CN105226608B - 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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- CN105226608B CN105226608B CN201510728058.2A CN201510728058A CN105226608B CN 105226608 B CN105226608 B CN 105226608B CN 201510728058 A CN201510728058 A CN 201510728058A CN 105226608 B CN105226608 B CN 105226608B
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Abstract
The invention belongs to protect field of circuit technology, more particularly 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 trigger circuit samples target temperature, if being higher than preset temperature, trigger signal is generated, latching circuit maintains trigger signal, power switch receives trigger signal, cut off the power and power to set-top box, while condition prompting circuit prompts the user with and is currently at malfunction, so improves performance and the service life of set-top box.
Description
Technical field
The invention belongs to protect field of circuit technology, more particularly to a kind of overheating protection circuit and set-top box.
Background technology
Box (English on set-top box or machine：Set Top Box, abbreviation STB), it is a connection television set and outside source
Equipment.The digital signal of compression can be changed into television content by it, and be shown on a television set.Signal can come from
Line cable, satellite antenna, broadband network and terrestrial broadcasting.The figure that the content that set-top box receives can be provided except simulated television
Outside picture, sound, more it is that digital content, including electronic program guides, internet webpage, subtitle etc. can be received.Use
Family can watch digital television program on existing television set, and formula digitlization amusement, education and business can be interacted by network
Industry activity.
Due to constantly widening for application scenarios, set-top box device is got married from single digital video decoding apparatus evolution
Front yard recreation terminal, not only radio, film and television resource gradually becomes high definition resource, but also set-top box also carries more amusements in itself
Content, including game, web page browsing, intelligence APP applications etc., the requirement for top-set hardware disposal ability is continuously improved, machine
The hardware device that top box integrates also is continuously increased, and the thing followed is that the Overall Power Consumption of set-top box constantly raises, because set-top box
Overall Power Consumption rise set-top box temperature can be caused excessive, and temperature height can influence performance and the service life of set-top box.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of overheating protection circuit and set-top box, it is intended to solves present electronics and sets
Standby to cause set-top box temperature excessive because Overall Power Consumption raises as set-top box exists, existing influences the performance of set-top box and asking for service life
Topic.
The embodiment of the present invention is achieved in that a kind of overheating protection circuit, and the overheating protection circuit includes：
Target temperature is sampled, if being higher than preset temperature, generates the temperature sampling trigger circuit of trigger signal；
It is connected with the temperature sampling trigger circuit, the latching circuit maintained to the trigger signal；
It is connected respectively with the latching circuit, power supply and electronic equipment, receives the trigger signal, cuts off the power supply pair
The power switch of power electronic equipment；
It is connected with the latching circuit, prompts the user with the condition prompting circuit for being currently at malfunction.
The another object of the embodiment of the present invention is to provide a kind of set-top box, and the set-top box includes above-mentioned overtemperature protection
Circuit.
In embodiments of the present invention, when set-top box temperature raises, temperature sampling trigger circuit adopts target temperature
Sample, if being higher than preset temperature, generates trigger signal, and latching circuit maintains trigger signal, and power switch receives triggering letter
Number, cut off the power and power to set-top box, while condition prompting circuit prompts the user with and is currently at malfunction, so improves
The performance of set-top box and service life.
Brief description of the drawings
Fig. 1 is the circuit module figure of overheating protection circuit provided in an embodiment of the present invention；
Fig. 2 is the circuit structure diagram for the overheating protection circuit that first embodiment of the invention provides；
Fig. 3 is the circuit structure diagram for the overheating protection circuit that second embodiment of the invention provides.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 shows the circuit modular structure of overheating protection circuit provided in an embodiment of the present invention, for convenience of description, only
Show and the relevant part of the embodiment of the present invention.
A kind of overheating protection circuit, the overheating protection circuit include：
Target temperature is sampled, if being higher than preset temperature, generates the temperature sampling trigger circuit 1 of trigger signal；
It is connected with the temperature sampling trigger circuit 1, the latching circuit 2 maintained to the trigger signal；
It is connected respectively with the latching circuit 2, power supply 12V and electronic equipment, receives the trigger signal, cuts off the electricity
Power switches 3 of the source 12V to power electronic equipment；
It is connected with the latching circuit 2, prompts the user with the condition prompting circuit 4 for being currently at malfunction.
Fig. 2 shows the circuit structure for the overheating protection circuit that first embodiment of the invention provides, for convenience of description, only
Show and the relevant part of the embodiment of the present invention.
As an embodiment of the present invention, the temperature sampling trigger circuit 1 includes：
Thermistor R8, resistance R9, resistance R10, resistance R11, resistance R18, resistance R19, capacitance C7 and comparator chip
U4；
The thermistor R8 and resistance R9 are connected between power supply 12V and ground, resistance R11 and resistance the R10 series connection
Between power supply 12V and ground, the electrode input end IN+ of the comparator chip U4 meets thermistor R8 and electricity by resistance R18
The public connecting end of R9 is hindered, negative input the IN- connecting resistances R11's and resistance R10 of the comparator chip U4 is commonly connected
End, the power end Vdd of the comparator chip U4 meet power supply 12V, the capacitance C7 and are connected to the electricity of the comparator chip U4
Between source Vdd and ground, the output terminal OUT of the comparator chip U4 connects the latching circuit 2, and the resistance R19 is connected to
Between the electrode input end IN+ and output terminal OUT of the comparator chip U4.
As an embodiment of the present invention, the latching circuit 2 includes：
Capacitance C8, capacitance C9, triode Q15, triode Q16, diode D6, diode D7, resistance R12, resistance R15,
Resistance R16, resistance R17 and resistance R18；
The anode of the diode D6 meets the output terminal OUT of the comparator chip U4, and the cathode of the diode D6 leads to
Cross the base stage that the resistance R12 meets the triode Q15, the emitter ground connection of the triode Q15, the capacitance C9 and resistance
R16 is connected in parallel between base stage and the ground of the triode Q15, the collector of the triode Q15 by the resistance R15 of series connection and
Resistance R17 meets power supply 12V, and the base stage of the triode Q15 connects the anode of the diode D7 by the resistance R18, described
The cathode of diode D7 connects the power switch 3 and condition prompting circuit 4 at the same time for the output terminal of the latching circuit 2, described
The public connecting end of the base stage connecting resistance R15 and resistance R17 of triode Q16, the collector of the triode Q16 connect two pole
The anode of pipe D7, the emitter of the triode Q16 meet power supply 12V, the capacitance C8 and are connected to the cathode of the diode D7
Between ground.
As an embodiment of the present invention, the power switch 3 includes：
Resistance R14, resistance R22, capacitance C13 and metal-oxide-semiconductor Q14；
The grid of the metal-oxide-semiconductor Q14 connects the output terminal of the latching circuit 2, the resistance R14 connections by resistance R22
Between the grid and ground of the metal-oxide-semiconductor Q14, the source electrode of the metal-oxide-semiconductor Q14 meets power supply 12V, and the drain electrode of the metal-oxide-semiconductor Q14 connects
The electronic equipment, the capacitance C13 are connected between drain electrode and the ground of the metal-oxide-semiconductor Q14.
As an embodiment of the present invention, the condition prompting circuit 4 includes：
Warning light LED and resistance R9；
The warning light LED and resistance R9 are connected between the output terminal and ground of the latching circuit 2.
Fig. 3 shows the circuit structure for the overheating protection circuit that second embodiment of the invention provides, for convenience of description, only
Show and the relevant part of the embodiment of the present invention.
As an embodiment of the present invention, the latching circuit 2 includes：
Diode D1, resistance R1, capacitance C1 and silicon-controlled D4；
The anode of the diode D1 meets the output terminal OUT of the comparator chip U4, and the cathode of the diode D1 leads to
The controllable end that the resistance R1 meets the silicon-controlled D4 is crossed, the anode of the silicon-controlled D4 meets power supply 12V, the silicon-controlled D4's
Cathode connects the power switch 3 and condition prompting circuit 4, the capacitance C1 connections at the same time for the output terminal of the latching circuit 2
Between the cathode and ground of the silicon-controlled D4.
The embodiment of the present invention also provides a kind of set-top box, and the set-top box includes overheating protection circuit as described above, institute
Stating overheating protection circuit includes：
Target temperature is sampled, if being higher than preset temperature, generates the temperature sampling trigger circuit 1 of trigger signal；
It is connected with the temperature sampling trigger circuit 1, the latching circuit 2 maintained to the trigger signal；
It is connected respectively with the latching circuit 2, power supply 12V and set-top box body, receives the trigger signal, described in cut-out
The power switch 3 that power supply 12V powers the set-top box body；
It is connected with the latching circuit 2, prompts the user with the condition prompting circuit 4 for being currently at malfunction.
Overheating protection circuit particular circuit configurations are as described above, which is not described herein again.
When complete machine temperature raises, the resistance value of thermistor R8 constantly declines, and causes the electrode input end of comparator chip U4
The sampled voltage of IN+ also increases；When the electrode input end IN+ voltages of comparator chip U4 are higher than negative input IN-'s
During predeterminated voltage, the output terminal OUT output high level of comparator chip U4, diode D7 cathodes output 12V, metal-oxide-semiconductor Q14 passes
Disconnected, system stalls, warning light LED shines, and prompts malfunction.After power-off, even if complete machine temperature declines, due to self-locking electricity
The effect on road 2, current state will not change automatically, it is necessary to after being fixed a breakdown by user, re-power, equipment could work again
Make.
In embodiments of the present invention, when set-top box temperature raises, temperature sampling trigger circuit adopts target temperature
Sample, if being higher than preset temperature, generates trigger signal, and latching circuit maintains trigger signal, and power switch receives triggering letter
Number, cut off the power and power to set-top box, while condition prompting circuit prompts the user with and is currently at malfunction, so improves
The performance of set-top box and service life.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of overheating protection circuit, it is characterised in that the overheating protection circuit includes：
Target temperature is sampled, if being higher than preset temperature, generates the temperature sampling trigger circuit of trigger signal；
It is connected with the temperature sampling trigger circuit, the latching circuit maintained to the trigger signal；
It is connected respectively with the latching circuit, power supply and electronic equipment, receives the trigger signal, cuts off the power supply to electronics
The power switch of equipment power supply；
It is connected with the latching circuit, prompts the user with the condition prompting circuit for being currently at malfunction；
The temperature sampling trigger circuit includes：
Thermistor R8, resistance R9, resistance R10, resistance R11, resistance R18, resistance R19, capacitance C7 and comparator chip U4；
The thermistor R8 and resistance R9 are connected between power supply and ground, the resistance R11 and resistance R10 be connected on power supply and
Between ground, the electrode input end IN+ of the comparator chip U4 meets the public company of thermistor R8 and resistance R9 by resistance R18
Connect end, the public connecting end of negative input the IN- connecting resistances R11 and resistance R10 of the comparator chip U4, the comparator
The power end Vdd of chip U4 connects power supply, and the capacitance C7 is connected between power end Vdd and the ground of the comparator chip U4,
The output terminal OUT of the comparator chip U4 connects the latching circuit, and the resistance R19 is connected to the comparator chip U4's
Between electrode input end IN+ and output terminal OUT；
The latching circuit includes：
Capacitance C8, capacitance C9, triode Q15, triode Q16, diode D6, diode D7, resistance R12, resistance R15, resistance
R16, resistance R17 and resistance R18；
The anode of the diode D6 meets the output terminal OUT of the comparator chip U4, and the cathode of the diode D6 passes through institute
State the base stage that resistance R12 meets the triode Q15, the emitter ground connection of the triode Q15, the capacitance C9 and resistance R16
It is connected in parallel between base stage and the ground of the triode Q15, the resistance R15 and electricity that the collector of the triode Q15 passes through series connection
Resistance R17 connects power supply, and the base stage of the triode Q15 connects the anode of the diode D7, the diode by the resistance R18
The cathode of D7 meets power switch and the condition prompting circuit, the triode Q16 at the same time for the output terminal of the latching circuit
Base stage connecting resistance R15 and resistance R17 public connecting end, the collector of the triode Q16 connects the sun of the diode D7
Pole, the emitter of the triode Q16 connect power supply, and the capacitance C8 is connected between the cathode and ground of the diode D7.
2. overheating protection circuit as claimed in claim 1, it is characterised in that the power switch includes：
Resistance R14, resistance R22, capacitance C13 and metal-oxide-semiconductor Q14；
The grid of the metal-oxide-semiconductor Q14 connects the output terminal of the latching circuit by resistance R22, and the resistance R14 is connected to described
Between the grid and ground of metal-oxide-semiconductor Q14, the source electrode of the metal-oxide-semiconductor Q14 connects power supply, and the drain electrode of the metal-oxide-semiconductor Q14 connects the electronics
Equipment, the capacitance C13 are connected between drain electrode and the ground of the metal-oxide-semiconductor Q14.
3. overheating protection circuit as claimed in claim 1, it is characterised in that the condition prompting circuit includes：
Warning light LED and resistance R9；
The warning light LED and resistance R9 are connected between the output terminal and ground of the latching circuit.
4. a kind of set-top box, it is characterised in that the set-top box is included such as claim 1-3 any one of them overtemperature protection electricity
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510728058.2A CN105226608B (en) | 2015-10-30 | 2015-10-30 | A kind of overheating protection circuit and set-top box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510728058.2A CN105226608B (en) | 2015-10-30 | 2015-10-30 | A kind of overheating protection circuit and set-top box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105226608A CN105226608A (en) | 2016-01-06 |
| CN105226608B true CN105226608B (en) | 2018-05-11 |
Family
ID=54995400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510728058.2A Active CN105226608B (en) | 2015-10-30 | 2015-10-30 | A kind of overheating protection circuit and set-top box |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610126B (en) * | 2015-12-24 | 2019-04-26 | 深圳市共进电子股份有限公司 | Network equipment overheating protection circuit |
| CN105610125B (en) * | 2015-12-24 | 2019-05-10 | 深圳市共进电子股份有限公司 | Network equipment overheating protection circuit |
| 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 |
| CN114915817B (en) * | 2022-05-18 | 2023-08-18 | 中山亿联智能科技有限公司 | Thermoelectric generator top box |
Citations (5)
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| 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 |
| CN104104064A (en) * | 2013-04-08 | 2014-10-15 | 华为终端有限公司 | Thermal protection circuit |
| CN104283181A (en) * | 2013-07-11 | 2015-01-14 | 珠海格力电器股份有限公司 | Protection Circuit of Ultrasonic Humidifier and Ultrasonic Humidifier |
| US9042069B2 (en) * | 2009-09-25 | 2015-05-26 | Autonetworks Technologies, Ltd. | Power supply controller |
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2015
- 2015-10-30 CN CN201510728058.2A patent/CN105226608B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104104064A (en) * | 2013-04-08 | 2014-10-15 | 华为终端有限公司 | Thermal protection circuit |
| CN104283181A (en) * | 2013-07-11 | 2015-01-14 | 珠海格力电器股份有限公司 | Protection Circuit of Ultrasonic Humidifier and Ultrasonic Humidifier |
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| Publication number | Publication date |
|---|---|
| CN105226608A (en) | 2016-01-06 |
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