CN104601911B - A kind of control circuit - Google Patents
A kind of control circuit Download PDFInfo
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- CN104601911B CN104601911B CN201510043365.7A CN201510043365A CN104601911B CN 104601911 B CN104601911 B CN 104601911B CN 201510043365 A CN201510043365 A CN 201510043365A CN 104601911 B CN104601911 B CN 104601911B
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Abstract
The embodiment of the invention discloses a kind of control circuit, the first input end of the first rectification module is connected with live wire, the second input is connected with zero line, output end connection stand-by circuit；The first input end of second rectification module is connected with live wire, the second input is connected with zero line, and output end is connected by isolation module with standby control module；Isolation module is used for when live wire disconnects, and the ground of the second rectification module is isolated with the ground of control module；The embodiment of the present invention is by setting isolation module, it is isolated the ground of the second rectification module and the ground of control module, after live wire disconnects, although powered on zero line, isolated by the ground of the second rectification module is isolated device with the ground of standby control module, the second rectification module can not establish loop by Y capacitance to export DC level, and then make it that the uncontrollable stand-by circuit of standby control module is in running order, therefore, after live wire is disconnected, the standby indicating lamp in stand-by circuit can be extinguished immediately.
Description
Technical field
The present invention relates to field of circuit technology, more particularly to a kind of control circuit.
Background technology
TV domain at present, extra-thin product are favored by consumers in general very much, and each large manufacturer makes great efforts development
Direction, ultra-thin single knife switch is also into the priority scheme of structure design.To meet the requirement of the low standby power loss of state compulsion
(<0.5W), TV power supply scheme both increases special stand-by circuit, and traditional complete machine power-supply system is as shown in Figure 1.
However, in traditional complete machine power-supply system, by taking TV as an example, by existing power standby control circuit and hilted broadsword
After power switch is used cooperatively, when disconnecting single knife switch in the standby state, power supply L lines are disconnected, and N lines are still powered and pass through
It is carried in after rectification on readiness control circuit.Because the primary of ground and whole circuit of control circuit is connected, electric current can pass through
Y capacitance in filter circuit flows to secondary, so as to form loop, makes readiness control circuit in running order, causes to treat electromechanics
Road still can be with normal work, untill by depositing in the big electrochemical capacitor in rectification circuit, electric consumption falls, its external manifestation
After television shutdown, standby indicating lamp can not be extinguished, it is necessary to continue to extinguish for tens of seconds, so that consumer can not sentence immediately
Power-off has influence on Consumer's Experience depending on whether having been switched off.
The content of the invention
The embodiment of the present invention provides a kind of control circuit, after realizing and solve television shutdown in the prior art, standby finger
Show lamp and can not extinguish immediately, it is necessary to continue to extinguish for tens of seconds, so that consumer can not judge whether TV has been switched off,
Have influence on the technical problem of Consumer's Experience.
The embodiment of the present invention provides a kind of control circuit, including：
First rectification module, the second rectification module, isolation module, and standby control module；
The first input end of first rectification module is connected with live wire, the second input is connected with zero line, and described first
The output end connection stand-by circuit of rectification module；
The first input end of second rectification module is connected with live wire, the second input is connected with zero line, and described second
The output end of rectification module is connected by the isolation module with the standby control module；The standby control module is used to control
Make the working condition of the stand-by circuit；
The isolation module is used for when the live wire disconnects, by the ground of second rectification module and the control module
Ground isolation.
It is preferred that also include switch module,
The first input end of first rectification module is connected by the switch module and live wire selection；
The first input end of second rectification module is connected by the switch module and live wire selection.
It is preferred that the isolation module includes isolating device, the isolating device is light isolation device, magnetic coupled isolator
Part or relay isolating device.
It is preferred that the isolation module also includes the divider resistance connected with the isolating device.
It is preferred that first rectification module includes the first rectifier bridge and the first electric capacity；First rectifier bridge with it is described
First electric capacity is in parallel.
It is preferred that second rectification module includes the second rectifier bridge and the second electric capacity；Second rectifier bridge with it is described
Second electric capacity is in parallel.
It is preferred that the isolating device is light isolation device；
The light isolation device includes diode and phototriode, and the anode and negative electrode of the diode form the light
Two inputs of isolating device, the colelctor electrode of the phototriode form the first output end of the light isolation device, institute
The emitter stage for stating phototriode forms the second output end of the light isolation device.
It is preferred that the standby control module includes transistor；
The colelctor electrode of the transistor is connected to power supply by first resistor, and the power supply passes through second resistance and institute
State the first output end connection of isolation module；
The base stage of the transistor is connected with the second output end of the isolation module；
The emitter stage of the transistor is used for the control voltage of stand-by circuit working condition described in output control.
It is preferred that the base stage of the transistor is connected by wave filter with the ground of the control module.
In embodiments of the invention, the first input end of first rectification module is connected with live wire, the second input with
Zero line connects, the output end connection stand-by circuit of first rectification module；The first input end of second rectification module with
Live wire connection, the second input are connected with zero line, the output end of second rectification module by the isolation module with it is described
Standby control module connects；The standby control module is used for the working condition for controlling the stand-by circuit；The isolation module
For when the live wire disconnects, the ground of second rectification module to be isolated with the ground of the control module；The present invention is implemented
By setting isolation module between the second rectification module and control module in example so that the ground of the second rectification module and control mould
The ground of block is isolated, after live wire disconnects, although powered on zero line, due to the ground and standby control module of second rectification module
Ground, which is isolated device, to be isolated, and the second rectification module can not establish loop to export DC level by Y capacitance, and then to treat
The uncontrollable stand-by circuit of machine control module is in running order, therefore, after live wire is disconnected, the standby instruction in stand-by circuit
Lantern festival is extinguished immediately.
Brief description of the drawings
Fig. 1 is complete machine power-supply system schematic diagram in the prior art；
Fig. 2 is a kind of control circuit schematic diagram that the embodiment of the present invention one provides；
Fig. 3 is a kind of control circuit schematic diagram that the embodiment of the present invention two provides.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
One step it is described in detail, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole implementation
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
All other embodiment, belongs to the scope of protection of the invention.
Fig. 2 is a kind of control circuit schematic diagram that the embodiment of the present invention one provides, and the control circuit includes：First rectification mould
Block 101, the second rectification module 102, isolation module 103, standby control module 104；
The first input end of first rectification module 101 is connected with live wire, the second input is connected with zero line, the first rectification mould
The output end connection stand-by circuit of block 101；
The first input end of second rectification module 102 is connected with live wire, the second input is connected with zero line, the second rectification mould
The output end of block 102 is connected by isolation module 103 with standby control module 104；Standby control module 104 is standby for controlling
The working condition of circuit；
Isolation module 103 is used for when the live wire disconnects, by the ground and standby control module of the second rectification module 102
104 ground isolation.
It is preferred that the control circuit also includes switch module；
The first input end of first rectification module 101 is connected by the switch module and live wire selection；
The first input end of second rectification module 102 is connected by the switch module and live wire selection.
Specifically, isolation module 103 includes isolating device, and the isolating device is light isolation device, magnetic coupled isolator
Part or relay isolating device.Linear optical coupling can be selected in light isolation device in the embodiment of the present invention, when input power up signal
When, photophore emits beam, and is radiated on light-receiving device, and light-receiving device turns on after receiving light, produces photoelectric current and is exported from output end,
It is achieved thereby that the conversion of " electrical-optical-electrical ".Common optoelectronic coupler can only transmit data signal (switching signal), be not suitable for passing
Defeated analog signal.Precision photoelectric coupler can transmit the analog voltage or current signal of consecutive variations, so as input is believed
Number strong and weak change can produce corresponding optical signal so that the conducting degree of photistor is also different, the voltage of output or
Electric current is also different therewith.Because photo-coupler has the function that the superior and the subordinate's circuit is completely isolated, do not have an impact mutually, can make
Front and rear end is completely isolated.
It is preferred that isolation module 103 also includes the divider resistance connected with the isolating device, the divider resistance, which rises, to be divided
Pressure acts on, so that the isolating device being capable of normal work.
It is preferred that the first rectification module 101 includes the first rectifier bridge and the first electric capacity；First rectifier bridge and described the
One electric capacity is in parallel.
It is preferred that the second rectification module 102 includes the second rectifier bridge and the second electric capacity；Second rectifier bridge and described the
Two electric capacity are in parallel.
Preferable isolating device is light isolation device in the embodiment of the present invention；The light isolation device includes diode and photoelectricity
Triode, the anode and negative electrode of the diode form two inputs of the light isolation device, the phototriode
Colelctor electrode forms the first output end of the light isolation device, and the emitter stage of the phototriode forms the light isolation device
The second output end.
In the embodiment of the present invention, standby control module 104 includes transistor；The colelctor electrode of the transistor leads to
Cross first resistor and be connected to power supply, and the power supply is connected by second resistance with the first output end of isolation module 103；The crystalline substance
The base stage of body triode is connected with the second output end of isolation module 103；The emitter stage of the transistor, which is used to export, to be controlled
Make the control voltage of the stand-by circuit working condition.
It is preferred that the base stage of the transistor is connected by wave filter with the ground of standby control module 104.
In the embodiment of the present invention, the first rectification module 101 includes the first rectifier bridge and the first electric capacity, the first rectifier bridge and
One electric capacity is in parallel；Second rectification module 102 includes the second rectifier bridge and the second electric capacity, and the second rectifier bridge is in parallel with the second electric capacity.
First rectification module 101 is used to provide operating voltage for stand-by circuit, and the second rectification module 102 exports direct current signal so that standby
Control module 104 produces the control voltage for controlling the stand-by circuit；Wherein, the first electric capacity and the second electric capacity are usually electricity
Electric capacity is solved, to strobe.
In the embodiment of the present invention, standby control module 104 includes transistor；The colelctor electrode of the transistor leads to
Cross first resistor and be connected to power supply, and the power supply is connected by second resistance with the first output end of isolation module 103；The crystalline substance
The base stage of body triode is connected with the second output end of isolation module 103；The emitter stage of the transistor, which is used to export, to be controlled
Make the control voltage of the stand-by circuit working condition；The base stage of the transistor passes through wave filter and the Opportunity awaiting control for linear
The ground connection of module.
By using isolating device between the second rectification module 102 and standby control module 104 in the embodiment of the present invention,
So that the ground and the ground of standby control module 104 of the second rectification module 102 are isolated.After live wire disconnects, still band on zero line
Electricity, but isolated by the ground of the second rectification module 102 is isolated device with the ground of standby control module 104, the second rectification mould
Block can not establish loop to export DC level by Y capacitance, and then cause at the uncontrollable stand-by circuit of standby control module
In working condition, therefore, after live wire is disconnected, the standby indicating lamp in stand-by circuit can be extinguished immediately.
In order to be more clearly understood that the present invention, it is described in detail with reference to specific embodiment.
Fig. 3 is a kind of control circuit schematic diagram that the embodiment of the present invention two provides.
The first rectification module includes the first rectifier bridge VB802 and the first electric capacity C947, the second rectification in the embodiment of the present invention
Module includes the second rectifier bridge VB803 and the second electric capacity C950；As shown in figure 3, ac input end includes live wire input and zero
Line input, ac input end are connected by coil L922 with the second rectifier bridge VB803 and the first rectifier bridge VB802, wherein the
Two rectifier bridge VB803 and the first rectifier bridge VB802 are connected by switching SW with the selection of live wire input respectively.Second electric capacity C950
In parallel with the second rectifier bridge VB803, the first electric capacity C947 is in parallel with the first rectifier bridge VB802, and the first rectification module is used for treat
Electromechanical road provides operating voltage, for example, 300V；Second rectification module exports direct current signal so that the standby control module produces
For controlling the control voltage VDD of the stand-by circuit；Wherein, the first electric capacity C947 and the second electric capacity C950 is electrolysis electricity
Hold, strobe, so that the direct current signal that the first rectifier bridge VB802 and the second rectifier bridge VB803 outputs are stable.
Isolation module includes divider resistance R967, divider resistance R968 and linear optical coupling PC817, standby control module bag
Include divider resistance R969, divider resistance R970, transistor V938 and the filtering being made up of resistance R971 and electric capacity C951
Device；Divider resistance R967, divider resistance R968 play partial pressure, so that linear optical coupling PC817 normal works, linear optical coupling
PC817 plays buffer action, and the ground of the second rectification module is isolated with the ground of standby control module, so that being disconnected in switch SW
In the case of, the second rectification module can not form loop to export direct current by Y capacitance, and the first rectification module can export direct current
And stand-by circuit is supplied to, but due to VDD can not be produced in standby control module, and then cause stand-by circuit to be in the shape that do not work
State, reach the effect that standby indicating lamp is extinguished immediately.
It can be seen from the above：In embodiments of the invention, first input end and the fire of first rectification module
Line connection, the second input are connected with zero line, the output end connection stand-by circuit of first rectification module；Second rectification
The first input end of module is connected with live wire, the second input is connected with zero line, and the output end of second rectification module passes through
The isolation module is connected with the standby control module；The standby control module is used for the work for controlling the stand-by circuit
State；The isolation module is used for when the live wire disconnects, by the ground of second rectification module and the control module
Ground isolates；By setting isolation module between the second rectification module and control module in the embodiment of the present invention so that second is whole
The ground of flow module and the ground of control module are isolated, after live wire disconnects, although powered on zero line, due to the second rectification module
Ground is isolated device with the ground of standby control module to be isolated, and the second rectification module can not establish loop by Y capacitance to export
DC level, and then make it that the uncontrollable stand-by circuit of standby control module is in running order, therefore, after live wire is disconnected,
Standby indicating lamp in stand-by circuit can be extinguished immediately.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (9)
- A kind of 1. control circuit, it is characterised in that including：First rectification module, the second rectification module, isolation module, and treat Machine control module；The first input end of first rectification module is connected with live wire, the second input is connected with zero line, first rectification The output end connection stand-by circuit of module；The first input end of second rectification module is connected with live wire, the second input is connected with zero line, second rectification The output end of module is connected by the isolation module with the standby control module；The standby control module is used to control institute State the working condition of stand-by circuit；The isolation module is used for when the live wire disconnects, by the ground of second rectification module and the ground of the control module Isolation.
- 2. control circuit as claimed in claim 1, it is characterised in that also including switch module,The first input end of first rectification module is connected by the switch module and live wire selection；The first input end of second rectification module is connected by the switch module and live wire selection.
- 3. control circuit as claimed in claim 1, it is characterised in that the isolation module includes isolating device, the isolation Device is light isolation device, magnetic coupled isolator part or relay isolating device.
- 4. control circuit as claimed in claim 3, it is characterised in that the isolation module also includes and the isolating device string The divider resistance of connection.
- 5. control circuit as claimed in claim 1, it is characterised in that first rectification module includes the first rectifier bridge and the One electric capacity；First rectifier bridge is in parallel with first electric capacity.
- 6. control circuit as claimed in claim 1, it is characterised in that second rectification module includes the second rectifier bridge and the Two electric capacity；Second rectifier bridge is in parallel with second electric capacity.
- 7. control circuit as claimed in claim 3, it is characterised in that the isolating device is light isolation device；The light isolation device includes diode and phototriode, and anode and the negative electrode composition of the diode are described optically isolated Two inputs of device, the colelctor electrode of the phototriode form the first output end of the light isolation device, the light The emitter stage of electric triode forms the second output end of the light isolation device.
- 8. control circuit as claimed in claim 7, it is characterised in that the standby control module includes transistor；The colelctor electrode of the transistor is connected to power supply by first resistor, and the power supply by second resistance with it is described every The first output end from module connects；The base stage of the transistor is connected with the second output end of the isolation module；The emitter stage of the transistor is used for the control voltage of stand-by circuit working condition described in output control.
- 9. control circuit as claimed in claim 8, it is characterised in that the base stage of the transistor passes through wave filter and institute State the ground connection of standby control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510043365.7A CN104601911B (en) | 2015-01-28 | 2015-01-28 | A kind of control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510043365.7A CN104601911B (en) | 2015-01-28 | 2015-01-28 | A kind of control circuit |
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| Publication Number | Publication Date |
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| CN104601911A CN104601911A (en) | 2015-05-06 |
| CN104601911B true CN104601911B (en) | 2018-03-27 |
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| CN201510043365.7A Active CN104601911B (en) | 2015-01-28 | 2015-01-28 | A kind of control circuit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105912058B (en) * | 2015-11-16 | 2017-12-29 | 深圳Tcl数字技术有限公司 | Stand-by circuit and electronic equipment |
| CN110891347B (en) * | 2018-09-05 | 2021-09-14 | 华润微集成电路(无锡)有限公司 | Linear LED driving system, linear booster circuit and method |
| CN113685963B (en) * | 2020-05-19 | 2023-08-04 | 海信空调有限公司 | Air conditioner purification control circuit and air conditioner |
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| US5978190A (en) * | 1996-12-24 | 1999-11-02 | Neonics Technology Inc. | Ground fault detector for gas discharge tubing |
| JP2002262556A (en) * | 2002-03-04 | 2002-09-13 | Seiko Epson Corp | Switching power supply |
| CN1979631A (en) * | 2005-11-30 | 2007-06-13 | 瑞轩科技股份有限公司 | Power-supply control circuit of display device |
| CN103326612A (en) * | 2013-06-18 | 2013-09-25 | 中国科学院电工研究所 | Unipolar microsecond pulse high voltage power supply |
| CN203561857U (en) * | 2013-10-29 | 2014-04-23 | 中山市法兰宝电业有限公司 | Low-power standby control system |
| CN103973141A (en) * | 2014-05-30 | 2014-08-06 | 广东志高空调有限公司 | Full-direct-current variable frequency air conditioner supplied with electricity by using switching power supply circuit |
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2015
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5978190A (en) * | 1996-12-24 | 1999-11-02 | Neonics Technology Inc. | Ground fault detector for gas discharge tubing |
| JP2002262556A (en) * | 2002-03-04 | 2002-09-13 | Seiko Epson Corp | Switching power supply |
| CN1979631A (en) * | 2005-11-30 | 2007-06-13 | 瑞轩科技股份有限公司 | Power-supply control circuit of display device |
| CN103326612A (en) * | 2013-06-18 | 2013-09-25 | 中国科学院电工研究所 | Unipolar microsecond pulse high voltage power supply |
| CN203561857U (en) * | 2013-10-29 | 2014-04-23 | 中山市法兰宝电业有限公司 | Low-power standby control system |
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| CN104601911A (en) | 2015-05-06 |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: HISENSE ELECTRIC Co.,Ltd. |