CN204206316U - A kind of restraining device of impulse current of starting shooting and television set - Google Patents
A kind of restraining device of impulse current of starting shooting and television set Download PDFInfo
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- CN204206316U CN204206316U CN201420691188.4U CN201420691188U CN204206316U CN 204206316 U CN204206316 U CN 204206316U CN 201420691188 U CN201420691188 U CN 201420691188U CN 204206316 U CN204206316 U CN 204206316U
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Abstract
The utility model discloses a kind of restraining device and television set of impulse current of starting shooting, restraining device comprises: rectification module, filtration module, suppression module and control module, described rectification module connects filtration module, suppression module and control module, described suppression module connects filtration module and control module, described filtration module link control module.The utility model carries out rectification by the alternating current of rectification module to input, filtration module carries out filtering and output supply voltage to the voltage after rectification, the connection status with suppression module is controlled according to the drive singal of input by control module, suppression module is suppressed the impulse current that alternating current input produces when starting shooting, reduce heating when suppression module is bypassed to solve potential safety hazard and to improve power-efficient by transmission current, its circuit structure is simple, cost is lower.
Description
Technical field
The utility model relates to switch power technology field, particularly a kind of restraining device of impulse current of starting shooting and television set.
Background technology
Surge current is that power supply connects moment, flows into the peak current of power-supply device.Because input filter capacitor charges rapidly, so this peak current is far longer than stable state input current.If surge current exceedes the ability to bear of equipment, the life-span of this equipment can reduce greatly, equipment fault damages even completely.The cumulative effect of multiple little surge can cause performance of semiconductor device to fail.Surge current also can destroy grid supply quality, not only produces serious electromagnetic interference, and can affect other equipment be connected with electrical network.Current LED television power supply suppresses the main employing the following two kinds mode of start impulse current, i.e. surge current.
One, the impulse current based on thermistor suppresses circuit, and the concrete structure of its circuit as shown in Figure 1.The AC(Alternating Current that live wire L and zero line N accesses, alternating current) transfer to rectification in rectifier bridge UR by thermistor TH1, TH2, output supply voltage VCC power supply to the device after input filter capacitor C1 is full of electricity.This circuit mainly contains following shortcoming:
1, thermistor TH1, TH2 is the dead load of this circuit, and after plant-grid connection, thermistor TH1, TH2 consumed energy always, greatly reduces power-efficient.
2, thermistor TH1, TH2 under low pressure generates heat relatively more serious, there is certain potential safety hazard.
3, be meet the requirement suppressing impulse current when power increases, the resistance of thermistor TH1, TH2 is large to strain, and heating is also all the more serious, needs to use multiple thermistor to meet and suppresses to require and reduce heating, can increase cost like this.
Two, the impulse current based on resistance and relay assembly suppresses circuit, and its circuit structure as shown in Figure 2.Compared with the circuit shown in Fig. 1, a thermistor TH1 is only set in Fig. 2, when drive singal (Driver+, Driver-) control relay K closes, thermistor TH1 short circuit; When relay K disconnects, thermistor TH1 accesses between zero line N and rectifier bridge UR.This circuit mainly contains following shortcoming:
1, the relay K increased makes circuit structure complicated, adds cost.
2, the drive current of relay K is comparatively large, need provide special drive circuit.
3, relay K can produce magnetic field thus produce electromagnetic interference.
4, can sound during relay K work.
In view of this, the utility model provides a kind of restraining device and television set of impulse current of starting shooting.
Utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is the restraining device and the television set that provide a kind of impulse current of starting shooting, has with the suppression circuit solving existing start impulse current the problem that efficiency is low, heating is serious and have potential potential safety hazard.
In order to achieve the above object, the utility model takes following technical scheme:
A kind of restraining device of impulse current of starting shooting, it comprises: rectification module, filtration module, suppression module and control module, described rectification module connects filtration module, suppression module and control module, described suppression module connects filtration module and control module, described filtration module link control module;
The alternating current of described rectification module to input carries out rectification, and filtration module is used for carrying out filtering and output supply voltage to the voltage after rectification; Described control module regulates the size of current flowing through described suppression module according to the drive singal of input, when being suppressed to start shooting by suppression module when starting shooting, alternating current inputs the impulse current produced; When suppression module is bypassed by control module transmission current.
In the restraining device of described start impulse current, described control module comprises:
For the driver element of the break-make of the drive singal control switch unit according to input;
For in parallel with suppression module during conducting, suppression module is bypassed, during disconnection and the switch element that disconnects of suppression module;
Described driver element connecting valve unit, rectification module and suppression module, described switch element connects rectification module, suppression module and filtration module.
In the restraining device of described start impulse current, described filtration module comprises the first electric capacity, and the positive pole of described first electric capacity connects the first output and the power output end of rectification module, and the negative pole of the first electric capacity connects suppression module and switch element.
In the restraining device of described start impulse current, described suppression module comprises thermistor, and one end of described thermistor connects negative pole and the switch element of the first electric capacity, and the other end of thermistor connects the second output and the driver element of rectification module.
In the restraining device of described start impulse current, described driver element comprises the first resistance, the second resistance, the second electric capacity and the 3rd electric capacity; One end of described first resistance connects one end of the second output of rectification module, the other end of thermistor and the second electric capacity, the other end of the first resistance connects the other end of the second electric capacity, the positive pole of described 3rd electric capacity connects the other end of the second electric capacity, one end of the second resistance and the control end of switch element, and the negative pole of the 3rd electric capacity connects one end of the second electric capacity and the first transmission ends of switch element.
In the restraining device of described start impulse current, described second electric capacity is ceramic disc capacitor, and the 3rd electric capacity is electrochemical capacitor.
In the restraining device of described start impulse current, described switch element comprises metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor be switch element control end, connect the positive pole of the 3rd electric capacity and one end of the second electric capacity, the source electrode of metal-oxide-semiconductor is the first transmission ends of switch element, the negative pole of connection the 3rd electric capacity, and the drain electrode of metal-oxide-semiconductor connects one end of thermistor, the negative pole of the first electric capacity and ground.
In the restraining device of described start impulse current, the capacitance of described second electric capacity is 0.1uF, and the capacitance of the 3rd electric capacity is 10uF, and the resistance of the first resistance is 10K Ω, and the resistance of the second resistance is 1K Ω.
In the restraining device of described start impulse current, described rectification module comprises the first diode, the second diode, the 3rd diode and the 4th diode; The positive pole of described first diode connects the negative pole of live wire and the second diode, the positive pole of the second diode connects one end of the positive pole of the 3rd diode, the other end of thermistor and the first resistance, the negative pole of the 3rd diode connects positive pole and the zero line of the 4th diode, and the negative pole of the 4th diode connects the positive pole of the negative pole of the first diode, power output end and the first electric capacity.
A kind of television set, it comprises the restraining device of described start impulse current.
Compared to prior art, the restraining device of the start impulse current that the utility model provides and television set, rectification is carried out by the alternating current of rectification module to input, filtration module carries out filtering and output supply voltage to the voltage after rectification, the connection status with suppression module is controlled according to the drive singal of input by control module, suppression module is suppressed the impulse current that alternating current input produces when starting shooting, heating is reduced to solve potential safety hazard when suppression module is bypassed, and improve power-efficient by transmission current, its circuit structure is simple, cost is lower.
Accompanying drawing explanation
Fig. 1 is the circuit diagram suppressing circuit in prior art based on the impulse current of thermistor;
Fig. 2 is the circuit diagram suppressing circuit in prior art based on the impulse current of resistance and relay assembly;
The structured flowchart of the restraining device of the start impulse current that Fig. 3 provides for the utility model embodiment;
The circuit diagram of the restraining device Application Example of the start impulse current that Fig. 4 provides for the utility model embodiment.
Embodiment
The utility model provides a kind of restraining device and television set of impulse current of starting shooting, described restraining device is applicable to all power-supply systems, for making the purpose of this utility model, technical scheme and effect clearly, clearly, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The restraining device of the start impulse current that the utility model provides and television set, the mode adopting resistance and metal-oxide-semiconductor (MOSFET, metal oxide semiconductor field effect tube) to combine is impacted to suppress power supply (particularly the power supply of LED television) to be started shooting; It also improves power supply service efficiency, ensure that grid supply quality while effective surge current suppression, avoids producing serious electromagnetic interference, and can not affect other performances of equipment.Please refer to Fig. 3 and Fig. 4, the restraining device of the start impulse current that the utility model embodiment provides comprises rectification module 100, filtration module 200, suppression module 300 and control module 400; Described rectification module 100 connects filtration module 200, suppression module 300 and control module 400, and described suppression module 300 connects filtration module 200 and control module 400, described filtration module 200 link control module 400.
Described rectification module 100 is to the alternating current AC(AlternatingCurrent of input) carry out rectification, carry out filtering and output supply voltage VCC by the voltage after filtration module 200 pairs of rectifications afterwards, supply voltage VCC powers to whole equipment.Control module 400 controls the connection status with suppression module 300 according to the drive singal of input.When suppression module 300 and control module 400 disconnect, the impulse current that when can suppress to start shooting, alternating current input produces; Suppression module 300 is bypassed time in parallel with control module 400, control module 400 energy transmission current, thus greatly reduces the electric current flowing through suppression module 300, to reduce the heating of suppression module 300, reduces electric energy loss thus improves power-efficient.
In the present embodiment, described control module 400 comprises driver element 401 and switch element 402, described driver element 401 connecting valve unit 402, rectification module 100 and suppression module 300, described switch element 402 connects rectification module 100, suppression module 300 and filtration module 200.As shown in Figure 3, described driver element 401 according to the drive singal Drive control switch cell conduction of input, thus makes switch element in parallel with suppression module; Control switch unit when standby or shutdown, thus switch element and suppression module are disconnected; Be specially: described drive singal Drive is low level when just start, now driver element 401 control switch unit 402 disconnects, makes suppression module 300 upper reaches super-high-current, electric current flows through suppression module 300 pairs of filtration modules 200 and charges, thus restrained effectively start impulse current.Filtration module 200 is full of output supply voltage VCC after electricity, and the master chip of equipment obtains the drive singal Drive that electric work exports and becomes the direct current high level that pressure value is 5V ~ 12V.After driver element 401 receives the drive singal Drive of high level, control switch unit 402 conducting makes suppression module 300 in parallel with switch element 402, thus suppression module 300 is bypassed, such electric current flows through from switch element 402 substantially, electric current is not almost had to flow through in suppression module 300, thus greatly reduce the caloric value of suppression module 300, improve power-efficient.
See also Fig. 4, described rectification module 100 comprises the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4, and it is rectifier diode.The positive pole of described first diode D1 connects the negative pole of live wire L and the second diode D2, the positive pole (i.e. the second output of rectification module) of the second diode D2 connects positive pole and the driver element 401 of the 3rd diode D3, the negative pole connection positive pole of the 4th diode D4 of the 3rd diode D3 and the negative pole (i.e. the first output of rectification module) of zero line N, the 4th diode D4 connect negative pole and the power output end (for output supply voltage VCC) of the first diode D1.After device power, alternating current inputs from live wire L and zero line N, exports to filtration module 200 and charge after the rectifier bridge rectification of above-mentioned four diodes composition.
Described filtration module 200 is capacitive load, and can be understood as is the load of power supply, and it comprises the first electric capacity C1, i.e. input filter capacitor.Described suppression module 300 comprises thermistor TH.The positive pole of described first electric capacity C1 connects negative pole and the power output end of the 4th diode D4, and the negative pole of the first electric capacity C1 connects suppression module 300 and switch element 402.One end of described thermistor TH connects negative pole and the switch element 402 of the first electric capacity C1, and the other end of thermistor TH connects positive pole and the driver element 401 of the second diode D2.
Wherein, described thermistor TH is negative tempperature coefficient thermistor, and belonging to booting moment provides current circuit for capacitive filtering module, to reduce the charging current of the first electric capacity C1, thus inhibits the impulse current of booting moment.If the capacitance of the first electric capacity C1 is comparatively large and the resistance of thermistor TH is less, very large impulse current will be produced.If the resistance of thermistor TH is comparatively large and the capacitance of the first electric capacity C1 is less, impulse current of so starting shooting is less, but the available machine time can be caused elongated.For this reason, the present embodiment is when guaranteeing to suppress impulse current, the resistance of the thermistor TH selected is little as much as possible, then the capacitance of the first electric capacity C1 and the resistance of quick resistance TH meet following relational expression: test the transient current I that booting moment flows through thermistor TH
tH≤ 50A.
In the present embodiment, whether described thermistor TH is in current circuit is controlled by driver element 401 and switch element 402.Described driver element 401 comprises the first resistance R1, the second resistance R2, the second electric capacity C2 and the 3rd electric capacity C3.Described switch element 402 comprises metal-oxide-semiconductor Q1.One end of described first resistance R1 connects one end of the positive pole of the second diode D2, the other end of thermistor TH and the second electric capacity C2, the other end of the first resistance R1 connects the other end of the second electric capacity C2, the positive pole of described 3rd electric capacity C3 connects the other end of the second electric capacity C2, the negative pole of control end the 1, three electric capacity C3 of one end of the second resistance R2 and switch element 402 connects one end of the second electric capacity C2 and the first transmission ends 2 of switch element 402.The grid (i.e. control end 1) of described metal-oxide-semiconductor Q1 connects the positive pole of the 3rd electric capacity C3 and one end of the second electric capacity C2, the source electrode (i.e. the first transmission ends 2) of metal-oxide-semiconductor Q1 connects the negative pole of the 3rd electric capacity C3, and the drain electrode (i.e. the second transmission ends 3) of metal-oxide-semiconductor Q1 connects one end of thermistor TH, the negative pole of the first electric capacity C1 and ground.
Wherein, described second electric capacity C2 is ceramic disc capacitor, the High-frequency Interference in energy filtering circuit.Described 3rd electric capacity C3 is electrochemical capacitor, can ensure the voltage difference between the grid of metal-oxide-semiconductor Q1 and source electrode.Described metal-oxide-semiconductor Q1 is NMOS tube, and its conducting resistance is less, is generally tens milliohms, can facilitate follow-up thermistor TH(to be selected 3 Ω ~ 8 Ω) bypass.
If the resistance of the second resistance R2 is larger, the capacitance of the second electric capacity C2, the 3rd electric capacity C3 is constant, then metal-oxide-semiconductor Q1 grid voltage set up slower, the moment reaching threshold voltage is also more of a specified duration, thus causes the unlatching of metal-oxide-semiconductor Q1 slower.When the value of the second resistance R2 is constant, the capacitance of the second electric capacity C2, the 3rd electric capacity C3 is larger, and the moment that the grid voltage of metal-oxide-semiconductor Q1 reaches threshold voltage is also more of a specified duration, and the unlatching of metal-oxide-semiconductor Q1 also can be caused slack-off.Therefore, the present embodiment needs reasonably to arrange the value of the second electric capacity C2, the 3rd electric capacity C3, the second resistance R2 according to metal-oxide-semiconductor Q1 open-interval, and its type selecting can with reference to following computing formula: the second electric capacity C2 and the 3rd electric capacity C3 charging interval
, wherein U is the voltage (being also driving voltage) charged to the second electric capacity C2 and the 3rd electric capacity C3, and u is the voltage that the second electric capacity C2 and the 3rd electric capacity C3 need to reach, time constant
; Consider that the too fast meeting of the opening time of metal-oxide-semiconductor Q1 causes drive current excessive, and cross can cause slowly opening slack-off, so be typically chosen in 1ms≤
in the scope of≤50ms.C in the present embodiment
2=0.1uF, C
3=10uF, R
2=1K, R
1the value of=10K is better.
When drive singal Drive is low level, metal-oxide-semiconductor Q1 ends (namely disconnecting), and now thermistor TH and the first electric capacity C1, rectifier bridge form current circuit.Electrical network electric energy is charged to the first electric capacity C1 by thermistor TH.When drive singal Drive is high level, described metal-oxide-semiconductor Q1 conducting is in parallel with thermistor TH, jointly for the first electric capacity C1 provides current circuit.Conducting resistance (tens milliohms) due to metal-oxide-semiconductor Q1 is far smaller than thermistor TH(and generally selects 3 Ω ~ 8 Ω), therefore thermistor TH is bypassed, basic no current flows through thermistor TH, and the electric current of whole circuit flows back into power output end basically by metal-oxide-semiconductor Q1.
The utility model is also corresponding provides a kind of television set, comprises the restraining device of above-mentioned start impulse current.Described restraining device is connected with the master chip of television set, and restraining device realizes the suppression of start impulse current according to the drive singal Drive that master chip exports and improves power-efficient.
Please continue to refer to Fig. 4, the present embodiment is television set is example, and the operation principle of the restraining device of described start impulse current is:
After step one, television set power on, electrical network is to the power module input AC electricity of television set.Now television set not yet normally work, namely supply voltage VCC also do not export, master chip is not powered and is not worked, and now drive singal Drive does not also produce.Metal-oxide-semiconductor Q1 disconnects, be equivalent to open circuit.
During step 2, metal-oxide-semiconductor Q1 open circuit, form current circuit between the first electric capacity C1, thermistor TH and rectifier bridge, therefore, electrical network electric energy (i.e. alternating current) charges to the first electric capacity C1 by thermistor TH.
Step 3, the first electric capacity C1 are full of the rear output supply voltage VCC of electricity, for follow-up interlock circuit module provides electric energy, thus make whole power-supply system start normal work.Master chip obtains electric work, exports the drive singal Driver of the high level of 5V ~ 12V.
The drive singal Driver of step 4, high level starts to charge to the second electric capacity C2, the 3rd electric capacity C3 by the second resistance R2.When charging to the first resistance R1 both end voltage and reaching the threshold voltage of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q1 conducting.
Make thermistor TH short circuit after step 5, metal-oxide-semiconductor Q1 conducting, now, on thermistor TH, almost no current flows through, and the electric current of whole circuit is back to power output end by metal-oxide-semiconductor Q1.
After step 6, television set normally work, the voltage stabilization at the second electric capacity C2, the 3rd electric capacity C3 two ends, metal-oxide-semiconductor Q1 is in conducting state always, thus the electric current in circuit is maintained substantially flow through from metal-oxide-semiconductor Q1, until television set performs standby or power-off operation.
After step 7, TV standby or shutdown, the second electric capacity C2, between the 3rd electric capacity C3 and the first resistance R1, form discharge loop, thus make the second electric capacity C2, the 3rd electric capacity C3 both end voltage is 0, causes metal-oxide-semiconductor Q1 to disconnect.
Step 8, restraining device maintain above-mentioned state until when starting shooting next time, return step one and repeat the above-mentioned course of work.
In sum, the restraining device of start impulse current that provides of the utility model and television set have following technique effect:
1, by arranging the value relation of thermistor and the first electric capacity, different resistances being chosen to thermistor, the booting moment impulse current of all kinds equipment can be limited, applied widely.
2, by arranging the value relation of the second electric capacity, the 3rd electric capacity and the second resistance, can set the ON time of metal-oxide-semiconductor according to demand, driving is simplified and cost is low.The driving of metal-oxide-semiconductor is very simple, only need provide the DC level of a 5V ~ 12V, without the need to special drive circuit, improve the reliability of power supply, also optimize cost.
3, can most current be transmitted after metal-oxide-semiconductor conducting, make thermistor short circuit almost no current flow through, generate heat hardly, effective suppress start impulse current while and not by the restriction of power.And thermistor only works at booting moment, consume electric energy hardly again when equipment normally works, avoid thermistor to become dead load and cause excessive loss, thus substantially increase the efficiency of power supply, significantly reduce the caloric value of device, the useful life of extension device.
4, metal-oxide-semiconductor is in conducting state when equipment normally works always, and it can not to spatial emission electromagnetic interference, and switching process does not have noise.
Be understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the utility model.
Claims (10)
1. the restraining device of an impulse current of starting shooting, it is characterized in that, comprise: rectification module, filtration module, suppression module and control module, described rectification module connects filtration module, suppression module and control module, described suppression module connects filtration module and control module, described filtration module link control module;
The alternating current of described rectification module to input carries out rectification, and filtration module is used for carrying out filtering and output supply voltage to the voltage after rectification; Described control module regulates the size of current flowing through described suppression module according to the drive singal of input, when being suppressed to start shooting by suppression module when starting shooting, alternating current inputs the impulse current produced; When suppression module is bypassed by control module transmission current.
2. the restraining device of start impulse current according to claim 1, is characterized in that, described control module comprises:
For the driver element of the break-make of the drive singal control switch unit according to input;
For in parallel with suppression module during conducting, suppression module is bypassed, during disconnection and the switch element that disconnects of suppression module;
Described driver element connecting valve unit, rectification module and suppression module, described switch element connects rectification module, suppression module and filtration module.
3. the restraining device of start impulse current according to claim 2, it is characterized in that, described filtration module comprises the first electric capacity, and the positive pole of described first electric capacity connects the first output and the power output end of rectification module, and the negative pole of the first electric capacity connects suppression module and switch element.
4. the restraining device of start impulse current according to claim 3, it is characterized in that, described suppression module comprises thermistor, and one end of described thermistor connects negative pole and the switch element of the first electric capacity, and the other end of thermistor connects the second output and the driver element of rectification module.
5. the restraining device of start impulse current according to claim 4, is characterized in that, described driver element comprises the first resistance, the second resistance, the second electric capacity and the 3rd electric capacity; One end of described first resistance connects one end of the second output of rectification module, the other end of thermistor and the second electric capacity, the other end of the first resistance connects the other end of the second electric capacity, the positive pole of described 3rd electric capacity connects the other end of the second electric capacity, one end of the second resistance and the control end of switch element, and the negative pole of the 3rd electric capacity connects one end of the second electric capacity and the first transmission ends of switch element.
6. the restraining device of start impulse current according to claim 5, is characterized in that, described second electric capacity is ceramic disc capacitor, and the 3rd electric capacity is electrochemical capacitor.
7. the restraining device of start impulse current according to claim 6, it is characterized in that, described switch element comprises metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor be switch element control end, connect the positive pole of the 3rd electric capacity and one end of the second electric capacity, the source electrode of metal-oxide-semiconductor is the first transmission ends of switch element, the negative pole of connection the 3rd electric capacity, and the drain electrode of metal-oxide-semiconductor connects one end of thermistor, the negative pole of the first electric capacity and ground.
8. the restraining device of start impulse current according to claim 5, is characterized in that, the capacitance of described second electric capacity is 0.1uF, and the capacitance of the 3rd electric capacity is 10uF, and the resistance of the first resistance is 10K Ω, and the resistance of the second resistance is 1K Ω.
9. the restraining device of start impulse current according to claim 5, is characterized in that, described rectification module comprises the first diode, the second diode, the 3rd diode and the 4th diode; The positive pole of described first diode connects the negative pole of live wire and the second diode, the positive pole of the second diode connects one end of the positive pole of the 3rd diode, the other end of thermistor and the first resistance, the negative pole of the 3rd diode connects positive pole and the zero line of the 4th diode, and the negative pole of the 4th diode connects the positive pole of the negative pole of the first diode, power output end and the first electric capacity.
10. a television set, is characterized in that, comprises the restraining device of the start impulse current as described in claim 1-9 any one.
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| CN201420691188.4U CN204206316U (en) | 2014-11-18 | 2014-11-18 | A kind of restraining device of impulse current of starting shooting and television set |
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| CN201420691188.4U CN204206316U (en) | 2014-11-18 | 2014-11-18 | A kind of restraining device of impulse current of starting shooting and television set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107770917A (en) * | 2017-11-21 | 2018-03-06 | 苏州晶品新材料股份有限公司 | Adjustable type LED based on audio signal |
| CN111564961A (en) * | 2020-05-22 | 2020-08-21 | 深圳创维－Rgb电子有限公司 | Inrush current protection switching circuit, switching power supply and television |
-
2014
- 2014-11-18 CN CN201420691188.4U patent/CN204206316U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107770917A (en) * | 2017-11-21 | 2018-03-06 | 苏州晶品新材料股份有限公司 | Adjustable type LED based on audio signal |
| CN111564961A (en) * | 2020-05-22 | 2020-08-21 | 深圳创维－Rgb电子有限公司 | Inrush current protection switching circuit, switching power supply and television |
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Granted publication date: 20150311 Termination date: 20191118 |