CN103700542A - Relay action response and delay detection circuit, circuit board and electric heating product containing thereof - Google Patents
Relay action response and delay detection circuit, circuit board and electric heating product containing thereof Download PDFInfo
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- CN103700542A CN103700542A CN201310700132.0A CN201310700132A CN103700542A CN 103700542 A CN103700542 A CN 103700542A CN 201310700132 A CN201310700132 A CN 201310700132A CN 103700542 A CN103700542 A CN 103700542A
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Abstract
The invention discloses a relay action response and delay detection circuit, a circuit board and an electric heating product containing thereof. The relay action response and delay detection circuit comprises a power supply, a zero-crossing detection loop, a relay, a voltage detection loop, and a load, wherein the input end of the zero-crossing detection loop is connected with the power supply, the output end of the zero-crossing detection loop is connected with a zero-crossing signal detection terminal ZERO of a control chip, one end of the relay is connected with the power supply, the other end of the relay is connected with the input end of the voltage detection loop, the output end of the voltage detection loop is connected with a voltage detection signal input terminal AD-V of the control chip, one end of the load is connected with the power supply, and the other end of the load is connected with the input end of the voltage detection loop. The detection circuit has the advantages that the detected real-time wave-shaped voltage is not the equivalent voltage, and the structure of the circuit is simple; by combining two circuits, the functions of voltage detection, zero-crossing detection, relay response state detection, relay action delay detection, and the like can be realized.
Description
Technical field
The present invention relates to cooking apparatus technical field, in particular to a kind of actuating of relay response and delay detection circuit, circuit board and electric heating products thereof.
Background technology
Domestic electric heating product adopts heating wire to heat object conventionally, but at present, owing to being subject to the impact of change in voltage, for example the variation of described voltage is from the power disturbance in electric power transfer process, adopt these domestic electric heating products of heating wire heating cannot accomplish accurate power control, current, in order to solve the problem of change in voltage, in industry, existing researcher has proposed first input voltage to be carried out to step-down, by bleeder circuit, separate part voltage signal afterwards, again by carrying out voltage detecting after filter circuit, but this voltage detecting circuit is comparatively complicated, its required device is many, can cause on the one hand manufacturing cost to improve, second strengthened the difficulty of board design.
In addition, when household electrical appliances electric heating products will be realized the functions such as voltage detecting, zero passage detection, the detection of relay responsive state, actuating of relay delay detection simultaneously, it realizes circuit complexity, and the during the design time is longer, causes easily affecting the promptness of product design and the reliability of product.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the present invention is to provide a kind of actuating of relay response and delay detection circuit, circuit board and electric heating products thereof.
The present invention realizes by the following technical solutions:
Actuating of relay response and a delay detection circuit, it comprises:
Power supply;
Zero passage detection loop, its input is connected to power supply, and its output is connected with the zero cross signal detection terminal ZERO of control chip;
Relay, its one end is connected to power supply, and the other end is connected with the input in voltage detecting loop;
Voltage detecting loop, its output is connected with the voltage detection signal input terminal AD-V of control chip;
Load, its one end is connected to power supply, and the other end is connected to the input in voltage detecting loop.
Preferably, described voltage detecting circuit, comprise diode D3, resistance R 1, resistance R 2, parallel with one another and one is held the capacitor C 1 of ground connection jointly, resistance R 3, diode D4 and the series connection group being formed by resistance R 4 and capacitor C 2, with and negative electrode be connected to the diode D5 that high level and its anode are connected with the negative electrode of described diode D4, wherein, the anodic bonding of diode D3 is to relay, its negative electrode is connected with resistance R 1, the other end of resistance R 1 is connected with resistance R 2, the other end of resistance R 2 is connected with another common end of described parallel circuits, the anode of described diode D3 is connected with the output of relay circuit, the plus earth of described diode D4, one end being connected of described resistance R 4 and capacitor C 2 is connected to the voltage detection signal input terminal AD-V of control chip.
Preferably, described actuating of relay response and delay detection circuit also comprise the relay circuit being connected with described relay, described relay circuit comprises that its negative electrode is connected to respectively the diode D1 of the collector electrode of triode Q2 and the first electromagnetism end of relay K 1, the anodic bonding of the anode of diode D1 and diode D2, the negative electrode of diode D2 is connected with the second electromagnetism end of relay K 1 and the collector electrode of triode Q1 respectively, the base stage of triode Q1 is connected with signal terminal HBOT and passes through resistance R 5 ground connection, grounded emitter at described triode Q1, the emitter of triode Q2 connects high level and is connected to one end of resistance R 7, its base stage is connected to the other end of resistance R 7 and is connected with the collector electrode of triode Q3, the grounded emitter of triode Q3, its base stage is connected with signal terminal PULSE by resistance R 6 ground connection and by capacitor C 3.
Preferably, described zero cross detection circuit, comprise resistance R 8-R12, diode D6 and D7, capacitor C 4 and C5, and triode Q4, one end of described resistance R 8 is electrically connected to city, its other end is connected to the base stage of described triode Q4, described diode D6 is in parallel with resistance R 9, and the negative electrode of described diode D6 is connected to high level, its anodic bonding is to the base stage of described triode Q4 and one end of described capacitor C 4, the other end ground connection of capacitor C 4 is also connected with a common end of resistance R 11 parallel with one another and capacitor C 5, the emitter of described triode Q4 connects high level, its collector electrode is connected with the other end of described resistance R 11 by resistance R 10, the other end of described resistance R 11 is also connected to high level by described diode D7, the negative electrode of described diode D7 connects high level, the other end of described capacitor C 5 is connected with resistance R 12 and zero cross signal detection terminal ZERO connects, the other end of described resistance R 12 is connected to the anode of diode D7.
A circuit board, it comprises:
Voltage protection circuit;
Interchange turns direct current AC/DC circuit;
DC-DC DC/DC circuit;
And, actuating of relay response and delay detection circuit as mentioned above, described circuit comprises:
Power supply;
Zero passage detection loop, its input is connected to power supply, and its output is connected with the zero cross signal detection terminal ZERO of control chip;
Relay, its one end is connected to power supply, and the other end is connected with the input in voltage detecting loop;
Voltage detecting loop, its output is connected with the voltage detection signal input terminal AD-V of control chip;
Load, its one end is connected to power supply, and the other end is connected to the input in voltage detecting loop.
An electric heating products, it comprises circuit board as above, described circuit board comprises:
Voltage protection circuit;
Interchange turns direct current AC/DC circuit;
DC-DC DC/DC circuit;
And, actuating of relay response and delay detection circuit as mentioned above, described circuit comprises:
Power supply;
Zero passage detection loop, its input is connected to power supply, and its output is connected with the zero cross signal detection terminal ZERO of control chip;
Relay, its one end is connected to power supply, and the other end is connected with the input in voltage detecting loop;
Voltage detecting loop, its output is connected with the voltage detection signal input terminal AD-V of control chip;
Load, its one end is connected to power supply, and the other end is connected to the input in voltage detecting loop.
Adopt actuating of relay response provided by the invention and delay detection circuit, it has simplified voltage detecting circuit, and is combined with zero crossing circuitry.By adopting two modes that combine of zero passage and voltage detecting, and by software control, realize the detection of sine voltage, on the one hand, the real-time waveform voltage of its detection is not equivalent voltage, and on the other hand, the circuit structure of this circuit is simple, only, with two circuit combinations, just can realize the functions such as voltage detecting, zero passage detection, the detection of relay responsive state, actuating of relay delay detection.
Accompanying drawing explanation
Fig. 1 is a kind of actuating of relay response of providing of the embodiment of the present invention and the electrical block diagram of delay detection circuit.
Fig. 2 is the voltage detecting loop that provides of the embodiment of the present invention and the circuit diagram of relay circuit.
Fig. 3 is the circuit diagram of the zero cross detection circuit that provides of the embodiment of the present invention.
The realization of the object of the invention, functional characteristics and excellent effect, be described further below in conjunction with specific embodiment and accompanying drawing.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in further detail, so that those skilled in the art can better understand the present invention also, can be implemented, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, Figure 2, Figure 3 shows, a kind of actuating of relay response and delay detection circuit that the embodiment of the present invention provides, it comprises:
Zero passage detection loop 50, its input is connected to power supply 30, and its output is connected with the zero cross signal detection terminal ZERO of control chip 40;
As shown in Figure 2, described power supply 30 can be civil power, and described load can be heater, and one end of described heater is connected to civil power live wire ACL, its other end is connected to civil power zero line ACN by relay circuit 10.
Described voltage detecting circuit 20, comprise diode D3, resistance R 1, resistance R 2, parallel with one another and one is held the capacitor C 1 of ground connection jointly, resistance R 3, diode D4 and the series connection group being formed by resistance R 4 and capacitor C 2, with and negative electrode be connected to the diode D5 that high level and its anode are connected with the negative electrode of described diode D4, wherein, the anodic bonding of diode D3 is to relay 70, its negative electrode is connected with resistance R 1, the other end of resistance R 1 is connected with resistance R 2, the other end of resistance R 2 is connected with another common end of described parallel circuits, the anode of described diode D3 is connected with the output of relay circuit 10, the plus earth of described diode D4, one end being connected of described resistance R 4 and capacitor C 2 is connected to the voltage detection signal input terminal AD-V of control chip 40.
Described actuating of relay response and delay detection circuit also comprise the relay circuit 10 being connected with relay 70, particularly, shown in figure 2, one end of described relay K 1 is connected to civil power zero line CAN, its other end is connected to the input in voltage detecting loop 20, described relay circuit 10 comprises that its negative electrode is connected to respectively the diode D1 of the collector electrode of triode Q2 and the first electromagnetism end of relay K 1, the anodic bonding of the anode of diode D1 and diode D2, the negative electrode of diode D2 is connected with the second electromagnetism end of relay K 1 and the collector electrode of triode Q1 respectively, the base stage of triode Q1 is connected with signal terminal HBOT and passes through resistance R 5 ground connection, the grounded emitter of described triode Q1, the emitter of triode Q2 connects high level and is connected to one end of resistance R 7, its base stage is connected to the other end of resistance R 7 and is connected with the collector electrode of triode Q3, the grounded emitter of triode Q3, its base stage is connected with signal terminal PULSE by resistance R 6 ground connection and by capacitor C 3.
Described in figure 3, described zero cross detection circuit, comprise resistance R 8-R12, diode D6 and D7, capacitor C 4 and C5, and triode Q4, one end of described resistance R 8 is electrically connected to city, its other end is connected to the base stage of described triode Q4, described diode D6 is in parallel with resistance R 9, and the negative electrode of described diode D6 is connected to high level, its anodic bonding is to the base stage of described triode Q4 and one end of described capacitor C 4, the other end ground connection of capacitor C 4 is also connected with a common end of resistance R 11 parallel with one another and capacitor C 5, the emitter of described triode Q4 connects high level, its collector electrode is connected with the other end of described resistance R 11 by resistance R 10, the other end of described resistance R 11 is also connected to high level by described diode D7, the negative electrode of described diode D7 connects high level, the other end of described capacitor C 5 is connected with resistance R 12 and zero cross signal detection terminal ZERO connects, the other end of described resistance R 12 is connected to the anode of diode D7.
The following describes actuating of relay response that lower the present embodiment provides and the operation principle of delay detection circuit.
1, zero cross detection circuit detecting zero crossing, and detect mains frequency f.
2, confirm inhibit signal t time of delay after measuring mains frequency f.
3, after zero crossing time of delay t, in relay K 1, do not start to start the voltage detecting of AD-V port in adhesive
4, the inspection ADv that averages after n time.
5, according to the size of ADv, and frequency f, then from default form, calculate current voltage.
6, the frequency of voltage detecting can be real-time detection, also can detect once every a period of time, so far completes voltage detecting.
When 7, need to open relay K 1, the action that front action is several times used for detecting relay K 1 postpones.
8, there is relay K 1 adhesive request, detect zero cross signal simultaneously, relay circuit 10 output signals, control relay K1 adhesive, simultaneously, voltage detecting circuit 20 starts every 1ms(or 500us) detection voltage AD value, continuous detecting 10 times, can detect the moment that voltage can't check suddenly, calculates and sends control signal to the time difference of loss of voltage from relay circuit 10, the adhesive time of delay that is relay K 1, be defined as t1.
9,, according to the frequency f detecting before, if 50Hz, the theoretical control lag of action of relay K 1 is 10ms-t1; If 60Hz, the theoretical control lag of action of relay K 1 is 8.3ms-t1.
10, in like manner, detect relay switch K and decontrol when postponing, the control signal of relay circuit 10 outputs disconnected at zero point, simultaneously, voltage detecting circuit 20 starts every 1ms(or 500us) detect voltage AD value, continuous detecting 10 times, can detect the moment that voltage detects suddenly.This is relay K 1 hang-over delay, is defined as t2.
Control time while 11, in like manner calculating relay K 1 release.If 50Hz, the theoretical control lag of action of relay K 1 is 10ms-t2; If 60Hz, the theoretical control lag of action of relay is 8.3ms-t2.
12, relay K 1 action postpones, and detect once, or the operation 1000 times (recommendations) of cooking detects once during each initialization.
13. for guaranteeing the effect of zero passage break-make, that is, action completed before zero crossing, the adhesive that previous calculations goes out and release time, need to shift to an earlier date slightly 1ms
14, the 3rd of this circuit the effect, be the action situation fault whether that detects relay K 1, based on relay K 1 adhesive and release, at voltage detecting circuit 20, can find corresponding relation, while being relay K 1 release, can detect voltage, during relay K 1 adhesive, can't check voltage, therefore, whether can judge relay K 1 carries out consistent with control signal, if there is relay K 1, send adhesive signal, but still can detect voltage, illustrate that relay K 1 cannot adhesive; Or relay K 1 is sent release signal, but still can't check voltage, illustrate that relay K 1 cannot discharge.Need to send information warning, or do relay K 1 action and repair.
It should be noted that time of delay, t was in order to catch sinusoidal wave crest or approach the position of crest after zero crossing.
The embodiment of the present invention also provides a kind of circuit board, and it comprises:
Voltage protection circuit;
Interchange turns direct current AC/DC circuit;
DC-DC DC/DC circuit;
And, actuating of relay response and delay detection circuit as mentioned above, with reference to figure 1, described circuit comprises:
Zero passage detection loop 50, its input is connected to power supply 30, and its output is connected with the zero cross signal detection terminal ZERO of control chip 40;
Shown in figure 2, described voltage detecting circuit 20, comprise diode D3, resistance R 1, resistance R 2, parallel with one another and one is held the capacitor C 1 of ground connection jointly, resistance R 3, diode D4 and the series connection group being formed by resistance R 4 and capacitor C 2, with and negative electrode be connected to the diode D5 that high level and its anode are connected with the negative electrode of described diode D4, wherein, the anodic bonding of diode D3 is to relay 70, its negative electrode is connected with resistance R 1, the other end of resistance R 1 is connected with resistance R 2, the other end of resistance R 2 is connected with another common end of described parallel circuits, the anode of described diode D3 is connected with the output of relay circuit 10, the plus earth of described diode D4, one end being connected of described resistance R 4 and capacitor C 2 is connected to the voltage detection signal input terminal AD-V of control chip 40.
Described actuating of relay response and delay detection circuit also comprise the relay circuit 10 being connected with relay 70, particularly, shown in figure 2, one end of described relay K 1 is connected to civil power zero line CAN, its other end is connected to the input in voltage detecting loop 20, described relay circuit 10 comprises that its negative electrode is connected to respectively the diode D1 of the collector electrode of triode Q2 and the first electromagnetism end of relay K 1, the anodic bonding of the anode of diode D1 and diode D2, the negative electrode of diode D2 is connected with the second electromagnetism end of relay K 1 and the collector electrode of triode Q1 respectively, the base stage of triode Q1 is connected with signal terminal HBOT and passes through resistance R 5 ground connection, grounded emitter at described triode Q1, the emitter of triode Q2 connects high level and is connected to one end of resistance R 7, its base stage is connected to the other end of resistance R 7 and is connected with the collector electrode of triode Q3, the grounded emitter of triode Q3, its base stage is connected with signal terminal PULSE by resistance R 6 ground connection and by capacitor C 3.
More specifically, with reference to figure 3, described zero cross detection circuit, comprise resistance R 8-R12, diode D6 and D7, capacitor C 4 and C5, and triode Q4, one end of described resistance R 8 is electrically connected to city, its other end is connected to the base stage of described triode Q4, described diode D6 is in parallel with resistance R 9, and the negative electrode of described diode D6 is connected to high level, its anodic bonding is to the base stage of described triode Q4 and one end of described capacitor C 4, the other end ground connection of capacitor C 4 is also connected with a common end of resistance R 11 parallel with one another and capacitor C 5, the emitter of described triode Q4 connects high level, its collector electrode is connected with the other end of described resistance R 11 by resistance R 10, the other end of described resistance R 11 is also connected to high level by described diode D7, the negative electrode of described diode D7 connects high level, the other end of described capacitor C 5 is connected with resistance R 12 and zero cross signal detection terminal ZERO connects, the other end of described resistance R 12 is connected to the anode of diode D7.
The embodiment of the present invention also provides a kind of electric heating products, and it comprises circuit board as above, and described circuit board comprises:
Voltage protection circuit;
Interchange turns direct current AC/DC circuit;
DC-DC DC/DC circuit;
And, actuating of relay response and delay detection circuit as mentioned above, with reference to figure 1, described circuit comprises:
Zero passage detection loop 50, its input is connected to power supply 30, and its output is connected with the zero cross signal detection terminal ZERO of control chip 40;
Continuation is with reference to figure 2, described voltage detecting circuit 20, comprise diode D3, resistance R 1, resistance R 2, parallel with one another and one is held the capacitor C 1 of ground connection jointly, resistance R 3, diode D4 and the series connection group being formed by resistance R 4 and capacitor C 2, with and negative electrode be connected to the diode D5 that high level and its anode are connected with the negative electrode of described diode D4, wherein, the anodic bonding of diode D3 is to relay 70, its negative electrode is connected with resistance R 1, the other end of resistance R 1 is connected with resistance R 2, the other end of resistance R 2 is connected with another common end of described parallel circuits, the anode of described diode D3 is connected with the output of relay circuit 10, the plus earth of described diode D4, one end being connected of described resistance R 4 and capacitor C 2 is connected to the voltage detection signal input terminal AD-V of control chip 40.
Continuation is with reference to figure 2, the described relay 70(K1 as shown in FIG. that is connected to) relay circuit 10, comprise that its negative electrode is connected to respectively the diode D1 of the collector electrode of triode Q2 and the first electromagnetism end of relay K 1, the anodic bonding of the anode of diode D1 and diode D2, the negative electrode of diode D2 is connected with the second electromagnetism end of relay K 1 and the collector electrode of triode Q1 respectively, the base stage of triode Q1 is connected with signal terminal HBOT and passes through resistance R 5 ground connection, grounded emitter at described triode Q1, the emitter of triode Q2 connects high level and is connected to one end of resistance R 7, its base stage is connected to the other end of resistance R 7 and is connected with the collector electrode of triode Q3, the grounded emitter of triode Q3, its base stage is connected with signal terminal PULSE by resistance R 6 ground connection and by capacitor C 3.
Continuation is with reference to figure 3, described zero cross detection circuit, comprise resistance R 8-R12, diode D6 and D7, capacitor C 4 and C5, and triode Q4, one end of described resistance R 8 is electrically connected to city, its other end is connected to the base stage of described triode Q4, described diode D6 is in parallel with resistance R 9, and the negative electrode of described diode D6 is connected to high level, its anodic bonding is to the base stage of described triode Q4 and one end of described capacitor C 4, the other end ground connection of capacitor C 4 is also connected with a common end of resistance R 11 parallel with one another and capacitor C 5, the emitter of described triode Q4 connects high level, its collector electrode is connected with the other end of described resistance R 11 by resistance R 10, the other end of described resistance R 11 is also connected to high level by described diode D7, the negative electrode of described diode D7 connects high level, the other end of described capacitor C 5 is connected with resistance R 12 and zero cross signal detection terminal ZERO connects, the other end of described resistance R 12 is connected to the anode of diode D7.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (6)
1. actuating of relay response and a delay detection circuit, is characterized in that, comprising:
Power supply;
Zero passage detection loop, its input is connected to power supply, and its output is connected with the zero cross signal detection terminal ZERO of control chip;
Relay, its one end is connected to power supply, and the other end is connected with the input in voltage detecting loop;
Voltage detecting loop, its output is connected with the voltage detection signal input terminal AD-V of control chip;
Load, its one end is connected to power supply, and the other end is connected to the input in voltage detecting loop.
2. actuating of relay response as claimed in claim 1 and delay detection circuit, it is characterized in that, described voltage detecting circuit, comprise diode D3, resistance R 1, resistance R 2, parallel with one another and one is held the capacitor C 1 of ground connection jointly, resistance R 3, diode D4 and the series connection group being formed by resistance R 4 and capacitor C 2, with and negative electrode be connected to the diode D5 that high level and its anode are connected with the negative electrode of described diode D4, wherein, the anodic bonding of diode D3 is to relay, its negative electrode is connected with resistance R 1, the other end of resistance R 1 is connected with resistance R 2, the other end of resistance R 2 is connected with another common end of described parallel circuits, the anode of described diode D3 is connected with the output of relay circuit, the plus earth of described diode D4, one end being connected of described resistance R 4 and capacitor C 2 is connected to the voltage detection signal input terminal AD-V of control chip.
3. actuating of relay response as claimed in claim 1 and delay detection circuit, it is characterized in that, also comprise the relay circuit being connected with described relay, described relay circuit comprises that its negative electrode is connected to respectively the diode D1 of the collector electrode of triode Q2 and the first electromagnetism end of relay K 1, the anodic bonding of the anode of diode D1 and diode D2, the negative electrode of diode D2 is connected with the second electromagnetism end of relay K 1 and the collector electrode of triode Q1 respectively, the base stage of triode Q1 is connected with signal terminal HBOT and passes through resistance R 5 ground connection, grounded emitter at described triode Q1, the emitter of triode Q2 connects high level and is connected to one end of resistance R 7, its base stage is connected to the other end of resistance R 7 and is connected with the collector electrode of triode Q3, the grounded emitter of triode Q3, its base stage is connected with signal terminal PULSE by resistance R 6 ground connection and by capacitor C 3.
4. actuating of relay response as claimed in claim 1 and delay detection circuit, it is characterized in that, described zero cross detection circuit, comprise resistance R 8-R12, diode D6 and D7, capacitor C 4 and C5, and triode Q4, one end of described resistance R 8 is electrically connected to city, its other end is connected to the base stage of described triode Q4, described diode D6 is in parallel with resistance R 9, and the negative electrode of described diode D6 is connected to high level, its anodic bonding is to the base stage of described triode Q4 and one end of described capacitor C 4, the other end ground connection of capacitor C 4 is also connected with a common end of resistance R 11 parallel with one another and capacitor C 5, the emitter of described triode Q4 connects high level, its collector electrode is connected with the other end of described resistance R 11 by resistance R 10, the other end of described resistance R 11 is also connected to high level by described diode D7, the negative electrode of described diode D7 connects high level, the other end of described capacitor C 5 is connected with resistance R 12 and zero cross signal detection terminal ZERO connects, the other end of described resistance R 12 is connected to the anode of diode D7.
5. a circuit board, is characterized in that, comprising:
Voltage protection circuit;
Interchange turns direct current AC/DC circuit;
DC-DC DC/DC circuit;
And, actuating of relay response and delay detection circuit as described in claim 1-4 any one.
6. an electric heating products, is characterized in that, comprises circuit board as claimed in claim 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310700132.0A CN103700542B (en) | 2013-12-18 | 2013-12-18 | Actuating of relay response and delay detection circuit, circuit board and there is its electric heating products |
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| CN201310700132.0A CN103700542B (en) | 2013-12-18 | 2013-12-18 | Actuating of relay response and delay detection circuit, circuit board and there is its electric heating products |
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| CN104898405A (en) * | 2015-05-22 | 2015-09-09 | 江苏固德威电源科技有限公司 | Relay closing moment detecting method |
| CN105242728A (en) * | 2015-10-28 | 2016-01-13 | 小米科技有限责任公司 | Method and device controlling power on/off of intelligent socket, and the intelligent socket |
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| CN108962677A (en) * | 2018-07-11 | 2018-12-07 | 深圳拓邦股份有限公司 | A kind of means of relay controlling, system and relay |
| CN109743048A (en) * | 2018-12-27 | 2019-05-10 | Tcl通力电子（惠州）有限公司 | Relay zero-crossing point trigger circuit, method and device |
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