CN101753927A - Delayed switching circuit and control method thereof - Google Patents
Delayed switching circuit and control method thereof Download PDFInfo
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- CN101753927A CN101753927A CN200810241490A CN200810241490A CN101753927A CN 101753927 A CN101753927 A CN 101753927A CN 200810241490 A CN200810241490 A CN 200810241490A CN 200810241490 A CN200810241490 A CN 200810241490A CN 101753927 A CN101753927 A CN 101753927A
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- 230000003111 delayed effect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000012544 monitoring process Methods 0.000 claims abstract description 31
- 230000000087 stabilizing effect Effects 0.000 claims description 18
- 230000015556 catabolic process Effects 0.000 claims description 7
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 7
- 238000013461 design Methods 0.000 abstract description 7
- 206010027336 Menstruation delayed Diseases 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 3
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Abstract
The embodiment of the invention discloses a delayed switching circuit control method which includes the steps of: receiving a standby instruction; monitoring the voltage on the standby circuit when the standby instruction is received; generating a standby switching signal when the monitored voltage of the standby circuit drops to the preset threshold value; and according to the standby switching signal generated, controlling the switch to switch to the standby circuit from the current working circuit. The embodiment of the invention further discloses a delayed switching circuit. With the embodiments of the invention, when an electrical device with startup/standby function receives a standby instruction, the standby instruction controls the voltage of the standby circuit to drop, and when the monitored voltage on the standby circuit drops to the preset threshold value after a time-delayed period, the circuitry is controlled to switch from the current working circuit to the standby circuit, so that the input voltage of a DC-DC converter is lower. Therefore, the DC-DC converter with cheap price and low withstand voltage can be used, which is good for design of low-cost electrical devices.
Description
Technical field
The present invention relates to electronic circuit field, relate in particular to a kind of delayed switching circuit and control method thereof.
Background technology
Power circuit is when standby in present most of television set, and all more than 9W, waste of energy is more serious for television set power.Be energy savings, promote whole TV industry and improve energy-saving design, country has released the green power supply authentication system, stand-by power consumption to all television sets adopts forcible authentication, the requirement standby power must be less than 9W, in order to encourage complete machine manufacturer to carry out energy-saving design,, will allow on this type, to mark energy-saving sign simultaneously to the type of stand-by power consumption less than 3W.For realizing the purpose of standby low-power consumption, present most of television set is when standby, can will switch to reference voltage than higher sound accompaniment voltage, handoff procedure adopts DC-DC (Direct Current-Direct Current, DC-to-DC) transducer is realized, promptly after the standby commutation circuit, connect a DC-DC transducer, thus the low-voltage the when high voltage drop during with the television set operate as normal is low to moderate standby, to reach the purpose that reduces power consumption.
The inventor is in realizing process of the present invention, find in the present DC-DC transducer, the universal demand input voltage is lower, but switching moment because the voltage of sound accompaniment one tunnel does not also lower, there is the possibility of damaging the DC-DC transducer in the input voltage that can cause the DC-DC transducer greater than its device specification requirement.Withstand voltage its price is higher than higher DC-DC transducer though have, and is unfavorable for the design of low-cost electric equipment.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the embodiment of the invention provides a kind of delayed switching circuit and control method thereof, after receiving standby command, switches on the stand-by circuit by the voltage cut-out on the monitoring stand-by circuit.
In order to address the above problem, the embodiment of the invention provides a kind of delayed switching circuit control method, comprising:
Receive standby command;
When receiving described standby command, the voltage on the monitoring stand-by circuit;
When the voltage on monitoring described stand-by circuit drops to predetermined threshold value, generate the standby switching signal;
Switch on the stand-by circuit according to the standby switching signal control switch of described generation operating circuit by current place.
Correspondingly, the embodiment of the invention provides a kind of delayed switching circuit, comprising:
The standby command receiver module is used to receive standby command;
The voltage monitoring module is used for when described standby command receiver module receives standby command, the voltage on the monitoring stand-by circuit;
The switching signal generation module is used for when the voltage of described voltage monitoring module monitors to described stand-by circuit drops to predetermined threshold value, generates the standby switching signal;
Switch control module is used for the standby switching signal control switch that generates according to described switching signal generation module and switches to stand-by circuit by the operating circuit at current place.
Implement the embodiment of the invention, after the electric equipment with start/idle function is receiving standby command, voltage on this standby command control stand-by circuit begins to descend, when the voltage on monitoring stand-by circuit drops to predetermined threshold value through one section time delay, generate the standby switching signal, control circuit is switched on the stand-by circuit by the operating circuit at current place, make the voltage that is input on the DC_DC lower, therefore can use low-cost withstand voltage low DC-DC transducer, be beneficial to the design of low-cost electric equipment, and sampling voltage is higher during because of standby, and the voltage of system is lower when being stabilized to same voltage, and therefore lower stand-by power consumption is arranged.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the delayed switching circuit control method flow chart in the embodiment of the invention;
Fig. 2 is the delayed switching circuit structure chart in the embodiment of the invention;
Fig. 3 is the delayed switching circuit schematic diagram in the embodiment of the invention;
Fig. 4 is the delayed switching circuit figure in the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Referring to Fig. 1, the delayed switching circuit control method flow chart in the embodiment of the invention specifically comprises:
S101, reception standby command.
During specific implementation, in having the electric equipment of start/idle function, (the Central Process Unit of CPU in the delayed switching circuit receiving circuit chip, the instruction of CPU) sending, when entering holding state, CPU sends high level standby command STANDBY, produces low level POWER, promptly receives standby command; When entering open state, CPU sends low level standby command STANDBY, produces high level POWER, promptly receives start-up command.
S102, when receiving standby command, the voltage of monitoring on the stand-by circuit.
During specific implementation, utilize voltage stabilizing didoe to realize the monitoring of the voltage on the stand-by circuit in the present embodiment.
When receiving standby command among the step S101, when this delayed switching circuit produced low level POWER, the voltage on the stand-by circuit began to descend.When the voltage on stand-by circuit does not drop to predetermined threshold value as yet, this voltage stabilizing didoe is in conducting state always, be that the operating state of described delayed switching circuit is the same during with normal operating conditions, but when the voltage on the stand-by circuit drops to predetermined threshold value, this voltage stabilizing didoe place circuit opens circuit immediately, and voltage no longer is provided.
When utilizing voltage stabilizing didoe to realize the monitoring of the voltage on the stand-by circuit, the predetermined threshold value in this step is the critical reverse breakdown voltage of voltage stabilizing didoe.
S103, when the voltage on monitoring described stand-by circuit drops to predetermined threshold value, generate the standby switching signal.
During specific implementation,, when the voltage on monitoring stand-by circuit drops to predetermined threshold value, generate the standby switching signal according to the low level POWER that produces among the step S102.Promptly, generate the standby switching signal when voltage stabilizing didoe no longer during conducting.
S104, switch on the stand-by circuit according to the operating circuit of the standby switching signal control switch that generates by current place.
During specific implementation, when receiving start-up command, select the output voltage of operation circuit voltage, be input in the DC-DC transducer of this delayed switching circuit connection as this delayed switching circuit according to the start switching signal control switch that generates among the step S103; When receiving standby command, according to the voltage on the standby switching signal control switch selection stand-by circuit that generates among the step S103, voltage on the stand-by circuit of promptly selecting to make voltage stabilizing didoe can not continue conducting exports in the DC-DC transducer of this delayed switching circuit connection as the output voltage of this delayed switching circuit.
The critical reverse breakdown voltage of voltage stabilizing didoe can be that the default maximum of DC-DC transducer allows input voltage among the step S102.
Implement the embodiment of the invention, after the electric equipment with start/idle function is receiving standby command, voltage on this standby command control stand-by circuit begins to descend, when the voltage on monitoring stand-by circuit drops to predetermined threshold value through one section time delay, generate the standby switching signal, control circuit is switched on the stand-by circuit by the operating circuit at current place, make the voltage that is input on the DC-DC lower, therefore can use low-cost withstand voltage low DC-DC transducer, be beneficial to the design of low-cost electric equipment, and the sampling voltage during because of standby is higher, and the voltage of system is lower when being stabilized to same voltage, and therefore lower stand-by power consumption is arranged.
Referring to Fig. 2, be the delayed switching circuit schematic diagram in the embodiment of the invention.
Delayed switching circuit in the present embodiment mainly comprises standby command receiver module 21, voltage monitoring module 22, switching signal generation module 23, switch control module 24 and voltage output module 25.
Wherein, standby command receiver module 21 is used to receive standby command;
Voltage monitoring module 22 is used for when standby command receiver module 21 receives standby command, the voltage on the monitoring stand-by circuit, and when specifically implementing, described voltage monitoring module 22 can be voltage stabilizing didoe;
Switching signal generation module 23 is used for monitoring voltage on the stand-by circuit when dropping to predetermined threshold value when voltage monitoring module 22, generates the standby switching signal;
Preferably, this delayed switching circuit also comprises voltage output module 25, is used for exporting the voltage on the described stand-by circuit to the DC-DC transducer after described switch control module 24 switches to the operating circuit at current place on the stand-by circuit.
Referring to Fig. 3, be the delayed switching circuit schematic diagram in the embodiment of the invention.
During specific implementation, when the electric equipment with start/idle function entered holding state, CPU sent a control command POWER, and the voltage of controlling simultaneously on the stand-by circuit begins to descend, and began to monitor the voltage on the stand-by circuit.When the voltage on monitoring stand-by circuit drops to predetermined threshold value, generate the standby switching signal, control switch is switched on the stand-by circuit by the operating circuit at current place, and the voltage on the described stand-by circuit is outputed to the DC-DC transducer.
Referring to Fig. 4, be the delayed switching circuit figure in the embodiment of the invention.
During specific implementation, this circuit is applied in the television set, and voltage stabilizing didoe VD106 is used to monitor standby voltage, and triode V966, V967, V968 are equivalent to the selector switch of input voltage, be used to control the voltage of selecting on the cut-in operation circuit, or insert the voltage on the stand-by circuit.This delayed switching circuit has the input of two-way voltage in the time of in working order, one the tunnel is the input voltage of 14V, another road is the input voltage of 26V, when television set enters holding state, CPU in the television set receives low level POWER standby command, CPU is sent to delayed switching circuit with this standby command, though this moment, POWER was low, but because the critical reverse breakdown voltage of voltage stabilizing didoe VD106 is 15V, the input at 26V voltage place, current place is the voltage input end after switching, it is the voltage input end of stand-by circuit, and the voltage on the stand-by circuit can not drop to 15V from 26V voltage quickly, therefore triode V968 is in conducting all the time, triode V967 disconnects, and triode V966 disconnects.Before 26V does not drop to critical reverse breakdown voltage, also do not switch to stand-by circuit, voltage on the stand-by circuit can't be supplied with input voltage to DC-DC, when 26V drops to critical reverse breakdown voltage, triode V968 disconnects, triode V967 conducting, triode V966 conducting, therefore stand-by circuit is connected, and promptly the operating circuit at current place switches on the stand-by circuit.
According to the high-low level value of POWER signal, and the voltage monitoring situation of voltage stabilizing didoe, can form voltage as shown in table 1 and insert situation.
Table 1 voltage is selected situation
| ??POWER | Voltage detecting | Switch is selected | |
| Normal operating conditions | ??1 | ??1 | Operating circuit |
| Start shooting moment | ??1 | ??0 | Operating circuit |
| Standby moment | ??0 | ??1 | Operating circuit |
| Normal holding state | ??0 | ??0 | Stand-by circuit |
In the table 1, POWER is high level POWER for the access of " 1 " expression delayed switching circuit, and for the access of " 0 " expression delayed switching circuit is low level POWER; Voltage monitoring is in conducting state for " 1 " expression voltage stabilizing didoe, for " 0 " expression voltage stabilizing didoe is in off state; Switch is chosen as " operating circuit " expression control switch and is connected to operating circuit, for " stand-by circuit " expression control switch is connected to stand-by circuit.The state of the level value that exemplifies in the table 1 to the specifying of present embodiment, is not the qualification to summary of the invention just.
In sum, delayed switching circuit that the embodiment of the invention provides and control method thereof, after the electric equipment with start/idle function is receiving standby command, voltage on this standby command control stand-by circuit begins to descend, when the voltage on the monitoring band stand-by circuit drops to predetermined threshold value through one section time delay, generate the standby switching signal, control circuit is switched on the stand-by circuit by the operating circuit at current place, make the voltage that is input on the DC-DC lower, therefore can use low-cost withstand voltage low DC-DC transducer, be beneficial to the design of low-cost electric equipment, and the sampling voltage during because of standby is higher, the voltage of system is lower when being stabilized to same voltage, and therefore lower stand-by power consumption is arranged.
Above disclosed is a kind of preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (8)
1. a delayed switching circuit control method is characterized in that, comprising:
Receive standby command;
When receiving described standby command, the voltage on the monitoring stand-by circuit;
When the voltage on monitoring described stand-by circuit drops to predetermined threshold value, generate the standby switching signal;
Switch on the stand-by circuit according to the standby switching signal control switch of described generation operating circuit by current place.
2. the method for claim 1 is characterized in that, the voltage on the described stand-by circuit of described monitoring is specially:
Utilize voltage stabilizing didoe to monitor voltage on the described stand-by circuit.
3. method as claimed in claim 2 is characterized in that:
Described predetermined threshold value is specially the critical reverse breakdown voltage of described voltage stabilizing didoe.
4. method as claimed in claim 3 is characterized in that, comprises after described standby switching signal control switch according to described generation switches on the stand-by circuit by the operating circuit at current place:
Export the voltage on the described stand-by circuit to DC-to-DC converter.
5. method as claimed in claim 4 is characterized in that:
The maximum that the critical reverse breakdown voltage of described voltage stabilizing didoe is specially described DC-to-DC converter allows input voltage.
6. a delayed switching circuit is characterized in that, comprising:
The standby command receiver module is used to receive standby command;
The voltage monitoring module is used for when described standby command receiver module receives standby command, the voltage on the monitoring stand-by circuit;
The switching signal generation module is used for when the voltage of described voltage monitoring module monitors to described stand-by circuit drops to predetermined threshold value, generates the standby switching signal;
Switch control module is used for the standby switching signal control switch that generates according to described switching signal generation module and switches to stand-by circuit by the operating circuit at current place.
7. circuit as claimed in claim 6 is characterized in that:
Described voltage monitoring module is a voltage stabilizing didoe.
8. as claim 6 or 7 described circuit, it is characterized in that described circuit comprises:
The voltage output module is used for exporting the voltage on the described stand-by circuit to DC-to-DC converter after described switch control module switches to the operating circuit at current place on the stand-by circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102414909A CN101753927B (en) | 2008-12-22 | 2008-12-22 | Delayed switching circuit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102414909A CN101753927B (en) | 2008-12-22 | 2008-12-22 | Delayed switching circuit and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101753927A true CN101753927A (en) | 2010-06-23 |
| CN101753927B CN101753927B (en) | 2012-03-21 |
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|---|---|---|---|
| CN2008102414909A Active CN101753927B (en) | 2008-12-22 | 2008-12-22 | Delayed switching circuit and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860207A (en) * | 2010-06-01 | 2010-10-13 | 康佳集团股份有限公司 | Switch power supply circuit and control circuit connected with 5V output end of switch power supply circuit |
| CN112559418A (en) * | 2020-12-07 | 2021-03-26 | 天津津航计算技术研究所 | JTAG switching circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100393117C (en) * | 2004-02-06 | 2008-06-04 | 深圳创维－Rgb电子有限公司 | Turning-off delay circuit for video apparatus |
| CN2831648Y (en) * | 2005-11-04 | 2006-10-25 | 海信集团有限公司 | Standby control circuit of TV set |
| CN2935671Y (en) * | 2006-06-30 | 2007-08-15 | 康佳集团股份有限公司 | TV switch power circuit |
| CN200941659Y (en) * | 2006-08-28 | 2007-08-29 | 海信集团有限公司 | TV set having low power consumption standby circuit |
-
2008
- 2008-12-22 CN CN2008102414909A patent/CN101753927B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860207A (en) * | 2010-06-01 | 2010-10-13 | 康佳集团股份有限公司 | Switch power supply circuit and control circuit connected with 5V output end of switch power supply circuit |
| CN112559418A (en) * | 2020-12-07 | 2021-03-26 | 天津津航计算技术研究所 | JTAG switching circuit |
| CN112559418B (en) * | 2020-12-07 | 2022-10-14 | 天津津航计算技术研究所 | JTAG switching circuit |
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| Publication number | Publication date |
|---|---|
| CN101753927B (en) | 2012-03-21 |
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