CN103533717B - Based on electronic equipment and the control method thereof of direct current supply communication - Google Patents
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Abstract
The present invention discloses a kind of electronic equipment based on direct current supply communication and control method thereof, this electronic equipment comprises power supply and controlled device, power supply comprises power transfer module, on-off switch and modulation module, controlled device comprises demodulation control module, driver module and load, and power transfer module, modulation module are connected with on-off switch; Demodulation control module, load are connected with driver module; On-off switch is also connected with driver module through power line, demodulation control module connecting power line; Controlled the make-and-break time of on-off switch according to the remote control command of outside by modulation module, thus according to described make-and-break time, described remote control command is modulated into corresponding control signal, sent by power line, carry out control signal described in demodulation by demodulation control module according to make-and-break time again, thus control driver module to the adjustment of load operating condition.Structure of the present invention is simple, can adjust the operating state of load accurately.
Description
Technical field
The present invention relates to the electronic equipment control field adopting DC power supply, particularly relate to a kind of electronic equipment based on direct current supply communication and control method thereof.
Background technology
Along with the development of lighting technology, LED(LightEmittingDiode, light-emitting diode) illuminating product due to the adjustment of brightness or colour temperature can be carried out easily, progressively substitute traditional Halogen lamp LED and CFL lighting product.
At present, in LED illumination product with MR16 shot-light for main representative, the formation of this type of illuminating product is generally made up of power transformer and shot-light.220V civil power is converted to the high-frequency ac power of 12V by power transformer, drives MR16 shot-light luminous by the 12V high-frequency ac power be converted to.For the MR16 shot-light having light modulation demand, controlled by traditional controllable silicon light modulation mode in prior art, the power supply of system and dimming mode have still continued to use traditional electronic transformer and controllable silicon light modulation mode, this silicon controlled dimming mode is equivalent to have adjusted the voltage of powering to MR16 shot-light, shot-light is inner, and by corresponding circuit, by the drive current of LED, input voltage is corresponding therewith again, thus realizes brightness adjustment control.Like this, the circuit of MR16 shot-light inside is very complicated, causes cost higher and is difficult to realize miniaturization, in addition, by the supply power voltage of adjustment MR16 shot-light, the operating state that control cannot adjust MR16 shot-light is accurately carried out to it, and cannot more complicated control be carried out.
Summary of the invention
Main purpose of the present invention is to provide a kind of structure simple and can carries out the electronic equipment based on direct current supply communication and the control method thereof of accurately control to load.
In order to achieve the above object, the present invention proposes a kind of electronic equipment based on direct current supply communication, comprise power supply and controlled device, described power supply comprises power transfer module, on-off switch and modulation module, described controlled device comprises demodulation control module, driver module and load, wherein:
Described power transfer module is connected with described on-off switch with modulation module;
Described demodulation control module is connected with described driver module with described load;
Described on-off switch is also connected with described driver module through power line, and described demodulation control module connects described power line;
Described power transfer module is used for civil power to be converted to DC power supply, and described DC power supply exports described driver module to through described on-off switch and power line, for described driver module is powered;
Described on-off switch is for controlling the break-make of described DC power supply;
Described modulation module for receiving outside remote control command, and modulates according to described remote control command the make-and-break time that corresponding control signal controls described on-off switch;
The make-and-break time that described demodulation control module is used for by detecting DC power supply described in power line carrys out control signal described in demodulation, and described control signal is converted to corresponding drive singal is sent to described driver module;
Described driver module is used for the operating state controlling described load according to described drive singal.
Preferably, described controlled device is LED lamp, and described load is LED.
Preferably, the positive pole of described DC power supply is connected with described driver module, the minus earth of described DC power supply, described on-off switch is field effect transistor, the grid of described field effect transistor is connected with described modulation module, the drain electrode of described field effect transistor is connected with described driver module, the source ground of described field effect transistor.
Preferably, described modulation module is first microprocessor, described first microprocessor and external remote control equipment connection, to receive outside remote control command, described first microprocessor is also connected with the grid of described field effect transistor, to modulate according to described remote control command the make-and-break time that corresponding control signal controls described on-off switch.
Preferably, described driver module comprises polarization converting unit and LED drive unit, described polarization converting unit is connected with described on-off switch and described LED drive unit, for the polarity of the DC power supply exporting described driver module to is fixed, described LED drive unit is connected with described LED, works for controlling described LED.
Preferably, described polarization converting unit comprises full-bridge rectification bridge and storage capacitor, the ac input end of described full-bridge rectification bridge is connected with the positive pole of described DC power supply and the drain electrode of described field effect transistor respectively, the DC output end of described full-bridge rectification bridge is connected with described LED drive unit, between the DC output end that one end of described storage capacitor is connected to described full-bridge rectification bridge and described LED drive unit, the other end ground connection of described storage capacitor, described storage capacitor is used for when described on-off switch turns off for described LED drive unit provides the electric energy being enough to make described LED normally work.
Preferably, described demodulation control module comprises the first diode, second diode, first resistance, second resistance, voltage stabilizing didoe and the second microprocessor, the anode of described first diode, the anode of described second diode is connected with the ac input end of described full-bridge rectification bridge respectively, the negative electrode of described first diode is connected with described second microprocessor through described first resistance after being connected with the negative electrode of described second diode, described second resistance one end is connected with the negative electrode of described first diode, described second resistance other end ground connection, the negative electrode of described voltage stabilizing didoe is connected with described second microprocessor, the plus earth of described voltage stabilizing didoe, described second microprocessor is also connected with described LED drive unit.
The present invention also proposes a kind of control method of the electronic equipment based on direct current supply communication, comprising:
Civil power is converted to DC power supply by modular converter, and described DC power supply exports driver module to through on-off switch and power line, for described driver module is powered;
Modulation module receives outside remote control command, and modulates according to described remote control command the make-and-break time that corresponding control signal controls on-off switch;
Demodulation control module carrys out control signal described in demodulation by detecting the make-and-break time of DC power supply in power line, and described control signal is converted to corresponding drive singal is sent to driver module;
Driver module is according to the operating state of described drive singal control load.
Preferably, describedly modulate according to described remote control command the step that corresponding control signal controls the make-and-break time of on-off switch and comprise:
Modulate corresponding control signal control on-off switch according to described remote control command and carry out interval shutoff operation with the fixing turn-off time;
ON time between twice shutoff is calculated after conversion as corresponding control signal.
Preferably, described remote control command controls in the make-and-break time of on-off switch, and the ON time preset value larger than the described fixing turn-off time of on-off switch, described preset value is more than 5 times of the described fixing turn-off time.
A kind of electronic equipment based on direct current supply communication that the present invention proposes and control method thereof, controlled the make-and-break time of on-off switch according to the remote control command of outside by modulation module, thus according to described make-and-break time, described remote control command is modulated into corresponding control signal, sent by power line, control signal described in demodulation is carried out according to make-and-break time again by demodulation control module, thus control driver module to the adjustment of load operating condition, owing to only need carry out controlling to send out complicated control signal to the make-and-break time of on-off switch, and only need be sent to driver module by power line together with input power, structure is very simple, the operating state of load can be adjusted accurately, in addition, different control signals according to sending can carry out various control to the operating state of load, very practical.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the electronic equipment that present pre-ferred embodiments communicates based on direct current supply;
Fig. 2 is the circuit diagram of the electronic equipment that present pre-ferred embodiments communicates based on direct current supply.
In order to make technical scheme of the present invention clearly, understand, be described in further detail below in conjunction with accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
With reference to the structured flowchart that Fig. 1, Fig. 1 are the electronic equipments that present pre-ferred embodiments communicates based on direct current supply.
Present pre-ferred embodiments proposes a kind of electronic equipment based on direct current supply communication, comprise power supply A and controlled device B, described power supply A comprises power transfer module 1, on-off switch 2 and modulation module 3, described controlled device B comprises demodulation control module 4, driver module 5 and load, it should be noted that, controlled device B in the present embodiment can be and to be anyly connected with power supply A by means of only power line and to have the controlled device of data transfer demands, for convenience of explanation, below be only LED lamp with controlled device for example is specifically described, certainly, also not limiting controlled device is other types, the principle of other types controlled device can refer to the operation principle of LED lamp, do not repeat them here.When controlled device B is LED lamp, then load is LED, wherein:
Described power transfer module 1 is connected with described on-off switch 2 with modulation module 3; Described demodulation control module 4 is connected with described driver module 5 with described LED; Described on-off switch 2 is also connected with described driver module 5 through power line, and described demodulation control module 4 connects described power line; Described power transfer module 1 is for being converted to DC power supply by civil power, and described DC power supply exports described driver module 5 to through described on-off switch 2, for described driver module 5 is powered;
Described on-off switch 2 is for controlling the break-make of described DC power supply; Described modulation module 3 for receiving outside remote control command, and modulates according to described remote control command the make-and-break time that corresponding control signal controls described on-off switch 2; Described demodulation control module 4 carrys out control signal described in demodulation for the make-and-break time by detecting DC power supply described in power line, and described control signal is converted to corresponding drive singal and is sent to described driver module 5; Described driver module 5 is for controlling the operating state of described LED according to described drive singal.
With reference to the circuit diagram that Fig. 2, Fig. 2 are the electronic equipments that present pre-ferred embodiments communicates based on direct current supply.
The positive pole 11 of described DC power supply is connected with described driver module 5, negative pole 12 ground connection of described DC power supply.Described on-off switch 2 is field effect transistor 21, and the grid G of described field effect transistor 21 is connected with described modulation module 3, and the drain D of described field effect transistor 21 is connected with described driver module 5, the source S ground connection of described field effect transistor 21.
Wherein, described modulation module 3 is first microprocessor 31, described first microprocessor 31 and external remote control equipment connection, to receive outside remote control command, described first microprocessor 31 is also connected with the grid G of described field effect transistor 21, to modulate the make-and-break time that corresponding control signal controls described on-off switch 2 according to described remote control command.
Described driver module 5 comprises polarization converting unit 51 and LED drive unit 52, described polarization converting unit 51 is connected with described on-off switch 2 and described LED drive unit 52, for the polarity of the DC power supply exporting described driver module 5 to is fixed, described LED drive unit 52 is connected with described LED, works for controlling described LED.
Described polarization converting unit 51 comprises full-bridge rectification bridge 511 and storage capacitor C, the ac input end a of described full-bridge rectification bridge 511, b connects respectively at the positive pole 11 of described DC power supply and the drain D of described field effect transistor 21, the DC output end of described full-bridge rectification bridge 511 is connected with described LED drive unit 52, between the DC output end that one end of described storage capacitor C is connected to described full-bridge rectification bridge 511 and described LED drive unit 52, the other end ground connection of described storage capacitor C, described storage capacitor C is used for when described on-off switch 2 turns off for described LED drive unit 52 provides the electric energy being enough to make described LED normally work.
Described demodulation control module 4 comprises the first diode D1, second diode D2, first resistance R1, second resistance R2, voltage stabilizing didoe ZD and the second microprocessor 41, the anode of described first diode D1, the anode of described second diode D2 is connected with the ac input end of described full-bridge rectification bridge 511 respectively, the negative electrode of described first diode D1 is connected with described second microprocessor 41 through described first resistance R1 after being connected with the negative electrode of described second diode D2, described second resistance R2 one end is connected with the negative electrode of described first diode D1, described second resistance R2 other end ground connection, the negative electrode of described voltage stabilizing didoe ZD is connected with described second microprocessor 41, the plus earth of described voltage stabilizing didoe 41, described second microprocessor 41 is also connected with described LED drive unit 52.
LED is the light source that a kind of monochromaticjty is good, power energy consumption is little, thermal effect is little, cheap and easy to get, extensive use in electronic applications, and the LED in the present embodiment is described for MR16 shot-light conventional at present, certainly, does not also limit the LED of other models.
The operation principle of the electronic equipment that present pre-ferred embodiments communicates based on direct current supply specifically describes as follows:
In the present embodiment, 220V civil power is converted to the DC power supply of 12V by power transfer module 1, because the positive pole 11 of described DC power supply is directly connected with the ac input end a of described full-bridge rectification bridge 511, and the ac input end b of described full-bridge rectification bridge 511 is also through on-off switch 2 ground connection, therefore, when on-off switch 2 conducting, the ac input end b ground connection of described full-bridge rectification bridge 511, then DC power supply exports driver module 5 to, when on-off switch 2 turns off, the ac input end b of described full-bridge rectification bridge 511 is unsettled, then export driver module 5 to without DC power supply, it should be noted that, the ac input end a of described full-bridge rectification bridge 511, in b, any one end all can be connected with the positive pole 11 of described DC power supply, and the electric power polarity exporting LED drive unit 52 to is constant, therefore, full-bridge rectification bridge 511 can play the effect of fixed polarity, no matter the input of LED lamp B is connected with power supply A is positive and negative, the normal work of LED can be ensured, convenient, in the present embodiment, for convenience of explanation, to be connected with the positive pole 11 of described DC power supply for the ac input end a of described full-bridge rectification bridge 511 and to be described, other situations are not construed as limiting.
First microprocessor 31 receives the remote control command that external remote control equipment sends, this remote control command is the regulating command sent by remote controller, knob, switch etc., first microprocessor 31 according to this remote control command can know user need to LED carry out as regulated the adjustment such as LED luminance or switch operation, first microprocessor 31 exports according to the adjustment operation known conducting and the cut-off that low and high level to the grid G of described field effect transistor 21 controls described field effect transistor 21; When first microprocessor 31 exports high level to the grid G of described field effect transistor 21, the conducting of described field effect transistor 21, then the ac input end b ground connection of now described full-bridge rectification bridge 511, DC power supply exports driver module 5 to; When first microprocessor 31 output low level is to the grid G of described field effect transistor 21, described field effect transistor 21 is ended, then now the ac input end b of described full-bridge rectification bridge 511 is unsettled, exports driver module 5 to without DC power supply; Then first microprocessor 31 gets final product the break-make of DC power supply in control circuit by exporting low and high level.
When described field effect transistor 21 conducting, then DC power supply exports driver module 5 to, DC power supply through described full-bridge rectification bridge 511 for storage capacitor C charges, power for described LED drive unit 52 simultaneously, now have a meeting conducting in the first diode D1 and the second diode D2, then DC power supply exports high level to the second microprocessor 41 through R1; When described field effect transistor 21 is ended, then export driver module 5 to without DC power supply, namely the DC power supply in circuit disconnects, now the first diode D1 and the second diode D2 all ends, then the second microprocessor 41 obtains a low level, thus, the second microprocessor 41 gets final product the break-make of DC power supply in testing circuit according to the low and high level obtained.
Further, first microprocessor 31 can control the make-and-break time of the conducting of described field effect transistor 21 and deadline also i.e. DC power supply by the cycle controlling to export low and high level, in the present embodiment, first microprocessor 31 can control the shutoff that described on-off switch 2 is t1 with the specific interval time of carrying out within the regular hour and operate, using the control signal that the ON time length between twice shutoff operates is modulated as first microprocessor 31 according to described remote control command, when the ON time of described field effect transistor 21 is greater than set point, then represent and be ready to transmit control signal, then first microprocessor 31 starts the conducting and the cut-off that control described field effect transistor 21, the deadline of described field effect transistor 21 is always t1, owing to exporting driver module 5 to without DC power supply within the t1 time, for ensureing the normal work of LED, be then that LED powers in t1 time domestic demand by storage capacitor C, therefore, it is too low that the value of t1 must ensure that the operating voltage of LED within the t1 time can not be fallen, known through experiment test, t1 is preferably 100us, and now need to choose suitable storage capacitor C, with ensure deadline in described field effect transistor 21 in t1 LED can normally work, as as t1=100uS, then the LED of a 12V/5W only needs the storage capacitor C of about 22uF can maintain its reliable and stable work.
Control after described field effect transistor 21 ends the t1 time, to control the time of described field effect transistor 21 conducting (10*t1+t2) at first microprocessor 31.Wherein, 10*t1 is to ensure that the opening time of on-off switch 2 is not less than 10 times of turn-off time, thus ensure that LED can obtain the less stabilized power supply of a mean value fluctuation, it should be noted that, 10*t1 is a preferred value of testing acquisition by experiment, certainly, do not limit other values yet and can ensure that LED obtains the less stabilized power supply that fluctuates yet.In the ON time (10*t1+t2) of described field effect transistor 21, the value of t2 is then as the control signal that first microprocessor 31 is modulated according to described remote control command, first microprocessor 31 controls the different ON time of described field effect transistor 21 according to different remote control commands, thus modulate corresponding control signal according to the different ON time of described field effect transistor 21, as controlled the ON time (10*t1+t2) of field effect transistor 21, t2 is divided into 16 sections, increase progressively with 100uS, from 0uS to 1500uS, then t2 can represent the binary number of 4 (nibbles), if on-off switch 2 keeps the time of conducting to be 1700uS between twice turn-off time t1, then known t2 is 700uS, then representing the data sent is 7, be converted to binary system to be " 0111 ".Therefore, only need be carried out the control of accurate opening time, turn-off time to described on-off switch 2 by first microprocessor 31, corresponding control signal can be sent when not affecting LED normally works.
After first microprocessor 31 sends corresponding control signal, according to the low and high level cycle obtained, second microprocessor 41 can know that the make-and-break time of DC power supply in circuit is also opening time and the turn-off time of described on-off switch 2, then the second microprocessor 41 can according to the opening time of described on-off switch 2 counter push away restore first microprocessor 31 send control signal, the adjustment operation need carried out LED can be known according to the control signal that the first microprocessor 31 of reduction sends, described control signal to be converted to according to the adjustment need carried out the LED operation known the drive singal that LED drive unit 52 can identify by the second microprocessor 41, and the drive singal of conversion is sent to LED drive unit 52, LED is adjusted accordingly according to this drive singal by LED drive unit 52 again, as light modulation, the operations such as switch.
In other optional execution modes, when powering for multiple LED lamp simultaneously, each LED lamp all can receive the control signal of first microprocessor transmission by its second microprocessor, thus can realize unified management control, very convenient, further, the address information of each LED lamp also can be comprised in the control signal that first microprocessor sends, as increased the ON time of one section of field effect transistor 21 to write the address information of each LED lamp, thus in the control signal that first microprocessor is sent, contain the address information of each LED lamp, then each LED lamp can carry out demodulation analysis to control signal by its second microprocessor, only control adjustment is carried out to the LED lamp meeting address information in control signal, achieve and carry out for specific LED lamp the function that controls, more convenient and practical when controlling multiple LED lamp.
The present invention also proposes a kind of control method of the electronic equipment based on direct current supply communication, and civil power is converted to DC power supply by modular converter, and described DC power supply exports driver module to through on-off switch and power line, for described driver module is powered; Modulation module receives outside remote control command, and modulate according to described remote control command the make-and-break time that corresponding control signal controls on-off switch, particularly, modulation module is modulated corresponding control signal control on-off switch according to described remote control command and is carried out interval shutoff operation with the fixing turn-off time, calculates after conversion the ON time between twice shutoff as corresponding control signal.Demodulation control module carrys out control signal described in demodulation by detecting the make-and-break time of DC power supply in power line, and described control signal is converted to corresponding drive singal is sent to driver module; Driver module is according to the operating state of described drive singal control load.Further, in order to proof load can obtain the less stabilized power supply of a mean value fluctuation, described remote control command controls in the make-and-break time of on-off switch, more than 5 times of ON time at least described fixing turn-off time larger than the described fixing turn-off time of on-off switch.Owing to only need carry out controlling to send out complicated control signal to the make-and-break time of on-off switch, and only need be sent to driver module by power line together with input power, structure is very simple, the operating state of load can be adjusted accurately, in addition, different control signals according to sending can carry out various control to the operating state of load, very practical.
The above-mentioned electronic equipment based on direct current supply communication and control method thereof, controlled the make-and-break time of on-off switch according to the remote control command of outside by modulation module, thus according to described make-and-break time, described remote control command is modulated into corresponding control signal, sent by power line, control signal described in demodulation is carried out according to make-and-break time again by demodulation control module, thus control driver module to the adjustment of load operating condition, owing to only need carry out controlling to send out complicated control signal to the make-and-break time of on-off switch, and only need be sent to driver module by power line together with input power, structure is very simple, the operating state of load can be adjusted accurately, in addition, different control signals according to sending can carry out various control to the operating state of load, very practical.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or flow process conversion; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (9)
1. the electronic equipment based on direct current supply communication, comprise power supply and controlled device, it is characterized in that, described power supply comprises power transfer module, on-off switch and modulation module, described controlled device comprises demodulation control module, driver module and load, wherein:
Described power transfer module is connected with described on-off switch with modulation module;
Described demodulation control module is connected with described driver module with described load;
Described on-off switch is also connected with described driver module through power line, and described demodulation control module connects described power line;
Described power transfer module is used for civil power to be converted to DC power supply, and described DC power supply exports described driver module to through described on-off switch and power line, for described driver module is powered;
Described on-off switch is for controlling the break-make of described DC power supply;
Described modulation module is for receiving outside remote control command, modulate corresponding control signal control on-off switch according to described remote control command and carry out interval shutoff operation with the fixing turn-off time, and the ON time between twice shutoff is calculated after conversion as corresponding control signal;
The make-and-break time that described demodulation control module is used for by detecting DC power supply described in power line carrys out control signal described in demodulation, and described control signal is converted to corresponding drive singal is sent to described driver module;
Described driver module is used for the operating state controlling described load according to described drive singal.
2. electronic equipment according to claim 1, is characterized in that, described controlled device is LED lamp, and described load is LED.
3. electronic equipment according to claim 2, it is characterized in that, the positive pole of described DC power supply is connected with described driver module, the minus earth of described DC power supply, described on-off switch is field effect transistor, the grid of described field effect transistor is connected with described modulation module, and the drain electrode of described field effect transistor is connected with described driver module, the source ground of described field effect transistor.
4. electronic equipment according to claim 3, it is characterized in that, described modulation module is first microprocessor, described first microprocessor and external remote control equipment connection, to receive outside remote control command, described first microprocessor is also connected with the grid of described field effect transistor, to modulate according to described remote control command the make-and-break time that corresponding control signal controls described on-off switch.
5. electronic equipment according to claim 4, it is characterized in that, described driver module comprises polarization converting unit and LED drive unit, described polarization converting unit is connected with described on-off switch and described LED drive unit, for the polarity of the DC power supply exporting described driver module to is fixed, described LED drive unit is connected with described LED, works for controlling described LED.
6. electronic equipment according to claim 5, it is characterized in that, described polarization converting unit comprises full-bridge rectification bridge and storage capacitor, the ac input end of described full-bridge rectification bridge is connected with the positive pole of described DC power supply and the drain electrode of described field effect transistor respectively, the DC output end of described full-bridge rectification bridge is connected with described LED drive unit, between the DC output end that one end of described storage capacitor is connected to described full-bridge rectification bridge and described LED drive unit, the other end ground connection of described storage capacitor, described storage capacitor is used for when described on-off switch turns off for described LED drive unit provides the electric energy being enough to make described LED normally work.
7. electronic equipment according to claim 6, it is characterized in that, described demodulation control module comprises the first diode, second diode, first resistance, second resistance, voltage stabilizing didoe and the second microprocessor, the anode of described first diode, the anode of described second diode is connected with the ac input end of described full-bridge rectification bridge respectively, the negative electrode of described first diode is connected with described second microprocessor through described first resistance after being connected with the negative electrode of described second diode, described second resistance one end is connected with the negative electrode of described first diode, described second resistance other end ground connection, the negative electrode of described voltage stabilizing didoe is connected with described second microprocessor, the plus earth of described voltage stabilizing didoe, described second microprocessor is also connected with described LED drive unit.
8., based on a control method for the electronic equipment of direct current supply communication, it is characterized in that, comprising:
Civil power is converted to DC power supply by modular converter, and described DC power supply exports driver module to through on-off switch and power line, for described driver module is powered;
Modulation module receives outside remote control command, modulate corresponding control signal control on-off switch according to described remote control command and carry out interval shutoff operation with the fixing turn-off time, and the ON time between twice shutoff is calculated after conversion as corresponding control signal;
Demodulation control module carrys out control signal described in demodulation by detecting the make-and-break time of DC power supply in power line, and described control signal is converted to corresponding drive singal is sent to driver module;
Driver module is according to the operating state of described drive singal control load.
9. method according to claim 8, is characterized in that, described remote control command controls in the make-and-break time of on-off switch, and the ON time preset value larger than the described fixing turn-off time of on-off switch, described preset value is more than 5 times of the described fixing turn-off time.
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