CN104317331A - Pre-heating control device and pre-heating control method based on optical MOS relay - Google Patents
Pre-heating control device and pre-heating control method based on optical MOS relay Download PDFInfo
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- CN104317331A CN104317331A CN201410483655.9A CN201410483655A CN104317331A CN 104317331 A CN104317331 A CN 104317331A CN 201410483655 A CN201410483655 A CN 201410483655A CN 104317331 A CN104317331 A CN 104317331A
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Abstract
The invention relates to the field of electronic equipment pre-heating, and discloses a pre-heating control device based on an optical MOS relay, comprising an optical MOS relay, a pull-up resistor, a pull-down resistor and a heating device. The input side of the optical MOS relay is provided with an LED, and the output side of the optical MOS relay is provided with an MOSFET. The MOSFET and the heating device are arranged in the same loop, and the heating device is started when the MOSFET is switched on. One end of the pull-up resistor is connected with the anode of the LED, and the other end is connected with a power supply. One end of the pull-down resistor is connected with the cathode of the LED, and the other end is grounded. The pull-up resistor and the pull-down resistor with appropriate resistance are selected to enable the actual current flowing through the LED is slightly larger than the positive trigger current of the LED at a critical trigger temperature. The invention further discloses a pre-heating control method based on an optical MOS relay. According to the pre-heating control device of the invention, photoelectric switch control is carried out based on the change of the current of an input isolation coupling device of the optical MOS relay with temperature, and pre-heating before starting-up can be realized. The pre-heating control device is small in size, low in cost and high in sensitivity.
Description
Technical field
The present invention relates to electronic equipment heating art, particularly relate to a kind of preheating control device and preheating control method based on PhotoMOS relay.
Background technology
Along with needing in every field, the product adapting to low temperature environment is increasing, the application scenario of heating control apparatus also gets more and more, as outdoor version CCTV camera, intelligent grid equipment, communication facilities, computer equipment, space flight and aviation equipment etc. all need to increase heating control apparatus.Along with the generally application of these electronic equipments, the application place often temperature difference is larger, for some areas that temperature is colder, in order to strengthen the adaptive capacity to environment of electronic equipment, must consider to increase heating control apparatus, the switch of heating control apparatus then can be considered to carry out remote auto control by intelligent control system, but the prerequisite done like this is intelligent system must be able to normally be started.
The method of pre existing computer heating control is carry out programmed control by the scheme that the cost such as special integrated circuit or programmable logic device (CPLD) is higher mostly, and these schemes preheat control action based on just playing under the normal prerequisite of special integrated circuit Control timing sequence often, and special integrated circuit cost is higher, thus limit applied environment and the mass production of special integrated circuit.
Therefore, research and develop a reliability high, highly sensitive, cost is low, the life-span miniaturized electronic devices heating control apparatus of length seems urgent especially, PhotoMOS relay has broken away from the poor sensitivity of traditional mechanical relay, there is action noise, the shortcomings such as serviceable life is short, and possess the unexistent high voltage control of general SSR (contactless solid-state relay), low on-resistance, load end AC/DC dual-purpose is energized, the good characteristics such as low current leakage, therefore, PhotoMOS relay is in telecommunication, communication apparatus, automatic detection, safety and apparatus of taking precautions against natural calamities, there is wide application demand the aspects such as measuring appliance, especially the electronic equipment preheating system being applied to this low-power consumption setting is applicable to.
Summary of the invention
For overcoming the deficiencies in the prior art, the present invention seeks to: provide a kind of and preheat control device based on PhotoMOS relay, the electronic component in electronic equipment is heated before start, to maintain system normal work at low ambient temperatures in advance.
In order to solve the technical matters in background technology, the invention provides and a kind ofly preheat control device based on PhotoMOS relay, comprise PhotoMOS relay, pull-up resistor, pull down resistor and heating arrangement, wherein, PhotoMOS relay input side comprises LED diode, outgoing side comprises MOSFET, described MOSFET and heating arrangement are arranged in a loop, when MOSFET conducting, described heating arrangement starts, one end of described pull-up resistor is connected with the positive pole of LED diode, the other end is connected with power supply, one end of described pull down resistor is connected with the negative pole of LED diode, other end ground connection, the electric current flowing through LED diode is a bit larger tham LED forward trigger current during critical trigger temperatures.
The described control device that preheats based on PhotoMOS relay also comprises controller, and a certain output terminal of described controller is connected with the negative pole of described LED diode, and described output terminal exports high level or low level.
The described control device that preheats based on PhotoMOS relay also comprises temperature sensor, for the ambient temperature signal detected is sent to described controller.
Particularly, described critical trigger temperatures is that electronic equipment is expected to start pre-warmed temperature, and when environment temperature is equal to or less than critical trigger temperatures, described LED diode current flow is luminous.
When the electric current flowing through LED diode after the luminescence of described LED diode current flow is slightly lower than LED forward cut-off current, described LED diode ceases conducting is luminous; Or during a little higher than heating stop temperature of the ambient temperature signal that temperature sensor detects, the described output terminal of controller exports high level, and described LED diode not conducting is luminous, described heating stop temperature is the temperature that electronic equipment expects to stop heating.
Present invention also offers and a kind ofly preheat control method based on PhotoMOS relay, PhotoMOS relay is adopted to control the switch of firing equipment, the electric current that the LED diode arranging PhotoMOS relay input side passes through is a bit larger tham LED forward trigger current during critical trigger temperatures, when environment temperature is less than or equal to critical trigger temperatures, described LED diode current flow is luminous, the outgoing side conducting of MOS relay, heating arrangement is opened; When environment temperature exports high level greater than or equal to critical shutoff temperature or controller to LED negative pole, LED diode ceases conducting is luminous, and the outgoing side of MOS relay disconnects, and heating arrangement cuts out.
Preferably, pull-up resistor and the pull down resistor of suitable resistance is chosen according to LED forward trigger current during critical trigger temperatures, LED forward trigger current when making the electric current flowing through LED diode be a bit larger tham critical trigger temperatures, wherein, described critical trigger temperatures is that electronic equipment is expected to start pre-warmed temperature; When being slightly smaller than LED forward cut-off current by the electric current of LED diode after the luminescence of described LED diode current flow, described LED diode ceases conducting is luminous, and temperature is now critical shutoff temperature.
Controller receives the ambient temperature signal that temperature sensor detects, and the temperature stopping heating being expected by setting electronic equipment, and when the heating stop temperature of a little higher than setting of the environment temperature that temperature sensor detects, described controller exports high level.Wherein, the value of value higher than described critical trigger temperatures of heating stop temperature is set.
When the environment temperature detection signal that temperature sensor sends controller to is slightly less than or equal to described critical trigger temperatures, described controller output low level.
The principle preheating control device based on PhotoMOS relay of the present invention is the input side of 1. PhotoMOS relay is LED diode, the electric current flowing through LED diode reduces with temperature and raises, namely there is a low temperature critical value, when temperature drops to low temperature critical value, reach forward trigger current by the electric current of LED diode, make LED diode current flow luminous; 2. the break-make of LED diode controls the break-make of the MOSFET of PhotoMOS relay outgoing side; 3. MOSFET and heating arrangement are in same circuit, and the break-make of MOSFET controls the opening and closing of heating arrangement; 4. the cut-off current of LED diode raises with the rising of temperature, and when the cut-off current of LED diode is elevated to the actual current size by LED diode, temperature now reaches shutoff critical value; 5. controller is by exporting the break-make of low and high level control LED diode; 6. control strategy is that temperature sensor sends the temperature signal detected to controller, if the temperature detected is higher than the heating stop temperature value of setting, then controller exports high level; If the temperature detected is lower than the unlatching heating-up temperature value of setting, then controller output low level; 7. learn from the inquiry of PhotoMOS relay handbook, the forward current minimum value triggering LED is 0.3mA, namely conducting is got final product when LED forward current is greater than 0.3mA luminous, namely can by regulating the break-make that be regulated PhotoMOS relay by the forward current size of LED.
Adopt technique scheme, the present invention has following beneficial effect: 1. based on temperature and the current characteristics of PhotoMOS relay, can before electronic apparatus system start the LED of automatic conducting PhotoMOS relay inside, thus control the unlatching of rear end heating arrangement, preheat before realizing starting shooting; 2. preheat in the present invention and can realize based on monolithic PhotoMOS relay and simple peripheral circuit completely, save the making sheet space of circuit board, saving components cost; 3. adopt PhotoMOS relay, insulate completely between constrained input, carry out optically-coupled with LED and photovalve and realize input and output transmission, fast response time, device lifetime is long.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation preheating control device based on PhotoMOS relay that the embodiment of the present invention provides;
Fig. 2 is the computer heating control structural drawing preheating control device based on PhotoMOS relay that the embodiment of the present invention provides;
Fig. 3 is the temperature acquisition structural drawing preheating control device based on PhotoMOS relay that the embodiment of the present invention provides;
Fig. 4 is the structural drawing preheating PhotoMOS relay in control device based on PhotoMOS relay that the embodiment of the present invention provides;
Fig. 5 is the circuit diagram preheating PhotoMOS relay in control device based on PhotoMOS relay that the embodiment of the present invention provides;
Fig. 6 be the embodiment of the present invention provide preheat the temperature of LED diode and the performance diagram of trigger current in control device based on PhotoMOS relay;
Fig. 7 be the embodiment of the present invention provide preheat the temperature of LED diode and the performance diagram of cut-off current in control device based on PhotoMOS relay.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
The structural representation preheating control device based on PhotoMOS relay that embodiment: Fig. 1 provides for the embodiment of the present invention, Fig. 2 is the computer heating control structural drawing preheating control device based on PhotoMOS relay that the embodiment of the present invention provides, can be clear that by figure, the described control device that preheats based on PhotoMOS relay comprises PhotoMOS relay, pull-up resistor, pull down resistor and heating arrangement, wherein, PhotoMOS relay input side comprises LED diode, outgoing side comprises MOSFET, described MOSFET and heating arrangement are arranged in a loop, when MOSFET conducting, described heating arrangement starts, one end of described pull-up resistor is connected with the positive pole of LED diode, the other end is connected with power supply, one end of described pull down resistor is connected with the negative pole of LED diode, other end ground connection, the electric current flowing through LED diode is a bit larger tham LED forward trigger current during critical trigger temperatures.
Preferably, the described control device that preheats based on PhotoMOS relay also comprises controller, and a certain output terminal of described controller is connected with the negative pole of described LED diode, and described output terminal exports high level or low level.
Preferably, the described control device that preheats based on PhotoMOS relay also comprises temperature sensor, for the ambient temperature signal detected is sent to described controller.As shown in Figure 3, the temperature sensor of the present embodiment adopts the digital temperature sensor DS18B20 of more common single line output.
As shown in Figure 2, the PhotoMOS relay of the present embodiment adopts the PhotoMOS relay AQY212GS of Panasonic, heating arrangement adopts heating plate or the heat block of 5V or 12V with practical application, controller adopts the single-chip microcomputer carrying GPIO (universal input output), or carries the ARM program control chip of GPIO.
Described critical trigger temperatures is that electronic equipment is expected to start pre-warmed temperature, and when environment temperature is equal to or less than critical trigger temperatures, described LED diode current flow is luminous.
In embodiments of the present invention, critical trigger temperatures is set as 0 DEG C, as shown in Figure 2, the power supply that pull-up resistor connects is 3.3V, and pull-up resistor is 2K Ω, and pull down resistor is 220 Ω, the internal resistance loss of removing LED own, the actual current by LED diode that this example obtains is probably at about 1mA; As shown in Figure 6, when lower than 0 DEG C, LED forward trigger current, probably at about 0.85mA, is namely greater than LED forward trigger current by the actual current of LED diode, and namely when the critical trigger temperatures of 0 DEG C, LED diode current flow is luminous.
When the electric current flowing through LED diode after the luminescence of described LED diode current flow is slightly lower than LED forward cut-off current, described LED diode ceases conducting is luminous; Or, during a little higher than heating stop temperature of the ambient temperature signal that temperature sensor detects, the described output terminal of controller exports high level, described LED diode turns off, described heating stop temperature is the temperature that electronic equipment expects to stop heating, in the present embodiment, heating stop temperature is preferably set to 15 DEG C, after electronic equipment starts, when temperature sensor detects that environment temperature is elevated to 15 DEG C, controller exports high level, and LED diode turns off and stops luminescence, the output terminal of PhotoMOS relay disconnects, and firing equipment cuts out.
Present invention also offers and a kind ofly preheat control method based on PhotoMOS relay, PhotoMOS relay is adopted to control the switch of firing equipment, the electric current that the LED diode arranging PhotoMOS relay input side passes through is a bit larger tham LED forward trigger current during critical trigger temperatures, when environment temperature is less than or equal to critical trigger temperatures, described LED diode current flow is luminous, the outgoing side conducting of MOS relay, heating arrangement is opened; When environment temperature exports high level greater than or equal to critical shutoff temperature or controller to LED negative pole, LED diode ceases conducting is luminous, and the outgoing side of MOS relay disconnects, and heating arrangement cuts out.
Pull-up resistor and the pull down resistor of suitable resistance is chosen according to LED forward trigger current during critical trigger temperatures, LED forward trigger current when making the electric current flowing through LED diode be a bit larger tham critical trigger temperatures, wherein, described critical trigger temperatures is that electronic equipment is expected to start pre-warmed temperature; When being slightly smaller than LED forward cut-off current by the electric current of LED diode after the luminescence of described LED diode current flow, described LED diode ceases conducting is luminous, and temperature is now critical shutoff temperature.
Controller receives the ambient temperature signal that temperature sensor detects, the temperature stopping heating being expected by setting electronic equipment, in the present embodiment, heating stop temperature is preferably set to 15 DEG C, when the heating stop temperature of a little higher than setting of the environment temperature that temperature sensor detects, described controller exports high level.Apparently, set the value of value higher than described critical trigger temperatures of heating stop temperature, after electronic equipment starts, when temperature sensor detects that environment temperature is elevated to 15 DEG C, controller exports high level, LED diode turns off and stops luminescence, and the output terminal of PhotoMOS relay disconnects, and firing equipment cuts out.
When the environment temperature detection signal that temperature sensor sends controller to is slightly less than or equal to described critical trigger temperatures, described controller output low level.
Heating control apparatus of the present invention utilizes the temperature variant characteristic of electric current of the input isolation coupling device of PhotoMOS relay to carry out optoelectronic switch control, and preheat before can realizing start, volume is little, and cost is low, highly sensitive.
Above disclosedly be only several preferred embodiment of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (9)
1. one kind preheats control device based on PhotoMOS relay, it is characterized in that, comprise PhotoMOS relay, pull-up resistor, pull down resistor and heating arrangement, wherein, PhotoMOS relay input side comprises LED diode, outgoing side comprises MOSFET, described MOSFET and heating arrangement are arranged in a loop, when MOSFET conducting, described heating arrangement starts, one end of described pull-up resistor is connected with the positive pole of LED diode, the other end is connected with power supply, one end of described pull down resistor is connected with the negative pole of LED diode, other end ground connection, the electric current flowing through LED diode is a bit larger tham LED forward trigger current during critical trigger temperatures.
2. as claimed in claim 1 preheat control device based on PhotoMOS relay, it is characterized in that, also comprise controller, an output terminal of described controller is connected with the negative pole of described LED diode, and described output terminal can export high level or low level.
3. as claimed in claim 2 preheat control device based on PhotoMOS relay, it is characterized in that, also comprise temperature sensor, for testing environment temperature signal, described ambient temperature signal is sent to described controller.
4. as described in claim 1 or 3, preheat control device based on PhotoMOS relay, it is characterized in that, described critical trigger temperatures is that electronic equipment is expected to start pre-warmed temperature, and when environment temperature is equal to or less than critical trigger temperatures, described LED diode current flow is luminous.
5. as described in claim 3 or 4, preheat control device based on PhotoMOS relay, it is characterized in that, when the electric current flowing through LED diode after the luminescence of described LED diode current flow is slightly lower than LED forward cut-off current, described LED diode ceases conducting is luminous; Or during a little higher than heating stop temperature of the ambient temperature signal that temperature sensor detects, the described output terminal of controller exports high level, and described LED diode turns off, described heating stop temperature is the temperature that electronic equipment expects to stop heating.
6. one kind preheats control method based on PhotoMOS relay, it is characterized in that, PhotoMOS relay is adopted to control the switch of firing equipment, the electric current that the LED diode arranging PhotoMOS relay input side passes through is a bit larger tham LED forward trigger current during critical trigger temperatures, when environment temperature is less than or equal to critical trigger temperatures, described LED diode current flow is luminous, the outgoing side conducting of MOS relay, and heating arrangement is opened; When environment temperature exports high level greater than or equal to critical shutoff temperature or controller to LED negative pole, LED diode ceases conducting is luminous, and the outgoing side of MOS relay disconnects, and heating arrangement cuts out.
7. as claimed in claim 6 preheat control method based on PhotoMOS relay, it is characterized in that, pull-up resistor and the pull down resistor of suitable resistance is chosen according to LED forward trigger current during critical trigger temperatures, LED forward trigger current when making the electric current flowing through LED diode be a bit larger tham critical trigger temperatures, wherein, described critical trigger temperatures is that electronic equipment is expected to start pre-warmed temperature; When being slightly smaller than LED forward cut-off current by the electric current of LED diode after the luminescence of described LED diode current flow, described LED diode ceases conducting is luminous, and temperature is now critical shutoff temperature.
8. as claimed in claims 6 or 7 preheat control method based on PhotoMOS relay, it is characterized in that, controller receives the ambient temperature signal that temperature sensor detects, the temperature stopping heating being expected by setting electronic equipment, when the heating stop temperature of a little higher than setting of the environment temperature that temperature sensor detects, described controller exports high level.
9. as described in claim 6 or 8, preheat control method based on PhotoMOS relay, it is characterized in that, when the environment temperature detection signal that temperature sensor sends controller to is slightly less than or equal to described critical trigger temperatures, described controller output low level.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410483655.9A CN104317331A (en) | 2014-09-19 | 2014-09-19 | Pre-heating control device and pre-heating control method based on optical MOS relay |
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| CN201410483655.9A CN104317331A (en) | 2014-09-19 | 2014-09-19 | Pre-heating control device and pre-heating control method based on optical MOS relay |
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| CN104317331A true CN104317331A (en) | 2015-01-28 |
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Cited By (3)
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| CN105589382A (en) * | 2015-12-22 | 2016-05-18 | 江阴市辉龙电热电器有限公司 | Heater alarm and control module |
| CN107943139A (en) * | 2017-11-28 | 2018-04-20 | 中国航空工业集团公司洛阳电光设备研究所 | One kind is used for infrared window frost prevention deicing control device and control method |
| CN109375562A (en) * | 2018-12-14 | 2019-02-22 | 苏州蓝石新动力有限公司 | A kind of circuit control device and electronic transit equipment |
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