocessor IC detects that its 3 pin is by " 0 " to " 1 " signal, 4th, 6 pin of microprocessor IC stop exporting triggering signal, bidirectional triode thyristor Q1 ends, and after the main circuit current of load motor M1 runs out of, starting switch S1 just disconnects, thus avoid starting switch S1 contact generation phenomenon of arc discharge, thus the useful life of starting switch S1 can be extended.
In sum, be only preferred embodiment of the present utility model, not be used for limit the utility model implement scope, all equalizations done according to shape, structure, feature and the spirit described in the utility model right change and modify, and all should be included in right of the present utility model.
Claims (8)
1. the starting protection circuit of a single phase alternating current (A.C.) load, comprise: starting switch, it is characterized in that, the starting protection circuit of described single phase alternating current (A.C.) load also includes: microprocessor, the power supply circuits of power supply are provided to microprocessor, control signal circuit, controllable electronic switch, synchronous signal circuit, and the control signal switch to link with starting switch, described starting switch is prior to control signal switch connection, after disconnect in control signal switch, one end of control signal switch is connected with the output of control signal circuit, the other end of control signal switch is connected with the respective input of microprocessor, described power supply circuits are provided with a pair for connecting the ac input end of single phase alternating current power supply, described starting switch is connected in series in the input circuit of one of them ac input end, described controllable electronic switch seals in the ac input circuit of described single phase alternating current (A.C.) load, the control end of controllable electronic switch is by being connected with the corresponding output end of microprocessor with the current-limiting resistance that this controllable electronic switch matches, a pair input of described synchronous signal circuit is connected with a pair described ac input end one_to_one corresponding, and the output of synchronous signal circuit is connected with the respective input of microprocessor.
2. the starting protection circuit of single phase alternating current (A.C.) load as claimed in claim 1; it is characterized in that: described power supply circuits comprise: filter circuit, voltage-stabiliser tube, isolating diode and dropping resistor; the negative pole of voltage-stabiliser tube is connected with the live wire input in a pair ac input end, as the power end of power supply circuits; the positive pole of voltage-stabiliser tube as power supply circuits earth terminal and be connected with the zero line input in a pair ac input end with dropping resistor by the isolating diode be serially connected, described filter circuit is attempted by described voltage-stabiliser tube.
3. the starting protection circuit of single phase alternating current (A.C.) load as claimed in claim 2, is characterized in that: described filter circuit comprises: at least one high-frequency filter capacitor and at least one low frequency filtering electric capacity.
4. the starting protection circuit of single phase alternating current (A.C.) load as claimed in claim 1; it is characterized in that: described synchronous signal circuit comprises: synchronous diode and synchronous resistance; the positive pole of synchronous diode is connected with one end of synchronous resistance, as the output of synchronous signal circuit; the negative pole of synchronous diode is connected with live wire input, and the other end of synchronous resistance is connected with zero line input.
5. the starting protection circuit of single phase alternating current (A.C.) load as claimed in claim 4, is characterized in that: be connected to synchronous filtering electric capacity between the output of described synchronous signal circuit and the ground wire of power supply circuits.
6. the starting protection circuit of single phase alternating current (A.C.) load as claimed in claim 1; it is characterized in that: described controllable electronic switch is bidirectional triode thyristor; the anode of bidirectional triode thyristor is connected with live wire input, and the negative electrode of bidirectional triode thyristor is connected to the respective input of single phase alternating current (A.C.) load.
7. the starting protection circuit of single phase alternating current (A.C.) load as claimed in claim 6, is characterized in that: be connected to piezo-resistance between the anode of described bidirectional triode thyristor and negative electrode.
8. the starting protection circuit of the single phase alternating current (A.C.) load as described in one of claim 1 to 7; it is characterized in that: described control signal circuit comprises: a pair divider resistance; this is connected to one end of divider resistance, as the output of described control signal circuit, this is connected with the earth terminal of power supply circuits with live wire input respectively to the other end of divider resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520984148.3U CN205232068U (en) | 2015-12-02 | 2015-12-02 | Starting protection circuit of single phase alternating current load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520984148.3U CN205232068U (en) | 2015-12-02 | 2015-12-02 | Starting protection circuit of single phase alternating current load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205232068U true CN205232068U (en) | 2016-05-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520984148.3U Withdrawn - After Issue CN205232068U (en) | 2015-12-02 | 2015-12-02 | Starting protection circuit of single phase alternating current load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205232068U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406771A (en) * | 2015-12-02 | 2016-03-16 | 张家港华捷电子有限公司 | Starting protection circuit of single-phase AC load |
-
2015
- 2015-12-02 CN CN201520984148.3U patent/CN205232068U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406771A (en) * | 2015-12-02 | 2016-03-16 | 张家港华捷电子有限公司 | Starting protection circuit of single-phase AC load |
| CN105406771B (en) * | 2015-12-02 | 2018-04-20 | 张家港华捷电子有限公司 | A kind of single phase ac Fu starting protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160511 Effective date of abandoning: 20180420 |