CN105226608A - A kind of overheating protection circuit and Set Top Box - Google Patents
A kind of overheating protection circuit and Set Top Box Download PDFInfo
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- CN105226608A CN105226608A CN201510728058.2A CN201510728058A CN105226608A CN 105226608 A CN105226608 A CN 105226608A CN 201510728058 A CN201510728058 A CN 201510728058A CN 105226608 A CN105226608 A CN 105226608A
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Abstract
The invention belongs to protective circuit technical field, particularly relate to a kind of overheating protection circuit and Set Top Box.In embodiments of the present invention, when Set Top Box temperature raises, temperature sampling circuits for triggering are sampled to target temperature, if higher than preset temperature, generate triggering signal, latching circuit maintains triggering signal, mains switch receives triggering signal, cut off the electricity supply and to power to Set Top Box, condition prompting circuit is pointed out to user and is currently in malfunction simultaneously, which enhances performance and the life-span of Set Top Box.
Description
Technical field
The invention belongs to protective circuit technical field, particularly relate to a kind of overheating protection circuit and Set Top Box.
Background technology
On Set Top Box or machine, box (English: SetTopBox is called for short STB), is the equipment connecting television set and outside source.The digital signal of compression can be changed into television content by it, and shows on a television set.Signal can from wire cable, satellite antenna, broadband network and terrestrial broadcasting.Except the image that the content that Set Top Box receives can provide except simulated television, sound, be more to receive digital content, comprise electronic program guides, internet webpage, captions etc.Make user can watch digital television program on existing television set, and carry out interactive digital amusement, education and commercialization activity by network.
Due to constantly widening of application scenarios, set-top box device is evolved into home entertaining terminal from single digital video decoding apparatus, not only radio, film and television resource becomes high definition resource gradually, and Set Top Box itself also carries more entertainment content, comprise game, web page browsing, intelligence APP application etc., requirement for top-set hardware disposal ability improves constantly, the integrated hardware device of Set Top Box also constantly increases, the thing followed is that the Overall Power Consumption of Set Top Box constantly raises, because the Overall Power Consumption rising of Set Top Box can cause Set Top Box temperature too high, and temperature high performance and the life-span that can affect Set Top Box.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of overheating protection circuit and Set Top Box, is intended to solve present electronic equipment and causes Set Top Box temperature too high as Set Top Box exists because Overall Power Consumption raises, exist and affect the performance of Set Top Box and the problem in life-span.
The embodiment of the present invention is achieved in that a kind of overheating protection circuit, and described overheating protection circuit comprises:
Target temperature is sampled, if higher than preset temperature, generates the temperature sampling circuits for triggering of triggering signal;
Be connected with described temperature sampling circuits for triggering, to the latching circuit that described triggering signal maintains;
Be connected with described latching circuit, power supply and electronic equipment respectively, receive described triggering signal, cut off the mains switch of described power supply to power electronic equipment;
Be connected with described latching circuit, point out the current condition prompting circuit being in malfunction to user.
Another object of the embodiment of the present invention is to provide a kind of Set Top Box, and described Set Top Box comprises above-mentioned overheating protection circuit.
In embodiments of the present invention, when Set Top Box temperature raises, temperature sampling circuits for triggering are sampled to target temperature, if higher than preset temperature, generate triggering signal, latching circuit maintains triggering signal, mains switch receives triggering signal, cut off the electricity supply and to power to Set Top Box, condition prompting circuit is pointed out to user and is currently in malfunction simultaneously, which enhances performance and the life-span of Set Top Box.
Accompanying drawing explanation
Fig. 1 is the circuit module figure of the overheating protection circuit that the embodiment of the present invention provides;
Fig. 2 is the circuit structure diagram of the overheating protection circuit that first embodiment of the invention provides;
Fig. 3 is the circuit structure diagram of the overheating protection circuit that second embodiment of the invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 shows the circuit modular structure of the overheating protection circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention.
A kind of overheating protection circuit, described overheating protection circuit comprises:
Target temperature is sampled, if higher than preset temperature, generates the temperature sampling circuits for triggering 1 of triggering signal;
Be connected with described temperature sampling circuits for triggering 1, to the latching circuit 2 that described triggering signal maintains;
Be connected with described latching circuit 2, power supply 12V and electronic equipment respectively, receive described triggering signal, cut off the mains switch 3 of described power supply 12V to power electronic equipment;
Be connected with described latching circuit 2, point out the current condition prompting circuit 4 being in malfunction to user.
Fig. 2 shows the circuit structure of the overheating protection circuit that first embodiment of the invention provides, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention.
As one embodiment of the invention, described temperature sampling circuits for triggering 1 comprise:
Thermistor R8, resistance R9, resistance R10, resistance R11, resistance R18, resistance R19, electric capacity C7 and comparator chip U4;
Described thermistor R8 and resistance R9 is connected between power supply 12V and ground, described resistance R11 and resistance R10 is connected between power supply 12V and ground, the electrode input end IN+ of described comparator chip U4 connects the public connecting end of thermistor R8 and resistance R9 by resistance R18, the negative input IN-connecting resistance R11 of described comparator chip U4 and the public connecting end of resistance R10, the power end Vdd of described comparator chip U4 meets power supply 12V, between the power end Vdd that described electric capacity C7 is connected to described comparator chip U4 and ground, the output OUT of described comparator chip U4 connects described latching circuit 2, between the electrode input end IN+ that described resistance R19 is connected to described comparator chip U4 and output OUT.
As one embodiment of the invention, described latching circuit 2 comprises:
Electric capacity C8, electric capacity C9, triode Q15, triode Q16, diode D6, diode D7, resistance R12, resistance R15, resistance R16, resistance R17 and resistance R18;
The anode of described diode D6 meets the output OUT of described comparator chip U4, the negative electrode of described diode D6 connects the base stage of described triode Q15 by described resistance R12, the grounded emitter of described triode Q15, between the base stage that described electric capacity C9 and resistance R16 is connected in parallel on described triode Q15 and ground, the collector electrode of described triode Q15 meets power supply 12V by the resistance R15 of series connection and resistance R17, the base stage of described triode Q15 connects the anode of described diode D7 by described resistance R18, the negative electrode of described diode D7 is that the output of described latching circuit 2 connects described mains switch 3 and condition prompting circuit 4 simultaneously, the base stage connecting resistance R15 of described triode Q16 and the public connecting end of resistance R17, the collector electrode of described triode Q16 connects the anode of described diode D7, the emitter of described triode Q16 meets power supply 12V, between the negative electrode that described electric capacity C8 is connected to described diode D7 and ground.
As one embodiment of the invention, described mains switch 3 comprises:
Resistance R14, resistance R22, electric capacity C13 and metal-oxide-semiconductor Q14;
The grid of described metal-oxide-semiconductor Q14 connects the output of described latching circuit 2 by resistance R22, between the grid that described resistance R14 is connected to described metal-oxide-semiconductor Q14 and ground, the source electrode of described metal-oxide-semiconductor Q14 meets power supply 12V, the drain electrode of described metal-oxide-semiconductor Q14 connects described electronic equipment, between the drain electrode that described electric capacity C13 is connected to described metal-oxide-semiconductor Q14 and ground.
As one embodiment of the invention, described condition prompting circuit 4 comprises:
Warning light LED and resistance R9;
Between the output that described warning light LED and resistance R9 is connected on described latching circuit 2 and ground.
Fig. 3 shows the circuit structure of the overheating protection circuit that second embodiment of the invention provides, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention.
As one embodiment of the invention, described latching circuit 2 comprises:
Diode D1, resistance R1, electric capacity C1 and controllable silicon D4;
The anode of described diode D1 meets the output OUT of described comparator chip U4, the negative electrode of described diode D1 connects the controlled end of described controllable silicon D4 by described resistance R1, the anode of described controllable silicon D4 meets power supply 12V, the negative electrode of described controllable silicon D4 is that the output of described latching circuit 2 connects described mains switch 3 and condition prompting circuit 4, between the negative electrode that described electric capacity C1 is connected to described controllable silicon D4 and ground simultaneously.
The embodiment of the present invention also provides a kind of Set Top Box, and described Set Top Box comprises overheating protection circuit as above, and described overheating protection circuit comprises:
Target temperature is sampled, if higher than preset temperature, generates the temperature sampling circuits for triggering 1 of triggering signal;
Be connected with described temperature sampling circuits for triggering 1, to the latching circuit 2 that described triggering signal maintains;
Be connected with described latching circuit 2, power supply 12V and Set Top Box body respectively, receive described triggering signal, cut off the mains switch 3 that described power supply 12V powers to described Set Top Box body;
Be connected with described latching circuit 2, point out the current condition prompting circuit 4 being in malfunction to user.
Overheating protection circuit particular circuit configurations is described above, repeats no more here.
When complete machine temperature raises, the resistance of thermistor R8 constantly declines, and causes the sampled voltage of the electrode input end IN+ of comparator chip U4 also to increase; When predeterminated voltage higher than negative input IN-of the electrode input end IN+ voltage of comparator chip U4, the output OUT of comparator chip U4 exports high level, and diode D7 negative electrode exports 12V, metal-oxide-semiconductor Q14 turns off, system stalls, warning light LED is luminous, prompting malfunction.After power-off, even if complete machine temperature declines, due to the effect of latching circuit 2, current state also can not change automatically, and after must being fixed a breakdown by user, re-power, equipment just can be reworked.
In embodiments of the present invention, when Set Top Box temperature raises, temperature sampling circuits for triggering are sampled to target temperature, if higher than preset temperature, generate triggering signal, latching circuit maintains triggering signal, mains switch receives triggering signal, cut off the electricity supply and to power to Set Top Box, condition prompting circuit is pointed out to user and is currently in malfunction simultaneously, which enhances performance and the life-span of Set Top Box.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. an overheating protection circuit, is characterized in that, described overheating protection circuit comprises:
Target temperature is sampled, if higher than preset temperature, generates the temperature sampling circuits for triggering of triggering signal;
Be connected with described temperature sampling circuits for triggering, to the latching circuit that described triggering signal maintains;
Be connected with described latching circuit, power supply and electronic equipment respectively, receive described triggering signal, cut off the mains switch of described power supply to power electronic equipment;
Be connected with described latching circuit, point out the current condition prompting circuit being in malfunction to user.
2. overheating protection circuit as claimed in claim 1, it is characterized in that, described temperature sampling circuits for triggering comprise:
Thermistor R8, resistance R9, resistance R10, resistance R11, resistance R18, resistance R19, electric capacity C7 and comparator chip U4;
Described thermistor R8 and resistance R9 is connected between VDD-to-VSS, described resistance R11 and resistance R10 is connected between VDD-to-VSS, the electrode input end IN+ of described comparator chip U4 connects the public connecting end of thermistor R8 and resistance R9 by resistance R18, the negative input IN-connecting resistance R11 of described comparator chip U4 and the public connecting end of resistance R10, the power end Vdd of described comparator chip U4 connects power supply, between the power end Vdd that described electric capacity C7 is connected to described comparator chip U4 and ground, the output OUT of described comparator chip U4 connects described latching circuit, between the electrode input end IN+ that described resistance R19 is connected to described comparator chip U4 and output OUT.
3. overheating protection circuit as claimed in claim 2, it is characterized in that, described latching circuit comprises:
Electric capacity C8, electric capacity C9, triode Q15, triode Q16, diode D6, diode D7, resistance R12, resistance R15, resistance R16, resistance R17 and resistance R18;
The anode of described diode D6 meets the output OUT of described comparator chip U4, the negative electrode of described diode D6 connects the base stage of described triode Q15 by described resistance R12, the grounded emitter of described triode Q15, between the base stage that described electric capacity C9 and resistance R16 is connected in parallel on described triode Q15 and ground, the collector electrode of described triode Q15 connects power supply by the resistance R15 of series connection and resistance R17, the base stage of described triode Q15 connects the anode of described diode D7 by described resistance R18, the negative electrode of described diode D7 is that the output of described latching circuit connects described mains switch and condition prompting circuit simultaneously, the base stage connecting resistance R15 of described triode Q16 and the public connecting end of resistance R17, the collector electrode of described triode Q16 connects the anode of described diode D7, the emitter of described triode Q16 connects power supply, between the negative electrode that described electric capacity C8 is connected to described diode D7 and ground.
4. overheating protection circuit as claimed in claim 2, it is characterized in that, described latching circuit comprises:
Diode D1, resistance R1, electric capacity C1 and controllable silicon D4;
The anode of described diode D1 meets the output OUT of described comparator chip U4, the negative electrode of described diode D1 connects the controlled end of described controllable silicon D4 by described resistance R1, the anode of described controllable silicon D4 connects power supply, the negative electrode of described controllable silicon D4 is that the output of described latching circuit connects described mains switch and condition prompting circuit, between the negative electrode that described electric capacity C1 is connected to described controllable silicon D4 and ground simultaneously.
5. the overheating protection circuit as described in claim 3 or 4, is characterized in that, described mains switch comprises:
Resistance R14, resistance R22, electric capacity C13 and metal-oxide-semiconductor Q14;
The grid of described metal-oxide-semiconductor Q14 connects the output of described latching circuit by resistance R22, between the grid that described resistance R14 is connected to described metal-oxide-semiconductor Q14 and ground, the source electrode of described metal-oxide-semiconductor Q14 connects power supply, the drain electrode of described metal-oxide-semiconductor Q14 connects described electronic equipment, between the drain electrode that described electric capacity C13 is connected to described metal-oxide-semiconductor Q14 and ground.
6. the overheating protection circuit as described in claim 3 or 4, is characterized in that, described condition prompting circuit comprises:
Warning light LED and resistance R9;
Between the output that described warning light LED and resistance R9 is connected on described latching circuit and ground.
7. a Set Top Box, is characterized in that, described Set Top Box comprises the overheating protection circuit as described in any one of claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510728058.2A CN105226608B (en) | 2015-10-30 | 2015-10-30 | A kind of overheating protection circuit and set-top box |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510728058.2A CN105226608B (en) | 2015-10-30 | 2015-10-30 | A kind of overheating protection circuit and set-top box |
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| CN105226608A true CN105226608A (en) | 2016-01-06 |
| CN105226608B CN105226608B (en) | 2018-05-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105610126A (en) * | 2015-12-24 | 2016-05-25 | 深圳市共进电子股份有限公司 | Overtemperature protection circuit of network equipment |
| CN105610125A (en) * | 2015-12-24 | 2016-05-25 | 深圳市共进电子股份有限公司 | Overtemperature protection circuit of network equipment |
| CN106602511A (en) * | 2016-12-14 | 2017-04-26 | 安徽长龙电气集团有限公司 | Overheating protection circuit for power distribution cabinet |
| CN114915817A (en) * | 2022-05-18 | 2022-08-16 | 中山亿联智能科技有限公司 | Thermoelectric generator set top box |
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| US9042069B2 (en) * | 2009-09-25 | 2015-05-26 | Autonetworks Technologies, Ltd. | Power supply controller |
| CN102623956A (en) * | 2012-04-26 | 2012-08-01 | 德中利德(天津)生物技术有限公司 | 60-DEG C thermal circuit breaker |
| CN102820637A (en) * | 2012-08-21 | 2012-12-12 | 浪潮电子信息产业股份有限公司 | Circuit self-locking protective device with self-recovery function |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105610126A (en) * | 2015-12-24 | 2016-05-25 | 深圳市共进电子股份有限公司 | Overtemperature protection circuit of network equipment |
| CN105610125A (en) * | 2015-12-24 | 2016-05-25 | 深圳市共进电子股份有限公司 | Overtemperature protection circuit of network equipment |
| CN106602511A (en) * | 2016-12-14 | 2017-04-26 | 安徽长龙电气集团有限公司 | Overheating protection circuit for power distribution cabinet |
| CN114915817A (en) * | 2022-05-18 | 2022-08-16 | 中山亿联智能科技有限公司 | Thermoelectric generator set top box |
| CN114915817B (en) * | 2022-05-18 | 2023-08-18 | 中山亿联智能科技有限公司 | Thermoelectric generator top box |
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| CN105226608B (en) | 2018-05-11 |
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