CN202634566U - Reset control circuit and television - Google Patents
Reset control circuit and television Download PDFInfo
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- CN202634566U CN202634566U CN2012202602238U CN201220260223U CN202634566U CN 202634566 U CN202634566 U CN 202634566U CN 2012202602238 U CN2012202602238 U CN 2012202602238U CN 201220260223 U CN201220260223 U CN 201220260223U CN 202634566 U CN202634566 U CN 202634566U
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Abstract
The utility model discloses a reset control circuit and a television, wherein the rest control circuit comprises an MCU (micro control unit), an MCU reset circuit, a power supply module and an MCU reset control circuit, the MCU reset circuit is used for resetting the MCU after the MCU is electrified, the power supply module is used for providing system main voltage and system standby voltage, the MCU reset control circuit is used for detecting the main voltage power failure state of the system and controlling the MCU resetting according to the main voltage power failure state of the system, the main voltage power failure detection input end of the MCU reset control circuit is connected with a system main voltage output pin of the power supply module, the standby voltage power failure detection input end of the MCU reset control circuit is connected with a system standby voltage output pin of the power supply module, the control signal input end of the MCU reset control circuit is connected with the standby control signal output pin of the MCU, and the control signal output end of the MCU reset control circuit is connected with the reset signal input pin of the MCU. The normal turn-off of the television can be ensured, and the reliability of the television is improved.
Description
Technical field
The utility model relates to technical field of television sets, relates in particular to a kind of reset control circuit and television set.
Background technology
In the prior art, the movement circuit of television set is normally supplied power by many groups different voltages with different, for example, comprise+system's principal voltage of the system standby voltage of 5V and+12V etc.The power module of television set is when television boot-strap powers on; Normally first output system standby voltage; The MCU (Micro Control Unit, micro-control unit) of television set is resetted, after MCU resets end; Each operational module of other of television set (being each peripheral circuit of MCU) is started working, thereby accomplishes the whole boot action of television set.During television boot-strap, the electrifying timing sequence of each peripheral circuit operating voltage (being converted to by the said system principal voltage) of its MCU is controlled by above-mentioned MCU.
But, when television set shuts down, the power-off sequential of uncontrollable its power module of MCU; And generally; Because the requirement of television set low standby power loss, (+5V) load is very light, thereby makes when television set shuts down to cause its system standby voltage; The power down speed of its system standby voltage lags behind the power down speed of other voltages; Promptly in the shutdown process of television set, receive the power down of other supply power voltages of MCU control to be ahead of the power down of MCU supply power voltage in the television set, cause television set to break down.Screen flower screen during like: the data entanglement of eeprom memory, shutdown, screen flower screen crashed etc. when power supply fell experiment test temporarily.
The utility model content
The main purpose of the utility model provides a kind of reset control circuit, and the MCU that is intended to make television set can access in time in shutdown moment of television set and reset, to guarantee the normal shutdown of television set.
In order to achieve the above object; The utility model proposes a kind of reset control circuit; This reset control circuit comprises MCU, is used for MCU reset circuit, the power module that is used to provide system's principal voltage and system standby voltage that after said MCU powers on, said MCU is resetted, the power-down state that is used to detect said system principal voltage; And control the MCU reset control circuit that said MCU resets according to said power-down state, wherein:
The principal voltage detection of power loss input of said MCU reset control circuit is connected with system's principal voltage output pin of said power module; The standby voltage detection of power loss input of said MCU reset control circuit is connected with the system standby voltage output pin of said power module; The signal input end of said MCU reset control circuit is connected with the Opportunity awaiting control for linear signal output pin of said MCU, and the control signal output ends of said MCU reset control circuit is connected with the reset signal input pin of said MCU.
Preferably, said MCU reset control circuit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, first electric capacity, triode, first diode and second diode; Wherein:
One end of first resistance is connected with system's principal voltage output pin of said power module; The other end of first resistance is through second grounding through resistance, and warp the 3rd resistance is connected the grounded emitter of said triode with the base stage of said triode; One end of the 4th resistance is connected with the system standby voltage output pin of said power module; The other end of the 4th resistance is connected with the collector electrode of triode, and is connected with the anode of first diode, and the anode of first diode also is connected with the anode of second diode; The negative electrode of first diode is connected with the Opportunity awaiting control for linear signal output pin of MCU; And be connected with an end of first electric capacity through the 5th resistance, the other end of first electric capacity is connected with the base stage of triode, and the negative electrode of second diode is connected with the reset signal input pin of MCU.
Preferably, said MCU reset control circuit also comprises second electric capacity, and an end of said second electric capacity is connected between the anode of anode and said second diode of said first diode, the other end ground connection of said second electric capacity.
Preferably, said MCU reset control circuit also comprises voltage stabilizing didoe, and said voltage stabilizing didoe is parallelly connected with said first resistance, and its negative electrode is connected with system's principal voltage output pin of said power module, and its anode is through said second grounding through resistance.
Preferably; The system standby voltage output pin of said power module also is connected with the power supply input pin of said MCU and the power input of said MCU reset circuit respectively; The Opportunity awaiting control for linear signal output pin of said MCU also is connected with the control signal input pin of said power module, and the reset signal output of said MCU reset circuit is connected with the reset signal input pin of said MCU.
Preferably, said triode is the NPN triode.
The utility model also proposes a kind of television set; Said television set comprises reset control circuit; Said reset control circuit comprises MCU, is used for MCU reset circuit, the power module that is used to provide system's principal voltage and system standby voltage that after said MCU powers on, said MCU is resetted, the power-down state that is used to detect said system principal voltage; And control the MCU reset control circuit that said MCU resets according to said power-down state, wherein:
The principal voltage detection of power loss input of said MCU reset control circuit is connected with system's principal voltage output pin of said power module; The standby voltage detection of power loss input of said MCU reset control circuit is connected with the system standby voltage output pin of said power module; The signal input end of said MCU reset control circuit is connected with the Opportunity awaiting control for linear signal output pin of said MCU, and the control signal output ends of said MCU reset control circuit is connected with the reset signal input pin of said MCU.
The reset control circuit that the utility model proposes, the power-down state of system's principal voltage of its power module when detecting the television set shutdown through a MCU reset control circuit, and according to the power-down state of power module system principal voltage, the MCU of control television set in time resets.The utility model can make the MCU of television set when television set shuts down, in time resetted; Thereby make in the shutdown process of television set; Not only avoid the entanglement phenomenon and the screen flower screen phenomenon of its eeprom memory data, but also avoided when the power supply of television set falls experiment test temporarily, occurring the problem that screen flower screen crashes.Be the normal shutdown that the utility model can guarantee television set, thereby promoted the reliability of television set, simultaneously, also strengthened the collocation flexibility of TV set power module and its movement.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model reset control circuit preferred embodiment.
The realization of the utility model purpose, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
Embodiment
Further specify the technical scheme of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 is the electrical block diagram of the utility model reset control circuit preferred embodiment.
With reference to Fig. 1, the utility model reset control circuit comprises power module 101, MCU 102, MCU reset circuit 103 and MCU reset control circuit 104.
Wherein, power module 101 is used to provide system's principal voltage and system standby voltage; MCU reset circuit 103 is used for after MCU 102 powers on, MCU 102 being resetted; MCU reset control circuit 104 is used to detect the power-down state of system's principal voltage of power module 101, and resets according to the power-down state control MCU 102 of system's principal voltage of power module 101.
Particularly; The system standby voltage output pin STB of power module 101 is connected with the power supply input pin VCC of MCU 102 and the power input of MCU reset circuit 103; The Opportunity awaiting control for linear signal output pin of MCU 102 is connected with the control signal input pin of power module 101, and the reset signal output of MCU reset circuit 103 is connected with the reset signal input pin RST of MCU.The principal voltage detection of power loss input of MCU reset control circuit 104 is connected with the principal voltage output pin V1 of system of power module 101; The standby voltage detection of power loss input of MCU reset control circuit 104 is connected with the system standby voltage output pin STB of power module 101; The signal input end of MCU reset control circuit 104 is connected with the Opportunity awaiting control for linear signal output pin of MCU 102; The control signal output ends of MCU reset control circuit 104 is connected with the reset signal output of MCU reset circuit 103, and is connected with the reset signal input pin RST of MCU 102.
Wherein, above-mentioned MCU reset control circuit 104 comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, voltage stabilizing didoe ZD1, first capacitor C 1, second capacitor C 2, triode Q1, the first diode D1 and the second diode D2.Triode Q1 among the utility model embodiment is the NPN triode.
Particularly; One end of first resistance R 1 is the principal voltage detection of power loss input of MCU reset control circuit 104; Be connected with the principal voltage output pin V1 of system of power module 101, the other end of first resistance R 1 is through second resistance R, 2 ground connection, and warp the 3rd resistance R 3 is connected with the base stage of triode Q1; Voltage stabilizing didoe ZD1 is parallelly connected with first resistance R 1; The negative electrode of voltage stabilizing didoe ZD1 is connected with the principal voltage output pin V1 of system of power module 101, and the anode of voltage stabilizing didoe ZD1 is through second resistance R, 2 ground connection, the grounded emitter of triode Q1;
One end of the 4th resistance R 4 is the standby voltage detection of power loss input of MCU reset control circuit 104; Be connected with the system standby voltage output pin STB of power module 101; The other end of the 4th resistance R 4 is connected with the collector electrode of triode Q1; And be connected with the anode of the first diode D1, the anode of the first diode D1 also is connected with the anode of the second diode D2;
The negative electrode of the first diode D1 is the signal input end of MCU reset control circuit 104; Be connected with the Opportunity awaiting control for linear signal output pin of MCU 102; And be connected with an end of first capacitor C 1 through the 5th resistance R 5; The other end of first capacitor C 1 is connected with the base stage of triode Q1, and an end of second capacitor C 2 is connected between the anode of anode and the second diode D2 of the first diode D1, the other end ground connection of second capacitor C 2;
The negative electrode of the second diode D2 is the control signal output ends of MCU reset control circuit 104, is connected with the reset signal input pin RST of MCU 102.
Above-mentioned MCU reset circuit 103 comprises the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the 3rd capacitor C 3, the 3rd diode D3, the 4th diode D4, triode Q2, polar capacitor E1 and polar capacitor E2.Wherein, triode Q2 is the PNP triode.
Particularly, the anode of the 3rd diode D3 is connected with the negative electrode of the 4th diode D4, and is connected with the system standby voltage output pin STB of power module 101; One end of the 6th resistance R 6 is connected between the negative electrode of anode and the 4th diode D4 of the 3rd diode D3; The other end of the 6th resistance R 6 is connected with the anode of the 4th diode D4, and is connected with the base stage of triode Q2 through the 7th resistance R 7, and the emitter of triode Q2 is connected with the negative electrode of the 3rd diode D3; And be connected with the positive pole of polar capacitor E2; The minus earth of polar capacitor E2, the positive pole of polar capacitor E1 is connected with the anode of the 4th diode D4, the minus earth of polar capacitor E1; The collector electrode of triode Q2 is connected with the reset signal input pin RST of MCU 102 through the 8th resistance R 8; The collector electrode of triode Q2 also is connected with an end of the 9th resistance R 9, the other end ground connection of the 9th resistance R 9, and warp the 3rd capacitor C 3 is connected with the reset signal input pin RST of MCU 102.
The operation principle of the utility model reset control circuit specifically describes as follows:
(1) behind television boot-strap; Power module 101 is at first from the system standby voltage of its system standby voltage output pin STB output+5V; Should+the system standby voltage of 5V is that MCU 102 and MCU reset circuit 103 provide operating voltage; The reset signal SYS_RST of a high level of reset signal output output of MCU reset circuit 103, the reset signal SYS_RST of this high level inputs to the reset signal input pin RST of MCU 102, and MCU 102 is resetted; After treating the homing action end of MCU 102; MCU 102 gets into normal operating conditionss, and from the Opportunity awaiting control for linear signal STB_CTR of a high level of its Opportunity awaiting control for linear signal output pin output, the Opportunity awaiting control for linear signal STB_CTR of this high level exports the control signal input pin of power module 101 to; After power module 101 receives the Opportunity awaiting control for linear signal STB_CTR of this high level; Output system's principal voltage of+12, system's principal voltage that should+12 through the correspondent voltage conversion after for MCU 102 each peripheral circuit provide operating voltage, television set is carried out boot action.
Wherein, The Opportunity awaiting control for linear signal STB_CTR of above-mentioned high level is except exporting power module 101 (with control power module 101 output system principal voltages) to; Also export the signal input end of MCU reset control circuit 104 to; The i.e. negative electrode of the first diode D1; The negative electrode that makes the diode D1 that wins is a high level, and the Opportunity awaiting control for linear signal STB_CTR of this high level makes triode Q1 conducting through the 5th resistance R 5 and first capacitor C 1 (delay circuit), up to power module 101 output+after system's principal voltage of 12V is normal; Through the dividing potential drop of first resistance R 1 or the voltage stabilizing didoe ZD1 and second resistance R 2, make triode Q1 keep conducting state through the 3rd resistance R 3.And the conducting of triode Q1 with making the current potential of its collector electrode remain low level, thereby makes that the anode of the second diode D2 is a low level, and the second diode D2 ends.In like manner, the conducting of triode Q1 is a low level with the anode that makes the diode D1 that wins, and the first diode D1 ends.Promptly in the start process of television set, 104 pairs of MCU reset circuits of MCU reset control circuit 103 do not have influence, and television set is in normal open state.
(2) if television set when open state, MCU 102 receives user's standby command, then MCU 102 is with the Opportunity awaiting control for linear signal STB_CTR of output low level.This low level Opportunity awaiting control for linear signal STB_CTR exports the control signal input pin of power module 101 to, makes power module 101 stop+output of system's principal voltage of 12V, thereby makes the triode Q1 in the MCU reset control circuit 104 end.And; Because above-mentioned low level Opportunity awaiting control for linear signal STB_CTR also exports the signal input end of MCU reset control circuit 104 to, i.e. the negative electrode of the first diode D1, the negative electrode that makes the diode D1 that wins is a low level; Thereby make the collector electrode of triode Q1 be clamped at about 0.7V; Promptly the voltage of the anode of the second diode D2 is about 0.7V, because diode has the characteristic of 0.7V constant-pressure drop, makes the second diode D2 of this moment still be in cut-off state.Promptly when television set became holding state by open state, 104 pairs of MCU reset circuits 103 of MCU reset control circuit did not still have influence, and television set can be in normal holding state.
(3) when television set shuts down; System's principal voltage of+12V is because load is heavier; Its power down speed is very fast; When system's principal voltage power down to the predeterminated voltage value of+12V (this predeterminated voltage value can through the parameter adjustment of first resistance R 1, voltage stabilizing didoe ZD1 and second resistance R 2), the triode Q1 in the MCU reset control circuit 104 ends.Because the load of the system standby voltage of+5V is very light; Therefore, in the moment of television set shutdown, MCU 102 is still in running order; It still exports the Opportunity awaiting control for linear signal STB_CTR of high level; The not power down of system standby voltage of+5V, thus the negative electrode of the first diode D1 is a high level in the MCU reset control circuit 104, and the first diode D1 ends.When triode Q1 and the first diode D1 are cut-off state; Above-mentioned not power down+the system standby voltage of 5V still can provide a high level signal to the collector electrode of triode Q1 and the anode of the second diode D2 through the 4th resistance R 4; Make the second diode D2 change conducting state into by the cut-off state under above-mentioned (1), (2) situation; And the conducting of the second diode D2; With making that the reset signal SYS_RST of reset signal output of MCU reset circuit 103 is a high level, promptly the reset signal input pin of MCU 102 is a high level, and MCU 102 is resetted; Thereby make the MCU 102 of television set and other peripheral circuits of television set quit work simultaneously, make television set obtain normal shutdown.
The utility model reset control circuit, the power-down state of system's principal voltage of its power module when detecting the television set shutdown through a MCU reset control circuit, and according to the power-down state of power module system principal voltage, the MCU of control television set in time resets.The utility model can make the MCU of television set when television set shuts down, in time resetted; Thereby make in the shutdown process of television set; Not only avoid the entanglement phenomenon and the screen flower screen phenomenon of its eeprom memory data, but also avoided when the power supply of television set falls experiment test temporarily, occurring the problem that screen flower screen crashes.Be the normal shutdown that the utility model can guarantee television set, thereby promoted the reliability of television set, simultaneously, also strengthened the collocation flexibility of TV set power module and its movement.
The utility model also proposes a kind of television set, and this television set comprises reset control circuit, and the circuit structure of its reset control circuit is identical with the circuit structure of the described reset control circuit of top embodiment, repeats no more here.
The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (7)
1. reset control circuit; Comprise MCU, be used for MCU reset circuit that after said MCU powers on, said MCU is resetted and the power module that is used to provide system's principal voltage and system standby voltage; It is characterized in that; Also comprise: be used to detect the power-down state of said system principal voltage, and control the MCU reset control circuit that said MCU resets according to said power-down state, wherein:
The principal voltage detection of power loss input of said MCU reset control circuit is connected with system's principal voltage output pin of said power module; The standby voltage detection of power loss input of said MCU reset control circuit is connected with the system standby voltage output pin of said power module; The signal input end of said MCU reset control circuit is connected with the Opportunity awaiting control for linear signal output pin of said MCU, and the control signal output ends of said MCU reset control circuit is connected with the reset signal input pin of said MCU.
2. reset control circuit according to claim 1; It is characterized in that said MCU reset control circuit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, first electric capacity, triode, first diode and second diode; Wherein:
One end of first resistance is connected with system's principal voltage output pin of said power module; The other end of first resistance is through second grounding through resistance, and warp the 3rd resistance is connected the grounded emitter of said triode with the base stage of said triode; One end of the 4th resistance is connected with the system standby voltage output pin of said power module; The other end of the 4th resistance is connected with the collector electrode of triode, and is connected with the anode of first diode, and the anode of first diode also is connected with the anode of second diode; The negative electrode of first diode is connected with the Opportunity awaiting control for linear signal output pin of said MCU; And be connected with an end of first electric capacity through the 5th resistance, the other end of first electric capacity is connected with the base stage of triode, and the negative electrode of second diode is connected with the reset signal input pin of said MCU.
3. reset control circuit according to claim 2; It is characterized in that; Said MCU reset control circuit also comprises second electric capacity, and an end of said second electric capacity is connected between the anode of anode and said second diode of said first diode, the other end ground connection of said second electric capacity.
4. reset control circuit according to claim 3; It is characterized in that; Said MCU reset control circuit also comprises voltage stabilizing didoe; Said voltage stabilizing didoe is parallelly connected with said first resistance, and its negative electrode is connected with system's principal voltage output pin of said power module, and its anode is through said second grounding through resistance.
5. reset control circuit according to claim 1; It is characterized in that; The system standby voltage output pin of said power module also is connected with the power supply input pin of said MCU and the power input of said MCU reset circuit respectively; The Opportunity awaiting control for linear signal output pin of said MCU also is connected with the control signal input pin of said power module, and the reset signal output of said MCU reset circuit is connected with the reset signal input pin of said MCU.
6. reset control circuit according to claim 2 is characterized in that, said triode is the NPN triode.
7. a television set is characterized in that, comprises each described reset control circuit among the claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202602238U CN202634566U (en) | 2012-06-04 | 2012-06-04 | Reset control circuit and television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202602238U CN202634566U (en) | 2012-06-04 | 2012-06-04 | Reset control circuit and television |
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| CN202634566U true CN202634566U (en) | 2012-12-26 |
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| CN2012202602238U Expired - Fee Related CN202634566U (en) | 2012-06-04 | 2012-06-04 | Reset control circuit and television |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103905756A (en) * | 2014-03-26 | 2014-07-02 | 深圳创维－Rgb电子有限公司 | Television set failure processing device and television set |
| CN106292987A (en) * | 2016-08-09 | 2017-01-04 | 浪潮(北京)电子信息产业有限公司 | A kind of processor power-off sequential control system and method |
| CN107426619A (en) * | 2017-01-26 | 2017-12-01 | 青岛海信电器股份有限公司 | Intelligent television and its under-voltage protection fault-tolerance approach |
| CN108153607A (en) * | 2018-02-01 | 2018-06-12 | 深圳市世纪天元科技有限公司 | Circuit is repaired in a kind of system crash automatically |
| CN110244830A (en) * | 2018-09-05 | 2019-09-17 | 浙江大华技术股份有限公司 | A kind of control circuit and its control method powered on for hard disk |
| CN110648635A (en) * | 2019-10-31 | 2020-01-03 | 京东方科技集团股份有限公司 | Backlight closing circuit and display device |
| CN112578888A (en) * | 2020-12-08 | 2021-03-30 | 宁波厚德能源科技有限公司 | Singlechip is reset circuit independently |
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2012
- 2012-06-04 CN CN2012202602238U patent/CN202634566U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103905756A (en) * | 2014-03-26 | 2014-07-02 | 深圳创维－Rgb电子有限公司 | Television set failure processing device and television set |
| CN103905756B (en) * | 2014-03-26 | 2017-02-01 | 深圳创维－Rgb电子有限公司 | Television set failure processing device and television set |
| CN106292987A (en) * | 2016-08-09 | 2017-01-04 | 浪潮(北京)电子信息产业有限公司 | A kind of processor power-off sequential control system and method |
| CN106292987B (en) * | 2016-08-09 | 2019-03-15 | 浪潮(北京)电子信息产业有限公司 | A kind of processor power-off sequential control system and method |
| CN107426619A (en) * | 2017-01-26 | 2017-12-01 | 青岛海信电器股份有限公司 | Intelligent television and its under-voltage protection fault-tolerance approach |
| CN107426619B (en) * | 2017-01-26 | 2019-12-06 | 青岛海信电器股份有限公司 | Intelligent television and undervoltage protection fault-tolerant method thereof |
| CN108153607A (en) * | 2018-02-01 | 2018-06-12 | 深圳市世纪天元科技有限公司 | Circuit is repaired in a kind of system crash automatically |
| CN110244830A (en) * | 2018-09-05 | 2019-09-17 | 浙江大华技术股份有限公司 | A kind of control circuit and its control method powered on for hard disk |
| CN110244830B (en) * | 2018-09-05 | 2022-06-07 | 浙江大华技术股份有限公司 | Control circuit for hard disk power-on and control method thereof |
| CN110648635A (en) * | 2019-10-31 | 2020-01-03 | 京东方科技集团股份有限公司 | Backlight closing circuit and display device |
| CN112578888A (en) * | 2020-12-08 | 2021-03-30 | 宁波厚德能源科技有限公司 | Singlechip is reset circuit independently |
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